make goto next or prev streem buttons work

new-player/src/main/java/net/newpipe/newplayer/NewPlayer.kt

@@ -79,6 +79,7 @@ interface NewPlayer {
 
     val playlist: StateFlow<List<PlaylistItem>>
     val currentlyPlaying: StateFlow<PlaylistItem?>
+    var currentlyPlayingPlaylistItem: Int
 
     val currentChapters: StateFlow<List<Chapter>>
 
@@ -96,7 +97,6 @@ interface NewPlayer {
     fun removePlaylistItem(index: Int)
     fun playStream(item: String, playMode: PlayMode)
     fun selectChapter(index: Int)
-    fun selectPlaylistItem(index: Int)
     fun playStream(item: String, streamVariant: String, playMode: PlayMode)
 
     data class Builder(val app: Application, val repository: MediaRepository) {
@@ -209,6 +209,15 @@ class NewPlayerImpl(
     private val mutableCurrentChapter = MutableStateFlow<List<Chapter>>(emptyList())
     override val currentChapters: StateFlow<List<Chapter>> = mutableCurrentChapter.asStateFlow()
 
+    override var currentlyPlayingPlaylistItem: Int
+        get() = internalPlayer.currentMediaItemIndex
+        set(value) {
+            assert(value in 0..<playlist.value.size) {
+                throw NewPlayerException("Playlist item selection out of bound: selected item index: $value, available chapters: ${playlist.value.size}")
+            }
+            internalPlayer.seekTo(value, 0)
+        }
+
     init {
         internalPlayer.addListener(object : Player.Listener {
             override fun onPlayerError(error: PlaybackException) {
@@ -349,13 +358,6 @@ class NewPlayerImpl(
         currentPosition = chapter.chapterStartInMs
     }
 
-    override fun selectPlaylistItem(index: Int) {
-        assert(index in 0..<playlist.value.size) {
-            throw NewPlayerException("Playlist item selection out of bound: selected item index: $index, available chapters: ${playlist.value.size}")
-        }
-        internalPlayer.seekTo(index, 0)
-    }
-
     private fun internalPlayStream(mediaItem: MediaItem, playMode: PlayMode) {
         if (internalPlayer.playbackState == Player.STATE_IDLE) {
             internalPlayer.prepare()

new-player/src/main/java/net/newpipe/newplayer/model/VideoPlayerUIState.kt

@@ -46,7 +46,8 @@ data class VideoPlayerUIState(
     val shuffleEnabled: Boolean,
     val repeatMode: RepeatMode,
     val playListDurationInS: Int,
-    val currentlyPlaying: PlaylistItem
+    val currentlyPlaying: PlaylistItem,
+    val currentPlaylistItemIndex: Int
 ) {
     companion object {
         val DEFAULT = VideoPlayerUIState(
@@ -70,7 +71,8 @@ data class VideoPlayerUIState(
             shuffleEnabled = false,
             repeatMode = RepeatMode.DONT_REPEAT,
             playListDurationInS = 0,
-            currentlyPlaying = PlaylistItem.DEFAULT
+            currentlyPlaying = PlaylistItem.DEFAULT,
+            currentPlaylistItemIndex = 0
         )
 
         val DUMMY = DEFAULT.copy(
@@ -87,7 +89,51 @@ data class VideoPlayerUIState(
             brightness = 0.2f,
             shuffleEnabled = true,
             playListDurationInS = 5493,
-            currentlyPlaying = PlaylistItem.DUMMY
+            currentlyPlaying = PlaylistItem.DUMMY,
+            currentPlaylistItemIndex = 1,
+            chapters = arrayListOf(
+                Chapter(
+                    chapterStartInMs = 5000,
+                    chapterTitle = "First Chapter",
+                    thumbnail = null
+                ),
+                Chapter(
+                    chapterStartInMs = 10000,
+                    chapterTitle = "Second Chapter",
+                    thumbnail = null
+                ),
+                Chapter(
+                    chapterStartInMs = 20000,
+                    chapterTitle = "Third Chapter",
+                    thumbnail = null
+                )
+            ),
+            playList = arrayListOf(
+                PlaylistItem(
+                    id = "6502",
+                    title = "Stream 1",
+                    creator = "The Creator",
+                    lengthInS = 6 * 60 + 5,
+                    thumbnail = null,
+                    uniqueId = 0
+                ),
+                PlaylistItem(
+                    id = "6502",
+                    title = "Stream 2",
+                    creator = "The Creator 2",
+                    lengthInS = 2 * 60 + 5,
+                    thumbnail = null,
+                    uniqueId = 1
+                ),
+                PlaylistItem(
+                    id = "6502",
+                    title = "Stream 3",
+                    creator = "The Creator 3",
+                    lengthInS = 29 * 60 + 5,
+                    thumbnail = null,
+                    uniqueId = 2
+                )
+            )
         )
     }
 }

