How to use AppWindow

[ArchieCoder]

In the blog post of 5.4.5 https://platform.uno/blog/5-4/#:~:text=September%2026,%202024.%20We%20are%20introducing%20over%20290%20new%20additions, there is a mention of New AppWindow APIs to get/set the position and size as well as move, resize and show/hide windows of the app.

AppWindow does not compile in Skia.

Regarding WinUI, it does not work with the code below. WinUIEx by @dotMorten works.

public MainPage()
{
    InitializeComponent();

    Loaded += MainPage_Loaded;
    Unloaded += MainPage_Unloaded;
}

private void MainPage_Loaded(object sender, RoutedEventArgs e)
{
    _appWindow = AppWindow.Create();

    RestoreWindowPosition();
}

private void MainPage_Unloaded(object sender, RoutedEventArgs e)
{
    SaveWindowPosition();
}

private void SaveWindowPosition()
{
    var settings = ApplicationData.Current.LocalSettings;
    settings.Values["WindowWidth"] = _appWindow.Size.Width;
    settings.Values["WindowHeight"] = _appWindow.Size.Height;
    settings.Values["WindowX"] = _appWindow.Position.X;
    settings.Values["WindowY"] = _appWindow.Position.Y;
}

private void RestoreWindowPosition()
{
    var settings = ApplicationData.Current.LocalSettings;

    if (settings.Values.TryGetValue("WindowWidth", out var width) &&
        settings.Values.TryGetValue("WindowHeight", out var height) &&
        settings.Values.TryGetValue("WindowX", out var x) &&
        settings.Values.TryGetValue("WindowY", out var y))
    {
        var size = new SizeInt32 { Width = (int)width, Height = (int)height };
        var position = new PointInt32 { X = (int)x, Y = (int)y };
        _appWindow.Resize(size);
        _appWindow.Move(position);
    }
}

[MartinZikmund]

@ArchieCoder the AppWindow.Create() method is not implemented yet, instead you can create a XAML Microsoft.UI.Xaml.Window and then use its AppWindow property, e.g.:

var window = new Window();
window.AppWindow.SetPresenter(...);

To access the main (primary) window of your app, you can make the Window instance in App.xaml.cs accessible as a public property for example

[ArchieCoder]

The full screen state does not seem to work when restoring the window presenter or I am probably missing something. I created a sample project where you can see the behavior.

UnoAppWindow.zip

Window.mp4

` MainWindow = builder.Window;
MainWindow.Closed += OnMainWindowClosed;
RestoreWindowPosition();

#if DEBUG
MainWindow.EnableHotReload();
#endif
MainWindow.SetWindowIcon();

    Host = await builder.NavigateAsync<Shell>();
}

private void OnMainWindowClosed(object sender, WindowEventArgs args)
{
    SaveWindowPosition();
}

private void SaveWindowPosition()
{
    var settings = ApplicationData.Current.LocalSettings;
    settings.Values["WindowWidth"] = MainWindow!.AppWindow.Size.Width;
    settings.Values["WindowHeight"] = MainWindow.AppWindow.Size.Height;
    settings.Values["WindowX"] = MainWindow.AppWindow.Position.X;
    settings.Values["WindowY"] = MainWindow.AppWindow.Position.Y;
    settings.Values["Presenter"] = (int)MainWindow.AppWindow.Presenter.Kind;
}

private void RestoreWindowPosition()
{
    var settings = ApplicationData.Current.LocalSettings;

    if (settings.Values.TryGetValue("WindowWidth", out var width) &&
        settings.Values.TryGetValue("WindowHeight", out var height) &&
        settings.Values.TryGetValue("WindowX", out var x) &&
        settings.Values.TryGetValue("WindowY", out var y) &&
        settings.Values.TryGetValue("Presenter", out var p))
    {
        var size = new SizeInt32 { Width = (int)width, Height = (int)height };
        var position = new PointInt32 { X = (int)x, Y = (int)y };

        MainWindow!.AppWindow.Resize(size);
        MainWindow.AppWindow.Move(position);
        MainWindow.AppWindow.SetPresenter((AppWindowPresenterKind)p);
    }
}`

[dotMorten]

@ArchieCoder careful with the code above. If your monitor layout changes your window could end up off-screen. Winuiex handles that and only restores for last known layout

[ArchieCoder]

Thanks for the hint. You convinced me to keep your library for WinUI. I do need something for Skia.