modules/documentCanvas/canvas/canvas.js

   1 define([
   2 'libs/jquery-1.9.1.min',
   3 'libs/underscore-min',
   4 'modules/documentCanvas/canvas/documentElement'
   5 ], function($, _, documentElement) {
   6
   7 'use strict';
   8
   9 var Canvas = function(wlxml, publisher) {
  10     this.loadWlxml(wlxml);
  11     this.publisher = publisher ? publisher : function() {};
  12 };
  13
  14 $.extend(Canvas.prototype, {
  15
  16     loadWlxml: function(wlxml) {
  17         var d = wlxml ? $($.trim(wlxml)) : null;
  18         if(d) {
  19             this.wrapper = $('<div>').addClass('canvas-wrapper').attr('contenteditable', true);
  20             this.wrapper.append(d);
  21
  22             this.wrapper.find('*').replaceWith(function() {
  23                 var currentTag = $(this);
  24                 if(currentTag.attr('wlxml-tag'))
  25                     return;
  26
  27                 var meta = {};
  28                 for(var i = 0; i < this.attributes.length; i++) {
  29                     var attr = this.attributes[i];
  30                     if(attr.name.substr(0, 5) === 'meta-')
  31                         meta[attr.name.substr(5)] = attr.value;
  32                 }
  33
  34                 var element = documentElement.DocumentNodeElement.create({
  35                     tag: currentTag.prop('tagName').toLowerCase(),
  36                     klass: currentTag.attr('class'),
  37                     meta: meta
  38                 });
  39
  40                 element.dom().append(currentTag.contents());
  41                 ['orig-before', 'orig-append'].forEach(function(attr) {
  42                     element.data(attr, '');
  43                 });
  44                 return element.dom();
  45             });
  46
  47             this.wrapper.find(':not(iframe)').addBack().contents()
  48                 .filter(function() {return this.nodeType === Node.TEXT_NODE})
  49                 .each(function() {
  50
  51                     var el = $(this);
  52
  53                     // TODO: use DocumentElement API
  54                     var spanParent = el.parent().attr('wlxml-tag') === 'span',
  55                         spanBefore = el.prev().length > 0  && $(el.prev()[0]).attr('wlxml-tag') === 'span',
  56                         spanAfter = el.next().length > 0 && $(el.next()[0]).attr('wlxml-tag') === 'span';
  57
  58                     var oldText = this.data,
  59                         oldLength = this.data.length;
  60                     var parent = el.parent(),
  61                         parentContents = parent.contents(),
  62                         idx = parentContents.index(this),
  63                         next = idx < parentContents.length - 1 ? parentContents[idx+1] : null;
  64
  65                     var addInfo = function() {
  66                         if(next) {
  67                             $(next).data('orig-before', oldText);
  68                         } else {
  69                             parent.data('orig-append', oldText);
  70                         }
  71                     }
  72
  73                     if(spanParent || spanBefore || spanAfter) {
  74                         var startSpace = /\s/g.test(this.data.substr(0,1));
  75                         var endSpace = /\s/g.test(this.data.substr(-1)) && this.data.length > 1;
  76                         var trimmed = $.trim(this.data);
  77                         var newText = (startSpace && (spanParent || spanBefore) ? ' ' : '')
  78                                     + trimmed
  79                                     + (endSpace && (spanParent || spanAfter) ? ' ' : '');
  80                         if(newText !== oldText) {
  81                             this.data = newText;
  82                             addInfo();
  83                         }
  84                     } else {
  85
  86                         this.data = $.trim(this.data);
  87                         if(this.data.length === 0 && oldLength > 0 && el.parent().contents().length === 1)
  88                             this.data = ' ';
  89                         if(this.data.length === 0) {
  90                             addInfo();
  91                             el.remove();
  92
  93                             return true; // continue
  94                         }
  95                     }
