detail: update playlist header to reflect edits

Make the header information reflect changes in playlist composition as
the playlist is edited.

This should improve the editing experience to some extent.

app/src/main/java/org/oxycblt/auxio/detail/PlaylistDetailFragment.kt

@@ -282,12 +282,11 @@ class PlaylistDetailFragment :
         // TODO: Disable check item when no edits have been made
 
         // TODO: Massively improve how this UI is indicated:
-        //  - Make playlist header dynamically respond to song changes
-        //  - Disable play and pause buttons
         //  - Add an additional toolbar to indicate editing
         //  - Header should flip to re-sort button eventually
 
         playlistListAdapter.setEditing(editedPlaylist != null)
+        playlistHeaderAdapter.setEditedPlaylist(editedPlaylist)
     }
 
     private fun updateSelection(selected: List<Music>) {

app/src/main/java/org/oxycblt/auxio/detail/header/DetailHeaderAdapter.kt

@@ -48,6 +48,13 @@ abstract class DetailHeaderAdapter<T : MusicParent, VH : RecyclerView.ViewHolder
      */
     fun setParent(parent: T) {
         currentParent = parent
+        rebindParent()
+    }
+
+    /**
+     * Forces the parent [RecyclerView.ViewHolder] to rebind as soon as possible, with no animation.
+     */
+    protected fun rebindParent() {
         notifyItemChanged(0, PAYLOAD_UPDATE_HEADER)
     }
 

app/src/main/java/org/oxycblt/auxio/detail/header/PlaylistDetailHeaderAdapter.kt

@@ -25,6 +25,7 @@ import androidx.recyclerview.widget.RecyclerView
 import org.oxycblt.auxio.R
 import org.oxycblt.auxio.databinding.ItemDetailHeaderBinding
 import org.oxycblt.auxio.music.Playlist
+import org.oxycblt.auxio.music.Song
 import org.oxycblt.auxio.playback.formatDurationMs
 import org.oxycblt.auxio.util.context
 import org.oxycblt.auxio.util.getPlural
@@ -38,11 +39,27 @@ import org.oxycblt.auxio.util.inflater
  */
 class PlaylistDetailHeaderAdapter(private val listener: Listener) :
     DetailHeaderAdapter<Playlist, PlaylistDetailHeaderViewHolder>() {
+    private var editedPlaylist: List<Song>? = null
+
     override fun onCreateViewHolder(parent: ViewGroup, viewType: Int) =
         PlaylistDetailHeaderViewHolder.from(parent)
 
     override fun onBindHeader(holder: PlaylistDetailHeaderViewHolder, parent: Playlist) =
-        holder.bind(parent, listener)
+        holder.bind(parent, editedPlaylist, listener)
+
+    /**
+     * Indicate to this adapter that editing is ongoing with the current state of the editing
+     * process. This will make the header immediately update to reflect information about the edited
+     * playlist.
+     */
+    fun setEditedPlaylist(songs: List<Song>?) {
+        if (editedPlaylist == songs) {
+            // Nothing to do.
+            return
+        }
+        editedPlaylist = songs
+        rebindParent()
+    }
 }
 
 /**
@@ -58,35 +75,39 @@ private constructor(private val binding: ItemDetailHeaderBinding) :
      * Bind new data to this instance.
      *
      * @param playlist The new [Playlist] to bind.
+     * @param editedPlaylist The current edited state of the playlist, if it exists.
      * @param listener A [DetailHeaderAdapter.Listener] to bind interactions to.
      */
-    fun bind(playlist: Playlist, listener: DetailHeaderAdapter.Listener) {
-        binding.detailCover.bind(playlist)
+    fun bind(
+        playlist: Playlist,
+        editedPlaylist: List<Song>?,
+        listener: DetailHeaderAdapter.Listener
+    ) {
+        binding.detailCover.bind(playlist, editedPlaylist)
         binding.detailType.text = binding.context.getString(R.string.lbl_playlist)
         binding.detailName.text = playlist.name.resolve(binding.context)
         // Nothing about a playlist is applicable to the sub-head text.
         binding.detailSubhead.isVisible = false
 
+        val songs = editedPlaylist ?: playlist.songs
+        val durationMs = editedPlaylist?.sumOf { it.durationMs } ?: playlist.durationMs
         // The song count of the playlist maps to the info text.
-        binding.detailInfo.apply {
-            isVisible = true
-            text =
-                if (playlist.songs.isNotEmpty()) {
+        binding.detailInfo.text =
+            if (songs.isNotEmpty()) {
                 binding.context.getString(
                     R.string.fmt_two,
-                        binding.context.getPlural(R.plurals.fmt_song_count, playlist.songs.size),
-                        playlist.durationMs.formatDurationMs(true))
+                    binding.context.getPlural(R.plurals.fmt_song_count, songs.size),
+                    durationMs.formatDurationMs(true))
             } else {
                 binding.context.getString(R.string.def_song_count)
             }
-        }
 
