/// <summary>
/// Stops the overlay.
/// </summary>
/// <param name="overlay">The overlay.</param>
private static void StopOverlay(Overlay overlay)
{
if (StopFadeInTimer(overlay))
return;
var storyboard = CreateStoryboard(overlay, 1, 0);
storyboard.Completed += (sender, args) => overlay.IsActive = false;
if (!overlay._lastShown.HasValue)
{
storyboard.Begin();
return;
}
var elapsedMilliseconds = (DateTime.Now - overlay._lastShown.Value).Duration().TotalMilliseconds;
var minimumDuration = overlay.MinimumDuration;
if (elapsedMilliseconds < minimumDuration)
{
var duration = minimumDuration - elapsedMilliseconds;
overlay._fadeOutTimer = new DispatcherTimer(DispatcherPriority.Normal, overlay.Dispatcher)
{
Interval = TimeSpan.FromMilliseconds(duration)
};
overlay._fadeOutTimer.Tick += (sender, args) =>
{
storyboard.Begin();
StopFadeOutTimer(overlay);
};
overlay._fadeOutTimer.Start();
}
else
{
storyboard.Begin();
}
}
private static Storyboard CreateStoryboard(Overlay overlay, double @from, double to)
{
var storyboard = new Storyboard();
var doubleAnimation = new DoubleAnimation
{
From = @from,
To = to,
Duration = TimeSpan.FromMilliseconds(overlay.AnimationSpeed)
};
storyboard.Children.Add(doubleAnimation);
Storyboard.SetTarget(doubleAnimation, overlay);
Storyboard.SetTargetProperty(doubleAnimation, new PropertyPath("Opacity"));
return storyboard;
}
private static bool StopFadeOutTimer(Overlay overlay)
{
if (overlay._fadeOutTimer == null) return false;
overlay._fadeOutTimer.Stop();
overlay._fadeOutTimer = null;
return true;
}
/// <summary>
/// Begins enabling the overlay.
/// </summary>
/// <param name="overlay">The overlay.</param>
private static void BeginOverlay(Overlay overlay)
{
overlay._lastShown = null;
if (StopFadeOutTimer(overlay))
return;
var delay = overlay.Delay;
if (delay <= 0)
{
overlay.IsActive = true;
CreateStoryboard(overlay, 0, 1).Begin();
return;
}
overlay._fadeInTimer = new DispatcherTimer(DispatcherPriority.Normal, overlay.Dispatcher)
{
Interval = TimeSpan.FromMilliseconds(delay)
};
overlay._fadeInTimer.Tick += (sender, args) =>
{
overlay.IsActive = true;
CreateStoryboard(overlay, 0, 1).Begin();
overlay._lastShown = DateTime.Now;
StopFadeInTimer(overlay);
};
overlay._fadeInTimer.Start();
}