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