[examples] update label on click

v3/go.mod

@@ -3,6 +3,7 @@ module github.com/wailsapp/wails/v3
 go 1.19
 
 require (
+	github.com/ebitengine/purego v0.3.2
 	github.com/go-task/task/v3 v3.20.0
 	github.com/google/go-cmp v0.5.9
 	github.com/jackmordaunt/icns/v2 v2.2.1
@@ -72,3 +73,5 @@ require (
 )
 
 replace github.com/wailsapp/wails/v2 => ../v2
+
+replace github.com/ebitengine/purego v0.3.2 => github.com/TotallyGamerJet/purego v0.2.0-alpha.0.20230404174033-5655abccca7e

v3/go.sum

@@ -11,6 +11,8 @@ github.com/MarvinJWendt/testza v0.2.12/go.mod h1:JOIegYyV7rX+7VZ9r77L/eH6CfJHHzX
 github.com/MarvinJWendt/testza v0.3.0/go.mod h1:eFcL4I0idjtIx8P9C6KkAuLgATNKpX4/2oUqKc6bF2c=
 github.com/MarvinJWendt/testza v0.4.2/go.mod h1:mSdhXiKH8sg/gQehJ63bINcCKp7RtYewEjXsvsVUPbE=
 github.com/MarvinJWendt/testza v0.5.1 h1:a9Fqx6vQrHQ4CyiaLhktfTTelwGotmFWy8MNhyaohw8=
+github.com/TotallyGamerJet/purego v0.2.0-alpha.0.20230404174033-5655abccca7e h1:wQ7ot+e0mwJYkbomtIX9tU0dOV9lFTmwAgUGqvQTIUg=
+github.com/TotallyGamerJet/purego v0.2.0-alpha.0.20230404174033-5655abccca7e/go.mod h1:iIjxzd6CiRiOG0UyXP+V1+jWqUXVjPKLAI0mRfJZTmQ=
 github.com/atomicgo/cursor v0.0.1/go.mod h1:cBON2QmmrysudxNBFthvMtN32r3jxVRIvzkUiF/RuIk=
 github.com/containerd/console v1.0.3 h1:lIr7SlA5PxZyMV30bDW0MGbiOPXwc63yRuCP0ARubLw=
 github.com/containerd/console v1.0.3/go.mod h1:7LqA/THxQ86k76b8c/EMSiaJ3h1eZkMkXar0TQ1gf3U=

v3/pkg/application/application.go

@@ -363,6 +363,13 @@ func (a *App) Run() error {
 		}
 	}()
 
+	a.impl.setApplicationMenu(a.ApplicationMenu)
+
+	// set the application menu
+	if runtime.GOOS == "darwin" {
+		a.impl.setIcon(a.options.Icon)
+	}
+
 	// run windows
 	for _, window := range a.windows {
 		go window.run()
@@ -373,12 +380,6 @@ func (a *App) Run() error {
 		go systray.Run()
 	}
 
-	// set the application menu
-	if runtime.GOOS == "darwin" {
-		a.impl.setApplicationMenu(a.ApplicationMenu)
-		a.impl.setIcon(a.options.Icon)
-	}
-
 	err := a.impl.run()
 	if err != nil {
 		return err

v3/pkg/application/application_darwin.go

@@ -185,6 +185,7 @@ func (m *macosApp) run() error {
 		C.setApplicationShouldTerminateAfterLastWindowClosed(C.bool(m.parent.options.Mac.ApplicationShouldTerminateAfterLastWindowClosed))
 		C.setActivationPolicy(C.int(m.parent.options.Mac.ActivationPolicy))
 		C.activateIgnoringOtherApps()
+		globalApplication.activate()
 	})
 	// setup event listeners
 	for eventID := range m.parent.applicationEventListeners {

v3/pkg/application/messageprocessor_call.go

@@ -4,19 +4,16 @@ import (
 	"encoding/json"
 	"fmt"
 	"net/http"
-	"strconv"
 )
 
 func (m *MessageProcessor) callErrorCallback(window *WebviewWindow, message string, callID *string, err error) {
 	errorMsg := fmt.Sprintf(message, err)
 	m.Error(errorMsg)
-	msg := "_wails.callErrorCallback('" + *callID + "', " + strconv.Quote(errorMsg) + ");"
+	window.CallError(callID, errorMsg)
-	window.ExecJS(msg)
 }
 
 func (m *MessageProcessor) callCallback(window *WebviewWindow, callID *string, result string, isJSON bool) {
-	msg := fmt.Sprintf("_wails.callCallback('%s', %s, %v);", *callID, strconv.Quote(result), isJSON)
+	window.CallResponse(callID, result)
-	window.ExecJS(msg)
 }
 
 func (m *MessageProcessor) processCallMethod(method string, rw http.ResponseWriter, _ *http.Request, window *WebviewWindow, params QueryParams) {

v3/pkg/application/messageprocessor_dialog.go

@@ -5,19 +5,16 @@ import (
 	"fmt"
 	"net/http"
 	"runtime"
-	"strconv"
 )
 
 func (m *MessageProcessor) dialogErrorCallback(window *WebviewWindow, message string, dialogID *string, err error) {
 	errorMsg := fmt.Sprintf(message, err)
 	m.Error(errorMsg)
-	msg := "_wails.dialogErrorCallback('" + *dialogID + "', " + strconv.Quote(errorMsg) + ");"
+	window.DialogError(dialogID, errorMsg)
-	window.ExecJS(msg)
 }
 
 func (m *MessageProcessor) dialogCallback(window *WebviewWindow, dialogID *string, result string, isJSON bool) {
-	msg := fmt.Sprintf("_wails.dialogCallback('%s', %s, %v);", *dialogID, strconv.Quote(result), isJSON)
+	window.DialogResponse(dialogID, result)
-	window.ExecJS(msg)
 }
 
 func (m *MessageProcessor) processDialogMethod(method string, rw http.ResponseWriter, r *http.Request, window *WebviewWindow, params QueryParams) {

v3/pkg/application/webview_window.go

@@ -1,12 +1,14 @@
 package application
 
 import (
+	"encoding/json"
 	"errors"
 	"fmt"
-	"github.com/samber/lo"
 	"sync"
 	"time"
 
