JavaFX TextArea中的Tab键导航

如果按TAB键，则此代码遍历焦点；如果按ConTROL + TAB键，则插入标签。

textarea.addEventFilter(KeyEvent.KEY_PRESSED, new EventHandler<KeyEvent>() {        @Override        public void handle(KeyEvent event) { if (event.getCode() == KeyCode.TAB) {     Skinbase skin = (Skinbase) textarea.getSkin();     if (skin.getBehavior() instanceof textareaBehavior) {         textareaBehavior behavior = (textareaBehavior) skin.getBehavior();         if (event.isControlDown()) {  behavior.callAction("InsertTab");         } else {  behavior.callAction("TraverseNext");         }         event.consume();     } }        }    });