wp-includes/js/quicktags.js

   1 /* global adminpage, wpActiveEditor, quicktagsL10n, wpLink, prompt */
   2 /*
   3  * Quicktags
   4  *
   5  * This is the HTML editor in WordPress. It can be attached to any textarea and will
   6  * append a toolbar above it. This script is self-contained (does not require external libraries).
   7  *
   8  * Run quicktags(settings) to initialize it, where settings is an object containing up to 3 properties:
   9  * settings = {
  10  *   id : 'my_id',          the HTML ID of the textarea, required
  11  *   buttons: ''            Comma separated list of the names of the default buttons to show. Optional.
  12  *                          Current list of default button names: 'strong,em,link,block,del,ins,img,ul,ol,li,code,more,close';
  13  * }
  14  *
  15  * The settings can also be a string quicktags_id.
  16  *
  17  * quicktags_id string The ID of the textarea that will be the editor canvas
  18  * buttons string Comma separated list of the default buttons names that will be shown in that instance.
  19  */
  20
  21 // new edit toolbar used with permission
  22 // by Alex King
  23 // http://www.alexking.org/
  24
  25 var QTags, edCanvas,
  26         edButtons = [];
  27
  28 /* jshint ignore:start */
  29
  30 /**
  31  * Back-compat
  32  *
  33  * Define all former global functions so plugins that hack quicktags.js directly don't cause fatal errors.
  34  */
  35 var edAddTag = function(){},
  36 edCheckOpenTags = function(){},
  37 edCloseAllTags = function(){},
  38 edInsertImage = function(){},
  39 edInsertLink = function(){},
  40 edInsertTag = function(){},
  41 edLink = function(){},
  42 edQuickLink = function(){},
  43 edRemoveTag = function(){},
  44 edShowButton = function(){},
  45 edShowLinks = function(){},
  46 edSpell = function(){},
  47 edToolbar = function(){};
  48
  49 /**
  50  * Initialize new instance of the Quicktags editor
  51  */
  52 function quicktags(settings) {
  53         return new QTags(settings);
  54 }
  55
  56 /**
  57  * Inserts content at the caret in the active editor (textarea)
  58  *
  59  * Added for back compatibility
  60  * @see QTags.insertContent()
  61  */
  62 function edInsertContent(bah, txt) {
  63         return QTags.insertContent(txt);
  64 }
  65
  66 /**
  67  * Adds a button to all instances of the editor
  68  *
  69  * Added for back compatibility, use QTags.addButton() as it gives more flexibility like type of button, button placement, etc.
  70  * @see QTags.addButton()
  71  */
  72 function edButton(id, display, tagStart, tagEnd, access) {
  73         return QTags.addButton( id, display, tagStart, tagEnd, access, '', -1 );
  74 }
  75
  76 /* jshint ignore:end */
  77
  78 (function(){
  79         // private stuff is prefixed with an underscore
  80         var _domReady = function(func) {
  81                 var t, i, DOMContentLoaded, _tryReady;
  82
  83                 if ( typeof jQuery !== 'undefined' ) {
  84                         jQuery(document).ready(func);
  85                 } else {
  86                         t = _domReady;
  87                         t.funcs = [];
  88
  89                         t.ready = function() {
  90                                 if ( ! t.isReady ) {
  91                                         t.isReady = true;
  92                                         for ( i = 0; i < t.funcs.length; i++ ) {
  93                                                 t.funcs[i]();
  94                                         }
  95                                 }
  96                         };
  97
  98                         if ( t.isReady ) {
  99                                 func();
 100                         } else {
 101                                 t.funcs.push(func);
 102                         }
 103
 104                         if ( ! t.eventAttached ) {
 105                                 if ( document.addEventListener ) {
 106                                         DOMContentLoaded = function(){document.removeEventListener('DOMContentLoaded', DOMContentLoaded, false);t.ready();};
 107                                         document.addEventListener('DOMContentLoaded', DOMContentLoaded, false);
 108                                         window.addEventListener('load', t.ready, false);
 109                                 } else if ( document.attachEvent ) {
 110                                         DOMContentLoaded = function(){if (document.readyState === 'complete'){ document.detachEvent('onreadystatechange', DOMContentLoaded);t.ready();}};
 111                                         document.attachEvent('onreadystatechange', DOMContentLoaded);
 112                                         window.attachEvent('onload', t.ready);
 113
 114                                         _tryReady = function() {
 115                                                 try {