         binding.detailPlayButton.apply {
-            isEnabled = playlist.songs.isNotEmpty()
+            isEnabled = playlist.songs.isNotEmpty() && editedPlaylist == null
             setOnClickListener { listener.onPlay() }
         }
         binding.detailShuffleButton.apply {
-            isEnabled = playlist.songs.isNotEmpty()
+            isEnabled = playlist.songs.isNotEmpty() && editedPlaylist == null
             setOnClickListener { listener.onShuffle() }
         }
     }

app/src/main/java/org/oxycblt/auxio/detail/list/PlaylistDetailListAdapter.kt

@@ -278,10 +278,7 @@ private constructor(private val binding: ItemEditableSongBinding) :
     override fun updateEditing(editing: Boolean) {
         binding.songDragHandle.isInvisible = !editing
         binding.songMenu.isInvisible = editing
-        binding.interactBody.apply {
-            isClickable = !editing
-            isFocusable = !editing
-        }
+        binding.interactBody.isEnabled = !editing
     }
 
     companion object {

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

@@ -103,42 +103,47 @@ constructor(context: Context, attrs: AttributeSet? = null, @AttrRes defStyleAttr
      *
      * @param album the [Album] to bind.
      */
-    fun bind(album: Album) = bindImpl(album, R.drawable.ic_album_24, R.string.desc_album_cover)
+    fun bind(album: Album) = bind(album, R.drawable.ic_album_24, R.string.desc_album_cover)
 
     /**
      * Bind an [Artist]'s image to this view, also updating the content description.
      *
      * @param artist the [Artist] to bind.
      */
-    fun bind(artist: Artist) = bindImpl(artist, R.drawable.ic_artist_24, R.string.desc_artist_image)
+    fun bind(artist: Artist) = bind(artist, R.drawable.ic_artist_24, R.string.desc_artist_image)
 
     /**
      * Bind an [Genre]'s image to this view, also updating the content description.
      *
      * @param genre the [Genre] to bind.
      */
-    fun bind(genre: Genre) = bindImpl(genre, R.drawable.ic_genre_24, R.string.desc_genre_image)
+    fun bind(genre: Genre) = bind(genre, R.drawable.ic_genre_24, R.string.desc_genre_image)
 
     /**
      * Bind a [Playlist]'s image to this view, also updating the content description.
      *
-     * @param playlist the [Playlist] to bind.
+     * @param playlist The [Playlist] to bind.
+     * @param songs [Song]s that can override the playlist image if it needs to differ for any
+     *   reason.
      */
-    fun bind(playlist: Playlist) =
-        bindImpl(playlist, R.drawable.ic_playlist_24, R.string.desc_playlist_image)
+    fun bind(playlist: Playlist, songs: List<Song>? = null) =
+        if (songs != null) {
+            bind(
+                songs,
+                context.getString(R.string.desc_playlist_image, playlist.name.resolve(context)),
+                R.drawable.ic_playlist_24)
+        } else {
+            bind(playlist, R.drawable.ic_playlist_24, R.string.desc_playlist_image)
+        }
 
-    /**
-     * Internally bind a [Music]'s image to this view.
-     *
-     * @param parent The music to bind, in the form of it's [MusicParent]s.
-     * @param errorRes The error drawable resource to use if the music cannot be loaded.
-     * @param descRes The content description string resource to use. The resource must have one
-     *   field for the name of the [Music].
-     */
-    private fun bindImpl(parent: MusicParent, @DrawableRes errorRes: Int, @StringRes descRes: Int) {
+    private fun bind(parent: MusicParent, @DrawableRes errorRes: Int, @StringRes descRes: Int) {
+        bind(parent.songs, context.getString(descRes, parent.name.resolve(context)), errorRes)
+    }
+
+    private fun bind(songs: List<Song>, desc: String, @DrawableRes errorRes: Int) {
         val request =
             ImageRequest.Builder(context)
-                .data(parent.songs)
+                .data(songs)
                 .error(StyledDrawable(context, context.getDrawableCompat(errorRes)))
                 .transformations(SquareFrameTransform.INSTANCE)
                 .target(this)
@@ -146,8 +151,7 @@ constructor(context: Context, attrs: AttributeSet? = null, @AttrRes defStyleAttr
         // Dispose of any previous image request and load a new image.
         CoilUtils.dispose(this)
         imageLoader.enqueue(request)
-        // Update the content description to the specified resource.
-        contentDescription = context.getString(descRes, parent.name.resolve(context))
+        contentDescription = desc
     }
 
     /**

app/src/main/res/drawable/ic_edit_24.xml

@@ -7,5 +7,5 @@
     android:tint="?attr/colorControlNormal">
   <path
       android:fillColor="@android:color/white"
-      android:pathData="M200,760L256,760L601,415L545,359L200,704L200,760ZM772,357L602,189L658,133Q681,110 714.5,110Q748,110 771,133L827,189Q850,212 851,244.5Q852,277 829,300L772,357ZM714,416L290,840L120,840L120,670L544,246L714,416ZM573,387L545,359L545,359L601,415L601,415L573,387Z"/>
+      android:pathData="M200,760L256,760L601,415L545,359L200,704L200,760ZM772,357L602,189L715,76L884,245L772,357ZM120,840L120,670L544,246L714,416L290,840L120,840ZM573,387L545,359L545,359L601,415L601,415L573,387Z"/>
 </vector>