modules/documentCanvas/canvas/canvas.js

   1 define([
   2 'libs/jquery-1.9.1.min',
   3 'libs/underscore-min',
   4 'libs/backbone-min',
   5 'modules/documentCanvas/canvas/documentElement',
   6 'modules/documentCanvas/canvas/utils'
   7 ], function($, _, Backbone, documentElement, utils) {
   8
   9 'use strict';
  10
  11 var Canvas = function(wlxml, publisher) {
  12     this.eventBus = _.extend({}, Backbone.Events);
  13     this.loadWlxml(wlxml);
  14     this.publisher = publisher ? publisher : function() {};
  15 };
  16
  17 $.extend(Canvas.prototype, {
  18
  19     loadWlxml: function(wlxml) {
  20         var d = wlxml ? $($.trim(wlxml)) : null;
  21         if(d) {
  22             this.wrapper = $('<div>').addClass('canvas-wrapper').attr('contenteditable', true);
  23             this.wrapper.append(d);
  24             var canvas = this;
  25
  26             this.wrapper.find('*').replaceWith(function() {
  27                 var currentTag = $(this);
  28                 if(currentTag.attr('wlxml-tag'))
  29                     return;
  30
  31                 var meta = {}, others = {};
  32                 for(var i = 0; i < this.attributes.length; i++) {
  33                     var attr = this.attributes[i];
  34                     if(attr.name.substr(0, 5) === 'meta-')
  35                         meta[attr.name.substr(5)] = attr.value;
  36                     else if(attr.name !== 'class')
  37                         others[attr.name] = attr.value;
  38                 }
  39
  40                 var element = documentElement.DocumentNodeElement.create({
  41                     tag: currentTag.prop('tagName').toLowerCase(),
  42                     klass: currentTag.attr('class'),
  43                     meta: meta,
  44                     others: others,
  45                     rawChildren: currentTag.contents(),
  46                     prepopulateOnEmpty: true
  47                 }, canvas);
  48
  49                 ['orig-before', 'orig-after', 'orig-begin', 'orig-end'].forEach(function(attr) {
  50                     element.data(attr, '');
  51                 });
  52                 return element.dom();
  53             });
  54
  55             var FIRST_CONTENT_INDEX = 0;
  56
  57             // @@ TODO - refactor!
  58             var getNode = function(element) {
  59                 return element.children('[document-element-content]');
  60             }
  61
  62             this.wrapper.find(':not(iframe)').addBack().contents()
  63                 .filter(function() {return this.nodeType === Node.TEXT_NODE})
  64                 .each(function() {
  65
  66                     // TODO: use DocumentElement API
  67
  68                     var el = $(this),
  69                         text = {original: el.text(), trimmed: $.trim(el.text())},
  70                         elParent = el.parent(),
  71                         hasSpanParent = elParent.attr('wlxml-tag') === 'span',
  72                         hasSpanBefore = el.prev().length > 0  && getNode($(el.prev()[0])).attr('wlxml-tag') === 'span',
  73                         hasSpanAfter = el.next().length > 0 && getNode($(el.next()[0])).attr('wlxml-tag') === 'span';
  74
  75                     if(el.parent().hasClass('canvas-widget') || elParent.attr('document-text-element') !== undefined)
  76                         return true; // continue
  77
  78                     var addInfo = function(toAdd, where) {
  79                         var parentContents = elParent.contents(),
  80                             idx = parentContents.index(el[0]),
  81                             prev = idx > FIRST_CONTENT_INDEX ? parentContents[idx-1] : null,
  82                             next = idx < parentContents.length - 1 ? parentContents[idx+1] : null,
  83                             target, key;
  84
  85                         if(where === 'above') {
  86                             target = prev ? $(prev) : elParent.parent();
  87                             key = prev ? 'orig-after' : 'orig-begin';
  88                         } else if(where === 'below') {
  89                             target = next ? $(next) : elParent.parent();
  90                             key = next ? 'orig-before' : 'orig-end';
  91                         } else { throw new Object;}
  92
  93                         target.data(key, toAdd);
  94                     }
  95
  96                     text.transformed = text.trimmed;
  97
  98                     if(hasSpanParent || hasSpanBefore || hasSpanAfter) {
  99                         var startSpace = /\s/g.test(text.original.substr(0,1)),
