Can we implement KeyBindings using KeyListener?

Question

Just the matter of interest, is there a way that KeyListener can do the same work as KeyBindings, I mean Overriding keyListener's method(s) and listen to multiple keys (CTRL+somekey).

I know, it's kinda stupid idea, but as I said, just a matter of interest.

Answer 1

You can do it by using a flag:

KeyListener kl = new KeyListener() {

    boolean controlPressed = false;
    @Override
    public void keyTyped(KeyEvent e) {
    }

    @Override
    public void keyPressed(KeyEvent e) {
        if(e.getKeyCode() == KeyEvent.VK_CONTROL) {
            controlPressed = true;
            return;
        }

        if(controlPressed) {
            // CTRL is pressed, you can check here for other keys:
            if(e.getKeyCode() == KeyEvent.VK_A) {
                //CTRL + A was pressed
            }
        }
    }

    @Override
    public void keyReleased(KeyEvent e) {
        if(e.getKeyCode() == KeyEvent.VK_CONTROL) {
            controlPressed = false;
        }
    }
};

---

As camickr pointed out in comments, the other way would be to use the isControlDown method from KeyEvent:

if(e.isControlDown()) {
    //CTRL is pressed
}