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Fixing #142; cut over to the django.contrib.staticfiles app.
author Brian Neal <bgneal@gmail.com>
date Thu, 27 Jan 2011 02:56:10 +0000
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children 6c182ceb7147
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1 /**
2 * editor_plugin_src.js
3 *
4 * Copyright 2009, Moxiecode Systems AB
5 * Released under LGPL License.
6 *
7 * License: http://tinymce.moxiecode.com/license
8 * Contributing: http://tinymce.moxiecode.com/contributing
9 *
10 * Adds auto-save capability to the TinyMCE text editor to rescue content
11 * inadvertently lost. This plugin was originally developed by Speednet
12 * and that project can be found here: http://code.google.com/p/tinyautosave/
13 *
14 * TECHNOLOGY DISCUSSION:
15 *
16 * The plugin attempts to use the most advanced features available in the current browser to save
17 * as much content as possible. There are a total of four different methods used to autosave the
18 * content. In order of preference, they are:
19 *
20 * 1. localStorage - A new feature of HTML 5, localStorage can store megabytes of data per domain
21 * on the client computer. Data stored in the localStorage area has no expiration date, so we must
22 * manage expiring the data ourselves. localStorage is fully supported by IE8, and it is supposed
23 * to be working in Firefox 3 and Safari 3.2, but in reality is is flaky in those browsers. As
24 * HTML 5 gets wider support, the AutoSave plugin will use it automatically. In Windows Vista/7,
25 * localStorage is stored in the following folder:
26 * C:\Users\[username]\AppData\Local\Microsoft\Internet Explorer\DOMStore\[tempFolder]
27 *
28 * 2. sessionStorage - A new feature of HTML 5, sessionStorage works similarly to localStorage,
29 * except it is designed to expire after a certain amount of time. Because the specification
30 * around expiration date/time is very loosely-described, it is preferrable to use locaStorage and
31 * manage the expiration ourselves. sessionStorage has similar storage characteristics to
32 * localStorage, although it seems to have better support by Firefox 3 at the moment. (That will
33 * certainly change as Firefox continues getting better at HTML 5 adoption.)
34 *
35 * 3. UserData - A very under-exploited feature of Microsoft Internet Explorer, UserData is a
36 * way to store up to 128K of data per "document", or up to 1MB of data per domain, on the client
37 * computer. The feature is available for IE 5+, which makes it available for every version of IE
38 * supported by TinyMCE. The content is persistent across browser restarts and expires on the
39 * date/time specified, just like a cookie. However, the data is not cleared when the user clears
40 * cookies on the browser, which makes it well-suited for rescuing autosaved content. UserData,
41 * like other Microsoft IE browser technologies, is implemented as a behavior attached to a
42 * specific DOM object, so in this case we attach the behavior to the same DOM element that the
43 * TinyMCE editor instance is attached to.
44 */
45
46 (function(tinymce) {
47 // Setup constants to help the compressor to reduce script size
48 var PLUGIN_NAME = 'autosave',
49 RESTORE_DRAFT = 'restoredraft',
50 TRUE = true,
51 undefined,
52 unloadHandlerAdded,
53 Dispatcher = tinymce.util.Dispatcher;
54
55 /**
56 * This plugin adds auto-save capability to the TinyMCE text editor to rescue content
57 * inadvertently lost. By using localStorage.
58 *
59 * @class tinymce.plugins.AutoSave
60 */
61 tinymce.create('tinymce.plugins.AutoSave', {
62 /**
63 * Initializes the plugin, this will be executed after the plugin has been created.
64 * This call is done before the editor instance has finished it's initialization so use the onInit event
65 * of the editor instance to intercept that event.
66 *
67 * @method init
68 * @param {tinymce.Editor} ed Editor instance that the plugin is initialized in.
69 * @param {string} url Absolute URL to where the plugin is located.
70 */
71 init : function(ed, url) {
72 var self = this, settings = ed.settings;
73
74 self.editor = ed;
75
76 // Parses the specified time string into a milisecond number 10m, 10s etc.
