private void Element_Drop(jQueryEvent evt, DropEvent ui) {
if (currentDropTarget == null) {
DragEnded();
return;
}
TreeNode dropParent, draggedNode = selectedNode;
int dropIndex;
if (currentDropTarget.above) {
// Drop above the active node.
dropParent = currentDropTarget.node.parent;
dropIndex = GetTreeNodeChildIndex(currentDropTarget.node);
}
else {
// Drop into the active node.
dropParent = currentDropTarget.node;
dropIndex = dropParent.children.Count;
}
TreeDragDropCompletingEventArgs completingArgs = new TreeDragDropCompletingEventArgs(draggedNode, dropParent, dropIndex);
OnDragDropCompleting(completingArgs);
if (completingArgs.Cancel) {
DragEnded();
return;
}
SetSelection(null, false, false); // Temporarily remove the selection.
// Remove the node from its current position.
Element draggedElem = RemoveTreeNodeDOM(draggedNode);
draggedNode.parent.children.RemoveAt(GetTreeNodeChildIndex(draggedNode));
if (draggedNode.parent.children.Count == 0)
UpdateExpansionClasses(GetNodeElement(draggedNode.parent), draggedNode.parent.icon, false, draggedNode.parent.expanded); // Need to fix the classes to say that this node is now a leaf.
// Add the node to its new position.
if (dropParent.treeIfRoot == null) {
DoSetTreeNodeExpanded(dropParent, true, true);
Element dropParentN = GetNodeElement(dropParent);
if (dropIndex == dropParentN.Children[1].Children.Length)
dropParentN.Children[1].AppendChild(draggedElem);
else
dropParentN.Children[1].InsertBefore(draggedElem, dropParentN.Children[1].Children[dropIndex]);
}
else {
Element elem = GetElement();
if (dropIndex == elem.Children.Length)
elem.AppendChild(draggedElem);
else
elem.InsertBefore(draggedElem, elem.Children[dropIndex]);
}
draggedNode.parent = dropParent;
dropParent.children.Insert(dropIndex, draggedNode);
// Restore the selection to the new node.
SetSelection(draggedNode, false, false);
var completedArgs = new TreeDragDropCompletedEventArgs(draggedNode, dropParent, dropIndex);
OnDragDropCompleted(completedArgs);
DragEnded();
}
protected virtual void OnDragDropCompleting(TreeDragDropCompletingEventArgs e) {
if (DragDropCompleting != null)
DragDropCompleting(this, e);
}