add system tray + close to tray support (no settigs UI yet)

backend/config.go

@@ -20,6 +20,8 @@ type AppConfig struct {
 	WindowWidth        int
 	WindowHeight       int
 	LastCheckedVersion string
+	EnableSystemTray   bool
+	CloseToSystemTray  bool
 }
 
 type AlbumPageConfig struct {
@@ -87,6 +89,8 @@ func DefaultConfig(appVersionTag string) *Config {
 			WindowWidth:        1000,
 			WindowHeight:       800,
 			LastCheckedVersion: appVersionTag,
+			EnableSystemTray:   true,
+			CloseToSystemTray:  false,
 		},
 		AlbumPage: AlbumPageConfig{
 			TracklistColumns: []string{"Artist", "Time", "Plays", "Favorite"},

main.go

@@ -57,10 +57,15 @@ func main() {
 	mainWindow.Window.SetCloseIntercept(func() {
 		myApp.Config.Application.WindowHeight = int(mainWindow.Canvas().Size().Height)
 		myApp.Config.Application.WindowWidth = int(mainWindow.Canvas().Size().Width)
-		mainWindow.Window.Close()
+		if myApp.Config.Application.CloseToSystemTray &&
+			mainWindow.HaveSystemTray() {
+			mainWindow.Window.Hide()
+		} else {
+			fyneApp.Quit()
+		}
 	})
 	fyneApp.Run()
 
-	// shutdown tasks
+	log.Println("Running shutdown tasks...")
 	myApp.Shutdown()
 }

ui/mainwindow.go

@@ -40,7 +40,8 @@ type MainWindow struct {
 	BrowsingPane *browsing.BrowsingPane
 	BottomPanel  *BottomPanel
 
-	container *fyne.Container
+	haveSystemTray bool
+	container      *fyne.Container
 }
 
 var (
@@ -54,6 +55,9 @@ func NewMainWindow(fyneApp fyne.App, appName, appVersion string, app *backend.Ap
 		BrowsingPane: browsing.NewBrowsingPane(app),
 	}
 
+	if app.Config.Application.EnableSystemTray {
+		m.SetupSystemTrayMenu(appName, fyneApp)
+	}
 	m.Controller = &controller.Controller{
 		AppVersion: appVersion,
 		MainWindow: m.Window,
@@ -123,6 +127,32 @@ func NewMainWindow(fyneApp fyne.App, appName, appVersion string, app *backend.Ap
 	return m
 }
 
+func (m *MainWindow) SetupSystemTrayMenu(appName string, fyneApp fyne.App) {
+	if desk, ok := fyneApp.(desktop.App); ok {
+		menu := fyne.NewMenu(appName,
+			fyne.NewMenuItem("Play/Pause", func() {
+				m.App.Player.PlayPause()
+			}),
+			fyne.NewMenuItem("Previous", func() {
+				m.App.Player.SeekBackOrPrevious()
+			}),
+			fyne.NewMenuItem("Next", func() {
+				m.App.Player.SeekNext()
+			}),
+			fyne.NewMenuItemSeparator(),
+			fyne.NewMenuItem("Show", func() {
+				m.Show()
+			}))
+		desk.SetSystemTrayMenu(menu)
+		desk.SetSystemTrayIcon(res.ResAppicon250Png)
+		m.haveSystemTray = true
+	}
+}
+
+func (m *MainWindow) HaveSystemTray() bool {
+	return m.haveSystemTray
+}
+
 func (m *MainWindow) ShowNewVersionDialog(appName, versionTag string) {
 	contentStr := fmt.Sprintf("A new version of %s (%s) is available",
 		appName, versionTag)