private static bool ShouldSkipPreviewFor(MediaElementThumnailGrabber.ThumbnailWorkerParameters parameters)
{
if (parameters.Source == (Uri)null || !parameters.Source.IsAbsoluteUri)
{
return(true);
}
string localPath = parameters.Source.LocalPath;
return(string.IsNullOrEmpty(localPath) || !PathHelper.FileExists(localPath));
}
private void ProcessNextQueueItem()
{
if (this.workQueue.Count == 0)
{
if (this.workerMediaPlayer == null)
{
return;
}
this.workerMediaPlayer.MediaOpened -= new EventHandler(this.OnMediaOpened);
this.workerMediaPlayer.MediaFailed -= new EventHandler <ExceptionEventArgs>(this.OnMediaFailed);
this.workerMediaPlayer.Close();
this.workerMediaPlayer = (MediaPlayer)null;
}
else
{
MediaElementThumnailGrabber.ThumbnailWorkerParameters parameters = this.workQueue.Peek();
if (MediaElementThumnailGrabber.ShouldSkipPreviewFor(parameters))
{
this.workQueue.Dequeue();
UIThreadDispatcher.Instance.BeginInvoke(DispatcherPriority.Normal, (Action)(() => this.ProcessNextQueueItem()));
}
else
{
if (this.workerMediaPlayer == null)
{
this.workerMediaPlayer = new MediaPlayer();
this.workerMediaPlayer.MediaOpened += new EventHandler(this.OnMediaOpened);
this.workerMediaPlayer.MediaFailed += new EventHandler <ExceptionEventArgs>(this.OnMediaFailed);
}
if (this.workerMediaPlayer.Source != parameters.Source)
{
try
{
this.workerMediaPlayer.ScrubbingEnabled = false;
this.workerMediaPlayer.Open(parameters.Source);
}
catch (Exception ex)
{
this.HandleLoadFail();
}
}
else
{
this.MoveToNextWorkItem(this.RenderFrame(), (string)null);
}
}
}
}
public void BeginGrabThumbnail(Uri source, Action <Uri, BitmapSource, string> callback)
{
if (!this.SupportsFirstFramePreview)
{
return;
}
MediaElementThumnailGrabber.ThumbnailWorkerParameters workerParameters = new MediaElementThumnailGrabber.ThumbnailWorkerParameters();
workerParameters.Source = source;
workerParameters.Callback = callback;
bool flag = this.workQueue.Count > 0;
this.workQueue.Enqueue(workerParameters);
if (flag)
{
return;
}
UIThreadDispatcher.Instance.BeginInvoke(DispatcherPriority.Normal, (Action)(() => this.ProcessNextQueueItem()));
}
private void MoveToNextWorkItem(BitmapSource image, string errorMessage)
{
MediaElementThumnailGrabber.ThumbnailWorkerParameters workerParameters = this.workQueue.Dequeue();
workerParameters.Callback(workerParameters.Source, image, errorMessage);
UIThreadDispatcher.Instance.BeginInvoke(DispatcherPriority.Normal, (Action)(() => this.ProcessNextQueueItem()));
}
