stylechooser.java~99~

提供了常用的JAVA技术的示例

// 13-4 构 造 swing 不 同 显 示 风 格 。
package StyleChooser;

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.ImageIcon;
import javax.swing.border.*;
import javax.swing.UIManager;

public class StyleChooser extends JPanel{
    static JFrame frame;
    static String metal="Metal";
    static String metalClassName="javax.swing.plaf.metal.MetalLookAndFeel";

    static String motif="Motif";
    static String motifClassName="com.sun.java.swing.plaf.motif.MotifLookAndFeel";

    static String windows="windows";
    static String windowsClassName="com.sun.java.swing.plaf.windows.WindowsLookAndFeel";

    JRadioButton motifButton=new JRadioButton(motif),
                 metalButton=new JRadioButton(metal),
                 windowsButton=new JRadioButton(windows);

    JLabel label=new JLabel("the styles of swing has ");

    public StyleChooser(){
        metalButton.setMnemonic(KeyEvent.VK_E);
        metalButton.setActionCommand(metalClassName);
        motifButton.setMnemonic('M');
        motifButton.setActionCommand(motifClassName);
        windowsButton.setMnemonic('w');
        windowsButton.setActionCommand(windowsClassName);

        // 归 为 一 组
        ButtonGroup group=new ButtonGroup();
        group.add(motifButton);
        group.add(metalButton);
        group.add(windowsButton);
        //windowsButton.setSelected(true);
       // group.setSelected(new DefaultButtonModel(),true);

        // 监 听
        RadioListener myListener=new RadioListener();
        motifButton.addActionListener(myListener);
        metalButton.addActionListener(myListener);
        windowsButton.addActionListener(myListener);

        add(label);
        add(motifButton);
        add(metalButton);
        add(windowsButton);
    }

    class RadioListener implements ActionListener{
        public void actionPerformed(ActionEvent e){
            String InfName=e.getActionCommand();
            try{
                UIManager.setLookAndFeel(InfName);
                SwingUtilities.updateComponentTreeUI(frame);
                System.out.println("InfName="+InfName);
                frame.pack();
                updateState();
            }
            catch(Exception ee){
                JRadioButton button=(JRadioButton)e.getSource();
                button.setEnabled(false);
                updateState();
                System.err.println("error info :"+ee.getMessage());
                System.err.println("could not load lookandfeel:"+InfName);
            }
        }
    }

    public void updateState(){
        String InfName=UIManager.getLookAndFeel().getClass().getName();
        System.out.println("indexOf(motif)="+InfName.indexOf(motif));
        System.out.println("indexOf(metal)="+InfName.indexOf(metal));
        System.out.println("indexOf(windows)="+InfName.indexOf(windows));
        if(InfName.indexOf(metal)>=0){
            metalButton.setSelected(true);
        }else if(InfName.indexOf(windows)>=0){
            windowsButton.setSelected(true);
        }else if(InfName.indexOf(motif)>=0){
            motifButton.setSelected(true);
        }else{
            System.err.println("StyleChooser is using an unknown:"+InfName);
        }
    }

    public static void main(String[] args) {
      StyleChooser panel = new StyleChooser();
      frame=new JFrame("StyleChooser");
      frame.addWindowListener(new WindowAdapter(){
        public void windowClosing(WindowEvent e){
          System.exit(0);
      }
      });


      frame.getContentPane().add("Center",panel);
      frame.pack();
      //frame.setVisible(true);
      frame.show();
      panel.updateState();
  }
}