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 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.

Methods

treeWillExpand

void treeWillExpand(TreeExpansionEvent event)
             throws ExpandVetoException

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

Throws:: ExpandVetoException

treeWillCollapse

void treeWillCollapse(TreeExpansionEvent event)
               throws ExpandVetoException

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

Throws:: ExpandVetoException

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https://docs.oracle.com/javase/8/docs/api/javax/swing/event/TreeWillExpandListener.html