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, window.getSelection().focusNode))
 192                             canvas.setCurrentElement(element, {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                         if(mutation.target.data === '')
 324                             mutation.target.data = utils.unicode.ZWS;
 325                         canvas.publisher('contentChanged');
 326                     }
 327                 });
 328             });
 329             var config = { attributes: false, childList: false, characterData: true, subtree: true, characterDataOldValue: true};
 330             observer.observe(this.d[0], config);
 331
 332
 333             this.wrapper.on('mouseover', '[document-node-element], [document-text-element]', function(e) {
 334                 var el = canvas.getDocumentElement(e.currentTarget);
 335                 if(!el)
 336                     return;
 337                 e.stopPropagation();
 338                 if(el instanceof documentElement.DocumentTextElement)
 339                     el = el.parent();
 340                 el.toggleLabel(true);
 341             });
 342             this.wrapper.on('mouseout', '[document-node-element], [document-text-element]', function(e) {
 343                 var el = canvas.getDocumentElement(e.currentTarget);
 344                 if(!el)
 345                     return;
 346                 e.stopPropagation();
 347                 if(el instanceof documentElement.DocumentTextElement)
 348                     el = el.parent();
 349                 el.toggleLabel(false);
 350             });
 351
 352             this.eventBus.on('elementToggled', function(toggle, element) {
 353                 if(!toggle) {
 354                     element = canvas.getDocumentElement(utils.nearestInDocumentOrder('[document-text-element]:visible', 'above', element.dom()[0]));
 355                     canvas.setCurrentElement(element);
 356                 }
 357             })
 358
 359         } else {
 360             this.d = null;
 361         }
 362     },
 363
 364     view: function() {
 365         return this.wrapper;
 366     },
 367
 368     doc: function() {
 369         if(this.d === null)
 370             return null;
 371         return documentElement.DocumentNodeElement.fromHTMLElement(this.d.get(0), this); //{wlxmlTag: this.d.prop('tagName')};
 372     },
 373
 374     wrapText: function(params) {
 375         params = _.extend({textNodeIdx: 0}, params);
 376         if(typeof params.textNodeIdx === 'number')
 377             params.textNodeIdx = [params.textNodeIdx];
 378
 379         var childrenInside = params.inside.children(),
 380             idx1 = Math.min.apply(Math, params.textNodeIdx),
 381             idx2 = Math.max.apply(Math, params.textNodeIdx),
 382             textNode1 = childrenInside[idx1],
 383             textNode2 = childrenInside[idx2],
 384             sameNode = textNode1.sameNode(textNode2),
 385             prefixOutside = textNode1.getText().substr(0, params.offsetStart),
 386             prefixInside = textNode1.getText().substr(params.offsetStart),
 387             suffixInside = textNode2.getText().substr(0, params.offsetEnd),
 388             suffixOutside = textNode2.getText().substr(params.offsetEnd)
 389         ;
 390
 391         var wrapperElement = documentElement.DocumentNodeElement.create({tag: params._with.tag, klass: params._with.klass});
 392         textNode1.after(wrapperElement);
 393         textNode1.detach();
 394
 395         if(prefixOutside.length > 0)
 396             wrapperElement.before({text:prefixOutside});
 397         if(sameNode) {
 398             var core = textNode1.getText().substr(params.offsetStart, params.offsetEnd - params.offsetStart);
 399             wrapperElement.append({text: core});
 400         } else {
 401             textNode2.detach();
 402             if(prefixInside.length > 0)
 403                 wrapperElement.append({text: prefixInside});
 404             for(var i = idx1 + 1; i < idx2; i++) {
 405                 wrapperElement.append(childrenInside[i]);
 406             }
 407             if(suffixInside.length > 0)
 408                 wrapperElement.append({text: suffixInside});
 409         }
 410         if(suffixOutside.length > 0)
 411             wrapperElement.after({text: suffixOutside});
 412         return wrapperElement;
 413     },
 414
 415     wrapElements: function(params) {
 416         if(!(params.element1.parent().sameNode(params.element2.parent())))
 417             return;
 418
 419         var parent = params.element1.parent(),
 420             parentChildren = parent.children(),
 421             wrapper = documentElement.DocumentNodeElement.create({
 422                 tag: params._with.tag,
 423                 klass: params._with.klass}),
 424             idx1 = parent.childIndex(params.element1),
 425             idx2 = parent.childIndex(params.element2);
 426
 427         if(idx1 > idx2) {
 428             var tmp = idx1;
 429             idx1 = idx2;
 430             idx2 = tmp;
 431         }
 432
 433         var insertingMethod, insertingTarget;
 434         if(idx1 === 0) {
 435             insertingMethod = 'prepend';
 436             insertingTarget = parent;