 116                                                         document.documentElement.doScroll('left');
 117                                                 } catch(e) {
 118                                                         setTimeout(_tryReady, 50);
 119                                                         return;
 120                                                 }
 121
 122                                                 t.ready();
 123                                         };
 124                                         _tryReady();
 125                                 }
 126
 127                                 t.eventAttached = true;
 128                         }
 129                 }
 130         },
 131
 132         _datetime = (function() {
 133                 var now = new Date(), zeroise;
 134
 135                 zeroise = function(number) {
 136                         var str = number.toString();
 137
 138                         if ( str.length < 2 ) {
 139                                 str = '0' + str;
 140                         }
 141
 142                         return str;
 143                 };
 144
 145                 return now.getUTCFullYear() + '-' +
 146                         zeroise( now.getUTCMonth() + 1 ) + '-' +
 147                         zeroise( now.getUTCDate() ) + 'T' +
 148                         zeroise( now.getUTCHours() ) + ':' +
 149                         zeroise( now.getUTCMinutes() ) + ':' +
 150                         zeroise( now.getUTCSeconds() ) +
 151                         '+00:00';
 152         })(),
 153         qt;
 154
 155         qt = QTags = function(settings) {
 156                 if ( typeof(settings) === 'string' ) {
 157                         settings = {id: settings};
 158                 } else if ( typeof(settings) !== 'object' ) {
 159                         return false;
 160                 }
 161
 162                 var t = this,
 163                         id = settings.id,
 164                         canvas = document.getElementById(id),
 165                         name = 'qt_' + id,
 166                         tb, onclick, toolbar_id;
 167
 168                 if ( !id || !canvas ) {
 169                         return false;
 170                 }
 171
 172                 t.name = name;
 173                 t.id = id;
 174                 t.canvas = canvas;
 175                 t.settings = settings;
 176
 177                 if ( id === 'content' && typeof(adminpage) === 'string' && ( adminpage === 'post-new-php' || adminpage === 'post-php' ) ) {
 178                         // back compat hack :-(
 179                         edCanvas = canvas;
 180                         toolbar_id = 'ed_toolbar';
 181                 } else {
 182                         toolbar_id = name + '_toolbar';
 183                 }
 184
 185                 tb = document.createElement('div');
 186                 tb.id = toolbar_id;
 187                 tb.className = 'quicktags-toolbar';
 188                 tb.onclick = function() {
 189                         window.wpActiveEditor = id;
 190                 };
 191
 192                 canvas.parentNode.insertBefore(tb, canvas);
 193                 t.toolbar = tb;
 194
 195                 // listen for click events
 196                 onclick = function(e) {
 197                         e = e || window.event;
 198                         var target = e.target || e.srcElement, visible = target.clientWidth || target.offsetWidth, i;
 199
 200                         // don't call the callback on pressing the accesskey when the button is not visible
 201                         if ( !visible ) {
 202                                 return;
 203                         }
 204
 205                         // as long as it has the class ed_button, execute the callback
 206                         if ( / ed_button /.test(' ' + target.className + ' ') ) {
 207                                 // we have to reassign canvas here
 208                                 t.canvas = canvas = document.getElementById(id);
 209                                 i = target.id.replace(name + '_', '');
 210
 211                                 if ( t.theButtons[i] ) {
 212                                         t.theButtons[i].callback.call(t.theButtons[i], target, canvas, t);
 213                                 }
 214                         }
 215                 };
 216
 217                 if ( tb.addEventListener ) {
 218                         tb.addEventListener('click', onclick, false);
 219                 } else if ( tb.attachEvent ) {
 220                         tb.attachEvent('onclick', onclick);
 221                 }
 222
 223                 t.getButton = function(id) {
 224                         return t.theButtons[id];
 225                 };
 226
 227                 t.getButtonElement = function(id) {