 100                             endSpace = /\s/g.test(text.original.substr(-1)) && text.original.length > 1;
 101                         text.transformed = (startSpace && (hasSpanParent || hasSpanBefore) ? ' ' : '')
 102                                     + text.trimmed
 103                                     + (endSpace && (hasSpanParent || hasSpanAfter) ? ' ' : '');
 104                     } else {
 105                         if(text.trimmed.length === 0 && text.original.length > 0 && elParent.contents().length === 1)
 106                             text.transformed = ' ';
 107                     }
 108
 109                     if(!text.transformed) {
 110                         addInfo(text.original, 'below');
 111                         el.remove();
 112                         return true; // continue
 113                     }
 114
 115                     if(text.transformed !== text.original) {
 116                         if(!text.trimmed) {
 117                             addInfo(text.original, 'below');
 118                         } else {
 119                             var startingMatch = text.original.match(/^\s+/g),
 120                                 endingMatch = text.original.match(/\s+$/g),
 121                                 startingWhiteSpace = startingMatch ? startingMatch[0] : null,
 122                                 endingWhiteSpace = endingMatch ? endingMatch[0] : null;
 123
 124                             if(endingWhiteSpace) {
 125                                 if(text.transformed[text.transformed.length - 1] === ' ' && endingWhiteSpace[0] === ' ')
 126                                     endingWhiteSpace = endingWhiteSpace.substr(1);
 127                                 addInfo(endingWhiteSpace, 'below');
 128                             }
 129
 130                             if(startingWhiteSpace) {
 131                                 if(text.transformed[0] === ' ' && startingWhiteSpace[startingWhiteSpace.length-1] === ' ')
 132                                     startingWhiteSpace = startingWhiteSpace.substr(0, startingWhiteSpace.length -1);
 133                                 addInfo(startingWhiteSpace, 'above');
 134                             }
 135                         }
 136                     }
 137
 138                     var element = documentElement.DocumentTextElement.create({text: text.transformed});
 139                     el.replaceWith(element.dom());
 140                 });
 141
 142             this.d = this.wrapper.children(0);
 143
 144             var KEYS = {
 145                 ENTER: 13,
 146                 ARROW_LEFT: 37,
 147                 ARROW_UP: 38,
 148                 ARROW_RIGHT: 39,
 149                 ARROW_DOWN: 40,
 150                 BACKSPACE: 8,
 151                 DELETE: 46,
 152                 X: 88
 153             }
 154
 155             this.wrapper.on('keyup', function(e) {
 156                 if(e.which >= 37 && e.which <= 40) {
 157                     var element = canvas.getCursor().getPosition().element,
 158                         caretTo = false;
 159                     if(!element) {
 160                         // Chrome hack
 161                         var direction;
 162                         if(e.which === KEYS.ARROW_LEFT  || e.which === KEYS.ARROW_UP) {
 163                             direction = 'above';
 164                             caretTo = 'end';
 165                         } else {
 166                             direction = 'below';
 167                             caretTo = 'start';
 168                         }
 169                         element = canvas.getDocumentElement(utils.nearestInDocumentOrder('[document-text-element]:visible', direction, window.getSelection().focusNode));
 170                     }
 171                     canvas.setCurrentElement(element, {caretTo: caretTo});
 172                 }
 173             });
 174
 175             this.wrapper.on('keydown', function(e) {
 176                 var cursor = canvas.getCursor(),
 177                     position = canvas.getCursor().getPosition(),
 178                     element = position.element;
 179                 if(e.which >= 37 && e.which <= 40) {
 180
 181                     if(element && (element instanceof documentElement.DocumentTextElement)) {
 182                         if(element.isEmpty()) {
 183                             var direction, caretTo;
 184                             if(e.which === KEYS.ARROW_LEFT  || e.which === KEYS.ARROW_UP) {
 185                                 direction = 'above';
