void IDropTarget.DragLeave()
{
if (_mDragTarget != null)
{
_mDragTarget.Dispose();
_mDragTarget = null;
}
_mTreeView.HideSelection = false;
}
void IDropTarget.DragOver(int grfKeyState, Point pt,
ref int pdwEffect)
{
var clientLocation = _mTreeView.PointToClient(pt);
var node = _mTreeView.HitTest(clientLocation).Node;
CheckDragScroll(clientLocation);
if (node != null)
{
if ((_mDragTarget == null) ||
(node != _mDragTarget.Node))
{
_mDragTarget?.Dispose();
_mDragTarget = new DragTarget(node, grfKeyState,
pt, ref pdwEffect);
}
else
{
_mDragTarget.DragOver(grfKeyState, pt, ref pdwEffect);
}
}
else
{
pdwEffect = 0;
}
}