Children of Parent in JFace TreeViewer

Question

How do we retrieve all the children of a selected item in JFace TreeViewer ? I am able to get the parent of a selected item, but not the children.

Answer 1

You normally use the tree content provider to get both the children and the parent of a selection in the tree viewer.

IStructuredSelection sel = treeViewer.getStructuredSelection();

Object selElement = sel.getFirstElement();

ITreeContentProvider provider = (ITreeContentProvider)treeViewer.getContentProvider();

Object [] children = provider.getChildren(selElement);

Object parent = provider.getParent(selElement);

Note: When using TreeViewer you should avoid looking at the Tree or TreeItem controls that TreeViewer uses internally.