internal protected override void Update(IEnumerable <Gesture> gestures)
{
if (state == State.Initial && Input.WasMousePressed(ButtonIndex))
{
state = State.Recognizing;
MousePressPosition = Input.MousePosition;
began.Raise();
}
if (state == State.Recognizing)
{
if (!Input.IsMousePressed(ButtonIndex))
{
ended.Raise();
state = State.Initial;
}
else if ((MousePosition - MousePressPosition).SqrLength > DragThreshold.Sqr())
{
CancelOtherGestures(gestures);
state = State.Changing;
prevMousePosition = Input.MousePosition;
recognized.Raise();
}
}
if (state == State.Changing)
{
var curMousePos = Input.MousePosition;
if (prevMousePosition != curMousePos)
{
changed.Raise();
}
prevMousePosition = curMousePos;
if (!Input.IsMousePressed(ButtonIndex))
{
ended.Raise();
state = State.Initial;
}
}
}
protected override bool CanStartDrag()
{
return
((MousePosition - MousePressPosition).SqrLength > DragThreshold.Sqr() ||
TouchDistance != Vector2.Distance(Touch0, Touch1));
}