public void NavigateBack(FrameAnimationBase animation = null)
{
if (Container.Children.Count == 0)
{
throw new InvalidOperationException("There is no current element being displayed!");
}
if (elementStack.Count == 0)
{
throw new InvalidOperationException("Cannot navigate back as there are no more elements in the stack!");
}
if (animating)
{
return;
}
FrameworkElement currentChild = Container.Children[0] as FrameworkElement;
FrameworkElement newChild = elementStack.Pop();
Container.Children.Add(newChild);
if (animation != null)
{
animating = true;
animation.AnimationEnded += FrameNavigation_AnimationEnded;
(animation as IFrameAnimation).Start(currentChild, newChild, Container);
}
else
{
FrameNavigation_AnimationEnded(null, new FrameAnimationBase.AnimationEndedArgs(currentChild, newChild));
}
}
public void NavigateTo(FrameworkElement element, FrameAnimationBase animation = null)
{
if (element is null)
{
throw new ArgumentNullException($"{nameof(element)} cannot be null!");
}
if (animating)
{
return;
}
FrameworkElement previousChild = Container.Children.Count == 0 ? null : Container.Children[0] as FrameworkElement;
FrameworkElement newChild = element;
Container.Children.Add(newChild);
if (previousChild != null)
{
elementStack.Push(previousChild);
}
if (animation != null)
{
animating = true;
animation.AnimationEnded += FrameNavigation_AnimationEnded;
(animation as IFrameAnimation).Start(previousChild, newChild, Container);
}
else
{
FrameNavigation_AnimationEnded(null, new FrameAnimationBase.AnimationEndedArgs(previousChild, newChild));
}
}