77 function parseTime(time) {
78 var multipels = {
79 s : 1000,
80 m : 60000
81 };
82
83 time = /^(\d+)([ms]?)$/.exec('' + time);
84
85 return (time[2] ? multipels[time[2]] : 1) * parseInt(time);
86 };
87
88 // Default config
89 tinymce.each({
90 ask_before_unload : TRUE,
91 interval : '30s',
92 retention : '20m',
93 minlength : 50
94 }, function(value, key) {
95 key = PLUGIN_NAME + '_' + key;
96
97 if (settings[key] === undefined)
98 settings[key] = value;
99 });
100
101 // Parse times
102 settings.autosave_interval = parseTime(settings.autosave_interval);
103 settings.autosave_retention = parseTime(settings.autosave_retention);
104
105 // Register restore button
106 ed.addButton(RESTORE_DRAFT, {
107 title : PLUGIN_NAME + ".restore_content",
108 onclick : function() {
109 if (ed.getContent({draft: true}).replace(/\s|&nbsp;|<\/?p[^>]*>|<br[^>]*>/gi, "").length > 0) {
110 // Show confirm dialog if the editor isn't empty
111 ed.windowManager.confirm(
112 PLUGIN_NAME + ".warning_message",
113 function(ok) {
114 if (ok)
115 self.restoreDraft();
116 }
117 );
118 } else
119 self.restoreDraft();
120 }
121 });
122
123 // Enable/disable restoredraft button depending on if there is a draft stored or not
124 ed.onNodeChange.add(function() {
125 var controlManager = ed.controlManager;
126
127 if (controlManager.get(RESTORE_DRAFT))
128 controlManager.setDisabled(RESTORE_DRAFT, !self.hasDraft());
129 });
130
131 ed.onInit.add(function() {
132 // Check if the user added the restore button, then setup auto storage logic
133 if (ed.controlManager.get(RESTORE_DRAFT)) {
134 // Setup storage engine
135 self.setupStorage(ed);
136
137 // Auto save contents each interval time
138 setInterval(function() {
139 self.storeDraft();
140 ed.nodeChanged();
141 }, settings.autosave_interval);
142 }
143 });
144
145 /**
146 * This event gets fired when a draft is stored to local storage.
147 *
148 * @event onStoreDraft
149 * @param {tinymce.plugins.AutoSave} sender Plugin instance sending the event.
150 * @param {Object} draft Draft object containing the HTML contents of the editor.
151 */
152 self.onStoreDraft = new Dispatcher(self);
153
154 /**
155 * This event gets fired when a draft is restored from local storage.
156 *
157 * @event onStoreDraft
158 * @param {tinymce.plugins.AutoSave} sender Plugin instance sending the event.
159 * @param {Object} draft Draft object containing the HTML contents of the editor.
160 */
161 self.onRestoreDraft = new Dispatcher(self);
162
163 /**
164 * This event gets fired when a draft removed/expired.
165 *
166 * @event onRemoveDraft
167 * @param {tinymce.plugins.AutoSave} sender Plugin instance sending the event.
168 * @param {Object} draft Draft object containing the HTML contents of the editor.
169 */
170 self.onRemoveDraft = new Dispatcher(self);
171
172 // Add ask before unload dialog only add one unload handler
173 if (!unloadHandlerAdded) {
174 window.onbeforeunload = tinymce.plugins.AutoSave._beforeUnloadHandler;
175 unloadHandlerAdded = TRUE;
176 }
177 },
178
179 /**
180 * Returns information about the plugin as a name/value array.
181 * The current keys are longname, author, authorurl, infourl and version.
182 *
183 * @method getInfo
184 * @return {Object} Name/value array containing information about the plugin.
185 */
186 getInfo : function() {
187 return {
188 longname : 'Auto save',
189 author : 'Moxiecode Systems AB',
190 authorurl : 'http://tinymce.moxiecode.com',
191 infourl : 'http://wiki.moxiecode.com/index.php/TinyMCE:Plugins/autosave',
192 version : tinymce.majorVersion + "." + tinymce.minorVersion
193 };
194 },
195
196 /**
197 * Returns an expiration date UTC string.
198 *
199 * @method getExpDate
200 * @return {String} Expiration date UTC string.
201 */
202 getExpDate : function() {
203 return new Date(
204 new Date().getTime() + this.editor.settings.autosave_retention
205 ).toUTCString();
206 },
207
208 /**
209 * This method will setup the storage engine. If the browser has support for it.
