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
 289                             if(position.offsetAtBeginning)
 290                                 newEmpty = elements.first;
 291                             else if(position.offsetAtEnd)
 292                                 newEmpty = elements.second;
 293                             if(newEmpty) {
 294                                 goto = newEmpty.append(documentElement.DocumentTextElement.create({text: ''}, this));
 295                                 canvas.setCurrentElement(goto);
 296                             }
 297                         }
 298                     }
 299                 }
 300             });
 301
 302             this.wrapper.on('click', '[document-node-element], [document-text-element]', function(e) {
 303                 e.stopPropagation();
 304                 canvas.setCurrentElement(canvas.getDocumentElement(e.currentTarget), {caretTo: false});
 305             });
 306
 307             var observer = new MutationObserver(function(mutations) {
 308                 mutations.forEach(function(mutation) {
 309                     if(documentElement.DocumentTextElement.isContentContainer(mutation.target) && mutation.target.data === '')
 310                         mutation.target.data = utils.unicode.ZWS;
 311                 });
 312             });
 313             var config = { attributes: false, childList: false, characterData: true, subtree: true, characterDataOldValue: true};
 314             observer.observe(this.d[0], config);
 315
 316
 317             this.wrapper.on('mouseover', '[document-node-element], [document-text-element]', function(e) {
 318                 var el = canvas.getDocumentElement(e.currentTarget);
 319                 if(!el)
 320                     return;
 321                 e.stopPropagation();
 322                 if(el instanceof documentElement.DocumentTextElement)
 323                     el = el.parent();
 324                 el.toggleLabel(true);
 325             });
 326             this.wrapper.on('mouseout', '[document-node-element], [document-text-element]', function(e) {
 327                 var el = canvas.getDocumentElement(e.currentTarget);
 328                 if(!el)
 329                     return;
 330                 e.stopPropagation();
 331                 if(el instanceof documentElement.DocumentTextElement)
 332                     el = el.parent();
 333                 el.toggleLabel(false);
 334             });
 335
 336             this.eventBus.on('elementToggled', function(toggle, element) {
 337                 if(!toggle) {
 338                     element = canvas.getDocumentElement(utils.nearestInDocumentOrder('[document-text-element]:visible', 'above', element.dom()[0]));
 339                     canvas.setCurrentElement(element);
 340                 }
 341             })
 342
 343         } else {
 344             this.d = null;
 345         }
 346     },
 347
 348     view: function() {
 349         return this.wrapper;
 350     },
 351
 352     doc: function() {
 353         if(this.d === null)
 354             return null;
 355         return documentElement.DocumentNodeElement.fromHTMLElement(this.d.get(0), this); //{wlxmlTag: this.d.prop('tagName')};
 356     },
 357
 358     wrapText: function(params) {
 359         params = _.extend({textNodeIdx: 0}, params);
 360         if(typeof params.textNodeIdx === 'number')
 361             params.textNodeIdx = [params.textNodeIdx];
 362
 363         var childrenInside = params.inside.children(),
 364             idx1 = Math.min.apply(Math, params.textNodeIdx),
 365             idx2 = Math.max.apply(Math, params.textNodeIdx),
 366             textNode1 = childrenInside[idx1],
 367             textNode2 = childrenInside[idx2],
 368             sameNode = textNode1.sameNode(textNode2),
 369             prefixOutside = textNode1.getText().substr(0, params.offsetStart),
 370             prefixInside = textNode1.getText().substr(params.offsetStart),
 371             suffixInside = textNode2.getText().substr(0, params.offsetEnd),
 372             suffixOutside = textNode2.getText().substr(params.offsetEnd)
 373         ;
 374
 375         var wrapperElement = documentElement.DocumentNodeElement.create({tag: params._with.tag, klass: params._with.klass});
 376         textNode1.after(wrapperElement);
 377         textNode1.detach();
