Reduce flicker.

v3/examples/systray-custom/main.go

@@ -2,15 +2,20 @@ package main
 
 import (
 	_ "embed"
+	"github.com/wailsapp/wails/v3/pkg/application"
 	"github.com/wailsapp/wails/v3/pkg/events"
+	"github.com/wailsapp/wails/v3/pkg/icons"
 	"log"
 	"runtime"
-
-	"github.com/wailsapp/wails/v3/pkg/application"
-	"github.com/wailsapp/wails/v3/pkg/icons"
 )
 
-func createWindow(app *application.App) *application.WebviewWindow {
+var windowShowing bool
+
+func createWindow(app *application.App) {
+	if windowShowing {
+		return
+	}
+	// Log the time taken to create the window
 	window := app.NewWebviewWindowWithOptions(application.WebviewWindowOptions{
 		Width:            500,
 		Height:           500,
@@ -23,12 +28,13 @@ func createWindow(app *application.App) *application.WebviewWindow {
 			HiddenOnTaskbar: true,
 		},
 	})
+	windowShowing = true
 
 	window.OnWindowEvent(events.Common.WindowClosing, func(e *application.WindowEvent) {
-		println("Window Closing")
+		windowShowing = false
 	})
 
-	return window
+	window.Show()
 }
 
 func main() {
@@ -45,7 +51,6 @@ func main() {
 	})
 
 	systemTray := app.NewSystemTray()
-	window := createWindow(app)
 	menu := app.NewMenu()
 	menu.Add("Quit").OnClick(func(data *application.Context) {
 		app.Quit()
@@ -57,12 +62,9 @@ func main() {
 	}
 
 	systemTray.OnClick(func() {
-		println("Creating New Window!")
-		createWindow(app).Show()
+		createWindow(app)
 	})
 
-	systemTray.AttachWindow(window).WindowOffset(5)
-
 	err := app.Run()
 	if err != nil {
 		log.Fatal(err)

v3/pkg/application/logger_dev_windows.go

@@ -13,7 +13,7 @@ import (
 
 func DefaultLogger(level slog.Level) *slog.Logger {
 	return slog.New(tint.NewHandler(colorable.NewColorable(os.Stderr), &tint.Options{
-		TimeFormat: time.Kitchen,
+		TimeFormat: time.StampMilli,
 		NoColor:    !isatty.IsTerminal(os.Stderr.Fd()),
 		Level:      level,
 	}))

