MessageBox.axaml.cs

// Yes its stoled from stackoverflow. Thanks kekekeks
using Avalonia.Controls;
using Avalonia.Markup.Xaml;

namespace FlaxPlugMan;
class MessageBox : Window
{
	public enum MessageBoxButtons
	{
		Ok,
		OkCancel,
		YesNo,
		YesNoCancel
	}

	public enum MessageBoxResult
	{
		Ok,
		Cancel,
		Yes,
		No
	}

	public MessageBox()
	{
		AvaloniaXamlLoader.Load(this);
	}

	public static Task<MessageBoxResult> Show(Window parent, string title, string text, MessageBoxButtons buttons = MessageBoxButtons.Ok)
	{
		var msgbox = new MessageBox()
		{
			Title = title
		};
		msgbox.FindControl<TextBlock>("Text").Text = text;
		var buttonPanel = msgbox.FindControl<StackPanel>("Buttons");

		var res = MessageBoxResult.Ok;

		void AddButton(string caption, MessageBoxResult r, bool def = false)
		{
			var btn = new Button {Content = caption};
			btn.Click += (_, __) => { 
				res = r;
				msgbox.Close();
			};
			buttonPanel.Children.Add(btn);
			if (def)
				res = r;
		}

		if (buttons == MessageBoxButtons.Ok || buttons == MessageBoxButtons.OkCancel)
			AddButton("Ok", MessageBoxResult.Ok, true);
		if (buttons == MessageBoxButtons.YesNo || buttons == MessageBoxButtons.YesNoCancel)
		{
			AddButton("Yes", MessageBoxResult.Yes);
			AddButton("No", MessageBoxResult.No, true);
		}

		if (buttons == MessageBoxButtons.OkCancel || buttons == MessageBoxButtons.YesNoCancel)
			AddButton("Cancel", MessageBoxResult.Cancel, true);

		var tcs = new TaskCompletionSource<MessageBoxResult>();
		msgbox.Closed += delegate { tcs.TrySetResult(res); };
		if (parent != null)
			msgbox.ShowDialog(parent);
		else msgbox.Show();
		return tcs.Task;
	}
}