java 动作与键盘事件的对应 ActionEvent InputMap KeyStroke

import java.awt.BorderLayout;

import java.awt.Color;

import java.awt.GridLayout;

import java.awt.event.ActionEvent;

import java.awt.event.InputEvent;

import java.awt.event.KeyEvent;


import javax.swing.AbstractAction;

import javax.swing.Action;

import javax.swing.ActionMap;

import javax.swing.InputMap;

import javax.swing.JButton;

import javax.swing.JComponent;

import javax.swing.JFrame;

import javax.swing.JPanel;

import javax.swing.KeyStroke;


/*

 * 3个按钮一个面板

 * 点击不同按钮 面板呈现不同颜色

 * 增加功能:按键盘ctrl+y    alt+g    r面板也会变色

 * 

 * 动作与键盘事件的对应

 */

public class ActionEventDemo2 extends JFrame{

 

 JPanel ChangeColorPanel;

 

 public ActionEventDemo2() {

 JPanel buttonPanel = new JPanel();//放button的面板

 ChangeColorPanel =new JPanel();//此面板颜色会变

 /*创建Action对象*/

 Action yelloChane=new PanelColorChange("yellowButton", Color.YELLOW);

 Action redChane = new PanelColorChange("redButton", Color.RED);

 Action greenChane = new PanelColorChange("greenButton", Color.GREEN);

 GridLayout gridLayout=new GridLayout(1, 3);

 buttonPanel.setLayout(gridLayout);

 buttonPanel.add(new JButton(yelloChane));//yelloChane是AbstractAction子类对象 相当于注册了ActionEvent事件

 buttonPanel.add(new JButton(redChane));//将事件当做参数再定义组件时就传递过去 省了addXXXListener和继承XXXListenner的过程

 buttonPanel.add(new JButton(greenChane));

 

 //动作与键盘事件相对应

 //键盘与对象建立联系

 InputMap inputMap=buttonPanel.getInputMap(JComponent.WHEN_ANCESTOR_OF_FOCUSED_COMPONENT);

 inputMap.put(KeyStroke.getKeyStroke("ctrl Y"), "yello");//组合件ctrl+Y Y一定要大写ctrl的c一定要小写

 inputMap.put(KeyStroke.getKeyStroke(KeyEvent.VK_G,InputEvent.ALT_MASK), "green");//组合键alt+g

 inputMap.put(KeyStroke.getKeyStroke('r'), "red");

 //动作与对象建立联系

 ActionMap actionMap=buttonPanel.getActionMap();

 actionMap.put("yello", yelloChane);

 actionMap.put("red", redChane);

 actionMap.put("green", greenChane);

 //联系建立结束 最终效果=》键盘与动作建立了联系

 /*

  * 上面代码 inputMap利用getKeyStroke('y')将键盘y与对象"yello"对应   

  * actionMap又将对象"yello"与动作yelloChane对应 

  * 从而键盘'y'就与动作yelloChane对应了

  * 其余同理

  */

 

 

 add(buttonPanel);

 BorderLayout borderLayout=new BorderLayout();

 add(buttonPanel,BorderLayout.NORTH);

 add(ChangeColorPanel,borderLayout.CENTER);

 

 }



 public static void main(String[] args) {

 ActionEventDemo2 aed=new ActionEventDemo2();

 aed.setSize(500, 300);

 aed.setResizable(false);

 aed.setLocationRelativeTo(null);

 aed.setVisible(true);

 aed.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

 }

 

 class PanelColorChange extends AbstractAction{

 private String name="";//表示按钮名称的变量

 private Color color=null;//表示颜色变化的变量

 /*构造方法*/

 public PanelColorChange(String name, Color color) {

 super();

 this.name = name;

 this.color = color;

 //这就是事件监听器  putValue产生鼠标放上去会有提示文本的事件

 putValue(Action.NAME, name);

 putValue(Action.SHORT_DESCRIPTION, "单击该按钮颜色将变为"+color);

 

 }

 

 @Override

 public void actionPerformed(ActionEvent e) {

 ChangeColorPanel.setBackground(color);//设置面板颜色为color color由构造函数传递进来

 }
 

 

 }


}