MouseTracker

// Fig. 14.29: MouseTrackerFrame.java
// Testing MouseTrackerFrame.
import javax.swing.JFrame;

public class MouseTracker 
{
   public static void main( String[] args )
   { 
      MouseTrackerFrame mouseTrackerFrame = new MouseTrackerFrame(); 
      mouseTrackerFrame.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
      mouseTrackerFrame.setSize( 300, 100 ); // set frame size
      mouseTrackerFrame.setVisible( true ); // display frame
   } // end main
} // end class MouseTracker

// Fig. 14.28: MouseTrackerFrame.java
// Demonstrating mouse events.
import java.awt.Color;
import java.awt.BorderLayout;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;
import java.awt.event.MouseEvent;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;

public class MouseTrackerFrame extends JFrame
{
   private JPanel mousePanel; // panel in which mouse events will occur
   private JLabel statusBar; // label that displays event information

   // MouseTrackerFrame constructor sets up GUI and 
   // registers mouse event handlers
   public MouseTrackerFrame()
   {
      super( "Demonstrating Mouse Events" );

      mousePanel = new JPanel(); // create panel
      mousePanel.setBackground( Color.WHITE ); // set background color
      add( mousePanel, BorderLayout.CENTER ); // add panel to JFrame

      statusBar = new JLabel( "Mouse outside JPanel" ); 
      add( statusBar, BorderLayout.SOUTH ); // add label to JFrame

      // create and register listener for mouse and mouse motion events
      MouseHandler handler = new MouseHandler(); 
      mousePanel.addMouseListener( handler ); 
      mousePanel.addMouseMotionListener( handler ); 
   } // end MouseTrackerFrame constructor

   private class MouseHandler implements MouseListener, 
      MouseMotionListener 
   {
      // MouseListener event handlers
      // handle event when mouse released immediately after press
      public void mouseClicked( MouseEvent event )
      {
         statusBar.setText( String.format( "Clicked at [%d, %d]", 
            event.getX(), event.getY() ) );
      } // end method mouseClicked

      // handle event when mouse pressed
      public void mousePressed( MouseEvent event )
      {
         statusBar.setText( String.format( "Pressed at [%d, %d]", 
            event.getX(), event.getY() ) );
      } // end method mousePressed

      // handle event when mouse released 
      public void mouseReleased( MouseEvent event )
      {
         statusBar.setText( String.format( "Released at [%d, %d]", 
            event.getX(), event.getY() ) );
      } // end method mouseReleased

      // handle event when mouse enters area
      public void mouseEntered( MouseEvent event )
      {
         statusBar.setText( String.format( "Mouse entered at [%d, %d]", 
            event.getX(), event.getY() ) );
         mousePanel.setBackground( Color.GREEN );
      } // end method mouseEntered

      // handle event when mouse exits area
      public void mouseExited( MouseEvent event )
      {
         statusBar.setText( "Mouse outside JPanel" );
         mousePanel.setBackground( Color.WHITE );
      } // end method mouseExited

      // MouseMotionListener event handlers
      // handle event when user drags mouse with button pressed
      public void mouseDragged( MouseEvent event )
      {
         statusBar.setText( String.format( "Dragged at [%d, %d]", 
            event.getX(), event.getY() ) );
      } // end method mouseDragged

      // handle event when user moves mouse
      public void mouseMoved( MouseEvent event )
      {
         statusBar.setText( String.format( "Moved at [%d, %d]", 
            event.getX(), event.getY() ) );
      } // end method mouseMoved
   } // end inner class MouseHandler
} // end class MouseTrackerFrame