JAVAFX UI CONTROLS AND MULTIMEDIA - Introduction to Java Programming: Comprehensive Version - page 655

L ISTING 16.11

SliderDemo.java
1 import javafx.application.Application;
2 import javafx.stage.Stage;
3 import javafx.geometry.Orientation;
4 import javafx.scene.Scene;
5 import javafx.scene.control.Slider;
6 import javafx.scene.layout.BorderPane;
7 import javafx.scene.layout.Pane;
8 import javafx.scene.text.Text;
9
10 public class SliderDemo extends Application {
11 @Override // Override the start method in the Application class
12 public void start(Stage primaryStage) {
13 Text text = new Text( 20 , 20 , "JavaFX Programming" );
14
15 Slider slHorizontal = new Slider();
16 slHorizontal.setShowTickLabels( true );
17 slHorizontal.setShowTickMarks( true );
18
19 Slider slVertical = new Slider();
20 slVertical.setOrientation(Orientation.VERTICAL);
21 slVertical.setShowTickLabels( true );
22 slVertical.setShowTickMarks( true );
23 slVertical.setValue( 100 );
24
25 // Create a text in a pane
26 Pane paneForText = new Pane();
27 paneForText.getChildren().add(text);
28
29 // Create a border pane to hold text and scroll bars
30 BorderPane pane = new BorderPane();
31 pane.setCenter(paneForText);
32 pane.setBottom(slHorizontal);
33 pane.setRight(slVertical);
34
35 slHorizontal.valueProperty().addListener(ov ->
36 text.setX(slHorizontal.getValue() * paneForText.getWidth() /
37 slHorizontal.getMax()));
38
39 slVertical.valueProperty().addListener(ov ->
40 text.setY((slVertical.getMax() - slVertical.getValue())
41 * paneForText.getHeight() / slVertical.getMax()));
42
43 // Create a scene and place it in the stage
44 Scene scene = new Scene(pane, 450 , 170 );
45 primaryStage.setTitle( "SliderDemo" ); // Set the stage title
46 primaryStage.setScene(scene); // Place the scene in the stage
47 primaryStage.show(); // Display the stage
48 }
49 }

horizontal slider
set slider properties

vertical slider
set slider properties

add text to a pane

border pane

set new location for text

set new location for text

Slider is similar to ScrollBar but has more features. As shown in this example, you can
specify labels, major ticks, and minor ticks on a Slider (lines 16-17).
A listener is registered to listen for the slHorizontal value property change (lines
35-37) and another one is for the sbVertical value property change (lines 39-41). When
the value of the slider changes, the listener is notified by invoking the handler to set a new posi-
tion for the text (lines 36-37, 40-41). Note that since the value of a vertical slider decreases
from top to bottom, the corresponding y value for the text is adjusted accordingly.