Merge branch 'develop'

.github/workflows/check.yml

@@ -15,7 +15,7 @@ jobs:
       - uses: subosito/flutter-action@v1
         with:
           channel: stable
-          flutter-version: '1.22.5'
+          flutter-version: '1.22.6'
 
       - name: Clone the repository.
         uses: actions/checkout@v2

.github/workflows/release.yml

@@ -17,7 +17,7 @@ jobs:
       - uses: subosito/flutter-action@v1
         with:
           channel: stable
-          flutter-version: '1.22.5'
+          flutter-version: '1.22.6'
 
       # Workaround for this Android Gradle Plugin issue (supposedly fixed in AGP 4.1):
       # https://issuetracker.google.com/issues/144111441
@@ -50,8 +50,8 @@ jobs:
           echo "${{ secrets.KEY_JKS }}" > release.keystore.asc
           gpg -d --passphrase "${{ secrets.KEY_JKS_PASSPHRASE }}" --batch release.keystore.asc > $AVES_STORE_FILE
           rm release.keystore.asc
-          flutter build apk --bundle-sksl-path shaders_1.22.5.sksl.json
-          flutter build appbundle --bundle-sksl-path shaders_1.22.5.sksl.json
+          flutter build apk --bundle-sksl-path shaders_1.22.6.sksl.json
+          flutter build appbundle --bundle-sksl-path shaders_1.22.6.sksl.json
           rm $AVES_STORE_FILE
         env:
           AVES_STORE_FILE: ${{ github.workspace }}/key.jks

CHANGELOG.md

@@ -3,6 +3,22 @@ All notable changes to this project will be documented in this file.
 
 ## [Unreleased]
 
+## [v1.3.3] - 2021-01-31
+### Added
+- Viewer: support for multi-track HEIF
+- Viewer: export image (including multipage TIFF/HEIF and images embedded in XMP)
+- Info: show owner app (Android Q and up)
+- listen to Media Store changes
+
+### Changed
+- upgraded Flutter to stable v1.22.6
+- check connectivity before using features that need it
+
+### Fixed
+- checkerboard background performance
+- deleting files that no longer exist but are still registered in the Media Store
+- insets handling on Android 11
+
 ## [v1.3.2] - 2021-01-17
 ### Added
 Collection: identify multipage TIFF & multitrack HEIC/HEIF

README.md

@@ -12,7 +12,7 @@ Aves is a gallery and metadata explorer app. It is built for Android, with Flutt
 
 ## Features
 
-- support raster images: JPEG, GIF, PNG, HEIC (from Android Pie), WEBP, TIFF, BMP, WBMP, ICO
+- support raster images: JPEG, GIF, PNG, HEIC/HEIF (including multi-track, from Android Pie), WEBP, TIFF (including multi-page), BMP, WBMP, ICO
 - support animated images: GIF, WEBP
 - support raw images: ARW, CR2, DNG, NEF, NRW, ORF, PEF, RAF, RW2, SRW
 - support vector images: SVG
@@ -36,10 +36,10 @@ Aves is a gallery and metadata explorer app. It is built for Android, with Flutt
 
 | Model       | Name                       | Android Version | API |
 | ----------- | -------------------------- | --------------- | ---:|
-| SM-G970N    | Samsung Galaxy S10e        | 10 (Android10)  | 29  |
+| SM-G981N    | Samsung Galaxy S20 5G      | 11              | 30  |
+| SM-G970N    | Samsung Galaxy S10e        | 10 (Q)          | 29  |
 | SM-P580     | Samsung Galaxy Tab A 10.1  | 8.1.0 (Oreo)    | 27  |
 | SM-G930S    | Samsung Galaxy S7          | 8.0.0 (Oreo)    | 26  |
-| E5823       | Sony Xperia Z5 Compact     | 7.1.1 (Nougat)  | 25  |
 
 ## Project Setup
 

android/app/build.gradle

@@ -98,15 +98,15 @@ repositories {
 
 dependencies {
     implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-android:1.3.9'
-    implementation 'androidx.core:core-ktx:1.5.0-alpha05' // v1.5.0-alpha02+ for ShortcutManagerCompat.setDynamicShortcuts
+    implementation 'androidx.core:core-ktx:1.5.0-beta01' // v1.5.0-alpha02+ for ShortcutManagerCompat.setDynamicShortcuts
     implementation 'androidx.exifinterface:exifinterface:1.3.2'
     implementation 'com.commonsware.cwac:document:0.4.1'
     implementation 'com.drewnoakes:metadata-extractor:2.15.0'
     implementation 'com.github.deckerst:Android-TiffBitmapFactory:f87db4305d' // forked, built by JitPack
-    implementation 'com.github.bumptech.glide:glide:4.11.0'
+    implementation 'com.github.bumptech.glide:glide:4.12.0'
 
     kapt 'androidx.annotation:annotation:1.1.0'
-    kapt 'com.github.bumptech.glide:compiler:4.11.0'
+    kapt 'com.github.bumptech.glide:compiler:4.12.0'
 
     compileOnly rootProject.findProject(':streams_channel')
 }

android/app/src/main/AndroidManifest.xml

@@ -40,7 +40,6 @@
     <queries>
         <intent>
             <action android:name="android.intent.action.MAIN" />
-            <category android:name="android.intent.category.LAUNCHER" />
         </intent>
     </queries>
 

android/app/src/main/kotlin/deckers/thibault/aves/MainActivity.kt

@@ -16,24 +16,18 @@ import deckers.thibault.aves.utils.LogUtils
 import deckers.thibault.aves.utils.PermissionManager
 import io.flutter.embedding.android.FlutterActivity
 import io.flutter.plugin.common.EventChannel
+import io.flutter.plugin.common.MethodCall
 import io.flutter.plugin.common.MethodChannel
 
 class MainActivity : FlutterActivity() {
-    companion object {
-        private val LOG_TAG = LogUtils.createTag(MainActivity::class.java)
-        const val INTENT_CHANNEL = "deckers.thibault/aves/intent"
-        const val VIEWER_CHANNEL = "deckers.thibault/aves/viewer"
-    }
-
-    private val intentStreamHandler = IntentStreamHandler()
+    private lateinit var contentStreamHandler: ContentChangeStreamHandler
+    private lateinit var intentStreamHandler: IntentStreamHandler
     private lateinit var intentDataMap: MutableMap<String, Any?>
 
     override fun onCreate(savedInstanceState: Bundle?) {
         Log.i(LOG_TAG, "onCreate intent=$intent")
         super.onCreate(savedInstanceState)
 
-        intentDataMap = extractIntentData(intent)
-
         val messenger = flutterEngine!!.dartExecutor.binaryMessenger
 
         MethodChannel(messenger, AppAdapterHandler.CHANNEL).setMethodCallHandler(AppAdapterHandler(this))
@@ -48,59 +42,34 @@ class MainActivity : FlutterActivity() {
         StreamsChannel(messenger, MediaStoreStreamHandler.CHANNEL).setStreamHandlerFactory { args -> MediaStoreStreamHandler(this, args) }
         StreamsChannel(messenger, StorageAccessStreamHandler.CHANNEL).setStreamHandlerFactory { args -> StorageAccessStreamHandler(this, args) }
 
+        // Media Store change monitoring
+        contentStreamHandler = ContentChangeStreamHandler(this).apply {
+            EventChannel(messenger, ContentChangeStreamHandler.CHANNEL).setStreamHandler(this)
+        }
+
+        // intent handling
+        intentStreamHandler = IntentStreamHandler().apply {
+            EventChannel(messenger, IntentStreamHandler.CHANNEL).setStreamHandler(this)
+        }
+        intentDataMap = extractIntentData(intent)
         MethodChannel(messenger, VIEWER_CHANNEL).setMethodCallHandler { call, result ->
             when (call.method) {
                 "getIntentData" -> {
                     result.success(intentDataMap)
                     intentDataMap.clear()
                 }
-                "pick" -> {
-                    val pickedUri = call.argument<String>("uri")
-                    if (pickedUri != null) {
-                        val intent = Intent().apply {
-                            data = Uri.parse(pickedUri)
-                            addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION)
-                        }
-                        setResult(RESULT_OK, intent)
-                    } else {
-                        setResult(RESULT_CANCELED)
-                    }
-                    finish()
-                }
-
+                "pick" -> pick(call)
             }
         }
-        EventChannel(messenger, INTENT_CHANNEL).setStreamHandler(intentStreamHandler)
 
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N_MR1) {
             setupShortcuts()
         }
     }
 
-    @RequiresApi(Build.VERSION_CODES.N_MR1)
-    private fun setupShortcuts() {
-        // do not use 'route' as extra key, as the Flutter framework acts on it
-
-        val search = ShortcutInfoCompat.Builder(this, "search")
-            .setShortLabel(getString(R.string.search_shortcut_short_label))
-            .setIcon(IconCompat.createWithResource(this, R.mipmap.ic_shortcut_search))
-            .setIntent(
-                Intent(Intent.ACTION_MAIN, null, this, MainActivity::class.java)
-                    .putExtra("page", "/search")
-            )
-            .build()
-
-        val videos = ShortcutInfoCompat.Builder(this, "videos")
-            .setShortLabel(getString(R.string.videos_shortcut_short_label))
-            .setIcon(IconCompat.createWithResource(this, R.mipmap.ic_shortcut_movie))
-            .setIntent(
-                Intent(Intent.ACTION_MAIN, null, this, MainActivity::class.java)
-                    .putExtra("page", "/collection")
-                    .putExtra("filters", arrayOf("{\"type\":\"mime\",\"mime\":\"video/*\"}"))
-            )
-            .build()
-
-        ShortcutManagerCompat.setDynamicShortcuts(this, listOf(videos, search))
+    override fun onDestroy() {
+        contentStreamHandler.dispose()
+        super.onDestroy()
     }
 
     override fun onNewIntent(intent: Intent) {
@@ -109,6 +78,25 @@ class MainActivity : FlutterActivity() {
         intentStreamHandler.notifyNewIntent(extractIntentData(intent))
     }
 
+    override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
+        if (requestCode == PermissionManager.VOLUME_ACCESS_REQUEST_CODE) {
+            val treeUri = data?.data
+            if (resultCode != RESULT_OK || treeUri == null) {
+                PermissionManager.onPermissionResult(requestCode, null)
+                return
+            }
+
+            // save access permissions across reboots
+            val takeFlags = (data.flags
+                    and (Intent.FLAG_GRANT_READ_URI_PERMISSION
+                    or Intent.FLAG_GRANT_WRITE_URI_PERMISSION))
+            contentResolver.takePersistableUriPermission(treeUri, takeFlags)
+
+            // resume pending action
+            PermissionManager.onPermissionResult(requestCode, treeUri)
+        }
+    }
+
     private fun extractIntentData(intent: Intent?): MutableMap<String, Any?> {
         when (intent?.action) {
             Intent.ACTION_MAIN -> {
@@ -138,22 +126,48 @@ class MainActivity : FlutterActivity() {
         return HashMap()
     }
 
-    override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
-        if (requestCode == PermissionManager.VOLUME_ACCESS_REQUEST_CODE) {
-            val treeUri = data?.data
-            if (resultCode != RESULT_OK || treeUri == null) {
-                PermissionManager.onPermissionResult(requestCode, null)
-                return
+    private fun pick(call: MethodCall) {
+        val pickedUri = call.argument<String>("uri")
+        if (pickedUri != null) {
+            val intent = Intent().apply {
+                data = Uri.parse(pickedUri)
+                addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION)
+            }
+            setResult(RESULT_OK, intent)
+        } else {
+            setResult(RESULT_CANCELED)
+        }
+        finish()
     }
 
-            // save access permissions across reboots
-            val takeFlags = (data.flags
-                    and (Intent.FLAG_GRANT_READ_URI_PERMISSION
-                    or Intent.FLAG_GRANT_WRITE_URI_PERMISSION))
-            contentResolver.takePersistableUriPermission(treeUri, takeFlags)
+    @RequiresApi(Build.VERSION_CODES.N_MR1)
+    private fun setupShortcuts() {
+        // do not use 'route' as extra key, as the Flutter framework acts on it
 
-            // resume pending action
-            PermissionManager.onPermissionResult(requestCode, treeUri)
+        val search = ShortcutInfoCompat.Builder(this, "search")
+            .setShortLabel(getString(R.string.search_shortcut_short_label))
+            .setIcon(IconCompat.createWithResource(this, R.mipmap.ic_shortcut_search))
+            .setIntent(
+                Intent(Intent.ACTION_MAIN, null, this, MainActivity::class.java)
+                    .putExtra("page", "/search")
+            )
+            .build()
+
+        val videos = ShortcutInfoCompat.Builder(this, "videos")
+            .setShortLabel(getString(R.string.videos_shortcut_short_label))
+            .setIcon(IconCompat.createWithResource(this, R.mipmap.ic_shortcut_movie))
+            .setIntent(
+                Intent(Intent.ACTION_MAIN, null, this, MainActivity::class.java)
+                    .putExtra("page", "/collection")
+                    .putExtra("filters", arrayOf("{\"type\":\"mime\",\"mime\":\"video/*\"}"))
+            )
+            .build()
+
+        ShortcutManagerCompat.setDynamicShortcuts(this, listOf(videos, search))
     }
+
+    companion object {
+        private val LOG_TAG = LogUtils.createTag(MainActivity::class.java)
+        const val VIEWER_CHANNEL = "deckers.thibault/aves/viewer"
     }
 }

android/app/src/main/kotlin/deckers/thibault/aves/channel/calls/AppAdapterHandler.kt

@@ -12,6 +12,8 @@ import androidx.core.content.FileProvider
 import com.bumptech.glide.Glide
 import com.bumptech.glide.load.DecodeFormat
 import com.bumptech.glide.request.RequestOptions
+import deckers.thibault.aves.channel.calls.Coresult.Companion.safe
+import deckers.thibault.aves.model.FieldMap
 import deckers.thibault.aves.utils.BitmapUtils.getBytes
 import deckers.thibault.aves.utils.LogUtils
 import io.flutter.plugin.common.MethodCall
@@ -28,8 +30,8 @@ import kotlin.math.roundToInt
 class AppAdapterHandler(private val context: Context) : MethodCallHandler {
     override fun onMethodCall(call: MethodCall, result: MethodChannel.Result) {
         when (call.method) {
-            "getAppIcon" -> GlobalScope.launch(Dispatchers.IO) { getAppIcon(call, Coresult(result)) }
-            "getAppNames" -> GlobalScope.launch(Dispatchers.IO) { getAppNames(Coresult(result)) }
+            "getPackages" -> GlobalScope.launch(Dispatchers.IO) { safe(call, result, ::getPackages) }
+            "getAppIcon" -> GlobalScope.launch(Dispatchers.IO) { safe(call, result, ::getAppIcon) }
             "edit" -> {
                 val title = call.argument<String>("title")
                 val uri = call.argument<String>("uri")?.let { Uri.parse(it) }
@@ -61,30 +63,24 @@ class AppAdapterHandler(private val context: Context) : MethodCallHandler {
         }
     }
 
-    private fun getAppNames(result: MethodChannel.Result) {
-        val nameMap = HashMap<String, String>()
-        val intent = Intent(Intent.ACTION_MAIN, null)
-            .addCategory(Intent.CATEGORY_LAUNCHER)
-            .setFlags(Intent.FLAG_ACTIVITY_NEW_TASK or Intent.FLAG_ACTIVITY_RESET_TASK_IF_NEEDED)
+    private fun getPackages(@Suppress("UNUSED_PARAMETER") call: MethodCall, result: MethodChannel.Result) {
+        val packages = HashMap<String, FieldMap>()
 
+        fun addPackageDetails(intent: Intent) {
             // apps tend to use their name in English when creating folders
             // so we get their names in English as well as the current locale
             val englishConfig = Configuration().apply { setLocale(Locale.ENGLISH) }
 
             val pm = context.packageManager
             for (resolveInfo in pm.queryIntentActivities(intent, 0)) {
-            val ai = resolveInfo.activityInfo.applicationInfo
-            val isSystemPackage = ai.flags and ApplicationInfo.FLAG_SYSTEM != 0
-            if (!isSystemPackage) {
-                val packageName = ai.packageName
-
-                val currentLabel = pm.getApplicationLabel(ai).toString()
-                nameMap[currentLabel] = packageName
-
-                val labelRes = ai.labelRes
-                if (labelRes != 0) {
+                val appInfo = resolveInfo.activityInfo.applicationInfo
+                val packageName = appInfo.packageName
+                if (!packages.containsKey(packageName)) {
+                    val currentLabel = pm.getApplicationLabel(appInfo).toString()
+                    val englishLabel: String? = appInfo.labelRes.takeIf { it != 0 }?.let { labelRes ->
+                        var englishLabel: String? = null
                         try {
-                        val resources = pm.getResourcesForApplication(ai)
+                            val resources = pm.getResourcesForApplication(appInfo)
                             // `updateConfiguration` is deprecated but it seems to be the only way
                             // to query resources from another app with a specific locale.
                             // The following methods do not work:
@@ -92,15 +88,26 @@ class AppAdapterHandler(private val context: Context) : MethodCallHandler {
                             // - getting a package manager from a custom context with `context.createConfigurationContext(config)`
                             @Suppress("DEPRECATION")
                             resources.updateConfiguration(englishConfig, resources.displayMetrics)
-                        val englishLabel = resources.getString(labelRes)
-                        nameMap[englishLabel] = packageName
+                            englishLabel = resources.getString(labelRes)
                         } catch (e: PackageManager.NameNotFoundException) {
                             Log.w(LOG_TAG, "failed to get app label in English for packageName=$packageName", e)
                         }
+                        englishLabel
+                    }
+                    packages[packageName] = hashMapOf(
+                        "packageName" to packageName,
+                        "categoryLauncher" to intent.hasCategory(Intent.CATEGORY_LAUNCHER),
+                        "isSystem" to (appInfo.flags and ApplicationInfo.FLAG_SYSTEM != 0),
+                        "currentLabel" to currentLabel,
+                        "englishLabel" to englishLabel,
+                    )
                 }
             }
         }
-        result.success(nameMap)
+
+        addPackageDetails(Intent(Intent.ACTION_MAIN).addCategory(Intent.CATEGORY_LAUNCHER))
+        addPackageDetails(Intent(Intent.ACTION_MAIN))
+        result.success(ArrayList(packages.values))
     }
 
     private fun getAppIcon(call: MethodCall, result: MethodChannel.Result) {

android/app/src/main/kotlin/deckers/thibault/aves/channel/calls/Coresult.kt

@@ -1,9 +1,11 @@
 package deckers.thibault.aves.channel.calls
 
+import io.flutter.plugin.common.MethodCall
 import io.flutter.plugin.common.MethodChannel
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.launch
+import kotlin.reflect.KSuspendFunction2
 
 // ensure `result` methods are called on the main looper thread
 class Coresult internal constructor(private val methodResult: MethodChannel.Result) : MethodChannel.Result {
@@ -20,4 +22,24 @@ class Coresult internal constructor(private val methodResult: MethodChannel.Resu
     override fun notImplemented() {
         mainScope.launch { methodResult.notImplemented() }
     }
+
+    companion object {
+        fun safe(call: MethodCall, result: MethodChannel.Result, function: (call: MethodCall, result: MethodChannel.Result) -> Unit) {
+            val res = Coresult(result)
+            try {
+                function(call, res)
+            } catch (e: Exception) {
+                res.error("safe-exception", e.message, e.stackTraceToString())
+            }
+        }
+
+        suspend fun safesus(call: MethodCall, result: MethodChannel.Result, function: KSuspendFunction2<MethodCall, MethodChannel.Result, Unit>) {
+            val res = Coresult(result)
+            try {
+                function(call, res)
+            } catch (e: Exception) {
+                res.error("safe-exception", e.message, e.stackTraceToString())
+            }
+        }
+    }
 }

android/app/src/main/kotlin/deckers/thibault/aves/channel/calls/DebugHandler.kt

@@ -12,10 +12,11 @@ import android.util.Log
 import androidx.exifinterface.media.ExifInterface
 import com.drew.imaging.ImageMetadataReader
 import com.drew.metadata.file.FileTypeDirectory
+import deckers.thibault.aves.channel.calls.Coresult.Companion.safe
 import deckers.thibault.aves.metadata.ExifInterfaceHelper
 import deckers.thibault.aves.metadata.MediaMetadataRetrieverHelper
 import deckers.thibault.aves.metadata.Metadata
-import deckers.thibault.aves.model.provider.FieldMap
+import deckers.thibault.aves.model.FieldMap
 import deckers.thibault.aves.utils.LogUtils
 import deckers.thibault.aves.utils.MimeTypes.isImage
 import deckers.thibault.aves.utils.MimeTypes.isSupportedByExifInterface
@@ -37,12 +38,12 @@ class DebugHandler(private val context: Context) : MethodCallHandler {
         when (call.method) {
             "getContextDirs" -> result.success(getContextDirs())
             "getEnv" -> result.success(System.getenv())
-            "getBitmapFactoryInfo" -> GlobalScope.launch(Dispatchers.IO) { getBitmapFactoryInfo(call, Coresult(result)) }
-            "getContentResolverMetadata" -> GlobalScope.launch(Dispatchers.IO) { getContentResolverMetadata(call, Coresult(result)) }
-            "getExifInterfaceMetadata" -> GlobalScope.launch(Dispatchers.IO) { getExifInterfaceMetadata(call, Coresult(result)) }
-            "getMediaMetadataRetrieverMetadata" -> GlobalScope.launch(Dispatchers.IO) { getMediaMetadataRetrieverMetadata(call, Coresult(result)) }
-            "getMetadataExtractorSummary" -> GlobalScope.launch(Dispatchers.IO) { getMetadataExtractorSummary(call, Coresult(result)) }
-            "getTiffStructure" -> GlobalScope.launch(Dispatchers.IO) { getTiffStructure(call, Coresult(result)) }
+            "getBitmapFactoryInfo" -> GlobalScope.launch(Dispatchers.IO) { safe(call, result, ::getBitmapFactoryInfo) }
+            "getContentResolverMetadata" -> GlobalScope.launch(Dispatchers.IO) { safe(call, result, ::getContentResolverMetadata) }
+            "getExifInterfaceMetadata" -> GlobalScope.launch(Dispatchers.IO) { safe(call, result, ::getExifInterfaceMetadata) }
+            "getMediaMetadataRetrieverMetadata" -> GlobalScope.launch(Dispatchers.IO) { safe(call, result, ::getMediaMetadataRetrieverMetadata) }
+            "getMetadataExtractorSummary" -> GlobalScope.launch(Dispatchers.IO) { safe(call, result, ::getMetadataExtractorSummary) }
+            "getTiffStructure" -> GlobalScope.launch(Dispatchers.IO) { safe(call, result, ::getTiffStructure) }
             else -> result.notImplemented()
         }
     }

android/app/src/main/kotlin/deckers/thibault/aves/channel/calls/ImageFileHandler.kt

@@ -5,8 +5,13 @@ import android.graphics.Rect
 import android.net.Uri
 import android.util.Size
 import com.bumptech.glide.Glide
+import deckers.thibault.aves.channel.calls.Coresult.Companion.safe
+import deckers.thibault.aves.channel.calls.Coresult.Companion.safesus
+import deckers.thibault.aves.channel.calls.fetchers.RegionFetcher
+import deckers.thibault.aves.channel.calls.fetchers.ThumbnailFetcher
+import deckers.thibault.aves.channel.calls.fetchers.TiffRegionFetcher
 import deckers.thibault.aves.model.ExifOrientationOp
-import deckers.thibault.aves.model.provider.FieldMap
+import deckers.thibault.aves.model.FieldMap
 import deckers.thibault.aves.model.provider.ImageProvider.ImageOpCallback
 import deckers.thibault.aves.model.provider.ImageProviderFactory.getProvider
 import deckers.thibault.aves.model.provider.MediaStoreImageProvider
@@ -26,17 +31,14 @@ class ImageFileHandler(private val activity: Activity) : MethodCallHandler {
 
     override fun onMethodCall(call: MethodCall, result: MethodChannel.Result) {
         when (call.method) {
-            "getObsoleteEntries" -> GlobalScope.launch(Dispatchers.IO) { getObsoleteEntries(call, Coresult(result)) }
-            "getImageEntry" -> GlobalScope.launch(Dispatchers.IO) { getImageEntry(call, Coresult(result)) }
-            "getThumbnail" -> GlobalScope.launch(Dispatchers.IO) { getThumbnail(call, Coresult(result)) }
-            "getRegion" -> GlobalScope.launch(Dispatchers.IO) { getRegion(call, Coresult(result)) }
-            "clearSizedThumbnailDiskCache" -> {
-                GlobalScope.launch(Dispatchers.IO) { Glide.get(activity).clearDiskCache() }
-                result.success(null)
-            }
-            "rename" -> GlobalScope.launch(Dispatchers.IO) { rename(call, Coresult(result)) }
-            "rotate" -> GlobalScope.launch(Dispatchers.IO) { rotate(call, Coresult(result)) }
-            "flip" -> GlobalScope.launch(Dispatchers.IO) { flip(call, Coresult(result)) }
+            "getObsoleteEntries" -> GlobalScope.launch(Dispatchers.IO) { safe(call, result, ::getObsoleteEntries) }
+            "getEntry" -> GlobalScope.launch(Dispatchers.IO) { safesus(call, result, ::getEntry) }
+            "getThumbnail" -> GlobalScope.launch(Dispatchers.IO) { safe(call, result, ::getThumbnail) }
+            "getRegion" -> GlobalScope.launch(Dispatchers.IO) { safe(call, result, ::getRegion) }
+            "clearSizedThumbnailDiskCache" -> GlobalScope.launch(Dispatchers.IO) { safe(call, result, ::clearSizedThumbnailDiskCache) }
+            "rename" -> GlobalScope.launch(Dispatchers.IO) { safesus(call, result, ::rename) }
+            "rotate" -> GlobalScope.launch(Dispatchers.IO) { safe(call, result, ::rotate) }
+            "flip" -> GlobalScope.launch(Dispatchers.IO) { safe(call, result, ::flip) }
             else -> result.notImplemented()
         }
     }
@@ -58,7 +60,7 @@ class ImageFileHandler(private val activity: Activity) : MethodCallHandler {
         val isFlipped = call.argument<Boolean>("isFlipped")
         val widthDip = call.argument<Double>("widthDip")
         val heightDip = call.argument<Double>("heightDip")
-        val page = call.argument<Int>("page")
+        val pageId = call.argument<Int>("pageId")
         val defaultSizeDip = call.argument<Double>("defaultSizeDip")
 
         if (uri == null || mimeType == null || dateModifiedSecs == null || rotationDegrees == null || isFlipped == null || widthDip == null || heightDip == null || defaultSizeDip == null) {
@@ -76,7 +78,7 @@ class ImageFileHandler(private val activity: Activity) : MethodCallHandler {
             isFlipped,
             width = (widthDip * density).roundToInt(),
             height = (heightDip * density).roundToInt(),
-            page = page,
+            pageId = pageId,
             defaultSize = (defaultSizeDip * density).roundToInt(),
             result,
         ).fetch()
@@ -85,7 +87,7 @@ class ImageFileHandler(private val activity: Activity) : MethodCallHandler {
     private fun getRegion(call: MethodCall, result: MethodChannel.Result) {
         val uri = call.argument<String>("uri")?.let { Uri.parse(it) }
         val mimeType = call.argument<String>("mimeType")
-        val page = call.argument<Int>("page")
+        val pageId = call.argument<Int>("pageId")
         val sampleSize = call.argument<Int>("sampleSize")
         val x = call.argument<Int>("regionX")
         val y = call.argument<Int>("regionY")
@@ -102,43 +104,49 @@ class ImageFileHandler(private val activity: Activity) : MethodCallHandler {
         val regionRect = Rect(x, y, x + width, y + height)
         when (mimeType) {
             MimeTypes.TIFF -> TiffRegionFetcher(activity).fetch(
-                uri,
-                sampleSize,
-                regionRect,
-                page = page ?: 0,
-                result,
+                uri = uri,
+                page = pageId ?: 0,
+                sampleSize = sampleSize,
+                regionRect = regionRect,
+                result = result,
             )
             else -> regionFetcher.fetch(
-                uri,
-                mimeType,
-                sampleSize,
-                regionRect,
-                Size(imageWidth, imageHeight),
-                result,
+                uri = uri,
+                mimeType = mimeType,
+                pageId = pageId,
+                sampleSize = sampleSize,
+                regionRect = regionRect,
+                imageSize = Size(imageWidth, imageHeight),
+                result = result,
             )
         }
     }
 
-    private suspend fun getImageEntry(call: MethodCall, result: MethodChannel.Result) {
+    private suspend fun getEntry(call: MethodCall, result: MethodChannel.Result) {
         val mimeType = call.argument<String>("mimeType") // MIME type is optional
         val uri = call.argument<String>("uri")?.let { Uri.parse(it) }
         if (uri == null) {
-            result.error("getImageEntry-args", "failed because of missing arguments", null)
+            result.error("getEntry-args", "failed because of missing arguments", null)
             return
         }
 
         val provider = getProvider(uri)
         if (provider == null) {
-            result.error("getImageEntry-provider", "failed to find provider for uri=$uri", null)
+            result.error("getEntry-provider", "failed to find provider for uri=$uri", null)
             return
         }
 
         provider.fetchSingle(activity, uri, mimeType, object : ImageOpCallback {
             override fun onSuccess(fields: FieldMap) = result.success(fields)
-            override fun onFailure(throwable: Throwable) = result.error("getImageEntry-failure", "failed to get entry for uri=$uri", throwable.message)
+            override fun onFailure(throwable: Throwable) = result.error("getEntry-failure", "failed to get entry for uri=$uri", throwable.message)
         })
     }
 
+    private fun clearSizedThumbnailDiskCache(@Suppress("UNUSED_PARAMETER") call: MethodCall, result: MethodChannel.Result) {
+        Glide.get(activity).clearDiskCache()
+        result.success(null)
+    }
+
     private suspend fun rename(call: MethodCall, result: MethodChannel.Result) {
         val entryMap = call.argument<FieldMap>("entry")
         val newName = call.argument<String>("newName")

android/app/src/main/kotlin/deckers/thibault/aves/channel/calls/MetadataHandler.kt

@@ -1,8 +1,15 @@
 package deckers.thibault.aves.channel.calls
 
+import android.content.ContentResolver
+import android.content.ContentUris
 import android.content.Context
+import android.database.Cursor
+import android.media.MediaExtractor
+import android.media.MediaFormat
 import android.media.MediaMetadataRetriever
 import android.net.Uri
+import android.os.Build
+import android.provider.MediaStore
 import android.util.Log
 import androidx.exifinterface.media.ExifInterface
 import com.adobe.internal.xmp.XMPException
@@ -18,6 +25,7 @@ import com.drew.metadata.iptc.IptcDirectory
 import com.drew.metadata.mp4.media.Mp4UuidBoxDirectory
 import com.drew.metadata.webp.WebpDirectory
 import com.drew.metadata.xmp.XmpDirectory
+import deckers.thibault.aves.channel.calls.Coresult.Companion.safe
 import deckers.thibault.aves.metadata.*
 import deckers.thibault.aves.metadata.ExifInterfaceHelper.describeAll
 import deckers.thibault.aves.metadata.ExifInterfaceHelper.getSafeDateMillis
@@ -38,13 +46,14 @@ import deckers.thibault.aves.metadata.MetadataExtractorHelper.isGeoTiff
 import deckers.thibault.aves.metadata.XMP.getSafeDateMillis
 import deckers.thibault.aves.metadata.XMP.getSafeLocalizedText
 import deckers.thibault.aves.metadata.XMP.isPanorama
-import deckers.thibault.aves.model.provider.FieldMap
+import deckers.thibault.aves.model.FieldMap
 import deckers.thibault.aves.model.provider.FileImageProvider
 import deckers.thibault.aves.model.provider.ImageProvider
 import deckers.thibault.aves.utils.BitmapUtils
 import deckers.thibault.aves.utils.BitmapUtils.getBytes
 import deckers.thibault.aves.utils.LogUtils
 import deckers.thibault.aves.utils.MimeTypes
+import deckers.thibault.aves.utils.MimeTypes.isHeifLike
 import deckers.thibault.aves.utils.MimeTypes.isImage
 import deckers.thibault.aves.utils.MimeTypes.isMultimedia
 import deckers.thibault.aves.utils.MimeTypes.isSupportedByExifInterface
@@ -66,14 +75,15 @@ import kotlin.math.roundToLong
 class MetadataHandler(private val context: Context) : MethodCallHandler {
     override fun onMethodCall(call: MethodCall, result: MethodChannel.Result) {
         when (call.method) {
-            "getAllMetadata" -> GlobalScope.launch(Dispatchers.IO) { getAllMetadata(call, Coresult(result)) }
-            "getCatalogMetadata" -> GlobalScope.launch(Dispatchers.IO) { getCatalogMetadata(call, Coresult(result)) }
-            "getOverlayMetadata" -> GlobalScope.launch(Dispatchers.IO) { getOverlayMetadata(call, Coresult(result)) }
-            "getMultiPageInfo" -> GlobalScope.launch(Dispatchers.IO) { getMultiPageInfo(call, Coresult(result)) }
-            "getPanoramaInfo" -> GlobalScope.launch(Dispatchers.IO) { getPanoramaInfo(call, Coresult(result)) }
-            "getEmbeddedPictures" -> GlobalScope.launch(Dispatchers.IO) { getEmbeddedPictures(call, Coresult(result)) }
-            "getExifThumbnails" -> GlobalScope.launch(Dispatchers.IO) { getExifThumbnails(call, Coresult(result)) }
-            "extractXmpDataProp" -> GlobalScope.launch(Dispatchers.IO) { extractXmpDataProp(call, Coresult(result)) }
+            "getAllMetadata" -> GlobalScope.launch(Dispatchers.IO) { safe(call, result, ::getAllMetadata) }
+            "getCatalogMetadata" -> GlobalScope.launch(Dispatchers.IO) { safe(call, result, ::getCatalogMetadata) }
+            "getOverlayMetadata" -> GlobalScope.launch(Dispatchers.IO) { safe(call, result, ::getOverlayMetadata) }
+            "getMultiPageInfo" -> GlobalScope.launch(Dispatchers.IO) { safe(call, result, ::getMultiPageInfo) }
+            "getPanoramaInfo" -> GlobalScope.launch(Dispatchers.IO) { safe(call, result, ::getPanoramaInfo) }
+            "getContentResolverProp" -> GlobalScope.launch(Dispatchers.IO) { safe(call, result, ::getContentResolverProp) }
+            "getEmbeddedPictures" -> GlobalScope.launch(Dispatchers.IO) { safe(call, result, ::getEmbeddedPictures) }
+            "getExifThumbnails" -> GlobalScope.launch(Dispatchers.IO) { safe(call, result, ::getExifThumbnails) }
+            "extractXmpDataProp" -> GlobalScope.launch(Dispatchers.IO) { safe(call, result, ::extractXmpDataProp) }
             else -> result.notImplemented()
         }
     }
@@ -430,7 +440,7 @@ class MetadataHandler(private val context: Context) : MethodCallHandler {
                 }
             }
 
