add rudimentary playlist page

backend/playbackmanager.go

@@ -108,12 +108,25 @@ func (p *PlaybackManager) LoadAlbum(albumID string, appendToQueue bool) error {
 	if err != nil {
 		return err
 	}
+	return p.LoadTracks(album.Song, appendToQueue)
+}
+
+// Loads the specified playlist into the play queue.
+func (p *PlaybackManager) LoadPlaylist(playlistID string, appendToQueue bool) error {
+	playlist, err := p.sm.Server.GetPlaylist(playlistID)
+	if err != nil {
+		return err
+	}
+	return p.LoadTracks(playlist.Entry, appendToQueue)
+}
+
+func (p *PlaybackManager) LoadTracks(tracks []*subsonic.Child, appendToQueue bool) error {
 	if !appendToQueue {
 		p.player.Stop()
 		p.nowPlayingIdx = 0
 		p.playQueue = nil
 	}
-	for _, song := range album.Song {
+	for _, song := range tracks {
 		url, err := p.sm.Server.GetStreamURL(song.ID, map[string]string{})
 		if err != nil {
 			return err
@@ -134,6 +147,16 @@ func (p *PlaybackManager) PlayAlbum(albumID string, firstTrack int) error {
 	return p.player.PlayTrackAt(firstTrack)
 }
 
+func (p *PlaybackManager) PlayPlaylist(playlistID string, firstTrack int) error {
+	if err := p.LoadPlaylist(playlistID, false); err != nil {
+		return err
+	}
+	if firstTrack <= 0 {
+		return p.player.PlayFromBeginning()
+	}
+	return p.player.PlayTrackAt(firstTrack)
+}
+
 func (p *PlaybackManager) checkScrobble(playDur time.Duration) {
 	if playDur.Seconds() < 0.1 || p.curTrackTime < 0.1 {
 		return

