Add fix for application menu. Add docs

Author: leaanthony

docs/src/content/docs/learn/application-menu.mdx

@@ -16,6 +16,43 @@ Create a new application menu using the `NewMenu` method:
 menu := app.NewMenu()
 ```
 
+## Setting the Menu
+
+The way to set the menu varies on the platform:
+
+<Tabs>
+    <TabItem label="macOS" icon="fa-brands:apple">
+
+        On macOS, there is only one menu bar per application. Set the menu using the `SetMenu` method of the application:
+
+        ```go
+        app.SetMenu(menu)
+        ```
+
+    </TabItem>
+
+    <TabItem label="Windows" icon="fa-brands:windows">
+
+        On Windows, there is a menu bar per window. Set the menu using the `SetMenu` method of the window:
+
+        ```go
+        window.SetMenu(menu)
+        ```
+
+    </TabItem>
+
+    <TabItem label="Linux" icon="fa-brands:linux">
+
+        On Linux, the menu bar is typically per window. Set the menu using the `SetMenu` method of the window:
+
+        ```go
+        window.SetMenu(menu)
+        ```
+
+    </TabItem>
+</Tabs>
+
+
 ## Menu Roles
 
 Wails provides predefined menu roles that automatically create platform-appropriate menu structures:

v3/examples/menu/main.go

@@ -27,16 +27,7 @@ func main() {
 	if runtime.GOOS == "darwin" {
 		menu.AddRole(application.AppMenu)
 	}
-	fileMenu := menu.AddRole(application.FileMenu)
-	_ = fileMenu
-	//fileMenu.FindByRole(application.Open).OnClick(func(context *application.Context) {
-	//	selection, err := application.OpenFileDialog().PromptForSingleSelection()
-	//	if err != nil {
-	//		println("Error: " + err.Error())
-	//		return
-	//	}
-	//	println("You selected: " + selection)
-	//})
+	menu.AddRole(application.FileMenu)
 	menu.AddRole(application.EditMenu)
 	menu.AddRole(application.WindowMenu)
 	menu.AddRole(application.HelpMenu)
@@ -124,7 +115,8 @@ func main() {
 	})
 	app.SetMenu(menu)
 
-	app.NewWebviewWindow().SetBackgroundColour(application.NewRGB(33, 37, 41))
+	window := app.NewWebviewWindow().SetBackgroundColour(application.NewRGB(33, 37, 41))
+	window.SetMenu(menu)
 
 	err := app.Run()
 

v3/pkg/application/webview_window.go

@@ -108,6 +108,7 @@ type (
 		showMenuBar()
 		hideMenuBar()
 		toggleMenuBar()
+		setMenu(menu *Menu)
 	}
 )
 
@@ -168,6 +169,22 @@ type WebviewWindow struct {
 	unconditionallyClose bool
 }
 
+func (w *WebviewWindow) SetMenu(menu *Menu) {
+	switch runtime.GOOS {
+	case "darwin":
+		return
+	case "windows":
+		w.options.Windows.Menu = menu
+	case "linux":
+		w.options.Linux.Menu = menu
+	}
+	if w.impl != nil {
+		InvokeSync(func() {
+			w.impl.setMenu(menu)
+		})
+	}
+}
+
 // EmitEvent emits an event from the window
 func (w *WebviewWindow) EmitEvent(name string, data ...any) {
 	globalApplication.emitEvent(&CustomEvent{

v3/pkg/application/webview_window_darwin.go

@@ -1427,6 +1427,7 @@ func (w *macosWebviewWindow) delete() {
 func (w *macosWebviewWindow) redo() {
 }
 
-func (w *macosWebviewWindow) showMenuBar()   {}
-func (w *macosWebviewWindow) hideMenuBar()   {}
-func (w *macosWebviewWindow) toggleMenuBar() {}
+func (w *macosWebviewWindow) showMenuBar()    {}
+func (w *macosWebviewWindow) hideMenuBar()    {}
+func (w *macosWebviewWindow) toggleMenuBar()  {}
+func (w *macosWebviewWindow) setMenu(_ *Menu) {}

v3/pkg/application/webview_window_linux.go

@@ -235,6 +235,15 @@ func (w *linuxWebviewWindow) setPhysicalBounds(physicalBounds Rect) {
 	w.setBounds(physicalBounds)
 }
 
+func (w *linuxWebviewWindow) setMenu(menu *Menu) {
+	if menu == nil {
+		w.gtkmenu = nil
+		return
+	}
+	w.parent.options.Linux.Menu = menu
+	w.gtkmenu = (menu.impl).(*linuxMenu).native
+}
+
 func (w *linuxWebviewWindow) run() {
 	for eventId := range w.parent.eventListeners {
 		w.on(eventId)

v3/pkg/application/webview_window_windows.go

@@ -73,6 +73,13 @@ type windowsWebviewWindow struct {
 	isMinimizing bool
 }
 
+func (w *windowsWebviewWindow) setMenu(menu *Menu) {
+	menu.Update()
+	w.menu = NewApplicationMenu(w, menu)
+	w.menu.parentWindow = w
+	w32.SetMenu(w.hwnd, w.menu.menu)
+}
+
 func (w *windowsWebviewWindow) cut() {
 	w.execJS("document.execCommand('cut')")
 }

v3/pkg/application/window.go

@@ -84,4 +84,5 @@ type Window interface {
 	ZoomIn()
 	ZoomOut()
 	ZoomReset() Window
+	SetMenu(menu *Menu)
 }