JAVAFX UI CONTROLS AND MULTIMEDIA - Introduction to Java Programming: Comprehensive Version - page 636

15
16 Font fontBoldItalic = Font.font( "Times New Roman" ,
17 FontWeight.BOLD, FontPosture.ITALIC, 20 );
18 Font fontBold = Font.font( "Times New Roman" ,
19 FontWeight.BOLD, FontPosture.REGULAR, 20 );
20 Font fontItalic = Font.font( "Times New Roman" ,
21 FontWeight.NORMAL, FontPosture.ITALIC, 20 );
22 Font fontNormal = Font.font( "Times New Roman" ,
23 FontWeight.NORMAL, FontPosture.REGULAR, 20 );
24
25 text.setFont(fontNormal);
26
27 VBox paneForCheckBoxes = new VBox( 20 );
28 paneForCheckBoxes.setPadding( new Insets( 5 , 5 , 5 , 5 ));
29 paneForCheckBoxes.setStyle( "-fx-border-color: green" );
30 CheckBox chkBold = new CheckBox( "Bold" );
31 CheckBox chkItalic = new CheckBox( "Italic" );
32 paneForCheckBoxes.getChildren().addAll(chkBold, chkItalic);
33 pane.setRight(paneForCheckBoxes);
34
35 EventHandler<ActionEvent> handler = e -> {
36 if (chkBold.isSelected() && chkItalic.isSelected()) {
37 text.setFont(fontBoldItalic); // Both check boxes checked
38 }
39 else if (chkBold.isSelected()) {
40 text.setFont(fontBold); // The Bold check box checked
41 }
42 else if (chkItalic.isSelected()) {
43 text.setFont(fontItalic); // The Italic check box checked
44 }
45 else {
46 text.setFont(fontNormal); // Both check boxes unchecked
47 }
48 };
49
50

create fonts

pane for check boxes

create check boxes

create a handler

chkBold.setOnAction(handler); set handler for action

51 chkItalic.setOnAction(handler);

52
53 return pane; // Return a new pane

return a pane

54 }
55 } main method omitted

CheckBoxDemo extends ButtonDemo and overrides the getPane() method (line 13).
The new getPane() method invokes the super.getPane() method from the ButtonDemo
class to obtain a border pane that contains the buttons and a text (line 14). The check boxes are
created and added to paneForCheckBoxes (lines 30-32). paneForCheckBoxes is added to
the border pane (lines 33).
The handler for processing the action event on check boxes is created in lines 35-48. It sets
the appropriate font based on the status of the check boxes.
The start method for this JavaFX program is defined in ButtonDemo and inherited
in CheckBoxDemo . So when you run CheckBoxDemo , the start method in ButtonDemo
is invoked. Since the getPane() method is overridden in CheckBoxDemo , the method in
CheckBoxDemo is invoked from line 41 in Listing 16.2, ButtonDemo.java.

16.8

✓ ✓

How do you test if a check box is selected?

Check

16.9

Point

Can you apply all the methods for Labeled to CheckBox ?

16.10

Can you set a node for the graphic property in a check box?