v3/pkg/application/webview_window.go

@@ -254,7 +254,7 @@ func NewWindow(options WebviewWindowOptions) *WebviewWindow {
 	// Listen for window closing events and de
 	result.OnWindowEvent(events.Common.WindowClosing, func(event *WindowEvent) {
 		result.unconditionallyClose = true
-		result.markAsDestroyed()
+		InvokeSync(result.markAsDestroyed)
 		InvokeSync(result.impl.close)
 		globalApplication.deleteWindowByID(result.id)
 	})
@@ -417,6 +417,7 @@ func (w *WebviewWindow) Show() Window {
 		InvokeSync(w.Run)
 		return w
 	}
+	w.options.Hidden = false
 	InvokeSync(w.impl.show)
 	return w
 }
@@ -434,7 +435,7 @@ func (w *WebviewWindow) SetURL(s string) Window {
 	url, _ := assetserver.GetStartURL(s)
 	w.options.URL = url
 	if w.impl != nil {
-		InvokeAsync(func() {
+		InvokeSync(func() {
 			w.impl.setURL(url)
 		})
 	}
@@ -452,7 +453,7 @@ func (w *WebviewWindow) GetBorderSizes() *LRTB {
 func (w *WebviewWindow) SetZoom(magnification float64) Window {
 	w.options.Zoom = magnification
 	if w.impl != nil {
-		InvokeAsync(func() {
+		InvokeSync(func() {
 			w.impl.setZoom(magnification)
 		})
 	}
@@ -471,7 +472,7 @@ func (w *WebviewWindow) GetZoom() float64 {
 func (w *WebviewWindow) SetResizable(b bool) Window {
 	w.options.DisableResize = !b
 	if w.impl != nil {
-		InvokeAsync(func() {
+		InvokeSync(func() {
 			w.impl.setResizable(b)
 		})
 	}
@@ -504,11 +505,11 @@ func (w *WebviewWindow) SetMinSize(minWidth, minHeight int) Window {
 	}
 	if w.impl != nil {
 		if newSize {
-			InvokeAsync(func() {
+			InvokeSync(func() {
 				w.impl.setSize(newWidth, newHeight)
 			})
 		}
-		InvokeAsync(func() {
+		InvokeSync(func() {
 			w.impl.setMinSize(minWidth, minHeight)
 		})
 	}
@@ -536,11 +537,11 @@ func (w *WebviewWindow) SetMaxSize(maxWidth, maxHeight int) Window {
 	}
 	if w.impl != nil {
 		if newSize {
-			InvokeAsync(func() {
+			InvokeSync(func() {
 				w.impl.setSize(newWidth, newHeight)
 			})
 		}
-		InvokeAsync(func() {
+		InvokeSync(func() {
 			w.impl.setMaxSize(maxWidth, maxHeight)
 		})
 	}
@@ -553,7 +554,7 @@ func (w *WebviewWindow) ExecJS(js string) {
 		return
 	}
 	if w.runtimeLoaded {
-		InvokeAsync(func() {
+		InvokeSync(func() {
 			w.impl.execJS(js)
 		})
 	} else {
@@ -569,7 +570,7 @@ func (w *WebviewWindow) Fullscreen() Window {
 	}
 	if !w.IsFullscreen() {
 		w.DisableSizeConstraints()
-		InvokeAsync(w.impl.fullscreen)
+		InvokeSync(w.impl.fullscreen)
 	}
 	return w
 }
@@ -577,7 +578,7 @@ func (w *WebviewWindow) Fullscreen() Window {
 func (w *WebviewWindow) SetMinimiseButtonState(state ButtonState) Window {
 	w.options.MinimiseButtonState = state
 	if w.impl != nil {
-		InvokeAsync(func() {
+		InvokeSync(func() {
 			w.impl.setMinimiseButtonState(state)
 		})
 	}
@@ -587,7 +588,7 @@ func (w *WebviewWindow) SetMinimiseButtonState(state ButtonState) Window {
 func (w *WebviewWindow) SetMaximiseButtonState(state ButtonState) Window {
 	w.options.MaximiseButtonState = state
 	if w.impl != nil {
-		InvokeAsync(func() {
+		InvokeSync(func() {
 			w.impl.setMaximiseButtonState(state)
 		})
 	}
@@ -597,7 +598,7 @@ func (w *WebviewWindow) SetMaximiseButtonState(state ButtonState) Window {
 func (w *WebviewWindow) SetCloseButtonState(state ButtonState) Window {
 	w.options.CloseButtonState = state
 	if w.impl != nil {
-		InvokeAsync(func() {
+		InvokeSync(func() {
 			w.impl.setCloseButtonState(state)
 		})
 	}
@@ -610,7 +611,7 @@ func (w *WebviewWindow) Flash(enabled bool) {
 	if w.impl == nil && !w.isDestroyed() {
 		return
 	}
-	InvokeAsync(func() {
+	InvokeSync(func() {
 		w.impl.flash(enabled)
 	})
 }
@@ -671,7 +672,7 @@ func (w *WebviewWindow) IsFullscreen() bool {
 func (w *WebviewWindow) SetBackgroundColour(colour RGBA) Window {
 	w.options.BackgroundColour = colour
 	if w.impl != nil {
-		InvokeAsync(func() {
+		InvokeSync(func() {
 			w.impl.setBackgroundColour(colour)
 		})
 	}
@@ -683,7 +684,7 @@ func (w *WebviewWindow) HandleMessage(message string) {
 	switch true {
 	case message == "wails:drag":
 		if !w.IsFullscreen() {
-			InvokeAsync(func() {
+			InvokeSync(func() {
 				err := w.startDrag()
 				if err != nil {
 					w.Error("Failed to start drag: %s", err)
@@ -729,7 +730,7 @@ func (w *WebviewWindow) Center() {
 		w.options.InitialPosition = WindowCentered
 		return
 	}
-	InvokeAsync(w.impl.center)
+	InvokeSync(w.impl.center)
 }
 
