Responsive Flyout in .NET MAUI

NET Multi-platform App UI (.NET MAUI) is a cross-platform framework for creating native mobile and desktop apps with C# and XAML. Using .NET MAUI, you can develop apps that can run on Android, iOS, macOS, and Windows from a single shared code-base. In this post, I will show you how to implement a responsive Flyout in your .NET MAUI app using Microsoft.Maui.Devices class by detecting when the screen size changes for iOS and Android.

Essentials

In .NET MAUI the Xamarin.Essentials were natively integrated, so you can get all the benefits along with improvements for the DeviceDisplay class.

Responsive Layout

In the ContentPage we attach an event handler to catch up screen size changes occurring to that particular page, so we render the proper Flyout behavior based on the screen size

    protected override void OnAppearing()
    {
        base.OnAppearing();
        SetFlyoutBehavior();
        DeviceDisplay.MainDisplayInfoChanged += DeviceDisplay_MainDisplayInfoChanged;
    }

    private void DeviceDisplay_MainDisplayInfoChanged(object sender, DisplayInfoChangedEventArgs e)
    {
        SetFlyoutBehavior();
    }

    protected override void OnDisappearing()
    {
        base.OnDisappearing();
        DeviceDisplay.MainDisplayInfoChanged -= DeviceDisplay_MainDisplayInfoChanged;
    }

    private void SetFlyoutBehavior()
    {
        // Get the screen points 
        double screenWidth = DeviceDisplay.MainDisplayInfo.Width / DeviceDisplay.MainDisplayInfo.Density;

        Debug.WriteLine(screenWidth);
        // sizes obtained from the official bootstrap CSS 
        switch (screenWidth)
        {
            case <= 576:
                Shell.Current.FlyoutBehavior = FlyoutBehavior.Flyout;
                Shell.Current.FlyoutIsPresented = false;
                break;
            case > 576:
                Shell.Current.FlyoutBehavior = FlyoutBehavior.Locked;
                Shell.Current.FlyoutIsPresented = true;
                break;
        }
    }

Conclusion

This is just a sample of how to set the Flyout from App Shell to be locked or hidden based on the screen size, however, you can use it to accommodate other areas of the screen layout.

I hope this helps others to create their own responsive layouts in .NET MAUI.