Esempio n. 1
0
        private void DetectPinchAndPanGestures(TouchActionType touchActionType)
        {
            TouchManipulationInfo[] infos = new TouchManipulationInfo[_touchDictionary.Count];
            _touchDictionary.Values.CopyTo(infos, 0);

            if (infos.Length == 1)
            {
                SKPoint previousPoint = infos[0].PreviousPoint;
                SKPoint newPoint      = infos[0].NewPoint;
                OnPan?.Invoke(this, new PanEventArgs(previousPoint, newPoint, touchActionType));
            }
            else if (infos.Length >= 2)
            {
                int     pivotIndex    = infos[0].NewPoint == infos[0].PreviousPoint ? 0 : 1;
                SKPoint pivotPoint    = infos[pivotIndex].NewPoint;
                SKPoint newPoint      = infos[1 - pivotIndex].NewPoint;
                SKPoint previousPoint = infos[1 - pivotIndex].PreviousPoint;
                OnPinch?.Invoke(this, new PinchEventArgs(previousPoint, newPoint, pivotPoint, touchActionType));

                if (TwoFingersPanEnabled)
                {
                    SKPoint delta       = newPoint - previousPoint;
                    SKPoint halfOfDelta = new SKPoint(0.5f * delta.X, 0.5f * delta.Y);
                    OnPan?.Invoke(this, new PanEventArgs(new SKPoint(), halfOfDelta, touchActionType));
                }
            }
        }
Esempio n. 2
0
        public void ProcessTouchEvent(long id, TouchActionType type, SKPoint location)
        {
            switch (type)
            {
            case TouchActionType.Pressed:
                _touchDictionary.Add(id, new TouchManipulationInfo
                {
                    PreviousPoint = location,
                    NewPoint      = location,
                    MoveCounter   = 0
                });
                break;

            case TouchActionType.Moved:
                if (!_touchDictionary.ContainsKey(id))
                {
                    return;
                }
                TouchManipulationInfo info = _touchDictionary[id];
                info.NewPoint    = location;
                info.MoveCounter = info.MoveCounter + 1;
                DetectPinchAndPanGestures(type);
                info.PreviousPoint = info.NewPoint;
                break;

            case TouchActionType.Released:
                if (!_touchDictionary.ContainsKey(id))
                {
                    return;
                }
                _touchDictionary[id].NewPoint = location;
                DetectTapGestures();
                DetectPinchAndPanGestures(type);
                _touchDictionary.Remove(id);
                break;

            case TouchActionType.Cancelled:
                if (!_touchDictionary.ContainsKey(id))
                {
                    return;
                }
                _touchDictionary.Remove(id);
                break;
            }
        }
Esempio n. 3
0
        private void DetectPinchAndPanGestures(TouchActionType touchActionType)
        {
            TouchManipulationInfo[] infos = new TouchManipulationInfo[_touchDictionary.Count];
            _touchDictionary.Values.CopyTo(infos, 0);

            if (infos.Length == 1)
            {
                SKPoint previousPoint = infos[0].PreviousPoint;
                SKPoint newPoint      = infos[0].NewPoint;
                OnPan?.Invoke(this, new PanEventArgs(previousPoint, newPoint, touchActionType));
            }
            else if (infos.Length >= 2)
            {
                int     pivotIndex    = infos[0].NewPoint == infos[0].PreviousPoint ? 0 : 1;
                SKPoint pivotPoint    = infos[pivotIndex].NewPoint;
                SKPoint newPoint      = infos[1 - pivotIndex].NewPoint;
                SKPoint previousPoint = infos[1 - pivotIndex].PreviousPoint;
                OnPinch?.Invoke(this, new PinchEventArgs(previousPoint, newPoint, pivotPoint, touchActionType));
            }
        }
Esempio n. 4
0
        private void DetectTapGestures()
        {
            TouchManipulationInfo[] infos = new TouchManipulationInfo[_touchDictionary.Count];
            _touchDictionary.Values.CopyTo(infos, 0);
            if (infos.Length != 1)
            {
                return;
            }
            SKPoint point = infos[0].PreviousPoint;

            if (infos[0].MoveCounter > MaxTapMoveCounter)
            {
                return;
            }
            var tapEventArgs = new TapEventArgs(point);

            var now         = DateTime.Now;
            var lastTapTime = LastTapTime;

            LastTapTime = now;

            OnTap?.Invoke(this, tapEventArgs);
            if (now - lastTapTime < DoubleTapDelay)
            {
                OnDoubleTap?.Invoke(this, tapEventArgs);
                LastDoubleTapTime = now;
                LastTapTime       = DateTime.MinValue; //Reset double tap timer
            }
            else
            {
                _timer = new Timer(_ =>
                {
                    if (DateTime.Now - LastDoubleTapTime < DoubleTapDelay)
                    {
                        return;
                    }
                    OnSingleTap?.Invoke(this, tapEventArgs);
                }, null, DoubleTapDelay.Milliseconds, Timeout.Infinite);
            }
        }