protected override void OnPointerCaptureLost(
PointerRoutedEventArgs e)
{
base.OnPointerCaptureLost(e);
bool result = false;
var itemContainer = this.ItemContainer;
if (null != itemContainer)
{
var position = e.GetCurrentPoint(this).Position;
Point point = new Point((float)position.X, (float)position.Y);
var pointerEvent = new PointerInputEvent(point, PointerInputState.Canceled, e.Pointer.IsInContact);
result = itemContainer.HandlePointerEvent(pointerEvent);
}
if (this._pointerCaptured)
{
this.ReleasePointerCapture(e.Pointer);
}
e.Handled = result;
}
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;
}
}
}
}
private void Element_Touch(
object sender,
AndroidView.TouchEventArgs e)
{
bool result = false;
if (this.IsInputVisible)
{
var control = this.ViewDelegate;
if (null != control)
{
var motionEvent = e.Event;
bool isInContact;
bool isKnownAction;
PointerInputState pointerState;
if (motionEvent.Action == MotionEventActions.Down)
{
pointerState = PointerInputState.Began;
isKnownAction = true;
isInContact = true;
}
else if (motionEvent.Action == MotionEventActions.Up)
{
pointerState = PointerInputState.Ended;
isKnownAction = true;
isInContact = true;
}
else if (motionEvent.Action == MotionEventActions.Move)
{
pointerState = PointerInputState.Moved;
isKnownAction = true;
isInContact = true;
}
else if (motionEvent.Action == MotionEventActions.Cancel)
{
pointerState = PointerInputState.Canceled;
isKnownAction = true;
isInContact = true;
}
else if (motionEvent.Action == MotionEventActions.HoverMove)
{
pointerState = PointerInputState.Moved;
isKnownAction = true;
isInContact = false;
}
else
{
pointerState = PointerInputState.Canceled;
isKnownAction = false;
isInContact = false;
}
if (isKnownAction)
{
var contactPoint = new Point(
this.PixelsToDevicePixels(motionEvent.GetX()),
this.PixelsToDevicePixels(motionEvent.GetY()));
var pointerEvent = new PointerInputEvent(contactPoint, pointerState, isInContact);
result = control.HandlePointerEvent(pointerEvent);
if ((result) && (pointerState == PointerInputState.Began))
{
this.CapturePointer();
}
else if ((pointerState == PointerInputState.Ended) ||
(pointerState == PointerInputState.Canceled))
{
this.ReleasePointer();
}
}
}
}
e.Handled = result;
}