 186                                 caretTo = 'end';
 187                             } else {
 188                                 direction = 'below';
 189                                 caretTo = 'start';
 190                             }
 191                             var el = canvas.getDocumentElement(utils.nearestInDocumentOrder('[document-text-element]', direction, window.getSelection().focusNode))
 192                             canvas.setCurrentElement(element, {caretTo: caretTo});
 193                         } else {
 194                             var txt = element.dom().contents()[0].data;
 195                             if(e.which === KEYS.ARROW_LEFT && position.offset > 1 && txt.charAt(position.offset-2) === utils.unicode.ZWS) {
 196                                 e.preventDefault();
 197                                 canvas._moveCaretToTextElement(element, position.offset-2);
 198                             }
 199                             if(e.which === KEYS.ARROW_RIGHT && position.offset < txt.length - 1 && txt.charAt(position.offset+1) === utils.unicode.ZWS) {
 200                                 e.preventDefault();
 201                                 canvas._moveCaretToTextElement(element, position.offset+2);
 202                             }
 203                         }
 204                     }
 205
 206
 207                 }
 208
 209                 var selectsWholeTextElement = function() {
 210                     if(cursor.isSelecting() && cursor.getSelectionStart().offsetAtBeginning && cursor.getSelectionEnd().offsetAtEnd)
 211                         return true;
 212                     return false;
 213                 }
 214
 215                 if(e.which === KEYS.X && e.ctrlKey && selectsWholeTextElement()) {
 216                     e.preventDefault();
 217                 }
 218
 219                 if(e.which === KEYS.BACKSPACE || e.which === KEYS.DELETE) {
 220                     if(cursor.isSelecting() && !cursor.isSelectingWithinElement()) {
 221                         e.preventDefault();
 222                         return;
 223                     }
 224
 225                     var cursorAtOperationEdge = position.offsetAtBeginning;
 226                     if(e.which === KEYS.DELETE) {
 227                         cursorAtOperationEdge = position.offsetAtEnd;
 228                     }
 229
 230                     if(element.getText().length === 1 || selectsWholeTextElement()) {
 231                         e.preventDefault();
 232                         element.setText('');
 233                     }
 234                     else if(element.isEmpty()) {
 235
 236                         var direction = 'above',
 237                             caretTo = 'end';
 238
 239                         if(e.which === KEYS.DELETE) {
 240                             direction = 'below';
 241                             caretTo = 'start';
 242                         }
 243
 244                         e.preventDefault();
 245
 246                         var parent = element.parent(),
 247                             grandParent = parent ? parent.parent() : null,
 248                             goto;
 249                         if(parent.children().length === 1 && parent.children()[0].sameNode(element)) {
 250                             if(grandParent && grandParent.children().length === 1) {
 251                                 goto = grandParent.append({text: ''});
 252                             } else {
 253                                 goto = canvas.getDocumentElement(utils.nearestInDocumentOrder('[document-text-element]', direction, element.dom()[0]));
 254                             }
 255                             parent.detach();
 256                         } else {
 257                             goto = canvas.getDocumentElement(utils.nearestInDocumentOrder('[document-text-element]', direction, element.dom()[0]));
 258                             element.detach();
 259                         }
 260                         canvas.setCurrentElement(goto, {caretTo: caretTo});
 261                         canvas.publisher('contentChanged');
 262                     }
 263                     else if(cursorAtOperationEdge) {
 264                         // todo
 265                         e.preventDefault();
 266                     }
 267                 }
 268
 269                 if(e.which === KEYS.ENTER) {
 270                     e.preventDefault();
 271                     var cursor = canvas.getCursor(),
 272                         position = cursor.getPosition(),
 273                         element = position.element;
