Dragging and dropping items

app/src/main/java/com/github/libretube/extensions/Move.kt

@@ -0,0 +1,7 @@
+package com.github.libretube.extensions
+
+fun <T> MutableList<T>.move(oldPosition: Int, newPosition: Int) {
+    val item = this.get(oldPosition)
+    this.removeAt(oldPosition)
+    this.add(newPosition, item)
+}

app/src/main/java/com/github/libretube/ui/adapters/PlayingQueueAdapter.kt

@@ -8,8 +8,9 @@ import com.github.libretube.databinding.QueueRowBinding
 import com.github.libretube.ui.viewholders.PlayingQueueViewHolder
 import com.github.libretube.util.ImageHelper
 import com.github.libretube.util.PlayingQueue
+import com.github.libretube.util.ThemeHelper
 
-class PlayingQueueAdapter() : RecyclerView.Adapter<PlayingQueueViewHolder>() {
+class PlayingQueueAdapter : RecyclerView.Adapter<PlayingQueueViewHolder>() {
     override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): PlayingQueueViewHolder {
         val binding = QueueRowBinding.inflate(
             LayoutInflater.from(parent.context),
@@ -32,6 +33,11 @@ class PlayingQueueAdapter() : RecyclerView.Adapter<PlayingQueueViewHolder>() {
             duration.text = streamItem.duration?.let {
                 DateUtils.formatElapsedTime(it)
             }
+            if (PlayingQueue.currentIndex() == position) {
+                root.setBackgroundColor(
+                    ThemeHelper.getThemeColor(root.context, android.R.attr.colorControlHighlight)
+                )
+            }
         }
     }
 }

app/src/main/java/com/github/libretube/ui/sheets/PlayingQueueSheet.kt

@@ -35,12 +35,25 @@ class PlayingQueueSheet : BottomSheetDialogFragment() {
             0,
             ItemTouchHelper.LEFT
         ) {
+            override fun getMovementFlags(
+                recyclerView: RecyclerView,
+                viewHolder: RecyclerView.ViewHolder
+            ): Int {
+                val dragFlags = ItemTouchHelper.UP or ItemTouchHelper.DOWN
+                return makeMovementFlags(dragFlags, 0)
+            }
+
             override fun onMove(
                 recyclerView: RecyclerView,
                 viewHolder: RecyclerView.ViewHolder,
                 target: RecyclerView.ViewHolder
             ): Boolean {
-                TODO("Not yet implemented")
+                val from = viewHolder.absoluteAdapterPosition
+                val to = target.absoluteAdapterPosition
+
+                adapter.notifyItemMoved(from, to)
+                PlayingQueue.move(from, to)
+                return true
             }
 
             override fun onSwiped(viewHolder: RecyclerView.ViewHolder, direction: Int) {

app/src/main/java/com/github/libretube/util/PlayingQueue.kt

@@ -2,6 +2,7 @@ package com.github.libretube.util
 
 import com.github.libretube.api.RetrofitInstance
 import com.github.libretube.api.obj.StreamItem
+import com.github.libretube.extensions.move
 import com.github.libretube.extensions.toID
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
@@ -67,6 +68,8 @@ object PlayingQueue {
 
     fun remove(index: Int) = queue.removeAt(index)
 
+    fun move(from: Int, to: Int) = queue.move(from, to)
+
     private fun fetchMoreFromPlaylist(playlistId: String, nextPage: String?) {
         var playlistNextPage: String? = nextPage
         CoroutineScope(Dispatchers.IO).launch {