void WhenDragOver(DragEventArgs e)
{
if (_manager == null)
{
return;
}
var point = treeView1.PointToClient(new Point(e.X, e.Y));
var node = treeView1.GetNodeAt(point);
if (null == node)
{
return;
}
if (node.Tag is ProjectId)
{
var requestId = (string)e.Data.GetData(DataFormats.StringFormat);
var projectId = (ProjectId)node.Tag;
if (_manager.CanDropToProject(requestId, projectId))
{
e.Effect = DragDropEffects.Move;
}
else
{
e.Effect = DragDropEffects.None;
}
}
else
{
e.Effect = DragDropEffects.None;
}
//
}