如何在所有组件中监听按键（在Java Swing中）？ [英] How can I listen for key presses (within Java Swing) across all components?

问题描述

我想要监听键组合，例如 Control + S ，而不是在Swing应用程序中为每个组件添加键侦听器。我怎样才能做到这一点？

I would like to listen for key combinations such as Control+S without adding key listeners to each component in my Swing application. How can I achieve this?

推荐答案

这是可能的。

KeyboardFocusManager.getCurrentKeyboardFocusManager()
  .addKeyEventDispatcher(new KeyEventDispatcher() {
      @Override
      public boolean dispatchKeyEvent(KeyEvent e) {
        System.out.println("Got key event!");
        return false;
      }
});

这将获取所有关键事件。返回false允许键盘焦点管理器恢复正常的键事件调度到各种组件。

That will grab all key events. Returning false allows the keyboard focus manager to resume normal key event dispatching to the various components.

如果你想捕捉关键组合，你可以保留一组按下的键。每当按下一个键时，将其添加到该组中并检查该组中已有的键。释放钥匙后，将其从套装中移除。

If you want to catch key combos, you can keep a set of "pressed keys." Whenever a key is pressed, add it to the set and check what keys are already in the set. When a key is released, remove it from the set.

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