-            if (mimeType == MimeTypes.HEIC || mimeType == MimeTypes.HEIF) {
+            if (isHeifLike(mimeType)) {
                 retriever.getSafeInt(MediaMetadataRetriever.METADATA_KEY_NUM_TRACKS) {
                     if (it > 1) flags = flags or MASK_IS_MULTIPAGE
                 }
@@ -521,21 +531,57 @@ class MetadataHandler(private val context: Context) : MethodCallHandler {
             return
         }
 
-        val pages = HashMap<Int, Any>()
+        val pages = ArrayList<Map<String, Any>>()
         if (mimeType == MimeTypes.TIFF) {
-            fun toMap(options: TiffBitmapFactory.Options): Map<String, Any> {
+            fun toMap(page: Int, options: TiffBitmapFactory.Options): HashMap<String, Any> {
                 return hashMapOf(
-                    "width" to options.outWidth,
-                    "height" to options.outHeight,
+                    KEY_PAGE to page,
+                    KEY_MIME_TYPE to mimeType,
+                    KEY_WIDTH to options.outWidth,
+                    KEY_HEIGHT to options.outHeight,
                 )
             }
             getTiffPageInfo(uri, 0)?.let { first ->
-                pages[0] = toMap(first)
+                pages.add(toMap(0, first))
                 val pageCount = first.outDirectoryCount
                 for (i in 1 until pageCount) {
-                    getTiffPageInfo(uri, i)?.let { pages[i] = toMap(it) }
+                    getTiffPageInfo(uri, i)?.let { pages.add(toMap(i, it)) }
                 }
             }
+        } else if (isHeifLike(mimeType)) {
+            fun MediaFormat.getSafeInt(key: String, save: (value: Int) -> Unit) {
+                if (this.containsKey(key)) save(this.getInteger(key))
+            }
+
+            fun MediaFormat.getSafeLong(key: String, save: (value: Long) -> Unit) {
+                if (this.containsKey(key)) save(this.getLong(key))
+            }
+
+            val extractor = MediaExtractor()
+            extractor.setDataSource(context, uri, null)
+            for (i in 0 until extractor.trackCount) {
+                try {
+                    val format = extractor.getTrackFormat(i)
+                    format.getString(MediaFormat.KEY_MIME)?.let { mime ->
+                        val trackMime = if (mime == MediaFormat.MIMETYPE_IMAGE_ANDROID_HEIC) MimeTypes.HEIC else mime
+                        val page = hashMapOf<String, Any>(
+                            KEY_PAGE to i,
+                            KEY_MIME_TYPE to trackMime,
+                        )
+                        format.getSafeInt(MediaFormat.KEY_IS_DEFAULT) { page[KEY_IS_DEFAULT] = it != 0 }
+                        format.getSafeInt(MediaFormat.KEY_TRACK_ID) { page[KEY_TRACK_ID] = it }
+                        format.getSafeInt(MediaFormat.KEY_WIDTH) { page[KEY_WIDTH] = it }
+                        format.getSafeInt(MediaFormat.KEY_HEIGHT) { page[KEY_HEIGHT] = it }
+                        if (isVideo(trackMime)) {
+                            format.getSafeLong(MediaFormat.KEY_DURATION) { page[KEY_DURATION] = it / 1000 }
+                        }
+                        pages.add(page)
+                    }
+                } catch (e: Exception) {
+                    Log.w(LOG_TAG, "failed to get track information for uri=$uri, track num=$i", e)
+                }
+            }
+            extractor.release()
         }
         result.success(pages)
     }
@@ -555,14 +601,16 @@ class MetadataHandler(private val context: Context) : MethodCallHandler {
                     val metadata = ImageMetadataReader.readMetadata(input)
                     val xmpDirs = metadata.getDirectoriesOfType(XmpDirectory::class.java)
                     try {
-                        fun getProp(propName: String): Int? = xmpDirs.map { it.xmpMeta.getPropertyInteger(XMP.GPANO_SCHEMA_NS, propName) }.firstOrNull { it != null }
+                        fun getIntProp(propName: String): Int? = xmpDirs.map { it.xmpMeta.getPropertyInteger(XMP.GPANO_SCHEMA_NS, propName) }.firstOrNull { it != null }
+                        fun getStringProp(propName: String): String? = xmpDirs.map { it.xmpMeta.getPropertyString(XMP.GPANO_SCHEMA_NS, propName) }.firstOrNull { it != null }
                         val fields: FieldMap = hashMapOf(
-                            "croppedAreaLeft" to getProp(XMP.GPANO_CROPPED_AREA_LEFT_PROP_NAME),
-                            "croppedAreaTop" to getProp(XMP.GPANO_CROPPED_AREA_TOP_PROP_NAME),
-                            "croppedAreaWidth" to getProp(XMP.GPANO_CROPPED_AREA_WIDTH_PROP_NAME),
-                            "croppedAreaHeight" to getProp(XMP.GPANO_CROPPED_AREA_HEIGHT_PROP_NAME),
-                            "fullPanoWidth" to getProp(XMP.GPANO_FULL_PANO_WIDTH_PROP_NAME),
-                            "fullPanoHeight" to getProp(XMP.GPANO_FULL_PANO_HEIGHT_PROP_NAME),
+                            "croppedAreaLeft" to getIntProp(XMP.GPANO_CROPPED_AREA_LEFT_PROP_NAME),
+                            "croppedAreaTop" to getIntProp(XMP.GPANO_CROPPED_AREA_TOP_PROP_NAME),
+                            "croppedAreaWidth" to getIntProp(XMP.GPANO_CROPPED_AREA_WIDTH_PROP_NAME),
+                            "croppedAreaHeight" to getIntProp(XMP.GPANO_CROPPED_AREA_HEIGHT_PROP_NAME),
+                            "fullPanoWidth" to getIntProp(XMP.GPANO_FULL_PANO_WIDTH_PROP_NAME),
+                            "fullPanoHeight" to getIntProp(XMP.GPANO_FULL_PANO_HEIGHT_PROP_NAME),
+                            "projectionType" to (getStringProp(XMP.GPANO_PROJECTION_TYPE_PROP_NAME) ?: XMP.GPANO_PROJECTION_TYPE_DEFAULT),
                         )
                         result.success(fields)
                         return
@@ -580,6 +628,55 @@ class MetadataHandler(private val context: Context) : MethodCallHandler {
         result.error("getPanoramaInfo-empty", "failed to read XMP from uri=$uri", null)
     }
 
+    private fun getContentResolverProp(call: MethodCall, result: MethodChannel.Result) {
+        val mimeType = call.argument<String>("mimeType")
+        val uri = call.argument<String>("uri")?.let { Uri.parse(it) }
+        val prop = call.argument<String>("prop")
+        if (mimeType == null || uri == null || prop == null) {
+            result.error("getContentResolverProp-args", "failed because of missing arguments", null)
+            return
+        }
+
+        var contentUri: Uri = uri
+        if (uri.scheme == ContentResolver.SCHEME_CONTENT && MediaStore.AUTHORITY.equals(uri.host, ignoreCase = true)) {
+            try {
+                val id = ContentUris.parseId(uri)
+                contentUri = when {
+                    isImage(mimeType) -> ContentUris.withAppendedId(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, id)
+                    isVideo(mimeType) -> ContentUris.withAppendedId(MediaStore.Video.Media.EXTERNAL_CONTENT_URI, id)
+                    else -> uri
+                }
+                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
+                    contentUri = MediaStore.setRequireOriginal(contentUri)
+                }
+            } catch (e: NumberFormatException) {
+                // ignore
+            }
+        }
+
+        val projection = arrayOf(prop)
+        val cursor = context.contentResolver.query(contentUri, projection, null, null, null)
+        if (cursor != null && cursor.moveToFirst()) {
+            var value: Any? = null
+            try {
+                value = when (cursor.getType(0)) {
+                    Cursor.FIELD_TYPE_NULL -> null
+                    Cursor.FIELD_TYPE_INTEGER -> cursor.getLong(0)
+                    Cursor.FIELD_TYPE_FLOAT -> cursor.getFloat(0)
+                    Cursor.FIELD_TYPE_STRING -> cursor.getString(0)
+                    Cursor.FIELD_TYPE_BLOB -> cursor.getBlob(0)
+                    else -> null
+                }
+            } catch (e: Exception) {
+                Log.w(LOG_TAG, "failed to get value for key=$prop", e)
+            }
+            cursor.close()
+            result.success(value?.toString())
+        } else {
+            result.error("getContentResolverProp-null", "failed to get cursor for contentUri=$contentUri", null)
+        }
+    }
+
     private fun getEmbeddedPictures(call: MethodCall, result: MethodChannel.Result) {
         val uri = call.argument<String>("uri")?.let { Uri.parse(it) }
         if (uri == null) {
@@ -619,7 +716,7 @@ class MetadataHandler(private val context: Context) : MethodCallHandler {
                     val orientation = exif.getAttributeInt(ExifInterface.TAG_ORIENTATION, ExifInterface.ORIENTATION_NORMAL)
                     exif.thumbnailBitmap?.let { bitmap ->
                         TransformationUtils.rotateImageExif(BitmapUtils.getBitmapPool(context), bitmap, orientation)?.let {
-                            it.getBytes(canHaveAlpha = false, recycle = false)?.let { thumbnails.add(it) }
+                            it.getBytes(canHaveAlpha = false, recycle = false)?.let { bytes -> thumbnails.add(bytes) }
                         }
                     }
                 }
@@ -733,7 +830,7 @@ class MetadataHandler(private val context: Context) : MethodCallHandler {
         private val LOG_TAG = LogUtils.createTag(MetadataHandler::class.java)
         const val CHANNEL = "deckers.thibault/aves/metadata"
 
-        // catalog metadata
+        // catalog metadata & page info
         private const val KEY_MIME_TYPE = "mimeType"
         private const val KEY_DATE_MILLIS = "dateMillis"
         private const val KEY_FLAGS = "flags"
@@ -742,6 +839,12 @@ class MetadataHandler(private val context: Context) : MethodCallHandler {
         private const val KEY_LONGITUDE = "longitude"
         private const val KEY_XMP_SUBJECTS = "xmpSubjects"
         private const val KEY_XMP_TITLE_DESCRIPTION = "xmpTitleDescription"
+        private const val KEY_HEIGHT = "height"
+        private const val KEY_WIDTH = "width"
+        private const val KEY_PAGE = "page"
+        private const val KEY_TRACK_ID = "trackId"
+        private const val KEY_IS_DEFAULT = "isDefault"
+        private const val KEY_DURATION = "durationMillis"
 
         private const val MASK_IS_ANIMATED = 1 shl 0
         private const val MASK_IS_FLIPPED = 1 shl 1

android/app/src/main/kotlin/deckers/thibault/aves/channel/calls/StorageHandler.kt

@@ -5,7 +5,7 @@ import android.media.MediaScannerConnection
 import android.net.Uri
 import android.os.Build
 import android.os.storage.StorageManager
-import androidx.annotation.RequiresApi
+import deckers.thibault.aves.channel.calls.Coresult.Companion.safe
 import deckers.thibault.aves.utils.PermissionManager
 import deckers.thibault.aves.utils.StorageUtils.getVolumePaths
 import io.flutter.plugin.common.MethodCall
@@ -20,27 +20,18 @@ import java.util.*
 class StorageHandler(private val context: Context) : MethodCallHandler {
     override fun onMethodCall(call: MethodCall, result: MethodChannel.Result) {
         when (call.method) {
-            "getStorageVolumes" -> {
-                val volumes: List<Map<String, Any>> = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
-                    storageVolumes
-                } else {
-                    // TODO TLAD find alternative for Android <N
-                    emptyList()
-                }
-                result.success(volumes)
-            }
-            "getFreeSpace" -> getFreeSpace(call, result)
-            "getGrantedDirectories" -> result.success(ArrayList(PermissionManager.getGrantedDirs(context)))
-            "getInaccessibleDirectories" -> getInaccessibleDirectories(call, result)
-            "revokeDirectoryAccess" -> revokeDirectoryAccess(call, result)
-            "scanFile" -> GlobalScope.launch(Dispatchers.IO) { scanFile(call, Coresult(result)) }
+            "getStorageVolumes" -> safe(call, result, ::getStorageVolumes)
+            "getFreeSpace" -> safe(call, result, ::getFreeSpace)
+            "getGrantedDirectories" -> safe(call, result, ::getGrantedDirectories)
+            "getInaccessibleDirectories" -> safe(call, result, ::getInaccessibleDirectories)
+            "revokeDirectoryAccess" -> safe(call, result, ::revokeDirectoryAccess)
+            "scanFile" -> GlobalScope.launch(Dispatchers.IO) { safe(call, result, ::scanFile) }
             else -> result.notImplemented()
         }
     }
 
-    private val storageVolumes: List<Map<String, Any>>
-        @RequiresApi(api = Build.VERSION_CODES.N)
-        get() {
+    private fun getStorageVolumes(@Suppress("UNUSED_PARAMETER") call: MethodCall, result: MethodChannel.Result) {
+        val volumes: List<Map<String, Any>> = if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
             val volumes = ArrayList<Map<String, Any>>()
             val sm = context.getSystemService(StorageManager::class.java)
             if (sm != null) {
@@ -61,7 +52,12 @@ class StorageHandler(private val context: Context) : MethodCallHandler {
                     }
                 }
             }
-            return volumes
+            volumes
+        } else {
+            // TODO TLAD find alternative for Android <N
+            emptyList()
+        }
+        result.success(volumes)
     }
 
     private fun getFreeSpace(call: MethodCall, result: MethodChannel.Result) {
@@ -93,6 +89,10 @@ class StorageHandler(private val context: Context) : MethodCallHandler {
         }
     }
 
+    private fun getGrantedDirectories(@Suppress("UNUSED_PARAMETER") call: MethodCall, result: MethodChannel.Result) {
+        result.success(ArrayList(PermissionManager.getGrantedDirs(context)))
+    }
+
     private fun getInaccessibleDirectories(call: MethodCall, result: MethodChannel.Result) {
         val dirPaths = call.argument<List<String>>("dirPaths")
         if (dirPaths == null) {

android/app/src/main/kotlin/deckers/thibault/aves/channel/calls/fetchers/RegionFetcher.kt

@@ -1,15 +1,22 @@
-package deckers.thibault.aves.channel.calls
+package deckers.thibault.aves.channel.calls.fetchers
 
 import android.content.Context
+import android.graphics.Bitmap
 import android.graphics.BitmapFactory
 import android.graphics.BitmapRegionDecoder
 import android.graphics.Rect
 import android.net.Uri
 import android.util.Size
+import com.bumptech.glide.Glide
+import com.bumptech.glide.load.DecodeFormat
+import com.bumptech.glide.load.engine.DiskCacheStrategy
+import com.bumptech.glide.request.RequestOptions
+import deckers.thibault.aves.decoder.MultiTrackImage
 import deckers.thibault.aves.utils.BitmapUtils.getBytes
 import deckers.thibault.aves.utils.MimeTypes
 import deckers.thibault.aves.utils.StorageUtils
 import io.flutter.plugin.common.MethodChannel
+import java.io.File
 import kotlin.math.roundToInt
 
 class RegionFetcher internal constructor(
@@ -17,21 +24,42 @@ class RegionFetcher internal constructor(
 ) {
     private var lastDecoderRef: LastDecoderRef? = null
 
+    private val pageTempUris = HashMap<Pair<Uri, Int>, Uri>()
+
+    private val multiTrackGlideOptions = RequestOptions()
+        .format(DecodeFormat.PREFER_ARGB_8888)
+        .diskCacheStrategy(DiskCacheStrategy.NONE)
+        .skipMemoryCache(true)
+
     fun fetch(
         uri: Uri,
         mimeType: String,
+        pageId: Int?,
         sampleSize: Int,
         regionRect: Rect,
         imageSize: Size,
         result: MethodChannel.Result,
     ) {
+        if (MimeTypes.isHeifLike(mimeType) && pageId != null) {
+            val id = Pair(uri, pageId)
+            fetch(
+                uri = pageTempUris.getOrPut(id) { createJpegForPage(uri, pageId) },
+                mimeType = MimeTypes.JPEG,
+                pageId = null,
+                sampleSize = sampleSize,
+                regionRect = regionRect,
+                imageSize = imageSize,
+                result = result,
+            )
+            return
+        }
+
         val options = BitmapFactory.Options().apply {
             inSampleSize = sampleSize
         }
 
         var currentDecoderRef = lastDecoderRef
         if (currentDecoderRef != null && currentDecoderRef.uri != uri) {
-            currentDecoderRef.decoder.recycle()
             currentDecoderRef = null
         }
 
@@ -74,6 +102,26 @@ class RegionFetcher internal constructor(
             result.error("getRegion-read-exception", "failed to initialize region decoder for uri=$uri regionRect=$regionRect", e.message)
         }
     }
+
+    private fun createJpegForPage(sourceUri: Uri, pageId: Int): Uri {
+        val target = Glide.with(context)
+            .asBitmap()
+            .apply(multiTrackGlideOptions)
+            .load(MultiTrackImage(context, sourceUri, pageId))
+            .submit()
+        try {
+            val bitmap = target.get()
+            val tempFile = File.createTempFile("aves", null, context.cacheDir).apply {
+                deleteOnExit()
+                outputStream().use { outputStream ->
+                    bitmap.compress(Bitmap.CompressFormat.JPEG, 100, outputStream)
+                }
+            }
+            return Uri.fromFile(tempFile)
+        } finally {
+            Glide.with(context).clear(target)
+        }
+    }
 }
 
 private data class LastDecoderRef(

android/app/src/main/kotlin/deckers/thibault/aves/channel/calls/fetchers/ThumbnailFetcher.kt

@@ -1,4 +1,4 @@
-package deckers.thibault.aves.channel.calls
+package deckers.thibault.aves.channel.calls.fetchers
 
 import android.content.ContentUris
 import android.content.Context
@@ -13,11 +13,13 @@ import com.bumptech.glide.load.DecodeFormat
 import com.bumptech.glide.load.engine.DiskCacheStrategy
 import com.bumptech.glide.request.RequestOptions
 import com.bumptech.glide.signature.ObjectKey
-import deckers.thibault.aves.decoder.TiffThumbnail
+import deckers.thibault.aves.decoder.MultiTrackImage
+import deckers.thibault.aves.decoder.TiffImage
 import deckers.thibault.aves.decoder.VideoThumbnail
 import deckers.thibault.aves.utils.BitmapUtils.applyExifOrientation
 import deckers.thibault.aves.utils.BitmapUtils.getBytes
 import deckers.thibault.aves.utils.MimeTypes
+import deckers.thibault.aves.utils.MimeTypes.isHeifLike
 import deckers.thibault.aves.utils.MimeTypes.isVideo
 import deckers.thibault.aves.utils.MimeTypes.needRotationAfterContentResolverThumbnail
 import deckers.thibault.aves.utils.MimeTypes.needRotationAfterGlide
@@ -32,14 +34,16 @@ class ThumbnailFetcher internal constructor(
     private val isFlipped: Boolean,
     width: Int?,
     height: Int?,
-    page: Int?,
+    private val pageId: Int?,
     private val defaultSize: Int,
     private val result: MethodChannel.Result,
 ) {
     private val uri: Uri = Uri.parse(uri)
     private val width: Int = if (width?.takeIf { it > 0 } != null) width else defaultSize
     private val height: Int = if (height?.takeIf { it > 0 } != null) height else defaultSize
-    private val page = page ?: 0
+    private val tiffFetch = mimeType == MimeTypes.TIFF
+    private val multiTrackFetch = isHeifLike(mimeType) && pageId != null
+    private val customFetch = tiffFetch || multiTrackFetch
 
     fun fetch() {
         var bitmap: Bitmap? = null
@@ -47,7 +51,7 @@ class ThumbnailFetcher internal constructor(
         var exception: Exception? = null
 
         try {
-            if (mimeType != MimeTypes.TIFF && (width == defaultSize || height == defaultSize) && !isFlipped) {
+            if (!customFetch && (width == defaultSize || height == defaultSize) && !isFlipped) {
                 // Fetch low quality thumbnails when size is not specified.
                 // As of Android R, the Media Store content resolver may return a thumbnail
                 // that is automatically rotated according to EXIF orientation, but not flipped,
@@ -110,7 +114,7 @@ class ThumbnailFetcher internal constructor(
         // add signature to ignore cache for images which got modified but kept the same URI
         var options = RequestOptions()
             .format(DecodeFormat.PREFER_RGB_565)
-            .signature(ObjectKey("$dateModifiedSecs-$rotationDegrees-$isFlipped-$width-$page"))
+            .signature(ObjectKey("$dateModifiedSecs-$rotationDegrees-$isFlipped-$width-$pageId"))
             .override(width, height)
 
         val target = if (isVideo(mimeType)) {
@@ -121,7 +125,11 @@ class ThumbnailFetcher internal constructor(
                 .load(VideoThumbnail(context, uri))
                 .submit(width, height)
         } else {
-            val model: Any = if (mimeType == MimeTypes.TIFF) TiffThumbnail(context, uri, page) else uri
+            val model: Any = when {
+                tiffFetch -> TiffImage(context, uri, pageId)
+                multiTrackFetch -> MultiTrackImage(context, uri, pageId)
+                else -> uri
+            }
             Glide.with(context)
                 .asBitmap()
                 .apply(options)

android/app/src/main/kotlin/deckers/thibault/aves/channel/calls/fetchers/TiffRegionFetcher.kt

@@ -1,4 +1,4 @@
-package deckers.thibault.aves.channel.calls
+package deckers.thibault.aves.channel.calls.fetchers
 
 import android.content.Context
 import android.graphics.Rect
@@ -13,9 +13,9 @@ class TiffRegionFetcher internal constructor(
 ) {
     fun fetch(
         uri: Uri,
+        page: Int,
         sampleSize: Int,
         regionRect: Rect,
-        page: Int = 0,
         result: MethodChannel.Result,
     ) {
         try {

android/app/src/main/kotlin/deckers/thibault/aves/channel/streams/ContentChangeStreamHandler.kt

@@ -0,0 +1,61 @@
+package deckers.thibault.aves.channel.streams
+
+import android.content.Context
+import android.database.ContentObserver
+import android.net.Uri
+import android.os.Handler
+import android.os.Looper
+import android.provider.MediaStore
+import android.util.Log
+import deckers.thibault.aves.utils.LogUtils
+import io.flutter.plugin.common.EventChannel
+import io.flutter.plugin.common.EventChannel.EventSink
+
+class ContentChangeStreamHandler(private val context: Context) : EventChannel.StreamHandler {
+    private val contentObserver = object : ContentObserver(null) {
+        override fun onChange(selfChange: Boolean) {
+            this.onChange(selfChange, null)
+        }
+
+        override fun onChange(selfChange: Boolean, uri: Uri?) {
+            // warning: querying the content resolver right after a change
+            // sometimes yields obsolete results
+            success(uri?.toString())
+        }
+    }
+    private lateinit var eventSink: EventSink
+    private lateinit var handler: Handler
+
+    init {
+        context.contentResolver.apply {
+            registerContentObserver(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, true, contentObserver)
+            registerContentObserver(MediaStore.Video.Media.EXTERNAL_CONTENT_URI, true, contentObserver)
+        }
+    }
+
+    override fun onListen(arguments: Any?, eventSink: EventSink) {
+        this.eventSink = eventSink
+        handler = Handler(Looper.getMainLooper())
+    }
+
+    override fun onCancel(arguments: Any?) {}
+
+    fun dispose() {
+        context.contentResolver.unregisterContentObserver(contentObserver)
+    }
+
+    private fun success(uri: String?) {
+        handler.post {
+            try {
+                eventSink.success(uri)
+            } catch (e: Exception) {
+                Log.w(LOG_TAG, "failed to use event sink", e)
+            }
+        }
+    }
+
+    companion object {
+        private val LOG_TAG = LogUtils.createTag(ContentChangeStreamHandler::class.java)
+        const val CHANNEL = "deckers.thibault/aves/contentchange"
+    }
+}

android/app/src/main/kotlin/deckers/thibault/aves/channel/streams/ImageByteStreamHandler.kt

@@ -9,11 +9,14 @@ import com.bumptech.glide.Glide
 import com.bumptech.glide.load.DecodeFormat
 import com.bumptech.glide.load.engine.DiskCacheStrategy
 import com.bumptech.glide.request.RequestOptions
+import deckers.thibault.aves.decoder.MultiTrackImage
+import deckers.thibault.aves.decoder.TiffImage
 import deckers.thibault.aves.decoder.VideoThumbnail
 import deckers.thibault.aves.utils.BitmapUtils.applyExifOrientation
 import deckers.thibault.aves.utils.BitmapUtils.getBytes
 import deckers.thibault.aves.utils.LogUtils
 import deckers.thibault.aves.utils.MimeTypes
+import deckers.thibault.aves.utils.MimeTypes.isHeifLike
 import deckers.thibault.aves.utils.MimeTypes.isSupportedByFlutter
 import deckers.thibault.aves.utils.MimeTypes.isVideo
 import deckers.thibault.aves.utils.MimeTypes.needRotationAfterGlide
@@ -23,7 +26,6 @@ import io.flutter.plugin.common.EventChannel.EventSink
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.GlobalScope
 import kotlinx.coroutines.launch
-import org.beyka.tiffbitmapfactory.TiffBitmapFactory
 import java.io.IOException
 import java.io.InputStream
 
@@ -84,7 +86,7 @@ class ImageByteStreamHandler(private val activity: Activity, private val argumen
         val uri = (arguments["uri"] as String?)?.let { Uri.parse(it) }
         val rotationDegrees = arguments["rotationDegrees"] as Int
         val isFlipped = arguments["isFlipped"] as Boolean
-        val page = arguments["page"] as Int
+        val pageId = arguments["pageId"] as Int?
 
         if (mimeType == null || uri == null) {
             error("streamImage-args", "failed because of missing arguments", null)
@@ -94,11 +96,9 @@ class ImageByteStreamHandler(private val activity: Activity, private val argumen
 
         if (isVideo(mimeType)) {
             streamVideoByGlide(uri)
-        } else if (mimeType == MimeTypes.TIFF) {
-            streamTiffImage(uri, page)
         } else if (!isSupportedByFlutter(mimeType, rotationDegrees, isFlipped)) {
             // decode exotic format on platform side, then encode it in portable format for Flutter
-            streamImageByGlide(uri, mimeType, rotationDegrees, isFlipped)
+            streamImageByGlide(uri, pageId, mimeType, rotationDegrees, isFlipped)
         } else {
             // to be decoded by Flutter
             streamImageAsIs(uri)
@@ -114,11 +114,19 @@ class ImageByteStreamHandler(private val activity: Activity, private val argumen
         }
     }
 
-    private fun streamImageByGlide(uri: Uri, mimeType: String, rotationDegrees: Int, isFlipped: Boolean) {
+    private fun streamImageByGlide(uri: Uri, pageId: Int?, mimeType: String, rotationDegrees: Int, isFlipped: Boolean) {
+        val model: Any = if (isHeifLike(mimeType) && pageId != null) {
+            MultiTrackImage(activity, uri, pageId)
+        } else if (mimeType == MimeTypes.TIFF) {
+            TiffImage(activity, uri, pageId)
+        } else {
+            uri
+        }
+
         val target = Glide.with(activity)
             .asBitmap()
             .apply(glideOptions)
-            .load(uri)
+            .load(model)
             .submit()
         try {
             var bitmap = target.get()
@@ -157,28 +165,6 @@ class ImageByteStreamHandler(private val activity: Activity, private val argumen
         }
     }
 
-    private fun streamTiffImage(uri: Uri, page: Int = 0) {
-        val resolver = activity.contentResolver
-        try {
-            val fd = resolver.openFileDescriptor(uri, "r")?.detachFd()
-            if (fd == null) {
-                error("streamImage-tiff-fd", "failed to get file descriptor for uri=$uri", null)
-                return
-            }
-            val options = TiffBitmapFactory.Options().apply {
-                inDirectoryNumber = page
-            }
-            val bitmap = TiffBitmapFactory.decodeFileDescriptor(fd, options)
-            if (bitmap != null) {
-                success(bitmap.getBytes(canHaveAlpha = true, recycle = true))
-            } else {
-                error("streamImage-tiff-null", "failed to get tiff image (dir=$page) from uri=$uri", null)
-            }
-        } catch (e: Exception) {
-            error("streamImage-tiff-exception", "failed to get image from uri=$uri", toErrorDetails(e))
-        }
-    }
-
     private fun toErrorDetails(e: Exception): String? {
         val errorDetails = e.message
         return if (errorDetails?.isNotEmpty() == true) {

android/app/src/main/kotlin/deckers/thibault/aves/channel/streams/ImageOpStreamHandler.kt

@@ -5,8 +5,8 @@ import android.net.Uri
 import android.os.Handler
 import android.os.Looper
 import android.util.Log
-import deckers.thibault.aves.model.AvesImageEntry
-import deckers.thibault.aves.model.provider.FieldMap
+import deckers.thibault.aves.model.AvesEntry
+import deckers.thibault.aves.model.FieldMap
 import deckers.thibault.aves.model.provider.ImageProvider.ImageOpCallback
 import deckers.thibault.aves.model.provider.ImageProviderFactory.getProvider
 import deckers.thibault.aves.utils.LogUtils
@@ -42,6 +42,7 @@ class ImageOpStreamHandler(private val context: Context, private val arguments:
 
         when (op) {
             "delete" -> GlobalScope.launch(Dispatchers.IO) { delete() }
+            "export" -> GlobalScope.launch(Dispatchers.IO) { export() }
             "move" -> GlobalScope.launch(Dispatchers.IO) { move() }
             else -> endOfStream()
         }
@@ -80,36 +81,6 @@ class ImageOpStreamHandler(private val context: Context, private val arguments:
         }
     }
 
-    private suspend fun move() {
-        if (arguments !is Map<*, *> || entryMapList.isEmpty()) {
-            endOfStream()
-            return
-        }
-
-        // assume same provider for all entries
-        val firstEntry = entryMapList.first()
-        val provider = (firstEntry["uri"] as String?)?.let { Uri.parse(it) }?.let { getProvider(it) }
-        if (provider == null) {
-            error("move-provider", "failed to find provider for entry=$firstEntry", null)
-            return
-        }
-
-        val copy = arguments["copy"] as Boolean?
-        var destinationDir = arguments["destinationPath"] as String?
-        if (copy == null || destinationDir == null) {
-            error("move-args", "failed because of missing arguments", null)
-            return
-        }
-
-        destinationDir = StorageUtils.ensureTrailingSeparator(destinationDir)
-        val entries = entryMapList.map(::AvesImageEntry)
-        provider.moveMultiple(context, copy, destinationDir, entries, object : ImageOpCallback {
-            override fun onSuccess(fields: FieldMap) = success(fields)
-            override fun onFailure(throwable: Throwable) = error("move-failure", "failed to move entries", throwable)
-        })
-        endOfStream()
-    }
-
     private suspend fun delete() {
         if (entryMapList.isEmpty()) {
             endOfStream()
@@ -144,6 +115,66 @@ class ImageOpStreamHandler(private val context: Context, private val arguments:
         endOfStream()
     }
 
