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 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 Description
ComponentHandler()

Methods

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

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

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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https://docs.oracle.com/en/java/javase/11/docs/api/java.desktop/javax/swing/plaf/basic/BasicTreeUI.ComponentHandler.html