{
/*
* 构造方法
*/
public KeyListener(String actionName,Color c)
{
putValue(Action.NAME,actionName); //动作名
putValue(Action.SHORT_DESCRIPTION,"改变背景"); //这个字符串会出现在工具栏或按钮上，做为一个prompt
putValue("color",c); //把Color对象存储到"color"中,名/值对应
}
/*
* 改变背景颜色
* @see java.awt.event.ActionListener#actionPerformed(java.awt.event.ActionEvent)
*/
public void actionPerformed(ActionEvent e)
{
Color c = (Color)getValue("color"); //取出Color
mainPanel.setBackground(c); //改变背景颜色
}
}
}
package cn.youthol;
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
public class Main
{
/**
* @param args
*/
public static void main(String[] args)
{
EventQueue.invokeLater(new Runnable()
{
public void run()
{
MyFrame f = new MyFrame("改变背景颜色");
f.setDefaultCloseOperation(MyFrame.EXIT_ON_CLOSE);
f.setVisible(true);
}
});
}
}
/**
* 框架窗口
*/
class MyFrame extends JFrame
{
private JPanel mainPanel;
private final int WINDOW_WIDTH = 800;
private final int WINDOW_HEIGHT = 600;
private static String yellow = "toYellow";
private static String blue = "toBlue";
private static String black = "toBlack";
public MyFrame(String title)
{
super(title);
setSize(WINDOW_WIDTH,WINDOW_HEIGHT);
mainPanel = new JPanel();
add(mainPanel);
//设置Button和动作监听器
setComponents();
}
private void setComponents()
{
//创建监听器
Action yellowListener = new KeyListener("Yellow",Color.YELLOW);
Action blackListener = new KeyListener("Black",Color.BLACK);
Action blueListener = new KeyListener("Blue",Color.BLUE);
//创建Button
JButton btnYellow = new JButton(yellowListener);
JButton btnBlack = new JButton(blackListener);
JButton btnBlue = new JButton(blueListener);
//添加Button
mainPanel.add(btnYellow);
mainPanel.add(btnBlack);
mainPanel.add(btnBlue);
//设置Map
InputMap imap = mainPanel.getInputMap(JComponent.WHEN_ANCESTOR_OF_FOCUSED_COMPONENT);
imap.put(KeyStroke.getKeyStroke("ctrl Y"), MyFrame.yellow);
imap.put(KeyStroke.getKeyStroke("ctrl B"), MyFrame.blue);
imap.put(KeyStroke.getKeyStroke("ctrl L"), MyFrame.black);
ActionMap amap = mainPanel.getActionMap();
amap.put(MyFrame.yellow, yellowListener);
amap.put(MyFrame.blue, blueListener);
amap.put(MyFrame.black, blackListener);
}
/*
* 监听器类
*/
private class KeyListener extends AbstractAction
{
/*
* 构造方法
*/
public KeyListener(String actionName,Color c)
{
putValue(Action.NAME,actionName); //动作名
putValue(Action.SHORT_DESCRIPTION,"改变背景"); //这个字符串会出现在工具栏或按钮上，做为一个prompt
putValue("color",c); //把Color对象存储到"color"中,名/值对应
}
/*
* 改变背景颜色
* @see java.awt.event.ActionListener#actionPerformed(java.awt.event.ActionEvent)
*/
public void actionPerformed(ActionEvent e)
{
Color c = (Color)getValue("color"); //取出Color
mainPanel.setBackground(c); //改变背景颜色
}
}
}