How to specify window size for a MAUI application in case of Windows platform?-CodePudding

I'm working on a .NET MAUI app which I'd like to deploy on Windows beside Android.

My goal is to specify a minimal window width and a minimal window height only

affecting Windows as a platform.

My attempt to set the aforementioned properties inside App.xamls.cs:

public App()   
{
        InitializeComponent();

        Microsoft.Maui.Handlers.WindowHandler.WindowMapper[nameof(IWindow)] = (handler, view) =>
        {
#if WINDOWS
                    var nativeWindow = handler.NativeView;
                    nativeWindow.Activate();
                    IntPtr windowHandle = PInvoke.User32.GetActiveWindow();

                    PInvoke.User32.SetWindowPos(windowHandle, 
                    PInvoke.User32.SpecialWindowHandles.HWND_TOP,
                                        0, 0, width, height,  // width and height are ints
                                        PInvoke.User32.SetWindowPosFlags.SWP_NOMOVE);

#endif
        };
}

Unfortunately, it does not work as I'm receiveing the following error:

Error CS0117 'WindowHandler' does not contain a definition for 'WindowMapper

Any help is greatly appreciated!

CodePudding user response：

If you want to specify a minimal window width and a minimal window height only, you can make the project's target framwork as .net 7.0. And then override the App's CreateWindow method:

    protected override Window CreateWindow(IActivationState activationState)
      {
            var window = base.CreateWindow(activationState);
            window.MinimumHeight = 600; // set minimal window height
            window.MinimumWidth = 800; // set minimal window width
            return window;
      }

And you can also use the handler to resize the window. In the page.cs:

protected override void OnHandlerChanged()
      {
            base.OnHandlerChanged();
#if WINDOWS
            Microsoft.UI.Xaml.Window window = (Microsoft.UI.Xaml.Window)App.Current.Windows.First<Window>().Handler.PlatformView;
            IntPtr windowHandle = WinRT.Interop.WindowNative.GetWindowHandle(window);
            Microsoft.UI.WindowId windowId = Microsoft.UI.Win32Interop.GetWindowIdFromWindow(windowHandle);
            Microsoft.UI.Windowing.AppWindow appWindow = Microsoft.UI.Windowing.AppWindow.GetFromWindowId(windowId);
            appWindow.Resize(new Windows.Graphics.SizeInt32(800,600));
#endif
      }