modules/documentCanvas/canvas/canvas.js

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