public static void Animate(Image image, EventHandler onFrameChangedHandler)
{
// must be non-null and contain animation time frames
if (!CanAnimate(image))
{
return;
}
// is animation already in progress ?
if (ht.ContainsKey(image))
{
return;
}
PropertyItem item = image.GetPropertyItem(0x5100); // FrameDelay in libgdiplus
byte[] value = item.Value;
int[] delay = new int [(value.Length >> 2)];
for (int i = 0, n = 0; i < value.Length; i += 4, n++)
{
int d = BitConverter.ToInt32(value, i) * 10;
// follow worse case (Opera) see http://news.deviantart.com/article/27613/
delay [n] = d < 100 ? 100 : d;
}
AnimateEventArgs aea = new AnimateEventArgs(image);
WorkerThread wt = new WorkerThread(onFrameChangedHandler, aea, delay);
Thread thread = new Thread(new ThreadStart(wt.LoopHandler));
thread.IsBackground = true;
aea.RunThread = thread;
ht.Add(image, aea);
thread.Start();
}
public static void StopAnimate(Image image, EventHandler onFrameChangedHandler)
{
if (image == null)
{
return;
}
if (ht.ContainsKey(image))
{
AnimateEventArgs evtArgs = (AnimateEventArgs)ht [image];
evtArgs.RunThread.Abort();
ht.Remove(image);
}
}
public WorkerThread(EventHandler frmChgHandler, AnimateEventArgs aniEvtArgs, int[] delay)
{
frameChangeHandler = frmChgHandler;
animateEventArgs = aniEvtArgs;
this.delay = delay;
}
// this method avoid checks that aren't requied for UpdateFrames()
private static void UpdateImageFrame(Image image)
{
AnimateEventArgs aea = (AnimateEventArgs)ht [image];
image.SelectActiveFrame(FrameDimension.Time, aea.GetNextFrame());
}