Refactored application shutdown process to streamline app termination.

The application shutdown process has been significantly reworked to be more efficient and robust. The refactored code removes the event listener for the 'ApplicationTerminate' event. Instead, an in-process flag is added to the 'Quit' method to prevent recursive calls. Additionally, an optional 'OnShutdown' function variable is introduced to allow custom cleanup operations upon app termination.

v3/internal/runtime/desktop/@wailsio/runtime/src/event_types.js

@@ -177,6 +177,5 @@ export const EventTypes = {
 		WindowDPIChanged: "common:WindowDPIChanged",
 		WindowFilesDropped: "common:WindowFilesDropped",
 		ThemeChanged: "common:ThemeChanged",
-		ApplicationTerminate: "common:ApplicationTerminate",
 	},
 };

v3/internal/runtime/desktop/@wailsio/runtime/types/event_types.d.ts

@@ -177,6 +177,5 @@ export declare const EventTypes: {
 		WindowDPIChanged: string,
 		WindowFilesDropped: string,
 		ThemeChanged: string,
-		ApplicationTerminate: string,
 	},
 };

v3/pkg/application/application.go

@@ -122,11 +122,6 @@ func New(appOptions Options) *App {
 		result.keyBindings = processKeyBindingOptions(result.options.KeyBindings)
 	}
 
-	// Handle the terminate event
-	result.On(events.Common.ApplicationTerminate, func(e *Event) {
-		result.Quit()
-	})
-
 	return result
 }
 
@@ -291,8 +286,11 @@ type App struct {
 	// Keybindings
 	keyBindings map[string]func(window *WebviewWindow)
 
-	//
-	shutdownOnce sync.Once
+	// OnShutdown is called when the application is about to quit.
+	// This is useful for cleanup tasks.
+	// The shutdown process blocks until this function returns
+	OnShutdown         func()
+	performingShutdown bool
 }
 
 func (a *App) init() {
@@ -602,6 +600,13 @@ func (a *App) CurrentWindow() *WebviewWindow {
 }
 
 func (a *App) Quit() {
+	if a.performingShutdown {
+		return
+	}
+	a.performingShutdown = true
+	if a.OnShutdown != nil {
+		a.OnShutdown()
+	}
 	InvokeSync(func() {
 		a.windowsLock.RLock()
 		for _, window := range a.windows {

v3/pkg/events/events.go

@@ -6,52 +6,50 @@ type WindowEventType uint
 var Common = newCommonEvents()
 
 type commonEvents struct {
-	ApplicationStarted   ApplicationEventType
-	WindowMaximise       WindowEventType
-	WindowUnMaximise     WindowEventType
-	WindowFullscreen     WindowEventType
-	WindowUnFullscreen   WindowEventType
-	WindowRestore        WindowEventType
-	WindowMinimise       WindowEventType
-	WindowUnMinimise     WindowEventType
-	WindowClosing        WindowEventType
-	WindowZoom           WindowEventType
-	WindowZoomIn         WindowEventType
-	WindowZoomOut        WindowEventType
-	WindowZoomReset      WindowEventType
-	WindowFocus          WindowEventType
-	WindowLostFocus      WindowEventType
-	WindowShow           WindowEventType
-	WindowHide           WindowEventType
-	WindowDPIChanged     WindowEventType
-	WindowFilesDropped   WindowEventType
-	ThemeChanged         ApplicationEventType
-	ApplicationTerminate ApplicationEventType
+	ApplicationStarted ApplicationEventType
+	WindowMaximise     WindowEventType
+	WindowUnMaximise   WindowEventType
+	WindowFullscreen   WindowEventType
+	WindowUnFullscreen WindowEventType
+	WindowRestore      WindowEventType
+	WindowMinimise     WindowEventType
+	WindowUnMinimise   WindowEventType
+	WindowClosing      WindowEventType
+	WindowZoom         WindowEventType
+	WindowZoomIn       WindowEventType
+	WindowZoomOut      WindowEventType
+	WindowZoomReset    WindowEventType
+	WindowFocus        WindowEventType
+	WindowLostFocus    WindowEventType
+	WindowShow         WindowEventType
+	WindowHide         WindowEventType
+	WindowDPIChanged   WindowEventType
+	WindowFilesDropped WindowEventType
+	ThemeChanged       ApplicationEventType
 }
 
 func newCommonEvents() commonEvents {
 	return commonEvents{
-		ApplicationStarted:   1174,
-		WindowMaximise:       1175,
-		WindowUnMaximise:     1176,
-		WindowFullscreen:     1177,
-		WindowUnFullscreen:   1178,
-		WindowRestore:        1179,
-		WindowMinimise:       1180,
-		WindowUnMinimise:     1181,
-		WindowClosing:        1182,
-		WindowZoom:           1183,
-		WindowZoomIn:         1184,
-		WindowZoomOut:        1185,
-		WindowZoomReset:      1186,
-		WindowFocus:          1187,
-		WindowLostFocus:      1188,
-		WindowShow:           1189,
-		WindowHide:           1190,
-		WindowDPIChanged:     1191,
-		WindowFilesDropped:   1192,
-		ThemeChanged:         1193,
-		ApplicationTerminate: 1194,
+		ApplicationStarted: 1174,
+		WindowMaximise:     1175,
+		WindowUnMaximise:   1176,
+		WindowFullscreen:   1177,
+		WindowUnFullscreen: 1178,
+		WindowRestore:      1179,
+		WindowMinimise:     1180,
+		WindowUnMinimise:   1181,
+		WindowClosing:      1182,
+		WindowZoom:         1183,
+		WindowZoomIn:       1184,
+		WindowZoomOut:      1185,
+		WindowZoomReset:    1186,
+		WindowFocus:        1187,
+		WindowLostFocus:    1188,
+		WindowShow:         1189,
+		WindowHide:         1190,
+		WindowDPIChanged:   1191,
+		WindowFilesDropped: 1192,
+		ThemeChanged:       1193,
 	}
 }
 
@@ -560,5 +558,4 @@ var eventToJS = map[uint]string{
 	1191: "common:WindowDPIChanged",
 	1192: "common:WindowFilesDropped",
 	1193: "common:ThemeChanged",
-	1194: "common:ApplicationTerminate",
 }

v3/pkg/events/events.txt

@@ -167,5 +167,4 @@ common:WindowShow
 common:WindowHide
 common:WindowDPIChanged
 common:WindowFilesDropped
-common:ThemeChanged
-common:ApplicationTerminate
+common:ThemeChanged