/// <summary>
/// Initializes a new instance of the <see cref="SwipeRecognizer"/> class.
/// </summary>
/// <param name="view">The native view.</param>
/// <param name="directionMask">Optional swipe direction mask.</param>
/// <param name="numberOfTouchesRequired">Optional number of touches required.</param>
public SwipeRecognizer(UIView view, SwipeDirection directionMask = Defaults.DirectionMask, int numberOfTouchesRequired = Defaults.NumberofTouchesRequired) : base(view, directionMask, numberOfTouchesRequired)
{
_recognizers = new List <UISwipeGestureRecognizer>();
if (directionMask.HasFlag(SwipeDirection.Left))
{
var recognizer = new NativeSwipeGestureRecognizer(this, UISwipeGestureRecognizerDirection.Left);
_recognizers.Add(recognizer);
view.AddGestureRecognizer(recognizer);
}
if (directionMask.HasFlag(SwipeDirection.Right))
{
var recognizer = new NativeSwipeGestureRecognizer(this, UISwipeGestureRecognizerDirection.Right);
_recognizers.Add(recognizer);
view.AddGestureRecognizer(recognizer);
}
if (directionMask.HasFlag(SwipeDirection.Up))
{
var recognizer = new NativeSwipeGestureRecognizer(this, UISwipeGestureRecognizerDirection.Up);
_recognizers.Add(recognizer);
view.AddGestureRecognizer(recognizer);
}
if (directionMask.HasFlag(SwipeDirection.Down))
{
var recognizer = new NativeSwipeGestureRecognizer(this, UISwipeGestureRecognizerDirection.Down);
_recognizers.Add(recognizer);
view.AddGestureRecognizer(recognizer);
}
}
bool ISwipeGestureController.DetectSwipe(View sender, SwipeDirection direction)
{
var detected = false;
var threshold = Threshold;
if (direction.HasFlag(SwipeDirection.Left))
{
detected |= _totalX < -threshold;
}
if (direction.HasFlag(SwipeDirection.Right))
{
detected |= _totalX > threshold;
}
if (direction.HasFlag(SwipeDirection.Down))
{
detected |= _totalY > threshold;
}
if (direction.HasFlag(SwipeDirection.Up))
{
detected |= _totalY < -threshold;
}
if (detected)
{
SendSwiped(sender, direction);
}
return(detected);
}