hook up seek for synced lyrics

ui/bottompanel.go

@@ -35,7 +35,7 @@ func NewBottomPanel(pm *backend.PlaybackManager, contr *controller.Controller) *
 	bp.ExtendBaseWidget(bp)
 
 	pm.OnSongChange(bp.onSongChange)
-	pm.OnPlayTimeUpdate(func(cur, total float64) {
+	pm.OnPlayTimeUpdate(func(cur, total float64, _ bool) {
 		if !pm.IsSeeking() {
 			bp.Controls.UpdatePlayTime(cur, total)
 		}

ui/browsing/browsingpane.go

@@ -46,7 +46,7 @@ type CanShowNowPlaying interface {
 }
 
 type CanShowPlayTime interface {
-	OnPlayTimeUpdate(curTime, totalTime float64)
+	OnPlayTimeUpdate(curTime, totalTime float64, seeked bool)
 }
 
 type CanShowPlayQueue interface {
@@ -222,12 +222,12 @@ func (b *BrowsingPane) onSongChange(song, lastScrobbledIfAny *mediaprovider.Trac
 	}
 }
 
-func (b *BrowsingPane) onPlayTimeUpdate(cur, total float64) {
+func (b *BrowsingPane) onPlayTimeUpdate(cur, total float64, seeked bool) {
 	if b.curPage == nil {
 		return
 	}
 	if p, ok := b.curPage.(CanShowPlayTime); ok {
-		p.OnPlayTimeUpdate(cur, total)
+		p.OnPlayTimeUpdate(cur, total, seeked)
 	}
 }
 

ui/browsing/nowplayingpage.go

@@ -241,9 +241,13 @@ func (s *nowPlayingPageState) Restore() Page {
 
 var _ CanShowPlayTime = (*NowPlayingPage)(nil)
 
-func (a *NowPlayingPage) OnPlayTimeUpdate(curTime, _ float64) {
+func (a *NowPlayingPage) OnPlayTimeUpdate(curTime, _ float64, seeked bool) {
 	a.formatStatusLine()
-	a.lyricsViewer.UpdatePlayPos(curTime)
+	if seeked {
+		a.lyricsViewer.OnSeeked(curTime)
+	} else {
+		a.lyricsViewer.UpdatePlayPos(curTime)
+	}
 }
 
 var _ CanSelectAll = (*NowPlayingPage)(nil)

ui/widgets/lyricsviewer.go

@@ -15,6 +15,7 @@ type LyricsViewer struct {
 	viewer        *fynelyrics.LyricsViewer
 	lyrics        *mediaprovider.Lyrics
 	nextLyricLine int
+	lastPlayPos   float64
 
 	container *fyne.Container
 	isEmpty   bool
@@ -61,6 +62,11 @@ func (l *LyricsViewer) UpdatePlayPos(timeSecs float64) {
 	if l.lyrics == nil || !l.lyrics.Synced {
 		return
 	}
+	if timeSecs < l.lastPlayPos {
+		l.OnSeeked(timeSecs)
+		return
+	}
+	l.lastPlayPos = timeSecs
 	// advance if needed
 	if l.lyrics.Lines[l.nextLyricLine].Start <= timeSecs {
 		l.viewer.NextLine()
@@ -71,6 +77,7 @@ func (l *LyricsViewer) UpdatePlayPos(timeSecs float64) {
 }
 
 func (l *LyricsViewer) OnSeeked(timeSecs float64) {
+	l.lastPlayPos = timeSecs
 	if l.lyrics == nil || !l.lyrics.Synced {
 		return
 	}