void CheckForBoundaryHop(UITouch touch)
{
long id = touch.Handle.ToInt64();
// TODO: Might require converting to a List for multiple hits
TouchRecognizer recognizerHit = null;
foreach (UIView view in viewDictionary.Keys)
{
CGPoint location = touch.LocationInView(view);
if (new CGRect(new CGPoint(), view.Frame.Size).Contains(location))
{
recognizerHit = viewDictionary[view];
}
}
if (recognizerHit != idToTouchDictionary[id])
{
if (idToTouchDictionary[id] != null)
{
FireEvent(idToTouchDictionary[id], id, TouchActionType.Exited, touch, true);
}
if (recognizerHit != null)
{
FireEvent(recognizerHit, id, TouchActionType.Entered, touch, true);
}
idToTouchDictionary[id] = recognizerHit;
}
}
void FireEvent(TouchRecognizer recognizer, long id, TouchActionType actionType, UITouch touch, bool isInContact)
{
// Convert touch location to Xamarin.Forms Point value
CGPoint cgPoint = touch.LocationInView(recognizer.View);
Point xfPoint = new Point(cgPoint.X, cgPoint.Y);
// Get the method to call for firing events
Action <Element, TouchActionEventArgs> onTouchAction = recognizer.touchEffect.OnTouchAction;
// Call that method
onTouchAction(recognizer.element,
new TouchActionEventArgs(id, actionType, xfPoint, isInContact));
}
protected override void OnAttached()
{
// Get the iOS UIView corresponding to the Element that the effect is attached to
view = Control ?? Container;
// Get access to the TouchEffect class in the PCL
TouchTracking.TouchEffect effect = (TouchTracking.TouchEffect)Element.Effects.FirstOrDefault(e => e is TouchTracking.TouchEffect);
if (effect != null && view != null)
{
// Create a TouchRecognizer for this UIView
touchRecognizer = new TouchRecognizer(Element, view, effect);
view.AddGestureRecognizer(touchRecognizer);
}
}