+    private suspend fun export() {
+        if (arguments !is Map<*, *> || entryMapList.isEmpty()) {
+            endOfStream()
+            return
+        }
+
+        var destinationDir = arguments["destinationPath"] as String?
+        val mimeType = arguments["mimeType"] as String?
+        if (destinationDir == null || mimeType == null) {
+            error("export-args", "failed because of missing arguments", null)
+            return
+        }
+
+        // assume same provider for all entries
+        val firstEntry = entryMapList.first()
+        val provider = (firstEntry["uri"] as String?)?.let { Uri.parse(it) }?.let { getProvider(it) }
+        if (provider == null) {
+            error("export-provider", "failed to find provider for entry=$firstEntry", null)
+            return
+        }
+
+        destinationDir = StorageUtils.ensureTrailingSeparator(destinationDir)
+        val entries = entryMapList.map(::AvesEntry)
+        provider.exportMultiple(context, mimeType, destinationDir, entries, object : ImageOpCallback {
+            override fun onSuccess(fields: FieldMap) = success(fields)
+            override fun onFailure(throwable: Throwable) = error("export-failure", "failed to export entries", throwable)
+        })
+        endOfStream()
+    }
+
+    private suspend fun move() {
+        if (arguments !is Map<*, *> || entryMapList.isEmpty()) {
+            endOfStream()
+            return
+        }
+
+        val copy = arguments["copy"] as Boolean?
+        var destinationDir = arguments["destinationPath"] as String?
+        if (copy == null || destinationDir == null) {
+            error("move-args", "failed because of missing arguments", null)
+            return
+        }
+
+        // assume same provider for all entries
+        val firstEntry = entryMapList.first()
+        val provider = (firstEntry["uri"] as String?)?.let { Uri.parse(it) }?.let { getProvider(it) }
+        if (provider == null) {
+            error("move-provider", "failed to find provider for entry=$firstEntry", null)
+            return
+        }
+
+        destinationDir = StorageUtils.ensureTrailingSeparator(destinationDir)
+        val entries = entryMapList.map(::AvesEntry)
+        provider.moveMultiple(context, copy, destinationDir, entries, object : ImageOpCallback {
+            override fun onSuccess(fields: FieldMap) = success(fields)
+            override fun onFailure(throwable: Throwable) = error("move-failure", "failed to move entries", throwable)
+        })
+        endOfStream()
+    }
+
     companion object {
         private val LOG_TAG = LogUtils.createTag(ImageOpStreamHandler::class.java)
         const val CHANNEL = "deckers.thibault/aves/imageopstream"

android/app/src/main/kotlin/deckers/thibault/aves/channel/streams/IntentStreamHandler.kt

@@ -18,4 +18,8 @@ class IntentStreamHandler : EventChannel.StreamHandler {
     fun notifyNewIntent(intentData: MutableMap<String, Any?>?) {
         eventSink?.success(intentData)
     }
+
+    companion object {
+        const val CHANNEL = "deckers.thibault/aves/intent"
+    }
 }

android/app/src/main/kotlin/deckers/thibault/aves/channel/streams/MediaStoreStreamHandler.kt

@@ -4,7 +4,7 @@ import android.content.Context
 import android.os.Handler
 import android.os.Looper
 import android.util.Log
-import deckers.thibault.aves.model.provider.FieldMap
+import deckers.thibault.aves.model.FieldMap
 import deckers.thibault.aves.model.provider.MediaStoreImageProvider
 import deckers.thibault.aves.utils.LogUtils
 import io.flutter.plugin.common.EventChannel

android/app/src/main/kotlin/deckers/thibault/aves/decoder/MultiTrackImageGlideModule.kt

@@ -0,0 +1,73 @@
+package deckers.thibault.aves.decoder
+
+import android.content.Context
+import android.graphics.Bitmap
+import android.net.Uri
+import android.os.Build
+import com.bumptech.glide.Glide
+import com.bumptech.glide.Priority
+import com.bumptech.glide.Registry
+import com.bumptech.glide.annotation.GlideModule
+import com.bumptech.glide.load.DataSource
+import com.bumptech.glide.load.Options
+import com.bumptech.glide.load.data.DataFetcher
+import com.bumptech.glide.load.data.DataFetcher.DataCallback
+import com.bumptech.glide.load.model.ModelLoader
+import com.bumptech.glide.load.model.ModelLoaderFactory
+import com.bumptech.glide.load.model.MultiModelLoaderFactory
+import com.bumptech.glide.module.LibraryGlideModule
+import com.bumptech.glide.signature.ObjectKey
+import deckers.thibault.aves.metadata.MultiTrackMedia
+
+
+@GlideModule
+class MultiTrackImageGlideModule : LibraryGlideModule() {
+    override fun registerComponents(context: Context, glide: Glide, registry: Registry) {
+        registry.append(MultiTrackImage::class.java, Bitmap::class.java, MultiTrackThumbnailLoader.Factory())
+    }
+}
+
+class MultiTrackImage(val context: Context, val uri: Uri, val trackId: Int?)
+
+internal class MultiTrackThumbnailLoader : ModelLoader<MultiTrackImage, Bitmap> {
+    override fun buildLoadData(model: MultiTrackImage, width: Int, height: Int, options: Options): ModelLoader.LoadData<Bitmap> {
+        return ModelLoader.LoadData(ObjectKey(model.uri), MultiTrackImageFetcher(model, width, height))
+    }
+
+    override fun handles(model: MultiTrackImage): Boolean = true
+
+    internal class Factory : ModelLoaderFactory<MultiTrackImage, Bitmap> {
+        override fun build(multiFactory: MultiModelLoaderFactory): ModelLoader<MultiTrackImage, Bitmap> = MultiTrackThumbnailLoader()
+
+        override fun teardown() {}
+    }
+}
+
+internal class MultiTrackImageFetcher(val model: MultiTrackImage, val width: Int, val height: Int) : DataFetcher<Bitmap> {
+    override fun loadData(priority: Priority, callback: DataCallback<in Bitmap>) {
+        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.P) {
+            callback.onLoadFailed(Exception("unsupported Android version"))
+            return
+        }
+
+        val context = model.context
+        val uri = model.uri
+        val trackId = model.trackId
+
+        val bitmap = MultiTrackMedia.getImage(context, uri, trackId)
+        if (bitmap == null) {
+            callback.onLoadFailed(Exception("null bitmap"))
+        } else {
+            callback.onDataReady(bitmap)
+        }
+    }
+
+    override fun cleanup() {}
+
+    // cannot cancel
+    override fun cancel() {}
+
+    override fun getDataClass(): Class<Bitmap> = Bitmap::class.java
+
+    override fun getDataSource(): DataSource = DataSource.LOCAL
+}

android/app/src/main/kotlin/deckers/thibault/aves/decoder/TiffGlideModule.kt

@@ -0,0 +1,99 @@
+package deckers.thibault.aves.decoder
+
+import android.content.Context
+import android.graphics.Bitmap
+import android.net.Uri
+import com.bumptech.glide.Glide
+import com.bumptech.glide.Priority
+import com.bumptech.glide.Registry
+import com.bumptech.glide.annotation.GlideModule
+import com.bumptech.glide.load.DataSource
+import com.bumptech.glide.load.Options
+import com.bumptech.glide.load.data.DataFetcher
+import com.bumptech.glide.load.data.DataFetcher.DataCallback
+import com.bumptech.glide.load.model.ModelLoader
+import com.bumptech.glide.load.model.ModelLoaderFactory
+import com.bumptech.glide.load.model.MultiModelLoaderFactory
+import com.bumptech.glide.module.LibraryGlideModule
+import com.bumptech.glide.signature.ObjectKey
+import org.beyka.tiffbitmapfactory.TiffBitmapFactory
+
+@GlideModule
+class TiffGlideModule : LibraryGlideModule() {
+    override fun registerComponents(context: Context, glide: Glide, registry: Registry) {
+        registry.append(TiffImage::class.java, Bitmap::class.java, TiffLoader.Factory())
+    }
+}
+
+class TiffImage(val context: Context, val uri: Uri, val page: Int?)
+
+internal class TiffLoader : ModelLoader<TiffImage, Bitmap> {
+    override fun buildLoadData(model: TiffImage, width: Int, height: Int, options: Options): ModelLoader.LoadData<Bitmap> {
+        return ModelLoader.LoadData(ObjectKey(model.uri), TiffFetcher(model, width, height))
+    }
+
+    override fun handles(model: TiffImage): Boolean = true
+
+    internal class Factory : ModelLoaderFactory<TiffImage, Bitmap> {
+        override fun build(multiFactory: MultiModelLoaderFactory): ModelLoader<TiffImage, Bitmap> = TiffLoader()
+
+        override fun teardown() {}
+    }
+}
+
+internal class TiffFetcher(val model: TiffImage, val width: Int, val height: Int) : DataFetcher<Bitmap> {
+    override fun loadData(priority: Priority, callback: DataCallback<in Bitmap>) {
+        val context = model.context
+        val uri = model.uri
+        val page = model.page ?: 0
+
+        var sampleSize = 1
+        if (width > 0 && height > 0) {
+            // determine sample size
+            val fd = context.contentResolver.openFileDescriptor(uri, "r")?.detachFd()
+            if (fd == null) {
+                callback.onLoadFailed(Exception("null file descriptor"))
+                return
+            }
+            val options = TiffBitmapFactory.Options().apply {
+                inJustDecodeBounds = true
+                inDirectoryNumber = page
+            }
+            TiffBitmapFactory.decodeFileDescriptor(fd, options)
+            val imageWidth = options.outWidth
+            val imageHeight = options.outHeight
+            if (imageHeight > height || imageWidth > width) {
+                while (imageHeight / (sampleSize * 2) > height && imageWidth / (sampleSize * 2) > width) {
+                    sampleSize *= 2
+                }
+            }
+        }
+
+        // decode
+        val fd = context.contentResolver.openFileDescriptor(uri, "r")?.detachFd()
+        if (fd == null) {
+            callback.onLoadFailed(Exception("null file descriptor"))
+            return
+        }
+        val options = TiffBitmapFactory.Options().apply {
+            inJustDecodeBounds = false
+            inDirectoryNumber = page
+            inSampleSize = sampleSize
+        }
+        val bitmap = TiffBitmapFactory.decodeFileDescriptor(fd, options)
+        if (bitmap == null) {
+            callback.onLoadFailed(Exception("null bitmap"))
+        } else {
+            callback.onDataReady(bitmap)
+        }
+    }
+
+    override fun cleanup() {}
+
+    // cannot cancel
+    override fun cancel() {}
+
+    override fun getDataClass(): Class<Bitmap> = Bitmap::class.java
+
+    override fun getDataSource(): DataSource = DataSource.LOCAL
+}

android/app/src/main/kotlin/deckers/thibault/aves/decoder/TiffThumbnailGlideModule.kt

@@ -1,99 +0,0 @@
-package deckers.thibault.aves.decoder
-
-import android.content.Context
-import android.net.Uri
-import com.bumptech.glide.Glide
-import com.bumptech.glide.Priority
-import com.bumptech.glide.Registry
-import com.bumptech.glide.annotation.GlideModule
-import com.bumptech.glide.load.DataSource
-import com.bumptech.glide.load.Options
-import com.bumptech.glide.load.data.DataFetcher
-import com.bumptech.glide.load.data.DataFetcher.DataCallback
-import com.bumptech.glide.load.model.ModelLoader
-import com.bumptech.glide.load.model.ModelLoaderFactory
-import com.bumptech.glide.load.model.MultiModelLoaderFactory
-import com.bumptech.glide.module.LibraryGlideModule
-import com.bumptech.glide.signature.ObjectKey
-import deckers.thibault.aves.utils.BitmapUtils.getBytes
-import org.beyka.tiffbitmapfactory.TiffBitmapFactory
-import java.io.InputStream
-
-@GlideModule
-class TiffThumbnailGlideModule : LibraryGlideModule() {
-    override fun registerComponents(context: Context, glide: Glide, registry: Registry) {
-        registry.append(TiffThumbnail::class.java, InputStream::class.java, TiffThumbnailLoader.Factory())
-    }
-}
-
-class TiffThumbnail(val context: Context, val uri: Uri, val page: Int)
-
-internal class TiffThumbnailLoader : ModelLoader<TiffThumbnail, InputStream> {
-    override fun buildLoadData(model: TiffThumbnail, width: Int, height: Int, options: Options): ModelLoader.LoadData<InputStream> {
-        return ModelLoader.LoadData(ObjectKey(model.uri), TiffThumbnailFetcher(model, width, height))
-    }
-
-    override fun handles(tiffThumbnail: TiffThumbnail): Boolean = true
-
-    internal class Factory : ModelLoaderFactory<TiffThumbnail, InputStream> {
-        override fun build(multiFactory: MultiModelLoaderFactory): ModelLoader<TiffThumbnail, InputStream> = TiffThumbnailLoader()
-
-        override fun teardown() {}
-    }
-}
-
-internal class TiffThumbnailFetcher(val model: TiffThumbnail, val width: Int, val height: Int) : DataFetcher<InputStream> {
-    override fun loadData(priority: Priority, callback: DataCallback<in InputStream>) {
-        val context = model.context
-        val uri = model.uri
-        val page = model.page
-
-        // determine sample size
-        var fd = context.contentResolver.openFileDescriptor(uri, "r")?.detachFd()
-        if (fd == null) {
-            callback.onLoadFailed(Exception("null file descriptor"))
-            return
-        }
-        var sampleSize = 1
-        var options = TiffBitmapFactory.Options().apply {
-            inJustDecodeBounds = true
-            inDirectoryNumber = page
-        }
-        TiffBitmapFactory.decodeFileDescriptor(fd, options)
-        val imageWidth = options.outWidth
-        val imageHeight = options.outHeight
-        if (imageHeight > height || imageWidth > width) {
-            while (imageHeight / (sampleSize * 2) > height && imageWidth / (sampleSize * 2) > width) {
-                sampleSize *= 2
-            }
-        }
-
-        // decode
-        fd = context.contentResolver.openFileDescriptor(uri, "r")?.detachFd()
-        if (fd == null) {
-            callback.onLoadFailed(Exception("null file descriptor"))
-            return
-        }
-        options = TiffBitmapFactory.Options().apply {
-            inJustDecodeBounds = false
-            inDirectoryNumber = page
-            inSampleSize = sampleSize
-        }
-        val bitmap = TiffBitmapFactory.decodeFileDescriptor(fd, options)
-        if (bitmap == null) {
-            callback.onLoadFailed(Exception("null bitmap"))
-        } else {
-            callback.onDataReady(bitmap.getBytes()?.inputStream())
-        }
-    }
-
-    // already cleaned up in loadData and ByteArrayInputStream will be GC'd
-    override fun cleanup() {}
-
-    // cannot cancel
-    override fun cancel() {}
-
-    override fun getDataClass(): Class<InputStream> = InputStream::class.java
-
-    override fun getDataSource(): DataSource = DataSource.LOCAL
-}

android/app/src/main/kotlin/deckers/thibault/aves/decoder/VideoThumbnailGlideModule.kt

@@ -1,7 +1,9 @@
 package deckers.thibault.aves.decoder
 
 import android.content.Context
+import android.media.MediaMetadataRetriever
 import android.net.Uri
+import android.os.Build
 import com.bumptech.glide.Glide
 import com.bumptech.glide.Priority
 import com.bumptech.glide.Registry
@@ -34,7 +36,7 @@ internal class VideoThumbnailLoader : ModelLoader<VideoThumbnail, InputStream> {
         return ModelLoader.LoadData(ObjectKey(model.uri), VideoThumbnailFetcher(model))
     }
 
-    override fun handles(videoThumbnail: VideoThumbnail): Boolean = true
+    override fun handles(model: VideoThumbnail): Boolean = true
 
     internal class Factory : ModelLoaderFactory<VideoThumbnail, InputStream> {
         override fun build(multiFactory: MultiModelLoaderFactory): ModelLoader<VideoThumbnail, InputStream> = VideoThumbnailLoader()
@@ -48,9 +50,29 @@ internal class VideoThumbnailFetcher(private val model: VideoThumbnail) : DataFe
         val retriever = openMetadataRetriever(model.context, model.uri)
         if (retriever != null) {
             try {
-                val picture = retriever.embeddedPicture ?: retriever.frameAtTime?.getBytes(canHaveAlpha = false, recycle = false)
-                if (picture != null) {
-                    callback.onDataReady(ByteArrayInputStream(picture))
+                var bytes = retriever.embeddedPicture
+                if (bytes == null) {
+                    // try to match the thumbnails returned by the content resolver / Media Store
+                    // the following strategies are from empirical evidence from a few test devices:
+                    // - API 29: sync frame closest to the middle
+                    // - API 26/27: default representative frame at any time position
+                    var timeMillis: Long? = null
+                    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
+                        val durationMillis = retriever.extractMetadata(MediaMetadataRetriever.METADATA_KEY_DURATION)?.toLongOrNull()
+                        if (durationMillis != null) {
+                            timeMillis = durationMillis / 2
+                        }
+                    }
+                    val frame = if (timeMillis != null) {
+                        retriever.getFrameAtTime(timeMillis * 1000)
+                    } else {
+                        retriever.frameAtTime
+                    }
+                    bytes = frame?.getBytes(canHaveAlpha = false, recycle = false)
+                }
+
+                if (bytes != null) {
+                    callback.onDataReady(ByteArrayInputStream(bytes))
                 } else {
                     callback.onLoadFailed(Exception("failed to get embedded picture or any frame"))
                 }

android/app/src/main/kotlin/deckers/thibault/aves/metadata/MultiTrackMedia.kt

@@ -0,0 +1,59 @@
+package deckers.thibault.aves.metadata
+
+import android.content.Context
+import android.graphics.Bitmap
+import android.media.MediaExtractor
+import android.media.MediaFormat
+import android.net.Uri
+import android.os.Build
+import android.util.Log
+import androidx.annotation.RequiresApi
+import deckers.thibault.aves.utils.LogUtils
+import deckers.thibault.aves.utils.MimeTypes
+import deckers.thibault.aves.utils.StorageUtils
+
+object MultiTrackMedia {
+    private val LOG_TAG = LogUtils.createTag(MultiTrackMedia::class.java)
+
+    @RequiresApi(Build.VERSION_CODES.P)
+    fun getImage(context: Context, uri: Uri, trackId: Int?): Bitmap? {
+        val retriever = StorageUtils.openMetadataRetriever(context, uri) ?: return null
+        try {
+            return if (trackId != null) {
+                val imageIndex = trackIdToImageIndex(context, uri, trackId) ?: return null
+                retriever.getImageAtIndex(imageIndex)
+            } else {
+                retriever.primaryImage
+            }
+        } catch (e: Exception) {
+            Log.w(LOG_TAG, "failed to extract image from uri=$uri trackId=$trackId", e)
+        } finally {
+            // cannot rely on `MediaMetadataRetriever` being `AutoCloseable` on older APIs
+            retriever.release()
+        }
+        return null
+    }
+
+    private fun trackIdToImageIndex(context: Context, uri: Uri, trackId: Int): Int? {
+        val extractor = MediaExtractor()
+        try {
+            extractor.setDataSource(context, uri, null)
+            val trackCount = extractor.trackCount
+            var imageIndex = 0
+            for (i in 0 until trackCount) {
+                val trackFormat = extractor.getTrackFormat(i)
+                if (trackId == trackFormat.getInteger(MediaFormat.KEY_TRACK_ID)) {
+                    return imageIndex
+                }
+                if (MimeTypes.isImage(trackFormat.getString(MediaFormat.KEY_MIME))) {
+                    imageIndex++
+                }
+            }
+        } catch (e: Exception) {
+            Log.w(LOG_TAG, "failed to get image index for uri=$uri, trackId=$trackId", e)
+        } finally {
+            extractor.release()
+        }
+        return null
+    }
+}

android/app/src/main/kotlin/deckers/thibault/aves/metadata/XMP.kt

@@ -1,6 +1,7 @@
 package deckers.thibault.aves.metadata
 
 import android.util.Log
+import com.adobe.internal.xmp.XMPError
 import com.adobe.internal.xmp.XMPException
 import com.adobe.internal.xmp.XMPMeta
 import deckers.thibault.aves.utils.LogUtils
@@ -9,6 +10,8 @@ import java.util.*
 object XMP {
     private val LOG_TAG = LogUtils.createTag(XMP::class.java)
 
+    // standard namespaces
+    // cf com.adobe.internal.xmp.XMPConst
     const val DC_SCHEMA_NS = "http://purl.org/dc/elements/1.1/"
     const val PHOTOSHOP_SCHEMA_NS = "http://ns.adobe.com/photoshop/1.0/"
     const val XMP_SCHEMA_NS = "http://ns.adobe.com/xap/1.0/"
@@ -51,27 +54,46 @@ object XMP {
     const val GPANO_CROPPED_AREA_TOP_PROP_NAME = "GPano:CroppedAreaTopPixels"
     const val GPANO_FULL_PANO_HEIGHT_PROP_NAME = "GPano:FullPanoHeightPixels"
     const val GPANO_FULL_PANO_WIDTH_PROP_NAME = "GPano:FullPanoWidthPixels"
-    private const val GPANO_PROJECTION_TYPE_PROP_NAME = "GPano:ProjectionType"
+    const val GPANO_PROJECTION_TYPE_PROP_NAME = "GPano:ProjectionType"
+    const val GPANO_PROJECTION_TYPE_DEFAULT = "equirectangular"
 
     private const val PMTM_IS_PANO360 = "pmtm:IsPano360"
 
+    // `GPano:ProjectionType` is required by spec but it is sometimes missing, assuming default
+    // `GPano:FullPanoHeightPixels` is required by spec but it is sometimes missing (e.g. Samsung Camera app panorama mode)
     private val gpanoRequiredProps = listOf(
         GPANO_CROPPED_AREA_HEIGHT_PROP_NAME,
         GPANO_CROPPED_AREA_WIDTH_PROP_NAME,
         GPANO_CROPPED_AREA_LEFT_PROP_NAME,
         GPANO_CROPPED_AREA_TOP_PROP_NAME,
-        GPANO_FULL_PANO_HEIGHT_PROP_NAME,
         GPANO_FULL_PANO_WIDTH_PROP_NAME,
-        GPANO_PROJECTION_TYPE_PROP_NAME,
     )
 
     // extensions
 
     fun XMPMeta.isPanorama(): Boolean {
         // Google
+        try {
             if (gpanoRequiredProps.all { doesPropertyExist(GPANO_SCHEMA_NS, it) }) return true
+        } catch (e: XMPException) {
+            if (e.errorCode != XMPError.BADSCHEMA) {
+                // `BADSCHEMA` code is reported when we check a property
+                // from a non standard namespace, and that namespace is not declared in the XMP
+                Log.w(LOG_TAG, "failed to check Google panorama props from XMP", e)
+            }
+        }
+
         // Photomatix
+        try {
             if (getPropertyString(PMTM_SCHEMA_NS, PMTM_IS_PANO360) == "Yes") return true
+        } catch (e: XMPException) {
+            if (e.errorCode != XMPError.BADSCHEMA) {
+                // `BADSCHEMA` code is reported when we check a property
+                // from a non standard namespace, and that namespace is not declared in the XMP
+                Log.w(LOG_TAG, "failed to check Photomatix panorama props from XMP", e)
+            }
+        }
+
         return false
     }
 
@@ -102,7 +124,7 @@ object XMP {
                 }
             }
         } catch (e: XMPException) {
-            Log.w(LOG_TAG, "failed to get text for XMP schema=$schema, propName=$propName", e)
+            Log.w(LOG_TAG, "failed to get date for XMP schema=$schema, propName=$propName", e)
         }
     }
 }

android/app/src/main/kotlin/deckers/thibault/aves/model/AvesEntry.kt

@@ -1,13 +1,15 @@
 package deckers.thibault.aves.model
 
 import android.net.Uri
-import deckers.thibault.aves.model.provider.FieldMap
+import deckers.thibault.aves.model.FieldMap
 
-class AvesImageEntry(map: FieldMap) {
+class AvesEntry(map: FieldMap) {
     val uri: Uri = Uri.parse(map["uri"] as String) // content or file URI
     val path = map["path"] as String? // best effort to get local path
+    val pageId = map["pageId"] as Int? // null means the main entry
     val mimeType = map["mimeType"] as String
     val width = map["width"] as Int
     val height = map["height"] as Int
     val rotationDegrees = map["rotationDegrees"] as Int
+    val isFlipped = map["isFlipped"] as Boolean
 }

android/app/src/main/kotlin/deckers/thibault/aves/model/FieldMap.kt

@@ -0,0 +1,3 @@
+package deckers.thibault.aves.model
+
+typealias FieldMap = MutableMap<String, Any?>

android/app/src/main/kotlin/deckers/thibault/aves/model/SourceEntry.kt

@@ -25,13 +25,13 @@ import deckers.thibault.aves.metadata.Metadata.getRotationDegreesForExifCode
 import deckers.thibault.aves.metadata.MetadataExtractorHelper.getSafeDateMillis
 import deckers.thibault.aves.metadata.MetadataExtractorHelper.getSafeInt
 import deckers.thibault.aves.metadata.MetadataExtractorHelper.getSafeLong
-import deckers.thibault.aves.model.provider.FieldMap
+import deckers.thibault.aves.model.FieldMap
 import deckers.thibault.aves.utils.MimeTypes
 import deckers.thibault.aves.utils.StorageUtils
 import org.beyka.tiffbitmapfactory.TiffBitmapFactory
 import java.io.IOException
 
-class SourceImageEntry {
+class SourceEntry {
     val uri: Uri // content or file URI
     var path: String? = null // best effort to get local path
     private val sourceMimeType: String
@@ -119,7 +119,7 @@ class SourceImageEntry {
     // metadata retrieval
     // expects entry with: uri, mimeType
     // finds: width, height, orientation/rotation, date, title, duration
-    fun fillPreCatalogMetadata(context: Context): SourceImageEntry {
+    fun fillPreCatalogMetadata(context: Context): SourceEntry {
         if (isSvg) return this
         if (isVideo) {
             fillVideoByMediaMetadataRetriever(context)

android/app/src/main/kotlin/deckers/thibault/aves/model/provider/ContentImageProvider.kt

@@ -3,7 +3,7 @@ package deckers.thibault.aves.model.provider
 import android.content.Context
 import android.net.Uri
 import android.provider.MediaStore
-import deckers.thibault.aves.model.SourceImageEntry
+import deckers.thibault.aves.model.SourceEntry
 
 internal class ContentImageProvider : ImageProvider() {
     override suspend fun fetchSingle(context: Context, uri: Uri, mimeType: String?, callback: ImageOpCallback) {
@@ -28,7 +28,7 @@ internal class ContentImageProvider : ImageProvider() {
             return
         }
 
-        val entry = SourceImageEntry(map).fillPreCatalogMetadata(context)
+        val entry = SourceEntry(map).fillPreCatalogMetadata(context)
         if (entry.isSized || entry.isSvg) {
             callback.onSuccess(entry.toMap())
         } else {

android/app/src/main/kotlin/deckers/thibault/aves/model/provider/FileImageProvider.kt

@@ -2,7 +2,7 @@ package deckers.thibault.aves.model.provider
 
 import android.content.Context
 import android.net.Uri
-import deckers.thibault.aves.model.SourceImageEntry
+import deckers.thibault.aves.model.SourceEntry
 import java.io.File
 
 internal class FileImageProvider : ImageProvider() {
@@ -12,7 +12,7 @@ internal class FileImageProvider : ImageProvider() {
             return
         }
 
-        val entry = SourceImageEntry(uri, mimeType)
+        val entry = SourceEntry(uri, mimeType)
 
         val path = uri.path
         if (path != null) {

android/app/src/main/kotlin/deckers/thibault/aves/model/provider/ImageProvider.kt

@@ -2,18 +2,28 @@ package deckers.thibault.aves.model.provider
 
 import android.content.ContentUris
 import android.content.Context
+import android.graphics.Bitmap
 import android.media.MediaScannerConnection
 import android.net.Uri
+import android.os.Build
 import android.provider.MediaStore
 import android.util.Log
 import androidx.exifinterface.media.ExifInterface
+import com.bumptech.glide.Glide
+import com.bumptech.glide.load.DecodeFormat
+import com.bumptech.glide.load.engine.DiskCacheStrategy
+import com.bumptech.glide.request.RequestOptions
 import com.commonsware.cwac.document.DocumentFileCompat
-import deckers.thibault.aves.model.AvesImageEntry
+import deckers.thibault.aves.decoder.MultiTrackImage
+import deckers.thibault.aves.decoder.TiffImage
+import deckers.thibault.aves.model.AvesEntry
 import deckers.thibault.aves.model.ExifOrientationOp
+import deckers.thibault.aves.model.FieldMap
+import deckers.thibault.aves.utils.BitmapUtils
 import deckers.thibault.aves.utils.LogUtils
-import deckers.thibault.aves.utils.MimeTypes.isImage
-import deckers.thibault.aves.utils.MimeTypes.isVideo
+import deckers.thibault.aves.utils.MimeTypes
 import deckers.thibault.aves.utils.StorageUtils.copyFileToTemp
+import deckers.thibault.aves.utils.StorageUtils.createDirectoryIfAbsent
 import deckers.thibault.aves.utils.StorageUtils.getDocumentFile
 import java.io.File
 import java.io.FileNotFoundException
@@ -32,10 +42,151 @@ abstract class ImageProvider {
         throw UnsupportedOperationException()
     }
 
-    open suspend fun moveMultiple(context: Context, copy: Boolean, destinationDir: String, entries: List<AvesImageEntry>, callback: ImageOpCallback) {
+    open suspend fun moveMultiple(context: Context, copy: Boolean, destinationDir: String, entries: List<AvesEntry>, callback: ImageOpCallback) {
         callback.onFailure(UnsupportedOperationException())
     }
 
+    suspend fun exportMultiple(
+        context: Context,
+        mimeType: String,
+        destinationDir: String,
+        entries: List<AvesEntry>,
+        callback: ImageOpCallback,
+    ) {
+        val destinationDirDocFile = createDirectoryIfAbsent(context, destinationDir)
+        if (destinationDirDocFile == null) {
+            callback.onFailure(Exception("failed to create directory at path=$destinationDir"))
+            return
+        }
+
+        for (entry in entries) {
+            val sourceUri = entry.uri
+            val sourcePath = entry.path
+            val pageId = entry.pageId
+
+            val result = hashMapOf<String, Any?>(
+                "uri" to sourceUri.toString(),
+                "pageId" to pageId,
+                "success" to false,
+            )
+
+            try {
+                val newFields = exportSingleByTreeDocAndScan(
+                    context = context,
+                    sourceEntry = entry,
+                    destinationDir = destinationDir,
+                    destinationDirDocFile = destinationDirDocFile,
+                    exportMimeType = mimeType,
+                )
+                result["newFields"] = newFields
+                result["success"] = true
+            } catch (e: Exception) {
+                Log.w(LOG_TAG, "failed to export to destinationDir=$destinationDir entry with sourcePath=$sourcePath pageId=$pageId", e)
+            }
+            callback.onSuccess(result)
+        }
+    }
+
+    private suspend fun exportSingleByTreeDocAndScan(
+        context: Context,
+        sourceEntry: AvesEntry,
+        destinationDir: String,
+        destinationDirDocFile: DocumentFileCompat,
+        exportMimeType: String,
+    ): FieldMap {
+        val sourceMimeType = sourceEntry.mimeType
+        val sourceUri = sourceEntry.uri
+        val pageId = sourceEntry.pageId
+
+        var desiredNameWithoutExtension = if (sourceEntry.path != null) {
+            val sourcePath = sourceEntry.path
+            val sourceFile = File(sourcePath)
+            val sourceFileName = sourceFile.name
+            sourceFileName.replaceFirst("[.][^.]+$".toRegex(), "")
+        } else {
+            sourceUri.lastPathSegment!!
+        }
+        if (pageId != null) {
+            val page = if (sourceMimeType == MimeTypes.TIFF) pageId + 1 else pageId
+            desiredNameWithoutExtension += "_${page.toString().padStart(3, '0')}"
+        }
+        val desiredFileName = desiredNameWithoutExtension + when (exportMimeType) {
+            MimeTypes.JPEG -> ".jpg"
+            MimeTypes.PNG -> ".png"
+            MimeTypes.WEBP -> ".webp"
+            else -> throw Exception("unsupported export MIME type=$exportMimeType")
+        }
+
+        if (File(destinationDir, desiredFileName).exists()) {
+            throw Exception("file with name=$desiredFileName already exists in destination directory")
+        }
+
+        // the file created from a `TreeDocumentFile` is also a `TreeDocumentFile`
+        // but in order to open an output stream to it, we need to use a `SingleDocumentFile`
+        // through a document URI, not a tree URI
+        // note that `DocumentFile.getParentFile()` returns null if we did not pick a tree first
+        @Suppress("BlockingMethodInNonBlockingContext")
+        val destinationTreeFile = destinationDirDocFile.createFile(exportMimeType, desiredNameWithoutExtension)
+        val destinationDocFile = DocumentFileCompat.fromSingleUri(context, destinationTreeFile.uri)
+
+        val model: Any = if (MimeTypes.isHeifLike(sourceMimeType) && pageId != null) {
+            MultiTrackImage(context, sourceUri, pageId)
+        } else if (sourceMimeType == MimeTypes.TIFF) {
+            TiffImage(context, sourceUri, pageId)
+        } else {
+            sourceUri
+        }
+
+        // request a fresh image with the highest quality format
+        val glideOptions = RequestOptions()
+            .format(DecodeFormat.PREFER_ARGB_8888)
+            .diskCacheStrategy(DiskCacheStrategy.NONE)
+            .skipMemoryCache(true)
+
+        val target = Glide.with(context)
+            .asBitmap()
+            .apply(glideOptions)
+            .load(model)
+            .submit()
+        try {
+            @Suppress("BlockingMethodInNonBlockingContext")
+            var bitmap = target.get()
+            if (MimeTypes.needRotationAfterGlide(sourceMimeType)) {
+                bitmap = BitmapUtils.applyExifOrientation(context, bitmap, sourceEntry.rotationDegrees, sourceEntry.isFlipped)
+            }
+            bitmap ?: throw Exception("failed to get image from uri=$sourceUri page=$pageId")
+
+            val quality = 100
+            val format = when (exportMimeType) {
+                MimeTypes.JPEG -> Bitmap.CompressFormat.JPEG
+                MimeTypes.PNG -> Bitmap.CompressFormat.PNG
+                MimeTypes.WEBP -> if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R) {
+                    if (quality == 100) {
+                        Bitmap.CompressFormat.WEBP_LOSSLESS
+                    } else {
+                        Bitmap.CompressFormat.WEBP_LOSSY
+                    }
+                } else {
+                    @Suppress("DEPRECATION")
+                    Bitmap.CompressFormat.WEBP
+                }
+                else -> throw Exception("unsupported export MIME type=$exportMimeType")
+            }
+
+            @Suppress("BlockingMethodInNonBlockingContext")
+            destinationDocFile.openOutputStream().use {
+                bitmap.compress(format, quality, it)
+            }
+        } finally {
+            Glide.with(context).clear(target)
+        }
+
+        val fileName = destinationDocFile.name
+        val destinationFullPath = destinationDir + fileName
+
+        return scanNewPath(context, destinationFullPath, exportMimeType)
+    }
+
     suspend fun rename(context: Context, oldPath: String, oldMediaUri: Uri, mimeType: String, newFilename: String, callback: ImageOpCallback) {
         val oldFile = File(oldPath)
         val newFile = File(oldFile.parent, newFilename)
@@ -147,9 +298,9 @@ abstract class ImageProvider {
                     // `newURI` is possibly a file media URI (e.g. "content://media/12a9-8b42/file/62872")
                     // but we need an image/video media URI (e.g. "content://media/external/images/media/62872")
                     contentId = ContentUris.parseId(newUri)
-                    if (isImage(mimeType)) {
+                    if (MimeTypes.isImage(mimeType)) {
                         contentUri = ContentUris.withAppendedId(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, contentId)
-                    } else if (isVideo(mimeType)) {
+                    } else if (MimeTypes.isVideo(mimeType)) {
                         contentUri = ContentUris.withAppendedId(MediaStore.Video.Media.EXTERNAL_CONTENT_URI, contentId)
                     }
                 }
@@ -198,5 +349,3 @@ abstract class ImageProvider {
         private val LOG_TAG = LogUtils.createTag(ImageProvider::class.java)
     }
 }
-
-typealias FieldMap = MutableMap<String, Any?>

android/app/src/main/kotlin/deckers/thibault/aves/model/provider/MediaStoreImageProvider.kt