 437         } else {
 438             insertingMethod = 'after';
 439             insertingTarget = parentChildren[idx1-1];
 440         }
 441
 442         for(var i = idx1; i <= idx2; i++) {
 443             wrapper.append(parentChildren[i].detach());
 444         }
 445
 446         insertingTarget[insertingMethod](wrapper);
 447         return wrapper;
 448     },
 449
 450     getSiblingParents: function(params) {
 451         var parents1 = [params.element1].concat(params.element1.parents()).reverse(),
 452             parents2 = [params.element2].concat(params.element2.parents()).reverse(),
 453             noSiblingParents = null;
 454
 455         if(parents1.length === 0 || parents2.length === 0 || !(parents1[0].sameNode(parents2[0])))
 456             return noSiblingParents;
 457
 458         var i;
 459         for(i = 0; i < Math.min(parents1.length, parents2.length); i++) {
 460             if(parents1[i].sameNode(parents2[i]))
 461                 continue;
 462             break;
 463         }
 464         return {element1: parents1[i], element2: parents2[i]};
 465     },
 466
 467     getDocumentElement: function(from) {
 468         if(from instanceof HTMLElement || from instanceof Text) {
 469            return documentElement.DocumentElement.fromHTMLElement(from, this);
 470         }
 471     },
 472     getCursor: function() {
 473         return new Cursor(this);
 474     },
 475
 476     list: {},
 477
 478
 479     getCurrentNodeElement: function() {
 480         return this.getDocumentElement(this.wrapper.find('.current-node-element').parent()[0]);
 481     },
 482
 483     getCurrentTextElement: function() {
 484         return this.getDocumentElement(this.wrapper.find('.current-text-element')[0]);
 485     },
 486
 487
 488
 489     setCurrentElement: function(element, params) {
 490         params = _.extend({caretTo: 'end'}, params);
 491         var findFirstDirectTextChild = function(e, nodeToLand) {
 492             var byBrowser = this.getCursor().getPosition().element;
 493             if(byBrowser && byBrowser.parent().sameNode(nodeToLand))
 494                 return byBrowser;
 495             var children = e.children();
 496             for(var i = 0; i < children.length; i++) {
 497                 if(children[i] instanceof documentElement.DocumentTextElement)
 498                     return children[i];
 499             }
 500             return null;
 501         }.bind(this);
 502         var _markAsCurrent = function(element) {
 503             if(element instanceof documentElement.DocumentTextElement) {
 504                 this.wrapper.find('.current-text-element').removeClass('current-text-element');
 505                 element.dom().addClass('current-text-element');
 506             } else {
 507                 this.wrapper.find('.current-node-element').removeClass('current-node-element')
 508                 element._container().addClass('current-node-element');
 509                 this.publisher('currentElementChanged', element);
 510             }
 511         }.bind(this);
 512
 513
 514         var isTextElement = element instanceof documentElement.DocumentTextElement,
 515             nodeElementToLand = isTextElement ? element.parent() : element,
 516             textElementToLand = isTextElement ? element : findFirstDirectTextChild(element, nodeElementToLand),
 517             currentTextElement = this.getCurrentTextElement(),
 518             currentNodeElement = this.getCurrentNodeElement();
 519
 520         if(currentTextElement && !(currentTextElement.sameNode(textElementToLand)))
 521             this.wrapper.find('.current-text-element').removeClass('current-text-element');
 522
 523         if(textElementToLand) {
 524             _markAsCurrent(textElementToLand);
 525             if(params.caretTo || !textElementToLand.sameNode(this.getCursor().getPosition().element))
 526                 this._moveCaretToTextElement(textElementToLand, params.caretTo); // as method on element?
 527             if(!(textElementToLand.sameNode(currentTextElement)))
 528                 this.publisher('currentTextElementSet', textElementToLand);
 529         } else {
 530             document.getSelection().removeAllRanges();
 531         }
 532
 533         if(!(currentNodeElement && currentNodeElement.sameNode(nodeElementToLand))) {
 534             _markAsCurrent(nodeElementToLand);
 535
 536             this.publisher('currentNodeElementSet', nodeElementToLand);
 537         }
 538     },
 539
 540     _moveCaretToTextElement: function(element, where) {
 541         var range = document.createRange(),
 542             node = element.dom().contents()[0];
 543
 544         if(typeof where !== 'number') {
 545             range.selectNodeContents(node);
 546         } else {
 547             range.setStart(node, where);
 548         }
 549
 550         var collapseArg = true;
 551         if(where === 'end')
 552             collapseArg = false;
 553         range.collapse(collapseArg);
 554
 555         var selection = document.getSelection();
 556
 557         selection.removeAllRanges();
 558         selection.addRange(range);
 559         this.wrapper.focus(); // FF requires this for caret to be put where range colllapses, Chrome doesn't.