 228                         return document.getElementById(name + '_' + id);
 229                 };
 230
 231                 qt.instances[id] = t;
 232
 233                 if ( ! qt.instances['0'] ) {
 234                         qt.instances['0'] = qt.instances[id];
 235                         _domReady( function(){ qt._buttonsInit(); } );
 236                 }
 237         };
 238
 239         qt.instances = {};
 240
 241         qt.getInstance = function(id) {
 242                 return qt.instances[id];
 243         };
 244
 245         qt._buttonsInit = function() {
 246                 var t = this, canvas, name, settings, theButtons, html, inst, ed, id, i, use,
 247                         defaults = ',strong,em,link,block,del,ins,img,ul,ol,li,code,more,close,';
 248
 249                 for ( inst in t.instances ) {
 250                         if ( '0' === inst ) {
 251                                 continue;
 252                         }
 253
 254                         ed = t.instances[inst];
 255                         canvas = ed.canvas;
 256                         name = ed.name;
 257                         settings = ed.settings;
 258                         html = '';
 259                         theButtons = {};
 260                         use = '';
 261
 262                         // set buttons
 263                         if ( settings.buttons ) {
 264                                 use = ','+settings.buttons+',';
 265                         }
 266
 267                         for ( i in edButtons ) {
 268                                 if ( !edButtons[i] ) {
 269                                         continue;
 270                                 }
 271
 272                                 id = edButtons[i].id;
 273                                 if ( use && defaults.indexOf( ',' + id + ',' ) !== -1 && use.indexOf( ',' + id + ',' ) === -1 ) {
 274                                         continue;
 275                                 }
 276
 277                                 if ( !edButtons[i].instance || edButtons[i].instance === inst ) {
 278                                         theButtons[id] = edButtons[i];
 279
 280                                         if ( edButtons[i].html ) {
 281                                                 html += edButtons[i].html(name + '_');
 282                                         }
 283                                 }
 284                         }
 285
 286                         if ( use && use.indexOf(',fullscreen,') !== -1 ) {
 287                                 theButtons.fullscreen = new qt.FullscreenButton();
 288                                 html += theButtons.fullscreen.html(name + '_');
 289                         }
 290
 291                         if ( use && use.indexOf(',dfw,') !== -1 ) {
 292                                 theButtons.dfw = new qt.DFWButton();
 293                                 html += theButtons.dfw.html( name + '_' );
 294                         }
 295
 296                         if ( 'rtl' === document.getElementsByTagName('html')[0].dir ) {
 297                                 theButtons.textdirection = new qt.TextDirectionButton();
 298                                 html += theButtons.textdirection.html(name + '_');
 299                         }
 300
 301                         ed.toolbar.innerHTML = html;
 302                         ed.theButtons = theButtons;
 303
 304                         if ( typeof jQuery !== 'undefined' ) {
 305                                 jQuery( document ).triggerHandler( 'quicktags-init', [ ed ] );
 306                         }
 307                 }
 308                 t.buttonsInitDone = true;
 309         };
 310
 311         /**
 312          * Main API function for adding a button to Quicktags
 313          *
 314          * Adds qt.Button or qt.TagButton depending on the args. The first three args are always required.
 315          * To be able to add button(s) to Quicktags, your script should be enqueued as dependent
 316          * on "quicktags" and outputted in the footer. If you are echoing JS directly from PHP,
 317          * use add_action( 'admin_print_footer_scripts', 'output_my_js', 100 ) or add_action( 'wp_footer', 'output_my_js', 100 )
 318          *
 319          * Minimum required to add a button that calls an external function:
 320          *     QTags.addButton( 'my_id', 'my button', my_callback );
 321          *     function my_callback() { alert('yeah!'); }
 322          *
 323          * Minimum required to add a button that inserts a tag:
 324          *     QTags.addButton( 'my_id', 'my button', '<span>', '</span>' );
 325          *     QTags.addButton( 'my_id2', 'my button', '<br />' );
 326          *
 327          * @param string id Required. Button HTML ID
 328          * @param string display Required. Button's value="..."
