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import javafx.application.Application;
import javafx.beans.value.ChangeListener;
import javafx.beans.value.ObservableValue;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.control.Toggle;
import javafx.scene.control.ToggleButton;
import javafx.scene.control.ToggleGroup;
import javafx.stage.Stage;

/**
 *
 * @author slions
 */
public class ToggleButtonTest2 extends Application {

    private Scene scene = null;

    public static void main(String[] args) {
        Application.launch(ToggleButtonTest2.class, null);
    }

    public void start(Stage stage) {

        scene = new Scene(new Group());

        stage.setTitle("TEST");
        stage.setWidth(500);
        stage.setHeight(500);
        stage.setScene(scene);
        stage.setVisible(true);

        final ToggleButton run = new ToggleButton("run");
        run.setLayoutX(20);
        run.setLayoutY(20);
        final ToggleButton stop = new ToggleButton("stop");
        stop.setLayoutX(100);
        stop.setLayoutY(20);
        final ToggleGroup toggleGroup = new ToggleGroup();

        run.setToggleGroup(toggleGroup);
        stop.setToggleGroup(toggleGroup);

        run.setSelected(true);

        ((Group) scene.getRoot()).getChildren().addAll(run, stop);


        toggleGroup.selectedToggleProperty().addListener(new ChangeListener<Toggle>() {

            public void changed(ObservableValue<? extends Toggle> observable, Toggle oldValue, Toggle newValue) {
                if (newValue == null) {
                    toggleGroup.selectToggle(oldValue);
                }
            }
        });
        
        // When uncommenting the code above, we get the expected behavior but this is like a duplication
        // Why do we need to add the following listeners
//        run.selectedProperty().addListener(new ChangeListener<Boolean>() {
//
//                public void changed(ObservableValue<? extends Boolean> observable, Boolean oldValue, Boolean newValue) {
//                if (newValue == false && toggleGroup.getSelectedToggle() == null) {
//                    toggleGroup.selectToggle(run);
//                    run.setSelected(true);
//                }
//            }
//        });
//
//        stop.selectedProperty().addListener(new ChangeListener<Boolean>() {
//
//                public void changed(ObservableValue<? extends Boolean> observable, Boolean oldValue, Boolean newValue) {
//                if (newValue == false && toggleGroup.getSelectedToggle() == null) {
//                    stop.setSelected(true);
//                }
//            }
//        });
    }
}