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

namespace BuzzGUI.Common
{
	public class MachineGUIUpdateTimer
	{
		const int UpdateInterval = 20;	// TODO: -> general settings

		DispatcherTimer timer;

		public MachineGUIUpdateTimer(UIElement gui, Action update)
		{
			gui.IsVisibleChanged += (sender, e) =>
			{
				if (gui.IsVisible && timer == null)
				{
					timer = new DispatcherTimer();
					timer.Interval = TimeSpan.FromMilliseconds(UpdateInterval);
					timer.Tick += (sender2, e2) => { update(); };
					timer.Start();
				}
				else if (!gui.IsVisible && timer != null)
				{
					timer.Stop();
					timer = null;
				}
			};

		}
	}
}