void LoadRecognizers()
{
if (ElementGestureRecognizers == null)
{
return;
}
#if __MOBILE__
if (_shouldReceiveTouch == null)
{
// Cache this so we don't create a new UITouchEventArgs instance for every recognizer
_shouldReceiveTouch = ShouldReceiveTouch;
}
#endif
for (int i = 0; i < ElementGestureRecognizers.Count; i++)
{
IGestureRecognizer recognizer = ElementGestureRecognizers[i];
if (_gestureRecognizers.ContainsKey(recognizer))
{
continue;
}
var nativeRecognizer = GetNativeRecognizer(recognizer);
if (nativeRecognizer != null)
{
#if __MOBILE__
nativeRecognizer.ShouldReceiveTouch = _shouldReceiveTouch;
#endif
_handler.AddGestureRecognizer(nativeRecognizer);
_gestureRecognizers[recognizer] = nativeRecognizer;
}
}
var toRemove = _gestureRecognizers.Keys.Where(key => !ElementGestureRecognizers.Contains(key)).ToArray();
for (int i = 0; i < toRemove.Length; i++)
{
IGestureRecognizer gestureRecognizer = toRemove[i];
var uiRecognizer = _gestureRecognizers[gestureRecognizer];
_gestureRecognizers.Remove(gestureRecognizer);
_handler.RemoveGestureRecognizer(uiRecognizer);
uiRecognizer.Dispose();
}
}
void LoadRecognizers()
{
if (ElementGestureRecognizers == null)
{
return;
}
foreach (var recognizer in ElementGestureRecognizers)
{
if (_gestureRecognizers.ContainsKey(recognizer))
{
continue;
}
var nativeRecognizer = GetNativeRecognizer(recognizer);
if (nativeRecognizer != null)
{
#if __MOBILE__
nativeRecognizer.ShouldReceiveTouch = _shouldReceive;
#endif
_handler.AddGestureRecognizer(nativeRecognizer);
_gestureRecognizers[recognizer] = nativeRecognizer;
}
}
var toRemove = _gestureRecognizers.Keys.Where(key => !ElementGestureRecognizers.Contains(key)).ToArray();
foreach (var gestureRecognizer in toRemove)
{
var uiRecognizer = _gestureRecognizers[gestureRecognizer];
_gestureRecognizers.Remove(gestureRecognizer);
_handler.RemoveGestureRecognizer(uiRecognizer);
uiRecognizer.Dispose();
}
}
void LoadRecognizers()
{
if (ElementGestureRecognizers == null)
{
return;
}
#if __MOBILE__
if (_shouldReceiveTouch == null)
{
// Cache this so we don't create a new UITouchEventArgs instance for every recognizer
_shouldReceiveTouch = ShouldReceiveTouch;
}
#endif
#if __MOBILE__
UIDragInteraction uIDragInteraction = null;
UIDropInteraction uIDropInteraction = null;
if (_dragAndDropDelegate != null)
{
foreach (var interaction in _renderer.NativeView.Interactions)
{
if (interaction is UIDragInteraction uIDrag && uIDrag.Delegate == _dragAndDropDelegate)
{
uIDragInteraction = uIDrag;
}
if (interaction is UIDropInteraction uiDrop && uiDrop.Delegate == _dragAndDropDelegate)
{
uIDropInteraction = uiDrop;
}
}
}
bool dragFound = false;
bool dropFound = false;
#endif
for (int i = 0; i < ElementGestureRecognizers.Count; i++)
{
IGestureRecognizer recognizer = ElementGestureRecognizers[i];
if (_gestureRecognizers.ContainsKey(recognizer))
{
continue;
}
var nativeRecognizer = GetNativeRecognizer(recognizer);
if (nativeRecognizer != null && _handler != null)
{
#if __MOBILE__
nativeRecognizer.ShouldReceiveTouch = _shouldReceiveTouch;
#endif
_handler.AddGestureRecognizer(nativeRecognizer);
_gestureRecognizers[recognizer] = nativeRecognizer;
}
#if __MOBILE__
if (Forms.IsiOS11OrNewer && recognizer is DragGestureRecognizer)
{
dragFound = true;
_dragAndDropDelegate = _dragAndDropDelegate ?? new DragAndDropDelegate();
if (uIDragInteraction == null)
{
var interaction = new UIDragInteraction(_dragAndDropDelegate);
interaction.Enabled = true;
_renderer.NativeView.AddInteraction(interaction);
}
}
if (Forms.IsiOS11OrNewer && recognizer is DropGestureRecognizer)
{
dropFound = true;
_dragAndDropDelegate = _dragAndDropDelegate ?? new DragAndDropDelegate();
if (uIDropInteraction == null)
{
var interaction = new UIDropInteraction(_dragAndDropDelegate);
_renderer.NativeView.AddInteraction(interaction);
}
}
#endif
}
#if __MOBILE__
if (!dragFound && uIDragInteraction != null)
{
_renderer.NativeView.RemoveInteraction(uIDragInteraction);
}
if (!dropFound && uIDropInteraction != null)
{
_renderer.NativeView.RemoveInteraction(uIDropInteraction);
}
#endif
var toRemove = _gestureRecognizers.Keys.Where(key => !ElementGestureRecognizers.Contains(key)).ToArray();
for (int i = 0; i < toRemove.Length; i++)
{
IGestureRecognizer gestureRecognizer = toRemove[i];
var uiRecognizer = _gestureRecognizers[gestureRecognizer];
_gestureRecognizers.Remove(gestureRecognizer);
_handler.RemoveGestureRecognizer(uiRecognizer);
uiRecognizer.Dispose();
}
}