void CheckForBoundaryHop(NSSet touches)
{
long id = touches.Handle.ToInt64();
// TODO: Might require converting to a List for multiple hits
TouchRecognizer_Touch recognizerHit = null;
foreach (UIView view in _viewDictionary.Keys)
{
var locations = touches.Cast <UITouch>().Select(touch => touch.LocationInView(view));
if (locations.Any(location => IsInView(view, location)))
{
recognizerHit = _viewDictionary[view];
}
}
if (!ReferenceEquals(recognizerHit, _idToTouchDictionary[id]))
{
if (_idToTouchDictionary[id] != null)
{
RaiseEvent(_idToTouchDictionary[id], id, TouchState.Exited, touches, true);
}
if (recognizerHit != null)
{
RaiseEvent(recognizerHit, id, TouchState.Entered, touches, true);
}
_idToTouchDictionary[id] = recognizerHit;
}
}
private static void RaiseEvent(TouchRecognizer_Touch recognizer, long id, TouchState actionType, NSSet touches, bool isInContact)
{
var formsPoints = touches.Cast <UITouch>()
.Select(touch => touch.LocationInView(recognizer.View))
.Select(cgPoint => new TouchPoint(cgPoint.ToPoint(), IsInView(recognizer.View, cgPoint)))
.ToList();
// Get the method to call for firing events
// note: this would live on the VisualElement and not in an effect :)
var effect = recognizer._formsView.Effects.FirstOrDefault(x => x.Is <TouchEffect>()) as TouchEffect;
effect?.SendTouched(recognizer._formsView, new TouchEventArgs(actionType, formsPoints, id, isInContact));
}
protected override void OnAttached()
{
if (!Element.Is(out _formsElement))
{
throw new InvalidOperationException("Can only attach Touch Effects to Views");
}
_uiGestureRecognizer = new TouchRecognizer_Touch(_formsElement, UiView);
UiView.UserInteractionEnabled = true;
// none of this has to do with Forms GestureRecognizers
if (!(UiView.GestureRecognizers is null) && UiView.GestureRecognizers.Contains(_uiGestureRecognizer))
{
UiView.RemoveGestureRecognizer(_uiGestureRecognizer);
}
UiView.AddGestureRecognizer(_uiGestureRecognizer);
}