CenterScreen in Windows For .NET MAUI

Question

Hello, I don't know how I can make the windowstartuplocation centerscreen function in .net maui

Answer 1

Hello,

Window.WindowStartupLocation is a method in WPF, MAUI for windows platform based on the WINUI 3, if you want to implement it, you can get the appwindow and calculate the center position of screen, then move your screen to this position in the MauiProgram.cs.

You can refer to the following code.

public static class MauiProgram
{
    public static MauiApp CreateMauiApp()
    {
        var builder = MauiApp.CreateBuilder();
        builder
            .UseMauiApp<App>()
            .ConfigureFonts(fonts =>
            {
                fonts.AddFont("OpenSans-Regular.ttf", "OpenSansRegular");
                fonts.AddFont("OpenSans-Semibold.ttf", "OpenSansSemibold");
            });

 // add following code

#if WINDOWS
        builder.ConfigureLifecycleEvents(events =>
        {
            // Make sure to add "using Microsoft.Maui.LifecycleEvents;" in the top of the file
            events.AddWindows(windowsLifecycleBuilder =>
            {
                windowsLifecycleBuilder.OnWindowCreated(window =>
                {
                    window.ExtendsContentIntoTitleBar = false;
                    var handle = WinRT.Interop.WindowNative.GetWindowHandle(window);
                    var id = Microsoft.UI.Win32Interop.GetWindowIdFromWindow(handle);
                    var appWindow = Microsoft.UI.Windowing.AppWindow.GetFromWindowId(id);

                   if (appWindow is not null)
                    {
                        Microsoft.UI.Windowing.DisplayArea displayArea = Microsoft.UI.Windowing.DisplayArea.GetFromWindowId(id, Microsoft.UI.Windowing.DisplayAreaFallback.Nearest);
                        if (displayArea is not null)
                        {
                            var CenteredPosition = appWindow.Position;
                            CenteredPosition.X = ((displayArea.WorkArea.Width - appWindow.Size.Width) / 2);
                            CenteredPosition.Y = ((displayArea.WorkArea.Height - appWindow.Size.Height) / 2);
                            appWindow.Move(CenteredPosition);
                        }
                    }
                });
            });
        });
#endif
        return builder.Build();
    }
}

Best Regards,

Leon Lu

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