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/OpenJDK 21

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

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

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

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Documentation extracted from Debian's OpenJDK Development Kit package.
Licensed under the GNU General Public License, version 2, with the Classpath Exception.
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https://docs.oracle.com/en/java/javase/21/docs/api/java.desktop/javax/swing/plaf/basic/BasicTreeUI.ComponentHandler.html