protected internal override void BeginTransition(TransitionPresenter transitionElement, ContentPresenter oldContent, ContentPresenter newContent)
{
TranslateTransform tt = new TranslateTransform(StartPoint.X * transitionElement.ActualWidth, StartPoint.Y * transitionElement.ActualHeight);
if (IsNewContentTopmost)
{
newContent.RenderTransform = tt;
}
else
{
oldContent.RenderTransform = tt;
}
DoubleAnimation da = new DoubleAnimation(EndPoint.X * transitionElement.ActualWidth, Duration);
da.EasingFunction = new SineEase()
{
EasingMode = EasingMode.EaseOut
};
tt.BeginAnimation(TranslateTransform.XProperty, da);
da.To = EndPoint.Y * transitionElement.ActualHeight;
da.Completed += delegate
{
EndTransition(transitionElement, oldContent, newContent);
};
tt.BeginAnimation(TranslateTransform.YProperty, da);
}
// Don't update content until done transitioning
private static object CoerceContent(object element, object value)
{
TransitionPresenter te = (TransitionPresenter)element;
if (te.IsTransitioning)
{
return(te.CurrentContentPresenter.Content);
}
return(value);
}
private static object CoerceTransition(object element, object value)
{
TransitionPresenter te = (TransitionPresenter)element;
if (te.IsTransitioning)
{
return(te._activeTransition);
}
return(value);
}
// Force clip to be true if the active Transition requires it
private static object CoerceClipToBounds(object element, object value)
{
TransitionPresenter transitionElement = (TransitionPresenter)element;
bool clip = (bool)value;
if (!clip && transitionElement.IsTransitioning)
{
Transition transition = transitionElement.Transition;
if (transition.ClipToBounds)
{
return(true);
}
}
return(value);
}
private static void OnContentTemplateSelectorChanged(object element, DependencyPropertyChangedEventArgs e)
{
TransitionPresenter te = (TransitionPresenter)element;
te.CurrentContentPresenter.ContentTemplateSelector = (DataTemplateSelector)e.NewValue;
}
private static void OnContentChanged(object element, DependencyPropertyChangedEventArgs e)
{
TransitionPresenter te = (TransitionPresenter)element;
te.BeginTransition();
}
//Transitions can override this to perform cleanup at the end of the transition
protected virtual void OnTransitionEnded(TransitionPresenter transitionElement, ContentPresenter oldContent, ContentPresenter newContent)
{
}
//Transitions should call this method when they are done
protected void EndTransition(TransitionPresenter transitionElement, ContentPresenter oldContent, ContentPresenter newContent)
{
OnTransitionEnded(transitionElement, oldContent, newContent);
transitionElement.OnTransitionCompleted();
}
// Called when an element is Removed from the TransitionPresenter's visual tree
protected internal virtual void BeginTransition(TransitionPresenter transitionElement, ContentPresenter oldContent, ContentPresenter newContent)
{
EndTransition(transitionElement, oldContent, newContent);
}
protected override void OnTransitionEnded(TransitionPresenter transitionElement, ContentPresenter oldContent, ContentPresenter newContent)
{
newContent.ClearValue(ContentPresenter.RenderTransformProperty);
oldContent.ClearValue(ContentPresenter.RenderTransformProperty);
}
