refactor: get rid of browsingpane as play album mediator

ui/browsing/albumpage.go

@@ -26,8 +26,6 @@ type AlbumPage struct {
 	tracklist    *widgets.Tracklist
 	nowPlayingID string
 	container    *fyne.Container
-
-	OnPlayAlbum func(string, int)
 }
 
 type albumPageState struct {
@@ -84,10 +82,6 @@ func (a *AlbumPage) CreateRenderer() fyne.WidgetRenderer {
 	return widget.NewSimpleRenderer(a.container)
 }
 
-func (a *AlbumPage) SetPlayAlbumCallback(cb func(string, int)) {
-	a.OnPlayAlbum = cb
-}
-
 func (a *AlbumPage) Save() SavedPage {
 	s := a.albumPageState
 	return &s
@@ -115,9 +109,7 @@ func (a *AlbumPage) Tapped(*fyne.PointEvent) {
 }
 
 func (a *AlbumPage) onPlayTrackAt(tracknum int) {
-	if a.OnPlayAlbum != nil {
+	a.pm.PlayAlbum(a.albumID, tracknum)
-		a.OnPlayAlbum(a.albumID, tracknum)
-	}
 }
 
 func (a *AlbumPage) loadAsync() {

ui/browsing/albumspage.go

@@ -17,6 +17,7 @@ type AlbumsPage struct {
 	widget.BaseWidget
 
 	title      string
+	pm         *backend.PlaybackManager
 	im         *backend.ImageManager
 	lm         *backend.LibraryManager
 	nav        func(Route)
@@ -27,7 +28,6 @@ type AlbumsPage struct {
 	titleDisp  *widget.RichText
 	sortOrder  *selectWidget
 	container  *fyne.Container
-	OnPlayAlbum func(string, int)
 }
 
 type selectWidget struct {
@@ -51,9 +51,10 @@ func (s *selectWidget) MinSize() fyne.Size {
 	return fyne.NewSize(170, s.height)
 }
 
-func NewAlbumsPage(title string, sortOrder string, lm *backend.LibraryManager, im *backend.ImageManager, nav func(Route)) *AlbumsPage {
+func NewAlbumsPage(title string, sortOrder string, pm *backend.PlaybackManager, lm *backend.LibraryManager, im *backend.ImageManager, nav func(Route)) *AlbumsPage {
 	a := &AlbumsPage{
 		title: title,
+		pm:    pm,
 		lm:    lm,
 		im:    im,
 		nav:   nav,
@@ -98,6 +99,7 @@ func (a *AlbumsPage) createContainer(searchgrid bool) {
 func restoreAlbumsPage(saved *savedAlbumsPage) *AlbumsPage {
 	a := &AlbumsPage{
 		title: saved.title,
+		pm:    saved.pm,
 		lm:    saved.lm,
 		im:    saved.im,
 		nav:   saved.nav,
@@ -146,10 +148,6 @@ func (a *AlbumsPage) SearchWidget() fyne.Focusable {
 	return a.searcher.Entry
 }
 
-func (a *AlbumsPage) SetPlayAlbumCallback(cb func(string, int)) {
-	a.OnPlayAlbum = cb
-}
-
 func (a *AlbumsPage) Reload() {
 	if a.searchText != "" {
 		a.doSearch(a.searchText)
@@ -162,6 +160,7 @@ func (a *AlbumsPage) Reload() {
 func (a *AlbumsPage) Save() SavedPage {
 	sa := &savedAlbumsPage{
 		title:      a.title,
+		pm:         a.pm,
 		lm:         a.lm,
 		im:         a.im,
 		nav:        a.nav,
@@ -189,9 +188,7 @@ func (a *AlbumsPage) doSearch(query string) {
 }
 
 func (a *AlbumsPage) onPlayAlbum(albumID string) {
-	if a.OnPlayAlbum != nil {
+	a.pm.PlayAlbum(albumID, 0)
-		a.OnPlayAlbum(albumID, 0)
-	}
 }
 
 func (a *AlbumsPage) onShowArtistPage(artistID string) {
@@ -218,6 +215,7 @@ func (a *AlbumsPage) CreateRenderer() fyne.WidgetRenderer {
 type savedAlbumsPage struct {
 	title           string
 	searchText      string
+	pm              *backend.PlaybackManager
 	lm              *backend.LibraryManager
 	im              *backend.ImageManager
 	nav             func(Route)

ui/browsing/browsingpane.go

@@ -31,10 +31,6 @@ type Searchable interface {
 	SearchWidget() fyne.Focusable
 }
 
-type CanPlayAlbum interface {
-	SetPlayAlbumCallback(func(albumID string, startingTrack int))
-}
-
 type CanShowNowPlaying interface {
 	OnSongChange(song *subsonic.Child)
 }
@@ -98,11 +94,6 @@ func (b *BrowsingPane) doSetPage(p Page) bool {
 		return false
 	}
 	b.curPage = p
-	if pa, ok := p.(CanPlayAlbum); ok {
-		pa.SetPlayAlbumCallback(func(albumID string, firstTrack int) {
-			_ = b.app.PlaybackManager.PlayAlbum(albumID, firstTrack)
-		})
-	}
 	if np, ok := p.(CanShowNowPlaying); ok {
 		np.OnSongChange(b.app.PlaybackManager.NowPlaying())
 	}

ui/browsing/router.go

@@ -87,7 +87,7 @@ func (r Router) CreatePage(rte Route) Page {
 	case Album:
 		return NewAlbumPage(rte.Arg, r.App.ServerManager, r.App.PlaybackManager, r.App.LibraryManager, r.App.ImageManager, r.Controller, r.OpenRoute)
 	case Albums:
-		return NewAlbumsPage("Albums", rte.Arg, r.App.LibraryManager, r.App.ImageManager, r.OpenRoute)
+		return NewAlbumsPage("Albums", rte.Arg, r.App.PlaybackManager, r.App.LibraryManager, r.App.ImageManager, r.OpenRoute)
 	case Artist:
 		return NewArtistPage(rte.Arg, r.App.ServerManager, r.App.ImageManager, r.Controller, r.OpenRoute)
 	case Artists: