Exemple #1
0
 protected virtual void OnFlingDetected(SKFlingDetectedEventArgs e) =>
 FlingDetected?.Invoke(this, e);
Exemple #2
0
        private bool OnTouchReleased(SKTouchEventArgs e)
        {
            var handled = false;

            var ticks         = DateTime.Now.Ticks;
            var location      = e.Location;
            var releasedTouch = touches[e.Id];

            touches.Remove(e.Id);

            var points = GetInContactTouchPoints();

            // no more fingers on the screen
            if (points.Length == 0)
            {
                // check to see if it was a fling
                var velocity = flingTracker.CalculateVelocity(e.Id, ticks);
                if (Math.Abs(velocity.X * velocity.Y) > (flingVelocityThreshold * flingVelocityThreshold))
                {
                    var args = new SKFlingDetectedEventArgs(velocity.X, velocity.Y);
                    OnFlingDetected(args);
                    handled = args.Handled;
                }

                // when tapping, the finger never goes to exactly the same location
                var isAround = SKPoint.Distance(releasedTouch.Location, initialTouch) < touchSlopPixels;
                if (isAround && (ticks - releasedTouch.Tick) < (e.DeviceType == SKTouchDeviceType.Mouse ? shortClickTicks : longTapTicks))
                {
                    // add a timer to detect the type of tap (single or multi)
                    void TimerHandler(object state)
                    {
                        var l = (SKPoint)state;

                        if (!handled)
                        {
                            if (tapCount > 1)
                            {
                                var args = new SKTapDetectedEventArgs(location, tapCount);
                                OnDoubleTapDetected(args);
                                handled = args.Handled;
                            }
                            else
                            {
                                var args = new SKTapDetectedEventArgs(l);
                                OnSingleTapDetected(args);
                                handled = args.Handled;
                            }
                        }
                        tapCount = 1;
                        multiTapTimer?.Dispose();
                        multiTapTimer = null;
                    };
                    multiTapTimer = new Timer(TimerHandler, location, delayTapMilliseconds, -1);
                }
                else if (isAround && (ticks - releasedTouch.Tick) >= longTapTicks)
                {
                    // if the finger was down for a long time, then it is a long tap
                    if (!handled)
                    {
                        var args = new SKTapDetectedEventArgs(location);
                        OnLongPressDetected(args);
                        handled = args.Handled;
                    }
                }
            }

            // update the fling tracker
            flingTracker.RemoveId(e.Id);

            if (points.Length == 1)
            {
                // if there is still 1 finger on the screen, then try start a new gesture
                var args = new SKGestureEventArgs(points);
                OnGestureStarted(args);
                handled = args.Handled;

                // if no gesture was started, then we will handle it
                if (!handled)
                {
                    touchMode             = TouchMode.Single;
                    previousValues.Center = points[0];
                    handled = true;
                }
            }

            if (!handled)
            {
                // the gesture was not handled, so end it
                var args = new SKGestureEventArgs(points);
                OnGestureEnded(args);
                handled = args.Handled;

                if (points.Length == 0)
                {
                    touchMode = TouchMode.None;
                }
            }

            return(handled);
        }