protected override void OnItemDrag(ItemDragEventArgs e)
{
// if the item wasn't even properly clicked on, don't start a drag
if (!_clickedNodeWasInBounds)
{
return;
}
base.OnItemDrag(e);
// Call dragstart event
if (DragStart != null)
{
DragStartEventArgs ea = new DragStartEventArgs();
ea.Nodes = SelectedNodes;
DragStart(this, ea);
if (ea.CancelDrag)
{
return;
}
}
DrawSelectedNodesAsDragSource();
// Start drag drop
DoDragDrop(SelectedNodes, DragDropEffects.All);
}
void treeview_DragStart(object sender, DragStartEventArgs e)
{
e.CancelDrag = !AllowDragging;
}