protected override void PointerPositionCore(PointerEventInfo info, ILevelGeometry viewport)
{
if (_snapManager == null)
_snapManager = new SnappingManager(GetSnappingSourceOrigin(), GetSnappingSourceBounds(), GridSize);
}
protected override void StartPointerSequenceCore(PointerEventInfo info, ILevelGeometry viewport)
{
_snapManager = new SnappingManager(GetSnappingSourceOrigin(), GetSnappingSourceBounds(), GridSize);
}
protected override void PointerLeaveFieldCore()
{
_snapManager = null;
}