java.lang.Object
- javax.swing.plaf.basic.BasicTreeUI.TreeExpansionHandler

All Implemented Interfaces:

EventListener ， TreeExpansionListener

Enclosing class:

BasicTreeUI
```
public class BasicTreeUI.TreeExpansionHandler
extends Object
implements TreeExpansionListener
```
响应节点扩展/折叠更新TreeState。

构造方法摘要

构造方法

Constructor and Description

TreeExpansionHandler()

方法摘要

所有方法接口方法具体的方法
Modifier and Type	Method and Description
`void`	`treeCollapsed(TreeExpansionEvent event)` 当树中的项目已折叠时调用。
`void`	`treeExpanded(TreeExpansionEvent event)` 当树中的项目已被扩展时调用。

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- 构造方法详细信息
  - TreeExpansionHandler
```
public TreeExpansionHandler()
```
- 方法详细信息
  - treeExpanded
```
public void treeExpanded(TreeExpansionEvent event)
```
    当树中的项目已被扩展时调用。
    
    Specified by:
    
    treeExpanded在接口 TreeExpansionListener
  - treeCollapsed
```
public void treeCollapsed(TreeExpansionEvent event)
```
    当树中的项目已折叠时调用。
    
    Specified by:
    
    treeCollapsed在接口 TreeExpansionListener