hook up tap handling and action dispatch

ui/widgets/gridview.go

@@ -133,6 +133,7 @@ type GridViewState struct {
 	OnPlayNext          func(id string)
 	OnAddToQueue        func(id string)
 	OnAddToPlaylist     func(id string)
+	OnFavorite          func(id string, fav bool)
 	OnDownload          func(id string)
 	OnShare             func(id string)
 	OnShowItemPage      func(id string)
@@ -280,6 +281,11 @@ func (g *GridView) createNewItemCard() fyne.CanvasObject {
 	card.ImgLoader = util.NewThumbnailLoader(g.imageFetcher, card.Cover.SetImage)
 	card.ImgLoader.OnBeforeLoad = func() { card.Cover.SetImage(nil) }
 	card.OnPlay = func() { g.onPlay(card.ItemID(), false) }
+	card.OnFavorite = func(fav bool) {
+		if g.OnFavorite != nil {
+			g.OnFavorite(card.itemID, fav)
+		}
+	}
 	card.OnShowSecondaryPage = func(id string) {
 		if g.OnShowSecondaryPage != nil {
 			g.OnShowSecondaryPage(id)
@@ -342,7 +348,7 @@ func (g *GridView) doUpdateItemCard(itemIdx int, card *GridViewItem) {
 	}
 	card.Cover.Im.PlaceholderIcon = g.Placeholder
 	g.stateMutex.Unlock()
-	card.Update(item)
+	card.Update(&item)
 	card.ImgLoader.Load(item.CoverArtID)
 
 	// if user has scrolled near the bottom, fetch more