internal void ProcessDown(int id, Vector2 position, DateTime time)
{
TouchElement element = new TouchElement()
{
Origin = position,
Position = position,
Valid = true,
LockedGesture = GestureType.None,
DownTime = DateTime.Now
};
_gesture.GestureType = GestureType.Down;
_gesture.Origin = position;
_gesture.Position = position;
_gesture.TouchId = id;
_gesture.Offset = Vector2.Zero;
_gesture.Time = time;
OnGesture();
element.LockedListener = _gesture.PointerCapturedBy;
_elements.Remove(id);
_elements.Add(id, element);
TouchDown?.Invoke(id, position);
}
void ProcessMove(int id, Vector2 position, float time)
{
TouchElement element = _elements[id];
Vector2 move = position - element.Position;
element.Position = position;
_gesture.GestureType = GestureType.Move;
_gesture.Origin = element.Origin;
_gesture.Position = position;
_gesture.TouchId = id;
_gesture.Offset = move;
_gesture.PointerCapturedBy = element.LockedListener;
if (move != Vector2.Zero)
{
OnGesture();
}
if (!_gesture.Handled)
{
AnalyzeMoveGestures(id, ref element, ref move);
}
element.LockedListener = _gesture.PointerCapturedBy;
_elements.Remove(id);
_elements.Add(id, element);
}
void ProcessDown(int id, Vector2 position)
{
TouchElement element = new TouchElement()
{
Origin = position,
Position = position,
Valid = true,
LockedGesture = GestureType.None,
DownTime = DateTime.Now
};
_gesture.GestureType = GestureType.Down;
_gesture.Origin = position;
_gesture.Position = position;
_gesture.TouchId = id;
_gesture.Offset = Vector2.Zero;
OnGesture();
element.LockedListener = _gesture.PointerCapturedBy;
_elements.Add(id, element);
if (TouchDown != null)
{
TouchDown(id, position);
}
}
void AnalyzeMoveGestures(int id, ref TouchElement element, ref Vector2 move)
{
if ((element.LockedGesture & (GestureType.HorizontalDrag | GestureType.VerticalDrag | GestureType.Hold | GestureType.HoldStart | GestureType.Down)) == GestureType.None)
{
Vector2 drag = element.Position - element.Origin;
if (Math.Abs(drag.X) > MinDragSize && Math.Abs(drag.X) > Math.Abs(drag.Y))
{
element.LockedGesture |= GestureType.HorizontalDrag;
}
else if (Math.Abs(drag.Y) > MinDragSize && Math.Abs(drag.Y) > Math.Abs(drag.X))
{
element.LockedGesture |= GestureType.VerticalDrag;
}
if (drag.Length() > MinDragSize)
{
element.LockedGesture |= GestureType.FreeDrag;
move = drag;
}
}
if ((element.LockedGesture & (GestureType.HorizontalDrag | GestureType.FreeDrag | GestureType.VerticalDrag)) != GestureType.None)
{
_gesture.TouchId = id;
_gesture.Position = element.Position;
_gesture.Origin = element.Origin;
_gesture.Offset = move;
_gesture.GestureType = element.LockedGesture;
OnGesture();
}
else
{
_gesture.TouchId = id;
_gesture.Position = element.Position;
_gesture.Origin = element.Origin;
_gesture.Offset = Vector2.Zero;
if (element.LockedGesture == GestureType.None)
{
TimeSpan ellapsed = DateTime.Now - element.DownTime;
if (ellapsed.TotalMilliseconds > HoldStartTimeInMs)
{
element.LockedGesture = GestureType.HoldStart;
_gesture.GestureType = GestureType.HoldStart;
OnGesture();
}
}
else if (element.LockedGesture == GestureType.HoldStart)
{
TimeSpan ellapsed = DateTime.Now - element.DownTime;
if (move.Length() > MinDragSize)
{
element.LockedGesture = GestureType.Hold;
_gesture.GestureType = GestureType.HoldCancel;
OnGesture();
return;
}
if (ellapsed.TotalMilliseconds > HoldTimeInMs)
{
element.LockedGesture = GestureType.Hold;
_gesture.GestureType = GestureType.Hold;
OnGesture();
}
}
}
}
void ProcessUp(int id, Vector2 position, float time)
{
TouchElement element = _elements[id];
Vector2 move = position - element.Position;
element.Position = position;
element.LockedListener = null;
_elements.Remove(id);
_gesture.GestureType = GestureType.Up;
_gesture.Origin = element.Origin;
_gesture.Position = position;
_gesture.PointerCapturedBy = element.LockedListener;
_gesture.TouchId = id;
_gesture.Offset = move;
OnGesture();
if (element.LockedGesture == GestureType.HoldStart)
{
_gesture.GestureType = GestureType.HoldCancel;
OnGesture();
}
if (!_gesture.Handled)
{
if (element.LockedGesture == GestureType.None)
{
if ((element.Origin - element.Position).Length() < MinDragSize && (DateTime.Now - element.DownTime).TotalMilliseconds < HoldStartTimeInMs)
{
bool doubleTap = false;
if (_lastTap.HasValue)
{
if ((element.Position - _lastTap.Value.Position).Length() < DoubleTapSize)
{
_gesture.GestureType = GestureType.DoubleTap;
OnGesture();
doubleTap = true;
if (_gesture.Handled)
{
_lastTap = null;
return;
}
}
}
_gesture.GestureType = GestureType.Tap;
OnGesture();
if (!_gesture.Handled)
{
if (doubleTap)
{
_lastTap = null;
}
else
{
_lastTap = new LastTap()
{
Position = _gesture.Position,
Time = 0
};
}
}
}
}
}
}