@@ -8,8 +8,9 @@ import android.os.Build
 import android.provider.MediaStore
 import android.util.Log
 import com.commonsware.cwac.document.DocumentFileCompat
-import deckers.thibault.aves.model.AvesImageEntry
-import deckers.thibault.aves.model.SourceImageEntry
+import deckers.thibault.aves.model.AvesEntry
+import deckers.thibault.aves.model.FieldMap
+import deckers.thibault.aves.model.SourceEntry
 import deckers.thibault.aves.utils.LogUtils
 import deckers.thibault.aves.utils.MimeTypes
 import deckers.thibault.aves.utils.MimeTypes.isImage
@@ -158,7 +159,7 @@ class MediaStoreImageProvider : ImageProvider() {
                                 // missing some attributes such as width, height, orientation.
                                 // Also, the reported size of raw images is inconsistent across devices
                                 // and Android versions (sometimes the raw size, sometimes the decoded size).
-                                val entry = SourceImageEntry(entryMap).fillPreCatalogMetadata(context)
+                                val entry = SourceEntry(entryMap).fillPreCatalogMetadata(context)
                                 entryMap = entry.toMap()
                             }
 
@@ -185,7 +186,7 @@ class MediaStoreImageProvider : ImageProvider() {
     override suspend fun delete(context: Context, uri: Uri, path: String?) {
         path ?: throw Exception("failed to delete file because path is null")
 
-        if (requireAccessPermission(context, path)) {
+        if (File(path).exists() && requireAccessPermission(context, path)) {
             // if the file is on SD card, calling the content resolver `delete()` removes the entry from the Media Store
             // but it doesn't delete the file, even if the app has the permission
             val df = getDocumentFile(context, path, uri)
@@ -203,7 +204,7 @@ class MediaStoreImageProvider : ImageProvider() {
         context: Context,
         copy: Boolean,
         destinationDir: String,
-        entries: List<AvesImageEntry>,
+        entries: List<AvesEntry>,
         callback: ImageOpCallback,
     ) {
         val destinationDirDocFile = createDirectoryIfAbsent(context, destinationDir)

android/app/src/main/kotlin/deckers/thibault/aves/utils/BitmapUtils.kt

@@ -26,7 +26,7 @@ object BitmapUtils {
         } catch (e: IllegalStateException) {
             Log.e(LOG_TAG, "failed to get bytes from bitmap", e)
         }
-        return null;
+        return null
     }
 
     fun applyExifOrientation(context: Context, bitmap: Bitmap?, rotationDegrees: Int?, isFlipped: Boolean?): Bitmap? {

android/app/src/main/kotlin/deckers/thibault/aves/utils/MimeTypes.kt

@@ -9,10 +9,10 @@ object MimeTypes {
     private const val BMP = "image/bmp"
     const val GIF = "image/gif"
     const val HEIC = "image/heic"
-    const val HEIF = "image/heif"
+    private const val HEIF = "image/heif"
     private const val ICO = "image/x-icon"
-    private const val JPEG = "image/jpeg"
-    private const val PNG = "image/png"
+    const val JPEG = "image/jpeg"
+    const val PNG = "image/png"
     const val TIFF = "image/tiff"
     private const val WBMP = "image/vnd.wap.wbmp"
     const val WEBP = "image/webp"
@@ -41,10 +41,9 @@ object MimeTypes {
 
     fun isVideo(mimeType: String?) = mimeType != null && mimeType.startsWith(VIDEO)
 
-    fun isMultimedia(mimeType: String?) = when (mimeType) {
-        HEIC, HEIF -> true
-        else -> isVideo(mimeType)
-    }
+    fun isHeifLike(mimeType: String?) = mimeType != null && (mimeType == HEIC || mimeType == HEIF)
+
+    fun isMultimedia(mimeType: String?) = isVideo(mimeType) || isHeifLike(mimeType)
 
     fun isRaw(mimeType: String): Boolean {
         return when (mimeType) {

android/build.gradle

@@ -9,7 +9,7 @@ buildscript {
         // TODO TLAD upgrade AGP to 4+ when this lands on stable: https://github.com/flutter/flutter/pull/70808
         classpath 'com.android.tools.build:gradle:3.6.4'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
-        classpath 'com.google.gms:google-services:4.3.4'
+        classpath 'com.google.gms:google-services:4.3.5'
         classpath 'com.google.firebase:firebase-crashlytics-gradle:2.4.1'
     }
 }

lib/image_providers/app_icon_image_provider.dart

@@ -2,7 +2,7 @@ import 'dart:ui' as ui show Codec;
 
 import 'package:aves/services/android_app_service.dart';
 import 'package:flutter/foundation.dart';
-import 'package:flutter/material.dart';
+import 'package:flutter/widgets.dart';
 
 class AppIconImage extends ImageProvider<AppIconImageKey> {
   const AppIconImage({

lib/image_providers/region_provider.dart

@@ -2,10 +2,9 @@ import 'dart:async';
 import 'dart:math';
 import 'dart:ui' as ui show Codec;
 
-import 'package:aves/model/image_entry.dart';
 import 'package:aves/services/image_file_service.dart';
 import 'package:flutter/foundation.dart';
-import 'package:flutter/material.dart';
+import 'package:flutter/widgets.dart';
 
 class RegionProvider extends ImageProvider<RegionProviderKey> {
   final RegionProviderKey key;
@@ -23,7 +22,7 @@ class RegionProvider extends ImageProvider<RegionProviderKey> {
       codec: _loadAsync(key, decode),
       scale: key.scale,
       informationCollector: () sync* {
-        yield ErrorDescription('uri=${key.uri}, regionRect=${key.regionRect}');
+        yield ErrorDescription('uri=${key.uri}, pageId=${key.pageId}, mimeType=${key.mimeType}, region=${key.region}');
       },
     );
   }
@@ -31,6 +30,7 @@ class RegionProvider extends ImageProvider<RegionProviderKey> {
   Future<ui.Codec> _loadAsync(RegionProviderKey key, DecoderCallback decode) async {
     final uri = key.uri;
     final mimeType = key.mimeType;
+    final pageId = key.pageId;
     try {
       final bytes = await ImageFileService.getRegion(
         uri,
@@ -38,9 +38,9 @@ class RegionProvider extends ImageProvider<RegionProviderKey> {
         key.rotationDegrees,
         key.isFlipped,
         key.sampleSize,
-        key.regionRect,
+        key.region,
         key.imageSize,
-        page: key.page,
+        pageId: pageId,
         taskKey: key,
       );
       if (bytes == null) {
@@ -49,7 +49,7 @@ class RegionProvider extends ImageProvider<RegionProviderKey> {
       return await decode(bytes);
     } catch (error) {
       debugPrint('$runtimeType _loadAsync failed with mimeType=$mimeType, uri=$uri, error=$error');
-      throw StateError('$mimeType region decoding failed');
+      throw StateError('$mimeType region decoding failed (page $pageId)');
     }
   }
 
@@ -63,21 +63,23 @@ class RegionProvider extends ImageProvider<RegionProviderKey> {
 }
 
 class RegionProviderKey {
+  // do not store the entry as it is, because the key should be constant
+  // but the entry attributes may change over time
   final String uri, mimeType;
-  final int rotationDegrees, sampleSize, page;
+  final int pageId, rotationDegrees, sampleSize;
   final bool isFlipped;
-  final Rectangle<int> regionRect;
+  final Rectangle<int> region;
   final Size imageSize;
   final double scale;
 
   const RegionProviderKey({
     @required this.uri,
     @required this.mimeType,
+    @required this.pageId,
     @required this.rotationDegrees,
     @required this.isFlipped,
-    this.page = 0,
     @required this.sampleSize,
-    @required this.regionRect,
+    @required this.region,
     @required this.imageSize,
     this.scale = 1.0,
   })  : assert(uri != null),
@@ -85,49 +87,29 @@ class RegionProviderKey {
         assert(rotationDegrees != null),
         assert(isFlipped != null),
         assert(sampleSize != null),
-        assert(regionRect != null),
+        assert(region != null),
         assert(imageSize != null),
         assert(scale != null);
 
-  // do not store the entry as it is, because the key should be constant
-  // but the entry attributes may change over time
-  factory RegionProviderKey.fromEntry(
-    ImageEntry entry, {
-    int page = 0,
-    @required int sampleSize,
-    @required Rectangle<int> rect,
-  }) {
-    return RegionProviderKey(
-      uri: entry.uri,
-      mimeType: entry.mimeType,
-      rotationDegrees: entry.rotationDegrees,
-      isFlipped: entry.isFlipped,
-      page: page,
-      sampleSize: sampleSize,
-      regionRect: rect,
-      imageSize: Size(entry.width.toDouble(), entry.height.toDouble()),
-    );
-  }
-
   @override
   bool operator ==(Object other) {
     if (other.runtimeType != runtimeType) return false;
-    return other is RegionProviderKey && other.uri == uri && other.mimeType == mimeType && other.rotationDegrees == rotationDegrees && other.isFlipped == isFlipped && other.page == page && other.sampleSize == sampleSize && other.regionRect == regionRect && other.imageSize == imageSize && other.scale == scale;
+    return other is RegionProviderKey && other.uri == uri && other.mimeType == mimeType && other.pageId == pageId && other.rotationDegrees == rotationDegrees && other.isFlipped == isFlipped && other.sampleSize == sampleSize && other.region == region && other.imageSize == imageSize && other.scale == scale;
   }
 
   @override
   int get hashCode => hashValues(
         uri,
         mimeType,
+        pageId,
         rotationDegrees,
         isFlipped,
-        page,
         sampleSize,
-        regionRect,
+        region,
         imageSize,
         scale,
       );
 
   @override
-  String toString() => '$runtimeType#${shortHash(this)}{uri=$uri, mimeType=$mimeType, rotationDegrees=$rotationDegrees, isFlipped=$isFlipped, page=$page, sampleSize=$sampleSize, regionRect=$regionRect, imageSize=$imageSize, scale=$scale}';
+  String toString() => '$runtimeType#${shortHash(this)}{uri=$uri, mimeType=$mimeType, pageId=$pageId, rotationDegrees=$rotationDegrees, isFlipped=$isFlipped, sampleSize=$sampleSize, region=$region, imageSize=$imageSize, scale=$scale}';
 }

lib/image_providers/thumbnail_provider.dart

@@ -1,9 +1,8 @@
 import 'dart:ui' as ui show Codec;
 
-import 'package:aves/model/image_entry.dart';
 import 'package:aves/services/image_file_service.dart';
 import 'package:flutter/foundation.dart';
-import 'package:flutter/material.dart';
+import 'package:flutter/widgets.dart';
 
 class ThumbnailProvider extends ImageProvider<ThumbnailProviderKey> {
   final ThumbnailProviderKey key;
@@ -24,7 +23,7 @@ class ThumbnailProvider extends ImageProvider<ThumbnailProviderKey> {
       codec: _loadAsync(key, decode),
       scale: key.scale,
       informationCollector: () sync* {
-        yield ErrorDescription('uri=${key.uri}, extent=${key.extent}');
+        yield ErrorDescription('uri=${key.uri}, pageId=${key.pageId}, mimeType=${key.mimeType}, extent=${key.extent}');
       },
     );
   }
@@ -32,16 +31,16 @@ class ThumbnailProvider extends ImageProvider<ThumbnailProviderKey> {
   Future<ui.Codec> _loadAsync(ThumbnailProviderKey key, DecoderCallback decode) async {
     final uri = key.uri;
     final mimeType = key.mimeType;
+    final pageId = key.pageId;
     try {
       final bytes = await ImageFileService.getThumbnail(
-        uri,
-        mimeType,
-        key.dateModifiedSecs,
-        key.rotationDegrees,
-        key.isFlipped,
-        key.extent,
-        key.extent,
-        page: key.page,
+        uri: uri,
+        mimeType: mimeType,
+        pageId: pageId,
+        rotationDegrees: key.rotationDegrees,
+        isFlipped: key.isFlipped,
+        dateModifiedSecs: key.dateModifiedSecs,
+        extent: key.extent,
         taskKey: key,
       );
       if (bytes == null) {
@@ -50,7 +49,7 @@ class ThumbnailProvider extends ImageProvider<ThumbnailProviderKey> {
       return await decode(bytes);
     } catch (error) {
       debugPrint('$runtimeType _loadAsync failed with uri=$uri, error=$error');
-      throw StateError('$mimeType decoding failed');
+      throw StateError('$mimeType decoding failed (page $pageId)');
     }
   }
 
@@ -64,61 +63,49 @@ class ThumbnailProvider extends ImageProvider<ThumbnailProviderKey> {
 }
 
 class ThumbnailProviderKey {
+  // do not store the entry as it is, because the key should be constant
+  // but the entry attributes may change over time
   final String uri, mimeType;
-  final int dateModifiedSecs, rotationDegrees, page;
+  final int pageId, rotationDegrees;
   final bool isFlipped;
+  final int dateModifiedSecs;
   final double extent, scale;
 
   const ThumbnailProviderKey({
     @required this.uri,
     @required this.mimeType,
-    @required this.dateModifiedSecs,
+    @required this.pageId,
     @required this.rotationDegrees,
     @required this.isFlipped,
-    this.page = 0,
+    @required this.dateModifiedSecs,
     this.extent = 0,
     this.scale = 1,
   })  : assert(uri != null),
         assert(mimeType != null),
-        assert(dateModifiedSecs != null),
         assert(rotationDegrees != null),
         assert(isFlipped != null),
+        assert(dateModifiedSecs != null),
         assert(extent != null),
         assert(scale != null);
 
-  // do not store the entry as it is, because the key should be constant
-  // but the entry attributes may change over time
-  factory ThumbnailProviderKey.fromEntry(ImageEntry entry, {int page = 0, double extent = 0}) {
-    return ThumbnailProviderKey(
-      uri: entry.uri,
-      mimeType: entry.mimeType,
-      // `dateModifiedSecs` can be missing in viewer mode
-      dateModifiedSecs: entry.dateModifiedSecs ?? -1,
-      rotationDegrees: entry.rotationDegrees,
-      isFlipped: entry.isFlipped,
-      page: page,
-      extent: extent,
-    );
-  }
-
   @override
   bool operator ==(Object other) {
     if (other.runtimeType != runtimeType) return false;
-    return other is ThumbnailProviderKey && other.uri == uri && other.extent == extent && other.mimeType == mimeType && other.dateModifiedSecs == dateModifiedSecs && other.rotationDegrees == rotationDegrees && other.isFlipped == isFlipped && other.page == page && other.scale == scale;
+    return other is ThumbnailProviderKey && other.uri == uri && other.mimeType == mimeType && other.pageId == pageId && other.rotationDegrees == rotationDegrees && other.isFlipped == isFlipped && other.dateModifiedSecs == dateModifiedSecs && other.extent == extent && other.scale == scale;
   }
 
   @override
   int get hashCode => hashValues(
         uri,
         mimeType,
-        dateModifiedSecs,
+        pageId,
         rotationDegrees,
         isFlipped,
-        page,
+        dateModifiedSecs,
         extent,
         scale,
       );
 
   @override
-  String toString() => '$runtimeType#${shortHash(this)}{uri=$uri, mimeType=$mimeType, dateModifiedSecs=$dateModifiedSecs, rotationDegrees=$rotationDegrees, isFlipped=$isFlipped, page=$page, extent=$extent, scale=$scale}';
+  String toString() => '$runtimeType#${shortHash(this)}{uri=$uri, mimeType=$mimeType, pageId=$pageId, rotationDegrees=$rotationDegrees, isFlipped=$isFlipped, dateModifiedSecs=$dateModifiedSecs, extent=$extent, scale=$scale}';
 }

lib/image_providers/uri_image_provider.dart

@@ -3,19 +3,19 @@ import 'dart:ui' as ui show Codec;
 
 import 'package:aves/services/image_file_service.dart';
 import 'package:flutter/foundation.dart';
-import 'package:flutter/material.dart';
+import 'package:flutter/widgets.dart';
 import 'package:pedantic/pedantic.dart';
 
 class UriImage extends ImageProvider<UriImage> {
   final String uri, mimeType;
-  final int page, rotationDegrees, expectedContentLength;
+  final int pageId, rotationDegrees, expectedContentLength;
   final bool isFlipped;
   final double scale;
 
   const UriImage({
     @required this.uri,
     @required this.mimeType,
-    this.page = 0,
+    @required this.pageId,
     @required this.rotationDegrees,
     @required this.isFlipped,
     this.expectedContentLength,
@@ -37,7 +37,7 @@ class UriImage extends ImageProvider<UriImage> {
       scale: key.scale,
       chunkEvents: chunkEvents.stream,
       informationCollector: () sync* {
-        yield ErrorDescription('uri=$uri, mimeType=$mimeType');
+        yield ErrorDescription('uri=$uri, pageId=$pageId, mimeType=$mimeType');
       },
     );
   }
@@ -51,7 +51,7 @@ class UriImage extends ImageProvider<UriImage> {
         mimeType,
         rotationDegrees,
         isFlipped,
-        page: page,
+        pageId: pageId,
         expectedContentLength: expectedContentLength,
         onBytesReceived: (cumulative, total) {
           chunkEvents.add(ImageChunkEvent(
@@ -66,7 +66,7 @@ class UriImage extends ImageProvider<UriImage> {
       return await decode(bytes);
     } catch (error) {
       debugPrint('$runtimeType _loadAsync failed with mimeType=$mimeType, uri=$uri, error=$error');
-      throw StateError('$mimeType decoding failed');
+      throw StateError('$mimeType decoding failed (page $pageId)');
     } finally {
       unawaited(chunkEvents.close());
     }
@@ -75,7 +75,7 @@ class UriImage extends ImageProvider<UriImage> {
   @override
   bool operator ==(Object other) {
     if (other.runtimeType != runtimeType) return false;
-    return other is UriImage && other.uri == uri && other.mimeType == mimeType && other.rotationDegrees == rotationDegrees && other.isFlipped == isFlipped && other.page == page && other.scale == scale;
+    return other is UriImage && other.uri == uri && other.mimeType == mimeType && other.rotationDegrees == rotationDegrees && other.isFlipped == isFlipped && other.pageId == pageId && other.scale == scale;
   }
 
   @override
@@ -84,10 +84,10 @@ class UriImage extends ImageProvider<UriImage> {
         mimeType,
         rotationDegrees,
         isFlipped,
-        page,
+        pageId,
         scale,
       );
 
   @override
-  String toString() => '$runtimeType#${shortHash(this)}{uri=$uri, mimeType=$mimeType, rotationDegrees=$rotationDegrees, isFlipped=$isFlipped, page=$page, scale=$scale}';
+  String toString() => '$runtimeType#${shortHash(this)}{uri=$uri, mimeType=$mimeType, rotationDegrees=$rotationDegrees, isFlipped=$isFlipped, pageId=$pageId, scale=$scale}';
 }

lib/image_providers/uri_picture_provider.dart

@@ -1,6 +1,6 @@
 import 'package:aves/services/image_file_service.dart';
 import 'package:flutter/foundation.dart';
-import 'package:flutter/material.dart';
+import 'package:flutter/widgets.dart';
 import 'package:flutter_svg/flutter_svg.dart';
 import 'package:pedantic/pedantic.dart';
 
@@ -30,7 +30,7 @@ class UriPicture extends PictureProvider<UriPicture> {
   Future<PictureInfo> _loadAsync(UriPicture key, {PictureErrorListener onError}) async {
     assert(key == this);
 
-    final data = await ImageFileService.getImage(uri, mimeType, 0, false);
+    final data = await ImageFileService.getSvg(uri, mimeType);
     if (data == null || data.isEmpty) {
       return null;
     }

lib/main.dart

@@ -2,10 +2,13 @@ import 'dart:isolate';
 import 'dart:ui';
 
 import 'package:aves/model/settings/settings.dart';
+import 'package:aves/model/source/collection_source.dart';
+import 'package:aves/model/source/media_store_source.dart';
+import 'package:aves/theme/durations.dart';
 import 'package:aves/theme/icons.dart';
+import 'package:aves/utils/debouncer.dart';
 import 'package:aves/widgets/common/behaviour/route_tracker.dart';
 import 'package:aves/widgets/common/behaviour/routes.dart';
-import 'package:aves/widgets/common/providers/settings_provider.dart';
 import 'package:aves/widgets/home_page.dart';
 import 'package:aves/widgets/welcome_page.dart';
 import 'package:firebase_analytics/firebase_analytics.dart';
@@ -16,6 +19,7 @@ import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
 import 'package:overlay_support/overlay_support.dart';
+import 'package:provider/provider.dart';
 
 void main() {
 //  HttpClient.enableTimelineLogging = true; // enable network traffic logging
@@ -43,12 +47,16 @@ class AvesApp extends StatefulWidget {
 
 class _AvesAppState extends State<AvesApp> {
   Future<void> _appSetup;
+  final _mediaStoreSource = MediaStoreSource();
+  final Debouncer _contentChangeDebouncer = Debouncer(delay: Durations.contentChangeDebounceDelay);
+  final List<String> changedUris = [];
 
   // observers are not registered when using the same list object with different items
   // the list itself needs to be reassigned
   List<NavigatorObserver> _navigatorObservers = [];
-  final _newIntentChannel = EventChannel('deckers.thibault/aves/intent');
-  final _navigatorKey = GlobalKey<NavigatorState>();
+  final EventChannel _contentChangeChannel = EventChannel('deckers.thibault/aves/contentchange');
+  final EventChannel _newIntentChannel = EventChannel('deckers.thibault/aves/intent');
+  final GlobalKey<NavigatorState> _navigatorKey = GlobalKey(debugLabel: 'app-navigator');
 
   static const accentColor = Colors.indigoAccent;
 
@@ -94,9 +102,57 @@ class _AvesAppState extends State<AvesApp> {
   void initState() {
     super.initState();
     _appSetup = _setup();
+    _contentChangeChannel.receiveBroadcastStream().listen((event) => _onContentChange(event as String));
     _newIntentChannel.receiveBroadcastStream().listen((event) => _onNewIntent(event as Map));
   }
 
+  @override
+  Widget build(BuildContext context) {
+    // place the settings provider above `MaterialApp`
+    // so it can be used during navigation transitions
+    return ChangeNotifierProvider<Settings>.value(
+      value: settings,
+      child: Provider<CollectionSource>.value(
+        value: _mediaStoreSource,
+        child: OverlaySupport(
+          child: FutureBuilder<void>(
+            future: _appSetup,
+            builder: (context, snapshot) {
+              final home = (!snapshot.hasError && snapshot.connectionState == ConnectionState.done)
+                  ? getFirstPage()
+                  : Scaffold(
+                      body: snapshot.hasError ? _buildError(snapshot.error) : SizedBox.shrink(),
+                    );
+              return MaterialApp(
+                navigatorKey: _navigatorKey,
+                home: home,
+                navigatorObservers: _navigatorObservers,
+                title: 'Aves',
+                darkTheme: darkTheme,
+                themeMode: ThemeMode.dark,
+              );
+            },
+          ),
+        ),
+      ),
+    );
+  }
+
+  Widget _buildError(Object error) {
+    return Container(
+      alignment: Alignment.center,
+      padding: EdgeInsets.all(16),
+      child: Column(
+        mainAxisSize: MainAxisSize.min,
+        children: [
+          Icon(AIcons.error),
+          SizedBox(height: 16),
+          Text(error.toString()),
+        ],
+      ),
+    );
+  }
+
   Future<void> _setup() async {
     await Firebase.initializeApp().then((app) {
       final crashlytics = FirebaseCrashlytics.instance;
@@ -133,46 +189,11 @@ class _AvesAppState extends State<AvesApp> {
     ));
   }
 
-  @override
-  Widget build(BuildContext context) {
-    // place the settings provider above `MaterialApp`
-    // so it can be used during navigation transitions
-    return SettingsProvider(
-      child: OverlaySupport(
-        child: FutureBuilder<void>(
-          future: _appSetup,
-          builder: (context, snapshot) {
-            final home = (!snapshot.hasError && snapshot.connectionState == ConnectionState.done)
-                ? getFirstPage()
-                : Scaffold(
-                    body: snapshot.hasError ? _buildError(snapshot.error) : SizedBox.shrink(),
-                  );
-            return MaterialApp(
-              navigatorKey: _navigatorKey,
-              home: home,
-              navigatorObservers: _navigatorObservers,
-              title: 'Aves',
-              darkTheme: darkTheme,
-              themeMode: ThemeMode.dark,
-            );
-          },
-        ),
-      ),
-    );
-  }
-
-  Widget _buildError(Object error) {
-    return Container(
-      alignment: Alignment.center,
-      padding: EdgeInsets.all(16),
-      child: Column(
-        mainAxisSize: MainAxisSize.min,
-        children: [
-          Icon(AIcons.error),
-          SizedBox(height: 16),
-          Text(error.toString()),
-        ],
-      ),
-    );
+  void _onContentChange(String uri) {
+    changedUris.add(uri);
+    _contentChangeDebouncer(() {
+      _mediaStoreSource.refreshUris(List.of(changedUris));
+      changedUris.clear();
+    });
   }
 }

lib/model/actions/entry_actions.dart

@@ -4,6 +4,7 @@ import 'package:flutter/widgets.dart';
 enum EntryAction {
   delete,
   edit,
+  export,
   flip,
   info,
   open,
@@ -31,6 +32,7 @@ class EntryActions {
     EntryAction.share,
     EntryAction.delete,
     EntryAction.rename,
+    EntryAction.export,
     EntryAction.print,
     EntryAction.viewSource,
   ];
@@ -52,6 +54,8 @@ extension ExtraEntryAction on EntryAction {
         return null;
       case EntryAction.delete:
         return 'Delete';
+      case EntryAction.export:
+        return 'Export';
       case EntryAction.info:
         return 'Info';
       case EntryAction.rename:
@@ -91,6 +95,8 @@ extension ExtraEntryAction on EntryAction {
         return null;
       case EntryAction.delete:
         return AIcons.delete;
+      case EntryAction.export:
+        return AIcons.export;
       case EntryAction.info:
         return AIcons.info;
       case EntryAction.rename:

lib/model/actions/move_type.dart

@@ -0,0 +1 @@
+enum MoveType { copy, move, export }

lib/model/connectivity.dart

@@ -0,0 +1,28 @@
+import 'package:connectivity/connectivity.dart';
+import 'package:flutter/foundation.dart';
+
+final AvesConnectivity connectivity = AvesConnectivity._private();
+
+class AvesConnectivity {
+  bool _isConnected;
+
+  AvesConnectivity._private() {
+    Connectivity().onConnectivityChanged.listen(_updateFromResult);
+  }
+
+  void onResume() => _isConnected = null;
+
+  Future<bool> get isConnected async {
+    if (_isConnected != null) return SynchronousFuture(_isConnected);
+    final result = await (Connectivity().checkConnectivity());
+    _updateFromResult(result);
+    return _isConnected;
+  }
+
+  Future<bool> get canGeolocate => isConnected;
+
+  void _updateFromResult(ConnectivityResult result) {
+    _isConnected = result != ConnectivityResult.none;
+    debugPrint('Device is connected=$_isConnected');
+  }
+}

lib/model/entry.dart

@@ -2,7 +2,7 @@ import 'dart:async';
 
 import 'package:aves/model/entry_cache.dart';
 import 'package:aves/model/favourite_repo.dart';
-import 'package:aves/model/image_metadata.dart';
+import 'package:aves/model/metadata.dart';
 import 'package:aves/model/metadata_db.dart';
 import 'package:aves/model/multipage.dart';
 import 'package:aves/services/image_file_service.dart';
@@ -21,16 +21,18 @@ import 'package:path/path.dart' as ppath;
 
 import '../ref/mime_types.dart';
 
-class ImageEntry {
+class AvesEntry {
   String uri;
   String _path, _directory, _filename, _extension;
-  int contentId;
+  int pageId, contentId;
   final String sourceMimeType;
   int width;
   int height;
   int sourceRotationDegrees;
   final int sizeBytes;
   String sourceTitle;
+
+  // `dateModifiedSecs` can be missing in viewer mode
   int _dateModifiedSecs;
   final int sourceDateTakenMillis;
   final int durationMillis;
@@ -43,10 +45,11 @@ class ImageEntry {
   // TODO TLAD make it dynamic if it depends on OS/lib versions
   static const List<String> undecodable = [MimeTypes.crw, MimeTypes.psd];
 
-  ImageEntry({
+  AvesEntry({
     this.uri,
     String path,
     this.contentId,
+    this.pageId,
     this.sourceMimeType,
     @required this.width,
     @required this.height,
@@ -66,14 +69,14 @@ class ImageEntry {
 
   bool get canHaveAlpha => MimeTypes.alphaImages.contains(mimeType);
 
-  ImageEntry copyWith({
+  AvesEntry copyWith({
     @required String uri,
     @required String path,
     @required int contentId,
     @required int dateModifiedSecs,
   }) {
     final copyContentId = contentId ?? this.contentId;
-    final copied = ImageEntry(
+    final copied = AvesEntry(
       uri: uri ?? uri,
       path: path ?? this.path,
       contentId: copyContentId,
@@ -93,9 +96,39 @@ class ImageEntry {
     return copied;
   }
 
+  AvesEntry getPageEntry(SinglePageInfo pageInfo, {bool eraseDefaultPageId = true}) {
+    if (pageInfo == null) return this;
+
+    // do not provide the page ID for the default page,
+    // so that we can treat this page like the main entry
+    // and retrieve cached images for it
+    final pageId = eraseDefaultPageId && pageInfo.isDefault ? null : pageInfo.pageId;
+
+    return AvesEntry(
+      uri: uri,
+      path: path,
+      contentId: contentId,
+      pageId: pageId,
+      sourceMimeType: pageInfo.mimeType ?? sourceMimeType,
+      width: pageInfo.width ?? width,
+      height: pageInfo.height ?? height,
+      sourceRotationDegrees: sourceRotationDegrees,
+      sizeBytes: sizeBytes,
+      sourceTitle: sourceTitle,
+      dateModifiedSecs: dateModifiedSecs,
+      sourceDateTakenMillis: sourceDateTakenMillis,
+      durationMillis: pageInfo.durationMillis ?? durationMillis,
+    )
+      ..catalogMetadata = _catalogMetadata?.copyWith(
+        mimeType: pageInfo.mimeType,
+        isMultipage: false,
+      )
+      ..addressDetails = _addressDetails?.copyWith();
+  }
+
   // from DB or platform source entry
-  factory ImageEntry.fromMap(Map map) {
-    return ImageEntry(
+  factory AvesEntry.fromMap(Map map) {
+    return AvesEntry(
       uri: map['uri'] as String,
       path: map['path'] as String,
       contentId: map['contentId'] as int,
@@ -136,7 +169,7 @@ class ImageEntry {
   }
 
   @override
-  String toString() => '$runtimeType#${shortHash(this)}{uri=$uri, path=$path}';
+  String toString() => '$runtimeType#${shortHash(this)}{uri=$uri, path=$path, pageId=$pageId}';
 
   set path(String path) {
     _path = path;
@@ -196,7 +229,11 @@ class ImageEntry {
       ].contains(mimeType) &&
       !isAnimated;
 
-  bool get canTile => _supportedByBitmapRegionDecoder || mimeType == MimeTypes.tiff;
+  bool get supportTiling => _supportedByBitmapRegionDecoder || mimeType == MimeTypes.tiff;
+
+  // as of panorama v0.3.1, the `Panorama` widget throws on initialization when the image is already resolved
+  // so we use tiles for panoramas as a workaround to not collide with the `panorama` package resolution
+  bool get useTiles => supportTiling && (width > 4096 || height > 4096 || is360);
 
   bool get isRaw => MimeTypes.rawImages.contains(mimeType);
 
@@ -216,8 +253,6 @@ class ImageEntry {
 
   bool get canEdit => path != null;
 
-  bool get canPrint => !isVideo;
-
   bool get canRotateAndFlip => canEdit && canEditExif;
 
