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