/// <summary>
/// Triggers the disappearance of a UIElement.
/// </summary>
/// <param name="uiElement"></param>
/// <param name="done"></param>
public static void Disappear(UIElement uiElement, Action <UIElement> done)
{
DateTime startTime = DateTime.Now;
Transition transition = GetDisappearance(uiElement);
TransitionState transitionState = null;
if (activeDisappearances.TryGetValue(uiElement, out transitionState))
{
transitionState.Progress = double.NaN;
activeDisappearances.Remove(uiElement);
}
if (activeAppearances.TryGetValue(uiElement, out transitionState))
{
if (transition != null)
{
startTime = startTime - TimeSpan.FromSeconds((1.0 - transitionState.Progress) * transition.Duration.TimeSpan.TotalSeconds);
}
transitionState.Progress = double.NaN;
activeAppearances.Remove(uiElement);
}
if (transition != null)
{
transitionState = transition.CreateTransitionState();
activeDisappearances.Add(uiElement, transitionState);
transitionState.Transition = transition;
transitionState.UIElement = uiElement;
transitionState.StartTime = startTime;
transitionState.EndTime = transitionState.StartTime + transition.Duration.TimeSpan;
transitionState.Done = done;
transitionState.Progress = 1.0;
}
else
{
if (done != null)
{
done(uiElement);
}
}
}
/// <summary>
/// Cancels a UIElements appearance or disappearance.
/// </summary>
/// <param name="uiElement"></param>
/// <param name="done"></param>
/// <returns></returns>
public static bool Cancel(UIElement uiElement, bool done)
{
Dictionary <UIElement, TransitionState> active = activeAppearances.ContainsKey(uiElement) ? activeAppearances :
activeDisappearances.ContainsKey(uiElement) ? activeDisappearances :
null;
if (active != null)
{
TransitionState transitionState = active[uiElement];
transitionState.Progress = double.NaN;
if (done && transitionState.Done != null)
{
transitionState.Done(uiElement);
}
active.Remove(uiElement);
return(true);
}
return(false);
}
