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