fix: cache status not updated

lib/ui/screens/info_sheet.dart

@@ -251,8 +251,8 @@ class AlbumInfoPane extends StatelessWidget {
   }
 }
 
-showInfoSheet(BuildContext context, {required Song song}) {
-  showModalBottomSheet(
+Future<void> showInfoSheet(BuildContext context, {required Song song}) {
+  return showModalBottomSheet<void>(
     context: context,
     isScrollControlled: true,
     backgroundColor: Colors.transparent,

lib/ui/screens/now_playing.dart

@@ -84,7 +84,7 @@ class NowPlayingScreen extends StatelessWidget {
               ],
             ),
             const SizedBox(height: 8),
-            const ProgressBar(),
+            ProgressBar(song: song),
           ],
         );
 

lib/ui/widgets/now_playing/progress_bar.dart

@@ -1,21 +1,20 @@
-import 'package:app/extensions/assets_audio_player.dart';
 import 'package:app/extensions/duration.dart';
 import 'package:app/mixins/stream_subscriber.dart';
+import 'package:app/models/song.dart';
 import 'package:app/providers/audio_provider.dart';
-import 'package:app/providers/song_provider.dart';
 import 'package:flutter/material.dart';
 import 'package:provider/provider.dart';
 
 class ProgressBar extends StatefulWidget {
-  const ProgressBar({Key? key}) : super(key: key);
+  final Song song;
+
+  const ProgressBar({Key? key, required this.song}) : super(key: key);
 
   _ProgressBarState createState() => _ProgressBarState();
 }
 
 class _ProgressBarState extends State<ProgressBar> with StreamSubscriber {
   late final AudioProvider audio;
-  late final SongProvider songProvider;
-
   late Duration _duration, _position;
 
   TextStyle timeStampStyle = const TextStyle(
@@ -27,19 +26,25 @@ class _ProgressBarState extends State<ProgressBar> with StreamSubscriber {
   void initState() {
     super.initState();
     audio = context.read();
-    songProvider = context.read();
 
-    setState(() {
-      _duration = Duration(
-        seconds: songProvider.byId(audio.player.songId!).length.toInt(),
-      );
-    });
+    setState(() => _duration = Duration(seconds: widget.song.length.toInt()));
 
     subscribe(audio.player.currentPosition.listen((position) {
       setState(() => _position = position);
     }));
   }
 
+  /// Since this widget is rendered inside NowPlayingScreen, change to current
+  /// song in the parent will not trigger initState() and as a result not
+  /// refresh the progress bar's values.
+  /// For that, we hook into didUpdateWidget().
+  /// See https://stackoverflow.com/questions/54759920/flutter-why-is-child-widgets-initstate-is-not-called-on-every-rebuild-of-pa.
+  @override
+  void didUpdateWidget(covariant ProgressBar oldWidget) {
+    super.didUpdateWidget(oldWidget);
+    setState(() => _duration = Duration(seconds: widget.song.length.toInt()));
+  }
+
   @override
   void dispose() {
     unsubscribeAll();

lib/ui/widgets/song_cache_icon.dart

@@ -39,6 +39,22 @@ class _SongCacheIconState extends State<SongCacheIcon> with StreamSubscriber {
     });
   }
 
+  /// Since this widget is rendered inside NowPlayingScreen, change to current
+  /// song in the parent will not trigger initState() and as a result not
+  /// refresh the song's cache status.
+  /// For that, we hook into didUpdateWidget().
+  /// See https://stackoverflow.com/questions/54759920/flutter-why-is-child-widgets-initstate-is-not-called-on-every-rebuild-of-pa.
+  @override
+  void didUpdateWidget(covariant SongCacheIcon oldWidget) {
+    super.didUpdateWidget(oldWidget);
+    _resolveCacheStatus();
+  }
+
+  Future<void> _resolveCacheStatus() async {
+    bool hasState = await cache.hasCache(song: widget.song);
+    setState(() => _hasCache = hasState);
+  }
+
   @override
   void dispose() {
     unsubscribeAll();