How can I listen for key presses (within Java Swing) across all components?

java swing keylistener
diolemo picture diolemo · Mar 17, 2011 · Viewed 25.1k times · Source

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?

Answer

Matt Crinklaw-Vogt picture Matt Crinklaw-Vogt · Mar 17, 2011

It is possible.

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

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

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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