private void ShowAnimatedOverlay()
{
if (OverlayGrid is null)
{
throw new InvalidOperationException("Cannot find overlay in Associated object");
}
if (OverlayGrid.Visibility == Visibility.Visible && _overlayStoryboard is null)
{
return;
}
if (ActiveContentContainer.Visibility == Visibility.Hidden)
{
ActiveContentContainer.SetCurrentValue(UIElement.VisibilityProperty, Visibility.Visible);
}
Dispatcher.VerifyAccess();
var storyboard = AnimationService.GetFadeInAnimation(OverlayGrid);
_overlayStoryboard = storyboard;
if (TryGetOverlayFadingStoryboardAnimation(storyboard, out var animation))
{
OverlayGrid.SetCurrentValue(UIElement.VisibilityProperty, Visibility.Visible);
animation.SetCurrentValue(DoubleAnimation.ToProperty, (double?)0.7);
EventHandler completionHandler = null;
completionHandler = (sender, args) =>
{
storyboard.Completed -= completionHandler;
if (_overlayStoryboard == storyboard)
{
_overlayStoryboard = null;
}
};
storyboard.Completed += completionHandler;
OverlayGrid.BeginStoryboard(storyboard);
}
else
{
ShowOverlay();
}
}