ui/browsing/playlistpage.go

@@ -0,0 +1,175 @@
+package browsing
+
+import (
+	"fmt"
+	"log"
+	"supersonic/backend"
+	"supersonic/ui/layouts"
+	"supersonic/ui/util"
+	"supersonic/ui/widgets"
+
+	"fyne.io/fyne/v2"
+	"fyne.io/fyne/v2/container"
+	"fyne.io/fyne/v2/theme"
+	"fyne.io/fyne/v2/widget"
+	"github.com/dweymouth/go-subsonic"
+)
+
+type PlaylistPage struct {
+	widget.BaseWidget
+
+	playlistID    string
+	sm            *backend.ServerManager
+	pm            *backend.PlaybackManager
+	nav           func(Route)
+	header        *PlaylistPageHeader
+	tracklist     *widgets.Tracklist
+	nowPlayingID  string
+	container     *fyne.Container
+	popUpProvider PopUpProvider
+}
+
+func NewPlaylistPage(
+	playlistID string,
+	sm *backend.ServerManager,
+	pm *backend.PlaybackManager,
+	nav func(Route),
+) *PlaylistPage {
+	a := &PlaylistPage{playlistID: playlistID, sm: sm, pm: pm}
+	a.ExtendBaseWidget(a)
+	a.header = NewPlaylistPageHeader(a)
+	a.tracklist = widgets.NewTracklist(nil)
+	a.tracklist.OnPlayTrackAt = a.onPlayTrackAt
+	a.container = container.NewBorder(
+		container.New(&layouts.MaxPadLayout{PadLeft: 15, PadRight: 15, PadTop: 15, PadBottom: 10}, a.header),
+		nil, nil, nil, container.New(&layouts.MaxPadLayout{PadLeft: 15, PadRight: 15, PadBottom: 15}, a.tracklist))
+	a.loadAsync()
+	return a
+}
+
+func (a *PlaylistPage) CreateRenderer() fyne.WidgetRenderer {
+	return widget.NewSimpleRenderer(a.container)
+}
+
+func (a *PlaylistPage) Save() SavedPage {
+	return &savedPlaylistPage{
+		playlistID: a.playlistID,
+		sm:         a.sm,
+		pm:         a.pm,
+		nav:        a.nav,
+	}
+}
+
+func (a *PlaylistPage) Route() Route {
+	return AlbumRoute(a.playlistID)
+}
+
+func (a *PlaylistPage) OnSongChange(song *subsonic.Child) {
+	if song == nil {
+		a.nowPlayingID = ""
+	} else {
+		a.nowPlayingID = song.ID
+	}
+	a.tracklist.SetNowPlaying(a.nowPlayingID)
+}
+
+func (a *PlaylistPage) Reload() {
+	a.loadAsync()
+}
+
+func (a *PlaylistPage) onPlayTrackAt(tracknum int) {
+	a.pm.PlayPlaylist(a.playlistID, tracknum)
+}
+
+func (a *PlaylistPage) loadAsync() {
+	go func() {
+		playlist, err := a.sm.Server.GetPlaylist(a.playlistID)
+		if err != nil {
+			log.Printf("Failed to get playlist: %s", err.Error())
+			return
+		}
+		a.header.Update(playlist)
+		a.tracklist.Tracks = playlist.Entry
+		a.tracklist.SetNowPlaying(a.nowPlayingID)
+	}()
+}
+
+type PlaylistPageHeader struct {
+	widget.BaseWidget
+
+	page *PlaylistPage
+
+	titleLabel       *widget.RichText
+	descriptionLabel *widget.Label
+	createdAtLabel   *widget.Label
+	ownerLabel       *widget.Label
+	trackTimeLabel   *widget.Label
+
+	playButton *widget.Button
+
+	container *fyne.Container
+}
+
+func NewPlaylistPageHeader(page *PlaylistPage) *PlaylistPageHeader {
+	a := &PlaylistPageHeader{page: page}
+	a.ExtendBaseWidget(a)
+
+	a.titleLabel = widget.NewRichTextWithText("")
+	a.titleLabel.Wrapping = fyne.TextTruncate
+	a.titleLabel.Segments[0].(*widget.TextSegment).Style = widget.RichTextStyle{
+		SizeName: theme.SizeNameHeadingText,
+	}
+	a.descriptionLabel = widget.NewLabel("")
+	a.ownerLabel = widget.NewLabel("")
+	a.createdAtLabel = widget.NewLabel("")
+	a.trackTimeLabel = widget.NewLabel("")
+	a.playButton = widget.NewButtonWithIcon("Play", theme.MediaPlayIcon(), func() {
+		page.onPlayTrackAt(0)
+	})
+
+	// Todo: there's got to be a way to make this less convoluted. Custom layout?
+	a.container = container.NewVBox(a.titleLabel, container.New(&layouts.VboxCustomPadding{ExtraPad: -10},
+		a.descriptionLabel,
+		a.ownerLabel,
+		a.trackTimeLabel,
+		a.createdAtLabel),
+		container.NewHBox(a.playButton),
+	)
+	return a
+}
+
+func (a *PlaylistPageHeader) CreateRenderer() fyne.WidgetRenderer {
+	return widget.NewSimpleRenderer(a.container)
+}
+
+func (a *PlaylistPageHeader) Update(playlist *subsonic.Playlist) {
+	a.titleLabel.Segments[0].(*widget.TextSegment).Text = playlist.Name
+	a.descriptionLabel.SetText(playlist.Comment)
+	a.ownerLabel.SetText(a.formatPlaylistOwnerStr(playlist))
+	a.trackTimeLabel.SetText(a.formatPlaylistTrackTimeStr(playlist))
+	a.createdAtLabel.SetText("created at TODO")
+	a.Refresh()
+}
+
+func (a *PlaylistPageHeader) formatPlaylistOwnerStr(p *subsonic.Playlist) string {
+	pubPriv := "Public"
+	if !p.Public {
+		pubPriv = "Private"
+	}
+	return fmt.Sprintf("%s playlist by %s", pubPriv, p.Owner)
+}
+
+func (a *PlaylistPageHeader) formatPlaylistTrackTimeStr(p *subsonic.Playlist) string {
+	return fmt.Sprintf("%d tracks, %s", p.SongCount, util.SecondsToTimeString(float64(p.Duration)))
+}
+
+type savedPlaylistPage struct {
+	playlistID string
+	sm         *backend.ServerManager
+	pm         *backend.PlaybackManager
+	nav        func(Route)
+}
+
+func (s *savedPlaylistPage) Restore() Page {
+	return NewPlaylistPage(s.playlistID, s.sm, s.pm, s.nav)
+}

ui/browsing/playlistspage.go

@@ -34,8 +34,7 @@ func NewPlaylistsPage(sm *backend.ServerManager, nav func(Route)) *PlaylistsPage
 	a.titleDisp.Segments[0].(*widget.TextSegment).Style.SizeName = theme.SizeNameHeadingText
 	a.list = NewPlaylistList()
 	a.list.OnNavTo = func(id string) {
-		log.Println("opening playlist", id)
+		nav(PlaylistRoute(id))
-		//nav(PlaylistRoute(id))
 	}
 	a.buildContainer()
 	go a.loadAsync()

ui/browsing/router.go

@@ -51,6 +51,9 @@ func GenresRoute() Route {
 	return Route{Page: Genres}
 }
 
+func PlaylistRoute(id string) Route {
+	return Route{Page: Playlist, Arg: id}
+}
 func PlaylistsRoute() Route {
 	return Route{Page: Playlists}
 }
@@ -109,6 +112,8 @@ func (r Router) CreatePage(rte Route) Page {
 		return NewGenrePage(rte.Arg, r.App.LibraryManager, r.App.ImageManager, r.OpenRoute)
 	case Genres:
 		return NewArtistsGenresPage(true, r.App.ServerManager, r.OpenRoute)
+	case Playlist:
+		return NewPlaylistPage(rte.Arg, r.App.ServerManager, r.App.PlaybackManager, r.OpenRoute)
 	case Playlists:
 		return NewPlaylistsPage(r.App.ServerManager, r.OpenRoute)
 	}