Here I want to show a component I wrote that inherits from org.netbeans.swing.outline.Outline. It is called JHierarchicalList. In contrast to the Outline component, JHierarchicalList does not display the entire tree, but only a single path.
I'd like to add that these changes do not affect the data model, since the main work is in the class extended from javax.swing.tree.AbstractLayoutCache.
On the left, you see Outline, on the right, JHierarchicalList:
Sources are being finalized, here is the demo JAR so far. Run it as follows:
java -jar demo-hierarchical-list.jar