一个封装了Java改变LookAndFeel的JAVA菜单，可直…

2008-02-23 09:33:30来源：互联网阅读 ()

package com.qiu.demo;

import Java.awt.*;
import javax.Swing.*;
import java.awt.event.*;

/**
* 一个封装了LookAndFeel子菜单可用于改变组件的LookAndFeel 这些LookAndFeel是JRE自带的 LookAndFeel
* 这些组件必须与一个父组件的相关联，才可更新LookAndFeel
*
* @author QIU_BaiChao
*/
public class JLookAndFeelMenu extends JMenu {
/**
* 默认的菜单名
*/
private static final String defaultMenuName = "LookAndFeel";

/**
* 得到系统的安装的所有LookAndFeel
*/
UIManager.LookAndFeelInfo[] info = UIManager.getInstalledLookAndFeels();

/**
* 按钮组,将一组LookAndFeel的单选按钮放在里面
*/
ButtonGroup buttonGroup = new ButtonGroup();

/**
* 父组件，更新LookAndFeel只能更新
* 在同一个父组件的LookAndFeel
*/
Component parent;

/**
* 构造函数
*
* @param menuName
* 菜单名
* @param parrent
* 父组件，将在同一个父组
* 件容器的所有Component更新LookAndFeel
*/
public JLookAndFeelMenu(String menuName, final Component parent) {
// 生成各个可以选择LookAndFeel的单选按钮子菜单
// generateLookAndFeelSubMenu(parent);
setParentComponent(parent);
// 设置菜单名
this.setText(menuName);
}

/**
* 构造函数使用默认的菜单名:LookAndFeel
*
* @param parent
* 父组件，将在同一个父组件容器的
* 所有Component更新LookAndFeel
*/
public JLookAndFeelMenu(Component parent) {
this(defaultMenuName, parent);
}

/**
* 默认构造函数使用默认的菜单名，
* 还需设置父组件方法
* 调用setParentComponent(Component parent)方法
*/
public JLookAndFeelMenu() {
super(defaultMenuName);
}

/**
* 生成LookAndFeel的单选子菜单
*
* @param parent
*/
private void generateLookAndFeelSubMenu(final Component parent) {
for (int i = 0; i < info.length; i ) {
JRadioButtonMenuItem item = new JRadioButtonMenuItem(info[i]
.getName(), i == 0);
final String className = info[i].getClassName();
// 增加事件处理
item.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evn) {
try {
UIManager.setLookAndFeel(className);
} catch (Exception e) {
e.printStackTrace();
}
// 更新组件的LookAndFeel
SwingUtilities.updateComponentTreeUI(parent);
}
});
buttonGroup.add(item);
add(item);
}
}

/**
* 得到父组件
*
* @return
*/
public Component getParentComponent() {
return parent;
}

/**
* 设置父组件
*
* @param parent
*/
public void setParentComponent(Component parent) {
this.parent = parent;
generateLookAndFeelSubMenu(parent);
}

/**
* 演示怎样使用这个LookAndFeel菜单
*/
public static void main(String[] args) {
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
// App.centerOfScreen(frame,400,300);
frame.setSize(400, 300);
frame.setLocation(200, 200);
JMenuBar bar = new JMenuBar();
// JMenu menu = new LookAndFeelMenu("外观选择",frame);
JLookAndFeelMenu menu = new JLookAndFeelMenu();
menu.setText("外观选择");
menu.setParentComponent(frame);
bar.add(menu);
frame.getContentPane().add(BorderLayout.NORTH, bar);
frame.getContentPane().add(BorderLayout.CENTER, new JButton("Hello"));
frame.setVisible(true);
}