Functional player bar

musicus/lib/player.dart

@@ -31,7 +31,12 @@ class Player {
   /// Index of the currently played (or paused) track within the playlist.
   ///
   /// This will be zero, if the player is not active!
-  final currentTrack = BehaviorSubject.seeded(0);
+  final currentIndex = BehaviorSubject.seeded(0);
+
+  /// The currently played track.
+  /// 
+  /// This will be null, if there is no  current track.
+  final currentTrack = BehaviorSubject<InternalTrack>.seeded(null);
 
   /// Whether we are currently playing or not.
   ///
@@ -63,7 +68,7 @@ class Player {
   void _stop() {
     active.add(false);
     playlist.add([]);
-    currentTrack.add(0);
+    currentIndex.add(0);
     playing.add(false);
     position.add(const Duration());
     duration.add(const Duration(seconds: 1));
@@ -100,7 +105,8 @@ class Player {
 
           // TODO: Consider checking, whether values have actually changed.
           playlist.add(state.playlist);
-          currentTrack.add(state.currentTrack);
+          currentIndex.add(state.currentTrack);
+          currentTrack.add(state.playlist[state.currentTrack]);
           playing.add(state.playing);
           position.add(Duration(milliseconds: state.positionMs));
           duration.add(Duration(milliseconds: state.durationMs));
@@ -184,6 +190,9 @@ class Player {
   void dispose() {
     _playbackServiceStateSubscription.cancel();
     active.close();
+    playlist.close();
+    currentIndex.close();
+    currentTrack.close();
     playing.close();
     position.close();
     duration.close();

musicus/lib/screens/program.dart

@@ -5,6 +5,7 @@ import 'package:flutter/material.dart';
 import '../backend.dart';
 import '../music_library.dart';
 import '../widgets/play_pause_button.dart';
+import '../widgets/recording_tile.dart';
 
 class ProgramScreen extends StatefulWidget {
   @override
@@ -53,12 +54,13 @@ class _ProgramScreenState extends State<ProgramScreen> {
 
           if (playlist != null && playlist.isNotEmpty) {
             return StreamBuilder<int>(
-              stream: backend.player.currentTrack,
+              stream: backend.player.currentIndex,
               builder: (context, snapshot) {
                 if (snapshot.hasData) {
                   return ListView.builder(
                     itemCount: playlist.length,
                     itemBuilder: (context, index) {
+                      
                       final track = playlist[index];
 
                       return ListTile(
@@ -68,7 +70,9 @@ class _ProgramScreenState extends State<ProgramScreen> {
                                 width: 24.0,
                                 height: 24.0,
                               ),
-                        title: Text(track.track.fileName),
+                        title: RecordingTile(
+                          recordingId: track.track.recordingId,
+                        ),
                         onTap: () {
                           backend.player.skipTo(index);
                         },

musicus/lib/widgets/player_bar.dart

@@ -1,9 +1,12 @@
 import 'package:flutter/material.dart';
+import 'package:musicus/database.dart';
 
 import '../backend.dart';
+import '../music_library.dart';
 import '../screens/program.dart';
 
 import 'play_pause_button.dart';
+import 'texts.dart';
 
 class PlayerBar extends StatelessWidget {
   @override
@@ -28,15 +31,39 @@ class PlayerBar extends StatelessWidget {
                   child: Icon(Icons.keyboard_arrow_up),
                 ),
                 Expanded(
-                  child: Column(
+                  child: StreamBuilder<InternalTrack>(
-                    crossAxisAlignment: CrossAxisAlignment.start,
+                    stream: backend.player.currentTrack,
-                    children: <Widget>[
+                    builder: (context, snapshot) {
-                      Text(
+                      if (snapshot.data != null) {
-                        'Composer',
+                        final recordingId = snapshot.data.track.recordingId;
-                        style: TextStyle(fontWeight: FontWeight.bold),
+
-                      ),
+                        return FutureBuilder<Recording>(
-                      Text('Work: Movement'),
+                          future:
-                    ],
+                              backend.db.recordingById(recordingId).getSingle(),
+                          builder: (context, snapshot) {
+                            if (snapshot.hasData) {
+                              final workId = snapshot.data.work;
+
+                              return Column(
+                                crossAxisAlignment: CrossAxisAlignment.start,
+                                children: <Widget>[
+                                  DefaultTextStyle.merge(
+                                    style:
+                                        TextStyle(fontWeight: FontWeight.bold),
+                                    child: ComposersText(workId),
+                                  ),
+                                  WorkText(workId),
+                                ],
+                              );
+                            } else {
+                              return Container();
+                            }
+                          },
+                        );
+                      } else {
+                        return Container();
+                      }
+                    },
                   ),
                 ),
                 PlayPauseButton(),