 329          * @param string|function arg1 Required. Either a starting tag to be inserted like "<span>" or a callback that is executed when the button is clicked.
 330          * @param string arg2 Optional. Ending tag like "</span>"
 331          * @param string access_key Deprecated Not used
 332          * @param string title Optional. Button's title="..."
 333          * @param int priority Optional. Number representing the desired position of the button in the toolbar. 1 - 9 = first, 11 - 19 = second, 21 - 29 = third, etc.
 334          * @param string instance Optional. Limit the button to a specific instance of Quicktags, add to all instances if not present.
 335          * @return mixed null or the button object that is needed for back-compat.
 336          */
 337         qt.addButton = function( id, display, arg1, arg2, access_key, title, priority, instance ) {
 338                 var btn;
 339
 340                 if ( !id || !display ) {
 341                         return;
 342                 }
 343
 344                 priority = priority || 0;
 345                 arg2 = arg2 || '';
 346
 347                 if ( typeof(arg1) === 'function' ) {
 348                         btn = new qt.Button(id, display, access_key, title, instance);
 349                         btn.callback = arg1;
 350                 } else if ( typeof(arg1) === 'string' ) {
 351                         btn = new qt.TagButton(id, display, arg1, arg2, access_key, title, instance);
 352                 } else {
 353                         return;
 354                 }
 355
 356                 if ( priority === -1 ) { // back-compat
 357                         return btn;
 358                 }
 359
 360                 if ( priority > 0 ) {
 361                         while ( typeof(edButtons[priority]) !== 'undefined' ) {
 362                                 priority++;
 363                         }
 364
 365                         edButtons[priority] = btn;
 366                 } else {
 367                         edButtons[edButtons.length] = btn;
 368                 }
 369
 370                 if ( this.buttonsInitDone ) {
 371                         this._buttonsInit(); // add the button HTML to all instances toolbars if addButton() was called too late
 372                 }
 373         };
 374
 375         qt.insertContent = function(content) {
 376                 var sel, startPos, endPos, scrollTop, text, canvas = document.getElementById(wpActiveEditor);
 377
 378                 if ( !canvas ) {
 379                         return false;
 380                 }
 381
 382                 if ( document.selection ) { //IE
 383                         canvas.focus();
 384                         sel = document.selection.createRange();
 385                         sel.text = content;
 386                         canvas.focus();
 387                 } else if ( canvas.selectionStart || canvas.selectionStart === 0 ) { // FF, WebKit, Opera
 388                         text = canvas.value;
 389                         startPos = canvas.selectionStart;
 390                         endPos = canvas.selectionEnd;
 391                         scrollTop = canvas.scrollTop;
 392
 393                         canvas.value = text.substring(0, startPos) + content + text.substring(endPos, text.length);
 394
 395                         canvas.selectionStart = startPos + content.length;
 396                         canvas.selectionEnd = startPos + content.length;
 397                         canvas.scrollTop = scrollTop;
 398                         canvas.focus();
 399                 } else {
 400                         canvas.value += content;
 401                         canvas.focus();
 402                 }
 403                 return true;
 404         };
 405
 406         // a plain, dumb button
 407         qt.Button = function(id, display, access, title, instance) {
 408                 var t = this;
 409                 t.id = id;
 410                 t.display = display;
 411                 t.access = '';
 412                 t.title = title || '';
 413                 t.instance = instance || '';
 414         };
 415         qt.Button.prototype.html = function(idPrefix) {
 416                 var title = this.title ? ' title="' + this.title + '"' : '',
 417                         active, on, wp,
 418                         dfw = ( wp = window.wp ) && wp.editor && wp.editor.dfw;
 419
