void OnDown(GestureMotionEvent e)
{
//TODO - really should be possible at this point - min distance should trigger began
State = GestureRecognizerState.Possible;
PointerId = e.GetPointerId(0);
Console.WriteLine("PAN POSSIBLE");
_rawTranslation = new Xamarin.Forms.Point(0, 0);
_currentPoint = new Xamarin.Forms.Point(e.GetX(), e.GetY());
_currentScreenPoint = new Xamarin.Forms.Point(e.GetX(), e.GetY());
_previousPoint = new Xamarin.Forms.Point(e.GetX(), e.GetY());
_startPoint = new Xamarin.Forms.Point(NativeView.GetX(), NativeView.GetY());
SendGestureEvent();
}
bool OnMove(GestureMotionEvent e)
{
_currentScreenPoint = new Xamarin.Forms.Point(e.GetX(), e.GetY());
var currentViewPosition = new Xamarin.Forms.Point(NativeView.GetX(), NativeView.GetY());
var currentViewOffset = new Xamarin.Forms.Point(currentViewPosition.X - _startPoint.X, currentViewPosition.Y - _startPoint.Y);
var eventPoint = new Xamarin.Forms.Point(e.GetX() + currentViewOffset.X, e.GetY() + currentViewOffset.Y);
var coords = new MotionEvent.PointerCoords();
e.GetPointerCoords(0, coords);
// Console.WriteLine ("CHANGED e2{0} coords {1},{2}", eventPoint, coords.X, coords.Y);
if (State != GestureRecognizerState.Possible && State != GestureRecognizerState.Began && State != GestureRecognizerState.Changed)
{
return(false);
}
if (e.GetX() < 0 || e.GetX() > NativeView.Width || e.GetY() < 0 || e.GetY() > NativeView.Height)
{
Console.WriteLine("Gesture exited from view - it's over");
State = GestureRecognizerState.Ended;
PointerId = -1;
SendGestureEvent();
return(false);
}
if (e.ActionMasked == MotionEventActions.Move || e.ActionMasked == MotionEventActions.Scroll)
{
_previousPoint = _currentPoint;
_currentPoint = eventPoint;
_velocity = new Xamarin.Forms.Point(_currentPoint.X - _previousPoint.X, _currentPoint.Y - _previousPoint.Y);
//TODO proper conversion
_rawTranslation.X += _velocity.X / 2;
_rawTranslation.Y += _velocity.Y / 2;
State = State == GestureRecognizerState.Possible ? GestureRecognizerState.Began : GestureRecognizerState.Changed;
e.IsCancelled = Recognizer.CancelsTouchesInView;
}
// Console.WriteLine ("State " + State + "_previousPoint " + _previousPoint + " _currentPoint" + _currentPoint);
SendGestureEvent();
return(false);
}