 274
 275                     if(!cursor.isSelecting()) {
 276                         if(e.ctrlKey) {
 277                             var added = element.after({tag: 'block'});
 278                             added.append({text:''});
 279                             canvas.setCurrentElement(added, {caretTo: 'start'});
 280
 281                         } else {
 282
 283                             if(!(element.parent().parent())) {
 284                                 return false; // top level element is unsplittable
 285                             }
 286
 287                             var elements = position.element.split({offset: position.offset}),
 288                                 newEmpty,
 289                                 goto,
 290                                 gotoOptions;
 291
 292                             if(position.offsetAtBeginning)
 293                                 newEmpty = elements.first;
 294                             else if(position.offsetAtEnd)
 295                                 newEmpty = elements.second;
 296
 297                             if(newEmpty) {
 298                                 goto = newEmpty.append(documentElement.DocumentTextElement.create({text: ''}, this));
 299                                 gotoOptions = {};
 300                             } else {
 301                                 goto = elements.second;
 302                                 gotoOptions = {caretTo: 'start'};
 303                             }
 304
 305                             canvas.setCurrentElement(goto, gotoOptions);
 306                         }
 307                     }
 308                 }
 309             });
 310
 311             this.wrapper.on('click', '[document-node-element], [document-text-element]', function(e) {
 312                 e.stopPropagation();
 313                 canvas.setCurrentElement(canvas.getDocumentElement(e.currentTarget), {caretTo: false});
 314             });
 315
 316             var observer = new MutationObserver(function(mutations) {
 317                 mutations.forEach(function(mutation) {
 318                     if(documentElement.DocumentTextElement.isContentContainer(mutation.target)) {
 319                         if(mutation.target.data === '')
 320                             mutation.target.data = utils.unicode.ZWS;
 321                         canvas.publisher('contentChanged');
 322                     }
 323                 });
 324             });
 325             var config = { attributes: false, childList: false, characterData: true, subtree: true, characterDataOldValue: true};
 326             observer.observe(this.d[0], config);
 327
 328
 329             this.wrapper.on('mouseover', '[document-node-element], [document-text-element]', function(e) {
 330                 var el = canvas.getDocumentElement(e.currentTarget);
 331                 if(!el)
 332                     return;
 333                 e.stopPropagation();
 334                 if(el instanceof documentElement.DocumentTextElement)
 335                     el = el.parent();
 336                 el.toggleLabel(true);
 337             });
 338             this.wrapper.on('mouseout', '[document-node-element], [document-text-element]', function(e) {
 339                 var el = canvas.getDocumentElement(e.currentTarget);
 340                 if(!el)
 341                     return;
 342                 e.stopPropagation();
 343                 if(el instanceof documentElement.DocumentTextElement)
 344                     el = el.parent();
 345                 el.toggleLabel(false);
 346             });
 347
 348             this.eventBus.on('elementToggled', function(toggle, element) {
 349                 if(!toggle) {
 350                     element = canvas.getDocumentElement(utils.nearestInDocumentOrder('[document-text-element]:visible', 'above', element.dom()[0]));
 351                     canvas.setCurrentElement(element);
 352                 }
 353             })
 354
 355         } else {
 356             this.d = null;
 357         }
 358     },
 359
 360     view: function() {
 361         return this.wrapper;
 362     },
 363
 364     doc: function() {
 365         if(this.d === null)
 366             return null;
 367         return documentElement.DocumentNodeElement.fromHTMLElement(this.d.get(0), this); //{wlxmlTag: this.d.prop('tagName')};
 368     },
 369
 370     wrapText: function(params) {
 371         params = _.extend({textNodeIdx: 0}, params);
 372         if(typeof params.textNodeIdx === 'number')
 373             params.textNodeIdx = [params.textNodeIdx];
