JAVAFX UI CONTROLS AND MULTIMEDIA - Introduction to Java Programming: Comprehensive Version - page 638

We now give a program that adds three radio buttons named Red, Green, and Blue to the
preceding example to let the user choose the color of the message, as shown in Figure 16.10.

VBox
containing
three radio
buttons

F IGURE 16.10

The program demonstrates using radio buttons.

Again there are at least two approaches to writing this program. The first is to revise the
preceding CheckBoxDemo class to insert the code for adding the radio buttons and process-
ing their events. The second is to define a subclass that extends CheckBoxDemo . Listing 16.4
gives the code to implement the second approach.

Application

L ISTING 16.4

RadioButtonDemo.java
1 import javafx.geometry.Insets;
2 import javafx.scene.control.RadioButton;
3 import javafx.scene.control.ToggleGroup;
4 import javafx.scene.layout.BorderPane;
5 import javafx.scene.layout.VBox;
6 import javafx.scene.paint.Color;
7
8 public class RadioButtonDemo extends CheckBoxDemo {
9 @Override // Override the getPane() method in the super class
10 protected BorderPane getPane() {
11 BorderPane pane = super .getPane();
12
13 VBox paneForRadioButtons = new VBox( 20 );
14 paneForRadioButtons.setPadding( new Insets( 5 , 5 , 5 , 5 ));
15 paneForRadioButtons.setStyle( "-fx-border-color: green" );
16 paneForRadioButtons.setStyle
17 ( "-fx-border-width: 2px; -fx-border-color: green" );
18 RadioButton rbRed = new RadioButton( "Red" );
19 RadioButton rbGreen = new RadioButton( "Green" );
20 RadioButton rbBlue = new RadioButton( "Blue" );
21 paneForRadioButtons.getChildren().addAll(rbRed, rbGreen, rbBlue);
22

ButtonDemo

CheckBoxDemo

RadioButtonDemo

override getPane()
invoke super.getPane()

pane for radio buttons

create radio buttons

pane.setLeft(paneForRadioButtons);

add to border pane

23
24 ToggleGroup group = new ToggleGroup();

group radio buttons

25 rbRed.setToggleGroup(group);

26 rbGreen.setToggleGroup(group);

27 rbBlue.setToggleGroup(group);

28
29 rbRed.setOnAction(e -> {
30 if (rbRed.isSelected()) {
31 text.setFill(Color.RED);
32 }
33 });
34
35 rbGreen.setOnAction(e -> {
36 if (rbGreen.isSelected()) {
37 text.setFill(Color.GREEN);

handle radio button