private void ActivateFrame(int selectedIndex, int unselectedIndex)
{
if (!IsLoaded)
{
return;
}
TransitionerSlide oldSlide = null, newSlide = null;
for (var index = 0; index < Items.Count; index++)
{
var slide = GetSlide(Items[index]);
if (index == selectedIndex)
{
newSlide = slide;
slide.SetCurrentValue(TransitionerSlide.StateProperty, TransitionerSlideState.Current);
}
else if (index == unselectedIndex)
{
oldSlide = slide;
slide.SetCurrentValue(TransitionerSlide.StateProperty, TransitionerSlideState.Previous);
}
else
{
slide.SetCurrentValue(TransitionerSlide.StateProperty, TransitionerSlideState.None);
}
Panel.SetZIndex(slide, 0);
}
if (newSlide != null)
{
newSlide.Opacity = 1;
}
if (oldSlide != null && newSlide != null)
{
var wipe = selectedIndex > unselectedIndex ? oldSlide.ForwardWipe : oldSlide.BackwardWipe;
if (wipe != null)
{
wipe.Wipe(oldSlide, newSlide, GetTransitionOrigin(newSlide), this);
}
else
{
DoStack(newSlide, oldSlide);
oldSlide.Opacity = 0;
}
}
else if (oldSlide != null || newSlide != null)
{
DoStack(oldSlide ?? newSlide);
if (oldSlide != null)
{
oldSlide.Opacity = 0;
}
}
_nextTransitionOrigin = null;
}
private Point GetTransitionOrigin(TransitionerSlide slide)
{
if (_nextTransitionOrigin != null)
{
return(_nextTransitionOrigin.Value);
}
if (slide.ReadLocalValue(TransitionerSlide.TransitionOriginProperty) != DependencyProperty.UnsetValue)
{
return(slide.TransitionOrigin);
}
return(DefaultTransitionOrigin);
}
