boxlayouttest.java

Java2核心技术卷一 配套源码,看了还不错

/**
 * @version 1.20 21 Aug 1998
 * @author Cay Horstmann
 */

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

public class BoxLayoutTest extends JFrame 
   implements ActionListener
{  public BoxLayoutTest()
   {  setTitle("BoxLayoutTest");
      setSize(300, 200);
      addWindowListener(new WindowAdapter()
      {  public void windowClosing(WindowEvent e)
         {  System.exit(0);
         }
      } );


      horizontalBox = createBox(true, false);
      verticalBox = createBox(false, false);
      horizontalStrutsAndGlueBox = createBox(true, true);
      verticalStrutsAndGlueBox = createBox(false, true);
      
      JPanel panel = new JPanel();
      panel.setLayout(new GridLayout(3, 1));
      ButtonGroup directionGroup = new ButtonGroup();

      horizontalButton = addRadioButton(panel, 
         directionGroup, "Horizontal", true);
      verticalButton = addRadioButton(panel, 
         directionGroup, "Vertical", false);
      strutsAndGlueCheckBox = addCheckBox(panel, 
         "Struts and Glue");

      Container contentPane = getContentPane();
      contentPane.add(panel, "South");
      contentPane.add(horizontalBox, "Center");
      currentBox = horizontalBox;
   }

   public Box createBox(boolean horizontal, 
      boolean strutsAndGlue)
   {  Box b;
      if (horizontal)
         b = Box.createHorizontalBox();
      else
         b = Box.createVerticalBox();
      
      b.add(new JLabel("Name"));
      b.add(new JTextField());
      
      if (strutsAndGlue) 
         if (horizontal)
            b.add(Box.createHorizontalStrut(5));
         else
            b.add(Box.createVerticalStrut(5));

      b.add(new JLabel("Password"));
      b.add(new JTextField());

      if (strutsAndGlue) 
         b.add(Box.createGlue());

      b.add(new JButton("Ok"));
      
      return b;
   }

   public JRadioButton addRadioButton(JPanel p, 
      ButtonGroup g, String name, boolean selected)
   {  JRadioButton button 
         = new JRadioButton(name, selected);
      button.addActionListener(this);
      g.add(button);
      p.add(button);
      return button;
   }

   public JCheckBox addCheckBox(JPanel p, String name)
   {  JCheckBox checkBox = new JCheckBox(name);
      checkBox.addActionListener(this);
      p.add(checkBox);
      return checkBox;
   }
   
   public void actionPerformed(ActionEvent evt)
   {  Container contentPane = getContentPane();
      contentPane.remove(currentBox);

      if (horizontalButton.isSelected()) 
      {  if (strutsAndGlueCheckBox.isSelected())
            currentBox = horizontalStrutsAndGlueBox;
         else
            currentBox = horizontalBox;
      }
      else               
      {  if (strutsAndGlueCheckBox.isSelected())
            currentBox = verticalStrutsAndGlueBox;
         else
            currentBox = verticalBox;
      }
         
      contentPane.add(currentBox, "Center");
      contentPane.validate(); // force layout
      repaint();
   }

   public static void main(String[] args)
   {  Frame f = new BoxLayoutTest();
      f.show();  
   }
   
   private Box horizontalBox;
   private Box verticalBox;
   private Box horizontalStrutsAndGlueBox;
   private Box verticalStrutsAndGlueBox;
   private Box currentBox;
   
   private JCheckBox strutsAndGlueCheckBox;
   private JRadioButton horizontalButton;
   private JRadioButton verticalButton;
}