new-player/src/main/java/net/newpipe/newplayer/model/VideoPlayerViewModelImpl.kt

@@ -30,6 +30,7 @@ import androidx.core.content.ContextCompat.getSystemService
 import androidx.lifecycle.AndroidViewModel
 import androidx.lifecycle.SavedStateHandle
 import androidx.lifecycle.viewModelScope
+import androidx.media3.common.MediaItem
 import androidx.media3.common.Player
 import dagger.hilt.android.lifecycle.HiltViewModel
 import kotlinx.coroutines.Job
@@ -42,7 +43,6 @@ import javax.inject.Inject
 import kotlinx.coroutines.flow.asStateFlow
 import kotlinx.coroutines.flow.update
 import kotlinx.coroutines.launch
-import net.newpipe.newplayer.Chapter
 import net.newpipe.newplayer.utils.VideoSize
 import net.newpipe.newplayer.NewPlayer
 import net.newpipe.newplayer.RepeatMode
@@ -194,13 +194,20 @@ class VideoPlayerViewModelImpl @Inject constructor(
             }
             viewModelScope.launch {
                 newPlayer.playlist.collect { playlist ->
-                    mutableUiState.update { it.copy(playList = playlist) }
+                    mutableUiState.update {
+                        it.copy(
+                            playList = playlist,
+                        )
+                    }
                 }
             }
             viewModelScope.launch {
                 newPlayer.currentlyPlaying.collect { playlistItem ->
                     mutableUiState.update {
-                        it.copy(currentlyPlaying = playlistItem ?: PlaylistItem.DEFAULT)
+                        it.copy(
+                            currentlyPlaying = playlistItem ?: PlaylistItem.DEFAULT,
+                            currentPlaylistItemIndex = newPlayer.currentlyPlayingPlaylistItem
+                        )
                     }
                 }
             }
@@ -261,12 +268,20 @@ class VideoPlayerViewModelImpl @Inject constructor(
 
     override fun prevStream() {
         resetHideUiDelayedJob()
-        Log.e(TAG, "imeplement prev stream")
+        newPlayer?.let { newPlayer ->
+            if (0 <= newPlayer.currentlyPlayingPlaylistItem - 1) {
+                newPlayer.currentlyPlayingPlaylistItem -= 1
+            }
+        }
     }
 
     override fun nextStream() {
         resetHideUiDelayedJob()
-        Log.e(TAG, "implement next stream")
+        newPlayer?.let { newPlayer ->
+            if (newPlayer.currentlyPlayingPlaylistItem + 1 < newPlayer.internalPlayer.mediaItemCount) {
+                newPlayer.currentlyPlayingPlaylistItem += 1
+            }
+        }
     }
 
     override fun showUi() {
@@ -427,7 +442,7 @@ class VideoPlayerViewModelImpl @Inject constructor(
             if (selectChapter) uiState.value.uiMode.getChapterSelectUiState()
             else uiState.value.uiMode.getStreamSelectUiState()
         )
-        if(selectChapter) {
+        if (selectChapter) {
             resetProgressUpdatePeriodicallyJob()
         } else {
             resetPlaylistProgressUpdaterJob()
@@ -468,8 +483,7 @@ class VideoPlayerViewModelImpl @Inject constructor(
     }
 
     override fun streamSelected(streamId: Int) {
-        println("gurken stream selected: $streamId")
+        newPlayer?.currentlyPlayingPlaylistItem = streamId
-        newPlayer?.selectPlaylistItem(streamId)
     }
 
     override fun cycleRepeatMode() {

new-player/src/main/java/net/newpipe/newplayer/ui/videoplayer/CenterUI.kt

@@ -21,9 +21,15 @@
 package net.newpipe.newplayer.ui.videoplayer
 
 import androidx.compose.animation.AnimatedVisibility
+import androidx.compose.animation.core.tween
+import androidx.compose.animation.fadeIn
+import androidx.compose.animation.fadeOut
 import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.BoxScope
 import androidx.compose.foundation.layout.PaddingValues
 import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.size
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.filled.Pause
@@ -33,6 +39,7 @@ import androidx.compose.material.icons.filled.SkipPrevious
 import androidx.compose.material3.Button
 import androidx.compose.material3.ButtonDefaults
 import androidx.compose.material3.Icon
+import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Surface
 import androidx.compose.runtime.Composable
 import androidx.compose.ui.Alignment
@@ -60,13 +67,22 @@ fun CenterUI(
         modifier = modifier,
     ) {
 
