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 ComponentAdapter

componentHidden, componentMoved, componentResized, componentShown

Modifier and Type	Method	Description
void	componentHidden(ComponentEvent e)	Invoked when the component has been made invisible.
void	componentMoved(ComponentEvent e)	Invoked when the component's position changes.
void	componentResized(ComponentEvent e)	Invoked when the component's size changes.
void	componentShown(ComponentEvent e)	Invoked when the component has been made visible.

Methods declared in class Object

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

Modifier and Type	Method	Description
protected Object	clone()	Answers a new instance of the same class as the receiver, whose slots have been filled in with the values in the slots of the receiver.
boolean	equals(Object o)	Compares the argument to the receiver, and answers true if they represent the same object using a class specific comparison.
protected void	finalize()	Deprecated, for removal: This API element is subject to removal in a future version. May cause performance issues, deadlocks and hangs.
final Class<? extends Object>	getClass()	Answers the unique instance of java.lang.Class which represents the class of the receiver.
int	hashCode()	Answers an integer hash code for the receiver.
final void	notify()	Causes one thread which is waiting on the receiver to be made ready to run.
final void	notifyAll()	Causes all threads which are waiting on the receiver to be made ready to run.
String	toString()	Answers a string containing a concise, human-readable description of the receiver.
final void	wait()	Causes the thread which sent this message to be made not ready to run pending some change in the receiver (as indicated by notify or notifyAll).
final void	wait(long time)	Causes the thread which sent this message to be made not ready to run either pending some change in the receiver (as indicated by notify or notifyAll) or the expiration of the timeout.
final void	wait(long time, int frac)	Causes the thread which sent this message to be made not ready to run either pending some change in the receiver (as indicated by notify or notifyAll) or the expiration of the timeout.

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