first commit

ui/albumgrid.go

@@ -0,0 +1,85 @@
+package ui
+
+import (
+	"gomuse/backend"
+
+	"fyne.io/fyne/v2"
+	"fyne.io/fyne/v2/widget"
+	"github.com/dweymouth/go-subsonic"
+)
+
+type AlbumGrid struct {
+	widget.BaseWidget
+
+	grid     *widget.GridWrapList
+	albums   []*subsonic.AlbumID3
+	iter     backend.AlbumIterator
+	fetching bool
+	done     bool
+}
+
+var _ fyne.Widget = (*AlbumGrid)(nil)
+
+func NewAlbumGrid(iter backend.AlbumIterator, pm *backend.PlaybackManager, im *backend.ImageManager) *AlbumGrid {
+	ag := &AlbumGrid{
+		iter: iter,
+	}
+	ag.ExtendBaseWidget(ag)
+
+	g := widget.NewGridWrapList(
+		func() int {
+			return len(ag.albums)
+		},
+		// create func
+		func() fyne.CanvasObject {
+			ac := NewAlbumCard()
+			ac.OnTapped = func() {
+				pm.PlayAlbum(ac.AlbumID())
+			}
+			return ac
+		},
+		// update func
+		func(itemID int, obj fyne.CanvasObject) {
+			ac := obj.(*AlbumCard)
+			ac.Update(ag.albums[itemID])
+			// TODO: set image to a placeholder before spinning off async fetch
+			go func() {
+				i, err := im.GetAlbumThumbnail(ag.albums[itemID].ID)
+				if err == nil {
+					ac.Cover.SetImage(i)
+					ac.Refresh()
+				}
+			}()
+
+			// TODO: remove magic number 10
+			if !ag.done && !ag.fetching && itemID > len(ag.albums)-10 {
+				ag.fetchMoreAlbums(10)
+			}
+		},
+	)
+	ag.grid = g
+
+	// fetch initial albums
+	ag.fetchMoreAlbums(36)
+	return ag
+}
+
+func (a *AlbumGrid) fetchMoreAlbums(count int) {
+	i := 0
+	a.fetching = true
+	a.iter.NextN(count, func(al *subsonic.AlbumID3) {
+		if al == nil {
+			a.done = true
+			return
+		}
+		a.albums = append(a.albums, al)
+		i++
+		if i == count {
+			a.fetching = false
+		}
+	})
+}
+
+func (a *AlbumGrid) CreateRenderer() fyne.WidgetRenderer {
+	return widget.NewSimpleRenderer(a.grid)
+}