public override void Draw(DrawArgs drawArgs)
{
if (_delayedEventPublisher == null && SynchronizationContext.Current != null)
_delayedEventPublisher = new DelayedEventPublisher(OnDelayedProgressChanged, 1000, DelayedEventPublisherTriggerMode.Periodic);
var asyncFrame = Frame;
using (asyncFrame.AcquireLock())
{
if (!asyncFrame.IsAsyncLoaded)
{
if (!Visible) // if this is an off-screen draw, wait for data to be loaded
{
lock (_waitPixelData)
{
if (!asyncFrame.IsAsyncLoaded)
{
var completionHandler = new EventHandler((s, e) =>
{
lock (_waitPixelData)
{
Monitor.Pulse(_waitPixelData);
}
});
var onFrameAsyncLoaded = new AsyncPixelDataEventHandler(completionHandler);
var onFrameAsyncFaulted = new AsyncPixelDataFaultEventHandler(completionHandler);
asyncFrame.AsyncLoaded += onFrameAsyncLoaded;
asyncFrame.AsyncFaulted += onFrameAsyncFaulted;
asyncFrame.GetNormalizedPixelData();
// check the flag again, in case the event actually fired before we hooked up the handler
if (!asyncFrame.IsAsyncLoaded)
Monitor.Wait(_waitPixelData);
asyncFrame.AsyncLoaded -= onFrameAsyncLoaded;
asyncFrame.AsyncFaulted -= onFrameAsyncFaulted;
}
}
}
else if (!ApplicationGraphics.OfType<ProgressGraphic>().Any())
{
ProgressGraphic.Show(this, ApplicationGraphics, true, ProgressBarGraphicStyle.Continuous, false);
}
}
base.Draw(drawArgs);
}
}