 374
 375         var childrenInside = params.inside.children(),
 376             idx1 = Math.min.apply(Math, params.textNodeIdx),
 377             idx2 = Math.max.apply(Math, params.textNodeIdx),
 378             textNode1 = childrenInside[idx1],
 379             textNode2 = childrenInside[idx2],
 380             sameNode = textNode1.sameNode(textNode2),
 381             prefixOutside = textNode1.getText().substr(0, params.offsetStart),
 382             prefixInside = textNode1.getText().substr(params.offsetStart),
 383             suffixInside = textNode2.getText().substr(0, params.offsetEnd),
 384             suffixOutside = textNode2.getText().substr(params.offsetEnd)
 385         ;
 386
 387         var wrapperElement = documentElement.DocumentNodeElement.create({tag: params._with.tag, klass: params._with.klass});
 388         textNode1.after(wrapperElement);
 389         textNode1.detach();
 390
 391         if(prefixOutside.length > 0)
 392             wrapperElement.before({text:prefixOutside});
 393         if(sameNode) {
 394             var core = textNode1.getText().substr(params.offsetStart, params.offsetEnd - params.offsetStart);
 395             wrapperElement.append({text: core});
 396         } else {
 397             textNode2.detach();
 398             if(prefixInside.length > 0)
 399                 wrapperElement.append({text: prefixInside});
 400             for(var i = idx1 + 1; i < idx2; i++) {
 401                 wrapperElement.append(childrenInside[i]);
 402             }
 403             if(suffixInside.length > 0)
 404                 wrapperElement.append({text: suffixInside});
 405         }
 406         if(suffixOutside.length > 0)
 407             wrapperElement.after({text: suffixOutside});
 408         return wrapperElement;
 409     },
 410
 411     wrapElements: function(params) {
 412         if(!(params.element1.parent().sameNode(params.element2.parent())))
 413             return;
 414
 415         var parent = params.element1.parent(),
 416             parentChildren = parent.children(),
 417             wrapper = documentElement.DocumentNodeElement.create({
 418                 tag: params._with.tag,
 419                 klass: params._with.klass}),
 420             idx1 = parent.childIndex(params.element1),
 421             idx2 = parent.childIndex(params.element2);
 422
 423         if(idx1 > idx2) {
 424             var tmp = idx1;
 425             idx1 = idx2;
 426             idx2 = tmp;
 427         }
 428
 429         var insertingMethod, insertingTarget;
 430         if(idx1 === 0) {
 431             insertingMethod = 'prepend';
 432             insertingTarget = parent;
 433         } else {
 434             insertingMethod = 'after';
 435             insertingTarget = parentChildren[idx1-1];
 436         }
 437
 438         for(var i = idx1; i <= idx2; i++) {
 439             wrapper.append(parentChildren[i].detach());
 440         }
 441
 442         insertingTarget[insertingMethod](wrapper);
 443         return wrapper;
 444     },
 445
 446     getSiblingParents: function(params) {
 447         var parents1 = [params.element1].concat(params.element1.parents()).reverse(),
 448             parents2 = [params.element2].concat(params.element2.parents()).reverse(),
 449             noSiblingParents = null;
 450
 451         if(parents1.length === 0 || parents2.length === 0 || !(parents1[0].sameNode(parents2[0])))
 452             return noSiblingParents;
 453
 454         var i;
 455         for(i = 0; i < Math.min(parents1.length, parents2.length); i++) {
 456             if(parents1[i].sameNode(parents2[i]))
 457                 continue;
 458             break;
 459         }
 460         return {element1: parents1[i], element2: parents2[i]};
 461     },
 462
 463     getDocumentElement: function(from) {
 464         if(from instanceof HTMLElement || from instanceof Text) {
 465            return documentElement.DocumentElement.fromHTMLElement(from, this);
 466         }
 467     },
 468     getCursor: function() {
 469         return new Cursor(this);
 470     },
 471
 472     list: {},
 473
 474
 475     getCurrentNodeElement: function() {
 476         return this.getDocumentElement(this.wrapper.find('.current-node-element').parent()[0]);
 477     },
 478
 479     getCurrentTextElement: function() {
 480         return this.getDocumentElement(this.wrapper.find('.current-text-element')[0]);
 481     },
 482
 483
 484
 485     setCurrentElement: function(element, params) {
 486         params = _.extend({caretTo: 'end'}, params);
 487         var findFirstDirectTextChild = function(e, nodeToLand) {
