Class BasicTreeUI.ComponentHandler

java.lang.Object

java.awt.event.ComponentAdapter

javax.swing.plaf.basic.BasicTreeUI.ComponentHandler

All Implemented Interfaces:

ActionListener, ComponentListener, EventListener

Enclosing class:

BasicTreeUI

public class BasicTreeUI.ComponentHandler
extends ComponentAdapter
implements ActionListener

Updates the preferred size when scrolling (if necessary).

Field Summary

Fields

Modifier and Type	Field	Description
protected JScrollBar	scrollBar	ScrollBar that is being adjusted.
protected Timer	timer	Timer used when inside a scrollpane and the scrollbar is adjusting.

Constructor Summary

Constructors

Constructor	Description
ComponentHandler()	Constructs a ComponentHandler.

Method Summary

Modifier and Type	Method	Description
void	actionPerformed(ActionEvent ae)	Public as a result of Timer.
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 declared in class java.awt.event.ComponentAdapter

componentHidden, componentMoved, componentResized, componentShown

Methods declared in class java.lang.Object

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

Field Details

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 Details

ComponentHandler

public ComponentHandler()

Constructs a ComponentHandler.

Method Details

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.

Returns:

the JScrollPane housing the JTree

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

Parameters:

ae - the event to be processed