How to ask user permission before closing MAUI APP?

Question

How to ask user permission before closing MAUI APP?

Lohith K K 110

I have read about the lifecycle events in maui and found the below:

#if WINDOWS              
events.AddWindows(windows => windows                     
.OnActivated((window, args) => LogEvent(nameof(WindowsLifecycle.OnActivated)))                     .OnClosed((window, args) => LogEvent(nameof(WindowsLifecycle.OnClosed)))                     .OnLaunched((window, args) => LogEvent(nameof(WindowsLifecycle.OnLaunched)))                     .OnLaunching((window, args) => LogEvent(nameof(WindowsLifecycle.OnLaunching)))                     .OnVisibilityChanged((window, args) => LogEvent(nameof(WindowsLifecycle.OnVisibilityChanged)))                     .OnPlatformMessage((window, args) =>
{
	 if (args.MessageId == Convert.ToUInt32("031A", 16))
     {
	   / System theme has changed
     }                     
})); 
#endif
static bool LogEvent(string eventName, string type = null)
{
	System.Diagnostics.Debug.WriteLine($"Lifecycle event: {eventName}{(type == null ? string.Empty : $" ({type})")}");                  
return true;              
}          
});

What I want is, when the user clicks on the close or X button of the window I want to show a display alert asking do you want to close or not?
The button as below:

User's image

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Answer 1

Anonymous

Hello,

What I want is, when the user clicks on the close or X button of the window I want to show a display alert asking do you want to close or not?

You can do this by adding a window close event to appwindow in the windowsLifecycleBuilder. When the user executes the closing method, we can push a display alert. If the user clicks Yes, close this application; if they click the Cancel, the display alert will dismiss. Here is a simple code that you can refer to.

#if WINDOWS
events.AddWindows(windowsLifecycleBuilder =>
{
    windowsLifecycleBuilder.OnWindowCreated(window =>
    {
        //use Microsoft.UI.Windowing functions for window
        var handle = WinRT.Interop.WindowNative.GetWindowHandle(window);
        var id = Microsoft.UI.Win32Interop.GetWindowIdFromWindow(handle);
        var appWindow = Microsoft.UI.Windowing.AppWindow.GetFromWindowId(id);

        //When user execute the closing method, we can push a display alert. If user click Yes, close this application, if click the cancel, display alert will dismiss.
        appWindow.Closing += async (s, e) => 
        {
            e.Cancel = true;
            bool result = await App.Current.MainPage.DisplayAlert(
                "Alert title", 
                "You sure want to close app?", 
                "Yes", 
                "Cancel");

            if (result)
            {
                App.Current.Quit();
            }
        };
    });
});
#endif

Best Regards,

Leon Lu

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Lohith K K 110 Reputation points

2023-07-06T07:31:32.8533333+00:00

Thanks for the answer.

Can you suggest me on where I need to add this code?

Anonymous

Sure, please open the MauiProgram.cs, find the CreateMauiApp() method, add ConfigureLifecycleEvents method by builder property, then add above code in the ConfigureLifecycleEvents, here is my code in MauiProgram.cs.

public static class MauiProgram
{
	public static MauiApp CreateMauiApp()
	{
		var builder = MauiApp.CreateBuilder();
		builder
			.UseMauiApp<App>()
			.ConfigureLifecycleEvents(events =>
			{

//add here 

#if WINDOWS
events.AddWindows(windowsLifecycleBuilder =>
{
    windowsLifecycleBuilder.OnWindowCreated(window =>
    {        
        var handle = WinRT.Interop.WindowNative.GetWindowHandle(window);
        var id = Microsoft.UI.Win32Interop.GetWindowIdFromWindow(handle);
        var appWindow = Microsoft.UI.Windowing.AppWindow.GetFromWindowId(id);      
        appWindow.Closing += async (s, e) => 
        {
            e.Cancel = true;
            bool result = await App.Current.MainPage.DisplayAlert(
                "Alert title", 
                "Do you want to close app?", 
                "Yes", 
                "Cancel");

            if (result)
            {
                App.Current.Quit();
            }
        };
    });
});
#endif

            })
			.ConfigureFonts(fonts =>
			{
				fonts.AddFont("OpenSans-Regular.ttf", "OpenSansRegular");
				fonts.AddFont("OpenSans-Semibold.ttf", "OpenSansSemibold");
			});

#if DEBUG
		builder.Logging.AddDebug();
#endif

		return builder.Build();
	}
}

Anonymous

2023-07-07T02:06:41.87+00:00

Lohith K K May I know whether your issue has been solved or not? If you're still having problems, please explain in detail what is still going wrong and what you need help with.
Lohith K K 110 Reputation points

2023-07-07T04:37:57.7933333+00:00

Thank You Leon Lu
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How to ask user permission before closing MAUI APP?

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