Add library sort mode preference

Save the library sort mode to a SharedPreferences object, soon to be extended with other prefs.

app/src/main/java/org/oxycblt/auxio/MainActivity.kt

@@ -5,8 +5,8 @@ import android.content.Intent
 import android.util.AttributeSet
 import android.view.View
 import androidx.appcompat.app.AppCompatActivity
-import androidx.appcompat.app.AppCompatDelegate
 import org.oxycblt.auxio.playback.PlaybackService
+import org.oxycblt.auxio.prefs.PrefsManager
 import org.oxycblt.auxio.ui.accent
 
 // FIXME: Fix bug where fast navigation will break the animations and
@@ -16,7 +16,8 @@ import org.oxycblt.auxio.ui.accent
 class MainActivity : AppCompatActivity(R.layout.activity_main) {
 
     override fun onCreateView(name: String, context: Context, attrs: AttributeSet): View? {
-        AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_YES)
+        val prefsManager = PrefsManager.init(this)
+
         // Apply the theme
         setTheme(accent.second)
 

app/src/main/java/org/oxycblt/auxio/library/LibraryViewModel.kt

@@ -6,11 +6,14 @@ import androidx.lifecycle.LiveData
 import androidx.lifecycle.MutableLiveData
 import androidx.lifecycle.ViewModel
 import androidx.lifecycle.viewModelScope
+import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.launch
+import kotlinx.coroutines.withContext
 import org.oxycblt.auxio.R
 import org.oxycblt.auxio.music.BaseModel
 import org.oxycblt.auxio.music.Header
 import org.oxycblt.auxio.music.MusicStore
+import org.oxycblt.auxio.prefs.PrefsManager
 import org.oxycblt.auxio.recycler.ShowMode
 import org.oxycblt.auxio.recycler.SortMode
 
@@ -36,6 +39,16 @@ class LibraryViewModel : ViewModel() {
     private var mSearchHasFocus = false
     val searchHasFocus: Boolean get() = mSearchHasFocus
 
+    init {
+        val prefsManager = PrefsManager.getInstance()
+
+        viewModelScope.launch {
+            mSortMode.value = withContext(Dispatchers.IO) {
+                prefsManager.getLibrarySortMode()
+            }
+        }
+    }
+
     /**
      * Perform a search of the music library, given a query.
      * Results are pushed to [searchResults].
@@ -119,6 +132,14 @@ class LibraryViewModel : ViewModel() {
 
         if (mode != mSortMode.value) {
             mSortMode.value = mode
+
+            viewModelScope.launch {
+                withContext(Dispatchers.IO) {
+                    val prefsManager = PrefsManager.getInstance()
+
+                    prefsManager.setLibrarySortMode(mSortMode.value!!)
+                }
+            }
         }
     }
 }

app/src/main/java/org/oxycblt/auxio/playback/state/PlaybackStateManager.kt

@@ -271,6 +271,7 @@ class PlaybackStateManager private constructor() {
 
     /**
      * Go to the previous song, doing any checks that are needed.
+     * TODO: Implement option to rewind before skipping back
      */
     fun prev() {
         if (mIndex > 0 && !mIsInUserQueue) {

