modules/documentCanvas/canvas/canvas.js

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