 488             var byBrowser = this.getCursor().getPosition().element;
 489             if(byBrowser && byBrowser.parent().sameNode(nodeToLand))
 490                 return byBrowser;
 491             var children = e.children();
 492             for(var i = 0; i < children.length; i++) {
 493                 if(children[i] instanceof documentElement.DocumentTextElement)
 494                     return children[i];
 495             }
 496             return null;
 497         }.bind(this);
 498         var _markAsCurrent = function(element) {
 499             if(element instanceof documentElement.DocumentTextElement) {
 500                 this.wrapper.find('.current-text-element').removeClass('current-text-element');
 501                 element.dom().addClass('current-text-element');
 502             } else {
 503                 this.wrapper.find('.current-node-element').removeClass('current-node-element')
 504                 element._container().addClass('current-node-element');
 505                 this.publisher('currentElementChanged', element);
 506             }
 507         }.bind(this);
 508
 509
 510         var isTextElement = element instanceof documentElement.DocumentTextElement,
 511             nodeElementToLand = isTextElement ? element.parent() : element,
 512             textElementToLand = isTextElement ? element : findFirstDirectTextChild(element, nodeElementToLand),
 513             currentTextElement = this.getCurrentTextElement(),
 514             currentNodeElement = this.getCurrentNodeElement();
 515
 516         if(currentTextElement && !(currentTextElement.sameNode(textElementToLand)))
 517             this.wrapper.find('.current-text-element').removeClass('current-text-element');
 518
 519         if(textElementToLand) {
 520             _markAsCurrent(textElementToLand);
 521             if(params.caretTo || !textElementToLand.sameNode(this.getCursor().getPosition().element))
 522                 this._moveCaretToTextElement(textElementToLand, params.caretTo); // as method on element?
 523             if(!(textElementToLand.sameNode(currentTextElement)))
 524                 this.publisher('currentTextElementSet', textElementToLand);
 525         } else {
 526             document.getSelection().removeAllRanges();
 527         }
 528
 529         if(!(currentNodeElement && currentNodeElement.sameNode(nodeElementToLand))) {
 530             _markAsCurrent(nodeElementToLand);
 531
 532             this.publisher('currentNodeElementSet', nodeElementToLand);
 533         }
 534     },
 535
 536     _moveCaretToTextElement: function(element, where) {
 537         var range = document.createRange(),
 538             node = element.dom().contents()[0];
 539
 540         if(typeof where !== 'number') {
 541             range.selectNodeContents(node);
 542         } else {
 543             range.setStart(node, where);
 544         }
 545
 546         var collapseArg = true;
 547         if(where === 'end')
 548             collapseArg = false;
 549         range.collapse(collapseArg);
 550
 551         var selection = document.getSelection();
 552
 553         selection.removeAllRanges();
 554         selection.addRange(range);
 555         this.wrapper.focus(); // FF requires this for caret to be put where range colllapses, Chrome doesn't.
 556     },
 557
 558     setCursorPosition: function(position) {
 559         if(position.element)
 560             this._moveCaretToTextElement(position.element, position.offset);
 561     },
 562
 563     toXML: function() {
 564         var parent = $('<div>'),
 565             parts = this.doc().toXML(0);
 566         parent.append(parts);
 567         return parent.html();
 568     }
 569 });
 570
 571 $.extend(Canvas.prototype.list, {
 572     create: function(params) {
 573         if(!(params.element1.parent().sameNode(params.element2.parent())))
 574             return false;
 575
 576         var parent = params.element1.parent();
 577
 578         if(parent.childIndex(params.element1) > parent.childIndex(params.element2)) {
 579             var tmp = params.element1;
 580             params.element1 = params.element2;
 581             params.element2 = tmp;
 582         }
 583
 584         var elementsToWrap = [];
 585
 586         var place = 'before';
 587         var canvas = this;
 588         parent.children().some(function(element) {
 589             var _e = element;
 590             if(element.sameNode(params.element1))
 591                 place = 'inside';
 592             if(place === 'inside') {
 593                 if(element instanceof documentElement.DocumentTextElement) {
