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Delete all children when deleting a parent node (Read 1677 times)

newbieDraw YaBB Newbies Offline I love YaBB 1G - SP1! Posts: 24 Joined: Dec 22^nd, 2011	Delete all children when deleting a parent node May 2^nd, 2013 at 2:52pm	Print Post
	Hello Stoyo, I have developed an application that lets users draw/import nodes from database in a tree format. Is it possible to do the following (without elaborate coding)? 1. to delete all the children node when a parent is deleted. I recently faced an issue where the nodes still existed (isolated) on the diagram, but were not visible. 2. To copy all children when a parent is copied (given that the tree is collapsed from the parent node, so only parent node is visible). Thanks, Parijat


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Stoyo God Member Offline MindFusion support Posts: 13230 Joined: Jul 20^th, 2005	Re: Delete all children when deleting a parent node Reply #1 - May 2^nd, 2013 at 8:15pm	Print Post
	Hi Parijat, You should be able to implement it with some recursion. 1. Call the following method in response to your delete command from menus. To delete whole branch in response to del key, set DelKeyAction to None and handle KeyDown:Del yourself by calling the method on diagram.ActiveItem. Code void DeleteWithChildren(DiagramNode node) { foreach (var link in node.OutgoingLinks.Clone()) DeleteWithChildren(link.Destination); diagram.Items.Remove(node); } 2. Copying to clipboard works on currently selected items, so you will have to recursively select children before calling CopyToClipboard: Code void CopyWithChildren(DiagramNode node) { SelectWithChildren(node); diagramView.CopyToClipboard(true); diagram.Selection.Change(node); } void SelectWithChildren(DiagramNode node) { node.Selected = true; foreach (var link in node.OutgoingLinks) { link.Selected = true; SelectWithChildren(link.Destination); } } I hope that helps, Stoyan


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