public virtual void TreeMouseDown(MouseEventArgs e)
{
_hitInfo = null;
var hitInfo = _treeView.CalcHitInfo(new Point(e.X, e.Y));
if (hitInfo == null)
{
return;
}
if (hitInfo.Node == null)
{
return;
}
if (!_presenter.CanDrag(nodeFrom(hitInfo.Node)))
{
return;
}
_hitInfo = hitInfo;
}