  96
  97                     var element = documentElement.DocumentTextElement.create({text: this.data});
  98                     $(this).replaceWith(element.dom());
  99                 });
 100
 101             this.d = this.wrapper.children(0);
 102
 103             var canvas = this;
 104             this.wrapper.on('keydown', function(e) {
 105                 if(e.which === 13) {
 106                     e.preventDefault();
 107                     var cursor = canvas.getCursor();
 108                     if(!cursor.isSelecting()) {
 109                         var position = cursor.getPosition(),
 110                             elements = position.element.split({offset: position.offset}),
 111                             newEmpty,
 112                             goto;
 113
 114                         if(position.offsetAtBeginning)
 115                             newEmpty = elements.first;
 116                         else if(position.offsetAtEnd)
 117                             newEmpty = elements.second;
 118                         if(newEmpty) {
 119                             goto = newEmpty.append(documentElement.DocumentTextElement.create({text: '\u200B'}, this));
 120                             canvas.setCurrentElement(goto);
 121                         }
 122                     }
 123                 }
 124             });
 125
 126             this.wrapper.on('keyup', function(e) {
 127                 if(e.which >= 37 && e.which <= 40)
 128                     canvas.setCurrentElement(canvas.getCursor().getPosition().element, {caretTo: false})
 129             });
 130
 131             this.wrapper.on('click', '[wlxml-tag], [wlxml-text]', function(e) {
 132                 e.stopPropagation();
 133                 canvas.setCurrentElement(canvas.getDocumentElement(e.target), {caretTo: false});
 134             });
 135
 136         } else {
 137             this.d = null;
 138         }
 139     },
 140
 141     view: function() {
 142         return this.wrapper;
 143     },
 144
 145     doc: function() {
 146         if(this.d === null)
 147             return null;
 148         return documentElement.DocumentNodeElement.fromHTMLElement(this.d.get(0), this); //{wlxmlTag: this.d.prop('tagName')};
 149     },
 150
 151     wrapText: function(params) {
 152         params = _.extend({textNodeIdx: 0}, params);
 153         if(typeof params.textNodeIdx === 'number')
 154             params.textNodeIdx = [params.textNodeIdx];
 155
 156         var childrenInside = params.inside.children(),
 157             idx1 = Math.min.apply(Math, params.textNodeIdx),
 158             idx2 = Math.max.apply(Math, params.textNodeIdx),
 159             textNode1 = childrenInside[idx1],
 160             textNode2 = childrenInside[idx2],
 161             sameNode = textNode1.sameNode(textNode2),
 162             prefixOutside = textNode1.getText().substr(0, params.offsetStart),
 163             prefixInside = textNode1.getText().substr(params.offsetStart),
 164             suffixInside = textNode2.getText().substr(0, params.offsetEnd),
 165             suffixOutside = textNode2.getText().substr(params.offsetEnd)
 166         ;
 167
 168         var wrapperElement = documentElement.DocumentNodeElement.create({tag: params._with.tag, klass: params._with.klass});
 169         textNode1.after(wrapperElement);
 170         textNode1.detach();
 171
 172         if(prefixOutside.length > 0)
 173             wrapperElement.before({text:prefixOutside});
 174         if(sameNode) {
 175             var core = textNode1.getText().substr(params.offsetStart, params.offsetEnd - params.offsetStart);
 176             wrapperElement.append({text: core});
 177         } else {
 178             textNode2.detach();
 179             if(prefixInside.length > 0)
 180                 wrapperElement.append({text: prefixInside});
 181             for(var i = idx1 + 1; i < idx2; i++) {
 182                 wrapperElement.append(childrenInside[i]);
 183             }
 184             if(suffixInside.length > 0)
 185                 wrapperElement.append({text: suffixInside});
 186         }
 187         if(suffixOutside.length > 0)
 188             wrapperElement.after({text: suffixOutside});
 189         return wrapperElement;
 190     },
 191     getDocumentElement: function(from) {
 192         if(from instanceof HTMLElement || from instanceof Text) {