   // support for writing EXIF
@@ -233,29 +268,21 @@ class ImageEntry {
     }
   }
 
-  // The additional comparison of width to height is a workaround for badly registered entries.
-  // e.g. a portrait FHD video should be registered as width=1920, height=1080, orientation=90,
-  // but is incorrectly registered in the Media Store as width=1080, height=1920, orientation=0
-  // Double-checking the width/height during loading or cataloguing is the proper solution,
-  // but it would take space and time, so a basic workaround will do.
-  bool get isPortrait => rotationDegrees % 180 == 90 && (catalogMetadata?.rotationDegrees == null || width > height);
+  // Media Store size/rotation is inaccurate, e.g. a portrait FHD video is rotated according to its metadata,
+  // so it should be registered as width=1920, height=1080, orientation=90,
+  // but is incorrectly registered as width=1080, height=1920, orientation=0.
+  // Double-checking the width/height during loading or cataloguing is the proper solution, but it would take space and time.
+  // Comparing width and height can help with the portrait FHD video example,
+  // but it fails for a portrait screenshot rotated, which is landscape with width=1080, height=1920, orientation=90
+  bool get isRotated => rotationDegrees % 180 == 90;
 
   static const ratioSeparator = '\u2236';
   static const resolutionSeparator = ' \u00D7 ';
 
-  String getResolutionText({MultiPageInfo multiPageInfo, int page}) {
-    int w;
-    int h;
-    if (multiPageInfo != null && page != null) {
-      final pageInfo = multiPageInfo.pages[page];
-      w = pageInfo?.width;
-      h = pageInfo?.height;
-    }
-    w ??= width;
-    h ??= height;
-    final ws = w ?? '?';
-    final hs = h ?? '?';
-    return isPortrait ? '$hs$resolutionSeparator$ws' : '$ws$resolutionSeparator$hs';
+  String get resolutionText {
+    final ws = width ?? '?';
+    final hs = height ?? '?';
+    return isRotated ? '$hs$resolutionSeparator$ws' : '$ws$resolutionSeparator$hs';
   }
 
   String get aspectRatioText {
@@ -263,7 +290,7 @@ class ImageEntry {
       final gcd = width.gcd(height);
       final w = width ~/ gcd;
       final h = height ~/ gcd;
-      return isPortrait ? '$h$ratioSeparator$w' : '$w$ratioSeparator$h';
+      return isRotated ? '$h$ratioSeparator$w' : '$w$ratioSeparator$h';
     } else {
       return '?$ratioSeparator?';
     }
@@ -271,20 +298,13 @@ class ImageEntry {
 
   double get displayAspectRatio {
     if (width == 0 || height == 0) return 1;
-    return isPortrait ? height / width : width / height;
+    return isRotated ? height / width : width / height;
   }
 
-  Size getDisplaySize({MultiPageInfo multiPageInfo, int page}) {
-    int w;
-    int h;
-    if (multiPageInfo != null && page != null) {
-      final pageInfo = multiPageInfo.pages[page];
-      w = pageInfo?.width;
-      h = pageInfo?.height;
-    }
-    w ??= width;
-    h ??= height;
-    return isPortrait ? Size(h.toDouble(), w.toDouble()) : Size(w.toDouble(), h.toDouble());
+  Size get displaySize {
+    final w = width.toDouble();
+    final h = height.toDouble();
+    return isRotated ? Size(h, w) : Size(w, h);
   }
 
   int get megaPixels => width != null && height != null ? (width * height / 1000000).round() : null;
@@ -598,7 +618,7 @@ class ImageEntry {
   // compare by:
   // 1) title ascending
   // 2) extension ascending
-  static int compareByName(ImageEntry a, ImageEntry b) {
+  static int compareByName(AvesEntry a, AvesEntry b) {
     final c = compareAsciiUpperCase(a.bestTitle, b.bestTitle);
     return c != 0 ? c : compareAsciiUpperCase(a.extension, b.extension);
   }
@@ -606,7 +626,7 @@ class ImageEntry {
   // compare by:
   // 1) size descending
   // 2) name ascending
-  static int compareBySize(ImageEntry a, ImageEntry b) {
+  static int compareBySize(AvesEntry a, AvesEntry b) {
     final c = b.sizeBytes.compareTo(a.sizeBytes);
     return c != 0 ? c : compareByName(a, b);
   }
@@ -615,9 +635,12 @@ class ImageEntry {
 
   // compare by:
   // 1) date descending
-  // 2) name ascending
-  static int compareByDate(ImageEntry a, ImageEntry b) {
-    final c = (b.bestDate ?? _epoch).compareTo(a.bestDate ?? _epoch);
-    return c != 0 ? c : compareByName(a, b);
+  // 2) name descending
+  static int compareByDate(AvesEntry a, AvesEntry b) {
+    var c = (b.bestDate ?? _epoch).compareTo(a.bestDate ?? _epoch);
+    if (c != 0) return c;
+    c = (b.dateModifiedSecs ?? 0).compareTo(a.dateModifiedSecs ?? 0);
+    if (c != 0) return c;
+    return -compareByName(a, b);
   }
 }

lib/model/entry_cache.dart

@@ -12,14 +12,14 @@ class EntryCache {
     int oldRotationDegrees,
     bool oldIsFlipped,
   ) async {
-    // TODO TLAD revisit this for multipage items, if someday image editing features are added for them
-    const page = 0;
+    // TODO TLAD provide pageId parameter for multipage items, if someday image editing features are added for them
+    int pageId;
 
     // evict fullscreen image
     await UriImage(
       uri: uri,
       mimeType: mimeType,
-      page: page,
+      pageId: pageId,
       rotationDegrees: oldRotationDegrees,
       isFlipped: oldIsFlipped,
     ).evict();
@@ -28,10 +28,10 @@ class EntryCache {
     await ThumbnailProvider(ThumbnailProviderKey(
       uri: uri,
       mimeType: mimeType,
+      pageId: pageId,
       dateModifiedSecs: dateModifiedSecs,
       rotationDegrees: oldRotationDegrees,
       isFlipped: oldIsFlipped,
-      page: page,
     )).evict();
 
     // evict higher quality thumbnails (with powers of 2 from 32 to 1024 as specified extents)
@@ -41,10 +41,10 @@ class EntryCache {
         (extent) => ThumbnailProvider(ThumbnailProviderKey(
               uri: uri,
               mimeType: mimeType,
+              pageId: pageId,
               dateModifiedSecs: dateModifiedSecs,
               rotationDegrees: oldRotationDegrees,
               isFlipped: oldIsFlipped,
-              page: page,
               extent: extent,
             )).evict());
   }

lib/model/entry_images.dart

@@ -0,0 +1,67 @@
+import 'dart:math';
+import 'dart:ui';
+
+import 'package:aves/image_providers/region_provider.dart';
+import 'package:aves/image_providers/thumbnail_provider.dart';
+import 'package:aves/image_providers/uri_image_provider.dart';
+import 'package:aves/model/entry.dart';
+import 'package:flutter/foundation.dart';
+import 'package:flutter/widgets.dart';
+
+extension ExtraAvesEntry on AvesEntry {
+  ThumbnailProvider getThumbnail({double extent = 0}) {
+    return ThumbnailProvider(_getThumbnailProviderKey(extent));
+  }
+
+  ThumbnailProviderKey _getThumbnailProviderKey(double extent) {
+    // we standardize the thumbnail loading dimension by taking the nearest larger power of 2
+    // so that there are less variants of the thumbnails to load and cache
+    // it increases the chance of cache hit when loading similarly sized columns (e.g. on orientation change)
+    final requestExtent = extent == 0 ? .0 : pow(2, (log(extent) / log(2)).ceil()).toDouble();
+
+    return ThumbnailProviderKey(
+      uri: uri,
+      mimeType: mimeType,
+      pageId: pageId,
+      rotationDegrees: rotationDegrees,
+      isFlipped: isFlipped,
+      dateModifiedSecs: dateModifiedSecs ?? -1,
+      extent: requestExtent,
+    );
+  }
+
+  RegionProvider getRegion({@required int sampleSize, Rectangle<int> region}) {
+    return RegionProvider(_getRegionProviderKey(sampleSize, region));
+  }
+
+  RegionProviderKey _getRegionProviderKey(int sampleSize, Rectangle<int> region) {
+    return RegionProviderKey(
+      uri: uri,
+      mimeType: mimeType,
+      pageId: pageId,
+      rotationDegrees: rotationDegrees,
+      isFlipped: isFlipped,
+      sampleSize: sampleSize,
+      region: region ?? Rectangle<int>(0, 0, width, height),
+      imageSize: Size(width.toDouble(), height.toDouble()),
+    );
+  }
+
+  UriImage get uriImage => UriImage(
+        uri: uri,
+        mimeType: mimeType,
+        pageId: pageId,
+        rotationDegrees: rotationDegrees,
+        isFlipped: isFlipped,
+        expectedContentLength: sizeBytes,
+      );
+
+  bool _isReady(Object providerKey) => imageCache.statusForKey(providerKey).keepAlive;
+
+  ImageProvider getBestThumbnail(double extent) {
+    final sizedThumbnailKey = _getThumbnailProviderKey(extent);
+    if (_isReady(sizedThumbnailKey)) return ThumbnailProvider(sizedThumbnailKey);
+
+    return getThumbnail();
+  }
+}

lib/model/favourite_repo.dart

@@ -1,5 +1,5 @@
-import 'package:aves/model/image_entry.dart';
-import 'package:aves/model/image_metadata.dart';
+import 'package:aves/model/entry.dart';
+import 'package:aves/model/metadata.dart';
 import 'package:aves/model/metadata_db.dart';
 import 'package:aves/utils/change_notifier.dart';
 
@@ -18,25 +18,25 @@ class FavouriteRepo {
 
   int get count => _rows.length;
 
-  bool isFavourite(ImageEntry entry) => _rows.any((row) => row.contentId == entry.contentId);
+  bool isFavourite(AvesEntry entry) => _rows.any((row) => row.contentId == entry.contentId);
 
-  FavouriteRow _entryToRow(ImageEntry entry) => FavouriteRow(contentId: entry.contentId, path: entry.path);
+  FavouriteRow _entryToRow(AvesEntry entry) => FavouriteRow(contentId: entry.contentId, path: entry.path);
 
-  Future<void> add(Iterable<ImageEntry> entries) async {
+  Future<void> add(Iterable<AvesEntry> entries) async {
     final newRows = entries.map(_entryToRow);
     await metadataDb.addFavourites(newRows);
     _rows.addAll(newRows);
     changeNotifier.notifyListeners();
   }
 
-  Future<void> remove(Iterable<ImageEntry> entries) async {
+  Future<void> remove(Iterable<AvesEntry> entries) async {
     final removedRows = entries.map(_entryToRow);
     await metadataDb.removeFavourites(removedRows);
     removedRows.forEach(_rows.remove);
     changeNotifier.notifyListeners();
   }
 
-  Future<void> move(int oldContentId, ImageEntry entry) async {
+  Future<void> move(int oldContentId, AvesEntry entry) async {
     final oldRow = _rows.firstWhere((row) => row.contentId == oldContentId, orElse: () => null);
     if (oldRow != null) {
       _rows.remove(oldRow);

lib/model/filters/album.dart

@@ -1,6 +1,6 @@
 import 'package:aves/image_providers/app_icon_image_provider.dart';
+import 'package:aves/model/entry.dart';
 import 'package:aves/model/filters/filters.dart';
-import 'package:aves/model/image_entry.dart';
 import 'package:aves/theme/icons.dart';
 import 'package:aves/utils/android_file_utils.dart';
 import 'package:aves/widgets/common/identity/aves_icons.dart';
@@ -33,7 +33,7 @@ class AlbumFilter extends CollectionFilter {
       };
 
   @override
-  bool filter(ImageEntry entry) => entry.directory == album;
+  bool filter(AvesEntry entry) => entry.directory == album;
 
   @override
   String get label => uniqueName ?? album.split(separator).last;

lib/model/filters/favourite.dart

@@ -1,5 +1,5 @@
+import 'package:aves/model/entry.dart';
 import 'package:aves/model/filters/filters.dart';
-import 'package:aves/model/image_entry.dart';
 import 'package:aves/theme/icons.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter/widgets.dart';
@@ -13,7 +13,7 @@ class FavouriteFilter extends CollectionFilter {
       };
 
   @override
-  bool filter(ImageEntry entry) => entry.isFavourite;
+  bool filter(AvesEntry entry) => entry.isFavourite;
 
   @override
   String get label => 'Favourite';

lib/model/filters/filters.dart

@@ -1,12 +1,12 @@
 import 'dart:convert';
 
+import 'package:aves/model/entry.dart';
 import 'package:aves/model/filters/album.dart';
 import 'package:aves/model/filters/favourite.dart';
 import 'package:aves/model/filters/location.dart';
 import 'package:aves/model/filters/mime.dart';
 import 'package:aves/model/filters/query.dart';
 import 'package:aves/model/filters/tag.dart';
-import 'package:aves/model/image_entry.dart';
 import 'package:aves/utils/color_utils.dart';
 import 'package:collection/collection.dart';
 import 'package:flutter/foundation.dart';
@@ -49,7 +49,7 @@ abstract class CollectionFilter implements Comparable<CollectionFilter> {
 
   String toJson() => jsonEncode(toMap());
 
-  bool filter(ImageEntry entry);
+  bool filter(AvesEntry entry);
 
   bool get isUnique => true;
 
@@ -78,7 +78,7 @@ abstract class CollectionFilter implements Comparable<CollectionFilter> {
 // TODO TLAD replace this by adding getters to CollectionFilter, with cached entry/count coming from Source
 class FilterGridItem<T extends CollectionFilter> {
   final T filter;
-  final ImageEntry entry;
+  final AvesEntry entry;
 
   const FilterGridItem(this.filter, this.entry);
 

lib/model/filters/location.dart

@@ -1,5 +1,5 @@
+import 'package:aves/model/entry.dart';
 import 'package:aves/model/filters/filters.dart';
-import 'package:aves/model/image_entry.dart';
 import 'package:aves/theme/icons.dart';
 import 'package:flutter/foundation.dart';
 import 'package:flutter/widgets.dart';
@@ -35,7 +35,7 @@ class LocationFilter extends CollectionFilter {
   String get countryNameAndCode => '$_location$locationSeparator$_countryCode';
 
   @override
-  bool filter(ImageEntry entry) => _location.isEmpty ? !entry.isLocated : entry.isLocated && ((level == LocationLevel.country && entry.addressDetails.countryCode == _countryCode) || (level == LocationLevel.place && entry.addressDetails.place == _location));
+  bool filter(AvesEntry entry) => _location.isEmpty ? !entry.isLocated : entry.isLocated && ((level == LocationLevel.country && entry.addressDetails.countryCode == _countryCode) || (level == LocationLevel.place && entry.addressDetails.place == _location));
 
   @override
   String get label => _location.isEmpty ? emptyLabel : _location;

lib/model/filters/mime.dart

@@ -1,5 +1,5 @@
 import 'package:aves/model/filters/filters.dart';
-import 'package:aves/model/image_entry.dart';
+import 'package:aves/model/entry.dart';
 import 'package:aves/theme/icons.dart';
 import 'package:aves/utils/mime_utils.dart';
 import 'package:flutter/foundation.dart';
@@ -15,7 +15,7 @@ class MimeFilter extends CollectionFilter {
   static const geotiff = 'aves/geotiff'; // subset of `image/tiff`
 
   final String mime;
-  bool Function(ImageEntry) _filter;
+  bool Function(AvesEntry) _filter;
   String _label;
   IconData _icon;
 
@@ -67,7 +67,7 @@ class MimeFilter extends CollectionFilter {
       };
 
   @override
-  bool filter(ImageEntry entry) => _filter(entry);
+  bool filter(AvesEntry entry) => _filter(entry);
 
   @override
   String get label => _label;

lib/model/filters/query.dart

@@ -1,5 +1,5 @@
+import 'package:aves/model/entry.dart';
 import 'package:aves/model/filters/filters.dart';
-import 'package:aves/model/image_entry.dart';
 import 'package:aves/theme/icons.dart';
 import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
@@ -12,7 +12,7 @@ class QueryFilter extends CollectionFilter {
 
   final String query;
   final bool colorful;
-  bool Function(ImageEntry) _filter;
+  bool Function(AvesEntry) _filter;
 
   QueryFilter(this.query, {this.colorful = true}) {
     var upQuery = query.toUpperCase();
@@ -44,7 +44,7 @@ class QueryFilter extends CollectionFilter {
       };
 
   @override
-  bool filter(ImageEntry entry) => _filter(entry);
+  bool filter(AvesEntry entry) => _filter(entry);
 
   @override
   bool get isUnique => false;

lib/model/filters/tag.dart

@@ -1,5 +1,5 @@
+import 'package:aves/model/entry.dart';
 import 'package:aves/model/filters/filters.dart';
-import 'package:aves/model/image_entry.dart';
 import 'package:aves/theme/icons.dart';
 import 'package:flutter/foundation.dart';
 import 'package:flutter/widgets.dart';
@@ -24,7 +24,7 @@ class TagFilter extends CollectionFilter {
       };
 
   @override
-  bool filter(ImageEntry entry) => tag.isEmpty ? entry.xmpSubjects.isEmpty : entry.xmpSubjects.contains(tag);
+  bool filter(AvesEntry entry) => tag.isEmpty ? entry.xmpSubjects.isEmpty : entry.xmpSubjects.contains(tag);
 
   @override
   bool get isUnique => false;

lib/model/metadata.dart

@@ -68,17 +68,19 @@ class CatalogMetadata {
   }
 
   CatalogMetadata copyWith({
-    @required int contentId,
+    int contentId,
+    String mimeType,
+    bool isMultipage,
   }) {
     return CatalogMetadata(
       contentId: contentId ?? this.contentId,
-      mimeType: mimeType,
+      mimeType: mimeType ?? this.mimeType,
       dateMillis: dateMillis,
       isAnimated: isAnimated,
       isFlipped: isFlipped,
       isGeotiff: isGeotiff,
       is360: is360,
-      isMultipage: isMultipage,
+      isMultipage: isMultipage ?? this.isMultipage,
       rotationDegrees: rotationDegrees,
       xmpSubjects: xmpSubjects,
       xmpTitleDescription: xmpTitleDescription,
@@ -169,7 +171,7 @@ class AddressDetails {
   });
 
   AddressDetails copyWith({
-    @required int contentId,
+    int contentId,
   }) {
     return AddressDetails(
       contentId: contentId ?? this.contentId,

lib/model/metadata_db.dart

@@ -1,7 +1,7 @@
 import 'dart:io';
 
-import 'package:aves/model/image_entry.dart';
-import 'package:aves/model/image_metadata.dart';
+import 'package:aves/model/entry.dart';
+import 'package:aves/model/metadata.dart';
 import 'package:aves/model/metadata_db_upgrade.dart';
 import 'package:flutter/foundation.dart';
 import 'package:path/path.dart';
@@ -116,16 +116,16 @@ class MetadataDb {
     debugPrint('$runtimeType clearEntries deleted $count entries');
   }
 
-  Future<List<ImageEntry>> loadEntries() async {
+  Future<List<AvesEntry>> loadEntries() async {
     final stopwatch = Stopwatch()..start();
     final db = await _database;
     final maps = await db.query(entryTable);
-    final entries = maps.map((map) => ImageEntry.fromMap(map)).toList();
+    final entries = maps.map((map) => AvesEntry.fromMap(map)).toList();
     debugPrint('$runtimeType loadEntries complete in ${stopwatch.elapsed.inMilliseconds}ms for ${entries.length} entries');
     return entries;
   }
 
-  Future<void> saveEntries(Iterable<ImageEntry> entries) async {
+  Future<void> saveEntries(Iterable<AvesEntry> entries) async {
     if (entries == null || entries.isEmpty) return;
     final stopwatch = Stopwatch()..start();
     final db = await _database;
@@ -135,7 +135,7 @@ class MetadataDb {
     debugPrint('$runtimeType saveEntries complete in ${stopwatch.elapsed.inMilliseconds}ms for ${entries.length} entries');
   }
 
-  Future<void> updateEntryId(int oldId, ImageEntry entry) async {
+  Future<void> updateEntryId(int oldId, AvesEntry entry) async {
     final db = await _database;
     final batch = db.batch();
     batch.delete(entryTable, where: 'contentId = ?', whereArgs: [oldId]);
@@ -143,7 +143,7 @@ class MetadataDb {
     await batch.commit(noResult: true);
   }
 
-  void _batchInsertEntry(Batch batch, ImageEntry entry) {
+  void _batchInsertEntry(Batch batch, AvesEntry entry) {
     if (entry == null) return;
     batch.insert(
       entryTable,

lib/model/multipage.dart

@@ -1,42 +1,83 @@
 import 'package:flutter/foundation.dart';
 
-class SinglePageInfo {
-  final int width, height;
-
-  SinglePageInfo({
-    this.width,
-    this.height,
-  });
-
-  factory SinglePageInfo.fromMap(Map map) {
-    return SinglePageInfo(
-      width: map['width'] as int,
-      height: map['height'] as int,
-    );
-  }
-
-  @override
-  String toString() => '$runtimeType#${shortHash(this)}{width=$width, height=$height}';
-}
-
 class MultiPageInfo {
-  final Map<int, SinglePageInfo> pages;
+  final List<SinglePageInfo> pages;
 
   int get pageCount => pages.length;
 
   MultiPageInfo({
     this.pages,
-  });
-
-  factory MultiPageInfo.fromMap(Map map) {
-    final pages = <int, SinglePageInfo>{};
-    map.keys.forEach((key) {
-      final index = key as int;
-      pages.putIfAbsent(index, () => SinglePageInfo.fromMap(map[key]));
-    });
-    return MultiPageInfo(pages: pages);
+  }) {
+    if (pages.isNotEmpty) {
+      pages.sort();
+      // make sure there is a page marked as default
+      if (defaultPage == null) {
+        final firstPage = pages.removeAt(0);
+        pages.insert(0, firstPage.copyWith(isDefault: true));
       }
+    }
+  }
+
+  factory MultiPageInfo.fromPageMaps(List<Map> pageMaps) {
+    return MultiPageInfo(pages: pageMaps.map((page) => SinglePageInfo.fromMap(page)).toList());
+  }
+
+  SinglePageInfo get defaultPage => pages.firstWhere((page) => page.isDefault, orElse: () => null);
+
+  SinglePageInfo getByIndex(int index) => pages.firstWhere((page) => page.index == index, orElse: () => null);
+
+  SinglePageInfo getById(int pageId) => pages.firstWhere((page) => page.pageId == pageId, orElse: () => null);
 
   @override
   String toString() => '$runtimeType#${shortHash(this)}{pages=$pages}';
 }
+
+class SinglePageInfo implements Comparable<SinglePageInfo> {
+  final int index, pageId;
+  final String mimeType;
+  final bool isDefault;
+  final int width, height, durationMillis;
+
+  const SinglePageInfo({
+    this.index,
+    this.pageId,
+    this.mimeType,
+    this.isDefault,
+    this.width,
+    this.height,
+    this.durationMillis,
+  });
+
+  SinglePageInfo copyWith({
+    bool isDefault,
+  }) {
+    return SinglePageInfo(
+      index: index,
+      pageId: pageId,
+      mimeType: mimeType,
+      isDefault: isDefault ?? this.isDefault,
+      width: width,
+      height: height,
+      durationMillis: durationMillis,
+    );
+  }
+
+  factory SinglePageInfo.fromMap(Map map) {
+    final index = map['page'] as int;
+    return SinglePageInfo(
+      index: index,
+      pageId: map['trackId'] as int ?? index,
+      mimeType: map['mimeType'] as String,
+      isDefault: map['isDefault'] as bool ?? false,
+      width: map['width'] as int ?? 0,
+      height: map['height'] as int ?? 0,
+      durationMillis: map['durationMillis'] as int,
+    );
+  }
+
+  @override
+  String toString() => '$runtimeType#${shortHash(this)}{index=$index, pageId=$pageId, mimeType=$mimeType, isDefault=$isDefault, width=$width, height=$height, durationMillis=$durationMillis}';
+
+  @override
+  int compareTo(SinglePageInfo other) => index.compareTo(other.index);
+}

lib/model/panorama.dart

@@ -4,24 +4,38 @@ import 'package:flutter/widgets.dart';
 class PanoramaInfo {
   final Rect croppedAreaRect;
   final Size fullPanoSize;
+  final String projectionType;
 
   PanoramaInfo({
     this.croppedAreaRect,
     this.fullPanoSize,
+    this.projectionType,
   });
 
   factory PanoramaInfo.fromMap(Map map) {
-    final cLeft = map['croppedAreaLeft'] as int;
-    final cTop = map['croppedAreaTop'] as int;
+    var cLeft = map['croppedAreaLeft'] as int;
+    var cTop = map['croppedAreaTop'] as int;
     final cWidth = map['croppedAreaWidth'] as int;
     final cHeight = map['croppedAreaHeight'] as int;
+    var fWidth = map['fullPanoWidth'] as int;
+    var fHeight = map['fullPanoHeight'] as int;
+    final projectionType = map['projectionType'] as String;
+
+    // handle missing `fullPanoHeight` (e.g. Samsung camera app panorama mode)
+    if (fHeight == null && cWidth != null && cHeight != null) {
+      // assume the cropped area is actually covering 360 degrees horizontally
+      // even when `croppedAreaLeft` is non zero
+      fWidth = cWidth;
+      fHeight = (fWidth / 2).round();
+      cTop = ((fHeight - cHeight) / 2).round();
+      cLeft = 0;
+    }
+
     Rect croppedAreaRect;
     if (cLeft != null && cTop != null && cWidth != null && cHeight != null) {
       croppedAreaRect = Rect.fromLTWH(cLeft.toDouble(), cTop.toDouble(), cWidth.toDouble(), cHeight.toDouble());
     }
 
-    final fWidth = map['fullPanoWidth'] as int;
-    final fHeight = map['fullPanoHeight'] as int;
     Size fullPanoSize;
     if (fWidth != null && fHeight != null) {
       fullPanoSize = Size(fWidth.toDouble(), fHeight.toDouble());
@@ -30,11 +44,12 @@ class PanoramaInfo {
     return PanoramaInfo(
       croppedAreaRect: croppedAreaRect,
       fullPanoSize: fullPanoSize,
+      projectionType: projectionType,
     );
   }
 
   bool get hasCroppedArea => croppedAreaRect != null && fullPanoSize != null;
 
   @override
-  String toString() => '$runtimeType#${shortHash(this)}{croppedAreaRect=$croppedAreaRect, fullPanoSize=$fullPanoSize}';
+  String toString() => '$runtimeType#${shortHash(this)}{croppedAreaRect=$croppedAreaRect, fullPanoSize=$fullPanoSize, projectionType=$projectionType}';
 }

lib/model/settings/map_style.dart

@@ -0,0 +1,34 @@
+// browse providers at https://leaflet-extras.github.io/leaflet-providers/preview/
+enum EntryMapStyle { googleNormal, googleHybrid, googleTerrain, osmHot, stamenToner, stamenWatercolor }
+
+extension ExtraEntryMapStyle on EntryMapStyle {
+  String get name {
+    switch (this) {
+      case EntryMapStyle.googleNormal:
+        return 'Google Maps';
+      case EntryMapStyle.googleHybrid:
+        return 'Google Maps (Hybrid)';
+      case EntryMapStyle.googleTerrain:
+        return 'Google Maps (Terrain)';
+      case EntryMapStyle.osmHot:
+        return 'Humanitarian OSM';
+      case EntryMapStyle.stamenToner:
+        return 'Stamen Toner';
+      case EntryMapStyle.stamenWatercolor:
+        return 'Stamen Watercolor';
+      default:
+        return toString();
+    }
+  }
+
+  bool get isGoogleMaps {
+    switch (this) {
+      case EntryMapStyle.googleNormal:
+      case EntryMapStyle.googleHybrid:
+      case EntryMapStyle.googleTerrain:
+        return true;
+      default:
+        return false;
+    }
+  }
+}

lib/model/settings/settings.dart

@@ -2,8 +2,8 @@ import 'package:aves/model/filters/filters.dart';
 import 'package:aves/model/settings/coordinate_format.dart';
 import 'package:aves/model/settings/entry_background.dart';
 import 'package:aves/model/settings/home_page.dart';
+import 'package:aves/model/settings/map_style.dart';
 import 'package:aves/model/settings/screen_on.dart';
-import 'package:aves/widgets/viewer/info/location_section.dart';
 import 'package:firebase_analytics/firebase_analytics.dart';
 import 'package:firebase_core/firebase_core.dart';
 import 'package:firebase_crashlytics/firebase_crashlytics.dart';

lib/model/source/album.dart

@@ -1,5 +1,5 @@
+import 'package:aves/model/entry.dart';
 import 'package:aves/model/filters/album.dart';
-import 'package:aves/model/image_entry.dart';
 import 'package:aves/model/settings/settings.dart';
 import 'package:aves/model/source/collection_source.dart';
 import 'package:aves/utils/android_file_utils.dart';
@@ -50,10 +50,10 @@ mixin AlbumMixin on SourceBase {
     }
   }
 
-  Map<String, ImageEntry> getAlbumEntries() {
+  Map<String, AvesEntry> getAlbumEntries() {
     final entries = sortedEntriesForFilterList;
     final regularAlbums = <String>[], appAlbums = <String>[], specialAlbums = <String>[];
-    for (var album in sortedAlbums) {
+    for (final album in sortedAlbums) {
       switch (androidFileUtils.getAlbumType(album)) {
         case AlbumType.regular:
           regularAlbums.add(album);

lib/model/source/collection_lens.dart

@@ -1,9 +1,9 @@
 import 'dart:async';
 import 'dart:collection';
 
+import 'package:aves/model/entry.dart';
 import 'package:aves/model/filters/album.dart';
 import 'package:aves/model/filters/filters.dart';
-import 'package:aves/model/image_entry.dart';
 import 'package:aves/model/source/collection_source.dart';
 import 'package:aves/model/source/section_keys.dart';
 import 'package:aves/model/source/tag.dart';
@@ -19,24 +19,28 @@ class CollectionLens with ChangeNotifier, CollectionActivityMixin, CollectionSel
   EntryGroupFactor groupFactor;
   EntrySortFactor sortFactor;
   final AChangeNotifier filterChangeNotifier = AChangeNotifier();
+  bool listenToSource;
 
-  List<ImageEntry> _filteredEntries;
+  List<AvesEntry> _filteredEntries;
   List<StreamSubscription> _subscriptions = [];
 
-  Map<SectionKey, List<ImageEntry>> sections = Map.unmodifiable({});
+  Map<SectionKey, List<AvesEntry>> sections = Map.unmodifiable({});
 
   CollectionLens({
     @required this.source,
     Iterable<CollectionFilter> filters,
     @required EntryGroupFactor groupFactor,
     @required EntrySortFactor sortFactor,
+    this.listenToSource = true,
   })  : filters = {if (filters != null) ...filters.where((f) => f != null)},
         groupFactor = groupFactor ?? EntryGroupFactor.month,
         sortFactor = sortFactor ?? EntrySortFactor.date {
+    if (listenToSource) {
       _subscriptions.add(source.eventBus.on<EntryAddedEvent>().listen((e) => _refresh()));
       _subscriptions.add(source.eventBus.on<EntryRemovedEvent>().listen((e) => onEntryRemoved(e.entries)));
       _subscriptions.add(source.eventBus.on<EntryMovedEvent>().listen((e) => _refresh()));
       _subscriptions.add(source.eventBus.on<CatalogMetadataChangedEvent>().listen((e) => _refresh()));
+    }
     _refresh();
   }
 
@@ -49,23 +53,14 @@ class CollectionLens with ChangeNotifier, CollectionActivityMixin, CollectionSel
     super.dispose();
   }
 
-  CollectionLens derive(CollectionFilter filter) {
-    return CollectionLens(
-      source: source,
-      filters: filters,
-      groupFactor: groupFactor,
-      sortFactor: sortFactor,
-    )..addFilter(filter);
-  }
-
   bool get isEmpty => _filteredEntries.isEmpty;
 
   int get entryCount => _filteredEntries.length;
 
   // sorted as displayed to the user, i.e. sorted then grouped, not an absolute order on all entries
-  List<ImageEntry> _sortedEntries;
+  List<AvesEntry> _sortedEntries;
 
-  List<ImageEntry> get sortedEntries {
+  List<AvesEntry> get sortedEntries {
     _sortedEntries ??= List.of(sections.entries.expand((e) => e.value));
     return _sortedEntries;
   }
@@ -82,7 +77,7 @@ class CollectionLens with ChangeNotifier, CollectionActivityMixin, CollectionSel
     return true;
   }
 
