first commit

LibreHardwareMonitor-0.9.4/Aga.Controls/Tree/NodeControls/ExpandingIcon.cs

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