W3cubDocs

/OpenJDK 21

Interface TreeWillExpandListener

All Superinterfaces:
EventListener
public interface TreeWillExpandListener extends EventListener
The listener that's notified when a tree expands or collapses a node. For further information and examples see How to Write a Tree-Will-Expand Listener, a section in The Java Tutorial.

Method Summary

Modifier and Type Method Description
void treeWillCollapse(TreeExpansionEvent event)
Invoked whenever a node in the tree is about to be collapsed.
void treeWillExpand(TreeExpansionEvent event)
Invoked whenever a node in the tree is about to be expanded.

Method Details

treeWillExpand

void treeWillExpand(TreeExpansionEvent event) throws ExpandVetoException
Invoked whenever a node in the tree is about to be expanded.
Parameters:
event - a TreeExpansionEvent containing a TreePath object for the node
Throws:
ExpandVetoException - to signify expansion has been canceled

treeWillCollapse

void treeWillCollapse(TreeExpansionEvent event) throws ExpandVetoException
Invoked whenever a node in the tree is about to be collapsed.
Parameters:
event - a TreeExpansionEvent containing a TreePath object for the node
Throws:
ExpandVetoException - to signify collapse has been canceled

© 1993, 2023, Oracle and/or its affiliates. All rights reserved.
Documentation extracted from Debian's OpenJDK Development Kit package.
Licensed under the GNU General Public License, version 2, with the Classpath Exception.
Various third party code in OpenJDK is licensed under different licenses (see Debian package).
Java and OpenJDK are trademarks or registered trademarks of Oracle and/or its affiliates.
https://docs.oracle.com/en/java/javase/21/docs/api/java.desktop/javax/swing/event/TreeWillExpandListener.html