[v3 windows] Add close handling: HideOnClose, QuitOnLastWindowClosed and DisableQuitOnLastWindowClosed

v3/STATUS.md

@@ -164,7 +164,7 @@ An 'X' indicates that the option is not supported by the platform.
 | AlwaysOnTop                     | Y       |       |     |                                            |
 | URL                             |         |       |     |                                            |
 | DisableResize                   | Y       |       |     |                                            |
-| Frameless                       |         |       |     |                                            |
+| Frameless                       | Y       |       |     |                                            |
 | MinWidth                        | Y       |       |     |                                            |
 | MinHeight                       | Y       |       |     |                                            |
 | MaxWidth                        | Y       |       |     |                                            |
@@ -178,7 +178,7 @@ An 'X' indicates that the option is not supported by the platform.
 | CSS                             |         |       |     |                                            |
 | X                               |         |       |     |                                            |
 | Y                               |         |       |     |                                            |
-| HideOnClose                     |         |       |     |                                            |
+| HideOnClose                     | Y       |       |     |                                            |
 | FullscreenButtonEnabled         |         |       |     |                                            |
 | Hidden                          | Y       |       |     |                                            |
 | EnableFraudulentWebsiteWarnings |         |       |     |                                            |

v3/pkg/application/application_windows.go

@@ -220,7 +220,7 @@ func (m *windowsApp) unregisterWindow(w *windowsWebviewWindow) {
 	delete(m.windowMap, w.hwnd)
 
 	// If this was the last window...
-	if len(m.windowMap) == 0 {
+	if len(m.windowMap) == 0 && !m.parent.options.Windows.DisableQuitOnLastWindowClosed {
 		w32.PostQuitMessage(0)
 	}
 }

v3/pkg/application/options_win.go

@@ -6,6 +6,9 @@ type WindowsApplicationOptions struct {
 	// If `shouldReturn` is `true` then `returnCode` will be returned by the main message loop.
 	// If `shouldReturn` is `false` then returnCode will be ignored and the message will be processed by the main message loop.
 	WndProcInterceptor func(hwnd uintptr, msg uint32, wParam, lParam uintptr) (returnCode uintptr, shouldReturn bool)
+
+	// DisableQuitOnLastWindowClosed disables the auto quit of the application if the last window has been closed.
+	DisableQuitOnLastWindowClosed bool
 }
 
 type BackdropType int32

v3/pkg/application/webview_window_windows.go

@@ -5,11 +5,12 @@ package application
 import (
 	"errors"
 	"fmt"
-	"github.com/samber/lo"
 	"strconv"
 	"unicode/utf16"
 	"unsafe"
 
+	"github.com/samber/lo"
+
 	"github.com/wailsapp/wails/v3/pkg/events"
 	"github.com/wailsapp/wails/v3/pkg/w32"
 )
@@ -609,11 +610,14 @@ func (w *windowsWebviewWindow) WndProc(msg uint32, wparam, lparam uintptr) uintp
 	case w32.WM_SIZE:
 		return 0
 	case w32.WM_CLOSE:
-		w32.PostMessage(w.hwnd, w32.WM_QUIT, 0, 0)
+		if w.parent.options.HideOnClose {
+			w.hide()
+			return 0 // Do not let the DefWindowProc allow to close us
+		}
+
 		// Unregister the window with the application
 		windowsApp := globalApplication.impl.(*windowsApp)
 		windowsApp.unregisterWindow(w)
-		return 0
 	case w32.WM_GETMINMAXINFO:
 		mmi := (*w32.MINMAXINFO)(unsafe.Pointer(lparam))
 		hasConstraints := false