Java Tutorial/Swing Event/MouseMotionListener

Demonstrates mouse motion events

   <source lang="java">

import java.awt.event.MouseEvent; import java.awt.event.MouseMotionListener; import javax.swing.JFrame; import javax.swing.JLabel; class CustomListener implements MouseMotionListener {

 public void mouseMoved(MouseEvent me) {
   System.out.println("mouseMoved");
 }
 public void mouseDragged(MouseEvent me) {
   System.out.println("mouseDragged");
 }

} public class MouseMotionListenerDemo {

 public static void main(String[] a) {
   JFrame frame = new JFrame("Popup JComboBox");
   frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   JLabel label = new JLabel();
   label.addMouseMotionListener(new CustomListener() {
   });
   frame.add(label);
   frame.setSize(300, 200);
   frame.setVisible(true);
 }

}</source>

Handle mouse motion event

   <source lang="java">

import java.awt.event.MouseEvent; import java.awt.event.MouseMotionAdapter; import javax.swing.JFrame; import javax.swing.JTextArea; public class Main extends JFrame {

 public Main() {
   setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   setSize(400, 400);
   JTextArea textArea = new JTextArea("drag it...");
   textArea.addMouseMotionListener(new MouseMotionAdapter() {
     public void mouseDragged(MouseEvent e) {
       System.out.println("Mouse Dragged...");
     }
     public void mouseMoved(MouseEvent e) {
       System.out.println("Mouse Moved...");
     }
   });
   getContentPane().add(textArea);
 }
 public static void main(String[] args) {
   new Main().setVisible(true);
 }

}</source>

How to Write a Mouse-Motion Listener

   <source lang="java">

/*

*
* Copyright (c) 1998 Sun Microsystems, Inc. All Rights Reserved.
*
* Sun grants you ("Licensee") a non-exclusive, royalty free, license to use,
* modify and redistribute this software in source and binary code form,
* provided that i) this copyright notice and license appear on all copies of
* the software; and ii) Licensee does not utilize the software in a manner
* which is disparaging to Sun.
*
* This software is provided "AS IS," without a warranty of any kind. ALL
* EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING ANY
* IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR
* NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN AND ITS LICENSORS SHALL NOT BE
* LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING
* OR DISTRIBUTING THE SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR ITS
* LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT,
* INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER
* CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF
* OR INABILITY TO USE SOFTWARE, EVEN IF SUN HAS BEEN ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGES.
*
* This software is not designed or intended for use in on-line control of
* aircraft, air traffic, aircraft navigation or aircraft communications; or in
* the design, construction, operation or maintenance of any nuclear
* facility. Licensee represents and warrants that it will not use or
* redistribute the Software for such purposes.
*/

import java.awt.BorderLayout; import java.awt.Color; import java.awt.Dimension; import java.awt.event.MouseEvent; import java.awt.event.MouseMotionListener; import javax.swing.BorderFactory; import javax.swing.JComponent; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JPanel; import javax.swing.JScrollPane; import javax.swing.JTextArea; public class MouseMotionEventDemo extends JPanel implements MouseMotionListener {

 BlankArea blankArea = new BlankArea(new Color(0.98f, 0.97f, 0.85f));
 JTextArea textArea = new JTextArea();
 public MouseMotionEventDemo() {
   super(new BorderLayout());
   add(blankArea,"North");
   
   textArea.setEditable(false);
   JScrollPane scrollPane = new JScrollPane(textArea, JScrollPane.VERTICAL_SCROLLBAR_ALWAYS,
       JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
   scrollPane.setPreferredSize(new Dimension(200, 75));
   add(scrollPane,"Center");
   // Register for mouse events on blankArea and panel.
   blankArea.addMouseMotionListener(this);
   addMouseMotionListener(this);
   setPreferredSize(new Dimension(450, 450));
   setBorder(BorderFactory.createEmptyBorder(20, 20, 20, 20));
 }
 public void mouseMoved(MouseEvent e) {
   saySomething("Mouse moved", e);
 }
 public void mouseDragged(MouseEvent e) {
   saySomething("Mouse dragged", e);
 }
 void saySomething(String eventDescription, MouseEvent e) {
   textArea.append(eventDescription + " (" + e.getX() + "," + e.getY() + ")" + " detected on "
       + e.getComponent().getClass().getName() + "\n");
   textArea.setCaretPosition(textArea.getDocument().getLength());
 }
 public static void main(String[] args) {
   JFrame frame = new JFrame("MouseMotionEventDemo");
   frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   // Create and set up the content pane.
   JComponent newContentPane = new MouseMotionEventDemo();
   newContentPane.setOpaque(true); // content panes must be opaque
   frame.setContentPane(newContentPane);
   // Display the window.
   frame.pack();
   frame.setVisible(true);
 }

} class BlankArea extends JLabel {

 Dimension minSize = new Dimension(100, 100);
 public BlankArea(Color color) {
   setBackground(color);
   setOpaque(true);
   setBorder(BorderFactory.createLineBorder(Color.black));
 }
 public Dimension getMinimumSize() {
   return minSize;
 }
 public Dimension getPreferredSize() {
   return minSize;
 }

}</source>

The MouseMotionListener Interface

This interface defines methods that are called when the mouse is moved or dragged with a button pressed.

Defined MethodsDescriptionmouseMoved(MouseEvent e)Called when the mouse is moved within a componentmouseDragged(MouseEvent e)Called when the mouse is moved within a component while a mouse button is held down