Switch tracks by swipe on cover

app/src/main/java/org/oxycblt/auxio/image/CoverView.kt

@@ -73,7 +73,7 @@ import org.oxycblt.auxio.util.getInteger
  * @author Alexander Capehart (OxygenCobalt)
  */
 @AndroidEntryPoint
-class CoverView
+open class CoverView
 @JvmOverloads
 constructor(context: Context, attrs: AttributeSet? = null, @AttrRes defStyleAttr: Int = 0) :
     FrameLayout(context, attrs, defStyleAttr) {

app/src/main/java/org/oxycblt/auxio/playback/PlaybackPanelFragment.kt

@@ -39,6 +39,7 @@ import org.oxycblt.auxio.music.Song
 import org.oxycblt.auxio.music.resolveNames
 import org.oxycblt.auxio.playback.state.RepeatMode
 import org.oxycblt.auxio.playback.ui.StyledSeekBar
+import org.oxycblt.auxio.playback.ui.SwipeCoverView
 import org.oxycblt.auxio.ui.ViewBindingFragment
 import org.oxycblt.auxio.util.collectImmediately
 import org.oxycblt.auxio.util.logD
@@ -58,7 +59,8 @@ import org.oxycblt.auxio.util.systemBarInsetsCompat
 class PlaybackPanelFragment :
     ViewBindingFragment<FragmentPlaybackPanelBinding>(),
     Toolbar.OnMenuItemClickListener,
-    StyledSeekBar.Listener {
+    StyledSeekBar.Listener,
+    SwipeCoverView.OnSwipeListener {
     private val playbackModel: PlaybackViewModel by activityViewModels()
     private val musicModel: MusicViewModel by activityViewModels()
     private val detailModel: DetailViewModel by activityViewModels()
@@ -111,7 +113,7 @@ class PlaybackPanelFragment :
             isSelected = true
             setOnClickListener { navigateToCurrentAlbum() }
         }
-
+        binding.playbackCover.onSwipeListener = this
         binding.playbackSeekBar.listener = this
 
         // Set up actions
@@ -191,6 +193,14 @@ class PlaybackPanelFragment :
         playbackModel.seekTo(positionDs)
     }
 
+    override fun onSwipePrevious() {
+        playbackModel.prev()
+    }
+
+    override fun onSwipeNext() {
+        playbackModel.next()
+    }
+
     private fun updateSong(song: Song?) {
         if (song == null) {
             // Nothing to do.

app/src/main/java/org/oxycblt/auxio/playback/ui/SwipeCoverView.kt

@@ -0,0 +1,107 @@
+/*
+ * Copyright (c) 2023 Auxio Project
+ * SwipeCoverView.kt is part of Auxio.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package org.oxycblt.auxio.playback.ui
+
+import android.annotation.SuppressLint
+import android.content.Context
+import android.util.AttributeSet
+import android.view.GestureDetector
+import android.view.GestureDetector.OnGestureListener
+import android.view.MotionEvent
+import android.view.ViewConfiguration
+import androidx.annotation.AttrRes
+import kotlin.math.abs
+import org.oxycblt.auxio.image.CoverView
+import org.oxycblt.auxio.util.isRtl
+
+class SwipeCoverView
+@JvmOverloads
+constructor(context: Context, attrs: AttributeSet? = null, @AttrRes defStyleAttr: Int = 0) :
+    CoverView(context, attrs, defStyleAttr), OnGestureListener {
+
+    private val gestureDetector = GestureDetector(context, this)
+    private val viewConfig = ViewConfiguration.get(context)
+
+    var onSwipeListener: OnSwipeListener? = null
+
+    override fun onInterceptTouchEvent(event: MotionEvent): Boolean {
+        return gestureDetector.onTouchEvent(event)
+    }
+
+    @SuppressLint("ClickableViewAccessibility")
+    override fun onTouchEvent(event: MotionEvent): Boolean {
+        return gestureDetector.onTouchEvent(event) || super.onTouchEvent(event)
+    }
+
+    override fun onGenericMotionEvent(event: MotionEvent): Boolean {
+        return gestureDetector.onGenericMotionEvent(event) || super.onGenericMotionEvent(event)
+    }
+
+    override fun onDown(e: MotionEvent): Boolean = true
+
+    override fun onShowPress(e: MotionEvent) = Unit
+
+    override fun onSingleTapUp(e: MotionEvent): Boolean = false
+
+    override fun onScroll(
+        e1: MotionEvent?,
+        e2: MotionEvent,
+        velocityX: Float,
+        velocityY: Float
+    ): Boolean = false
+
+    override fun onFling(
+        e1: MotionEvent?,
+        e2: MotionEvent,
+        velocityX: Float,
+        velocityY: Float
+    ): Boolean {
+        e1 ?: return false
+        val diffY = e2.y - e1.y
+        val diffX = e2.x - e1.x
+        if (abs(diffX) > abs(diffY) &&
+            abs(diffX) > viewConfig.scaledTouchSlop &&
+            abs(velocityX) > viewConfig.scaledMinimumFlingVelocity
+        ) {
+            if (diffX > 0) {
+                onSwipeRight()
+            } else {
+                onSwipeLeft()
+            }
+            return true
+        }
+        return false
+    }
+
+    override fun onLongPress(e: MotionEvent) = Unit
+
+    private fun onSwipeRight() {
+        onSwipeListener?.run { if (isRtl) onSwipeNext() else onSwipePrevious() }
+    }
+
+    private fun onSwipeLeft() {
+        onSwipeListener?.run { if (isRtl) onSwipePrevious() else onSwipeNext() }
+    }
+
+    interface OnSwipeListener {
+
+        fun onSwipePrevious()
+        fun onSwipeNext()
+    }
+}

app/src/main/res/layout-h480dp/fragment_playback_panel.xml

@@ -16,7 +16,7 @@
         app:title="@string/lbl_playback"
         tools:subtitle="@string/lbl_all_songs" />
 
-    <org.oxycblt.auxio.image.CoverView
+    <org.oxycblt.auxio.playback.ui.SwipeCoverView
         android:id="@+id/playback_cover"
         style="@style/Widget.Auxio.Image.Full"
         android:layout_margin="@dimen/spacing_medium"

app/src/main/res/layout-sw600dp/fragment_playback_panel.xml

@@ -16,7 +16,7 @@
         app:title="@string/lbl_playback"
         tools:subtitle="@string/lbl_all_songs" />
 
-    <org.oxycblt.auxio.image.CoverView
+    <org.oxycblt.auxio.playback.ui.SwipeCoverView
         android:id="@+id/playback_cover"
         style="@style/Widget.Auxio.Image.Full"
         android:layout_margin="@dimen/spacing_medium"

app/src/main/res/layout/fragment_playback_panel.xml

@@ -16,7 +16,7 @@
         app:title="@string/lbl_playback"
         tools:subtitle="@string/lbl_all_songs" />
 
-    <org.oxycblt.auxio.image.CoverView
+    <org.oxycblt.auxio.playback.ui.SwipeCoverView
         android:id="@+id/playback_cover"
         style="@style/Widget.Auxio.Image.Full"
         android:layout_marginStart="@dimen/spacing_medium"