01 package gate.gui;
02
03 import java.awt.BorderLayout;
04 import java.beans.PropertyChangeEvent;
05 import java.beans.PropertyChangeListener;
06 import java.io.IOException;
07 import java.net.URL;
08
09 import javax.swing.*;
10 import javax.swing.text.Document;
11
12 import gate.event.StatusListener;
13 import gate.swing.XJEditorPane;
14
15 /**
16 * A frame used by Gate to display Help information.
17 * It is a basic HTML browser.
18 */
19 public class HelpFrame extends JFrame implements StatusListener {
20
21 public HelpFrame(){
22 super();
23 initLocalData();
24 initGuiComponents();
25 initListeners();
26 }
27
28 protected void initLocalData(){
29 }
30
31 protected void initGuiComponents(){
32 getContentPane().setLayout(new BorderLayout());
33 textPane = new XJEditorPane();
34 textPane.setEditable(false);
35 getContentPane().add(new JScrollPane(textPane), BorderLayout.CENTER);
36
37 toolBar = new JToolBar();
38 toolBar.add(textPane.getBackAction());
39 toolBar.add(textPane.getForwardAction());
40
41 getContentPane().add(toolBar, BorderLayout.NORTH);
42
43 Box southBox = Box.createHorizontalBox();
44 southBox.add(new JLabel(" "));
45 status = new JLabel();
46 southBox.add(status);
47 getContentPane().add(southBox, BorderLayout.SOUTH);
48
49 }
50
51 protected void initListeners(){
52 textPane.addPropertyChangeListener(new PropertyChangeListener(){
53 public void propertyChange(PropertyChangeEvent e) {
54 if(e.getPropertyName().equals("document")){
55 String title = (String)textPane.getDocument().
56 getProperty("title");
57 setTitle((title == null) ?
58 "GATE help browser" :
59 title + " - GATE help browser");
60 }
61 }
62 });
63
64 textPane.addStatusListener(this);
65 }
66
67 public void setPage(URL newPage) throws IOException{
68 textPane.setPage(newPage);
69 String title = (String)textPane.getDocument().
70 getProperty(Document.TitleProperty);
71 setTitle((title == null) ?
72 "GATE help browser" :
73 title + " - GATE help browser");
74 }
75
76 XJEditorPane textPane;
77 JToolBar toolBar;
78 JLabel status;
79 public void statusChanged(String e) {
80 status.setText(e);
81 }
82 }
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