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