protected override void OnAttached()
{
effect = TouchEffect.PickFrom(Element);
if (effect?.IsDisabled ?? true)
{
return;
}
effect.Element = (VisualElement)Element;
touchGesture = new TouchUITapGestureRecognizer(effect);
hoverGesture = new UIHoverGestureRecognizer(OnHover);
if (View != null)
{
if (((View as IVisualNativeElementRenderer)?.Control ?? View) is UIButton button)
{
button.AllTouchEvents += PreventButtonHighlight;
touchGesture.IsButton = true;
}
View.AddGestureRecognizer(touchGesture);
View.AddGestureRecognizer(hoverGesture);
View.UserInteractionEnabled = true;
}
}
/// <summary>
/// Initializes a new instance of the <see cref="HoverRecognizer"/> class.
/// </summary>
/// <param name="view">The native view.</param>
public HoverRecognizer(UIView view) : base(view)
{
if (!UIDevice.CurrentDevice.CheckSystemVersion(13, 0))
{
throw new NotSupportedException($"{nameof(HoverRecognizer)} is only supported on iOS 13 and above.");
}
_recognizer = new NativeHoverRecognizer(this);
view.AddGestureRecognizer(_recognizer);
}
protected override void OnDetached()
{
if (effect?.Element == null)
{
return;
}
if (((View as IVisualNativeElementRenderer)?.Control ?? View) is UIButton button)
{
button.AllTouchEvents -= PreventButtonHighlight;
}
View?.RemoveGestureRecognizer(touchGesture);
View?.RemoveGestureRecognizer(hoverGesture);
touchGesture?.Dispose();
hoverGesture?.Dispose();
touchGesture = null;
hoverGesture = null;
effect.Element = null;
effect = null;
}