 378
 379         if(prefixOutside.length > 0)
 380             wrapperElement.before({text:prefixOutside});
 381         if(sameNode) {
 382             var core = textNode1.getText().substr(params.offsetStart, params.offsetEnd - params.offsetStart);
 383             wrapperElement.append({text: core});
 384         } else {
 385             textNode2.detach();
 386             if(prefixInside.length > 0)
 387                 wrapperElement.append({text: prefixInside});
 388             for(var i = idx1 + 1; i < idx2; i++) {
 389                 wrapperElement.append(childrenInside[i]);
 390             }
 391             if(suffixInside.length > 0)
 392                 wrapperElement.append({text: suffixInside});
 393         }
 394         if(suffixOutside.length > 0)
 395             wrapperElement.after({text: suffixOutside});
 396         return wrapperElement;
 397     },
 398
 399     wrapElements: function(params) {
 400         if(!(params.element1.parent().sameNode(params.element2.parent())))
 401             return;
 402
 403         var parent = params.element1.parent(),
 404             parentChildren = parent.children(),
 405             wrapper = documentElement.DocumentNodeElement.create({
 406                 tag: params._with.tag,
 407                 klass: params._with.klass}),
 408             idx1 = parent.childIndex(params.element1),
 409             idx2 = parent.childIndex(params.element2);
 410
 411         if(idx1 > idx2) {
 412             var tmp = idx1;
 413             idx1 = idx2;
 414             idx2 = tmp;
 415         }
 416
 417         var insertingMethod, insertingTarget;
 418         if(idx1 === 0) {
 419             insertingMethod = 'prepend';
 420             insertingTarget = parent;
 421         } else {
 422             insertingMethod = 'after';
 423             insertingTarget = parentChildren[idx1-1];
 424         }
 425
 426         for(var i = idx1; i <= idx2; i++) {
 427             wrapper.append(parentChildren[i].detach());
 428         }
 429
 430         insertingTarget[insertingMethod](wrapper);
 431         return wrapper;
 432     },
 433
 434     getSiblingParents: function(params) {
 435         var parents1 = [params.element1].concat(params.element1.parents()).reverse(),
 436             parents2 = [params.element2].concat(params.element2.parents()).reverse(),
 437             noSiblingParents = null;
 438
 439         if(parents1.length === 0 || parents2.length === 0 || !(parents1[0].sameNode(parents2[0])))
 440             return noSiblingParents;
 441
 442         var i;
 443         for(i = 0; i < Math.min(parents1.length, parents2.length); i++) {
 444             if(parents1[i].sameNode(parents2[i]))
 445                 continue;
 446             break;
 447         }
 448         return {element1: parents1[i], element2: parents2[i]};
 449     },
 450
 451     getDocumentElement: function(from) {
 452         if(from instanceof HTMLElement || from instanceof Text) {
 453            return documentElement.DocumentElement.fromHTMLElement(from, this);
 454         }
 455     },
 456     getCursor: function() {
 457         return new Cursor(this);
 458     },
 459
 460     list: {},
 461
 462
 463     getCurrentNodeElement: function() {
 464         return this.getDocumentElement(this.wrapper.find('.current-node-element').parent()[0]);
 465     },
 466
 467     getCurrentTextElement: function() {
 468         return this.getDocumentElement(this.wrapper.find('.current-text-element')[0]);
 469     },
 470
 471
 472
 473     setCurrentElement: function(element, params) {
 474         params = _.extend({caretTo: 'end'}, params);
 475         var findFirstDirectTextChild = function(e, nodeToLand) {
 476             var byBrowser = this.getCursor().getPosition().element;
 477             if(byBrowser && byBrowser.parent().sameNode(nodeToLand))
 478                 return byBrowser;
 479             var children = e.children();
 480             for(var i = 0; i < children.length; i++) {
 481                 if(children[i] instanceof documentElement.DocumentTextElement)
 482                     return children[i];
 483             }
 484             return null;
 485         }.bind(this);
 486         var _markAsCurrent = function(element) {
 487             if(element instanceof documentElement.DocumentTextElement) {
 488                 this.wrapper.find('.current-text-element').removeClass('current-text-element');