app/src/main/java/org/oxycblt/auxio/prefs/PrefsManager.kt

@@ -0,0 +1,71 @@
+package org.oxycblt.auxio.prefs
+
+import android.content.Context
+import android.content.SharedPreferences
+import org.oxycblt.auxio.recycler.SortMode
+
+/**
+ * Wrapper around the [SharedPreferences] class that writes & reads values.
+ * Please run any getter/setter in a coroutine. Its not required, but it prevents slowdowns
+ * on older devices.
+ * @author OxygenCobalt
+ */
+class PrefsManager private constructor(context: Context) {
+    private val sharedPrefs = context.getSharedPreferences(
+        "auxio_prefs", Context.MODE_PRIVATE
+    )
+
+    private lateinit var mLibrarySortMode: SortMode
+
+    fun setLibrarySortMode(sortMode: SortMode) {
+        mLibrarySortMode = sortMode
+
+        sharedPrefs.edit()
+            .putInt(Keys.KEY_LIBRARY_SORT_MODE, sortMode.toConstant())
+            .apply()
+    }
+
+    fun getLibrarySortMode(): SortMode {
+        if (!::mLibrarySortMode.isInitialized) {
+            mLibrarySortMode = SortMode.fromConstant(
+                sharedPrefs.getInt(
+                    Keys.KEY_LIBRARY_SORT_MODE,
+                    SortMode.CONSTANT_ALPHA_DOWN
+                )
+            ) ?: SortMode.ALPHA_DOWN
+        }
+
+        return mLibrarySortMode
+    }
+
+    companion object {
+        @Volatile
+        private lateinit var INSTANCE: PrefsManager
+
+        /**
+         * Init the single instance of [PrefsManager]. Done so that every object
+         * can have access to it regardless of if it has a context.
+         */
+        fun init(context: Context): PrefsManager {
+            synchronized(this) {
+                INSTANCE = PrefsManager(context)
+
+                return getInstance()
+            }
+        }
+
+        /**
+         * Get the single instance of [PrefsManager].
+         */
+        fun getInstance(): PrefsManager {
+            check(::INSTANCE.isInitialized) {
+                "PrefsManager must be initialized with init() before getting its instance."
+            }
+            return INSTANCE
+        }
+    }
+
+    object Keys {
+        const val KEY_LIBRARY_SORT_MODE = "KEY_LIBRARY_SORT_MODE"
+    }
+}

app/src/main/java/org/oxycblt/auxio/recycler/NoLeakThumbView.kt

@@ -36,11 +36,7 @@ class NoLeakThumbView @JvmOverloads constructor(
     context: Context,
     attrs: AttributeSet? = null,
     defStyleAttr: Int = R.attr.indicatorFastScrollerThumbStyle
-) : ConstraintLayout(
+) : ConstraintLayout(context, attrs, defStyleAttr),
-    context,
-    attrs,
-    defStyleAttr
-),
     FastScrollerView.ItemIndicatorSelectedCallback {
 
     private var thumbColor = ColorStateList.valueOf(accent.first.toColor(context))
@@ -98,7 +94,7 @@ class NoLeakThumbView @JvmOverloads constructor(
 
     /**
      * Hack so that I can detect when the pointer is off the FastScrollerView's items
-     * without using onItemIndicatorTouched [Which is internal]
+     * without using onItemIndicatorTouched (Which is internal)
      * @author OxygenCobalt
      */
     private fun isPointerOnItem(fastScrollerView: FastScrollerView, touchY: Int): Boolean {

app/src/main/java/org/oxycblt/auxio/recycler/SortMode.kt

@@ -94,4 +94,34 @@ enum class SortMode(val iconRes: Int) {
             else -> R.id.option_sort_none
         }
     }
+
+    fun toConstant(): Int {
+        return when (this) {
+            NONE -> CONSTANT_NONE
+            ALPHA_UP -> CONSTANT_ALPHA_UP
+            ALPHA_DOWN -> CONSTANT_ALPHA_DOWN
+            NUMERIC_UP -> CONSTANT_NUMERIC_UP
+            NUMERIC_DOWN -> CONSTANT_NUMERIC_DOWN
+        }
+    }
+
+    companion object {
+        const val CONSTANT_NONE = 0xA060
+        const val CONSTANT_ALPHA_UP = 0xA061
+        const val CONSTANT_ALPHA_DOWN = 0xA062
+        const val CONSTANT_NUMERIC_UP = 0xA063
+        const val CONSTANT_NUMERIC_DOWN = 0xA065
+
+        fun fromConstant(constant: Int): SortMode? {
+            return when (constant) {
+                CONSTANT_NONE -> NONE
+                CONSTANT_ALPHA_UP -> ALPHA_UP
+                CONSTANT_ALPHA_DOWN -> ALPHA_DOWN
+                CONSTANT_NUMERIC_UP -> NUMERIC_UP
+                CONSTANT_NUMERIC_DOWN -> NUMERIC_DOWN
+
+                else -> null
+            }
+        }
+    }
 }