.NET Maui Min Max Hide Not Showing

Question

I'm not seeing my Min, Max and Hide buttons when my screen is maxed. I have set the following

window.ExtendsContentIntoTitleBar = true;

Here is the code I'm using .

   builder.ConfigureLifecycleEvents(events =>
         {
#if WINDOWS
             events.AddWindows(w =>
             {
                 w.OnWindowCreated(window =>
                 {
                     window.ExtendsContentIntoTitleBar = true; //If you need to completely hide the minimized maximized close button, you need to set this value to false.
                     IntPtr hWnd = WinRT.Interop.WindowNative.GetWindowHandle(window);
                     WindowId myWndId = Win32Interop.GetWindowIdFromWindow(hWnd);
                     var _appWindow = AppWindow.GetFromWindowId(myWndId);
                     _appWindow.SetPresenter(AppWindowPresenterKind.FullScreen);
                 });
             });
#endif
         });

Answer 1

FullScreen and Maximized are different states. You want your app to show maximized, which includes the title bar and its widgets, but your code is setting it to full screen, which doesn't show the title bar and its widgets.

To maximize the window when it's created (as in your code snippet) change this line:

_appWindow.SetPresenter(AppWindowPresenterKind.FullScreen);

To

// Overlapped is default state
(_appWindow.Presenter as OverlappedPresenter)?.Maximize();

Pulling that out into a function that can be called elsewhere (assumption: app has only one Window and is currently Overlapped):

#if WINDOWS
        public void MaximizeWindow()
        {
            var platformView = (MauiWinUIWindow)Application.Current.Windows[0].Handler.PlatformView;
            Microsoft.UI.Windowing.AppWindow? _appWindow = platformView.AppWindow;
            (_appWindow.Presenter as Microsoft.UI.Windowing.OverlappedPresenter)?.Maximize();
        }
#endif

For more on the difference between FullScreen and Maximized, see the FullScreenPresenter class documentation

Remarks Full-screen mode is not the same as maximized. When an app is in full-screen mode, it takes up the entirety of the screen. System elements, like title bars, status bars, or the taskbar, are hidden by default. The user can swipe from the bottom to invoke the taskbar, from the left to invoke Task View, from the right to invoke Action Center, and from the top to invoke the title bar.

When the user switches away from the app to use another app, the full-screen nature of the app is preserved. When the user switches to the app again, it is full-screen.