-  Object heroTag(ImageEntry entry) => '$hashCode${entry.uri}';
+  Object heroTag(AvesEntry entry) => entry.uri;
 
   void addFilter(CollectionFilter filter) {
     if (filter == null || filters.contains(filter)) return;
@@ -123,13 +118,13 @@ class CollectionLens with ChangeNotifier, CollectionActivityMixin, CollectionSel
   void _applySort() {
     switch (sortFactor) {
       case EntrySortFactor.date:
-        _filteredEntries.sort(ImageEntry.compareByDate);
+        _filteredEntries.sort(AvesEntry.compareByDate);
         break;
       case EntrySortFactor.size:
-        _filteredEntries.sort(ImageEntry.compareBySize);
+        _filteredEntries.sort(AvesEntry.compareBySize);
         break;
       case EntrySortFactor.name:
-        _filteredEntries.sort(ImageEntry.compareByName);
+        _filteredEntries.sort(AvesEntry.compareByName);
         break;
     }
   }
@@ -139,13 +134,13 @@ class CollectionLens with ChangeNotifier, CollectionActivityMixin, CollectionSel
       case EntrySortFactor.date:
         switch (groupFactor) {
           case EntryGroupFactor.album:
-            sections = groupBy<ImageEntry, EntryAlbumSectionKey>(_filteredEntries, (entry) => EntryAlbumSectionKey(entry.directory));
+            sections = groupBy<AvesEntry, EntryAlbumSectionKey>(_filteredEntries, (entry) => EntryAlbumSectionKey(entry.directory));
             break;
           case EntryGroupFactor.month:
-            sections = groupBy<ImageEntry, EntryDateSectionKey>(_filteredEntries, (entry) => EntryDateSectionKey(entry.monthTaken));
+            sections = groupBy<AvesEntry, EntryDateSectionKey>(_filteredEntries, (entry) => EntryDateSectionKey(entry.monthTaken));
             break;
           case EntryGroupFactor.day:
-            sections = groupBy<ImageEntry, EntryDateSectionKey>(_filteredEntries, (entry) => EntryDateSectionKey(entry.dayTaken));
+            sections = groupBy<AvesEntry, EntryDateSectionKey>(_filteredEntries, (entry) => EntryDateSectionKey(entry.dayTaken));
             break;
           case EntryGroupFactor.none:
             sections = Map.fromEntries([
@@ -160,8 +155,8 @@ class CollectionLens with ChangeNotifier, CollectionActivityMixin, CollectionSel
         ]);
         break;
       case EntrySortFactor.name:
-        final byAlbum = groupBy<ImageEntry, EntryAlbumSectionKey>(_filteredEntries, (entry) => EntryAlbumSectionKey(entry.directory));
-        sections = SplayTreeMap<EntryAlbumSectionKey, List<ImageEntry>>.of(byAlbum, (a, b) => source.compareAlbumsByName(a.folderPath, b.folderPath));
+        final byAlbum = groupBy<AvesEntry, EntryAlbumSectionKey>(_filteredEntries, (entry) => EntryAlbumSectionKey(entry.directory));
+        sections = SplayTreeMap<EntryAlbumSectionKey, List<AvesEntry>>.of(byAlbum, (a, b) => source.compareAlbumsByName(a.folderPath, b.folderPath));
         break;
     }
     sections = Map.unmodifiable(sections);
@@ -177,7 +172,7 @@ class CollectionLens with ChangeNotifier, CollectionActivityMixin, CollectionSel
     _applyGroup();
   }
 
-  void onEntryRemoved(Iterable<ImageEntry> entries) {
+  void onEntryRemoved(Iterable<AvesEntry> entries) {
     // we should remove obsolete entries and sections
     // but do not apply sort/group
     // as section order change would surprise the user while browsing
@@ -207,18 +202,18 @@ mixin CollectionActivityMixin {
 mixin CollectionSelectionMixin on CollectionActivityMixin {
   final AChangeNotifier selectionChangeNotifier = AChangeNotifier();
 
-  final Set<ImageEntry> _selection = {};
+  final Set<AvesEntry> _selection = {};
 
-  Set<ImageEntry> get selection => _selection;
+  Set<AvesEntry> get selection => _selection;
 
-  bool isSelected(Iterable<ImageEntry> entries) => entries.every(selection.contains);
+  bool isSelected(Iterable<AvesEntry> entries) => entries.every(selection.contains);
 
-  void addToSelection(Iterable<ImageEntry> entries) {
+  void addToSelection(Iterable<AvesEntry> entries) {
     _selection.addAll(entries);
     selectionChangeNotifier.notifyListeners();
   }
 
-  void removeFromSelection(Iterable<ImageEntry> entries) {
+  void removeFromSelection(Iterable<AvesEntry> entries) {
     _selection.removeAll(entries);
     selectionChangeNotifier.notifyListeners();
   }
@@ -228,7 +223,7 @@ mixin CollectionSelectionMixin on CollectionActivityMixin {
     selectionChangeNotifier.notifyListeners();
   }
 
-  void toggleSelection(ImageEntry entry) {
+  void toggleSelection(AvesEntry entry) {
     if (_selection.isEmpty) select();
     if (!_selection.remove(entry)) _selection.add(entry);
     selectionChangeNotifier.notifyListeners();

lib/model/source/collection_source.dart

@@ -1,30 +1,30 @@
 import 'dart:async';
 
+import 'package:aves/model/entry.dart';
 import 'package:aves/model/favourite_repo.dart';
 import 'package:aves/model/filters/filters.dart';
-import 'package:aves/model/image_entry.dart';
-import 'package:aves/model/image_metadata.dart';
+import 'package:aves/model/metadata.dart';
 import 'package:aves/model/metadata_db.dart';
 import 'package:aves/model/source/album.dart';
 import 'package:aves/model/source/collection_lens.dart';
 import 'package:aves/model/source/location.dart';
 import 'package:aves/model/source/tag.dart';
-import 'package:aves/services/image_file_service.dart';
+import 'package:aves/services/image_op_events.dart';
 import 'package:event_bus/event_bus.dart';
 import 'package:flutter/foundation.dart';
 
 import 'enums.dart';
 
 mixin SourceBase {
-  final List<ImageEntry> _rawEntries = [];
+  final List<AvesEntry> _rawEntries = [];
 
-  List<ImageEntry> get rawEntries => List.unmodifiable(_rawEntries);
+  List<AvesEntry> get rawEntries => List.unmodifiable(_rawEntries);
 
   final EventBus _eventBus = EventBus();
 
   EventBus get eventBus => _eventBus;
 
-  List<ImageEntry> get sortedEntriesForFilterList;
+  List<AvesEntry> get sortedEntriesForFilterList;
 
   final Map<CollectionFilter, int> _filterEntryCountMap = {};
 
@@ -39,7 +39,7 @@ mixin SourceBase {
 
 abstract class CollectionSource with SourceBase, AlbumMixin, LocationMixin, TagMixin {
   @override
-  List<ImageEntry> get sortedEntriesForFilterList => CollectionLens(
+  List<AvesEntry> get sortedEntriesForFilterList => CollectionLens(
         source: this,
         groupFactor: EntryGroupFactor.none,
         sortFactor: EntrySortFactor.date,
@@ -55,7 +55,8 @@ abstract class CollectionSource with SourceBase, AlbumMixin, LocationMixin, TagM
     debugPrint('$runtimeType loadDates complete in ${stopwatch.elapsed.inMilliseconds}ms for ${_savedDates.length} entries');
   }
 
-  void addAll(Iterable<ImageEntry> entries) {
+  void addAll(Iterable<AvesEntry> entries) {
+    if (entries.isEmpty) return;
     if (_rawEntries.isNotEmpty) {
       final newContentIds = entries.map((entry) => entry.contentId).toList();
       _rawEntries.removeWhere((entry) => newContentIds.contains(entry.contentId));
@@ -70,7 +71,7 @@ abstract class CollectionSource with SourceBase, AlbumMixin, LocationMixin, TagM
     eventBus.fire(EntryAddedEvent());
   }
 
-  void removeEntries(List<ImageEntry> entries) {
+  void removeEntries(List<AvesEntry> entries) {
     entries.forEach((entry) => entry.removeFromFavourites());
     _rawEntries.removeWhere(entries.contains);
     cleanEmptyAlbums(entries.map((entry) => entry.directory).toSet());
@@ -91,7 +92,7 @@ abstract class CollectionSource with SourceBase, AlbumMixin, LocationMixin, TagM
 
   // `dateModifiedSecs` changes when moving entries to another directory,
   // but it does not change when renaming the containing directory
-  Future<void> moveEntry(ImageEntry entry, Map newFields) async {
+  Future<void> moveEntry(AvesEntry entry, Map newFields) async {
     final oldContentId = entry.contentId;
     final newContentId = newFields['contentId'] as int;
     final newDateModifiedSecs = newFields['dateModifiedSecs'] as int;
@@ -109,7 +110,7 @@ abstract class CollectionSource with SourceBase, AlbumMixin, LocationMixin, TagM
   }
 
   void updateAfterMove({
-    @required Set<ImageEntry> selection,
+    @required Set<AvesEntry> selection,
     @required bool copy,
     @required String destinationAlbum,
     @required Iterable<MoveOpEvent> movedOps,
@@ -117,7 +118,7 @@ abstract class CollectionSource with SourceBase, AlbumMixin, LocationMixin, TagM
     if (movedOps.isEmpty) return;
 
     final fromAlbums = <String>{};
-    final movedEntries = <ImageEntry>[];
+    final movedEntries = <AvesEntry>[];
     if (copy) {
       movedOps.forEach((movedOp) {
         final sourceUri = movedOp.uri;
@@ -164,27 +165,31 @@ abstract class CollectionSource with SourceBase, AlbumMixin, LocationMixin, TagM
     return _filterEntryCountMap.putIfAbsent(filter, () => _rawEntries.where((entry) => filter.filter(entry)).length);
   }
 
+  bool get initialized => false;
+
+  Future<void> init();
+
   Future<void> refresh();
 
-  Future<void> refreshMetadata(Set<ImageEntry> entries);
+  Future<void> refreshMetadata(Set<AvesEntry> entries);
 }
 
 enum SourceState { loading, cataloguing, locating, ready }
 
 class EntryAddedEvent {
-  final ImageEntry entry;
+  final AvesEntry entry;
 
   const EntryAddedEvent([this.entry]);
 }
 
 class EntryRemovedEvent {
-  final Iterable<ImageEntry> entries;
+  final Iterable<AvesEntry> entries;
 
   const EntryRemovedEvent(this.entries);
 }
 
 class EntryMovedEvent {
-  final Iterable<ImageEntry> entries;
+  final Iterable<AvesEntry> entries;
 
   const EntryMovedEvent(this.entries);
 }

lib/model/source/location.dart

@@ -1,8 +1,9 @@
 import 'dart:math';
 
+import 'package:aves/model/connectivity.dart';
+import 'package:aves/model/entry.dart';
 import 'package:aves/model/filters/location.dart';
-import 'package:aves/model/image_entry.dart';
-import 'package:aves/model/image_metadata.dart';
+import 'package:aves/model/metadata.dart';
 import 'package:aves/model/metadata_db.dart';
 import 'package:aves/model/source/collection_source.dart';
 import 'package:collection/collection.dart';
@@ -27,8 +28,10 @@ mixin LocationMixin on SourceBase {
   }
 
   Future<void> locateEntries() async {
+    if (!(await connectivity.canGeolocate)) return;
+
 //    final stopwatch = Stopwatch()..start();
-    final byLocated = groupBy<ImageEntry, bool>(rawEntries.where((entry) => entry.hasGps), (entry) => entry.isLocated);
+    final byLocated = groupBy<AvesEntry, bool>(rawEntries.where((entry) => entry.hasGps), (entry) => entry.isLocated);
     final todo = byLocated[false] ?? [];
     if (todo.isEmpty) return;
 
@@ -42,7 +45,7 @@ mixin LocationMixin on SourceBase {
     // -  652 calls (22%) when approximating to 2 decimal places (~1km - town or village)
     // cf https://en.wikipedia.org/wiki/Decimal_degrees#Precision
     final latLngFactor = pow(10, 2);
-    Tuple2 approximateLatLng(ImageEntry entry) {
+    Tuple2 approximateLatLng(AvesEntry entry) {
       final lat = entry.catalogMetadata?.latitude;
       final lng = entry.catalogMetadata?.longitude;
       if (lat == null || lng == null) return null;
@@ -57,7 +60,7 @@ mixin LocationMixin on SourceBase {
     setProgress(done: progressDone, total: progressTotal);
 
     final newAddresses = <AddressDetails>[];
-    await Future.forEach<ImageEntry>(todo, (entry) async {
+    await Future.forEach<AvesEntry>(todo, (entry) async {
       final latLng = approximateLatLng(entry);
       if (knownLocations.containsKey(latLng)) {
         entry.addressDetails = knownLocations[latLng]?.copyWith(contentId: entry.contentId);

lib/model/source/media_store_source.dart

@@ -1,7 +1,8 @@
+import 'dart:async';
 import 'dart:math';
 
+import 'package:aves/model/entry.dart';
 import 'package:aves/model/favourite_repo.dart';
-import 'package:aves/model/image_entry.dart';
 import 'package:aves/model/metadata_db.dart';
 import 'package:aves/model/settings/settings.dart';
 import 'package:aves/model/source/collection_source.dart';
@@ -13,6 +14,12 @@ import 'package:flutter_native_timezone/flutter_native_timezone.dart';
 import 'package:pedantic/pedantic.dart';
 
 class MediaStoreSource extends CollectionSource {
+  bool _initialized = false;
+
+  @override
+  bool get initialized => _initialized;
+
+  @override
   Future<void> init() async {
     final stopwatch = Stopwatch()..start();
     stateNotifier.value = SourceState.loading;
@@ -28,11 +35,13 @@ class MediaStoreSource extends CollectionSource {
       settings.catalogTimeZone = currentTimeZone;
     }
     await loadDates(); // 100ms for 5400 entries
+    _initialized = true;
     debugPrint('$runtimeType init done, elapsed=${stopwatch.elapsed}');
   }
 
   @override
   Future<void> refresh() async {
+    assert(_initialized);
     debugPrint('$runtimeType refresh start');
     final stopwatch = Stopwatch()..start();
     stateNotifier.value = SourceState.loading;
@@ -40,8 +49,8 @@ class MediaStoreSource extends CollectionSource {
 
     final oldEntries = await metadataDb.loadEntries(); // 400ms for 5500 entries
     final knownEntryMap = Map.fromEntries(oldEntries.map((entry) => MapEntry(entry.contentId, entry.dateModifiedSecs)));
-    final obsoleteEntries = (await ImageFileService.getObsoleteEntries(knownEntryMap.keys.toList())).toSet();
-    oldEntries.removeWhere((entry) => obsoleteEntries.contains(entry.contentId));
+    final obsoleteContentIds = (await ImageFileService.getObsoleteEntries(knownEntryMap.keys.toList())).toSet();
+    oldEntries.removeWhere((entry) => obsoleteContentIds.contains(entry.contentId));
 
     // show known entries
     addAll(oldEntries);
@@ -50,19 +59,20 @@ class MediaStoreSource extends CollectionSource {
     debugPrint('$runtimeType refresh loaded ${oldEntries.length} known entries, elapsed=${stopwatch.elapsed}');
 
     // clean up obsolete entries
-    metadataDb.removeIds(obsoleteEntries, updateFavourites: true);
+    metadataDb.removeIds(obsoleteContentIds, updateFavourites: true);
 
     // fetch new entries
+    // refresh after the first 10 entries, then after 100 more, then every 1000 entries
     var refreshCount = 10;
     const refreshCountMax = 1000;
-    final allNewEntries = <ImageEntry>[], pendingNewEntries = <ImageEntry>[];
+    final allNewEntries = <AvesEntry>[], pendingNewEntries = <AvesEntry>[];
     void addPendingEntries() {
       allNewEntries.addAll(pendingNewEntries);
       addAll(pendingNewEntries);
       pendingNewEntries.clear();
     }
 
-    ImageFileService.getImageEntries(knownEntryMap).listen(
+    ImageFileService.getEntries(knownEntryMap).listen(
       (entry) {
         pendingNewEntries.add(entry);
         if (pendingNewEntries.length >= refreshCount) {
@@ -95,8 +105,48 @@ class MediaStoreSource extends CollectionSource {
     );
   }
 
+  Future<void> refreshUris(List<String> changedUris) async {
+    if (!_initialized) return;
+
+    final uriByContentId = Map.fromEntries(changedUris.map((uri) {
+      if (uri == null) return null;
+      final idString = Uri.parse(uri).pathSegments.last;
+      final contentId = int.tryParse(idString);
+      if (contentId == null) return null;
+      return MapEntry(contentId, uri);
+    }).where((kv) => kv != null));
+
+    // clean up obsolete entries
+    final obsoleteContentIds = (await ImageFileService.getObsoleteEntries(uriByContentId.keys.toList())).toSet();
+    uriByContentId.removeWhere((contentId, _) => obsoleteContentIds.contains(contentId));
+    metadataDb.removeIds(obsoleteContentIds, updateFavourites: true);
+
+    // add new entries
+    final newEntries = <AvesEntry>[];
+    for (final kv in uriByContentId.entries) {
+      final contentId = kv.key;
+      final uri = kv.value;
+      final sourceEntry = await ImageFileService.getEntry(uri, null);
+      final existingEntry = rawEntries.firstWhere((entry) => entry.contentId == contentId, orElse: () => null);
+      if (existingEntry == null || sourceEntry.dateModifiedSecs > existingEntry.dateModifiedSecs) {
+        newEntries.add(sourceEntry);
+      }
+    }
+    addAll(newEntries);
+    await metadataDb.saveEntries(newEntries);
+    updateAlbums();
+
+    stateNotifier.value = SourceState.cataloguing;
+    await catalogEntries();
+
+    stateNotifier.value = SourceState.locating;
+    await locateEntries();
+
+    stateNotifier.value = SourceState.ready;
+  }
+
   @override
-  Future<void> refreshMetadata(Set<ImageEntry> entries) {
+  Future<void> refreshMetadata(Set<AvesEntry> entries) {
     final contentIds = entries.map((entry) => entry.contentId).toSet();
     metadataDb.removeIds(contentIds, updateFavourites: false);
     return refresh();

lib/model/source/tag.dart

@@ -1,5 +1,5 @@
-import 'package:aves/model/image_entry.dart';
-import 'package:aves/model/image_metadata.dart';
+import 'package:aves/model/entry.dart';
+import 'package:aves/model/metadata.dart';
 import 'package:aves/model/metadata_db.dart';
 import 'package:aves/model/source/collection_source.dart';
 import 'package:collection/collection.dart';
@@ -31,7 +31,7 @@ mixin TagMixin on SourceBase {
     setProgress(done: progressDone, total: progressTotal);
 
     final newMetadata = <CatalogMetadata>[];
-    await Future.forEach<ImageEntry>(todo, (entry) async {
+    await Future.forEach<AvesEntry>(todo, (entry) async {
       await entry.catalog(background: true);
       if (entry.isCatalogued) {
         newMetadata.add(entry.catalogMetadata);

lib/services/android_app_service.dart

@@ -1,6 +1,7 @@
 import 'dart:typed_data';
 
-import 'package:aves/model/image_entry.dart';
+import 'package:aves/model/entry.dart';
+import 'package:aves/utils/android_file_utils.dart';
 import 'package:collection/collection.dart';
 import 'package:flutter/foundation.dart';
 import 'package:flutter/services.dart';
@@ -8,12 +9,18 @@ import 'package:flutter/services.dart';
 class AndroidAppService {
   static const platform = MethodChannel('deckers.thibault/aves/app');
 
-  static Future<Map> getAppNames() async {
+  static Future<Set<Package>> getPackages() async {
     try {
-      final result = await platform.invokeMethod('getAppNames');
-      return result as Map;
+      final result = await platform.invokeMethod('getPackages');
+      final packages = (result as List).cast<Map>().map((map) => Package.fromMap(map)).toSet();
+      // additional info for known directories
+      final kakaoTalk = packages.firstWhere((package) => package.packageName == 'com.kakao.talk', orElse: () => null);
+      if (kakaoTalk != null) {
+        kakaoTalk.ownedDirs.add('KakaoTalkDownload');
+      }
+      return packages;
     } on PlatformException catch (e) {
-      debugPrint('getAppNames failed with code=${e.code}, exception=${e.message}, details=${e.details}}');
+      debugPrint('getPackages failed with code=${e.code}, exception=${e.message}, details=${e.details}}');
     }
     return {};
   }
@@ -81,10 +88,10 @@ class AndroidAppService {
     return false;
   }
 
-  static Future<bool> shareEntries(Iterable<ImageEntry> entries) async {
+  static Future<bool> shareEntries(Iterable<AvesEntry> entries) async {
     // loosen mime type to a generic one, so we can share with badly defined apps
     // e.g. Google Lens declares receiving "image/jpeg" only, but it can actually handle more formats
-    final urisByMimeType = groupBy<ImageEntry, String>(entries, (e) => e.mimeTypeAnySubtype).map((k, v) => MapEntry(k, v.map((e) => e.uri).toList()));
+    final urisByMimeType = groupBy<AvesEntry, String>(entries, (e) => e.mimeTypeAnySubtype).map((k, v) => MapEntry(k, v.map((e) => e.uri).toList()));
     try {
       return await platform.invokeMethod('share', <String, dynamic>{
         'title': 'Share via:',

lib/services/android_debug_service.dart

@@ -1,4 +1,4 @@
-import 'package:aves/model/image_entry.dart';
+import 'package:aves/model/entry.dart';
 import 'package:aves/ref/mime_types.dart';
 import 'package:flutter/foundation.dart';
 import 'package:flutter/services.dart';
@@ -26,7 +26,7 @@ class AndroidDebugService {
     return {};
   }
 
-  static Future<Map> getBitmapFactoryInfo(ImageEntry entry) async {
+  static Future<Map> getBitmapFactoryInfo(AvesEntry entry) async {
     try {
       // return map with all data available when decoding image bounds with `BitmapFactory`
       final result = await platform.invokeMethod('getBitmapFactoryInfo', <String, dynamic>{
@@ -39,7 +39,7 @@ class AndroidDebugService {
     return {};
   }
 
-  static Future<Map> getContentResolverMetadata(ImageEntry entry) async {
+  static Future<Map> getContentResolverMetadata(AvesEntry entry) async {
     try {
       // return map with all data available from the content resolver
       final result = await platform.invokeMethod('getContentResolverMetadata', <String, dynamic>{
@@ -53,7 +53,7 @@ class AndroidDebugService {
     return {};
   }
 
-  static Future<Map> getExifInterfaceMetadata(ImageEntry entry) async {
+  static Future<Map> getExifInterfaceMetadata(AvesEntry entry) async {
     try {
       // return map with all data available from the `ExifInterface` library
       final result = await platform.invokeMethod('getExifInterfaceMetadata', <String, dynamic>{
@@ -68,7 +68,7 @@ class AndroidDebugService {
     return {};
   }
 
-  static Future<Map> getMediaMetadataRetrieverMetadata(ImageEntry entry) async {
+  static Future<Map> getMediaMetadataRetrieverMetadata(AvesEntry entry) async {
     try {
       // return map with all data available from `MediaMetadataRetriever`
       final result = await platform.invokeMethod('getMediaMetadataRetrieverMetadata', <String, dynamic>{
@@ -81,7 +81,7 @@ class AndroidDebugService {
     return {};
   }
 
-  static Future<Map> getMetadataExtractorSummary(ImageEntry entry) async {
+  static Future<Map> getMetadataExtractorSummary(AvesEntry entry) async {
     try {
       // return map with the mime type and tag count for each directory found by `metadata-extractor`
       final result = await platform.invokeMethod('getMetadataExtractorSummary', <String, dynamic>{
@@ -96,7 +96,7 @@ class AndroidDebugService {
     return {};
   }
 
-  static Future<Map> getTiffStructure(ImageEntry entry) async {
+  static Future<Map> getTiffStructure(AvesEntry entry) async {
     if (entry.mimeType != MimeTypes.tiff) return {};
 
     try {

lib/services/android_file_service.dart

@@ -9,14 +9,14 @@ class AndroidFileService {
   static const platform = MethodChannel('deckers.thibault/aves/storage');
   static final StreamsChannel storageAccessChannel = StreamsChannel('deckers.thibault/aves/storageaccessstream');
 
-  static Future<List<Map>> getStorageVolumes() async {
+  static Future<Set<StorageVolume>> getStorageVolumes() async {
     try {
       final result = await platform.invokeMethod('getStorageVolumes');
-      return (result as List).cast<Map>();
+      return (result as List).cast<Map>().map((map) => StorageVolume.fromMap(map)).toSet();
     } on PlatformException catch (e) {
       debugPrint('getStorageVolumes failed with code=${e.code}, exception=${e.message}, details=${e.details}}');
     }
-    return [];
+    return {};
   }
 
   static Future<int> getFreeSpace(StorageVolume volume) async {

lib/services/app_shortcut_service.dart

@@ -1,7 +1,7 @@
 import 'dart:typed_data';
 
+import 'package:aves/model/entry.dart';
 import 'package:aves/model/filters/filters.dart';
-import 'package:aves/model/image_entry.dart';
 import 'package:aves/services/image_file_service.dart';
 import 'package:flutter/foundation.dart';
 import 'package:flutter/services.dart';
@@ -26,18 +26,18 @@ class AppShortcutService {
     return false;
   }
 
-  static Future<void> pin(String label, ImageEntry iconEntry, Set<CollectionFilter> filters) async {
+  static Future<void> pin(String label, AvesEntry entry, Set<CollectionFilter> filters) async {
     Uint8List iconBytes;
-    if (iconEntry != null) {
-      final size = iconEntry.isVideo ? 0.0 : 256.0;
+    if (entry != null) {
+      final size = entry.isVideo ? 0.0 : 256.0;
       iconBytes = await ImageFileService.getThumbnail(
-        iconEntry.uri,
-        iconEntry.mimeType,
-        iconEntry.dateModifiedSecs,
-        iconEntry.rotationDegrees,
-        iconEntry.isFlipped,
-        size,
-        size,
+        uri: entry.uri,
+        mimeType: entry.mimeType,
+        pageId: entry.pageId,
+        rotationDegrees: entry.rotationDegrees,
+        isFlipped: entry.isFlipped,
+        dateModifiedSecs: entry.dateModifiedSecs,
+        extent: size,
       );
     }
     try {

lib/services/image_file_service.dart

@@ -3,12 +3,12 @@ import 'dart:convert';
 import 'dart:math';
 import 'dart:typed_data';
 
-import 'package:aves/model/image_entry.dart';
+import 'package:aves/model/entry.dart';
 import 'package:aves/ref/mime_types.dart';
+import 'package:aves/services/image_op_events.dart';
 import 'package:aves/services/service_policy.dart';
-import 'package:flutter/foundation.dart';
-import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
+import 'package:flutter/widgets.dart';
 import 'package:streams_channel/streams_channel.dart';
 
 class ImageFileService {
@@ -18,10 +18,11 @@ class ImageFileService {
   static final StreamsChannel opChannel = StreamsChannel('deckers.thibault/aves/imageopstream');
   static const double thumbnailDefaultSize = 64.0;
 
-  static Map<String, dynamic> _toPlatformEntryMap(ImageEntry entry) {
+  static Map<String, dynamic> _toPlatformEntryMap(AvesEntry entry) {
     return {
       'uri': entry.uri,
       'path': entry.path,
+      'pageId': entry.pageId,
       'mimeType': entry.mimeType,
       'width': entry.width,
       'height': entry.height,
@@ -32,13 +33,13 @@ class ImageFileService {
   }
 
   // knownEntries: map of contentId -> dateModifiedSecs
-  static Stream<ImageEntry> getImageEntries(Map<int, int> knownEntries) {
+  static Stream<AvesEntry> getEntries(Map<int, int> knownEntries) {
     try {
       return mediaStoreChannel.receiveBroadcastStream(<String, dynamic>{
         'knownEntries': knownEntries,
-      }).map((event) => ImageEntry.fromMap(event));
+      }).map((event) => AvesEntry.fromMap(event));
     } on PlatformException catch (e) {
-      debugPrint('getImageEntries failed with code=${e.code}, exception=${e.message}, details=${e.details}');
+      debugPrint('getEntries failed with code=${e.code}, exception=${e.message}, details=${e.details}');
       return Stream.error(e);
     }
   }
@@ -55,26 +56,40 @@ class ImageFileService {
     return [];
   }
 
-  static Future<ImageEntry> getImageEntry(String uri, String mimeType) async {
-    debugPrint('getImageEntry for uri=$uri, mimeType=$mimeType');
+  static Future<AvesEntry> getEntry(String uri, String mimeType) async {
     try {
-      final result = await platform.invokeMethod('getImageEntry', <String, dynamic>{
+      final result = await platform.invokeMethod('getEntry', <String, dynamic>{
         'uri': uri,
         'mimeType': mimeType,
       }) as Map;
-      return ImageEntry.fromMap(result);
+      return AvesEntry.fromMap(result);
     } on PlatformException catch (e) {
-      debugPrint('getImageEntry failed with code=${e.code}, exception=${e.message}, details=${e.details}');
+      debugPrint('getEntry failed with code=${e.code}, exception=${e.message}, details=${e.details}');
     }
     return null;
   }
 
+  static Future<Uint8List> getSvg(
+    String uri,
+    String mimeType, {
+    int expectedContentLength,
+    BytesReceivedCallback onBytesReceived,
+  }) =>
+      getImage(
+        uri,
+        mimeType,
+        0,
+        false,
+        expectedContentLength: expectedContentLength,
+        onBytesReceived: onBytesReceived,
+      );
+
   static Future<Uint8List> getImage(
     String uri,
     String mimeType,
     int rotationDegrees,
     bool isFlipped, {
-    int page = 0,
+    int pageId,
     int expectedContentLength,
     BytesReceivedCallback onBytesReceived,
   }) {
@@ -87,7 +102,7 @@ class ImageFileService {
         'mimeType': mimeType,
         'rotationDegrees': rotationDegrees ?? 0,
         'isFlipped': isFlipped ?? false,
-        'page': page ?? 0,
+        'pageId': pageId,
       }).listen(
         (data) {
           final chunk = data as Uint8List;
@@ -125,7 +140,7 @@ class ImageFileService {
     int sampleSize,
     Rectangle<int> regionRect,
     Size imageSize, {
-    int page = 0,
+    int pageId,
     Object taskKey,
     int priority,
   }) {
@@ -135,7 +150,7 @@ class ImageFileService {
           final result = await platform.invokeMethod('getRegion', <String, dynamic>{
             'uri': uri,
             'mimeType': mimeType,
-            'page': page,
+            'pageId': pageId,
             'sampleSize': sampleSize,
             'regionX': regionRect.left,
             'regionY': regionRect.top,
@@ -155,15 +170,14 @@ class ImageFileService {
     );
   }
 
-  static Future<Uint8List> getThumbnail(
-    String uri,
-    String mimeType,
-    int dateModifiedSecs,
-    int rotationDegrees,
-    bool isFlipped,
-    double width,
-    double height, {
-    int page,
+  static Future<Uint8List> getThumbnail({
+    @required String uri,
+    @required String mimeType,
+    @required int rotationDegrees,
+    @required int pageId,
+    @required bool isFlipped,
+    @required int dateModifiedSecs,
+    @required double extent,
     Object taskKey,
     int priority,
   }) {
@@ -179,9 +193,9 @@ class ImageFileService {
             'dateModifiedSecs': dateModifiedSecs,
             'rotationDegrees': rotationDegrees,
             'isFlipped': isFlipped,
-            'widthDip': width,
-            'heightDip': height,
-            'page': page,
+            'widthDip': extent,
+            'heightDip': extent,
+            'pageId': pageId,
             'defaultSizeDip': thumbnailDefaultSize,
           });
           return result as Uint8List;
@@ -191,7 +205,7 @@ class ImageFileService {
         return null;
       },
 //      debugLabel: 'getThumbnail width=$width, height=$height entry=${entry.filenameWithoutExtension}',
-      priority: priority ?? (width == 0 || height == 0 ? ServiceCallPriority.getFastThumbnail : ServiceCallPriority.getSizedThumbnail),
+      priority: priority ?? (extent == 0 ? ServiceCallPriority.getFastThumbnail : ServiceCallPriority.getSizedThumbnail),
       key: taskKey,
     );
   }
@@ -210,7 +224,7 @@ class ImageFileService {
 
   static Future<T> resumeLoading<T>(Object taskKey) => servicePolicy.resume<T>(taskKey);
 
-  static Stream<ImageOpEvent> delete(Iterable<ImageEntry> entries) {
+  static Stream<ImageOpEvent> delete(Iterable<AvesEntry> entries) {
     try {
       return opChannel.receiveBroadcastStream(<String, dynamic>{
         'op': 'delete',
@@ -222,7 +236,11 @@ class ImageFileService {
     }
   }
 
-  static Stream<MoveOpEvent> move(Iterable<ImageEntry> entries, {@required bool copy, @required String destinationAlbum}) {
+  static Stream<MoveOpEvent> move(
+    Iterable<AvesEntry> entries, {
+    @required bool copy,
+    @required String destinationAlbum,
+  }) {
     try {
       return opChannel.receiveBroadcastStream(<String, dynamic>{
         'op': 'move',
@@ -236,7 +254,25 @@ class ImageFileService {
     }
   }
 
-  static Future<Map> rename(ImageEntry entry, String newName) async {
+  static Stream<ExportOpEvent> export(
+    Iterable<AvesEntry> entries, {
+    String mimeType = MimeTypes.jpeg,
+    @required String destinationAlbum,
+  }) {
+    try {
+      return opChannel.receiveBroadcastStream(<String, dynamic>{
+        'op': 'export',
+        'entries': entries.map(_toPlatformEntryMap).toList(),
+        'mimeType': mimeType,
+        'destinationPath': destinationAlbum,
+      }).map((event) => ExportOpEvent.fromMap(event));
+    } on PlatformException catch (e) {
+      debugPrint('export failed with code=${e.code}, exception=${e.message}, details=${e.details}');
+      return Stream.error(e);
+    }
+  }
+
+  static Future<Map> rename(AvesEntry entry, String newName) async {
     try {
       // return map with: 'contentId' 'path' 'title' 'uri' (all optional)
       final result = await platform.invokeMethod('rename', <String, dynamic>{
@@ -250,7 +286,7 @@ class ImageFileService {
     return {};
   }
 
-  static Future<Map> rotate(ImageEntry entry, {@required bool clockwise}) async {
+  static Future<Map> rotate(AvesEntry entry, {@required bool clockwise}) async {
     try {
       // return map with: 'rotationDegrees' 'isFlipped'
       final result = await platform.invokeMethod('rotate', <String, dynamic>{
@@ -264,7 +300,7 @@ class ImageFileService {
     return {};
   }
 