210 *
211 * @method setupStorage
212 */
213 setupStorage : function(ed) {
214 var self = this, testKey = PLUGIN_NAME + '_test', testVal = "OK";
215
216 self.key = PLUGIN_NAME + ed.id;
217
218 // Loop though each storage engine type until we find one that works
219 tinymce.each([
220 function() {
221 // Try HTML5 Local Storage
222 if (localStorage) {
223 localStorage.setItem(testKey, testVal);
224
225 if (localStorage.getItem(testKey) === testVal) {
226 localStorage.removeItem(testKey);
227
228 return localStorage;
229 }
230 }
231 },
232
233 function() {
234 // Try HTML5 Session Storage
235 if (sessionStorage) {
236 sessionStorage.setItem(testKey, testVal);
237
238 if (sessionStorage.getItem(testKey) === testVal) {
239 sessionStorage.removeItem(testKey);
240
241 return sessionStorage;
242 }
243 }
244 },
245
246 function() {
247 // Try IE userData
248 if (tinymce.isIE) {
249 ed.getElement().style.behavior = "url('#default#userData')";
250
251 // Fake localStorage on old IE
252 return {
253 autoExpires : TRUE,
254
255 setItem : function(key, value) {
256 var userDataElement = ed.getElement();
257
258 userDataElement.setAttribute(key, value);
259 userDataElement.expires = self.getExpDate();
260 userDataElement.save("TinyMCE");
261 },
262
263 getItem : function(key) {
264 var userDataElement = ed.getElement();
265
266 userDataElement.load("TinyMCE");
267
268 return userDataElement.getAttribute(key);
269 },
270
271 removeItem : function(key) {
272 ed.getElement().removeAttribute(key);
273 }
274 };
275 }
276 },
277 ], function(setup) {
278 // Try executing each function to find a suitable storage engine
279 try {
280 self.storage = setup();
281
282 if (self.storage)
283 return false;
284 } catch (e) {
285 // Ignore
286 }
287 });
288 },
289
290 /**
291 * This method will store the current contents in the the storage engine.
292 *
293 * @method storeDraft
294 */
295 storeDraft : function() {
296 var self = this, storage = self.storage, editor = self.editor, expires, content;
297
298 // Is the contents dirty
299 if (storage) {
300 // If there is no existing key and the contents hasn't been changed since
301 // it's original value then there is no point in saving a draft
302 if (!storage.getItem(self.key) && !editor.isDirty())
303 return;
304
305 // Store contents if the contents if longer than the minlength of characters
306 content = editor.getContent({draft: true});
307 if (content.length > editor.settings.autosave_minlength) {
308 expires = self.getExpDate();
309
310 // Store expiration date if needed IE userData has auto expire built in
311 if (!self.storage.autoExpires)
312 self.storage.setItem(self.key + "_expires", expires);
313
314 self.storage.setItem(self.key, content);
315 self.onStoreDraft.dispatch(self, {
316 expires : expires,
317 content : content
318 });
319 }
320 }
321 },
322
323 /**
324 * This method will restore the contents from the storage engine back to the editor.
325 *
326 * @method restoreDraft
327 */
328 restoreDraft : function() {
329 var self = this, storage = self.storage;
330
331 if (storage) {
332 content = storage.getItem(self.key);
333
334 if (content) {
335 self.editor.setContent(content);
336 self.onRestoreDraft.dispatch(self, {
337 content : content
338 });
339 }
340 }
341 },
342
343 /**
344 * This method will return true/false if there is a local storage draft available.
345 *
346 * @method hasDraft
347 * @return {boolean} true/false state if there is a local draft.
348 */
349 hasDraft : function() {
350 var self = this, storage = self.storage, expDate, exists;
351
352 if (storage) {
353 // Does the item exist at all
354 exists = !!storage.getItem(self.key);
355 if (exists) {
356 // Storage needs autoexpire
357 if (!self.storage.autoExpires) {
358 expDate = new Date(storage.getItem(self.key + "_expires"));
359
360 // Contents hasn't expired
361 if (new Date().getTime() < expDate.getTime())
362 return TRUE;
363
364 // Remove it if it has
365 self.removeDraft();
366 } else
367 return TRUE;
368 }
369 }
370
371 return false;
372 },
373
374 /**
375 * Removes the currently stored draft.
376 *
377 * @method removeDraft
378 */
379 removeDraft : function() {
380 var self = this, storage = self.storage, key = self.key, content;
381
382 if (storage) {
383 // Get current contents and remove the existing draft
384 content = storage.getItem(key);
385 storage.removeItem(key);
386 storage.removeItem(key + "_expires");
387
388 // Dispatch remove event if we had any contents
389 if (content) {
390 self.onRemoveDraft.dispatch(self, {
391 content : content
392 });
393 }
394 }
395 },
396
397 "static" : {
398 // Internal unload handler will be called before the page is unloaded
399 _beforeUnloadHandler : function(e) {
400 var msg;
401
402 tinymce.each(tinyMCE.editors, function(ed) {
403 // Store a draft for each editor instance
404 if (ed.plugins.autosave)
405 ed.plugins.autosave.storeDraft();
406
407 // Never ask in fullscreen mode
408 if (ed.getParam("fullscreen_is_enabled"))
409 return;
410
411 // Setup a return message if the editor is dirty
412 if (!msg && ed.isDirty() && ed.getParam("autosave_ask_before_unload"))
413 msg = ed.getLang("autosave.unload_msg");
414 });
415
416 return msg;
417 }
418 }
419 });
420
421 tinymce.PluginManager.add('autosave', tinymce.plugins.AutoSave);
422 })(tinymce);