JAVAFX UI CONTROLS AND MULTIMEDIA - Introduction to Java Programming: Comprehensive Version - page 633

javafx.scene.control.Labeled

The getter and setter methods for property
values and a getter for property itself are provided
in the class, but omitted in the UML diagram for brevity.

javafx.scene.control.ButtonBase

-onAction: ObjectProperty<EventHandler
<ActionEvent>>

Defines a handler for handling a button's action.

javafx.scene.control.Button

+Button()
+Button(text: String)
+Button(text: String, graphic: Node)

Creates an empty button.
Creates a button with the specified text.
Creates a button with the specified text and graphic.

F IGURE 16.5

ButtonBase extends Labeled and defines common features for all buttons.

Listing 16.2 gives a program that uses the buttons to control the movement of a text, as
shown in Figure 16.6.

L ISTING 16.2

ButtonDemo.java
1 import javafx.application.Application;
2 import javafx.stage.Stage;
3 import javafx.geometry.Pos;
4 import javafx.scene.Scene;
5 import javafx.scene.control.Button;
6 import javafx.scene.image.ImageView;
7 import javafx.scene.layout.BorderPane;
8 import javafx.scene.layout.HBox;
9 import javafx.scene.layout.Pane;
10 import javafx.scene.text.Text;
11
12 public class ButtonDemo extends Application {
13 protected Text text = new Text( 50 , 50 , "JavaFX Programming" );

14
15 protected BorderPane getPane() {
16 HBox paneForButtons = new HBox( 20 );
17 Button btLeft = new Button( "Left" ,
18 new ImageView( "image/left.gif" ));
19 Button btRight = new Button( "Right" ,
20 new ImageView( "image/right.gif" ));
21 paneForButtons.getChildren().addAll(btLeft, btRight);
22 paneForButtons.setAlignment(Pos.CENTER);
23 paneForButtons.setStyle( "-fx-border-color: green" );
24
25 BorderPane pane = new BorderPane();
26 pane.setBottom(paneForButtons);
27
28 Pane paneForText = new Pane();
29 paneForText.getChildren().add(text);
30 pane.setCenter(paneForText);
31
32

create a button

add buttons to pane

create a border pane
add buttons to the bottom

btLeft.setOnAction(e -> text.setX(text.getX() - 10 ));

add an action handler

33 btRight.setOnAction(e -> text.setX(text.getX() + 10 ));

34
35 return pane; return a pane