 594                     element = element.wrapWithNodeElement({tag: 'div', klass: 'list.item'});
 595                     if(element.children()[0].sameNode(params.element1))
 596                         params.element1 = element;
 597                 }
 598                 element.setWlxmlClass('item');
 599                 elementsToWrap.push(element);
 600             }
 601             if(_e.sameNode(params.element2))
 602                 return true;
 603         });
 604
 605         var listElement = documentElement.DocumentNodeElement.create({tag: 'div', klass: 'list-items' + (params.type === 'enum' ? '-enum' : '')});
 606
 607         var toret;
 608         if(parent.is('list')) {
 609             var item = listElement.wrapWithNodeElement({tag: 'div', klass: 'item'});
 610             item.exec('toggleBullet', false);
 611             toret = listElement.parent();
 612         } else {
 613             toret = listElement;
 614         }
 615
 616         params.element1.before(toret);
 617
 618         elementsToWrap.forEach(function(element) {
 619             element.detach();
 620             listElement.append(element);
 621         });
 622     },
 623     extractItems: function(params) {
 624         params = _.extend({merge: true}, params);
 625         var list = params.element1.parent();
 626         if(!list.is('list') || !(list.sameNode(params.element2.parent())))
 627             return false;
 628
 629         var idx1 = list.childIndex(params.element1),
 630             idx2 = list.childIndex(params.element2),
 631             precedingItems = [],
 632             extractedItems = [],
 633             succeedingItems = [],
 634             items = list.children(),
 635             listIsNested = list.parent().getWlxmlClass() === 'item',
 636             i;
 637
 638         if(idx1 > idx2) {
 639             var tmp = idx1; idx1 = idx2; idx2 = tmp;
 640         }
 641
 642         items.forEach(function(item, idx) {
 643             if(idx < idx1)
 644                 precedingItems.push(item);
 645             else if(idx >= idx1 && idx <= idx2) {
 646                 extractedItems.push(item);
 647             }
 648             else {
 649                 succeedingItems.push(item);
 650             }
 651         });
 652
 653         var reference = listIsNested ? list.parent() : list;
 654         if(succeedingItems.length === 0) {
 655             var reference_orig = reference;
 656             extractedItems.forEach(function(item) {
 657                 reference.after(item);
 658                 reference = item;
 659                 if(!listIsNested)
 660                     item.setWlxmlClass(null);
 661             });
 662             if(precedingItems.length === 0)
 663                 reference_orig.detach();
 664         } else if(precedingItems.length === 0) {
 665             extractedItems.forEach(function(item) {
 666                 reference.before(item);
 667                 if(!listIsNested)
 668                     item.setWlxmlClass(null);
 669             });
 670         } else {
 671             extractedItems.forEach(function(item) {
 672                 reference.after(item);
 673                 if(!listIsNested)
 674                     item.setWlxmlClass(null);
 675                 reference = item;
 676             });
 677             var secondList = documentElement.DocumentNodeElement.create({tag: 'div', klass:'list-items'}, this),
 678                 toAdd = secondList;
 679
 680             if(listIsNested) {
 681                 toAdd = secondList.wrapWithNodeElement({tag: 'div', klass:'item'});
 682             }
 683             succeedingItems.forEach(function(item) {
 684                 secondList.append(item);
 685             });
 686
 687             reference.after(toAdd);
 688         }
 689         if(!params.merge && listIsNested) {
 690             return this.extractItems({element1: extractedItems[0], element2: extractedItems[extractedItems.length-1]});
 691         }
 692         return true;
 693     },
 694     areItemsOfTheSameList: function(params) {
 695         var e1 = params.element1,
 696             e2 = params.element2;
 697         return e1.parent().sameNode(e2.parent())
 698             && e1.parent().is('list');
 699     }
 700 });
 701
 702
 703 var Cursor = function(canvas) {
 704     this.canvas = canvas;
 705 };
 706
 707 $.extend(Cursor.prototype, {
 708     isSelecting: function() {
 709         var selection = window.getSelection();
 710         return !selection.isCollapsed;
 711     },
 712     isSelectingWithinElement: function() {
