From bc8a04e5442ba3abe1b04ab325769559f37d9802 Mon Sep 17 00:00:00 2001
From: Kingkor Roy Tirtho <krtirtho@gmail.com>
Date: Wed, 7 Dec 2022 12:22:11 +0600
Subject: [PATCH] feat: pause track when seeking forward/back and keep audio
 session alive when paused/interrupted

---
 lib/provider/Playback.dart           | 4 ++++
 lib/services/MobileAudioService.dart | 9 ++++-----
 2 files changed, 8 insertions(+), 5 deletions(-)

diff --git a/lib/provider/Playback.dart b/lib/provider/Playback.dart
index e7207fd6..ffe755c0 100644
--- a/lib/provider/Playback.dart
+++ b/lib/provider/Playback.dart
@@ -202,6 +202,7 @@ class Playback extends PersistedChangeNotifier {
       if (index < 0 || index > playlist.tracks.length - 1) return;
       if (isPlaying || status == PlaybackStatus.playing) await stop();
       this.playlist = playlist;
+      mobileAudioService?.session?.setActive(true);
       final played = this.playlist!.tracks[index];
       status = PlaybackStatus.loading;
       notifyListeners();
@@ -320,6 +321,7 @@ class Playback extends PersistedChangeNotifier {
   }
 
   Future<void> stop() async {
+    mobileAudioService?.session?.setActive(false);
     await player.stop();
     await player.release();
     isPlaying = false;
@@ -634,6 +636,7 @@ class Playback extends PersistedChangeNotifier {
         (playlist!.trackIds.indexOf(track!.id!) + 1).toInt();
     // checking if there's any track available forward
     if (nextTrackIndex > (playlist?.tracks.length ?? 0) - 1) return;
+    await pause();
     await play(playlist!.tracks.elementAt(nextTrackIndex)).then((_) {
       playlist!.tracks[nextTrackIndex] = track!;
     });
@@ -645,6 +648,7 @@ class Playback extends PersistedChangeNotifier {
         (playlist!.trackIds.indexOf(track!.id!) - 1).toInt();
     // checking if there's any track available behind
     if (prevTrackIndex < 0) return;
+    await pause();
     await play(playlist!.tracks.elementAt(prevTrackIndex)).then((_) {
       playlist!.tracks[prevTrackIndex] = track!;
     });
diff --git a/lib/services/MobileAudioService.dart b/lib/services/MobileAudioService.dart
index 87109ef8..9f999f53 100644
--- a/lib/services/MobileAudioService.dart
+++ b/lib/services/MobileAudioService.dart
@@ -18,18 +18,18 @@ class MobileAudioService extends BaseAudioHandler {
         }
       });
     });
-    final _player = playback.player;
-    _player.onPlayerStateChanged.listen((state) async {
+    final player = playback.player;
+    player.onPlayerStateChanged.listen((state) async {
       if (state != PlayerState.completed) {
         playbackState.add(await _transformEvent());
       }
     });
 
-    _player.onPositionChanged.listen((pos) async {
+    player.onPositionChanged.listen((pos) async {
       playbackState.add(await _transformEvent());
     });
 
-    _player.onPlayerComplete.listen((_) {
+    player.onPlayerComplete.listen((_) {
       if (playback.playlist == null && playback.track == null) {
         playbackState.add(
           PlaybackState(
@@ -56,7 +56,6 @@ class MobileAudioService extends BaseAudioHandler {
 
   @override
   Future<void> stop() async {
-    await session?.setActive(true);
     await playback.stop();
   }