Overview | Package | Class | Use | Tree | Deprecated | Index | Help
| Swing 1.1
PREV CLASS NEXT CLASS | FRAMES NO FRAMES
SUMMARY: INNER | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD

## javax.swing.event
Interface TreeWillExpandListener

public abstract interface TreeWillExpandListener
extends java.util.EventListener

The listener that's notified when a tree expands or collapses a node.

Method Summary
`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 Detail

### treeWillExpand

    public void treeWillExpand(TreeExpansionEvent event)
                        throws ExpandVetoException

  Invoked whenever a node in the tree is about to be expanded.

### treeWillCollapse

    public void treeWillCollapse(TreeExpansionEvent event)
                          throws ExpandVetoException

  Invoked whenever a node in the tree is about to be collapsed.

Overview | Package | Class | Use | Tree | Deprecated | Index | Help
| Swing 1.1
PREV CLASS NEXT CLASS | FRAMES NO FRAMES
SUMMARY: INNER | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD

Submit a bug or feature
Java is a trademark or registered trademark of Sun Microsystems, Inc. in the US and other countries.
Copyright 1993-1998 Sun Microsystems, Inc. 901 San Antonio Road,
Palo Alto, California, 94303, U.S.A. All Rights Reserved.