private void HandleUpdate()
{
if (!needUpdate)
{
return;
}
needUpdate = false;
Monitor.Enter(this);
try
{
if (previewInterest != null)
{
previewInterest.Dispose();
previewInterest = null;
waitingForCI = null;
}
if (_legend != null)
{
try
{
IFuture renderedLegendFuture =
_legend.GetRenderedLegendFuture(displayableSource, (FutureFeatures)5);
if (previewFuture != renderedLegendFuture)
{
previewFuture = renderedLegendFuture;
AsyncRef asyncRef =
(AsyncRef)renderedLegendFuture.Realize("LegendOptionsPanel.UpdatePreviewPanel");
if (asyncRef.present == null)
{
waitingForCI = new CallbackIgnorinator(this);
asyncRef.AddCallback(waitingForCI.Callback);
asyncRef.SetInterest(524296);
previewInterest = new InterestList();
previewInterest.Add(asyncRef);
previewInterest.Activate();
UpdatePreviewImage(null);
}
else
{
if (asyncRef.present is ImageRef)
{
UpdatePreviewImage((ImageRef)asyncRef.present);
}
}
}
}
catch (Legend.RenderFailedException)
{
}
}
}
finally
{
Monitor.Exit(this);
}
}