 193            return documentElement.DocumentElement.fromHTMLElement(from, this);
 194         }
 195     },
 196     getCursor: function() {
 197         return new Cursor(this);
 198     },
 199
 200     list: {},
 201
 202
 203
 204     highlightElement: function(element) {
 205         this.wrapper.find('.highlighted-element').removeClass('highlighted-element');
 206         element.dom().addClass('highlighted-element');
 207     },
 208
 209     dimElement: function(element) {
 210         element.dom().removeClass('highlighted-element');
 211     },
 212
 213     getCurrentNodeElement: function() {
 214         return this.getDocumentElement(this.wrapper.find('.current-node-element')[0]);
 215     },
 216
 217     getCurrentTextElement: function() {
 218         return this.getDocumentElement(this.wrapper.find('.current-text-element')[0]);
 219     },
 220
 221
 222
 223     setCurrentElement: function(element, params) {
 224         params = _.extend({caretTo: 'end'}, params);
 225         var findFirstDirectTextChild = function(e, nodeToLand) {
 226             var byBrowser = this.getCursor().getPosition().element;
 227             if(byBrowser && byBrowser.parent().sameNode(nodeToLand))
 228                 return byBrowser;
 229             var children = e.children();
 230             for(var i = 0; i < children.length; i++) {
 231                 if(children[i] instanceof documentElement.DocumentTextElement)
 232                     return children[i];
 233             }
 234             return null;
 235         }.bind(this);
 236         var _markAsCurrent = function(element) {
 237             if(element instanceof documentElement.DocumentTextElement) {
 238                 this.wrapper.find('.current-text-element').removeClass('current-text-element');
 239                 element.dom().addClass('current-text-element');
 240             } else {
 241                 this.wrapper.find('.current-node-element').removeClass('current-node-element')
 242                 element.dom().addClass('current-node-element');
 243                 this.publisher('currentElementChanged', element);
 244             }
 245         }.bind(this);
 246
 247
 248         var isTextElement = element instanceof documentElement.DocumentTextElement,
 249             nodeElementToLand = isTextElement ? element.parent() : element,
 250             textElementToLand = isTextElement ? element : findFirstDirectTextChild(element, nodeElementToLand),
 251             currentTextElement = this.getCurrentTextElement(),
 252             currentNodeElement = this.getCurrentNodeElement();
 253
 254         if(currentTextElement && !(currentTextElement.sameNode(textElementToLand)))
 255             this.wrapper.find('.current-text-element').removeClass('current-text-element');
 256
 257         if(textElementToLand) {
 258             _markAsCurrent(textElementToLand);
 259             if(params.caretTo || !textElementToLand.sameNode(this.getCursor().getPosition().element))
 260                 this._moveCaretToTextElement(textElementToLand, params.caretTo); // as method on element?
 261             if(!(textElementToLand.sameNode(currentTextElement)))
 262                 this.publisher('currentTextElementSet', textElementToLand);
 263         } else {
 264             document.getSelection().removeAllRanges();
 265         }
 266
 267         if(!(currentNodeElement && currentNodeElement.sameNode(nodeElementToLand))) {
 268             _markAsCurrent(nodeElementToLand);
 269
 270             this.publisher('currentNodeElementSet', nodeElementToLand);
 271         }
 272     },
 273
 274     _moveCaretToTextElement: function(element, where) {
 275         var range = document.createRange(),
 276             node = element.dom().contents()[0];
 277
 278         if(typeof where !== 'number') {
 279             range.selectNodeContents(node);
 280         } else {
 281             range.setStart(node, where);
 282         }
 283
 284         var collapseArg = true;
 285         if(where === 'end')
 286             collapseArg = false;
 287         range.collapse(collapseArg);
 288
 289         var selection = document.getSelection();
 290
 291         selection.removeAllRanges();
 292         selection.addRange(range);
 293         this.wrapper.focus(); // FF requires this for caret to be put where range colllapses, Chrome doesn't.
