Prentice.Hall.Introduction.to.Java.Programming,.Brief.Version.9th.(2014).[sharethefiles.com]

646 Chapter 17 GUI Components
wrap line
wrap word
read only
scroll pane
17 // Set the font in the label and the text field
18 jlblImageTitle.setFont(new Font("SansSerif", Font.BOLD, 16));
19 jtaDescription.setFont(new Font("Serif", Font.PLAIN, 14));
20
21 // Set lineWrap and wrapStyleWord true for the text area
22
23
24
25
jtaDescription.setLineWrap(true);
jtaDescription.setWrapStyleWord(true);
jtaDescription.setEditable(false);
26 // Create a scroll pane to hold the text area
27 JScrollPane scrollPane = new JScrollPane(jtaDescription);
28
29 // Set BorderLayout for the panel, add label and scroll pane
30 setLayout(new BorderLayout(5, 5));
31 add(scrollPane, BorderLayout.CENTER);
32 add(jlblImageTitle, BorderLayout.WEST);
33 }
34
35 /** Set the title */
36 public void setTitle(String title) {
37 jlblImageTitle.setText(title);
38 }
39
40 /** Set the image icon */
41 public void setImageIcon(ImageIcon icon) {
42 jlblImageTitle.setIcon(icon);
43 }
44
45 /** Set the text description */
46 public void setDescription(String text) {
47 jtaDescription.setText(text);
48 }
49 }
The text area is inside a JScrollPane (line 27), which provides scrolling functions for
the text area. Scroll bars automatically appear if there is more text than the physical size of the
text area.
The lineWrap property is set to true (line 22) so that the line is automatically wrapped
when the text cannot fit in one line. The wrapStyleWord property is set to true (line 23) so
that the line is wrapped on words rather than characters. The text area is set as noneditable
(line 24), so you cannot edit the description in the text area.
It is not necessary to create a separate class for DescriptionPanel in this example.
However, this class was created for reuse in the next section, where you will use it to display
a description panel for various images.
create descriptionPanel
create frame
LISTING 17.3
TextAreaDemo.java
1 import java.awt.*;
2 import javax.swing.*;
3
4 public class TextAreaDemo extends JFrame {
5 // Declare and create a description panel
6 private DescriptionPanel descriptionPanel = new DescriptionPanel();
7
8 public static void main(String[] args) {
9 TextAreaDemo frame = new TextAreaDemo();
10 frame.pack();
11 frame.setLocationRelativeTo(null); // Center the frame