private void treeViewAdv_DragOver(object sender, System.Windows.Forms.DragEventArgs e)
{
// Determine drag effects
bool droppable = true;
TreeNodeAdv destinationNode = null;
TreeViewAdv treeView = sender as TreeViewAdv;
Point ptInTree = treeView.PointToClient(new Point(e.X, e.Y));
this.currentSourceNode = null;
// Looking for a single tree node.
if (e.Data.GetDataPresent(typeof(TreeNodeAdv[])))
{
// Get the destination and source node.
destinationNode = treeView.GetNodeAtPoint(ptInTree);
TreeNodeAdv[] sourceNode = (TreeNodeAdv[])e.Data.GetData(typeof(TreeNodeAdv[]));
// Cache this for use later in the TreeDragDrop_QueryAllowedPositionsForNode event handler.
this.currentSourceNode = sourceNode;
//droppable = this.CanDrop(sourceNode, destinationNode);
}
else
{
droppable = false;
}
if (droppable)
{
// If Moving is allowed:
e.Effect = DragDropEffects.Move;
}
else
{
e.Effect = DragDropEffects.None;
}
// Let the highlight tracker keep track of the current highlight node.
this.treeViewDragHighlightTracker.SetHighlightNode(destinationNode, ptInTree);
}