 294     },
 295
 296     setCursorPosition: function(position) {
 297         if(position.element)
 298             this._moveCaretToTextElement(position.element, position.offset);
 299     },
 300
 301     toXML: function() {
 302         var d = function(element, parent, level) {
 303             console.log(element.getText ? 'text: ' + element.getText() : 'node: ' + element.getWlxmlTag());
 304             var isElementNode = element instanceof documentElement.DocumentNodeElement;
 305             parent.prepend(element.toXML(level));
 306             if(isElementNode) {
 307                 var dom = $(parent.children()[0]),
 308                     elementChildren = element.children();
 309                 for(var i = elementChildren.length - 1; i >= 0; i--) {
 310                     d(elementChildren[i], dom, level + 1);
 311                 }
 312             }
 313         }
 314         var parent = $('<div>');
 315         d(this.doc(), parent, 0);
 316         return parent.html();
 317     }
 318 });
 319
 320 $.extend(Canvas.prototype.list, {
 321     create: function(params) {
 322         if(!(params.element1.parent().sameNode(params.element2.parent())))
 323             return false;
 324
 325         var parent = params.element1.parent();
 326
 327         if(parent.childIndex(params.element1) > parent.childIndex(params.element2)) {
 328             var tmp = params.element1;
 329             params.element1 = params.element2;
 330             params.element2 = tmp;
 331         }
 332
 333         var elementsToWrap = [];
 334
 335         var place = 'before';
 336         var canvas = this;
 337         parent.children().some(function(element) {
 338             var _e = element;
 339             if(element.sameNode(params.element1))
 340                 place = 'inside';
 341             if(place === 'inside') {
 342                 if(element instanceof documentElement.DocumentTextElement) {
 343                     element = element.wrapWithNodeElement({tag: 'div', klass: 'list.item'});
 344                     if(element.children()[0].sameNode(params.element1))
 345                         params.element1 = element;
 346                 }
 347                 element.setWlxmlClass('item');
 348                 elementsToWrap.push(element);
 349             }
 350             if(_e.sameNode(params.element2))
 351                 return true;
 352         });
 353
 354         var listElement = documentElement.DocumentNodeElement.create({tag: 'div', klass: 'list-items' + (params.type === 'enum' ? '-enum' : '')});
 355
 356         var toret;
 357         if(parent.is('list')) {
 358             listElement.wrapWithNodeElement({tag: 'div', klass: 'item'});
 359             toret = listElement.parent();
 360         } else {
 361             toret = listElement;
 362         }
 363
 364         params.element1.before(toret);
 365
 366         elementsToWrap.forEach(function(element) {
 367             element.detach();
 368             listElement.append(element);
 369         });
 370     },
 371     extractItems: function(params) {
 372         params = _.extend({merge: true}, params);
 373         var list = params.element1.parent();
 374         if(!list.is('list') || !(list.sameNode(params.element2.parent())))
 375             return false;
 376
 377         var idx1 = list.childIndex(params.element1),
 378             idx2 = list.childIndex(params.element2),
 379             precedingItems = [],
 380             extractedItems = [],
 381             succeedingItems = [],
 382             items = list.children(),
 383             listIsNested = list.parent().getWlxmlClass() === 'item',
 384             i;
 385
 386         if(idx1 > idx2) {
 387             var tmp = idx1; idx1 = idx2; idx2 = tmp;
 388         }
 389
 390         items.forEach(function(item, idx) {
 391             if(idx < idx1)
 392                 precedingItems.push(item);
 393             else if(idx >= idx1 && idx <= idx2) {
 394                 extractedItems.push(item);
 395             }
 396             else {
 397                 succeedingItems.push(item);
 398             }
 399         });
 400
 401         var reference = listIsNested ? list.parent() : list;
 402         if(succeedingItems.length === 0) {
 403             var reference_orig = reference;
 404             extractedItems.forEach(function(item) {
 405                 reference.after(item);
 406                 reference = item;
 407                 if(!listIsNested)
 408                     item.setWlxmlClass(null);
 409             });
 410             if(precedingItems.length === 0)
 411                 reference_orig.detach();
 412         } else if(precedingItems.length === 0) {
 413             extractedItems.forEach(function(item) {
 414                 reference.before(item);
 415                 if(!listIsNested)
 416                     item.setWlxmlClass(null);
 417             });
 418         } else {
 419             extractedItems.forEach(function(item) {
 420                 reference.after(item);
 421                 if(!listIsNested)
 422                     item.setWlxmlClass(null);
 423                 reference = item;
 424             });
