import java.awt.AWTEvent;
import java.awt.Component;
import java.awt.Toolkit;
import java.awt.event.AWTEventListener;
import java.awt.event.KeyEvent;
import java.util.Arrays;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
public class ShortcutManager implements AWTEventListener {
// 使用單態(tài)模式
private static ShortcutManager instance = new ShortcutManager();
// 快捷鍵與事件處理對象鍵值對
private Map<String, ShortcutListener> listeners;
// 某組件上發(fā)生了快捷鍵列表中的快捷鍵事件, 如果他的父組件在被忽略組件列表中, 則放棄這個事件.
private Set<Component> ignoredComponents;
// 保存鍵盤上鍵與它的ascii碼對應
// 如果以某鍵的ascii碼為下標, 數(shù)組中此下標的值為true, 說明此鍵被按下了.
// 當此鍵被釋放開后, 數(shù)組中對應的值修改為false
private boolean[] keys;
private ShortcutManager() {
keys = new boolean[256];
ignoredComponents = new HashSet<Component>();
listeners = new HashMap<String, ShortcutListener>();
// 只關心鍵盤事件
Toolkit.getDefaultToolkit().addAWTEventListener(this, AWTEvent.KEY_EVENT_MASK);
}
/**
* 有鍵盤事件發(fā)生
*/
public void eventDispatched(AWTEvent event) {
if (event.getClass() == KeyEvent.class) {
KeyEvent ke = (KeyEvent) event;
if (ke.getID() == KeyEvent.KEY_PRESSED) {
keys[ke.getKeyCode()] = true;
// 查找快捷鍵對應的處理對象, 然后調用事件處理函數(shù)
String shortcut = searchShortcut();
ShortcutListener l = listeners.get(shortcut);
if (l != null && !isIgnored(event)) {
l.handle();
}
} else if (ke.getID() == KeyEvent.KEY_RELEASED) {
keys[ke.getKeyCode()] = false;
}
}
}
protected String searchShortcut() {
// 每個鍵之間用一個"."來隔開.
// 例如ctr + x的對應值為"17.88."
StringBuilder shortcut = new StringBuilder();
for (int i = 0; i < keys.length; ++i) {
if (keys[i]) {
shortcut.append(i).append(".");
}
}
// System.out.println(shortcut.toString());
return shortcut.toString();
}
/**
* 查找此快捷鍵事件是否要被拋棄
*
* @param event
* @return
*/
protected boolean isIgnored(AWTEvent event) {
if (!(event.getSource() instanceof Component)) {
return false;
}
boolean ignored = false;
for (Component com = (Component) event.getSource(); com != null; com = com.getParent()) {
if (ignoredComponents.contains(com)) {
ignored = true;
break;
}
}
return ignored;
}
public static ShortcutManager getInstance() {
return instance;
}
public void removeShortcutListener(ShortcutListener l) {
String tempKey = null;
for (Map.Entry<String, ShortcutListener> e : listeners.entrySet()) {
if (e.getValue().equals(l)) {
tempKey = e.getKey();
}
}
listeners.remove(tempKey);
}
public void addShortcutListener(ShortcutListener l, int... keys) {
// 快捷鍵的對應值按它們的鍵順序大小來進行創(chuàng)建
StringBuilder sb = new StringBuilder();
Arrays.sort(keys);
for (int i = 0; i < keys.length; ++i) {
if (0 < keys[i] && keys[i] < this.keys.length) {
sb.append(keys[i]).append(".");
} else {
System.out.println("Key is not valid");
return;
}
}
String shortcut = sb.toString();
// 如果還不存在, 則加入
if (listeners.containsKey(shortcut)) {
System.out.println("The shourt cut is already used.");
} else {
listeners.put(shortcut, l);
}
}
public void addIgnoredComponent(Component com) {
ignoredComponents.add(com);
}
public void removeDiscardComponent(Component com) {
ignoredComponents.remove(com);
}
public static interface ShortcutListener {
void handle();
}
}
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
import java.awt.BorderLayout;
import java.awt.event.KeyEvent;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
public class ShortcutTest {
/**
* 測試使用
*
* @param args
*/
public static void main(String[] args) {
JFrame frame = new JFrame();
JButton button = new JButton("Button");
JTextArea textArea = new JTextArea();
JScrollPane scroller = new JScrollPane(textArea);
frame.getContentPane().add(button, BorderLayout.NORTH);
frame.getContentPane().add(scroller, BorderLayout.CENTER);
// ////////////////////////////////////////////////////////////////////////////////////
// 注冊快捷鍵方法
ShortcutManager.getInstance().addShortcutListener(new ShortcutManager.ShortcutListener() {
public void handle() {
System.out.println("Meta + I");
}
}, KeyEvent.VK_META, KeyEvent.VK_I);
ShortcutManager.getInstance().addShortcutListener(new ShortcutManager.ShortcutListener() {
public void handle() {
System.out.println("Ctrl + Meta + M");
}
}, KeyEvent.VK_CONTROL, KeyEvent.VK_META, KeyEvent.VK_M);
// 測試忽略文本輸入里面的快捷鍵事件, 當按鈕得到焦點時, 快捷鍵事件能正常發(fā)生
ShortcutManager.getInstance().addIgnoredComponent(textArea);
// /////////////////////////////////////////////////////////////////////////////////////
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(500, 500);
frame.setVisible(true);
}
}