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Class BasicScrollBarUI.TrackListener

java.lang.Object
java.awt.event.MouseAdapter
javax.swing.plaf.basic.BasicScrollBarUI.TrackListener
All Implemented Interfaces:
MouseListener, MouseMotionListener, MouseWheelListener, EventListener
Enclosing class:
BasicScrollBarUI
protected class BasicScrollBarUI.TrackListener extends MouseAdapter implements MouseMotionListener
Track mouse drags.

Field Summary

Modifier and Type Field Description
protected int currentMouseX
Current mouse x position
protected int currentMouseY
Current mouse y position
protected int offset
The offset

Constructor Summary

TrackListener()
Modifier Constructor Description
protected
Constructs a TrackListener.

Method Summary

Modifier and Type Method Description
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 mouseExited(MouseEvent e)
Invoked when the mouse exits the scrollbar.
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.

Methods declared in class java.awt.event.MouseAdapter

mouseClicked, mouseEntered, mouseMoved, mouseReleased, mouseWheelMoved

Methods declared in class java.lang.Object

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

Field Details

offset

protected transient int offset
The offset

currentMouseX

protected transient int currentMouseX
Current mouse x position

currentMouseY

protected transient int currentMouseY
Current mouse y position

Constructor Details

TrackListener

protected TrackListener()
Constructs a TrackListener.

Method Details

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
Parameters:
e - the event to be processed

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
Overrides:
mouseDragged in class MouseAdapter
Parameters:
e - the event to be processed

mouseMoved

public void mouseMoved(MouseEvent e)
Invoked when the mouse cursor has been moved onto a component but no buttons have been pushed.
Specified by:
mouseMoved in interface MouseMotionListener
Overrides:
mouseMoved in class MouseAdapter
Parameters:
e - the event to be processed

mouseExited

public void mouseExited(MouseEvent e)
Invoked when the mouse exits the scrollbar.
Specified by:
mouseExited in interface MouseListener
Parameters:
e - MouseEvent further describing the event
Since:
1.5

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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.
Various third party code in OpenJDK is licensed under different licenses (see Debian package).
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https://docs.oracle.com/en/java/javase/21/docs/api/java.desktop/javax/swing/plaf/basic/BasicScrollBarUI.TrackListener.html