protected override async void OnContentChanged(object oldContent, object newContent)
{
if (NavigationAnimation == null)
{
NavigationAnimation = new JumpLeftNavigationAnimation();
}
base.OnContentChanged(oldContent, newContent);
var oldElement = oldContent as UIElement;
var newElement = newContent as UIElement;
// Check if the template has been applied correctly
if (_firstContentPresenter == null || _secondContentPresenter == null || newElement == null)
{
return;
}
_animating = true;
try
{
AnimationDefinition closeAnimation;
AnimationDefinition openAnimation;
bool sequential;
if (_oneOff)
{
_oneOff = false;
closeAnimation = OneOffAnimation_Close;
openAnimation = OneOffkAnimation_Open;
sequential = OneOffAnimation_Sequential;
}
else if (_isForwardNavigation)
{
closeAnimation = NavigationAnimation.ForwardAnimationCloseOld;
openAnimation = NavigationAnimation.ForwardAnimationOpenNew;
sequential = NavigationAnimation.ForwardAnimationSequential;
}
else
{
closeAnimation = NavigationAnimation.BackAnimationCloseTop;
openAnimation = NavigationAnimation.BackAnimationReOpenBottom;
sequential = NavigationAnimation.BackAnimationSequential;
}
AnimationManager.ClearAnimationProperties(_oldContentPresenter);
_oldContentPresenter.Opacity = 1;
_oldContentPresenter.CacheMode = BitmapCacheMode;
_oldContentPresenter.Visibility = Visibility.Visible;
_oldContentPresenter.Content = oldElement;
_oldContentPresenter.IsHitTestVisible = false;
AnimationManager.ClearAnimationProperties(_newContentPresenter);
_newContentPresenter.Opacity = 0;
_newContentPresenter.CacheMode = BitmapCacheMode;
_newContentPresenter.Visibility = Visibility.Visible;
_newContentPresenter.Content = newElement;
_newContentPresenter.IsHitTestVisible = false;
if (openAnimation == null)
{
_newContentPresenter.Opacity = 1;
}
if ((_isForwardNavigation && !NavigationAnimation.ForwardAnimationReveal) ||
(!_isForwardNavigation && NavigationAnimation.BackAnimationReveal))
{
Canvas.SetZIndex(_newContentPresenter, 1);
Canvas.SetZIndex(_oldContentPresenter, 0);
}
else
{
Canvas.SetZIndex(_newContentPresenter, 0);
Canvas.SetZIndex(_oldContentPresenter, 1);
}
if (sequential)
{
if (closeAnimation != null)
{
await _oldContentPresenter.AnimateAsync(closeAnimation);
}
if (openAnimation != null)
{
await _newContentPresenter.AnimateAsync(openAnimation);
}
}
else
{
var list = new List <Task <FrameworkElement> >();
if (closeAnimation != null)
{
list.Add(_oldContentPresenter.AnimateAsync(closeAnimation));
}
if (openAnimation != null)
{
list.Add(_newContentPresenter.AnimateAsync(openAnimation));
}
await Task.WhenAll(list);
}
}
finally
{
_oldContentPresenter.Visibility = Visibility.Collapsed;
_oldContentPresenter.Content = null;
_newContentPresenter.CacheMode = null;
_newContentPresenter.Opacity = 1;
_newContentPresenter.IsHitTestVisible = true;
_animating = false;
}
}
