Reduce direct dependency on Player even more

backend/playbackmanager.go

@@ -40,6 +40,7 @@ type PlaybackManager struct {
 
 	onSongChange     []func(nowPlaying, justScrobbledIfAny *mediaprovider.Track)
 	onPlayTimeUpdate []func(float64, float64)
+	onLoopModeChange []func(string)
 }
 
 func NewPlaybackManager(
@@ -128,6 +129,11 @@ func (p *PlaybackManager) OnPlayTimeUpdate(cb func(float64, float64)) {
 	p.onPlayTimeUpdate = append(p.onPlayTimeUpdate, cb)
 }
 
+// Registers a callback that is notified whenever the loop mode changes.
+func (p *PlaybackManager) OnLoopModeChange(cb func(string)) {
+	p.onLoopModeChange = append(p.onLoopModeChange, cb)
+}
+
 // Loads the specified album into the play queue.
 func (p *PlaybackManager) LoadAlbum(albumID string, appendToQueue bool, shuffle bool) error {
 	album, err := p.sm.Server.GetAlbum(albumID)
@@ -294,7 +300,17 @@ func (p *PlaybackManager) SetReplayGainOptions(config ReplayGainConfig) {
 // Changes the loop mode of the player to the next one.
 // Useful for toggling UI elements, to change modes without knowing the current player mode.
 func (p *PlaybackManager) SetNextLoopMode() error {
-	return p.player.SetNextLoopMode()
+	if err := p.player.SetNextLoopMode(); err != nil {
+		return err
+	}
+
+	defer func() {
+		for _, cb := range p.onLoopModeChange {
+			cb(p.player.GetLoopMode().String())
+		}
+	}()
+
+	return nil
 }
 
 // call BEFORE updating p.nowPlayingIdx

player/player.go

@@ -116,12 +116,11 @@ type Player struct {
 	bgCancel context.CancelFunc
 
 	// callbacks
-	onPaused          []func()
-	onStopped         []func()
-	onPlaying         []func()
-	onSeek            []func()
-	onLoopModeChanged []func(string)
-	onTrackChange     []func(int64)
+	onPaused      []func()
+	onStopped     []func()
+	onPlaying     []func()
+	onSeek        []func()
+	onTrackChange []func(int64)
 }
 
 // Returns a new player.
@@ -400,7 +399,12 @@ func (p *Player) PlayPause() error {
 	}
 }
 
-// Sets the loop mode of the player.
+// Get the loop mode of the player.
+func (p *Player) GetLoopMode() LoopMode {
+	return p.loopMode
+}
+
+// Set the loop mode of the player.
 func (p *Player) SetLoopMode(mode LoopMode) error {
 	if !p.initialized {
 		return ErrUnitialized
@@ -413,22 +417,20 @@ func (p *Player) SetLoopMode(mode LoopMode) error {
 
 	switch mode {
 	case LoopNone:
-		p.mpv.SetOptionString("loop-playlist", "no")
+		if err := p.mpv.SetOptionString("loop-playlist", "no"); err != nil {
+			return err
+		}
 	case LoopAll:
-		p.mpv.SetOptionString("loop-playlist", "inf")
+		if err := p.mpv.SetOptionString("loop-playlist", "inf"); err != nil {
+			return err
+		}
 	}
 	p.loopMode = mode
 
-	defer func() {
-		for _, cb := range p.onLoopModeChanged {
-			cb(p.loopMode.String())
-		}
-	}()
-
 	return nil
 }
 
-// Changes the loop mode of the player to the next one.
+// Change the loop mode of the player to the next one.
 // Useful for toggling UI elements, to change modes without knowing the current player mode.
 func (p *Player) SetNextLoopMode() error {
 	switch p.loopMode {
@@ -542,11 +544,6 @@ func (p *Player) OnSeek(cb func()) {
 	p.onSeek = append(p.onSeek, cb)
 }
 
-// Registers a callback which is invoked when the player enables queue repeat.
-func (p *Player) OnLoopModeChanged(cb func(string)) {
-	p.onLoopModeChanged = append(p.onLoopModeChanged, cb)
-}
-
 // Registers a callback which is invoked when the currently playing track changes,
 // or when playback begins at any time from the Stopped state.
 // Callback is invoked with the index of the currently playing track (zero-based).

ui/bottompanel.go

@@ -54,7 +54,7 @@ func NewBottomPanel(p *player.Player, pm *backend.PlaybackManager, contr *contro
 	p.OnStopped(func() {
 		bp.Controls.SetPlaying(false)
 	})
-	p.OnLoopModeChanged(func(mode string) {
+	pm.OnLoopModeChange(func(mode string) {
 		bp.Controls.SetLoopMode(mode)
 	})