 420                 if ( this.id === 'fullscreen' ) {
 421                         return '<button type="button" id="' + idPrefix + this.id + '" class="ed_button qt-dfw qt-fullscreen"' + title + '></button>';
 422                 } else if ( this.id === 'dfw' ) {
 423                         active = dfw && dfw.isActive() ? '' : ' disabled="disabled"';
 424                         on = dfw && dfw.isOn() ? ' active' : '';
 425
 426                         return '<button type="button" id="' + idPrefix + this.id + '" class="ed_button qt-dfw' + on + '"' + title + active + '></button>';
 427                 }
 428
 429                 return '<input type="button" id="' + idPrefix + this.id + '" class="ed_button button button-small"' + title + ' value="' + this.display + '" />';
 430         };
 431         qt.Button.prototype.callback = function(){};
 432
 433         // a button that inserts HTML tag
 434         qt.TagButton = function(id, display, tagStart, tagEnd, access, title, instance) {
 435                 var t = this;
 436                 qt.Button.call(t, id, display, access, title, instance);
 437                 t.tagStart = tagStart;
 438                 t.tagEnd = tagEnd;
 439         };
 440         qt.TagButton.prototype = new qt.Button();
 441         qt.TagButton.prototype.openTag = function(e, ed) {
 442                 var t = this;
 443
 444                 if ( ! ed.openTags ) {
 445                         ed.openTags = [];
 446                 }
 447                 if ( t.tagEnd ) {
 448                         ed.openTags.push(t.id);
 449                         e.value = '/' + e.value;
 450                 }
 451         };
 452         qt.TagButton.prototype.closeTag = function(e, ed) {
 453                 var t = this, i = t.isOpen(ed);
 454
 455                 if ( i !== false ) {
 456                         ed.openTags.splice(i, 1);
 457                 }
 458
 459                 e.value = t.display;
 460         };
 461         // whether a tag is open or not. Returns false if not open, or current open depth of the tag
 462         qt.TagButton.prototype.isOpen = function (ed) {
 463                 var t = this, i = 0, ret = false;
 464                 if ( ed.openTags ) {
 465                         while ( ret === false && i < ed.openTags.length ) {
 466                                 ret = ed.openTags[i] === t.id ? i : false;
 467                                 i ++;
 468                         }
 469                 } else {
 470                         ret = false;
 471                 }
 472                 return ret;
 473         };
 474         qt.TagButton.prototype.callback = function(element, canvas, ed) {
 475                 var t = this, startPos, endPos, cursorPos, scrollTop, v = canvas.value, l, r, i, sel, endTag = v ? t.tagEnd : '';
 476
 477                 if ( document.selection ) { // IE
 478                         canvas.focus();
 479                         sel = document.selection.createRange();
 480                         if ( sel.text.length > 0 ) {
 481                                 if ( !t.tagEnd ) {
 482                                         sel.text = sel.text + t.tagStart;
 483                                 } else {
 484                                         sel.text = t.tagStart + sel.text + endTag;
 485                                 }
 486                         } else {
 487                                 if ( !t.tagEnd ) {
 488                                         sel.text = t.tagStart;
 489                                 } else if ( t.isOpen(ed) === false ) {
 490                                         sel.text = t.tagStart;
 491                                         t.openTag(element, ed);
 492                                 } else {
 493                                         sel.text = endTag;
 494                                         t.closeTag(element, ed);
 495                                 }
 496                         }
 497                         canvas.focus();
 498                 } else if ( canvas.selectionStart || canvas.selectionStart === 0 ) { // FF, WebKit, Opera
 499                         startPos = canvas.selectionStart;
 500                         endPos = canvas.selectionEnd;
 501                         cursorPos = endPos;
 502                         scrollTop = canvas.scrollTop;
 503                         l = v.substring(0, startPos); // left of the selection
