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应用程序范围的键盘快捷键 - Java Swing

[英]Application wide keyboard shortcut - Java Swing

I would like to create an application wide keyboard shortcut for a Java Swing application.我想为 Java Swing 应用程序创建一个应用程序范围的键盘快捷键。 Looping over all components and adding the shortcut on each, has focus related side effects, and seems like a brute force solution.遍历所有组件并在每个组件上添加快捷方式,具有与焦点相关的副作用,并且看起来像是蛮力解决方案。

Anyone has a cleaner solution?有人有更清洁的解决方案吗?

For each window, use JComponent.registerKeyboardAction with a condition of WHEN_IN_FOCUSED_WINDOW .对于每个 window,使用条件为WHEN_IN_FOCUSED_WINDOWJComponent.registerKeyboardAction Alternatively use:或者使用:

JComponent.getInputMap(WHEN_IN_FOCUSED_WINDOW).put(keyStroke, command);
JComponent.getActionMap().put(command,action);

as described in the registerKeyboardAction API docs .registerKeyboardAction API 文档中所述。

Install a custom KeyEventDispatcher.安装自定义 KeyEventDispatcher。 The KeyboardFocusManager class is also a good place for this functionality. KeyboardFocusManager class 也是此功能的好地方。

KeyEventDispatcher KeyEventDispatcher

For people wondering (like me) how to use KeyEventDispatcher, here is an example that I put together.对于想知道(像我一样)如何使用 KeyEventDispatcher 的人,这里是我整理的一个示例。 It uses a HashMap for storing all global actions, because I don't like large if (key ==..) then.. else if (key ==..) then.. else if (key ==..).. constructs.它使用 HashMap 来存储所有全局操作,因为我不喜欢大的if (key ==..) then.. else if (key ==..) then.. else if (key ==..)..构造。

/** map containing all global actions */
private HashMap<KeyStroke, Action> actionMap = new HashMap<KeyStroke, Action>();

/** call this somewhere in your GUI construction */
private void setup() {
  KeyStroke key1 = KeyStroke.getKeyStroke(KeyEvent.VK_A, KeyEvent.CTRL_DOWN_MASK);
  actionMap.put(key1, new AbstractAction("action1") {
    @Override
    public void actionPerformed(ActionEvent e) {
      System.out.println("Ctrl-A pressed: " + e);
    }
  });
  // add more actions..

  KeyboardFocusManager kfm = KeyboardFocusManager.getCurrentKeyboardFocusManager();
  kfm.addKeyEventDispatcher( new KeyEventDispatcher() {

    @Override
    public boolean dispatchKeyEvent(KeyEvent e) {
      KeyStroke keyStroke = KeyStroke.getKeyStrokeForEvent(e);
      if ( actionMap.containsKey(keyStroke) ) {
        final Action a = actionMap.get(keyStroke);
        final ActionEvent ae = new ActionEvent(e.getSource(), e.getID(), null );
        SwingUtilities.invokeLater( new Runnable() {
          @Override
          public void run() {
            a.actionPerformed(ae);
          }
        } ); 
        return true;
      }
      return false;
    }
  });
}

The use of SwingUtils.invokeLater() is maybe not necessary, but it is probably a good idea not to block the global event loop.使用 SwingUtils.invokeLater() 可能不是必需的,但最好不要阻塞全局事件循环。

When you have a menu, you can add global keyboard shortcuts to menu items:当你有一个菜单时,你可以将全局键盘快捷键添加到菜单项:

    JMenuItem item = new JMenuItem(action);
    KeyStroke key = KeyStroke.getKeyStroke(
        KeyEvent.VK_R, KeyEvent.CTRL_DOWN_MASK);
    item.setAccelerator(key);
    menu.add(item);

A little simplified example:一个简单的例子:

KeyboardFocusManager keyManager;

keyManager=KeyboardFocusManager.getCurrentKeyboardFocusManager();
keyManager.addKeyEventDispatcher(new KeyEventDispatcher() {

  @Override
  public boolean dispatchKeyEvent(KeyEvent e) {
    if(e.getID()==KeyEvent.KEY_PRESSED && e.getKeyCode()==27){
      System.out.println("Esc");
      return true;
    }
    return false;
  }

});

Use the following piece of code使用下面的一段代码

ActionListener a=new ActionListener(){
   public void actionPerformed(ActionEvent ae)
   {
    // your code
   }
};
getRootPane().registerKeyboardAction(a,KeyStroke.getKeyStroke("ctrl D"),JComponent.WHEN_IN_FOCUSED_WINDOW);

Replace "ctrl D" with the shortcut you want.将“ctrl D”替换为您想要的快捷方式。

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