+	"github.com/samber/lo"
+
 	"github.com/wailsapp/wails/v3/pkg/logger"
 
 	"github.com/wailsapp/wails/v3/pkg/events"
@@ -14,54 +16,57 @@ import (
 
 type (
 	webviewWindowImpl interface {
-		setTitle(title string)
-		setSize(width, height int)
-		setAlwaysOnTop(alwaysOnTop bool)
-		setURL(url string)
-		setResizable(resizable bool)
-		setMinSize(width, height int)
-		setMaxSize(width, height int)
-		execJS(js string)
-		setBackgroundColour(color RGBA)
-		run()
 		center()
-		size() (int, int)
-		width() int
-		height() int
-		position() (int, int)
-		destroy()
-		reload()
-		forceReload()
-		toggleDevTools()
-		zoomReset()
-		zoomIn()
-		zoomOut()
-		getZoom() float64
-		setZoom(zoom float64)
 		close()
-		zoom()
+		destroy()
-		setHTML(html string)
+		disableSizeConstraints()
-		setPosition(x int, y int)
+		execJS(js string)
-		on(eventID uint)
+		focus()
-		minimise()
+		forceReload()
-		unminimise()
-		maximise()
-		unmaximise()
 		fullscreen()
-		unfullscreen()
+		getScreen() (*Screen, error)
-		isMinimised() bool
+		getZoom() float64
-		isMaximised() bool
+		height() int
+		hide()
+		hide()
 		isFullscreen() bool
+		isMaximised() bool
+		isMinimised() bool
 		isNormal() bool
 		isVisible() bool
-		setFullscreenButtonEnabled(enabled bool)
+		maximise()
-		focus()
+		minimise()
-		show()
-		hide()
-		getScreen() (*Screen, error)
-		setFrameless(bool)
-		openContextMenu(menu *Menu, data *ContextMenuData)
 		nativeWindowHandle() uintptr
+		on(eventID uint)
+		openContextMenu(menu *Menu, data *ContextMenuData)
+		position() (int, int)
+		reload()
+		restore() // FIXME: not used
+		run()
+		setAlwaysOnTop(alwaysOnTop bool)
+		setBackgroundColour(color RGBA)
+		setFrameless(bool)
+		setFullscreenButtonEnabled(enabled bool)
+		setHTML(html string)
+		setMaxSize(width, height int)
+		setMinSize(width, height int)
+		setPosition(x int, y int)
+		setResizable(resizable bool)
+		setSize(width, height int)
+		setTitle(title string)
+		setURL(url string)
+		setZoom(zoom float64)
+		show()
+		size() (int, int)
+		toggleDevTools()
+		unfullscreen()
+		unmaximise()
+		unminimise()
+		width() int
+		zoom()
+		zoomIn()
+		zoomOut()
+		zoomReset()
 	}
 )
 
@@ -131,6 +136,39 @@ func (w *WebviewWindow) addCancellationFunction(canceller func()) {
 	w.cancellers = append(w.cancellers, canceller)
 }
 
+// formatJS ensures the 'data' provided marshals to valid json or panics
+func (w *WebviewWindow) formatJS(f string, callID string, data string) string {
+	j, err := json.Marshal(data)
+	if err != nil {
+		panic(err)
+	}
+	return fmt.Sprintf(f, callID, j)
+}
+
+func (w *WebviewWindow) CallError(callID *string, result string) {
+	if w.impl != nil {
+		w.impl.execJS(w.formatJS("_wails.callErrorCallback('%s', %s);", *callID, result))
+	}
+}
+
+func (w *WebviewWindow) CallResponse(callID *string, result string) {
+	if w.impl != nil {
+		w.impl.execJS(w.formatJS("_wails.callCallback('%s', %s, true);", *callID, result))
+	}
+}
+
+func (w *WebviewWindow) DialogError(dialogID *string, result string) {
+	if w.impl != nil {
+		w.impl.execJS(w.formatJS("_wails.dialogErrorCallback('%s', %s);", *dialogID, result))
+	}
+}
+
+func (w *WebviewWindow) DialogResponse(dialogID *string, result string) {
+	if w.impl != nil {
+		w.impl.execJS(w.formatJS("_wails.dialogCallback('%s', %s, true);", *dialogID, result))
+	}
+}
+
 // SetTitle sets the title of the window
 func (w *WebviewWindow) SetTitle(title string) *WebviewWindow {
 	w.implLock.RLock()
@@ -744,8 +782,9 @@ func (w *WebviewWindow) SetFrameless(frameless bool) *WebviewWindow {
 }
 
 func (w *WebviewWindow) dispatchWailsEvent(event *WailsEvent) {
-	msg := fmt.Sprintf("_wails.dispatchWailsEvent(%s);", event.ToJSON())
+	if w.impl != nil {
-	w.ExecJS(msg)
+		w.impl.execJS(fmt.Sprintf("_wails.dispatchWailsEvent(%s);", event.ToJSON()))
+	}
 }
 
 func (w *WebviewWindow) info(message string, args ...any) {