 504                         r = v.substring(endPos, v.length); // right of the selection
 505                         i = v.substring(startPos, endPos); // inside the selection
 506                         if ( startPos !== endPos ) {
 507                                 if ( !t.tagEnd ) {
 508                                         canvas.value = l + i + t.tagStart + r; // insert self closing tags after the selection
 509                                         cursorPos += t.tagStart.length;
 510                                 } else {
 511                                         canvas.value = l + t.tagStart + i + endTag + r;
 512                                         cursorPos += t.tagStart.length + endTag.length;
 513                                 }
 514                         } else {
 515                                 if ( !t.tagEnd ) {
 516                                         canvas.value = l + t.tagStart + r;
 517                                         cursorPos = startPos + t.tagStart.length;
 518                                 } else if ( t.isOpen(ed) === false ) {
 519                                         canvas.value = l + t.tagStart + r;
 520                                         t.openTag(element, ed);
 521                                         cursorPos = startPos + t.tagStart.length;
 522                                 } else {
 523                                         canvas.value = l + endTag + r;
 524                                         cursorPos = startPos + endTag.length;
 525                                         t.closeTag(element, ed);
 526                                 }
 527                         }
 528
 529                         canvas.selectionStart = cursorPos;
 530                         canvas.selectionEnd = cursorPos;
 531                         canvas.scrollTop = scrollTop;
 532                         canvas.focus();
 533                 } else { // other browsers?
 534                         if ( !endTag ) {
 535                                 canvas.value += t.tagStart;
 536                         } else if ( t.isOpen(ed) !== false ) {
 537                                 canvas.value += t.tagStart;
 538                                 t.openTag(element, ed);
 539                         } else {
 540                                 canvas.value += endTag;
 541                                 t.closeTag(element, ed);
 542                         }
 543                         canvas.focus();
 544                 }
 545         };
 546
 547         // removed
 548         qt.SpellButton = function() {};
 549
 550         // the close tags button
 551         qt.CloseButton = function() {
 552                 qt.Button.call(this, 'close', quicktagsL10n.closeTags, '', quicktagsL10n.closeAllOpenTags);
 553         };
 554
 555         qt.CloseButton.prototype = new qt.Button();
 556
 557         qt._close = function(e, c, ed) {
 558                 var button, element, tbo = ed.openTags;
 559
 560                 if ( tbo ) {
 561                         while ( tbo.length > 0 ) {
 562                                 button = ed.getButton(tbo[tbo.length - 1]);
 563                                 element = document.getElementById(ed.name + '_' + button.id);
 564
 565                                 if ( e ) {
 566                                         button.callback.call(button, element, c, ed);
 567                                 } else {
 568                                         button.closeTag(element, ed);
 569                                 }
 570                         }
 571                 }
 572         };
 573
 574         qt.CloseButton.prototype.callback = qt._close;
 575
 576         qt.closeAllTags = function(editor_id) {
 577                 var ed = this.getInstance(editor_id);
 578                 qt._close('', ed.canvas, ed);
 579         };
 580
 581         // the link button
 582         qt.LinkButton = function() {
 583                 qt.TagButton.call(this, 'link', 'link', '', '</a>');
 584         };
 585         qt.LinkButton.prototype = new qt.TagButton();
 586         qt.LinkButton.prototype.callback = function(e, c, ed, defaultValue) {
 587                 var URL, t = this;
 588
 589                 if ( typeof wpLink !== 'undefined' ) {
 590                         wpLink.open( ed.id );
 591                         return;
 592                 }
 593
