add Mac about menu override, minor MainWindow refactor

main.go

@@ -73,17 +73,7 @@ func main() {
 
 	}()
 
-	mainWindow.Show()
-	mainWindow.Window.SetCloseIntercept(func() {
-		mainWindow.SaveWindowSize()
-		if myApp.Config.Application.CloseToSystemTray &&
-			mainWindow.HaveSystemTray() {
-			mainWindow.Window.Hide()
-		} else {
-			fyneApp.Quit()
-		}
-	})
-	fyneApp.Run()
+	mainWindow.ShowAndRun()
 
 	log.Println("Running shutdown tasks...")
 	myApp.Shutdown()

ui/mainwindow.go

@@ -4,6 +4,7 @@ import (
 	"fmt"
 	"log"
 	"math"
+	"runtime"
 	"strings"
 	"time"
 
@@ -87,6 +88,18 @@ func NewMainWindow(fyneApp fyne.App, appName, displayAppName, appVersion string,
 	m.Controller.CurPageFunc = m.BrowsingPane.CurrentPage
 	m.Controller.RefreshPageFunc = m.BrowsingPane.RefreshPage
 
+	if runtime.GOOS == "darwin" {
+		// Fyne will extract out an "About" menu item and
+		// assign its action to the native Mac "About Supersonic" menu item
+		m.Window.SetMainMenu(fyne.NewMainMenu(
+			fyne.NewMenu("File", /*name doesn't matter*/
+				fyne.NewMenuItem("About", func() {
+					m.Window.Show()
+					m.Controller.ShowAboutDialog()
+				})),
+		))
+	}
+
 	m.BottomPanel = NewBottomPanel(app.PlaybackManager, app.ImageManager, m.Controller)
 	m.container = container.NewBorder(nil, m.BottomPanel, nil, nil, m.BrowsingPane)
 	m.Window.SetContent(m.container)
@@ -139,6 +152,16 @@ func NewMainWindow(fyneApp fyne.App, appName, displayAppName, appVersion string,
 	m.addNavigationButtons()
 	m.BrowsingPane.DisableNavigationButtons()
 	m.addShortcuts()
+
+	m.Window.SetCloseIntercept(func() {
+		m.SaveWindowSize()
+		if app.Config.Application.CloseToSystemTray && m.HaveSystemTray() {
+			m.Window.Hide()
+		} else {
+			fyneApp.Quit()
+		}
+	})
+
 	return m
 }
 
@@ -384,6 +407,10 @@ func (m *MainWindow) Show() {
 	m.Window.Show()
 }
 
+func (m *MainWindow) ShowAndRun() {
+	m.Window.ShowAndRun()
+}
+
 func (m *MainWindow) Canvas() fyne.Canvas {
 	return m.Window.Canvas()
 }