 489                 element.dom().addClass('current-text-element');
 490             } else {
 491                 this.wrapper.find('.current-node-element').removeClass('current-node-element')
 492                 element._container().addClass('current-node-element');
 493                 this.publisher('currentElementChanged', element);
 494             }
 495         }.bind(this);
 496
 497
 498         var isTextElement = element instanceof documentElement.DocumentTextElement,
 499             nodeElementToLand = isTextElement ? element.parent() : element,
 500             textElementToLand = isTextElement ? element : findFirstDirectTextChild(element, nodeElementToLand),
 501             currentTextElement = this.getCurrentTextElement(),
 502             currentNodeElement = this.getCurrentNodeElement();
 503
 504         if(currentTextElement && !(currentTextElement.sameNode(textElementToLand)))
 505             this.wrapper.find('.current-text-element').removeClass('current-text-element');
 506
 507         if(textElementToLand) {
 508             _markAsCurrent(textElementToLand);
 509             if(params.caretTo || !textElementToLand.sameNode(this.getCursor().getPosition().element))
 510                 this._moveCaretToTextElement(textElementToLand, params.caretTo); // as method on element?
 511             if(!(textElementToLand.sameNode(currentTextElement)))
 512                 this.publisher('currentTextElementSet', textElementToLand);
 513         } else {
 514             document.getSelection().removeAllRanges();
 515         }
 516
 517         if(!(currentNodeElement && currentNodeElement.sameNode(nodeElementToLand))) {
 518             _markAsCurrent(nodeElementToLand);
 519
 520             this.publisher('currentNodeElementSet', nodeElementToLand);
 521         }
 522     },
 523
 524     _moveCaretToTextElement: function(element, where) {
 525         var range = document.createRange(),
 526             node = element.dom().contents()[0];
 527
 528         if(typeof where !== 'number') {
 529             range.selectNodeContents(node);
 530         } else {
 531             range.setStart(node, where);
 532         }
 533
 534         var collapseArg = true;
 535         if(where === 'end')
 536             collapseArg = false;
 537         range.collapse(collapseArg);
 538
 539         var selection = document.getSelection();
 540
 541         selection.removeAllRanges();
 542         selection.addRange(range);
 543         this.wrapper.focus(); // FF requires this for caret to be put where range colllapses, Chrome doesn't.
 544     },
 545
 546     setCursorPosition: function(position) {
 547         if(position.element)
 548             this._moveCaretToTextElement(position.element, position.offset);
 549     },
 550
 551     toXML: function() {
 552         var parent = $('<div>'),
 553             parts = this.doc().toXML(0);
 554         parent.append(parts);
 555         return parent.html();
 556     }
 557 });
 558
 559 $.extend(Canvas.prototype.list, {
 560     create: function(params) {
 561         if(!(params.element1.parent().sameNode(params.element2.parent())))
 562             return false;
 563
 564         var parent = params.element1.parent();
 565
 566         if(parent.childIndex(params.element1) > parent.childIndex(params.element2)) {
 567             var tmp = params.element1;
 568             params.element1 = params.element2;
 569             params.element2 = tmp;
 570         }
 571
 572         var elementsToWrap = [];
 573
 574         var place = 'before';
 575         var canvas = this;
 576         parent.children().some(function(element) {
 577             var _e = element;
 578             if(element.sameNode(params.element1))
 579                 place = 'inside';
 580             if(place === 'inside') {
 581                 if(element instanceof documentElement.DocumentTextElement) {
 582                     element = element.wrapWithNodeElement({tag: 'div', klass: 'list.item'});
 583                     if(element.children()[0].sameNode(params.element1))
 584                         params.element1 = element;
 585                 }
 586                 element.setWlxmlClass('item');
 587                 elementsToWrap.push(element);
 588             }
 589             if(_e.sameNode(params.element2))
 590                 return true;