 425             var secondList = documentElement.DocumentNodeElement.create({tag: 'div', klass:'list-items'}, this),
 426                 toAdd = secondList;
 427
 428             if(listIsNested) {
 429                 toAdd = secondList.wrapWithNodeElement({tag: 'div', klass:'item'});
 430             }
 431             succeedingItems.forEach(function(item) {
 432                 secondList.append(item);
 433             });
 434
 435             reference.after(toAdd);
 436         }
 437         if(!params.merge && listIsNested) {
 438             return this.extractItems({element1: extractedItems[0], element2: extractedItems[extractedItems.length-1]});
 439         }
 440         return true;
 441     },
 442     areItemsOfTheSameList: function(params) {
 443         var e1 = params.element1,
 444             e2 = params.element2;
 445         return e1.parent().sameNode(e2.parent())
 446             && e1.parent().is('list');
 447     }
 448 });
 449
 450
 451 var Cursor = function(canvas) {
 452     this.canvas = canvas;
 453 };
 454
 455 $.extend(Cursor.prototype, {
 456     isSelecting: function() {
 457         var selection = window.getSelection();
 458         return !selection.isCollapsed;
 459     },
 460     isSelectingWithinElement: function() {
 461         return this.isSelecting() && this.getSelectionStart().element.sameNode(this.getSelectionEnd().element);
 462     },
 463     isSelectingSiblings: function() {
 464         return this.isSelecting() && this.getSelectionStart().element.parent().sameNode(this.getSelectionEnd().element.parent());
 465     },
 466     getPosition: function() {
 467         return this.getSelectionAnchor();
 468     },
 469     getSelectionStart: function() {
 470         return this.getSelectionBoundry('start');
 471     },
 472     getSelectionEnd: function() {
 473         return this.getSelectionBoundry('end');
 474     },
 475     getSelectionAnchor: function() {
 476         return this.getSelectionBoundry('anchor');
 477     },
 478     getSelectionFocus: function() {
 479         return this.getSelectionBoundry('focus');
 480     },
 481     getSelectionBoundry: function(which) {
 482         var selection = window.getSelection(),
 483             anchorElement = this.canvas.getDocumentElement(selection.anchorNode),
 484             focusElement = this.canvas.getDocumentElement(selection.focusNode);
 485
 486         if(anchorElement instanceof documentElement.DocumentNodeElement || focusElement instanceof documentElement.DocumentNodeElement)
 487             return {};
 488
 489         if(which === 'anchor') {
 490             return {
 491                 element: anchorElement,
 492                 offset: selection.anchorOffset,
 493                 offsetAtBeginning: selection.anchorOffset === 0,
 494                 offsetAtEnd: anchorElement && anchorElement.getText().length === selection.anchorOffset
 495             };
 496         }
 497         if(which === 'focus') {
 498             return {
 499                 element: focusElement,
 500                 offset: selection.focusOffset,
 501                 offsetAtBeginning: selection.focusOffset === 0,
 502                 offsetAtEnd: focusElement && focusElement.getText().length === selection.focusOffset
 503             };
 504         }
 505
 506         var element,
 507             offset;
 508
 509         if(anchorElement.parent().sameNode(focusElement.parent())) {
 510             var parent = anchorElement.parent(),
 511                 anchorFirst = parent.childIndex(anchorElement) < parent.childIndex(focusElement);
 512             if(anchorFirst) {
 513                 if(which === 'start') {
 514                     element = anchorElement;
 515                     offset = selection.anchorOffset;
 516                 }
 517                 else if(which === 'end') {
 518                     element = focusElement,
 519                     offset = selection.focusOffset;
 520                 }
 521             } else {
 522                 if(which === 'start') {
 523                     element = focusElement,
 524                     offset = selection.focusOffset
 525                 }
 526                 else if(which === 'end') {
 527                     element = anchorElement;
 528                     offset = selection.anchorOffset;
 529                 }
 530             }
 531         } else {
 532             // TODO: Handle order via https://developer.mozilla.org/en-US/docs/Web/API/Node.compareDocumentPosition
 533             if(which === 'start') {
 534                 element = anchorElement;
 535                 offset = selection.anchorOffset
 536             } else {
 537                 element = focusElement;
 538                 offset = selection.focusOffset
 539             }
 540         }
 541
 542         return {
 543             element: element,
 544             offset: offset,
 545             offsetAtBeginning: offset === 0,
 546             offsetAtEnd: element.getText().length === offset
 547         }
 548     }
 549 })
 550
 551 return {
 552     fromXML: function(xml, publisher) {
 553         return new Canvas(xml, publisher);
 554     }
 555 };
 556
 557 });