toolbartest.java

Java编程例子(全新)演示基础的Java 功能,例如类,对象的使用,过程的调用,.

/**
   @version 1.12 2004-05-06
   @author Cay Horstmann
*/

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

public class ToolBarTest
{
   public static void main(String[] args)
   {  
      ToolBarFrame frame = new ToolBarFrame();
      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      frame.setVisible(true);
   }
}

/**
   A frame with a toolbar and menu for color changes.
*/
class ToolBarFrame extends JFrame
{  
   public ToolBarFrame()
   {  
      setTitle("ToolBarTest");
      setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);

      // add a panel for color change

      panel = new JPanel();

      // set up actions

      Action blueAction = new ColorAction("Blue", 
         new ImageIcon("blue-ball.gif"), Color.BLUE);
      Action yellowAction = new ColorAction("Yellow",
         new ImageIcon("yellow-ball.gif"), Color.YELLOW);
      Action redAction = new ColorAction("Red",
         new ImageIcon("red-ball.gif"), Color.RED);

      Action exitAction = new 
         AbstractAction("Exit", new ImageIcon("exit.gif"))
         {  
            public void actionPerformed(ActionEvent event)
            {  
               System.exit(0);
            }
         };
      exitAction.putValue(Action.SHORT_DESCRIPTION, "Exit");

      // populate tool bar

      JToolBar bar = new JToolBar();
      bar.add(blueAction);
      bar.add(yellowAction);
      bar.add(redAction);
      bar.addSeparator();
      bar.add(exitAction);
      add(bar, BorderLayout.NORTH);

      // populate menu

      JMenu menu = new JMenu("Color");
      menu.add(yellowAction);
      menu.add(blueAction);
      menu.add(redAction);
      menu.add(exitAction);
      JMenuBar menuBar = new JMenuBar();
      menuBar.add(menu);
      setJMenuBar(menuBar);
   }

   public static final int DEFAULT_WIDTH = 300;
   public static final int DEFAULT_HEIGHT = 200;  

   private JPanel panel;

   /** 
      The color action sets the background of the frame to a
      given color.
   */
   class ColorAction extends AbstractAction
   {  
      public ColorAction(String name, Icon icon, Color c)
      {  
         putValue(Action.NAME, name);
         putValue(Action.SMALL_ICON, icon);
         putValue(Action.SHORT_DESCRIPTION, name + " background");
         putValue("Color", c);
      }

      public void actionPerformed(ActionEvent event)
      {  
         Color c = (Color) getValue("Color");
         panel.setBackground(c);
      }
   }
}