public InnerGestureListener(TapGestureHandler tapGestureHandler, PanGestureHandler panGestureHandler, SwipeGestureHandler swipeGestureHandler)
{
if (tapGestureHandler == null)
{
throw new ArgumentNullException(nameof(tapGestureHandler));
}
if (panGestureHandler == null)
{
throw new ArgumentNullException(nameof(panGestureHandler));
}
if (swipeGestureHandler == null)
{
throw new ArgumentNullException(nameof(swipeGestureHandler));
}
_tapGestureHandler = tapGestureHandler;
_panGestureHandler = panGestureHandler;
_swipeGestureHandler = swipeGestureHandler;
_tapDelegate = tapGestureHandler.OnTap;
_tapGestureRecognizers = tapGestureHandler.TapGestureRecognizers;
_scrollDelegate = panGestureHandler.OnPan;
_scrollStartedDelegate = panGestureHandler.OnPanStarted;
_scrollCompleteDelegate = panGestureHandler.OnPanComplete;
_swipeDelegate = swipeGestureHandler.OnSwipe;
_swipeCompletedDelegate = swipeGestureHandler.OnSwipeComplete;
}
protected override void Dispose(bool disposing)
{
if (_disposed)
{
return;
}
_disposed = true;
if (disposing)
{
_panGestureHandler = null;
_swipeGestureHandler = null;
_tapGestureHandler = null;
_tapDelegate = null;
_tapGestureRecognizers = null;
_scrollDelegate = null;
_scrollStartedDelegate = null;
_scrollCompleteDelegate = null;
_swipeDelegate = null;
_swipeCompletedDelegate = null;
_dragAndDropGestureHandler?.Dispose();
_dragAndDropGestureHandler = null;
}
base.Dispose(disposing);
}
protected VisualElementRenderer() : base(Forms.Context)
{
_tapGestureHandler = new TapGestureHandler(() => View);
_panGestureHandler = new PanGestureHandler(() => View, Context.FromPixels);
_pinchGestureHandler = new PinchGestureHandler(() => View);
_gestureDetector =
new Lazy <GestureDetector>(
() =>
new GestureDetector(
_gestureListener =
new InnerGestureListener(_tapGestureHandler.OnTap, _tapGestureHandler.TapGestureRecognizers, _panGestureHandler.OnPan, _panGestureHandler.OnPanStarted, _panGestureHandler.OnPanComplete)));
_scaleDetector = new Lazy <ScaleGestureDetector>(
() => new ScaleGestureDetector(Context, new InnerScaleListener(_pinchGestureHandler.OnPinch, _pinchGestureHandler.OnPinchStarted, _pinchGestureHandler.OnPinchEnded))
);
}