-  static Future<Map> flip(ImageEntry entry) async {
+  static Future<Map> flip(AvesEntry entry) async {
     try {
       // return map with: 'rotationDegrees' 'isFlipped'
       final result = await platform.invokeMethod('flip', <String, dynamic>{
@@ -278,57 +314,6 @@ class ImageFileService {
   }
 }
 
-@immutable
-class ImageOpEvent {
-  final bool success;
-  final String uri;
-
-  const ImageOpEvent({
-    this.success,
-    this.uri,
-  });
-
-  factory ImageOpEvent.fromMap(Map map) {
-    return ImageOpEvent(
-      success: map['success'] ?? false,
-      uri: map['uri'],
-    );
-  }
-
-  @override
-  bool operator ==(Object other) {
-    if (other.runtimeType != runtimeType) return false;
-    return other is ImageOpEvent && other.success == success && other.uri == uri;
-  }
-
-  @override
-  int get hashCode => hashValues(success, uri);
-
-  @override
-  String toString() => '$runtimeType#${shortHash(this)}{success=$success, uri=$uri}';
-}
-
-class MoveOpEvent extends ImageOpEvent {
-  final Map newFields;
-
-  const MoveOpEvent({bool success, String uri, this.newFields})
-      : super(
-          success: success,
-          uri: uri,
-        );
-
-  factory MoveOpEvent.fromMap(Map map) {
-    return MoveOpEvent(
-      success: map['success'] ?? false,
-      uri: map['uri'],
-      newFields: map['newFields'],
-    );
-  }
-
-  @override
-  String toString() => '$runtimeType#${shortHash(this)}{success=$success, uri=$uri, newFields=$newFields}';
-}
-
 // cf flutter/foundation `consolidateHttpClientResponseBytes`
 typedef BytesReceivedCallback = void Function(int cumulative, int total);
 

lib/services/image_op_events.dart

@@ -0,0 +1,85 @@
+import 'package:flutter/foundation.dart';
+import 'package:flutter/widgets.dart';
+
+@immutable
+class ImageOpEvent {
+  final bool success;
+  final String uri;
+
+  const ImageOpEvent({
+    this.success,
+    this.uri,
+  });
+
+  factory ImageOpEvent.fromMap(Map map) {
+    return ImageOpEvent(
+      success: map['success'] ?? false,
+      uri: map['uri'],
+    );
+  }
+
+  @override
+  bool operator ==(Object other) {
+    if (other.runtimeType != runtimeType) return false;
+    return other is ImageOpEvent && other.success == success && other.uri == uri;
+  }
+
+  @override
+  int get hashCode => hashValues(success, uri);
+
+  @override
+  String toString() => '$runtimeType#${shortHash(this)}{success=$success, uri=$uri}';
+}
+
+class MoveOpEvent extends ImageOpEvent {
+  final Map newFields;
+
+  const MoveOpEvent({bool success, String uri, this.newFields})
+      : super(
+          success: success,
+          uri: uri,
+        );
+
+  factory MoveOpEvent.fromMap(Map map) {
+    return MoveOpEvent(
+      success: map['success'] ?? false,
+      uri: map['uri'],
+      newFields: map['newFields'],
+    );
+  }
+
+  @override
+  String toString() => '$runtimeType#${shortHash(this)}{success=$success, uri=$uri, newFields=$newFields}';
+}
+
+class ExportOpEvent extends MoveOpEvent {
+  final int pageId;
+
+  const ExportOpEvent({bool success, String uri, this.pageId, Map newFields})
+      : super(
+          success: success,
+          uri: uri,
+          newFields: newFields,
+        );
+
+  factory ExportOpEvent.fromMap(Map map) {
+    return ExportOpEvent(
+      success: map['success'] ?? false,
+      uri: map['uri'],
+      pageId: map['pageId'],
+      newFields: map['newFields'],
+    );
+  }
+
+  @override
+  bool operator ==(Object other) {
+    if (other.runtimeType != runtimeType) return false;
+    return other is ExportOpEvent && other.success == success && other.uri == uri && other.pageId == pageId;
+  }
+
+  @override
+  int get hashCode => hashValues(success, uri, pageId);
+
+  @override
+  String toString() => '$runtimeType#${shortHash(this)}{success=$success, uri=$uri, pageId=$pageId, newFields=$newFields}';
+}

lib/services/metadata_service.dart

@@ -1,7 +1,7 @@
 import 'dart:typed_data';
 
-import 'package:aves/model/image_entry.dart';
-import 'package:aves/model/image_metadata.dart';
+import 'package:aves/model/entry.dart';
+import 'package:aves/model/metadata.dart';
 import 'package:aves/model/multipage.dart';
 import 'package:aves/model/panorama.dart';
 import 'package:aves/services/service_policy.dart';
@@ -12,7 +12,7 @@ class MetadataService {
   static const platform = MethodChannel('deckers.thibault/aves/metadata');
 
   // return Map<Map<Key, Value>> (map of directories, each directory being a map of metadata label and value description)
-  static Future<Map> getAllMetadata(ImageEntry entry) async {
+  static Future<Map> getAllMetadata(AvesEntry entry) async {
     if (entry.isSvg) return null;
 
     try {
@@ -28,7 +28,7 @@ class MetadataService {
     return {};
   }
 
-  static Future<CatalogMetadata> getCatalogMetadata(ImageEntry entry, {bool background = false}) async {
+  static Future<CatalogMetadata> getCatalogMetadata(AvesEntry entry, {bool background = false}) async {
     if (entry.isSvg) return null;
 
     Future<CatalogMetadata> call() async {
@@ -65,7 +65,7 @@ class MetadataService {
         : call();
   }
 
-  static Future<OverlayMetadata> getOverlayMetadata(ImageEntry entry) async {
+  static Future<OverlayMetadata> getOverlayMetadata(AvesEntry entry) async {
     if (entry.isSvg) return null;
 
     try {
@@ -82,20 +82,21 @@ class MetadataService {
     return null;
   }
 
-  static Future<MultiPageInfo> getMultiPageInfo(ImageEntry entry) async {
+  static Future<MultiPageInfo> getMultiPageInfo(AvesEntry entry) async {
     try {
       final result = await platform.invokeMethod('getMultiPageInfo', <String, dynamic>{
         'mimeType': entry.mimeType,
         'uri': entry.uri,
-      }) as Map;
-      return MultiPageInfo.fromMap(result);
+      });
+      final pageMaps = (result as List).cast<Map>();
+      return MultiPageInfo.fromPageMaps(pageMaps);
     } on PlatformException catch (e) {
       debugPrint('getMultiPageInfo failed with code=${e.code}, exception=${e.message}, details=${e.details}');
     }
     return null;
   }
 
-  static Future<PanoramaInfo> getPanoramaInfo(ImageEntry entry) async {
+  static Future<PanoramaInfo> getPanoramaInfo(AvesEntry entry) async {
     try {
       // return map with values for:
       // 'croppedAreaLeft' (int), 'croppedAreaTop' (int), 'croppedAreaWidth' (int), 'croppedAreaHeight' (int),
@@ -112,6 +113,19 @@ class MetadataService {
     return null;
   }
 
+  static Future<String> getContentResolverProp(AvesEntry entry, String prop) async {
+    try {
+      return await platform.invokeMethod('getContentResolverProp', <String, dynamic>{
+        'mimeType': entry.mimeType,
+        'uri': entry.uri,
+        'prop': prop,
+      });
+    } on PlatformException catch (e) {
+      debugPrint('getContentResolverProp failed with code=${e.code}, exception=${e.message}, details=${e.details}');
+    }
+    return null;
+  }
+
   static Future<List<Uint8List>> getEmbeddedPictures(String uri) async {
     try {
       final result = await platform.invokeMethod('getEmbeddedPictures', <String, dynamic>{
@@ -124,7 +138,7 @@ class MetadataService {
     return [];
   }
 
-  static Future<List<Uint8List>> getExifThumbnails(ImageEntry entry) async {
+  static Future<List<Uint8List>> getExifThumbnails(AvesEntry entry) async {
     try {
       final result = await platform.invokeMethod('getExifThumbnails', <String, dynamic>{
         'mimeType': entry.mimeType,
@@ -138,7 +152,7 @@ class MetadataService {
     return [];
   }
 
-  static Future<Map> extractXmpDataProp(ImageEntry entry, String propPath, String propMimeType) async {
+  static Future<Map> extractXmpDataProp(AvesEntry entry, String propPath, String propMimeType) async {
     try {
       final result = await platform.invokeMethod('extractXmpDataProp', <String, dynamic>{
         'mimeType': entry.mimeType,

lib/services/svg_metadata_service.dart

@@ -1,6 +1,6 @@
 import 'dart:convert';
 
-import 'package:aves/model/image_entry.dart';
+import 'package:aves/model/entry.dart';
 import 'package:aves/services/image_file_service.dart';
 import 'package:aves/utils/string_utils.dart';
 import 'package:flutter/foundation.dart';
@@ -15,9 +15,9 @@ class SvgMetadataService {
   static const _textElements = ['title', 'desc'];
   static const _metadataElement = 'metadata';
 
-  static Future<Size> getSize(ImageEntry entry) async {
+  static Future<Size> getSize(AvesEntry entry) async {
     try {
-      final data = await ImageFileService.getImage(entry.uri, entry.mimeType, 0, false);
+      final data = await ImageFileService.getSvg(entry.uri, entry.mimeType);
 
       final document = XmlDocument.parse(utf8.decode(data));
       final root = document.rootElement;
@@ -48,7 +48,7 @@ class SvgMetadataService {
     return null;
   }
 
-  static Future<Map<String, Map<String, String>>> getAllMetadata(ImageEntry entry) async {
+  static Future<Map<String, Map<String, String>>> getAllMetadata(AvesEntry entry) async {
     String formatKey(String key) {
       switch (key) {
         case 'desc':
@@ -59,7 +59,7 @@ class SvgMetadataService {
     }
 
     try {
-      final data = await ImageFileService.getImage(entry.uri, entry.mimeType, 0, false);
+      final data = await ImageFileService.getSvg(entry.uri, entry.mimeType);
 
       final document = XmlDocument.parse(utf8.decode(data));
       final root = document.rootElement;

lib/theme/durations.dart

@@ -48,4 +48,11 @@ class Durations {
   static const doubleBackTimerDelay = Duration(milliseconds: 1000);
   static const softKeyboardDisplayDelay = Duration(milliseconds: 300);
   static const searchDebounceDelay = Duration(milliseconds: 250);
+
+  // Content change monitoring delay should be large enough,
+  // so that querying the Media Store yields final entries.
+  // For example, when taking a picture with a Galaxy S10e default camera app,
+  // querying the Media Store just 1 second after sometimes yields an entry with
+  // its temporary path: `/data/sec/camera/!@#$%^..._temp.jpg`
+  static const contentChangeDebounceDelay = Duration(milliseconds: 1500);
 }

lib/theme/icons.dart

@@ -31,6 +31,7 @@ class AIcons {
   static const IconData createAlbum = Icons.add_circle_outline;
   static const IconData debug = Icons.whatshot_outlined;
   static const IconData delete = Icons.delete_outlined;
+  static const IconData export = Icons.save_alt_outlined;
   static const IconData flip = Icons.flip_outlined;
   static const IconData favourite = Icons.favorite_border;
   static const IconData favouriteActive = Icons.favorite;
@@ -38,7 +39,7 @@ class AIcons {
   static const IconData group = Icons.group_work_outlined;
   static const IconData info = Icons.info_outlined;
   static const IconData layers = Icons.layers_outlined;
-  static const IconData openInNew = Icons.open_in_new_outlined;
+  static const IconData openOutside = Icons.open_in_new_outlined;
   static const IconData pin = Icons.push_pin_outlined;
   static const IconData print = Icons.print_outlined;
   static const IconData refresh = Icons.refresh_outlined;

lib/utils/android_file_utils.dart

@@ -1,6 +1,7 @@
 import 'package:aves/services/android_app_service.dart';
 import 'package:aves/services/android_file_service.dart';
 import 'package:aves/utils/change_notifier.dart';
+import 'package:flutter/foundation.dart';
 import 'package:path/path.dart';
 
 final AndroidFileUtils androidFileUtils = AndroidFileUtils._private();
@@ -8,14 +9,17 @@ final AndroidFileUtils androidFileUtils = AndroidFileUtils._private();
 class AndroidFileUtils {
   String primaryStorage, dcimPath, downloadPath, moviesPath, picturesPath;
   Set<StorageVolume> storageVolumes = {};
-  Map appNameMap = {};
+  Set<Package> _packages = {};
+  List<String> _potentialAppDirs = [];
 
   AChangeNotifier appNameChangeNotifier = AChangeNotifier();
 
+  Iterable<Package> get _launcherPackages => _packages.where((package) => package.categoryLauncher);
+
   AndroidFileUtils._private();
 
   Future<void> init() async {
-    storageVolumes = (await AndroidFileService.getStorageVolumes()).map((map) => StorageVolume.fromMap(map)).toSet();
+    storageVolumes = await AndroidFileService.getStorageVolumes();
     // path_provider getExternalStorageDirectory() gives '/storage/emulated/0/Android/data/deckers.thibault.aves/files'
     primaryStorage = storageVolumes.firstWhere((volume) => volume.isPrimary).path;
     dcimPath = join(primaryStorage, 'DCIM');
@@ -25,8 +29,8 @@ class AndroidFileUtils {
   }
 
   Future<void> initAppNames() async {
-    appNameMap = await AndroidAppService.getAppNames()
-      ..addAll({'KakaoTalkDownload': 'com.kakao.talk'});
+    _packages = await AndroidAppService.getPackages();
+    _potentialAppDirs = _launcherPackages.expand((package) => package.potentialDirs).toList();
     appNameChangeNotifier.notifyListeners();
   }
 
@@ -42,27 +46,67 @@ class AndroidFileUtils {
 
   bool isOnRemovableStorage(String path) => getStorageVolume(path)?.isRemovable ?? false;
 
-  AlbumType getAlbumType(String albumDirectory) {
-    if (albumDirectory != null) {
-      if (isCameraPath(albumDirectory)) return AlbumType.camera;
-      if (isDownloadPath(albumDirectory)) return AlbumType.download;
-      if (isScreenRecordingsPath(albumDirectory)) return AlbumType.screenRecordings;
-      if (isScreenshotsPath(albumDirectory)) return AlbumType.screenshots;
+  AlbumType getAlbumType(String albumPath) {
+    if (albumPath != null) {
+      if (isCameraPath(albumPath)) return AlbumType.camera;
+      if (isDownloadPath(albumPath)) return AlbumType.download;
+      if (isScreenRecordingsPath(albumPath)) return AlbumType.screenRecordings;
+      if (isScreenshotsPath(albumPath)) return AlbumType.screenshots;
 
-      final parts = albumDirectory.split(separator);
-      if (albumDirectory.startsWith(primaryStorage) && appNameMap.keys.contains(parts.last)) return AlbumType.app;
+      final dir = albumPath.split(separator).last;
+      if (albumPath.startsWith(primaryStorage) && _potentialAppDirs.contains(dir)) return AlbumType.app;
     }
     return AlbumType.regular;
   }
 
-  String getAlbumAppPackageName(String albumDirectory) {
-    final parts = albumDirectory.split(separator);
-    return appNameMap[parts.last];
+  String getAlbumAppPackageName(String albumPath) {
+    if (albumPath == null) return null;
+    final dir = albumPath.split(separator).last;
+    final package = _launcherPackages.firstWhere((package) => package.potentialDirs.contains(dir), orElse: () => null);
+    return package?.packageName;
+  }
+
+  String getCurrentAppName(String packageName) {
+    final package = _packages.firstWhere((package) => package.packageName == packageName, orElse: () => null);
+    return package?.currentLabel;
   }
 }
 
 enum AlbumType { regular, app, camera, download, screenRecordings, screenshots }
 
+class Package {
+  final String packageName, currentLabel, englishLabel;
+  final bool categoryLauncher, isSystem;
+  final Set<String> ownedDirs = {};
+
+  Package({
+    this.packageName,
+    this.currentLabel,
+    this.englishLabel,
+    this.categoryLauncher,
+    this.isSystem,
+  });
+
+  factory Package.fromMap(Map map) {
+    return Package(
+      packageName: map['packageName'],
+      currentLabel: map['currentLabel'],
+      englishLabel: map['englishLabel'],
+      categoryLauncher: map['categoryLauncher'],
+      isSystem: map['isSystem'],
+    );
+  }
+
+  Set<String> get potentialDirs => [
+        currentLabel,
+        englishLabel,
+        ...ownedDirs,
+      ].where((dir) => dir != null).toSet();
+
+  @override
+  String toString() => '$runtimeType#${shortHash(this)}{packageName=$packageName, categoryLauncher=$categoryLauncher, isSystem=$isSystem, currentLabel=$currentLabel, englishLabel=$englishLabel, ownedDirs=$ownedDirs}';
+}
+
 class StorageVolume {
   final String description, path, state;
   final bool isEmulated, isPrimary, isRemovable;

lib/utils/constants.dart

@@ -29,14 +29,14 @@ class Constants {
     Dependency(
       name: 'AndroidX Core-KTX',
       license: 'Apache 2.0',
-      licenseUrl: 'https://android.googlesource.com/platform/frameworks/support/+/androidx-master-dev/LICENSE.txt',
-      sourceUrl: 'https://android.googlesource.com/platform/frameworks/support/+/androidx-master-dev/core/core-ktx',
+      licenseUrl: 'https://android.googlesource.com/platform/frameworks/support/+/androidx-main/LICENSE.txt',
+      sourceUrl: 'https://android.googlesource.com/platform/frameworks/support/+/androidx-main/core/core-ktx',
     ),
     Dependency(
       name: 'AndroidX Exifinterface',
       license: 'Apache 2.0',
-      licenseUrl: 'https://android.googlesource.com/platform/frameworks/support/+/androidx-master-dev/LICENSE.txt',
-      sourceUrl: 'https://android.googlesource.com/platform/frameworks/support/+/androidx-master-dev/exifinterface/exifinterface',
+      licenseUrl: 'https://android.googlesource.com/platform/frameworks/support/+/androidx-main/LICENSE.txt',
+      sourceUrl: 'https://android.googlesource.com/platform/frameworks/support/+/androidx-main/exifinterface/exifinterface',
     ),
     Dependency(
       name: 'Android-TiffBitmapFactory',
@@ -83,18 +83,18 @@ class Constants {
       licenseUrl: 'https://github.com/dart-lang/collection/blob/master/LICENSE',
       sourceUrl: 'https://github.com/dart-lang/collection',
     ),
+    Dependency(
+      name: 'Connectivity',
+      license: 'BSD 3-Clause',
+      licenseUrl: 'https://github.com/flutter/plugins/blob/master/packages/connectivity/connectivity/LICENSE',
+      sourceUrl: 'https://github.com/flutter/plugins/blob/master/packages/connectivity/connectivity',
+    ),
     Dependency(
       name: 'Decorated Icon',
       license: 'MIT',
       licenseUrl: 'https://github.com/benPesso/flutter_decorated_icon/blob/master/LICENSE',
       sourceUrl: 'https://github.com/benPesso/flutter_decorated_icon',
     ),
-    Dependency(
-      name: 'Draggable Scrollbar',
-      license: 'MIT',
-      licenseUrl: 'https://github.com/fluttercommunity/flutter-draggable-scrollbar/blob/master/LICENSE',
-      sourceUrl: 'https://github.com/fluttercommunity/flutter-draggable-scrollbar',
-    ),
     Dependency(
       name: 'Event Bus',
       license: 'MIT',

lib/widgets/collection/collection_page.dart

@@ -1,7 +1,7 @@
 import 'package:aves/model/source/collection_lens.dart';
 import 'package:aves/widgets/collection/thumbnail_collection.dart';
+import 'package:aves/widgets/common/basic/insets.dart';
 import 'package:aves/widgets/common/behaviour/double_back_pop.dart';
-import 'package:aves/widgets/common/gesture_area_protector.dart';
 import 'package:aves/widgets/common/providers/media_query_data_provider.dart';
 import 'package:aves/widgets/drawer/app_drawer.dart';
 import 'package:flutter/foundation.dart';

lib/widgets/collection/entry_set_action_delegate.dart

@@ -2,11 +2,13 @@ import 'dart:async';
 
 import 'package:aves/model/actions/collection_actions.dart';
 import 'package:aves/model/actions/entry_actions.dart';
-import 'package:aves/model/image_entry.dart';
+import 'package:aves/model/actions/move_type.dart';
+import 'package:aves/model/entry.dart';
 import 'package:aves/model/source/collection_lens.dart';
 import 'package:aves/model/source/collection_source.dart';
 import 'package:aves/services/android_app_service.dart';
 import 'package:aves/services/image_file_service.dart';
+import 'package:aves/services/image_op_events.dart';
 import 'package:aves/widgets/common/action_mixins/feedback.dart';
 import 'package:aves/widgets/common/action_mixins/permission_aware.dart';
 import 'package:aves/widgets/common/action_mixins/size_aware.dart';
@@ -22,7 +24,7 @@ class EntrySetActionDelegate with FeedbackMixin, PermissionAwareMixin, SizeAware
 
   CollectionSource get source => collection.source;
 
-  Set<ImageEntry> get selection => collection.selection;
+  Set<AvesEntry> get selection => collection.selection;
 
   EntrySetActionDelegate({
     @required this.collection,
@@ -46,10 +48,10 @@ class EntrySetActionDelegate with FeedbackMixin, PermissionAwareMixin, SizeAware
   void onCollectionActionSelected(BuildContext context, CollectionAction action) {
     switch (action) {
       case CollectionAction.copy:
-        _moveSelection(context, copy: true);
+        _moveSelection(context, moveType: MoveType.copy);
         break;
       case CollectionAction.move:
-        _moveSelection(context, copy: false);
+        _moveSelection(context, moveType: MoveType.move);
         break;
       case CollectionAction.refreshMetadata:
         source.refreshMetadata(selection);
@@ -61,12 +63,12 @@ class EntrySetActionDelegate with FeedbackMixin, PermissionAwareMixin, SizeAware
     }
   }
 
-  Future<void> _moveSelection(BuildContext context, {@required bool copy}) async {
+  Future<void> _moveSelection(BuildContext context, {@required MoveType moveType}) async {
     final destinationAlbum = await Navigator.push(
       context,
       MaterialPageRoute<String>(
         settings: RouteSettings(name: AlbumPickPage.routeName),
-        builder: (context) => AlbumPickPage(source: source, copy: copy),
+        builder: (context) => AlbumPickPage(source: source, moveType: moveType),
       ),
     );
     if (destinationAlbum == null || destinationAlbum.isEmpty) return;
@@ -74,16 +76,17 @@ class EntrySetActionDelegate with FeedbackMixin, PermissionAwareMixin, SizeAware
 
     if (!await checkStoragePermission(context, selection)) return;
 
-    if (!await checkFreeSpaceForMove(context, selection, destinationAlbum, copy)) return;
+    if (!await checkFreeSpaceForMove(context, selection, destinationAlbum, moveType)) return;
 
+    final copy = moveType == MoveType.copy;
+    final selectionCount = selection.length;
     showOpReport<MoveOpEvent>(
       context: context,
-      selection: selection,
       opStream: ImageFileService.move(selection, copy: copy, destinationAlbum: destinationAlbum),
+      itemCount: selectionCount,
       onDone: (processed) async {
         final movedOps = processed.where((e) => e.success);
         final movedCount = movedOps.length;
-        final selectionCount = selection.length;
         if (movedCount < selectionCount) {
           final count = selectionCount - movedCount;
           showFeedback(context, 'Failed to ${copy ? 'copy' : 'move'} ${Intl.plural(count, one: '$count item', other: '$count items')}');
@@ -129,14 +132,14 @@ class EntrySetActionDelegate with FeedbackMixin, PermissionAwareMixin, SizeAware
 
     if (!await checkStoragePermission(context, selection)) return;
 
+    final selectionCount = selection.length;
     showOpReport<ImageOpEvent>(
       context: context,
-      selection: selection,
       opStream: ImageFileService.delete(selection),
+      itemCount: selectionCount,
       onDone: (processed) {
         final deletedUris = processed.where((e) => e.success).map((e) => e.uri).toList();
         final deletedCount = deletedUris.length;
-        final selectionCount = selection.length;
         if (deletedCount < selectionCount) {
           final count = selectionCount - deletedCount;
           showFeedback(context, 'Failed to delete ${Intl.plural(count, one: '$count item', other: '$count items')}');

lib/widgets/collection/filter_bar.dart

@@ -25,7 +25,7 @@ class FilterBar extends StatefulWidget implements PreferredSizeWidget {
 }
 
 class _FilterBarState extends State<FilterBar> {
-  final GlobalKey<AnimatedListState> _animatedListKey = GlobalKey();
+  final GlobalKey<AnimatedListState> _animatedListKey = GlobalKey(debugLabel: 'filter-bar-animated-list');
   CollectionFilter _userRemovedFilter;
 
   @override

lib/widgets/collection/grid/section_layout.dart

@@ -1,4 +1,4 @@
-import 'package:aves/model/image_entry.dart';
+import 'package:aves/model/entry.dart';
 import 'package:aves/model/source/collection_lens.dart';
 import 'package:aves/model/source/section_keys.dart';
 import 'package:aves/widgets/collection/grid/headers/any.dart';
@@ -6,7 +6,7 @@ import 'package:aves/widgets/common/grid/section_layout.dart';
 import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
 
-class SectionedEntryListLayoutProvider extends SectionedListLayoutProvider<ImageEntry> {
+class SectionedEntryListLayoutProvider extends SectionedListLayoutProvider<AvesEntry> {
   final CollectionLens collection;
 
   const SectionedEntryListLayoutProvider({
@@ -14,7 +14,7 @@ class SectionedEntryListLayoutProvider extends SectionedListLayoutProvider<Image
     @required double scrollableWidth,
     @required int columnCount,
     @required double tileExtent,
-    @required Widget Function(ImageEntry entry) tileBuilder,
+    @required Widget Function(AvesEntry entry) tileBuilder,
     @required Widget child,
   }) : super(
           scrollableWidth: scrollableWidth,
@@ -28,7 +28,7 @@ class SectionedEntryListLayoutProvider extends SectionedListLayoutProvider<Image
   bool get showHeaders => collection.showHeaders;
 
   @override
-  Map<SectionKey, List<ImageEntry>> get sections => collection.sections;
+  Map<SectionKey, List<AvesEntry>> get sections => collection.sections;
 
   @override
   double getHeaderExtent(BuildContext context, SectionKey sectionKey) {

lib/widgets/collection/grid/selector.dart

@@ -1,9 +1,10 @@
 import 'dart:async';
 import 'dart:math';
 
-import 'package:aves/model/image_entry.dart';
+import 'package:aves/model/entry.dart';
 import 'package:aves/model/source/collection_lens.dart';
 import 'package:aves/utils/math_utils.dart';
+import 'package:aves/widgets/common/extensions/media_query.dart';
 import 'package:aves/widgets/common/grid/section_layout.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter/rendering.dart';
@@ -38,7 +39,7 @@ class _GridSelectionGestureDetectorState extends State<GridSelectionGestureDetec
 
   CollectionLens get collection => widget.collection;
 
-  List<ImageEntry> get entries => collection.sortedEntries;
+  List<AvesEntry> get entries => collection.sortedEntries;
 
   ScrollController get scrollController => widget.scrollController;
 
@@ -62,7 +63,7 @@ class _GridSelectionGestureDetectorState extends State<GridSelectionGestureDetec
               _lastToIndex = _fromIndex;
               _scrollableInsets = EdgeInsets.only(
                 top: appBarHeight,
-                bottom: context.read<MediaQueryData>().viewInsets.bottom,
+                bottom: context.read<MediaQueryData>().effectiveBottomPadding,
               );
               _scrollSpeedFactor = 0;
               _pressing = true;
@@ -130,12 +131,12 @@ class _GridSelectionGestureDetectorState extends State<GridSelectionGestureDetec
     }
   }
 
-  ImageEntry _getEntryAt(Offset localPosition) {
+  AvesEntry _getEntryAt(Offset localPosition) {
     // as of Flutter v1.22.5, `hitTest` on the `ScrollView` render object works fine when it is static,
     // but when it is scrolling (through controller animation), result is incomplete and children are missing,
     // so we use custom layout computation instead to find the entry.
     final offset = Offset(0, scrollController.offset - appBarHeight) + localPosition;
-    final sectionedListLayout = context.read<SectionedListLayout<ImageEntry>>();
+    final sectionedListLayout = context.read<SectionedListLayout<AvesEntry>>();
     return sectionedListLayout.getItemAt(offset);
   }
 

lib/widgets/collection/grid/thumbnail.dart

@@ -1,5 +1,5 @@
 import 'package:aves/main.dart';
-import 'package:aves/model/image_entry.dart';
+import 'package:aves/model/entry.dart';
 import 'package:aves/model/source/collection_lens.dart';
 import 'package:aves/services/viewer_service.dart';
 import 'package:aves/widgets/collection/thumbnail/decorated.dart';
@@ -10,7 +10,7 @@ import 'package:flutter/material.dart';
 
 class InteractiveThumbnail extends StatelessWidget {
   final CollectionLens collection;
-  final ImageEntry entry;
+  final AvesEntry entry;
   final double tileExtent;
   final ValueNotifier<bool> isScrollingNotifier;
 
@@ -53,9 +53,15 @@ class InteractiveThumbnail extends StatelessWidget {
     Navigator.push(
       context,
       TransparentMaterialPageRoute(
-        settings: RouteSettings(name: MultiEntryViewerPage.routeName),
-        pageBuilder: (c, a, sa) => MultiEntryViewerPage(
-          collection: collection,
+        settings: RouteSettings(name: EntryViewerPage.routeName),
+        pageBuilder: (c, a, sa) => EntryViewerPage(
+          collection: CollectionLens(
+            source: collection.source,
+            filters: collection.filters,
+            groupFactor: collection.groupFactor,
+            sortFactor: collection.sortFactor,
+            listenToSource: false,
+          ),
           initialEntry: entry,
         ),
       ),

lib/widgets/collection/thumbnail/decorated.dart

@@ -1,4 +1,4 @@
-import 'package:aves/model/image_entry.dart';
+import 'package:aves/model/entry.dart';
 import 'package:aves/model/source/collection_lens.dart';
 import 'package:aves/widgets/collection/thumbnail/overlay.dart';
 import 'package:aves/widgets/collection/thumbnail/raster.dart';
@@ -6,7 +6,7 @@ import 'package:aves/widgets/collection/thumbnail/vector.dart';
 import 'package:flutter/material.dart';
 
 class DecoratedThumbnail extends StatelessWidget {
-  final ImageEntry entry;
+  final AvesEntry entry;
   final double extent;
   final CollectionLens collection;
   final ValueNotifier<bool> isScrollingNotifier;

lib/widgets/collection/thumbnail/error.dart

@@ -1,9 +1,9 @@
-import 'package:aves/model/image_entry.dart';
+import 'package:aves/model/entry.dart';
 import 'package:aves/utils/mime_utils.dart';
 import 'package:flutter/material.dart';
 
 class ErrorThumbnail extends StatelessWidget {
-  final ImageEntry entry;
+  final AvesEntry entry;
   final double extent;
   final String tooltip;
 

lib/widgets/collection/thumbnail/overlay.dart

@@ -1,7 +1,7 @@
 import 'dart:math';
 
 import 'package:aves/model/highlight.dart';
-import 'package:aves/model/image_entry.dart';
+import 'package:aves/model/entry.dart';
 import 'package:aves/model/settings/settings.dart';
 import 'package:aves/model/source/collection_lens.dart';
 import 'package:aves/model/source/enums.dart';
@@ -14,7 +14,7 @@ import 'package:provider/provider.dart';
 import 'package:tuple/tuple.dart';
 
 class ThumbnailEntryOverlay extends StatelessWidget {
-  final ImageEntry entry;
+  final AvesEntry entry;
   final double extent;
 
   const ThumbnailEntryOverlay({
@@ -61,7 +61,7 @@ class ThumbnailEntryOverlay extends StatelessWidget {
 }
 
 class ThumbnailSelectionOverlay extends StatelessWidget {
-  final ImageEntry entry;
+  final AvesEntry entry;
   final double extent;
 
   const ThumbnailSelectionOverlay({
@@ -121,7 +121,7 @@ class ThumbnailSelectionOverlay extends StatelessWidget {
 }
 
 class ThumbnailHighlightOverlay extends StatefulWidget {
-  final ImageEntry entry;
+  final AvesEntry entry;
   final double extent;
 
   const ThumbnailHighlightOverlay({
@@ -137,7 +137,7 @@ class ThumbnailHighlightOverlay extends StatefulWidget {
 class _ThumbnailHighlightOverlayState extends State<ThumbnailHighlightOverlay> {
   final ValueNotifier<bool> _highlightedNotifier = ValueNotifier(false);
 
-  ImageEntry get entry => widget.entry;
+  AvesEntry get entry => widget.entry;
 
   @override
   Widget build(BuildContext context) {

lib/widgets/collection/thumbnail/raster.dart

@@ -1,17 +1,14 @@
-import 'dart:math';
-
 import 'package:aves/image_providers/thumbnail_provider.dart';
-import 'package:aves/image_providers/uri_image_provider.dart';
-import 'package:aves/model/image_entry.dart';
+import 'package:aves/model/entry.dart';
+import 'package:aves/model/entry_images.dart';
 import 'package:aves/theme/durations.dart';
 import 'package:aves/widgets/collection/thumbnail/error.dart';
 import 'package:aves/widgets/common/fx/transition_image.dart';
 import 'package:flutter/material.dart';
 
 class RasterImageThumbnail extends StatefulWidget {
-  final ImageEntry entry;
+  final AvesEntry entry;
   final double extent;
-  final int page;
   final ValueNotifier<bool> isScrollingNotifier;
   final Object heroTag;
 