 560     },
 561
 562     setCursorPosition: function(position) {
 563         if(position.element)
 564             this._moveCaretToTextElement(position.element, position.offset);
 565     },
 566
 567     toXML: function() {
 568         var parent = $('<div>'),
 569             parts = this.doc().toXML(0);
 570         parent.append(parts);
 571         return parent.html();
 572     }
 573 });
 574
 575 $.extend(Canvas.prototype.list, {
 576     create: function(params) {
 577         if(!(params.element1.parent().sameNode(params.element2.parent())))
 578             return false;
 579
 580         var parent = params.element1.parent();
 581
 582         if(parent.childIndex(params.element1) > parent.childIndex(params.element2)) {
 583             var tmp = params.element1;
 584             params.element1 = params.element2;
 585             params.element2 = tmp;
 586         }
 587
 588         var elementsToWrap = [];
 589
 590         var place = 'before';
 591         var canvas = this;
 592         parent.children().some(function(element) {
 593             var _e = element;
 594             if(element.sameNode(params.element1))
 595                 place = 'inside';
 596             if(place === 'inside') {
 597                 if(element instanceof documentElement.DocumentTextElement) {
 598                     element = element.wrapWithNodeElement({tag: 'div', klass: 'list.item'});
 599                     if(element.children()[0].sameNode(params.element1))
 600                         params.element1 = element;
 601                 }
 602                 element.setWlxmlClass('item');
 603                 elementsToWrap.push(element);
 604             }
 605             if(_e.sameNode(params.element2))
 606                 return true;
 607         });
 608
 609         var listElement = documentElement.DocumentNodeElement.create({tag: 'div', klass: 'list-items' + (params.type === 'enum' ? '-enum' : '')});
 610
 611         var toret;
 612         if(parent.is('list')) {
 613             var item = listElement.wrapWithNodeElement({tag: 'div', klass: 'item'});
 614             item.exec('toggleBullet', false);
 615             toret = listElement.parent();
 616         } else {
 617             toret = listElement;
 618         }
 619
 620         params.element1.before(toret);
 621
 622         elementsToWrap.forEach(function(element) {
 623             element.detach();
 624             listElement.append(element);
 625         });
 626     },
 627     extractItems: function(params) {
 628         params = _.extend({merge: true}, params);
 629         var list = params.element1.parent();
 630         if(!list.is('list') || !(list.sameNode(params.element2.parent())))
 631             return false;
 632
 633         var idx1 = list.childIndex(params.element1),
 634             idx2 = list.childIndex(params.element2),
 635             precedingItems = [],
 636             extractedItems = [],
 637             succeedingItems = [],
 638             items = list.children(),
 639             listIsNested = list.parent().getWlxmlClass() === 'item',
 640             i;
 641
 642         if(idx1 > idx2) {
 643             var tmp = idx1; idx1 = idx2; idx2 = tmp;
 644         }
 645
 646         items.forEach(function(item, idx) {
 647             if(idx < idx1)
 648                 precedingItems.push(item);
 649             else if(idx >= idx1 && idx <= idx2) {
 650                 extractedItems.push(item);
 651             }
 652             else {
 653                 succeedingItems.push(item);
 654             }
 655         });
 656
 657         var reference = listIsNested ? list.parent() : list;
 658         if(succeedingItems.length === 0) {
 659             var reference_orig = reference;
 660             extractedItems.forEach(function(item) {
 661                 reference.after(item);
 662                 reference = item;
 663                 if(!listIsNested)
 664                     item.setWlxmlClass(null);
 665             });
 666             if(precedingItems.length === 0)
 667                 reference_orig.detach();
 668         } else if(precedingItems.length === 0) {
 669             extractedItems.forEach(function(item) {
 670                 reference.before(item);
 671                 if(!listIsNested)
 672                     item.setWlxmlClass(null);
 673             });
 674         } else {
 675             extractedItems.forEach(function(item) {
 676                 reference.after(item);
 677                 if(!listIsNested)
 678                     item.setWlxmlClass(null);
 679                 reference = item;
 680             });
 681             var secondList = documentElement.DocumentNodeElement.create({tag: 'div', klass:'list-items'}, this),
 682                 toAdd = secondList;
 683
 684             if(listIsNested) {
 685                 toAdd = secondList.wrapWithNodeElement({tag: 'div', klass:'item'});
 686             }
 687             succeedingItems.forEach(function(item) {
 688                 secondList.append(item);
 689             });
 690
 691             reference.after(toAdd);
 692         }
 693         if(!params.merge && listIsNested) {
 694             return this.extractItems({element1: extractedItems[0], element2: extractedItems[extractedItems.length-1]});
