Java(TM) 2 Platform, Standard Edition, v1.2.2 API Specification: Class BasicTreeUI.ComponentHandler - JDK 5 Documentation v1.2.2, Java 2 SDK 英文文档

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Java^TM 2 Platform
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javax.swing.plaf.basic
Class BasicTreeUI.ComponentHandler

java.lang.Object
  |
  +--java.awt.event.ComponentAdapter
        |
        +--javax.swing.plaf.basic.BasicTreeUI.ComponentHandler

Enclosing class:: BasicTreeUI

public class BasicTreeUI.ComponentHandler
extends ComponentAdapter
implements ActionListener

Updates the preferred size when scrolling (if necessary).

Field Summary

protected JScrollBar scrollBar
          ScrollBar that is being adjusted.

protected Timer timer
          Timer used when inside a scrollpane and the scrollbar is adjusting.

Constructor Summary

BasicTreeUI.ComponentHandler()


Method Summary

void actionPerformed(ActionEvent ae)
          Public as a result of Timer.

void componentMoved(ComponentEvent e)
          Invoked when the component's position changes.

protected JScrollPane getScrollPane()
          Returns the JScrollPane housing the JTree, or null if one isn't found.

protected void startTimer()
          Creates, if necessary, and starts a Timer to check if need to resize the bounds.

Methods inherited from class java.awt.event.ComponentAdapter

componentHidden, componentResized, componentShown

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

timer

protected Timer timer

Timer used when inside a scrollpane and the scrollbar is adjusting.

scrollBar

protected JScrollBar scrollBar

ScrollBar that is being adjusted.

Constructor Detail

BasicTreeUI.ComponentHandler

public BasicTreeUI.ComponentHandler()

Method Detail

componentMoved

public void componentMoved(ComponentEvent e)

Description copied from class: ComponentAdapter

Invoked when the component's position changes.

Overrides:: componentMoved in class ComponentAdapter

startTimer

protected void startTimer()

Creates, if necessary, and starts a Timer to check if need to resize the bounds.

getScrollPane

protected JScrollPane getScrollPane()

Returns the JScrollPane housing the JTree, or null if one isn't found.

actionPerformed

public void actionPerformed(ActionEvent ae)

Public as a result of Timer. If the scrollBar is null, or not adjusting, this stops the timer and updates the sizing.

Specified by:: actionPerformed in interface ActionListener