private void AddGestureRecognizers()
{
try
{
if (NativeView == null)
{
return;
}
if (!NativeView.GestureRecognizers?.Contains(_rightGestureRecognizer) ?? true)
{
NativeView.AddGestureRecognizer(_rightGestureRecognizer);
}
if (!NativeView.GestureRecognizers?.Contains(_leftGestureRecognizer) ?? true)
{
NativeView.AddGestureRecognizer(_leftGestureRecognizer);
}
if (!NativeView.GestureRecognizers?.Contains(_upGestureRecognizer) ?? true)
{
NativeView.AddGestureRecognizer(_upGestureRecognizer);
}
if (!NativeView.GestureRecognizers?.Contains(_downGestureRecognizer) ?? true)
{
NativeView.AddGestureRecognizer(_downGestureRecognizer);
}
}
catch (Exception)
{ }
}
/// <summary>
/// Raises the element changed event.
/// </summary>
/// <param name="e">E.</param>
protected override void OnElementChanged(ElementChangedEventArgs <NControlView> e)
{
base.OnElementChanged(e);
if (e.OldElement != null)
{
if (null != _gestureRecognizer)
{
RemoveGestureRecognizer(_gestureRecognizer);
_gestureRecognizer = null;
}
e.OldElement.OnInvalidate -= HandleInvalidate;
}
if (e.NewElement != null)
{
e.NewElement.OnInvalidate += HandleInvalidate;
if ((null == _gestureRecognizer) && (null != NativeView))
{
_gestureRecognizer = new UITouchesGestureRecognizer(e.NewElement, NativeView);
NativeView.AddGestureRecognizer(_gestureRecognizer);
}
}
}
void InitializeNativeRecognizer()
{
var renderer = Recognizer.View.GetRenderer();
if (renderer == null)
{
throw new InvalidOperationException("attempted to initialize a native gesture recognizers for a view before it had created it's renderer");
}
NativeView = renderer.NativeView;
//workaroudn for irritating bugn which causes renderer to fail
if (typeof(NativeGestureType).Equals(typeof(UIPinchGestureRecognizer)))
{
NativeRecognizer = new UIPinchGestureRecognizer(OnGesture) as NativeGestureType;
}
else
{
Action <NativeGestureType> action = OnGesture;
NativeRecognizer = (NativeGestureType)Activator.CreateInstance(typeof(NativeGestureType), action);
}
ConfigureNativeGestureRecognizer();
NativeView.UserInteractionEnabled = true;
NativeView.AddGestureRecognizer(NativeRecognizer);
}
protected override void OnElementChanged(ElementChangedEventArgs <FlyoutMenu> e)
{
base.OnElementChanged(e);
_pressedGestureRecognizer = new UIPressedGestureRecognizer();
_pressedGestureRecognizer.Pressed += OnPressed;
_pressedGestureRecognizer.Released += OnReleased;
_pressedGestureRecognizer.Canceled += OnCanceled;
_pressedGestureRecognizer.Moved += OnMoved;
NativeView.AddGestureRecognizer(_pressedGestureRecognizer);
}
protected override void OnElementChanged(ElementChangedEventArgs <ListView> e)
{
base.OnElementChanged(e);
UITapGestureRecognizer _tap = new UITapGestureRecognizer();
_tap.AddTarget(() => {
NativeView.EndEditing(true);
});
_tap.CancelsTouchesInView = false;
NativeView.AddGestureRecognizer(_tap);
}
public override void ViewWillAppear(bool animated)
{
base.ViewWillAppear(animated);
NativeView.AddGestureRecognizer(new UISwipeGestureRecognizer(() => SelectNextTab(1))
{
Direction = UISwipeGestureRecognizerDirection.Left, ShouldRecognizeSimultaneously = ShouldRecognizeSimultaneously
});
NativeView.AddGestureRecognizer(new UISwipeGestureRecognizer(() => SelectNextTab(-1))
{
Direction = UISwipeGestureRecognizerDirection.Right, ShouldRecognizeSimultaneously = ShouldRecognizeSimultaneously
});
}
protected override void OnElementChanged(ElementChangedEventArgs <BoxView> e)
{
base.OnElementChanged(e);
if (e?.NewElement != null)
{
NativeView?.AddGestureRecognizer(new UIGestureRecognizer()
{
Delegate = new BoxViewGestureRecognizerDelegate(Element as MaterialBoxView)
});
}
}
protected override void OnElementChanged(VisualElementChangedEventArgs e)
{
base.OnElementChanged(e);
_page = (GesturedContentPage)e.NewElement;
// Subscribe to the events here
if (_page.CaptureSwipeRightToLeft)
{
NativeView.AddGestureRecognizer(new UISwipeGestureRecognizer(g => _page.OnSwipeRightToLeft())
{
Direction = UISwipeGestureRecognizerDirection.Left
});
}
if (_page.CaptureSwipeLeftToRight)
{
NativeView.AddGestureRecognizer(new UISwipeGestureRecognizer(g => _page.OnSwipeLeftToRight())
{
Direction = UISwipeGestureRecognizerDirection.Right
});
}
if (_page.CaptureSwipeBottomToTop)
{
NativeView.AddGestureRecognizer(new UISwipeGestureRecognizer(g => _page.OnSwipeBottomToTop())
{
Direction = UISwipeGestureRecognizerDirection.Up
});
}
if (_page.CaptureSwipeTopToBottom)
{
NativeView.AddGestureRecognizer(new UISwipeGestureRecognizer(g => _page.OnSwipeTopToBottom())
{
Direction = UISwipeGestureRecognizerDirection.Down
});
}
if (_page.CaptureTap)
{
NativeView.AddGestureRecognizer(new UITapGestureRecognizer(g => _page.OnTap())
{
NumberOfTapsRequired = 1
});
}
if (_page.CaptureLongTap)
{
NativeView.AddGestureRecognizer(new UILongPressGestureRecognizer(g => _page.OnLongTap()));
}
}
protected override void OnElementChanged(ElementChangedEventArgs <Frame> e)
{
base.OnElementChanged(e);
if (e.NewElement != null)
{
var tapDetector = new UITapGestureRecognizer(() =>
{
FrameRipple.Tap?.Invoke();
});
NativeView.AddGestureRecognizer(tapDetector);
}
}