 695         }
 696         return true;
 697     },
 698     areItemsOfTheSameList: function(params) {
 699         var e1 = params.element1,
 700             e2 = params.element2;
 701         return e1.parent().sameNode(e2.parent())
 702             && e1.parent().is('list');
 703     }
 704 });
 705
 706
 707 var Cursor = function(canvas) {
 708     this.canvas = canvas;
 709 };
 710
 711 $.extend(Cursor.prototype, {
 712     isSelecting: function() {
 713         var selection = window.getSelection();
 714         return !selection.isCollapsed;
 715     },
 716     isSelectingWithinElement: function() {
 717         return this.isSelecting() && this.getSelectionStart().element.sameNode(this.getSelectionEnd().element);
 718     },
 719     isSelectingSiblings: function() {
 720         return this.isSelecting() && this.getSelectionStart().element.parent().sameNode(this.getSelectionEnd().element.parent());
 721     },
 722     getPosition: function() {
 723         return this.getSelectionAnchor();
 724     },
 725     getSelectionStart: function() {
 726         return this.getSelectionBoundry('start');
 727     },
 728     getSelectionEnd: function() {
 729         return this.getSelectionBoundry('end');
 730     },
 731     getSelectionAnchor: function() {
 732         return this.getSelectionBoundry('anchor');
 733     },
 734     getSelectionFocus: function() {
 735         return this.getSelectionBoundry('focus');
 736     },
 737     getSelectionBoundry: function(which) {
 738         var selection = window.getSelection(),
 739             anchorElement = this.canvas.getDocumentElement(selection.anchorNode),
 740             focusElement = this.canvas.getDocumentElement(selection.focusNode);
 741
 742         var getOffset = function(where) {
 743             var toret, node;
 744             if(where === 'anchor') {
 745                 node = selection.anchorNode;
 746                 toret = selection.anchorOffset;
 747             } else {
 748                 node = selection.focusNode;
 749                 toret = selection.focusOffset;
 750             }
 751
 752             if(toret === 1 && node.data.charAt(0) === utils.unicode.ZWS)
 753                 toret = 0;
 754             else if((toret === node.data.length - 1) && (node.data.charAt(node.data.length - 1) === utils.unicode.ZWS))
 755                 toret++;
 756             return toret;
 757         }
 758
 759         if((!anchorElement) || (anchorElement instanceof documentElement.DocumentNodeElement) || (!focusElement) || focusElement instanceof documentElement.DocumentNodeElement)
 760             return {};
 761
 762         if(which === 'anchor') {
 763             return {
 764                 element: anchorElement,
 765                 offset: getOffset('anchor'),
 766                 offsetAtBeginning: getOffset('anchor') === 0,
 767                 offsetAtEnd: selection.anchorNode.data.length === getOffset('anchor')
 768             };
 769         }
 770         if(which === 'focus') {
 771             return {
 772                 element: focusElement,
 773                 offset: getOffset('focus'),
 774                 offsetAtBeginning: getOffset('focus') === 0,
 775                 offsetAtEnd: selection.focusNode.data.length === getOffset('focus')
 776             };
 777         }
 778
 779         var element,
 780             offset;
 781
 782         if(anchorElement.parent().sameNode(focusElement.parent())) {
 783             var parent = anchorElement.parent(),
 784                 anchorFirst = parent.childIndex(anchorElement) < parent.childIndex(focusElement);
 785             if(anchorFirst) {
 786                 if(which === 'start') {
 787                     element = anchorElement;
 788                     offset = getOffset('anchor')
 789                 }
 790                 else if(which === 'end') {
 791                     element = focusElement,
 792                     offset = getOffset('focus')
 793                 }
 794             } else {
 795                 if(which === 'start') {
 796                     element = focusElement,
 797                     offset = getOffset('focus')
 798                 }
 799                 else if(which === 'end') {
 800                     element = anchorElement;
 801                     offset = getOffset('anchor')
 802                 }
 803             }
 804         } else {
 805             // TODO: Handle order via https://developer.mozilla.org/en-US/docs/Web/API/Node.compareDocumentPosition
 806             if(which === 'start') {
 807                 element = anchorElement;
 808                 offset = getOffset('anchor')
 809             } else {
 810                 element = focusElement;
 811                 offset = getOffset('focus')
 812             }
 813         }
 814
 815         var nodeLen = (element.sameNode(focusElement) ? selection.focusNode : selection.anchorNode).length;
 816         return {
 817             element: element,
 818             offset: offset,
 819             offsetAtBeginning: offset === 0,
 820             offsetAtEnd: nodeLen === offset
 821         }
 822     }
 823 })
 824
 825 return {
 826     fromXML: function(xml, publisher) {
 827         return new Canvas(xml, publisher);
 828     }
 829 };
 830
 831 });