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.

Methods

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.

Methods

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

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https://docs.oracle.com/en/java/javase/11/docs/api/java.desktop/javax/swing/event/TreeWillExpandListener.html