mousetracker.java

经典的<<C how to program>一书第三版的例程。非常适合于C的初学者。

// Fig. 29.17: MouseTracker.java
// Demonstrating mouse events.

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class MouseTracker extends JFrame
             implements MouseListener, MouseMotionListener {
   private JLabel statusBar;

   public MouseTracker()
   {
      super( "Demonstrating Mouse Events" );

      statusBar = new JLabel();
      getContentPane().add( statusBar, BorderLayout.SOUTH );
    
      // application listens to its own mouse events
      addMouseListener( this );
      addMouseMotionListener( this );

      setSize( 275, 100 );
      show();
   }

   // MouseListener event handlers
   public void mouseClicked( MouseEvent e )
   {
      statusBar.setText( "Clicked at [" + e.getX() +
                         ", " + e.getY() + "]" );
   }

   public void mousePressed( MouseEvent e )
   {
      statusBar.setText( "Pressed at [" + e.getX() +
                         ", " + e.getY() + "]" );
   }

   public void mouseReleased( MouseEvent e )
   {
      statusBar.setText( "Released at [" + e.getX() +
                         ", " + e.getY() + "]" );
   }

   public void mouseEntered( MouseEvent e )
   {
      statusBar.setText( "Mouse in window" );
   }

   public void mouseExited( MouseEvent e )
   {
      statusBar.setText( "Mouse outside window" );
   }

   // MouseMotionListener event handlers
   public void mouseDragged( MouseEvent e )
   {
      statusBar.setText( "Dragged at [" + e.getX() +
                         ", " + e.getY() + "]" );
   }

   public void mouseMoved( MouseEvent e )
   {
      statusBar.setText( "Moved at [" + e.getX() +
                         ", " + e.getY() + "]" );
   }

   public static void main( String args[] )
   { 
      MouseTracker app = new MouseTracker();

      app.addWindowListener(
         new WindowAdapter() {
            public void windowClosing( WindowEvent e )
            {
               System.exit( 0 );
            }
         }
      );
   }
}

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 * (C) Copyright 2000 by Deitel & Associates, Inc. and Prentice Hall.     *
 * All Rights Reserved.                                                   *
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