ryujinx/src/Ryujinx/UI/Controls/ApplicationGridView.axaml.cs

using Avalonia.Controls;
using Avalonia.Input;
using Avalonia.Interactivity;
using Ryujinx.Ava.UI.Helpers;
using Ryujinx.Ava.UI.ViewModels;
using Ryujinx.Ava.Utilities.AppLibrary;
using System;

namespace Ryujinx.Ava.UI.Controls
{
    public partial class ApplicationGridView : UserControl
    {
        public static readonly RoutedEvent<ApplicationOpenedEventArgs> ApplicationOpenedEvent =
            RoutedEvent.Register<ApplicationGridView, ApplicationOpenedEventArgs>(nameof(ApplicationOpened), RoutingStrategies.Bubble);

        public event EventHandler<ApplicationOpenedEventArgs> ApplicationOpened
        {
            add => AddHandler(ApplicationOpenedEvent, value);
            remove => RemoveHandler(ApplicationOpenedEvent, value);
        }

        public ApplicationGridView() => InitializeComponent();

        public void GameList_DoubleTapped(object sender, TappedEventArgs args)
        {
            if (sender is ListBox { SelectedItem: ApplicationData selected })
                RaiseEvent(new ApplicationOpenedEventArgs(selected, ApplicationOpenedEvent));
        }

        public void GameList_SelectionChanged(object sender, SelectionChangedEventArgs args)
        {
            if (DataContext is MainWindowViewModel viewModel && sender is ListBox { SelectedItem: ApplicationData selected })
                viewModel.GridSelectedApplication = selected;
        }
    }
}