1 /*
2 * File: Netscape.java
3 *
4 * This applet/application demonstrates the following classes:
5 * TextArea, Frame, MenuBar, Menu, MenuItem, CheckboxMenuItem,
6 * MenuShortcut, FileDialog, BufferedReader, and FileReader.
7 *
8 * Note that MenuItems generate ActionEvents, while CheckboxMenuItems
9 * generate ItemEvents.
10 *
11 * Copyright: Northeast Parallel Architectures Center
12 *
13 */
14
15 import java.applet.Applet;
16 import java.awt.*;
17 import java.awt.event.*;
18 import java.io.*;
19
20 public class Netscape extends Applet implements ActionListener {
21
22 private Button button;
23
24 public void init() {
25 button = new Button( "New Web Browser" );
26 add( button );
27 button.addActionListener( this );
28 }
29
30 public void actionPerformed( ActionEvent e ) {
31 new NewWebBrowser();
32 }
33
34 public static void main( String[] args ) {
35 new NewWebBrowser();
36 }
37
38 }
39
40 // Simulate a Netscape web browser window:
41 class NewWebBrowser extends Frame {
42
43 protected static int num_windows = 0; // number of open windows
44
45 String currentDir = "."; // current dir for the open file dialog
46
47 String ellipsis = "..."; // ellipsis for menu items
48 // char ellipsis = '\u2026'; // Why doesn't this work?
49
50 // GUI components:
51 MenuBar menubar;
52 TextArea textarea;
53
54 // Constructor:
55 public NewWebBrowser() {
56
57 // Invoke the constructor of the superclass:
58 super( "Web Browser" );
59
60 num_windows++; // update open window counter
61
62 // Set frame parameters:
63 setSize( 700, 800 );
64 setFont( new Font( "SansSerif", Font.BOLD, 12 ) );
65
66 textarea = new TextArea();
67 add( textarea, BorderLayout.CENTER );
68 textarea.setFont( new Font( "Monospaced", Font.BOLD, 10 ) );
69
70 menubar = new MenuBar();
71 menubar.add( new FileMenu() );
72 menubar.add( new EditMenu() );
73 menubar.add( new ViewMenu() );
74 menubar.add( new GoMenu() );
75 menubar.add( new BookmarksMenu() );
76 menubar.add( new OptionsMenu() );
77 menubar.add( new DirectoryMenu() );
78 menubar.add( new WindowMenu() );
79 menubar.setHelpMenu( new HelpMenu() ); // the Help menu is special
80
81 setMenuBar( menubar );
82 setVisible( true );
83 }
84
85 class FileMenu extends Menu implements ActionListener {
86
87 // Menu item names:
88 MenuItem newWebBrowserItem,
89 newMailMessageItem,
90 mailDocumentItem,
91 openLocationItem,
92 openFileItem,
93 saveAsItem,
94 uploadFileItem,
95 printItem,
96 closeItem,
97 exitItem;
98
99 // Menu constructor:
100 public FileMenu() {
101
102 // Invoke the constructor of the superclass:
103 super( "File" );
104
105 // Menu items with shortcuts:
106 newWebBrowserItem
107 = new MenuItem( "New Web Browser",
108 new MenuShortcut( KeyEvent.VK_N ) );
109 newMailMessageItem
110 = new MenuItem( "New Mail Message",
111 new MenuShortcut( KeyEvent.VK_M ) );
112 mailDocumentItem
113 = new MenuItem( "Mail Document" );
114
115 openLocationItem
116 = new MenuItem( "Open Location" + ellipsis,
117 new MenuShortcut( KeyEvent.VK_L ) );
118 openFileItem
119 = new MenuItem( "Open File" + ellipsis,
120 new MenuShortcut( KeyEvent.VK_O ) );
121 saveAsItem
122 = new MenuItem( "Save As" + ellipsis,
123 new MenuShortcut( KeyEvent.VK_S ) );
124 uploadFileItem
125 = new MenuItem( "Upload File" + ellipsis );
126
127 printItem
128 = new MenuItem( "Print" + ellipsis,
129 new MenuShortcut( KeyEvent.VK_P ) );
130 closeItem
131 = new MenuItem( "Close",
132 new MenuShortcut( KeyEvent.VK_W ) );
133 exitItem
134 = new MenuItem( "Exit",
135 new MenuShortcut( KeyEvent.VK_Q ) );
136
137 // Build the menu:
138 add( newWebBrowserItem );
139 add( newMailMessageItem );
140 add( mailDocumentItem );
141 addSeparator();
142 add( openLocationItem );
