BasicScrollBarUI.TrackListener (Java 2 Platform SE v1.4.2) - Java 2 SDK v1.4.2, Java 2 SDK 英文文档

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Java^TM 2 Platform
Std. Ed. v1.4.2

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javax.swing.plaf.basic
Class BasicScrollBarUI.TrackListener

java.lang.Object
  java.awt.event.MouseAdapter
      javax.swing.plaf.basic.BasicScrollBarUI.TrackListener

All Implemented Interfaces:: EventListener, MouseListener, MouseMotionListener

Enclosing class:: BasicScrollBarUI

protected class BasicScrollBarUI.TrackListener
extends MouseAdapter
implements MouseMotionListener

Track mouse drags.

Field Summary

protected int currentMouseX


protected int currentMouseY


protected int offset


Constructor Summary

protected BasicScrollBarUI.TrackListener()


Method Summary

void mouseDragged(MouseEvent e)
          Set the models value to the position of the thumb's top of Vertical scrollbar, or the left/right of Horizontal scrollbar in left-to-right/right-to-left scrollbar relative to the origin of the track.

void mouseMoved(MouseEvent e)
          Invoked when the mouse cursor has been moved onto a component but no buttons have been pushed.

void mousePressed(MouseEvent e)
          If the mouse is pressed above the "thumb" component then reduce the scrollbars value by one page ("page up"), otherwise increase it by one page.

void mouseReleased(MouseEvent e)
          Invoked when a mouse button has been released on a component.

Methods inherited from class java.awt.event.MouseAdapter

mouseClicked, mouseEntered, mouseExited

Methods inherited from class java.lang.Object

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

Field Detail

offset

protected transient int offset

currentMouseX

protected transient int currentMouseX

currentMouseY

protected transient int currentMouseY

Constructor Detail

BasicScrollBarUI.TrackListener

protected BasicScrollBarUI.TrackListener()

Method Detail

mouseReleased

public void mouseReleased(MouseEvent e)

Description copied from class: MouseAdapter

Invoked when a mouse button has been released on a component.

Specified by:: mouseReleased in interface MouseListener
Overrides:: mouseReleased in class MouseAdapter

mousePressed

public void mousePressed(MouseEvent e)

If the mouse is pressed above the "thumb" component then reduce the scrollbars value by one page ("page up"), otherwise increase it by one page. If there is no thumb then page up if the mouse is in the upper half of the track.

Specified by:: mousePressed in interface MouseListener
Overrides:: mousePressed in class MouseAdapter

mouseDragged

public void mouseDragged(MouseEvent e)

Set the models value to the position of the thumb's top of Vertical scrollbar, or the left/right of Horizontal scrollbar in left-to-right/right-to-left scrollbar relative to the origin of the track.

Specified by:: mouseDragged in interface MouseMotionListener

mouseMoved

public void mouseMoved(MouseEvent e)

Description copied from interface: MouseMotionListener

Invoked when the mouse cursor has been moved onto a component but no buttons have been pushed.

Specified by:: mouseMoved in interface MouseMotionListener