@@ -19,7 +16,6 @@ class RasterImageThumbnail extends StatefulWidget {
     Key key,
     @required this.entry,
     @required this.extent,
-    this.page = 0,
     this.isScrollingNotifier,
     this.heroTag,
   }) : super(key: key);
@@ -31,19 +27,12 @@ class RasterImageThumbnail extends StatefulWidget {
 class _RasterImageThumbnailState extends State<RasterImageThumbnail> {
   ThumbnailProvider _fastThumbnailProvider, _sizedThumbnailProvider;
 
-  ImageEntry get entry => widget.entry;
-
-  int get page => widget.page;
+  AvesEntry get entry => widget.entry;
 
   double get extent => widget.extent;
 
   Object get heroTag => widget.heroTag;
 
-  // we standardize the thumbnail loading dimension by taking the nearest larger power of 2
-  // so that there are less variants of the thumbnails to load and cache
-  // it increases the chance of cache hit when loading similarly sized columns (e.g. on orientation change)
-  double get requestExtent => pow(2, (log(extent) / log(2)).ceil()).toDouble();
-
   @override
   void initState() {
     super.initState();
@@ -78,14 +67,8 @@ class _RasterImageThumbnailState extends State<RasterImageThumbnail> {
   void _initProvider() {
     if (!entry.canDecode) return;
 
-    _fastThumbnailProvider = ThumbnailProvider(
-      ThumbnailProviderKey.fromEntry(entry, page: page),
-    );
-    if (!entry.isVideo) {
-      _sizedThumbnailProvider = ThumbnailProvider(
-        ThumbnailProviderKey.fromEntry(entry, page: page, extent: requestExtent),
-      );
-    }
+    _fastThumbnailProvider = entry.getThumbnail();
+    _sizedThumbnailProvider = entry.getThumbnail(extent: extent);
   }
 
   void _pauseProvider() {
@@ -148,22 +131,8 @@ class _RasterImageThumbnailState extends State<RasterImageThumbnail> {
         : Hero(
             tag: heroTag,
             flightShuttleBuilder: (flight, animation, direction, fromHero, toHero) {
-              ImageProvider heroImageProvider = _fastThumbnailProvider;
-              if (!entry.isVideo) {
-                final imageProvider = UriImage(
-                  uri: entry.uri,
-                  mimeType: entry.mimeType,
-                  page: page,
-                  rotationDegrees: entry.rotationDegrees,
-                  isFlipped: entry.isFlipped,
-                  expectedContentLength: entry.sizeBytes,
-                );
-                if (imageCache.statusForKey(imageProvider).keepAlive) {
-                  heroImageProvider = imageProvider;
-                }
-              }
               return TransitionImage(
-                image: heroImageProvider,
+                image: entry.getBestThumbnail(extent),
                 animation: animation,
               );
             },

lib/widgets/collection/thumbnail/vector.dart

@@ -1,5 +1,5 @@
 import 'package:aves/image_providers/uri_picture_provider.dart';
-import 'package:aves/model/image_entry.dart';
+import 'package:aves/model/entry.dart';
 import 'package:aves/model/settings/entry_background.dart';
 import 'package:aves/model/settings/settings.dart';
 import 'package:aves/widgets/common/fx/checkered_decoration.dart';
@@ -8,7 +8,7 @@ import 'package:flutter_svg/flutter_svg.dart';
 import 'package:provider/provider.dart';
 
 class VectorImageThumbnail extends StatelessWidget {
-  final ImageEntry entry;
+  final AvesEntry entry;
   final double extent;
   final Object heroTag;
 
@@ -29,10 +29,10 @@ class VectorImageThumbnail extends StatelessWidget {
           return LayoutBuilder(
             builder: (context, constraints) {
               final availableSize = constraints.biggest;
-              final fitSize = applyBoxFit(fit, entry.getDisplaySize(), availableSize).destination;
+              final fitSize = applyBoxFit(fit, entry.displaySize, availableSize).destination;
               final offset = fitSize / 2 - availableSize / 2;
-              final child = DecoratedBox(
-                decoration: CheckeredDecoration(checkSize: extent / 8, offset: offset),
+              final child = CustomPaint(
+                painter: CheckeredPainter(checkSize: extent / 8, offset: offset),
                 child: SvgPicture(
                   UriPicture(
                     uri: entry.uri,

lib/widgets/collection/thumbnail_collection.dart

@@ -4,7 +4,7 @@ import 'package:aves/main.dart';
 import 'package:aves/model/filters/favourite.dart';
 import 'package:aves/model/filters/mime.dart';
 import 'package:aves/model/highlight.dart';
-import 'package:aves/model/image_entry.dart';
+import 'package:aves/model/entry.dart';
 import 'package:aves/model/source/collection_lens.dart';
 import 'package:aves/model/source/collection_source.dart';
 import 'package:aves/ref/mime_types.dart';
@@ -16,15 +16,17 @@ import 'package:aves/widgets/collection/grid/section_layout.dart';
 import 'package:aves/widgets/collection/grid/selector.dart';
 import 'package:aves/widgets/collection/grid/thumbnail.dart';
 import 'package:aves/widgets/collection/thumbnail/decorated.dart';
-import 'package:aves/widgets/common/behaviour/routes.dart';
+import 'package:aves/widgets/common/basic/draggable_scrollbar.dart';
+import 'package:aves/widgets/common/basic/insets.dart';
 import 'package:aves/widgets/common/behaviour/sloppy_scroll_physics.dart';
+import 'package:aves/widgets/common/extensions/build_context.dart';
+import 'package:aves/widgets/common/extensions/media_query.dart';
 import 'package:aves/widgets/common/grid/section_layout.dart';
 import 'package:aves/widgets/common/grid/sliver.dart';
 import 'package:aves/widgets/common/identity/scroll_thumb.dart';
 import 'package:aves/widgets/common/providers/highlight_info_provider.dart';
 import 'package:aves/widgets/common/scaling.dart';
 import 'package:aves/widgets/common/tile_extent_manager.dart';
-import 'package:draggable_scrollbar/draggable_scrollbar.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter/rendering.dart';
 import 'package:flutter_staggered_animations/flutter_staggered_animations.dart';
@@ -34,7 +36,7 @@ class ThumbnailCollection extends StatelessWidget {
   final ValueNotifier<double> _appBarHeightNotifier = ValueNotifier(0);
   final ValueNotifier<double> _tileExtentNotifier = ValueNotifier(0);
   final ValueNotifier<bool> _isScrollingNotifier = ValueNotifier(false);
-  final GlobalKey _scrollableKey = GlobalKey();
+  final GlobalKey _scrollableKey = GlobalKey(debugLabel: 'thumbnail-collection-scrollable');
 
   static const columnCountDefault = 4;
   static const extentMin = 46.0;
@@ -44,6 +46,7 @@ class ThumbnailCollection extends StatelessWidget {
   Widget build(BuildContext context) {
     return HighlightInfoProvider(
       child: SafeArea(
+        bottom: false,
         child: LayoutBuilder(
           builder: (context, constraints) {
             final viewportSize = constraints.biggest;
@@ -79,7 +82,7 @@ class ThumbnailCollection extends StatelessWidget {
                   ),
                 );
 
-                final scaler = GridScaleGestureDetector<ImageEntry>(
+                final scaler = GridScaleGestureDetector<AvesEntry>(
                   tileExtentManager: tileExtentManager,
                   scrollableKey: _scrollableKey,
                   appBarHeightNotifier: _appBarHeightNotifier,
@@ -103,7 +106,7 @@ class ThumbnailCollection extends StatelessWidget {
                     highlightable: false,
                   ),
                   getScaledItemTileRect: (context, entry) {
-                    final sectionedListLayout = context.read<SectionedListLayout<ImageEntry>>();
+                    final sectionedListLayout = context.read<SectionedListLayout<AvesEntry>>();
                     return sectionedListLayout.getTileRect(entry) ?? Rect.zero;
                   },
                   onScaled: (entry) => Provider.of<HighlightInfo>(context, listen: false).add(entry),
@@ -192,10 +195,12 @@ class _CollectionScrollViewState extends State<CollectionScrollView> {
   }
 
   void _registerWidget(CollectionScrollView widget) {
+    widget.collection.filterChangeNotifier.addListener(_onFilterChange);
     widget.scrollController.addListener(_onScrollChange);
   }
 
   void _unregisterWidget(CollectionScrollView widget) {
+    widget.collection.filterChangeNotifier.removeListener(_onFilterChange);
     widget.scrollController.removeListener(_onScrollChange);
   }
 
@@ -220,15 +225,8 @@ class _CollectionScrollViewState extends State<CollectionScrollView> {
                 child: _buildEmptyCollectionPlaceholder(collection),
                 hasScrollBody: false,
               )
-            : SectionedListSliver<ImageEntry>(),
-        SliverToBoxAdapter(
-          child: Selector<MediaQueryData, double>(
-            selector: (context, mq) => mq.viewInsets.bottom,
-            builder: (context, mqViewInsetsBottom, child) {
-              return SizedBox(height: mqViewInsetsBottom);
-            },
-          ),
-        ),
+            : SectionedListSliver<AvesEntry>(),
+        BottomPaddingSliver(),
       ],
     );
   }
@@ -237,10 +235,10 @@ class _CollectionScrollViewState extends State<CollectionScrollView> {
     return ValueListenableBuilder<double>(
       valueListenable: widget.appBarHeightNotifier,
       builder: (context, appBarHeight, child) => Selector<MediaQueryData, double>(
-        selector: (context, mq) => mq.viewInsets.bottom,
-        builder: (context, mqViewInsetsBottom, child) => DraggableScrollbar(
-          heightScrollThumb: avesScrollThumbHeight,
+        selector: (context, mq) => mq.effectiveBottomPadding,
+        builder: (context, mqPaddingBottom, child) => DraggableScrollbar(
           backgroundColor: Colors.white,
+          scrollThumbHeight: avesScrollThumbHeight,
           scrollThumbBuilder: avesScrollThumbBuilder(
             height: avesScrollThumbHeight,
             backgroundColor: Colors.white,
@@ -249,7 +247,7 @@ class _CollectionScrollViewState extends State<CollectionScrollView> {
           padding: EdgeInsets.only(
             // padding to keep scroll thumb between app bar above and nav bar below
             top: appBarHeight,
-            bottom: mqViewInsetsBottom,
+            bottom: mqPaddingBottom,
           ),
           child: scrollView,
         ),
@@ -285,6 +283,8 @@ class _CollectionScrollViewState extends State<CollectionScrollView> {
     );
   }
 
+  void _onFilterChange() => widget.scrollController.jumpTo(0);
+
   void _onScrollChange() {
     widget.isScrollingNotifier.value = true;
     _stopScrollMonitoringTimer();

lib/widgets/common/action_mixins/feedback.dart

@@ -1,5 +1,3 @@
-import 'package:aves/model/image_entry.dart';
-import 'package:aves/services/image_file_service.dart';
 import 'package:aves/theme/durations.dart';
 import 'package:flushbar/flushbar.dart';
 import 'package:flutter/material.dart';
@@ -27,19 +25,66 @@ mixin FeedbackMixin {
 
   // report overlay for multiple operations
 
-  OverlayEntry _opReportOverlayEntry;
-
-  void showOpReport<T extends ImageOpEvent>({
+  void showOpReport<T>({
     @required BuildContext context,
-    @required Set<ImageEntry> selection,
     @required Stream<T> opStream,
-    @required void Function(Set<T> processed) onDone,
+    @required int itemCount,
+    void Function(Set<T> processed) onDone,
   }) {
+    OverlayEntry _opReportOverlayEntry;
+    _opReportOverlayEntry = OverlayEntry(
+      builder: (context) => ReportOverlay<T>(
+        opStream: opStream,
+        itemCount: itemCount,
+        onDone: (processed) {
+          _opReportOverlayEntry.remove();
+          onDone?.call(processed);
+        },
+      ),
+    );
+    Overlay.of(context).insert(_opReportOverlayEntry);
+  }
+}
+
+class ReportOverlay<T> extends StatefulWidget {
+  final Stream<T> opStream;
+  final int itemCount;
+  final void Function(Set<T> processed) onDone;
+
+  const ReportOverlay({
+    @required this.opStream,
+    @required this.itemCount,
+    @required this.onDone,
+  });
+
+  @override
+  _ReportOverlayState createState() => _ReportOverlayState<T>();
+}
+
+class _ReportOverlayState<T> extends State<ReportOverlay<T>> with SingleTickerProviderStateMixin {
   final processed = <T>{};
+  AnimationController _animationController;
+  Animation<double> _animation;
+
+  Stream<T> get opStream => widget.opStream;
+
+  @override
+  void initState() {
+    super.initState();
+
+    _animationController = AnimationController(
+      duration: Durations.collectionOpOverlayAnimation,
+      vsync: this,
+    );
+    _animation = CurvedAnimation(
+      parent: _animationController,
+      curve: Curves.easeOutQuad,
+    );
+    _animationController.forward();
 
     // do not handle completion inside `StreamBuilder`
     // as it could be called multiple times
-    Future<void> onComplete() => _hideOpReportOverlay().then((_) => onDone(processed));
+    Future<void> onComplete() => _animationController.reverse().then((_) => widget.onDone(processed));
     opStream.listen(
       processed.add,
       onError: (error) {
@@ -48,17 +93,34 @@ mixin FeedbackMixin {
       },
       onDone: onComplete,
     );
+  }
 
-    _opReportOverlayEntry = OverlayEntry(
-      builder: (context) {
+  @override
+  void dispose() {
+    _animationController.dispose();
+    super.dispose();
+  }
+
+  @override
+  Widget build(BuildContext context) {
     return AbsorbPointer(
       child: StreamBuilder<T>(
           stream: opStream,
           builder: (context, snapshot) {
-                Widget child = SizedBox.shrink();
-                if (!snapshot.hasError) {
-                  final percent = processed.length.toDouble() / selection.length;
-                  child = CircularPercentIndicator(
+            final percent = processed.length.toDouble() / widget.itemCount;
+            return FadeTransition(
+              opacity: _animation,
+              child: Container(
+                decoration: BoxDecoration(
+                  gradient: RadialGradient(
+                    colors: [
+                      Colors.black,
+                      Colors.black54,
+                    ],
+                  ),
+                ),
+                child: Center(
+                  child: CircularPercentIndicator(
                     percent: percent,
                     lineWidth: 16,
                     radius: 160,
@@ -67,22 +129,11 @@ mixin FeedbackMixin {
                     animation: true,
                     center: Text(NumberFormat.percentPattern().format(percent)),
                     animateFromLastPercent: true,
-                  );
-                }
-                return AnimatedSwitcher(
-                  duration: Durations.collectionOpOverlayAnimation,
-                  child: child,
+                  ),
+                ),
+              ),
             );
           }),
     );
-      },
-    );
-    Overlay.of(context).insert(_opReportOverlayEntry);
-  }
-
-  Future<void> _hideOpReportOverlay() async {
-    await Future.delayed(Durations.collectionOpOverlayAnimation * timeDilation);
-    _opReportOverlayEntry.remove();
-    _opReportOverlayEntry = null;
   }
 }

lib/widgets/common/action_mixins/permission_aware.dart

@@ -1,10 +1,10 @@
-import 'package:aves/model/image_entry.dart';
+import 'package:aves/model/entry.dart';
 import 'package:aves/services/android_file_service.dart';
 import 'package:aves/widgets/dialogs/aves_dialog.dart';
 import 'package:flutter/material.dart';
 
 mixin PermissionAwareMixin {
-  Future<bool> checkStoragePermission(BuildContext context, Set<ImageEntry> entries) {
+  Future<bool> checkStoragePermission(BuildContext context, Set<AvesEntry> entries) {
     return checkStoragePermissionForAlbums(context, entries.where((e) => e.path != null).map((e) => e.directory).toSet());
   }
 

lib/widgets/common/action_mixins/size_aware.dart

@@ -1,7 +1,8 @@
 import 'dart:async';
 import 'dart:math';
 
-import 'package:aves/model/image_entry.dart';
+import 'package:aves/model/actions/move_type.dart';
+import 'package:aves/model/entry.dart';
 import 'package:aves/services/android_file_service.dart';
 import 'package:aves/utils/android_file_utils.dart';
 import 'package:aves/utils/file_utils.dart';
@@ -11,21 +12,30 @@ import 'package:flutter/material.dart';
 import 'package:flutter/widgets.dart';
 
 mixin SizeAwareMixin {
-  Future<bool> checkFreeSpaceForMove(BuildContext context, Set<ImageEntry> selection, String destinationAlbum, bool copy) async {
+  Future<bool> checkFreeSpaceForMove(
+    BuildContext context,
+    Set<AvesEntry> selection,
+    String destinationAlbum,
+    MoveType moveType,
+  ) async {
     final destinationVolume = androidFileUtils.getStorageVolume(destinationAlbum);
     final free = await AndroidFileService.getFreeSpace(destinationVolume);
     int needed;
     int sumSize(sum, entry) => sum + entry.sizeBytes;
-    if (copy) {
+    switch (moveType) {
+      case MoveType.copy:
+      case MoveType.export:
         needed = selection.fold(0, sumSize);
-    } else {
+        break;
+      case MoveType.move:
         // when moving, we only need space for the entries that are not already on the destination volume
-      final byVolume = groupBy<ImageEntry, StorageVolume>(selection, (entry) => androidFileUtils.getStorageVolume(entry.path));
+        final byVolume = groupBy<AvesEntry, StorageVolume>(selection, (entry) => androidFileUtils.getStorageVolume(entry.path));
         final otherVolumes = byVolume.keys.where((volume) => volume != destinationVolume);
         final fromOtherVolumes = otherVolumes.fold<int>(0, (sum, volume) => sum + byVolume[volume].fold(0, sumSize));
         // and we need at least as much space as the largest entry because individual entries are copied then deleted
         final largestSingle = selection.fold<int>(0, (largest, entry) => max(largest, entry.sizeBytes));
         needed = max(fromOtherVolumes, largestSingle);
+        break;
     }
 
     final hasEnoughSpace = needed < free;

lib/widgets/common/basic/draggable_scrollbar.dart

@@ -0,0 +1,388 @@
+import 'dart:async';
+
+import 'package:flutter/foundation.dart';
+import 'package:flutter/material.dart';
+
+/*
+  This is derived from `draggable_scrollbar` package v0.0.4:
+  - removed default thumb builders
+  - allow any `ScrollView` as child
+  - allow any `Widget` as label content
+  - moved out constraints responsibility
+  - various extent & thumb positioning fixes
+ */
+
+/// Build the Scroll Thumb and label using the current configuration
+typedef ScrollThumbBuilder = Widget Function(
+  Color backgroundColor,
+  Animation<double> thumbAnimation,
+  Animation<double> labelAnimation,
+  double height, {
+  Widget labelText,
+});
+
+/// Build a Text widget using the current scroll offset
+typedef LabelTextBuilder = Widget Function(double offsetY);
+
+/// A widget that will display a BoxScrollView with a ScrollThumb that can be dragged
+/// for quick navigation of the BoxScrollView.
+class DraggableScrollbar extends StatefulWidget {
+  /// The background color of the label and thumb
+  final Color backgroundColor;
+
+  /// The height of the scroll thumb
+  final double scrollThumbHeight;
+
+  /// A function that builds a thumb using the current configuration
+  final ScrollThumbBuilder scrollThumbBuilder;
+
+  /// The amount of padding that should surround the thumb
+  final EdgeInsetsGeometry padding;
+
+  /// Determines how quickly the scrollbar will animate in and out
+  final Duration scrollbarAnimationDuration;
+
+  /// How long should the thumb be visible before fading out
+  final Duration scrollbarTimeToFade;
+
+  /// Build a Text widget from the current offset in the BoxScrollView
+  final LabelTextBuilder labelTextBuilder;
+
+  /// The ScrollController for the BoxScrollView
+  final ScrollController controller;
+
+  /// The view that will be scrolled with the scroll thumb
+  final ScrollView child;
+
+  DraggableScrollbar({
+    Key key,
+    @required this.backgroundColor,
+    @required this.scrollThumbHeight,
+    @required this.scrollThumbBuilder,
+    @required this.controller,
+    this.padding,
+    this.scrollbarAnimationDuration = const Duration(milliseconds: 300),
+    this.scrollbarTimeToFade = const Duration(milliseconds: 600),
+    this.labelTextBuilder,
+    @required this.child,
+  })  : assert(controller != null),
+        assert(scrollThumbBuilder != null),
+        assert(child.scrollDirection == Axis.vertical),
+        super(key: key);
+
+  @override
+  _DraggableScrollbarState createState() => _DraggableScrollbarState();
+
+  static Widget buildScrollThumbAndLabel({
+    @required Widget scrollThumb,
+    @required Color backgroundColor,
+    @required Animation<double> thumbAnimation,
+    @required Animation<double> labelAnimation,
+    @required Widget labelText,
+  }) {
+    final scrollThumbAndLabel = labelText == null
+        ? scrollThumb
+        : Row(
+            mainAxisSize: MainAxisSize.min,
+            mainAxisAlignment: MainAxisAlignment.end,
+            children: [
+              ScrollLabel(
+                animation: labelAnimation,
+                child: labelText,
+                backgroundColor: backgroundColor,
+              ),
+              scrollThumb,
+            ],
+          );
+    return SlideFadeTransition(
+      animation: thumbAnimation,
+      child: scrollThumbAndLabel,
+    );
+  }
+}
+
+class ScrollLabel extends StatelessWidget {
+  final Animation<double> animation;
+  final Color backgroundColor;
+  final Widget child;
+
+  const ScrollLabel({
+    Key key,
+    @required this.child,
+    @required this.animation,
+    @required this.backgroundColor,
+  }) : super(key: key);
+
+  @override
+  Widget build(BuildContext context) {
+    return FadeTransition(
+      opacity: animation,
+      child: Container(
+        margin: EdgeInsets.only(right: 12.0),
+        child: Material(
+          elevation: 4.0,
+          color: backgroundColor,
+          borderRadius: BorderRadius.all(Radius.circular(16.0)),
+          child: child,
+        ),
+      ),
+    );
+  }
+}
+
+class _DraggableScrollbarState extends State<DraggableScrollbar> with TickerProviderStateMixin {
+  final ValueNotifier<double> _thumbOffsetNotifier = ValueNotifier(0), _viewOffsetNotifier = ValueNotifier(0);
+  bool _isDragInProcess = false;
+
+  AnimationController _thumbAnimationController;
+  Animation<double> _thumbAnimation;
+  AnimationController _labelAnimationController;
+  Animation<double> _labelAnimation;
+  Timer _fadeoutTimer;
+
+  @override
+  void initState() {
+    super.initState();
+
+    _thumbAnimationController = AnimationController(
+      vsync: this,
+      duration: widget.scrollbarAnimationDuration,
+    );
+
+    _thumbAnimation = CurvedAnimation(
+      parent: _thumbAnimationController,
+      curve: Curves.fastOutSlowIn,
+    );
+
+    _labelAnimationController = AnimationController(
+      vsync: this,
+      duration: widget.scrollbarAnimationDuration,
+    );
+
+    _labelAnimation = CurvedAnimation(
+      parent: _labelAnimationController,
+      curve: Curves.fastOutSlowIn,
+    );
+  }
+
+  @override
+  void dispose() {
+    _thumbAnimationController.dispose();
+    _labelAnimationController.dispose();
+    _fadeoutTimer?.cancel();
+    super.dispose();
+  }
+
+  ScrollController get controller => widget.controller;
+
+  double get thumbMaxScrollExtent => context.size.height - widget.scrollThumbHeight - (widget.padding?.vertical ?? 0.0);
+
+  double get thumbMinScrollExtent => 0.0;
+
+  @override
+  Widget build(BuildContext context) {
+    return NotificationListener<ScrollNotification>(
+      onNotification: (notification) {
+        _onScrollNotification(notification);
+        return false;
+      },
+      child: Stack(
+        children: [
+          RepaintBoundary(
+            child: widget.child,
+          ),
+          RepaintBoundary(
+            child: GestureDetector(
+              onVerticalDragStart: _onVerticalDragStart,
+              onVerticalDragUpdate: _onVerticalDragUpdate,
+              onVerticalDragEnd: _onVerticalDragEnd,
+              child: ValueListenableBuilder(
+                valueListenable: _thumbOffsetNotifier,
+                builder: (context, thumbOffset, child) => Container(
+                  alignment: AlignmentDirectional.topEnd,
+                  padding: EdgeInsets.only(top: thumbOffset) + widget.padding,
+                  child: widget.scrollThumbBuilder(
+                    widget.backgroundColor,
+                    _thumbAnimation,
+                    _labelAnimation,
+                    widget.scrollThumbHeight,
+                    labelText: (widget.labelTextBuilder != null && _isDragInProcess)
+                        ? ValueListenableBuilder(
+                            valueListenable: _viewOffsetNotifier,
+                            builder: (context, viewOffset, child) => widget.labelTextBuilder(viewOffset + thumbOffset),
+                          )
+                        : null,
+                  ),
+                ),
+              ),
+            ),
+          ),
+        ],
+      ),
+    );
+  }
+
+  void _onScrollNotification(ScrollNotification notification) {
+    final scrollMetrics = notification.metrics;
+
+    // do not update the thumb if we cannot actually scroll
+    if (scrollMetrics.minScrollExtent >= scrollMetrics.maxScrollExtent) return;
+
+    _viewOffsetNotifier.value = scrollMetrics.pixels;
+
+    // we update the thumb position from the scrolled offset
+    // when the user is not dragging the thumb
+    if (!_isDragInProcess) {
+      if (notification is ScrollUpdateNotification) {
+        _thumbOffsetNotifier.value = (scrollMetrics.pixels / scrollMetrics.maxScrollExtent * thumbMaxScrollExtent).clamp(thumbMinScrollExtent, thumbMaxScrollExtent);
+      }
+
+      if (notification is ScrollUpdateNotification || notification is OverscrollNotification) {
+        _showThumb();
+        _scheduleFadeout();
+      }
+    }
+  }
+
+  void _onVerticalDragStart(DragStartDetails details) {
+    _labelAnimationController.forward();
+    _fadeoutTimer?.cancel();
+    setState(() => _isDragInProcess = true);
+  }
+
+  void _onVerticalDragUpdate(DragUpdateDetails details) {
+    _showThumb();
+    if (_isDragInProcess) {
+      // thumb offset
+      _thumbOffsetNotifier.value = (_thumbOffsetNotifier.value + details.delta.dy).clamp(thumbMinScrollExtent, thumbMaxScrollExtent);
+
+      // scroll offset
+      final min = controller.position.minScrollExtent;
+      final max = controller.position.maxScrollExtent;
+      controller.jumpTo((_thumbOffsetNotifier.value / thumbMaxScrollExtent * max).clamp(min, max));
+    }
+  }
+
+  void _onVerticalDragEnd(DragEndDetails details) {
+    _scheduleFadeout();
+    setState(() => _isDragInProcess = false);
+  }
+
+  void _showThumb() {
+    if (_thumbAnimationController.status != AnimationStatus.forward) {
+      _thumbAnimationController.forward();
+    }
+  }
+
+  void _scheduleFadeout() {
+    _fadeoutTimer?.cancel();
+    _fadeoutTimer = Timer(widget.scrollbarTimeToFade, () {
+      _thumbAnimationController.reverse();
+      _labelAnimationController.reverse();
+      _fadeoutTimer = null;
+    });
+  }
+}
+
+/// Draws 2 triangles like arrow up and arrow down
+class ArrowCustomPainter extends CustomPainter {
+  Color color;
+
+  ArrowCustomPainter(this.color);
+
+  @override
+  bool shouldRepaint(covariant CustomPainter oldDelegate) => false;
+
+  @override
+  void paint(Canvas canvas, Size size) {
+    final paint = Paint()..color = color;
+    const width = 12.0;
+    const height = 8.0;
+    final baseX = size.width / 2;
+    final baseY = size.height / 2;
+
+    canvas.drawPath(
+      _trianglePath(Offset(baseX, baseY - 2.0), width, height, true),
+      paint,
+    );
+    canvas.drawPath(
+      _trianglePath(Offset(baseX, baseY + 2.0), width, height, false),
+      paint,
+    );
+  }
+
+  static Path _trianglePath(Offset o, double width, double height, bool isUp) {
+    return Path()
+      ..moveTo(o.dx, o.dy)
+      ..lineTo(o.dx + width, o.dy)
+      ..lineTo(o.dx + (width / 2), isUp ? o.dy - height : o.dy + height)
+      ..close();
+  }
+}
+
+///This cut 2 lines in arrow shape
+class ArrowClipper extends CustomClipper<Path> {
+  @override
+  Path getClip(Size size) {
+    final path = Path();
+    path.lineTo(0.0, size.height);
+    path.lineTo(size.width, size.height);
+    path.lineTo(size.width, 0.0);
+    path.lineTo(0.0, 0.0);
+    path.close();
+
+    const arrowWidth = 8.0;
+    final startPointX = (size.width - arrowWidth) / 2;
+    var startPointY = size.height / 2 - arrowWidth / 2;
+    path.moveTo(startPointX, startPointY);
+    path.lineTo(startPointX + arrowWidth / 2, startPointY - arrowWidth / 2);
+    path.lineTo(startPointX + arrowWidth, startPointY);
+    path.lineTo(startPointX + arrowWidth, startPointY + 1.0);
+    path.lineTo(startPointX + arrowWidth / 2, startPointY - arrowWidth / 2 + 1.0);
+    path.lineTo(startPointX, startPointY + 1.0);
+    path.close();
+
+    startPointY = size.height / 2 + arrowWidth / 2;
+    path.moveTo(startPointX + arrowWidth, startPointY);
+    path.lineTo(startPointX + arrowWidth / 2, startPointY + arrowWidth / 2);
+    path.lineTo(startPointX, startPointY);
+    path.lineTo(startPointX, startPointY - 1.0);
+    path.lineTo(startPointX + arrowWidth / 2, startPointY + arrowWidth / 2 - 1.0);
+    path.lineTo(startPointX + arrowWidth, startPointY - 1.0);
+    path.close();
+
+    return path;
+  }
+
+  @override
+  bool shouldReclip(CustomClipper<Path> oldClipper) => false;
+}
+
+class SlideFadeTransition extends StatelessWidget {
+  final Animation<double> animation;
+  final Widget child;
+
+  const SlideFadeTransition({
+    Key key,
+    @required this.animation,
+    @required this.child,
+  }) : super(key: key);
+
+  @override
+  Widget build(BuildContext context) {
+    return AnimatedBuilder(
+      animation: animation,
+      builder: (context, child) => animation.value == 0.0 ? Container() : child,
+      child: SlideTransition(
+        position: Tween(
+          begin: Offset(0.3, 0.0),
+          end: Offset(0.0, 0.0),
+        ).animate(animation),
+        child: FadeTransition(
+          opacity: animation,
+          child: child,
+        ),
+      ),
+    );
+  }
+}

lib/widgets/common/basic/insets.dart

@@ -0,0 +1,62 @@
+import 'package:aves/widgets/common/extensions/media_query.dart';
+import 'package:flutter/material.dart';
+import 'package:provider/provider.dart';
+
+// This widget should be added on top of Scaffolds with:
+// - `resizeToAvoidBottomInset` set to false,
+// - a vertically scrollable body.
+// It will prevent the body from scrolling when a user swipe from bottom to use Android Q style navigation gestures.
+class BottomGestureAreaProtector extends StatelessWidget {
+  // as of Flutter v1.22.5, `systemGestureInsets` from `MediaQuery` mistakenly reports no bottom inset,
+  // so we use an empirical measurement instead
+  static const double systemGestureInsetsBottom = 32;
+
+  @override
+  Widget build(BuildContext context) {
+    return Selector<MediaQueryData, double>(
+      selector: (c, mq) => mq.effectiveBottomPadding,
+      builder: (c, mqPaddingBottom, child) {
+        // devices with physical navigation buttons have no bottom insets
+        // we assume these devices do not use gesture navigation
+        if (mqPaddingBottom == 0) return SizedBox();
+        return Positioned(
+          left: 0,
+          right: 0,
+          bottom: 0,
+          height: systemGestureInsetsBottom,
+          child: AbsorbPointer(),
+        );
+      },
+    );
+  }
+}
+
+class GestureAreaProtectorStack extends StatelessWidget {
+  final Widget child;
+
+  const GestureAreaProtectorStack({@required this.child});
+
+  @override
+  Widget build(BuildContext context) {
+    return Stack(
+      children: [
+        child,
+        BottomGestureAreaProtector(),
+      ],
+    );
+  }
+}
+
+class BottomPaddingSliver extends StatelessWidget {
+  @override
+  Widget build(BuildContext context) {
+    return SliverToBoxAdapter(
+      child: Selector<MediaQueryData, double>(
+        selector: (context, mq) => mq.effectiveBottomPadding,
+        builder: (context, mqPaddingBottom, child) {
+          return SizedBox(height: mqPaddingBottom);
+        },
+      ),
+    );
+  }
+}

lib/widgets/common/basic/link_chip.dart

@@ -44,7 +44,7 @@ class LinkChip extends StatelessWidget {
               SizedBox(width: 8),
               Builder(
                 builder: (context) => Icon(
-                  AIcons.openInNew,
+                  AIcons.openOutside,
                   size: DefaultTextStyle.of(context).style.fontSize,
                   color: color,
                 ),

lib/widgets/common/behaviour/routes.dart

@@ -1,9 +1,5 @@
 import 'package:flutter/material.dart';
 
-extension ExtraContext on BuildContext {
-  String get currentRouteName => ModalRoute.of(this)?.settings?.name;
-}
-
 class DirectMaterialPageRoute<T> extends PageRouteBuilder<T> {
   DirectMaterialPageRoute({
     RouteSettings settings,