Behavioral Patterns - Applied Java Patterns - page 51

2. import java.awt.event.ActionListener;
3. import javax.swing.JComboBox;
4. import javax.swing.JPanel;
5.
6. public class ContactSelectorPanel extends JPanel implements ActionListener{
7. private ContactMediator mediator;
8. private JComboBox selector;
9.
10. public ContactSelectorPanel(){
11. createGui();
12. }
13. public ContactSelectorPanel(ContactMediator newMediator){
14. setContactMediator(newMediator);
15. createGui();
16. }
17.
18. public void createGui(){
19. selector = new JComboBox(mediator.getAllContacts());
20. selector.addActionListener(this);
21. add(selector);
22. }
23.
24. public void actionPerformed(ActionEvent evt){
25. mediator.selectContact((Contact)selector.getSelectedItem());
26. }
27. public void addContact(Contact contact){
28. selector.addItem(contact);
29. selector.setSelectedItem(contact);
30. }
31. public void setContactMediator(ContactMediator newMediator){
32. mediator = newMediator;
33. }
34. }
The ContactEditorPanel provides an editing interface for the currently selected Contact . It has buttons that
allow a user to add or update a Contact .
Example 2.28 ContactEditorPanel.java
1. import java.awt.BorderLayout;
2. import java.awt.GridLayout;
3. import java.awt.event.ActionEvent;
4. import java.awt.event.ActionListener;
5. import javax.swing.JButton;
6. import javax.swing.JLabel;
7. import javax.swing.JPanel;
8. import javax.swing.JTextField;
9. public class ContactEditorPanel extends JPanel implements ActionListener{
10. private ContactMediator mediator;
11. private JTextField firstName, lastName, title, organization;
12. private JButton create, update;
13.
14. public ContactEditorPanel(){
15. createGui();
16. }
17. public ContactEditorPanel(ContactMediator newMediator){
18. setContactMediator(newMediator);
19. createGui();
20. }
21. public void createGui(){
22. setLayout(new BorderLayout());
23.
24. JPanel editor = new JPanel();
25. editor.setLayout(new GridLayout(4, 2));
26. editor.add(new JLabel("First Name:"));
27. firstName = new JTextField(20);
28. editor.add(firstName);
29. editor.add(new JLabel("Last Name:"));
30. lastName = new JTextField(20);
31. editor.add(lastName);
32. editor.add(new JLabel("Title:"));
33. title = new JTextField(20);
34. editor.add(title);
35. editor.add(new JLabel("Organization:"));
36. organization = new JTextField(20);
37. editor.add(organization);
38. add(editor, BorderLayout.CENTER);