+        Box(modifier = Modifier.size(80.dp)) {
+            androidx.compose.animation.AnimatedVisibility(
+                uiState.currentPlaylistItemIndex != 0,
+                enter = fadeIn(animationSpec = tween(200)),
+                exit = fadeOut(animationSpec = tween(400))
+
+            ) {
                 CenterControllButton(
-            buttonModifier = Modifier.size(80.dp),
+                    buttonModifier = Modifier.fillMaxSize(),
                     iconModifier = Modifier.size(40.dp),
                     icon = Icons.Filled.SkipPrevious,
                     contentDescription = stringResource(R.string.widget_description_previous_stream),
                     onClick = viewModel::prevStream
                 )
+            }
+        }
 
         CenterControllButton(
             buttonModifier = Modifier.size(80.dp),
@@ -78,15 +94,22 @@ fun CenterUI(
             ),
             onClick = if (uiState.playing) viewModel::pause else viewModel::play
         )
-
+        Box(modifier = Modifier.size(80.dp)) {
+            androidx.compose.animation.AnimatedVisibility(
+                uiState.currentPlaylistItemIndex < uiState.playList.size - 1,
+                enter = fadeIn(animationSpec = tween(200)),
+                exit = fadeOut(animationSpec = tween(400))
+            ) {
                 CenterControllButton(
-            buttonModifier = Modifier.size(80.dp),
+                    buttonModifier = Modifier.fillMaxSize(),
                     iconModifier = Modifier.size(40.dp),
                     icon = Icons.Filled.SkipNext,
                     contentDescription = stringResource(R.string.widget_description_next_stream),
                     onClick = viewModel::nextStream
                 )
             }
+        }
+    }
 }
 
 @Composable
@@ -124,7 +147,8 @@ fun VideoPlayerControllerUICenterUIPreview() {
                 viewModel = VideoPlayerViewModelDummy(),
                 uiState = VideoPlayerUIState.DUMMY.copy(
                     isLoading = false,
-                    playing = true
+                    playing = true,
+                    currentPlaylistItemIndex = 1
                 )
             )
         }

new-player/src/main/java/net/newpipe/newplayer/ui/videoplayer/StreamSelectUI.kt

@@ -172,25 +172,7 @@ fun VideoPlayerChannelSelectUIPreview() {
             StreamSelectUI(
                 isChapterSelect = true,
                 viewModel = VideoPlayerViewModelDummy(),
-                uiState = VideoPlayerUIState.DEFAULT.copy(
+                uiState = VideoPlayerUIState.DUMMY
-                    chapters = arrayListOf(
-                        Chapter(
-                            chapterStartInMs = 5000,
-                            chapterTitle = "First Chapter",
-                            thumbnail = null
-                        ),
-                        Chapter(
-                            chapterStartInMs = 10000,
-                            chapterTitle = "Second Chapter",
-                            thumbnail = null
-                        ),
-                        Chapter(
-                            chapterStartInMs = 20000,
-                            chapterTitle = "Third Chapter",
-                            thumbnail = null
-                        ),
-                    )
-                )
             )
         }
     }
@@ -205,32 +187,6 @@ fun VideoPlayerStreamSelectUIPreview() {
                 isChapterSelect = false,
                 viewModel = VideoPlayerViewModelDummy(),
                 uiState = VideoPlayerUIState.DUMMY.copy(
-                    playList = arrayListOf(
-                        PlaylistItem(
-                            id = "6502",
-                            title = "Stream 1",
-                            creator = "The Creator",
-                            lengthInS = 6 * 60 + 5,
-                            thumbnail = null,
-                            uniqueId = 0
-                        ),
-                        PlaylistItem(
-                            id = "6502",
-                            title = "Stream 2",
-                            creator = "The Creator 2",
-                            lengthInS = 2 * 60 + 5,
-                            thumbnail = null,
-                            uniqueId = 1
-                        ),
-                        PlaylistItem(
-                            id = "6502",
-                            title = "Stream 3",
-                            creator = "The Creator 3",
-                            lengthInS = 29 * 60 + 5,
-                            thumbnail = null,
-                            uniqueId = 2
-                        )
-                    ),
                     currentlyPlaying = PlaylistItem.DUMMY.copy(uniqueId = 1)
                 )
             )