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