bind two ToggleButtons to a BooleanProperty

I have two ToggleButtons and I would like them both to be bound to a Boolean property so that when one ToggleButton is selected, the other ToggleButton isn't, and the BooleanProperty is true, and vice versa.

Here's what I tried.

FXML file:

<VBox xmlns:fx="" fx:controller="my.package.MainController" styleClass="Tool" fx:id="root">
<HBox spacing="10">
        <ToggleGroup fx:id="modeToggleGroup"/>
    <ToggleButton fx:id="manualModeBtn" text="Manual Mode" selected="true" toggleGroup="$modeToggleGroup"/>
    <ToggleButton fx:id="automaticModeBtn" text="Automatic Mode" toggleGroup="$modeToggleGroup"/>
<!-- other stuff -->

Controller file:

public class MainController {

    private ToggleButton manualModeBtn;
    private ToggleButton automaticModeBtn;

    private BooleanProperty isAutomaticMode;

    public void initialize() {
        isAutomaticMode = new SimpleBooleanProperty();

The ToggleGroup ensures that neither button is selected at the same time, but I can still unselect both of them, which I don't want to be possible.

How do I bind the other ToggleButton to the opposite (i.e. not()) of the Boolean Property?

2 answers

  • answered 2018-01-11 20:35 James_D

    You could do this by using listeners:

    public class MainController {
        private ToggleButton manualModeBtn;
        private ToggleButton automaticModeBtn;
        public void initialize() {
            manualModeBtn.selectedProperty().addListener((obs, wasSelected, isNowSelected) -> automaticModeBtn.setSelected(! isNowSelected));
            automaticModeBtn.selectedProperty().addListener((obs, wasSelected, isNowSelected) -> manualModeBtn.setSelected(! isNowSelected));

    Note that RadioButton has almost this functionality already (in the case of a radio button, you can't "deselect" it), so you could simply use RadioButtons instead. Note this question, if it is just a case of how they look.

  • answered 2018-01-11 20:55 Sedrick

    This can also be done by setting a listener on the ToggleGroup's selectedToggleProperty.

    You first have to set an initial button.

    import javafx.application.Application;
    import javafx.scene.Scene;
    import javafx.scene.control.ToggleButton;
    import javafx.scene.control.ToggleGroup;
    import javafx.scene.layout.HBox;
    import javafx.stage.Stage;
    public class ToggleButtonExperiments extends Application
        public void start(Stage primaryStage) throws Exception
            primaryStage.setTitle("HBox Experiment 1");
            ToggleButton toggleButton1 = new ToggleButton("Left");
            ToggleButton toggleButton2 = new ToggleButton("Right");
            ToggleGroup toggleGroup = new ToggleGroup();
            toggleButton1.setSelected(true);//set initial button!!!!!
            toggleGroup.selectedToggleProperty().addListener((obs, oldTog, newTog) -> {
                if (newTog == null) {
            HBox hbox = new HBox(toggleButton1, toggleButton2);
            Scene scene = new Scene(hbox, 200, 100);
        public static void main(String[] args)