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ActionFram.java
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92 lines (78 loc) · 2.84 KB
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package Chapter8Event;
import java.awt.Color;
import java.awt.Image;
import java.awt.event.ActionEvent;
import java.net.URL;
import javax.swing.AbstractAction;
import javax.swing.Action;
import javax.swing.ActionMap;
import javax.swing.Icon;
import javax.swing.ImageIcon;
import javax.swing.InputMap;
import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.KeyStroke;
/*
* 多个动作触发事件
*
* 主要类或接口：AbstractAction，KeyStroke，InputMap，ActionMap
*
* */
public class ActionFram extends JFrame{
private JPanel buttonPanel;
private static int DEFAULT_WIDTH=300;
private static int DEFAULT_HEIGHT=200;
//Action接口：封装命令,连接到多个事件源。一个动作是一个对象（命令的说明，执行命令需要的参数：例如例子中的需要的颜色）
//Action接口中有8个个预定义动作
//Action接口扩展于ActionListener接口
//AbstractAction：实现了Action接口中除actionPerformed外的所有方法。多个相关动作可以使用同一个类
//存储所有的名/值 队
public ActionFram(){
buttonPanel=new JPanel();
ColorAction ActionYellow=new ColorAction("Yellow", new ImageIcon("yellow.gif"), Color.yellow);
ColorAction ActionBlue=new ColorAction("Blue", new ImageIcon("blue.gif"), Color.blue);
ColorAction ActionRed=new ColorAction("Red", new ImageIcon("red.gif"), Color.red);
createButton(ActionYellow);
createButton(ActionBlue);
createButton(ActionRed);
this.setSize(DEFAULT_WIDTH,DEFAULT_HEIGHT);
this.add(buttonPanel);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setVisible(true);
//*****************得到图片资源
URL url=this.getClass().getResource("blue.gif");
this.setIconImage(new ImageIcon(url).getImage());
//InputMap先将按键对象（KeyStroke）映射到任意对象上
//再由ActionMap类实现将对象映射到动作上的第二个映射（这样应该和输入映射条件有关）
//WHEN_ANCESTOR_OF_FOCUSED_COMPONENT：当这个组件包含了拥有键盘焦点的组件时
InputMap imap=buttonPanel.getInputMap(JComponent.WHEN_ANCESTOR_OF_FOCUSED_COMPONENT);
imap.put(KeyStroke.getKeyStroke("ctrl Y"),"panel.yellow");
imap.put(KeyStroke.getKeyStroke("ctrl B"),"panel.blue");
imap.put(KeyStroke.getKeyStroke("ctrl R"), "panel.red");
ActionMap amap=buttonPanel.getActionMap();
amap.put("panel.yellow", ActionYellow);
amap.put("panel.blue",ActionBlue);
amap.put("panel.red",ActionRed);
}
public void createButton(Action colorAction){
JButton button= new JButton(colorAction);
buttonPanel.add(button);
}
//内部类处理事件
public class ColorAction extends AbstractAction{
public ColorAction(String name,Icon icon,Color c){
putValue(Action.NAME, name);
putValue(Action.SMALL_ICON, icon);
putValue("color",c);
}
public void actionPerformed(ActionEvent e) {
Color bg=(Color) getValue("color");
buttonPanel.setBackground(bg);
}
}
public static void main(String[] args) {
new ActionFram();
}
}