moel@345: using System;
moel@345: using System.Collections.Generic;
moel@345: using System.Text;
moel@345: using System.Drawing;
moel@345: using System.Threading;
moel@345: using System.Windows.Forms;
moel@345: 
moel@345: namespace Aga.Controls.Tree.NodeControls
moel@345: {
moel@345: 	/// <summary>
moel@345: 	/// Displays an animated icon for those nodes, who are in expanding state. 
moel@345: 	/// Parent TreeView must have AsyncExpanding property set to true.
moel@345: 	/// </summary>
moel@345: 	public class ExpandingIcon: NodeControl
moel@345: 	{
moel@345: 		private static GifDecoder _gif = ResourceHelper.LoadingIcon;
moel@345: 		private static int _index = 0;
moel@345: 		private static volatile Thread _animatingThread;
moel@345:         private static object _lock = new object();
moel@345: 
moel@345: 		public override Size MeasureSize(TreeNodeAdv node, DrawContext context)
moel@345: 		{
moel@345: 			return ResourceHelper.LoadingIcon.FrameSize;
moel@345: 		}
moel@345: 
moel@345: 		protected override void OnIsVisibleValueNeeded(NodeControlValueEventArgs args)
moel@345: 		{
moel@345: 			args.Value = args.Node.IsExpandingNow;
moel@345: 			base.OnIsVisibleValueNeeded(args);
moel@345: 		}
moel@345: 
moel@345: 		public override void Draw(TreeNodeAdv node, DrawContext context)
moel@345: 		{
moel@345: 			Rectangle rect = GetBounds(node, context);
moel@345: 			Image img = _gif.GetFrame(_index).Image;
moel@345: 			context.Graphics.DrawImage(img, rect.Location);
moel@345: 		}
moel@345: 
moel@345: 		public static void Start()
moel@345: 		{
moel@345:             lock (_lock)
moel@345:             {
moel@345:                 if (_animatingThread == null)
moel@345:                 {
moel@345:                     _index = 0;
moel@345:                     _animatingThread = new Thread(new ThreadStart(IterateIcons));
moel@345:                     _animatingThread.IsBackground = true;
moel@345:                     _animatingThread.Priority = ThreadPriority.Lowest;
moel@345:                     _animatingThread.Start();
moel@345:                 }
moel@345:             }
moel@345: 		}
moel@345: 
moel@345:         public static void Stop()
moel@345:         {
moel@345:             lock (_lock)
moel@345:             {
moel@345:                 _index = 0;
moel@345:                 _animatingThread = null;
moel@345:             }
moel@345:         }
moel@345: 
moel@345: 		private static void IterateIcons()
moel@345: 		{
moel@345:             while (_animatingThread != null)
moel@345: 			{
moel@345: 				if (_index < _gif.FrameCount - 1)
moel@345: 					_index++;
moel@345: 				else
moel@345: 					_index = 0;
moel@345: 
moel@345: 				if (IconChanged != null)
moel@345: 					IconChanged(null, EventArgs.Empty);
moel@345: 
moel@345: 				int delay = _gif.GetFrame(_index).Delay;
moel@345: 				Thread.Sleep(delay);
moel@345: 			}
moel@345:             System.Diagnostics.Debug.WriteLine("IterateIcons Stopped");
moel@345: 		}
moel@345: 
moel@345: 		public static event EventHandler IconChanged;
moel@345: 	}
moel@345: }