GUIUtils.java 文件源码

public static void activateKeyStates() {
    if (keyStates == null)
        keyStates = new AdvancedKeyListenerFilter(null,  false);
    // add a global listener
    Toolkit.getDefaultToolkit().addAWTEventListener(new AWTEventListener() {
        public void eventDispatched(AWTEvent e) {
            if (e instanceof KeyEvent) {
                switch (e.getID()) {
                case KeyEvent.KEY_PRESSED:
                    keyStates.keyPressed((KeyEvent)e);
                    break;
                case KeyEvent.KEY_RELEASED:
                    keyStates.keyReleased((KeyEvent)e);
                    break;
                case KeyEvent.KEY_TYPED:
                    keyStates.keyTyped((KeyEvent)e);
                    break;
                }
            }
        }
    }, AWTEvent.KEY_EVENT_MASK);
}