private UIElement GetManipulatableElement()
{
UIElement element = InputElement.GetContainingUIElement(_directlyOver as DependencyObject) as UIElement;
if (element != null)
{
element = Manipulation.FindManipulationParent(element);
}
return(element);
}
private void PromoteMainToManipulation(UIElement manipulatableElement, TouchEventArgs touchEventArgs)
{
RoutedEvent routedEvent = touchEventArgs.RoutedEvent;
if (routedEvent == Touch.TouchDownEvent)
{
// When touch goes down or if we're in the middle of a move, capture so that we can
// start manipulation. We could be in the middle of a move if a device delayed
// promotion, such as the StylusTouchDevice, due to other gesture detection.
Capture(manipulatableElement);
}
else if ((routedEvent == Touch.TouchUpEvent) && PromotingToManipulation)
{
// When touch goes up, release capture so that we can stop manipulation.
Capture(null);
}
else if ((routedEvent == Touch.GotTouchCaptureEvent) && !PromotingToManipulation)
{
UIElement element = _captured as UIElement;
if (element != null && element.IsManipulationEnabled)
{
// When touch gets capture and if the captured element
// is manipulable, then add it as a manipulator to
// the captured element.
_manipulatingElement = new WeakReference(element);
Manipulation.AddManipulator(element, this);
PromotingToManipulation = true;
OnManipulationStarted();
}
}
else if ((routedEvent == Touch.LostTouchCaptureEvent) && PromotingToManipulation && _manipulatingElement != null)
{
UIElement element = _manipulatingElement.Target as UIElement;
_manipulatingElement = null;
if (element != null)
{
// When touch loses capture, remove it as a manipulator.
Manipulation.TryRemoveManipulator(element, this);
PromotingToManipulation = false;
}
}
}