 594                 if ( ! defaultValue ) {
 595                         defaultValue = 'http://';
 596                 }
 597
 598                 if ( t.isOpen(ed) === false ) {
 599                         URL = prompt(quicktagsL10n.enterURL, defaultValue);
 600                         if ( URL ) {
 601                                 t.tagStart = '<a href="' + URL + '">';
 602                                 qt.TagButton.prototype.callback.call(t, e, c, ed);
 603                         }
 604                 } else {
 605                         qt.TagButton.prototype.callback.call(t, e, c, ed);
 606                 }
 607         };
 608
 609         // the img button
 610         qt.ImgButton = function() {
 611                 qt.TagButton.call(this, 'img', 'img', '', '');
 612         };
 613         qt.ImgButton.prototype = new qt.TagButton();
 614         qt.ImgButton.prototype.callback = function(e, c, ed, defaultValue) {
 615                 if ( ! defaultValue ) {
 616                         defaultValue = 'http://';
 617                 }
 618                 var src = prompt(quicktagsL10n.enterImageURL, defaultValue), alt;
 619                 if ( src ) {
 620                         alt = prompt(quicktagsL10n.enterImageDescription, '');
 621                         this.tagStart = '<img src="' + src + '" alt="' + alt + '" />';
 622                         qt.TagButton.prototype.callback.call(this, e, c, ed);
 623                 }
 624         };
 625
 626         qt.FullscreenButton = function() {
 627                 qt.Button.call(this, 'fullscreen', quicktagsL10n.fullscreen, 'f', quicktagsL10n.toggleFullscreen);
 628         };
 629         qt.FullscreenButton.prototype = new qt.Button();
 630         qt.FullscreenButton.prototype.callback = function(e, c) {
 631                 if ( ! c.id || typeof wp === 'undefined' || ! wp.editor || ! wp.editor.fullscreen ) {
 632                         return;
 633                 }
 634
 635                 wp.editor.fullscreen.on();
 636         };
 637
 638         qt.DFWButton = function() {
 639                 qt.Button.call( this, 'dfw', '', 'f', quicktagsL10n.dfw );
 640         };
 641         qt.DFWButton.prototype = new qt.Button();
 642         qt.DFWButton.prototype.callback = function() {
 643                 var wp;
 644
 645                 if ( ! ( wp = window.wp ) || ! wp.editor || ! wp.editor.dfw ) {
 646                         return;
 647                 }
 648
 649                 window.wp.editor.dfw.toggle();
 650         };
 651
 652         qt.TextDirectionButton = function() {
 653                 qt.Button.call(this, 'textdirection', quicktagsL10n.textdirection, '', quicktagsL10n.toggleTextdirection);
 654         };
 655         qt.TextDirectionButton.prototype = new qt.Button();
 656         qt.TextDirectionButton.prototype.callback = function(e, c) {
 657                 var isRTL = ( 'rtl' === document.getElementsByTagName('html')[0].dir ),
 658                         currentDirection = c.style.direction;
 659
 660                 if ( ! currentDirection ) {
 661                         currentDirection = ( isRTL ) ? 'rtl' : 'ltr';
 662                 }
 663
 664                 c.style.direction = ( 'rtl' === currentDirection ) ? 'ltr' : 'rtl';
 665                 c.focus();
 666         };
 667
 668         // ensure backward compatibility
 669         edButtons[10] = new qt.TagButton('strong','b','<strong>','</strong>');
 670         edButtons[20] = new qt.TagButton('em','i','<em>','</em>'),
 671         edButtons[30] = new qt.LinkButton(), // special case
 672         edButtons[40] = new qt.TagButton('block','b-quote','\n\n<blockquote>','</blockquote>\n\n'),
 673         edButtons[50] = new qt.TagButton('del','del','<del datetime="' + _datetime + '">','</del>'),
 674         edButtons[60] = new qt.TagButton('ins','ins','<ins datetime="' + _datetime + '">','</ins>'),
 675         edButtons[70] = new qt.ImgButton(), // special case
 676         edButtons[80] = new qt.TagButton('ul','ul','<ul>\n','</ul>\n\n'),
 677         edButtons[90] = new qt.TagButton('ol','ol','<ol>\n','</ol>\n\n'),
 678         edButtons[100] = new qt.TagButton('li','li','\t<li>','</li>\n'),
 679         edButtons[110] = new qt.TagButton('code','code','<code>','</code>'),
 680         edButtons[120] = new qt.TagButton('more','more','<!--more-->\n\n',''),
 681         edButtons[140] = new qt.CloseButton();
 682
 683 })();