javax.swing.event

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 and 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 Detail

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