 591         });
 592
 593         var listElement = documentElement.DocumentNodeElement.create({tag: 'div', klass: 'list-items' + (params.type === 'enum' ? '-enum' : '')});
 594
 595         var toret;
 596         if(parent.is('list')) {
 597             listElement.wrapWithNodeElement({tag: 'div', klass: 'item'});
 598             toret = listElement.parent();
 599         } else {
 600             toret = listElement;
 601         }
 602
 603         params.element1.before(toret);
 604
 605         elementsToWrap.forEach(function(element) {
 606             element.detach();
 607             listElement.append(element);
 608         });
 609     },
 610     extractItems: function(params) {
 611         params = _.extend({merge: true}, params);
 612         var list = params.element1.parent();
 613         if(!list.is('list') || !(list.sameNode(params.element2.parent())))
 614             return false;
 615
 616         var idx1 = list.childIndex(params.element1),
 617             idx2 = list.childIndex(params.element2),
 618             precedingItems = [],
 619             extractedItems = [],
 620             succeedingItems = [],
 621             items = list.children(),
 622             listIsNested = list.parent().getWlxmlClass() === 'item',
 623             i;
 624
 625         if(idx1 > idx2) {
 626             var tmp = idx1; idx1 = idx2; idx2 = tmp;
 627         }
 628
 629         items.forEach(function(item, idx) {
 630             if(idx < idx1)
 631                 precedingItems.push(item);
 632             else if(idx >= idx1 && idx <= idx2) {
 633                 extractedItems.push(item);
 634             }
 635             else {
 636                 succeedingItems.push(item);
 637             }
 638         });
 639
 640         var reference = listIsNested ? list.parent() : list;
 641         if(succeedingItems.length === 0) {
 642             var reference_orig = reference;
 643             extractedItems.forEach(function(item) {
 644                 reference.after(item);
 645                 reference = item;
 646                 if(!listIsNested)
 647                     item.setWlxmlClass(null);
 648             });
 649             if(precedingItems.length === 0)
 650                 reference_orig.detach();
 651         } else if(precedingItems.length === 0) {
 652             extractedItems.forEach(function(item) {
 653                 reference.before(item);
 654                 if(!listIsNested)
 655                     item.setWlxmlClass(null);
 656             });
 657         } else {
 658             extractedItems.forEach(function(item) {
 659                 reference.after(item);
 660                 if(!listIsNested)
 661                     item.setWlxmlClass(null);
 662                 reference = item;
 663             });
 664             var secondList = documentElement.DocumentNodeElement.create({tag: 'div', klass:'list-items'}, this),
 665                 toAdd = secondList;
 666
 667             if(listIsNested) {
 668                 toAdd = secondList.wrapWithNodeElement({tag: 'div', klass:'item'});
 669             }
 670             succeedingItems.forEach(function(item) {
 671                 secondList.append(item);
 672             });
 673
 674             reference.after(toAdd);
 675         }
 676         if(!params.merge && listIsNested) {
 677             return this.extractItems({element1: extractedItems[0], element2: extractedItems[extractedItems.length-1]});
 678         }
 679         return true;
 680     },
 681     areItemsOfTheSameList: function(params) {
 682         var e1 = params.element1,
 683             e2 = params.element2;
 684         return e1.parent().sameNode(e2.parent())
 685             && e1.parent().is('list');
 686     }
 687 });
 688
 689
 690 var Cursor = function(canvas) {
 691     this.canvas = canvas;
 692 };
 693
 694 $.extend(Cursor.prototype, {
 695     isSelecting: function() {
 696         var selection = window.getSelection();
 697         return !selection.isCollapsed;
 698     },
 699     isSelectingWithinElement: function() {
 700         return this.isSelecting() && this.getSelectionStart().element.sameNode(this.getSelectionEnd().element);
 701     },
 702     isSelectingSiblings: function() {
 703         return this.isSelecting() && this.getSelectionStart().element.parent().sameNode(this.getSelectionEnd().element.parent());
