Java Swing中的键盘事件处理

来源：yesky 作者：郗旻出处：巧巧读书 2006-06-03 进入讨论组

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swing
java
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　　附：主要程序代码：

import java.awt.*;
import javax.swing.*;
import com.borland.jbcl.layout.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import com.sun.java.swing.plaf.motif.*;

public class EventPanel extends JPanel implements ActionListener
{
　JButton btnYellow = new JButton();
　JButton btnBlue = new JButton();
　JButton btnRed = new JButton();
　JPanel parentPanel = new JPanel();
　JPanel sonPanel = new JPanel();
　XYLayout xYLayout1 = new XYLayout();
　JButton son = new JButton();
　JButton parent = new JButton();
　public EventPanel()
　{
　　try{
　　　jbInit();
　　}catch(Exception ex)
　　{ ex.printStackTrace(); }
　　}
　void jbInit() throws Exception
　{
　　btnYellow.setText("Yellow");
　　btnYellow.setBounds(new Rectangle(35, 23, 97, 29));
　　this.setLayout(null);
　　btnBlue.setBounds(new Rectangle(154, 21, 97, 29));
　　btnBlue.setText("Blue");
　　btnRed.setBounds(new Rectangle(272, 24, 97, 29));
　　btnRed.setText("Red");
　　parentPanel.setBorder(BorderFactory.createRaisedBevelBorder());
　　parentPanel.setBounds(new Rectangle(27, 68, 358, 227));
　　parentPanel.setLayout(xYLayout1);
　　sonPanel.setBorder(BorderFactory.createLoweredBevelBorder());
　　son.setText("son");
　　parent.setText("parent");
　　this.add(btnYellow, null);
　　this.add(btnBlue, null);
　　this.add(btnRed, null);
　　this.add(parentPanel, null);
　　parentPanel.add(sonPanel, new XYConstraints(58, 22, 229, 125));
　　sonPanel.add(son, null);
　　parentPanel.add(parent, new XYConstraints(150, 167, -1, -1));
　　btnYellow.addActionListener(this);
　　btnRed.addActionListener(this);
　　btnBlue.addActionListener(this);

　　InputMap focusIm,focusFatherIm,ancestorIm,windowIm;
　　ActionMap am;
　　//create four TextAction for diff purpose
　　TextAction whenFocusSon = new TextAction("focus son");
　　TextAction whenFocusFather = new TextAction("focus father");
　　TextAction window = new TextAction("window");
　　TextAction ancestor = new TextAction("ancestor");
　　//get default inputMap (when focus inputmap) and set a parent InputMap
　　focusIm = son.getInputMap();
　　focusFatherIm = new InputMap();
　　focusIm.setParent(focusFatherIm);
　　//get WHEN_ANCESTOR_OF_FOCUSED_COMPONENT inputMap
　　ancestorIm = son.getInputMap(WHEN_ANCESTOR_OF_FOCUSED_COMPONENT);
　　//get WHEN_IN_FOCUSED_WINDOW inputMap
　　windowIm = son.getInputMap(WHEN_IN_FOCUSED_WINDOW);
　　//put the keyStroke to the InputMap
　　focusIm.put(KeyStroke.getKeyStroke('f'),"actionFocusSon");
　　focusFatherIm.put(KeyStroke.getKeyStroke('F'),"actionFocusFather");
　　ancestorIm.put(KeyStroke.getKeyStroke('a'),"actionAncestor");
　　windowIm.put(KeyStroke.getKeyStroke('w'),"actionWindow");
　　//get the actionMap
　　am = son.getActionMap();
　　am.put("actionFocusSon",whenFocusSon);
　　am.put("actionFocusFather",whenFocusFather);
　　am.put("actionAncestor",ancestor);
　　am.put("actionWindow",window);
　}
　public void actionPerformed(ActionEvent e)
　{
　　//this code is used to change the backgracolor
　　Object source=e.getSource();
　　Color color=null;//=getBackground();
　　if (source==btnYellow) color=Color.yellow;
　　else if (source==btnRed) color = Color.red;
　　else if (source == btnBlue) color = Color.blue;
　　setBackground(color);
　　repaint();
　}
}