Class 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).

Fields

Modifier and Type Field and Description
protected JScrollBar scrollBar

ScrollBar that is being adjusted.
protected Timer timer

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

Constructors

Constructor and Description
ComponentHandler()

Methods

Modifier and Type Method and Description
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

Fields

timer

protected Timer timer

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

scrollBar

protected JScrollBar scrollBar

ScrollBar that is being adjusted.

Constructors

ComponentHandler

public ComponentHandler()

Methods

componentMoved

public void componentMoved(ComponentEvent e)

Description copied from class: ComponentAdapter

Invoked when the component's position changes.

Specified by:
componentMoved in interface ComponentListener
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

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https://docs.oracle.com/javase/8/docs/api/javax/swing/plaf/basic/BasicTreeUI.ComponentHandler.html