protected override void OnPointerInput(
PointerInputEvent touch,
ref GestureEventResult result)
{
result.DidHandleEvent = true;
if (touch.State == PointerInputState.Began)
{
if (this.State == GestureState.Possible)
{
this.State = GestureState.Began;
this._gestureStart = touch.Point;
this._delegate.OnTapBegan();
}
}
else if (touch.State == PointerInputState.Moved)
{
if (this.State == GestureState.Began)
{
double distance = touch.Point.DistanceTo(this._gestureStart);
if (distance > Application.TouchSlop)
{
this.State = GestureState.Failed;
this._delegate.OnTapEnded();
}
}
}
else if (touch.State == PointerInputState.Ended)
{
if (this.State == GestureState.Began)
{
double distance = touch.Point.DistanceTo(this._gestureStart);
if (distance <= Application.TouchSlop)
{
this.State = GestureState.Recognized;
this._delegate.OnTapped();
}
else
{
this.State = GestureState.Failed;
}
this._delegate.OnTapEnded();
}
else
{
this.State = GestureState.Failed;
}
}
else if (touch.State == PointerInputState.Canceled)
{
if (this.State == GestureState.Began)
{
this.State = GestureState.Failed;
this._delegate.OnTapEnded();
}
else
{
this.State = GestureState.Failed;
}
}
}
protected override void OnPointerInput(
PointerInputEvent touch,
ref GestureEventResult result)
{
result.DidHandleEvent = true;
if (touch.State == PointerInputState.Began)
{
if (this.State == GestureState.Possible)
{
this.State = GestureState.Began;
this._swipeDirection = 0;
this._gestureStart = touch.Point;
this._delegate.OnTapBegan();
}
}
else if (this.State != GestureState.Possible)
{
float dx = (float)(touch.Point.X - this._gestureStart.X);
if (this._swipeDirection == 0)
{
this._swipeDirection = Math.Sign(dx);
}
if (Math.Sign(dx) != this._swipeDirection)
{
dx = 0;
}
else
{
dx = Math.Abs(dx);
}
double dy = Math.Abs(touch.Point.Y - this._gestureStart.Y);
if (touch.State == PointerInputState.Moved)
{
if (this.State == GestureState.Began)
{
if (dx >= Application.TouchSlop)
{
this._delegate.OnSwipeBegan(this._swipeDirection);
this.State = GestureState.Changed;
}
else if (dy >= Application.TouchSlop)
{
this.State = GestureState.Failed;
this._delegate.OnTapEnded();
}
}
else if (this.State == GestureState.Changed)
{
this._delegate.OnSwipeMoved(this._swipeDirection, dx);
}
}
else if (touch.State == PointerInputState.Ended)
{
if (this.State == GestureState.Began)
{
this.State = GestureState.Recognized;
this._delegate.OnTapped();
this._delegate.OnTapEnded();
}
else if (this.State == GestureState.Changed)
{
this._delegate.OnSwipeEnded(this._swipeDirection, dx);
this._delegate.OnTapEnded();
this.State = GestureState.Recognized;
}
else
{
this.State = GestureState.Failed;
}
}
else if (touch.State == PointerInputState.Canceled)
{
if (this.State == GestureState.Began)
{
this._delegate.OnTapEnded();
}
else if (this.State == GestureState.Changed)
{
this._delegate.OnSwipeCanceled(this._swipeDirection);
this._delegate.OnTapEnded();
}
if (this.State != GestureState.Possible)
{
this.State = GestureState.Canceled;
}
}
}
}
