MVUX and C# Markup getting fullscreen using a button

[emem67]

I'm experimenting as in the subject and I managed to get in fullscreen in WASM and in a native windows application.
I have not found a way for Desktop application (Skia) in windows envinroment.
To get fullscreen in WASM I used this:

    // Works for WASM not for Desktop
    Windows.UI.ViewManagement.ApplicationView.GetForCurrentView().TryEnterFullScreenMode();

To do the same in native windows:

    // Works with WinApp not for Desktop  
    var app = Application.Current as App;  
    app.Presenter.Maximize();  

note I had to add a Presenter property in the App class

    public OverlappedPresenter Presenter { get; private set; }
    
    // Later in the OnLaunched
    // Set up for WinApp
    Presenter = (OverlappedPresenter)MainWindow.AppWindow.Presenter;

I created a small app to illustrate the concepts.
FullScreen.zip

I would like to do the same for the Desktop application in windows enviroment but I have not fond a way, any suggestion?
Thanks

[mcNets]

I'm using this code to maximize a desktop app in my linux device:

if (Environment.OSVersion.Platform == PlatformID.Unix) {
    ApplicationView.GetForCurrentView().TryEnterFullScreenMode();
}

[emem67]

Uh, then I do not know what to think.
As you can see here I have 'System.InvalidOperationException' in WindowsBase.dll (Desktop on Windows)

Maybe the issue is I'm tring to resize the main window and I have not created a second windows and the nresize it.
thanks anyway

[mcNets]

I'm maximazing it just after the activation.

[emem67]

I see, if I do this in the App.xaml.cs after the MainWindow.Activate(); it works.
If I do this from my page it doesent even if I create a property in the aa class like this

public ApplicationView AppView { get; private set; }

then this code

        
        // Ensure the current window is active
        MainWindow.Activate();

        AppView = ApplicationView.GetForCurrentView();

if in my page I do this I still have the problem

        var app = Application.Current as App;
        app.AppView.TryEnterFullScreenMode();

[mcNets]

Are you getting a log error msg?

https://github.com/unoplatform/uno/blob/master/src/Uno.UI.Runtime.Skia.Gtk/Extensions/GtkApplicationViewExtension.cs

[emem67]

Sorry I'm not sure on where to look for logs, in the bin/debug folder there is anything.
Could you try my application? It is the zip file I uploaded earlier.

[mcNets]

@emem67 Try this:

1- Add a Maximize() method to the Application class: (I would move the logic for all TFM here.)

public void MaximizeWindow()
{
    var appWindow = MainWindow?.AppWindow ?? throw new InvalidOperationException("AppWindow is null");

    MainWindow?.DispatcherQueue.TryEnqueue(() =>
    {
        if (appWindow.Presenter is FullScreenPresenter)
        {
            appWindow.SetPresenter(AppWindowPresenterKind.Overlapped);
        }
        else
        {
            appWindow.SetPresenter(AppWindowPresenterKind.FullScreen);
        }
    });
}

2- Change the ViewModel

#if HAS_UNO_SKIA
        var app = Application.Current as App;
        app?.Maximize();

[emem67]

Wow you are on another legue :-)
What you wrote works not only for Skia desktop but for WASM too!
ApplicationView.GetForCurrentView() still fails for native windows so I added my previous code to the Maximize method.
I tried to understand the concept of sending messges to the DispatcherQueue from anothet thread but I got lost.
I suspect the DispatcherQueue can work also for native windows but it is too much for me.
So your function become like this:

#if HAS_UNO
        var appWindow = MainWindow?.AppWindow ?? throw new InvalidOperationException("AppWindow is null");
        MainWindow?.DispatcherQueue.TryEnqueue(() =>
        {
            if (appWindow.Presenter is FullScreenPresenter)
            {
                appWindow.SetPresenter(AppWindowPresenterKind.Overlapped);
            }
            else
            {
                appWindow.SetPresenter(AppWindowPresenterKind.FullScreen);
            }
        });
#else
        if(Presenter.State == OverlappedPresenterState.Maximized)
        {
            Presenter.Restore();
        }
        else
        {
            Presenter.Maximize();
        }
#endif

off course I have to create a variable for the presenter in the App class

private OverlappedPresenter Presenter { get; set; }

and set it at the end of the OnLaunched method

Presenter = (OverlappedPresenter)MainWindow.AppWindow.Presenter;

BTW I consider your suggertion the answer to this thread
many many thanks!

[mcNets]

You can get the Presenter within the Maximize function too, like appView

[MartinZikmund]

@emem67 @mcNets I notice you are using ApplicationView in case of Uno, however AppWindow presenters should now be supported on Uno as well, and actually should be more reliable than using ApplicationView which is officialy deprecated in WinUI - so try using FullScreenPresenter for the AppWindow if possible

[mcNets]

@MartinZikmund changed.

[emem67]

I also update my code snippet that includes the native windows part, thanks!