 // OnWindowEvent registers a callback for the given window event
@@ -849,7 +850,7 @@ func (w *WebviewWindow) SetBounds(bounds Rect) {
 	if w.impl == nil && !w.isDestroyed() {
 		return
 	}
-	InvokeAsync(func() {
+	InvokeSync(func() {
 		w.impl.setBounds(bounds)
 	})
 }
@@ -860,7 +861,7 @@ func (w *WebviewWindow) Position() (int, int) {
 		return 0, 0
 	}
 	var x, y int
-	InvokeAsync(func() {
+	InvokeSync(func() {
 		x, y = w.impl.position()
 	})
 	return x, y
@@ -871,7 +872,7 @@ func (w *WebviewWindow) SetPosition(x int, y int) {
 	if w.impl == nil && !w.isDestroyed() {
 		return
 	}
-	InvokeAsync(func() {
+	InvokeSync(func() {
 		w.impl.setPosition(x, y)
 	})
 }
@@ -934,7 +935,7 @@ func (w *WebviewWindow) ToggleFullscreen() {
 	if w.impl == nil && !w.isDestroyed() {
 		return
 	}
-	InvokeAsync(func() {
+	InvokeSync(func() {
 		if w.IsFullscreen() {
 			w.UnFullscreen()
 		} else {
@@ -948,7 +949,7 @@ func (w *WebviewWindow) ToggleMaximise() {
 	if w.impl == nil && !w.isDestroyed() {
 		return
 	}
-	InvokeAsync(func() {
+	InvokeSync(func() {
 		if w.IsMaximised() {
 			w.UnMaximise()
 		} else {
@@ -993,7 +994,7 @@ func (w *WebviewWindow) Close() {
 	if w.impl == nil && !w.isDestroyed() {
 		return
 	}
-	InvokeAsync(func() {
+	InvokeSync(func() {
 		w.emit(events.Common.WindowClosing)
 	})
 }
@@ -1182,7 +1183,7 @@ func (w *WebviewWindow) OpenContextMenu(data *ContextMenuData) {
 	if w.impl == nil && !w.isDestroyed() {
 		return
 	}
-	InvokeAsync(func() {
+	InvokeSync(func() {
 		w.impl.openContextMenu(menu, data)
 	})
 }

v3/pkg/application/webview_window_windows.go

@@ -59,7 +59,7 @@ type windowsWebviewWindow struct {
 
 	// Webview
 	chromium                   *edge.Chromium
-	hasStarted bool
+	webviewNavigationCompleted bool
 
 	// resizeBorder* is the width/height of the resize border in pixels.
 	resizeBorderWidth  int32
@@ -153,6 +153,7 @@ func (w *windowsWebviewWindow) setAlwaysOnTop(alwaysOnTop bool) {
 
 func (w *windowsWebviewWindow) setURL(url string) {
 	// Navigate to the given URL in the webview
+	w.webviewNavigationCompleted = false
 	w.chromium.Navigate(url)
 }
 
@@ -383,10 +384,6 @@ func (w *windowsWebviewWindow) run() {
 		w.chromium.Resize()
 	}
 
-	if !options.Hidden {
-		w.parent.Show()
-		w.update()
-	}
 }
 
 func (w *windowsWebviewWindow) center() {
@@ -871,8 +868,11 @@ func (w *windowsWebviewWindow) printStyle() {
 }
 
 func (w *windowsWebviewWindow) show() {
+	if w.webviewNavigationCompleted {
+		w.chromium.Show()
 		w32.ShowWindow(w.hwnd, w32.SW_SHOW)
 	}
+}
 
 func (w *windowsWebviewWindow) hide() {
 	w32.ShowWindow(w.hwnd, w32.SW_HIDE)
@@ -1667,6 +1667,7 @@ func (w *windowsWebviewWindow) setupChromium() {
 		if err != nil {
 			globalApplication.fatal(err.Error())
 		}
+		w.webviewNavigationCompleted = false
 		chromium.Navigate(startURL)
 	}
 
@@ -1709,12 +1710,12 @@ func (w *windowsWebviewWindow) navigationCompleted(sender *edge.ICoreWebView2, a
 	// EmitEvent DomReady ApplicationEvent
 	windowEvents <- &windowEvent{EventID: uint(events.Windows.WebViewNavigationCompleted), WindowID: w.parent.id}
 
-	if w.hasStarted {
+	if w.webviewNavigationCompleted {
 		// NavigationCompleted is triggered for every Load. If an application uses reloads the Hide/Show will trigger
 		// a flickering of the window with every reload. So we only do this once for the first NavigationCompleted.
 		return
 	}
-	w.hasStarted = true
+	w.webviewNavigationCompleted = true
 
 	wasFocused := w.isFocused()
 	// Hack to make it visible: https://github.com/MicrosoftEdge/WebView2Feedback/issues/1077#issuecomment-825375026
@@ -1729,9 +1730,10 @@ func (w *windowsWebviewWindow) navigationCompleted(sender *edge.ICoreWebView2, a
 	if wasFocused {
 		w.focus()
 	}
-
-	//f.mainWindow.hasBeenShown = true
-
+	if !w.parent.options.Hidden {
+		w.parent.Show()
+		w.update()
+	}
 }
 
 func (w *windowsWebviewWindow) processKeyBinding(vkey uint) bool {