mousedetails.java

来自「java 课件与资料 java 课件与资料 java 课件与资料 java 课件」· Java 代码 · 共 65 行

// Fig. 13.20: MouseDetails.java
// Demonstrating mouse clicks and distinguishing between mouse buttons.
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class MouseDetails extends JFrame {
   private int xPos, yPos;

   // set title bar String; register mouse listener; size and show window
   public MouseDetails()
   {
      super( "Mouse clicks and buttons" );

      addMouseListener( new MouseClickHandler() ); 

      setSize( 350, 150 );
      setVisible( true );
   }

   // draw String at location where mouse was clicked
   public void paint( Graphics g )
   {
      // call superclass paint method
      super.paint( g );

      g.drawString( "Clicked @ [" + xPos + ", " + yPos + "]", 
         xPos, yPos );
   }

   public static void main( String args[] )
   {
      MouseDetails application = new MouseDetails();
      application.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
   }

   // inner class to handle mouse events
   private class MouseClickHandler extends MouseAdapter {

      // handle mouse click event and determine which button was pressed
      public void mouseClicked( MouseEvent event )
      {
         xPos = event.getX();
         yPos = event.getY();

         String title = "Clicked " + event.getClickCount() + " time(s)";
      
         if ( event.isMetaDown() )  // right mouse button   
            title += " with right mouse button";
      
         else if ( event.isAltDown() )  // middle mouse button
            title += " with center mouse button";
      
         else  // left mouse button                       
            title += " with left mouse button";

         setTitle( title );  // set title bar of window
         repaint();

      } // end method mouseClicked

   } // end private inner class MouseClickHandler

} // end class MouseDetails