Avalonia/src/Android/Avalonia.Android/AvaloniaView.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

using Android.App;
using Android.Content;
using Android.OS;
using Android.Runtime;
using Android.Views;
using Android.Widget;
using Avalonia.Android.Platform.SkiaPlatform;
using Avalonia.Controls;
using Avalonia.Controls.Embedding;
using Avalonia.Platform;

namespace Avalonia.Android
{
    public class AvaloniaView : FrameLayout
    {
        private readonly EmbeddableControlRoot _root;
        private readonly ViewImpl _view;

        public AvaloniaView(Context context) : base(context)
        {
            _view = new ViewImpl(context);
            AddView(_view.View);
            _root = new EmbeddableControlRoot(_view);
            _root.Prepare();
        }

        public object Content
        {
            get { return _root.Content; }
            set { _root.Content = value; }
        }

        public override bool DispatchKeyEvent(KeyEvent e)
        {
            return _view.View.DispatchKeyEvent(e);
        }

        class ViewImpl : TopLevelImpl, IEmbeddableWindowImpl
        {
            public event Action LostFocus;

            public ViewImpl(Context context) : base(context)
            {
                View.Focusable = true;
                View.FocusChange += ViewImpl_FocusChange;
            }

            private void ViewImpl_FocusChange(object sender, FocusChangeEventArgs e)
            {
                if(!e.HasFocus)
                    LostFocus?.Invoke();
            }

            protected override void OnResized(Size size)
            {
                MaxClientSize = size;
                base.OnResized(size);
            }

            public WindowState WindowState { get; set; }
            public IDisposable ShowDialog() => null;
        }
    }
}