[windows-x] Support events

v2/internal/appng/app.go

@@ -31,7 +31,11 @@ type App struct {
 }
 
 func (a *App) Run() error {
-	return a.frontend.Run(a.ctx)
+	err := a.frontend.Run(a.ctx)
+	if a.shutdownCallback != nil {
+		a.shutdownCallback()
+	}
+	return err
 }
 
 // CreateApp creates the app!

v2/internal/frontend/windows/frontend.go

@@ -65,7 +65,7 @@ func (f *Frontend) Run(ctx context.Context) error {
 		f.frontendOptions.Startup(ctx)
 	}()
 
-	winc.RunMainLoop()
+	mainWindow.Run()
 	return nil
 }
 
@@ -169,18 +169,18 @@ type EventNotify struct {
 }
 
 func (f *Frontend) Notify(name string, data ...interface{}) {
-	runtime.LockOSThread()
 	notification := EventNotify{
 		Name: name,
 		Data: data,
 	}
-	_, err := json.Marshal(notification)
+	payload, err := json.Marshal(notification)
 	if err != nil {
 		f.logger.Error(err.Error())
 		return
 	}
-	f.chromium.Eval(`alert("test");`)
+	f.mainWindow.Dispatch(func() {
-	//f.chromium.Eval(`window.wails.EventsNotify('` + string(payload) + `');`)
+		f.chromium.Eval(`window.wails.EventsNotify('` + string(payload) + `');`)
+	})
 }
 
 func (f *Frontend) processRequest(req *edge.ICoreWebView2WebResourceRequest, args *edge.ICoreWebView2WebResourceRequestedEventArgs) {

v2/internal/frontend/windows/window.go

@@ -5,12 +5,15 @@ import (
 	"github.com/tadvi/winc/w32"
 	"github.com/wailsapp/wails/v2/pkg/menu"
 	"github.com/wailsapp/wails/v2/pkg/options"
+	"sync"
 )
 
 type Window struct {
 	winc.Form
 	frontendOptions *options.App
 	applicationMenu *menu.Menu
+	m               sync.Mutex
+	dispatchq       []func()
 }
 
 func NewWindow(parent winc.Controller, options *options.App) *Window {
@@ -70,3 +73,34 @@ func NewWindow(parent winc.Controller, options *options.App) *Window {
 
 	return result
 }
+
+func (w *Window) Run() int {
+	var m w32.MSG
+
+	for w32.GetMessage(&m, 0, 0, 0) != 0 {
+		if m.Message == w32.WM_APP {
+			// Credit: https://github.com/jchv/go-webview2
+			w.m.Lock()
+			q := append([]func(){}, w.dispatchq...)
+			w.dispatchq = []func(){}
+			w.m.Unlock()
+			for _, v := range q {
+				v()
+			}
+		}
+		if !w.PreTranslateMessage(&m) {
+			w32.TranslateMessage(&m)
+			w32.DispatchMessage(&m)
+		}
+	}
+
+	w32.GdiplusShutdown()
+	return int(m.WParam)
+}
+
+func (w *Window) Dispatch(f func()) {
+	w.m.Lock()
+	w.dispatchq = append(w.dispatchq, f)
+	w.m.Unlock()
+	w32.PostMainThreadMessage(w32.WM_APP, 0, 0)
+}