 713         return this.isSelecting() && this.getSelectionStart().element.sameNode(this.getSelectionEnd().element);
 714     },
 715     isSelectingSiblings: function() {
 716         return this.isSelecting() && this.getSelectionStart().element.parent().sameNode(this.getSelectionEnd().element.parent());
 717     },
 718     getPosition: function() {
 719         return this.getSelectionAnchor();
 720     },
 721     getSelectionStart: function() {
 722         return this.getSelectionBoundry('start');
 723     },
 724     getSelectionEnd: function() {
 725         return this.getSelectionBoundry('end');
 726     },
 727     getSelectionAnchor: function() {
 728         return this.getSelectionBoundry('anchor');
 729     },
 730     getSelectionFocus: function() {
 731         return this.getSelectionBoundry('focus');
 732     },
 733     getSelectionBoundry: function(which) {
 734         var selection = window.getSelection(),
 735             anchorElement = this.canvas.getDocumentElement(selection.anchorNode),
 736             focusElement = this.canvas.getDocumentElement(selection.focusNode);
 737
 738         var getOffset = function(where) {
 739             var toret, node;
 740             if(where === 'anchor') {
 741                 node = selection.anchorNode;
 742                 toret = selection.anchorOffset;
 743             } else {
 744                 node = selection.focusNode;
 745                 toret = selection.focusOffset;
 746             }
 747
 748             if(toret === 1 && node.data.charAt(0) === utils.unicode.ZWS)
 749                 toret = 0;
 750             else if((toret === node.data.length - 1) && (node.data.charAt(node.data.length - 1) === utils.unicode.ZWS))
 751                 toret++;
 752             return toret;
 753         }
 754
 755         if((!anchorElement) || (anchorElement instanceof documentElement.DocumentNodeElement) || (!focusElement) || focusElement instanceof documentElement.DocumentNodeElement)
 756             return {};
 757
 758         if(which === 'anchor') {
 759             return {
 760                 element: anchorElement,
 761                 offset: getOffset('anchor'),
 762                 offsetAtBeginning: getOffset('anchor') === 0,
 763                 offsetAtEnd: selection.anchorNode.data.length === getOffset('anchor')
 764             };
 765         }
 766         if(which === 'focus') {
 767             return {
 768                 element: focusElement,
 769                 offset: getOffset('focus'),
 770                 offsetAtBeginning: getOffset('focus') === 0,
 771                 offsetAtEnd: selection.focusNode.data.length === getOffset('focus')
 772             };
 773         }
 774
 775         var element,
 776             offset;
 777
 778         if(anchorElement.parent().sameNode(focusElement.parent())) {
 779             var parent = anchorElement.parent(),
 780                 anchorFirst = parent.childIndex(anchorElement) < parent.childIndex(focusElement);
 781             if(anchorFirst) {
 782                 if(which === 'start') {
 783                     element = anchorElement;
 784                     offset = getOffset('anchor')
 785                 }
 786                 else if(which === 'end') {
 787                     element = focusElement,
 788                     offset = getOffset('focus')
 789                 }
 790             } else {
 791                 if(which === 'start') {
 792                     element = focusElement,
 793                     offset = getOffset('focus')
 794                 }
 795                 else if(which === 'end') {
 796                     element = anchorElement;
 797                     offset = getOffset('anchor')
 798                 }
 799             }
 800         } else {
 801             // TODO: Handle order via https://developer.mozilla.org/en-US/docs/Web/API/Node.compareDocumentPosition
 802             if(which === 'start') {
 803                 element = anchorElement;
 804                 offset = getOffset('anchor')
 805             } else {
 806                 element = focusElement;
 807                 offset = getOffset('focus')
 808             }
 809         }
 810
 811         var nodeLen = (element.sameNode(focusElement) ? selection.focusNode : selection.anchorNode).length;
 812         return {
 813             element: element,
 814             offset: offset,
 815             offsetAtBeginning: offset === 0,
 816             offsetAtEnd: nodeLen === offset
 817         }
 818     }
 819 })
 820
 821 return {
 822     fromXML: function(xml, publisher) {
 823         return new Canvas(xml, publisher);
 824     }
 825 };
 826
 827 });