项目：查看器的使用

 1 package book.ch7.list;
 2 
 3 public class User {
 4     private String id;
 5     private String name;
 6     public User(String id, String name) {
 7         this.id = id;
 8         this.name = name;
 9     }
10     public String getId() {
11         return id;
12     }
13     public void setId(String id) {
14         this.id = id;
15     }
16     public String getName() {
17         return name;
18     }
19     public void setName(String name) {
20         this.name = name;
21     }
22 }

 1 package book.ch7.list;
 2 
 3 import java.beans.PropertyChangeEvent;
 4 import java.beans.PropertyChangeListener;
 5 import java.beans.PropertyChangeSupport;
 6 import java.util.Vector;
 7 
 8 public class ListModel {
 9 
10     public static final String ADD_ELEMENT = "addElement";
11 
12     public static final String REMOVE_ELEMENT = "removeElement";
13 
14     private PropertyChangeSupport delegate;
15 
16     private Vector content;
17 
18     public ListModel() {
19         content = new Vector();
20         delegate = new PropertyChangeSupport(this);
21     }
22 
23     public void addPropertyChangeListener(PropertyChangeListener listener) {
24         delegate.addPropertyChangeListener(listener);
25     }
26 
27     public void firePropertyChange(PropertyChangeEvent evt) {
28         delegate.firePropertyChange(evt);
29     }
30 
31     public void removePropertyChangeListener(PropertyChangeListener listener) {
32         delegate.removePropertyChangeListener(listener);
33     }
34 
35     public void add(Object element) {
36         if (content.add(element))
37             firePropertyChange(new PropertyChangeEvent(this, ADD_ELEMENT, null,
38                     element));
39     }
40 
41     public void remove(Object element) {
42         if (content.remove(element))
43             firePropertyChange(new PropertyChangeEvent(this, REMOVE_ELEMENT,
44                     null, element));
45     }
46 
47     public Object[] elements() {
48         return content.toArray();
49     }
50 }

 1 package book.ch7.list;
 2 
 3 import java.beans.PropertyChangeEvent;
 4 import java.beans.PropertyChangeListener;
 5 
 6 import org.eclipse.jface.viewers.IStructuredContentProvider;
 7 import org.eclipse.jface.viewers.ListViewer;
 8 import org.eclipse.jface.viewers.Viewer;
 9 
10 public class ListContentProvider implements IStructuredContentProvider,
11         PropertyChangeListener {
12 
13     private ListViewer viewer;
14 
15     private ListModel model;
16 
17     public Object[] getElements(Object inputElement) {
18         return model.elements();
19     }
20 
21     public void dispose() {
22     }
23 
24     public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
25         this.viewer = (ListViewer) viewer;
26 
27         if (oldInput instanceof ListModel)
28             ((ListModel) oldInput).removePropertyChangeListener(this);
29 
30         if (newInput instanceof ListModel) {
31             this.model = (ListModel) newInput;
32             ((ListModel) newInput).addPropertyChangeListener(this);
33         }
34 
35     }
36 
37     public void propertyChange(PropertyChangeEvent evt) {
38         if (ListModel.ADD_ELEMENT.equals(evt.getPropertyName()))
39             viewer.add(evt.getNewValue());
40         if (ListModel.REMOVE_ELEMENT.equals(evt.getPropertyName()))
41             viewer.remove(evt.getNewValue());
42     }
43 }

 1 package book.ch7.list;
 2 
 3 import org.eclipse.jface.viewers.ILabelProvider;
 4 import org.eclipse.jface.viewers.ILabelProviderListener;
 5 import org.eclipse.swt.graphics.Image;
 6 
 7 public class ListLabelProvider implements ILabelProvider {
 8 
 9     public Image getImage(Object element) {
10         return null;
11     }
12 
13     public String getText(Object element) {
14         if(element instanceof User)
15             return ((User)element).getName();
16         return element.toString();
17     }
18 
19     public boolean isLabelProperty(Object element, String property) {
20         return false;
21     }
22     
23     public void dispose() {}
24     
25     public void addListener(ILabelProviderListener listener) {}
26     
27     public void removeListener(ILabelProviderListener listener) {}
28 }

 1 package book.ch7.list;
 2 
 3 import org.eclipse.jface.viewers.ListViewer;
 4 import org.eclipse.swt.SWT;
 5 import org.eclipse.swt.layout.FillLayout;
 6 import org.eclipse.swt.widgets.Display;
 7 import org.eclipse.swt.widgets.Shell;
 8 
 9 public class UsingListViewer {
10 
11     public static void main(String[] args) {
12         Display display = Display.getDefault();
13         Shell shell = new Shell(display);
14         shell.setSize(400, 400);
15         shell.setLayout(new FillLayout());
16 
17         ListViewer viewer = new ListViewer(shell, SWT.BORDER);
18 
19         viewer.setContentProvider(new ListContentProvider());
20         viewer.setLabelProvider(new ListLabelProvider());
21 
22         ListModel input = new ListModel();
23         viewer.setInput(input);
24         
25         shell.open();
26         shell.layout();
27         
28         input.add(new User("1","张三"));
29         input.add(new User("2","李四"));
30         input.add(new User("3","王五"));
31 
32 
33         while (!shell.isDisposed())
34             if (!display.readAndDispatch())
35                 display.sleep();
36     }
37 
38 }