143 add( openFileItem );
144 add( saveAsItem );
145 add( uploadFileItem );
146 addSeparator();
147 add( printItem );
148 addSeparator();
149 add( closeItem );
150 add( exitItem );
151
152 // Disable menu item(s):
153 uploadFileItem.setEnabled( false );
154
155 // Listen for ActionEvents generated by menu items:
156 newWebBrowserItem.addActionListener( this );
157 openFileItem.addActionListener( this );
158 exitItem.addActionListener( this );
159 }
160
161 // ActionEvent handler:
162 public void actionPerformed( ActionEvent e ) {
163
164 // File:New
165 if ( e.getSource() == newWebBrowserItem ) {
166 new NewWebBrowser();
167
168 // File:Open
169 } else if ( e.getSource() == openFileItem ) {
170 FileDialog d =
171 new FileDialog( NewWebBrowser.this, "Open File", FileDialog.LOAD );
172 d.setFont( new Font( "Monospaced", Font.PLAIN, 12 ) );
173 d.setDirectory( currentDir );
174 d.setVisible( true );
175 String filename = d.getFile();
176 if ( filename != null ) {
177 currentDir = d.getDirectory();
178 try {
179 BufferedReader in =
180 new BufferedReader(
181 new FileReader( currentDir + filename ) );
182 StringBuffer buf = new StringBuffer();
183 String text;
184 while ( ( text = in.readLine() ) != null ) {
185 buf.append( text + "\n" );
186 }
187 in.close();
188 textarea.setText( buf.toString() );
189 } catch ( IOException e2 ) {
190 System.err.println( e2.toString() );
191 }
192 }
193
194 // File:Exit
195 } else if ( e.getSource() == exitItem ) {
196 setVisible( false );
197 dispose();
198 if ( --num_windows == 0 ) {
199 try {
200 System.exit(0);
201 } catch ( SecurityException e3 ) { }
202 }
203 }
204 }
205
206 }
207
208 class EditMenu extends Menu implements ActionListener {
209
210 // Menu item names:
211 MenuItem undoItem,
212 cutItem,
213 copyItem,
214 pasteItem,
215 findItem,
216 findAgainItem;
217
218 // Menu constructor:
219 public EditMenu() {
220
221 // Invoke the constructor of the superclass:
222 super( "Edit" );
223
224 // Menu items with shortcuts:
225 undoItem
226 = new MenuItem( "Undo",
227 new MenuShortcut( KeyEvent.VK_Z ) );
228 cutItem
229 = new MenuItem( "Cut",
230 new MenuShortcut( KeyEvent.VK_X ) );
231 copyItem
232 = new MenuItem( "Copy",
233 new MenuShortcut( KeyEvent.VK_C ) );
234 pasteItem
235 = new MenuItem( "Paste",
236 new MenuShortcut( KeyEvent.VK_V ) );
237 findItem
238 = new MenuItem( "Find" + ellipsis,
239 new MenuShortcut( KeyEvent.VK_F ) );
240 findAgainItem
241 = new MenuItem( "Find Again",
242 new MenuShortcut( KeyEvent.VK_G ) );
243
244 // Build the menu:
245 add( undoItem );
246 addSeparator();
247 add( cutItem );
248 add( copyItem );
249 add( pasteItem );
250 addSeparator();
251 add( findItem );
252 add( findAgainItem );
253
254 }
255
256 // ActionEvent handler:
257 public void actionPerformed( ActionEvent e ) {
258 }
259
260 }
261
262 class ViewMenu extends Menu implements ActionListener {
263
264 // Menu constructor:
265 public ViewMenu() {
266
267 // Invoke the constructor of the superclass:
268 super( "View" );
269
270 }
271
272 // ActionEvent handler:
273 public void actionPerformed( ActionEvent e ) {
274 }
275
276 }
277
278 class GoMenu extends Menu implements ActionListener {
279
280 // Menu constructor:
281 public GoMenu() {
282
283 // Invoke the constructor of the superclass:
284 super( "Go" );
285
286 }
287
288 // ActionEvent handler:
289 public void actionPerformed( ActionEvent e ) {
290 }
291
292 }
293
294 class BookmarksMenu extends Menu implements ActionListener {
295
296 // Menu constructor:
297 public BookmarksMenu() {
298
299 // Invoke the constructor of the superclass:
300 super( "Bookmarks" );
301
302 }
303
304 // ActionEvent handler:
305 public void actionPerformed( ActionEvent e ) {
