[v3 windows] Add WebviewWindow.Print()

v3/examples/window/main.go

@@ -294,6 +294,14 @@ func main() {
 			app.InfoDialog().SetTitle(fmt.Sprintf("Screen %s", screen.ID)).SetMessage(msg).Show()
 		})
 	})
+
+	printMenu := menu.AddSubmenu("Print")
+	printMenu.Add("Print").OnClick(func(ctx *application.Context) {
+		currentWindow(func(w *application.WebviewWindow) {
+			_ = w.Print()
+		})
+	})
+
 	app.NewWebviewWindowWithOptions(application.WebviewWindowOptions{
 		Mac: application.MacWindow{
 			DisableShadow: true,

v3/pkg/application/webview_window.go

@@ -65,6 +65,7 @@ type (
 		nativeWindowHandle() uintptr
 		startDrag() error
 		startResize(border string) error
+		print() error
 	}
 )
 
@@ -889,3 +890,10 @@ func (w *WebviewWindow) startDrag() error {
 	}
 	return invokeSyncWithError(w.impl.startDrag)
 }
+
+func (w *WebviewWindow) Print() error {
+	if w.impl == nil {
+		return nil
+	}
+	return invokeSyncWithError(w.impl.print)
+}

v3/pkg/application/webview_window_windows.go

@@ -62,6 +62,11 @@ type windowsWebviewWindow struct {
 	resizeBorderHeight int32
 }
 
+func (w *windowsWebviewWindow) print() error {
+	w.execJS("window.print();")
+	return nil
+}
+
 func (w *windowsWebviewWindow) startResize(border string) error {
 	if !w32.ReleaseCapture() {
 		return fmt.Errorf("unable to release mouse capture")