multipage: faster default page

lib/model/entry.dart

@@ -98,21 +98,26 @@ class AvesEntry {
 
   AvesEntry getPageEntry(SinglePageInfo pageInfo) {
     if (pageInfo == null) return this;
-    return AvesPageEntry(
-      pageInfo: pageInfo,
+
+    // 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 = pageInfo.isDefault ? null : pageInfo.pageId;
+
+    return AvesEntry(
       uri: uri,
       path: path,
       contentId: contentId,
-      pageId: pageInfo.pageId,
-      sourceMimeType: sourceMimeType,
-      width: width,
-      height: height,
+      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: durationMillis,
+      durationMillis: pageInfo.durationMillis ?? durationMillis,
     )
       ..catalogMetadata = _catalogMetadata?.copyWith(
         mimeType: pageInfo.mimeType,

lib/model/entry_images.dart

@@ -9,7 +9,9 @@ import 'package:flutter/foundation.dart';
 import 'package:flutter/widgets.dart';
 
 extension ExtraAvesEntry on AvesEntry {
-  ThumbnailProvider getThumbnail({double extent = 0}) => ThumbnailProvider(_getThumbnailProviderKey(extent));
+  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
@@ -28,9 +30,11 @@ extension ExtraAvesEntry on AvesEntry {
     );
   }
 
-  RegionProvider getRegion({@required int sampleSize, Rectangle<int> region}) => RegionProvider(getRegionProviderKey(sampleSize, region));
+  RegionProvider getRegion({@required int sampleSize, Rectangle<int> region}) {
+    return RegionProvider(_getRegionProviderKey(sampleSize, region));
+  }
 
-  RegionProviderKey getRegionProviderKey(int sampleSize, Rectangle<int> region) {
+  RegionProviderKey _getRegionProviderKey(int sampleSize, Rectangle<int> region) {
     return RegionProviderKey(
       uri: uri,
       mimeType: mimeType,

lib/model/multipage.dart

@@ -1,4 +1,3 @@
-import 'package:aves/model/entry.dart';
 import 'package:flutter/foundation.dart';
 
 class MultiPageInfo {
@@ -8,12 +7,23 @@ class MultiPageInfo {
 
   MultiPageInfo({
     this.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);
@@ -22,13 +32,13 @@ class MultiPageInfo {
   String toString() => '$runtimeType#${shortHash(this)}{pages=$pages}';
 }
 
-class SinglePageInfo {
+class SinglePageInfo implements Comparable<SinglePageInfo> {
   final int index, pageId;
   final String mimeType;
   final bool isDefault;
   final int width, height, durationMillis;
 
-  SinglePageInfo({
+  const SinglePageInfo({
     this.index,
     this.pageId,
     this.mimeType,
@@ -38,6 +48,20 @@ class SinglePageInfo {
     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(
@@ -53,39 +77,7 @@ class SinglePageInfo {
 
   @override
   String toString() => '$runtimeType#${shortHash(this)}{index=$index, pageId=$pageId, mimeType=$mimeType, isDefault=$isDefault, width=$width, height=$height, durationMillis=$durationMillis}';
-}
 
-class AvesPageEntry extends AvesEntry {
-  final SinglePageInfo pageInfo;
-
-  AvesPageEntry({
-    @required this.pageInfo,
-    String uri,
-    String path,
-    int contentId,
-    int pageId,
-    String sourceMimeType,
-    int width,
-    int height,
-    int sourceRotationDegrees,
-    int sizeBytes,
-    String sourceTitle,
-    int dateModifiedSecs,
-    int sourceDateTakenMillis,
-    int durationMillis,
-  }) : super(
-          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,
-        );
+  @override
+  int compareTo(SinglePageInfo other) => index.compareTo(other.index);
 }

lib/widgets/viewer/multipage.dart

@@ -12,8 +12,7 @@ class MultiPageController extends ChangeNotifier {
 
   MultiPageController(AvesEntry entry) {
     info = MetadataService.getMultiPageInfo(entry).then((value) {
-      final defaultPage = value.pages.firstWhere((page) => page.isDefault, orElse: () => null);
-        pageNotifier.value = defaultPage?.index ?? 0;
+      pageNotifier.value = value.defaultPage.index;
       return value;
     });
   }

lib/widgets/viewer/overlay/bottom.dart

@@ -363,7 +363,7 @@ class _PositionTitleRow extends StatelessWidget {
           // but fail to get information about these pages
           final pageCount = multiPageInfo.pageCount;
           if (pageCount > 0) {
-            final page = multiPageInfo.getById(entry.pageId);
+            final page = multiPageInfo.getById(entry.pageId) ?? multiPageInfo.defaultPage;
             pagePosition = '${(page?.index ?? 0) + 1}/$pageCount';
           }
         }