306 }
307
308 }
309
310 class OptionsMenu extends Menu implements ActionListener {
311
312 // Menu item names:
313 MenuItem generalPrefs,
314 mailAndNewsPrefs,
315 networkPrefs,
316 securityPrefs;
317
318 // Checkable menu item names:
319 CheckboxMenuItem showMenubarItem,
320 showToolbarItem,
321 showLocationItem,
322 showDirectoryButtonsItem,
323 showJavaConsoleItem;
324
325 // Menu constructor:
326 public OptionsMenu() {
327
328 // Invoke the constructor of the superclass:
329 super( "Options" );
330
331 // Menu items:
332 generalPrefs = new MenuItem( "General Preferences" + ellipsis );
333 mailAndNewsPrefs = new MenuItem( "Mail and News Preferences" + ellipsis );
334 networkPrefs = new MenuItem( "Network Preferences" + ellipsis );
335 securityPrefs = new MenuItem( "Security Preferences" + ellipsis );
336
337 // Checkable menu items:
338 showMenubarItem = new CheckboxMenuItem( "Show Menubar" );
339 showMenubarItem.setState( true ); // checked by default
340 showToolbarItem = new CheckboxMenuItem( "Show Toolbar" );
341 showLocationItem = new CheckboxMenuItem( "Show Location" );
342 showDirectoryButtonsItem = new CheckboxMenuItem( "Show Directory Buttons" );
343 showJavaConsoleItem = new CheckboxMenuItem( "Show Java Console" );
344
345 // Build the menu:
346 add( generalPrefs );
347 add( mailAndNewsPrefs );
348 add( networkPrefs );
349 add( securityPrefs );
350 addSeparator();
351 add( showMenubarItem );
352 add( showToolbarItem );
353 add( showLocationItem );
354 add( showDirectoryButtonsItem );
355 add( showJavaConsoleItem );
356 addSeparator();
357 add( new DocEncodingSubmenu() );
358
359 }
360
361 // ActionEvent handler:
362 public void actionPerformed( ActionEvent e ) {
363 }
364
365 class DocEncodingSubmenu extends Menu implements ActionListener {
366
367 // Menu constructor:
368 public DocEncodingSubmenu() {
369
370 // Invoke the constructor of the superclass:
371 super( "Document Encoding" );
372
373 // Build the menu:
374 add( new CheckboxMenuItem( "Western (Latin-1)", true ) );
375 addSeparator();
376 add( new CheckboxMenuItem( "Central European (Latin-2)" ) );
377 addSeparator();
378 add( new CheckboxMenuItem( "Japanese (Auto-Detect)" ) );
379 add( new CheckboxMenuItem( "Japanese (Shift-JIS)" ) );
380 add( new CheckboxMenuItem( "Japanese (EUC-JP)" ) );
381 // (many more such items omitted)
382
383 }
384
385 // ActionEvent handler:
386 public void actionPerformed( ActionEvent e ) {
387 }
388
389 }
390
391 }
392
393 class DirectoryMenu extends Menu implements ActionListener {
394
395 // Menu constructor:
396 public DirectoryMenu() {
397
398 // Invoke the constructor of the superclass:
399 super( "Directory" );
400
401 }
402
403 // ActionEvent handler:
404 public void actionPerformed( ActionEvent e ) {
405 }
406
407 }
408
409 class WindowMenu extends Menu implements ActionListener {
410
411 // Menu constructor:
412 public WindowMenu() {
413
414 // Invoke the constructor of the superclass:
415 super( "Window" );
416
417 }
418
419 // ActionEvent handler:
420 public void actionPerformed( ActionEvent e ) {
421 }
422
423 }
424
425 class HelpMenu extends Menu implements ActionListener {
426
427 // Menu constructor:
428 public HelpMenu() {
429
430 // Invoke the constructor of the superclass:
431 super( "Help" );
432
433 // Build the menu:
434 add( new MenuItem( "About Netscape" ) );
435 add( new MenuItem( "About Plug-ins" ) );
436 add( new MenuItem( "Registration Information" ) );
437 add( new MenuItem( "Software" ) );
438 addSeparator();
439 add( new MenuItem( "Handbook" ) );
440
441 }
442
443 // ActionEvent handler:
444 public void actionPerformed( ActionEvent e ) {
445 }
446
447 }
448
449 }
450