 704     },
 705     getPosition: function() {
 706         return this.getSelectionAnchor();
 707     },
 708     getSelectionStart: function() {
 709         return this.getSelectionBoundry('start');
 710     },
 711     getSelectionEnd: function() {
 712         return this.getSelectionBoundry('end');
 713     },
 714     getSelectionAnchor: function() {
 715         return this.getSelectionBoundry('anchor');
 716     },
 717     getSelectionFocus: function() {
 718         return this.getSelectionBoundry('focus');
 719     },
 720     getSelectionBoundry: function(which) {
 721         var selection = window.getSelection(),
 722             anchorElement = this.canvas.getDocumentElement(selection.anchorNode),
 723             focusElement = this.canvas.getDocumentElement(selection.focusNode);
 724
 725         var getOffset = function(where) {
 726             var toret, node;
 727             if(where === 'anchor') {
 728                 node = selection.anchorNode;
 729                 toret = selection.anchorOffset;
 730             } else {
 731                 node = selection.focusNode;
 732                 toret = selection.focusOffset;
 733             }
 734
 735             if(toret === 1 && node.data.charAt(0) === utils.unicode.ZWS)
 736                 toret = 0;
 737             else if((toret === node.data.length - 1) && (node.data.charAt(node.data.length - 1) === utils.unicode.ZWS))
 738                 toret++;
 739             return toret;
 740         }
 741
 742         if((!anchorElement) || (anchorElement instanceof documentElement.DocumentNodeElement) || (!focusElement) || focusElement instanceof documentElement.DocumentNodeElement)
 743             return {};
 744
 745         if(which === 'anchor') {
 746             return {
 747                 element: anchorElement,
 748                 offset: getOffset('anchor'),
 749                 offsetAtBeginning: getOffset('anchor') === 0,
 750                 offsetAtEnd: selection.anchorNode.data.length === getOffset('anchor')
 751             };
 752         }
 753         if(which === 'focus') {
 754             return {
 755                 element: focusElement,
 756                 offset: getOffset('focus'),
 757                 offsetAtBeginning: getOffset('focus') === 0,
 758                 offsetAtEnd: selection.focusNode.data.length === getOffset('focus')
 759             };
 760         }
 761
 762         var element,
 763             offset;
 764
 765         if(anchorElement.parent().sameNode(focusElement.parent())) {
 766             var parent = anchorElement.parent(),
 767                 anchorFirst = parent.childIndex(anchorElement) < parent.childIndex(focusElement);
 768             if(anchorFirst) {
 769                 if(which === 'start') {
 770                     element = anchorElement;
 771                     offset = getOffset('anchor')
 772                 }
 773                 else if(which === 'end') {
 774                     element = focusElement,
 775                     offset = getOffset('focus')
 776                 }
 777             } else {
 778                 if(which === 'start') {
 779                     element = focusElement,
 780                     offset = getOffset('focus')
 781                 }
 782                 else if(which === 'end') {
 783                     element = anchorElement;
 784                     offset = getOffset('anchor')
 785                 }
 786             }
 787         } else {
 788             // TODO: Handle order via https://developer.mozilla.org/en-US/docs/Web/API/Node.compareDocumentPosition
 789             if(which === 'start') {
 790                 element = anchorElement;
 791                 offset = getOffset('anchor')
 792             } else {
 793                 element = focusElement;
 794                 offset = getOffset('focus')
 795             }
 796         }
 797
 798         var nodeLen = (element.sameNode(focusElement) ? selection.focusNode : selection.anchorNode).length;
 799         return {
 800             element: element,
 801             offset: offset,
 802             offsetAtBeginning: offset === 0,
 803             offsetAtEnd: nodeLen === offset
 804         }
 805     }
 806 })
 807
 808 return {
 809     fromXML: function(xml, publisher) {
 810         return new Canvas(xml, publisher);
 811     }
 812 };
 813
 814 });