feat: Add Share option for artists, albums, and tracks

This feature is only available on the Subsonic media provider. Using a
Jellyfin server will make Supersonic hide the "Share" option.

* Artists: Option available in grid view and in Artist view.
* Albums: Option available in grid view and in Album view.
* Tracks: Option available in tracklist, when a single track is selected.

ui/widgets/gridview.go

@@ -93,6 +93,7 @@ type GridViewState struct {
 	OnAddToQueue        func(id string)
 	OnAddToPlaylist     func(id string)
 	OnDownload          func(id string)
+	OnShare             func(id string)
 	OnShowItemPage      func(id string)
 	OnShowSecondaryPage func(id string)
 
@@ -407,8 +408,17 @@ func (g *GridView) showContextMenu(card *GridViewItem, pos fyne.Position) {
 			}
 		})
 		download.Icon = theme.DownloadIcon()
+		menuItems := []*fyne.MenuItem{play, shuffle, queue, playlist, download}
 
-		g.menu = widget.NewPopUpMenu(fyne.NewMenu("", play, shuffle, queue, playlist, download),
+		if g.OnShare != nil {
+			share := fyne.NewMenuItem("Share...", func() {
+				g.OnShare(g.menuGridViewItemId)
+			})
+			share.Icon = myTheme.ShareIcon
+			menuItems = append(menuItems, share)
+		}
+
+		g.menu = widget.NewPopUpMenu(fyne.NewMenu("", menuItems...),
 			fyne.CurrentApp().Driver().CanvasForObject(g))
 	}
 	g.menu.ShowAtPosition(pos)

ui/widgets/tracklist.go

@@ -72,6 +72,9 @@ type TracklistOptions struct {
 
 	// Disables the five star rating widget.
 	DisableRating bool
+
+	// Hides the sharing option.
+	HideSharing bool
 }
 
 type Tracklist struct {
@@ -87,6 +90,7 @@ type Tracklist struct {
 	OnSetFavorite   func(trackIDs []string, fav bool)
 	OnSetRating     func(trackIDs []string, rating int)
 	OnDownload      func(tracks []*mediaprovider.Track, downloadName string)
+	OnShare         func(trackID string)
 
 	OnShowArtistPage func(artistID string)
 	OnShowAlbumPage  func(albumID string)
@@ -108,6 +112,7 @@ type Tracklist struct {
 	list          *FocusList
 	ctxMenu       *fyne.Menu
 	ratingSubmenu *fyne.MenuItem
+	shareMenuItem *fyne.MenuItem
 	container     *fyne.Container
 }
 
@@ -555,6 +560,13 @@ func (t *Tracklist) onShowContextMenu(e *fyne.PointEvent, trackIdx int) {
 		})
 		unfavorite.Icon = myTheme.NotFavoriteIcon
 		t.ctxMenu.Items = append(t.ctxMenu.Items, playlist, download)
+		if !t.Options.HideSharing {
+			t.shareMenuItem = fyne.NewMenuItem("Share...", func() {
+				t.onShare(t.selectedTracks())
+			})
+			t.shareMenuItem.Icon = myTheme.ShareIcon
+			t.ctxMenu.Items = append(t.ctxMenu.Items, t.shareMenuItem)
+		}
 		t.ctxMenu.Items = append(t.ctxMenu.Items, fyne.NewMenuItemSeparator())
 		t.ctxMenu.Items = append(t.ctxMenu.Items, favorite, unfavorite)
 		t.ratingSubmenu = util.NewRatingSubmenu(func(rating int) {
@@ -567,6 +579,9 @@ func (t *Tracklist) onShowContextMenu(e *fyne.PointEvent, trackIdx int) {
 		}
 	}
 	t.ratingSubmenu.Disabled = t.Options.DisableRating
+	if t.shareMenuItem != nil {
+		t.shareMenuItem.Disabled = len(t.selectedTracks()) != 1
+	}
 	widget.ShowPopUpMenuAtPosition(t.ctxMenu, fyne.CurrentApp().Driver().CanvasForObject(t), e.AbsolutePosition)
 }
 
@@ -629,6 +644,15 @@ func (t *Tracklist) onDownload(tracks []*mediaprovider.Track, downloadName strin
 	}
 }
 
+func (t *Tracklist) onShare(tracks []*mediaprovider.Track) {
+	if t.OnShare != nil {
+		selectedTrackIDs := t.SelectedTrackIDs()
+		if len(selectedTrackIDs) > 0 {
+			t.OnShare(selectedTrackIDs[0])
+		}
+	}
+}
+
 func (t *Tracklist) selectedTracks() []*mediaprovider.Track {
 	t.tracksMutex.RLock()
 	defer t.tracksMutex.RUnlock()