Class BasicTreeUI.TreeExpansionHandler

java.lang.Object

javax.swing.plaf.basic.BasicTreeUI.TreeExpansionHandler

All Implemented Interfaces:: EventListener, TreeExpansionListener

Enclosing class:: BasicTreeUI

public class BasicTreeUI.TreeExpansionHandler extends Object implements TreeExpansionListener

Updates the TreeState in response to nodes expanding/collapsing.

Constructor Summary

Constructor	Description
`TreeExpansionHandler()`	Constructs a `TreeExpansionHandler`.

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.

Methods declared in class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

TreeExpansionHandler

public TreeExpansionHandler()

Constructs a TreeExpansionHandler.

Method Details

treeExpanded

public void treeExpanded(TreeExpansionEvent event)

Called whenever an item in the tree has been expanded.

Specified by:: treeExpanded in interface TreeExpansionListener
Parameters:: event - a TreeExpansionEvent containing a TreePath object for the expanded node

treeCollapsed

public void treeCollapsed(TreeExpansionEvent event)

Called whenever an item in the tree has been collapsed.

Specified by:: treeCollapsed in interface TreeExpansionListener
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/plaf/basic/BasicTreeUI.TreeExpansionHandler.html