Interface TreeExpansionListener

All Superinterfaces:: EventListener

All Known Implementing Classes:: BasicTreeUI.TreeExpansionHandler, JTree.AccessibleJTree

public interface TreeExpansionListener extends EventListener

The listener that's notified when a tree expands or collapses a node. For further documentation and examples see How to Write a Tree Expansion Listener, a section in The Java Tutorial.

Method Summary

Modifier and Type	Method	Description
`void`	`treeCollapsed(TreeExpansionEvent event)`	Called whenever an item in the tree has been collapsed.
`void`	`treeExpanded(TreeExpansionEvent event)`	Called whenever an item in the tree has been expanded.

Method Details

treeExpanded

void treeExpanded(TreeExpansionEvent event)

Called whenever an item in the tree has been expanded.

Parameters:: event - a TreeExpansionEvent containing a TreePath object for the expanded node

treeCollapsed

void treeCollapsed(TreeExpansionEvent event)

Called whenever an item in the tree has been collapsed.

Parameters:: event - a TreeExpansionEvent containing a TreePath object for the collapsed node

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https://docs.oracle.com/en/java/javase/25/docs/api/java.desktop/javax/swing/event/TreeExpansionListener.html