about javafx tableview

Question

I want to customize the button of the tableview, but it is empty when I get the show-hide-columns-button in the initialize method. There is a way to get the show-hide-columns-button.

    @FXML
    private TableView tableView;

    @Override
    public void initialize(URL location, ResourceBundle resources) {
        tableView.setTableMenuButtonVisible(true);
        final Node showHideColumnsButton = tableView
                .lookup(".show-hide-columns-button");
        System.out.println(showHideColumnsButton);
    }

Answer 1

As mentioned in the comments, a call to lookup(".show-hide-columns-button") returns null if the Scene is not shown yet. A simple solution:

tableView.sceneProperty().addListener((observable, oldScene, newScene) -> {
    if (newScene != null) {
        newScene.windowProperty().addListener((obs, oldWindow, newWindow) -> {
            if (newWindow != null) {
                newWindow.addEventHandler(WindowEvent.WINDOW_SHOWN, event -> {
                    final Node showHideColumnsButton = tableView.lookup(".show-hide-columns-button");
                    // Customize your node here...
                    showHideColumnsButton.setStyle("-fx-background-color: red;");
                    event.consume();
                });
            }
        });
    }
});