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 = {}, others = {};
  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                     else if(attr.name !== 'class')
  33                         others[attr.name] = attr.value;
  34                 }
  35
  36                 var element = documentElement.DocumentNodeElement.create({
  37                     tag: currentTag.prop('tagName').toLowerCase(),
  38                     klass: currentTag.attr('class'),
  39                     meta: meta,
  40                     others: others
  41                 });
  42
  43                 element.dom().append(currentTag.contents());
  44                 ['orig-before', 'orig-append'].forEach(function(attr) {
  45                     element.data(attr, '');
  46                 });
  47                 return element.dom();
  48             });
  49
  50             this.wrapper.find(':not(iframe)').addBack().contents()
  51                 .filter(function() {return this.nodeType === Node.TEXT_NODE})
  52                 .each(function() {
  53
  54                     var el = $(this);
  55
  56                     // TODO: use DocumentElement API
  57                     var spanParent = el.parent().attr('wlxml-tag') === 'span',
  58                         spanBefore = el.prev().length > 0  && $(el.prev()[0]).attr('wlxml-tag') === 'span',
  59                         spanAfter = el.next().length > 0 && $(el.next()[0]).attr('wlxml-tag') === 'span';
  60
  61                     var oldText = this.data,
  62                         oldLength = this.data.length;
  63                     var parent = el.parent(),
  64                         parentContents = parent.contents(),
  65                         idx = parentContents.index(this),
  66                         next = idx < parentContents.length - 1 ? parentContents[idx+1] : null;
  67
  68                     var addInfo = function(toAdd) {
  69                         if(next) {
  70                             $(next).data('orig-before', toAdd);
  71                         } else {
  72                             parent.data('orig-append', toAdd);
  73                         }
  74                     }
  75
  76                     if(spanParent || spanBefore || spanAfter) {
  77                         var startSpace = /\s/g.test(this.data.substr(0,1));
  78                         var endSpace = /\s/g.test(this.data.substr(-1)) && this.data.length > 1;
  79                         var trimmed = $.trim(this.data);
  80                         var newText = (startSpace && (spanParent || spanBefore) ? ' ' : '')
  81                                     + trimmed
  82                                     + (endSpace && (spanParent || spanAfter) ? ' ' : '');
  83                         if(newText !== oldText) {
  84                             this.data = newText;
  85                             if(endSpace) {
  86                                 var toAdd = oldText.match(/\s+$/g)[0];
  87                                 if(newText[newText.length - 1] === ' ' && toAdd[0] === ' ')
  88                                     toAdd = toAdd.substr(1);
  89                                 addInfo(toAdd);
  90                             }
  91                         }
  92                     } else {
  93
  94                         this.data = $.trim(this.data);
  95                         if(this.data.length === 0 && oldLength > 0 && el.parent().contents().length === 1)
  96                             this.data = ' ';
  97                         if(this.data.length === 0) {
  98                             addInfo(oldText);
  99                             el.remove();
 100
 101                             return true; // continue
 102                         }
 103                     }
 104
 105                     var element = documentElement.DocumentTextElement.create({text: this.data});
 106                     $(this).replaceWith(element.dom());
 107                 });
 108
 109             this.d = this.wrapper.children(0);
 110
 111             var canvas = this;
 112             this.wrapper.on('keydown', function(e) {
 113                 if(e.which === 13) {
 114                     e.preventDefault();
 115                     var cursor = canvas.getCursor();
 116                     if(!cursor.isSelecting()) {
 117                         var position = cursor.getPosition(),
 118                             elements = position.element.split({offset: position.offset}),
 119                             newEmpty,
 120                             goto;
 121
 122                         if(position.offsetAtBeginning)
 123                             newEmpty = elements.first;
 124                         else if(position.offsetAtEnd)
 125                             newEmpty = elements.second;
 126                         if(newEmpty) {
 127                             goto = newEmpty.append(documentElement.DocumentTextElement.create({text: '\u200B'}, this));
 128                             canvas.setCurrentElement(goto);
 129                         }
 130                     }
 131                 }
 132             });
 133
 134             this.wrapper.on('keyup', function(e) {
 135                 if(e.which >= 37 && e.which <= 40)
 136                     canvas.setCurrentElement(canvas.getCursor().getPosition().element, {caretTo: false})
 137             });
 138
 139             this.wrapper.on('click', '[wlxml-tag], [wlxml-text]', function(e) {
 140                 e.stopPropagation();
 141                 canvas.setCurrentElement(canvas.getDocumentElement(e.target), {caretTo: false});
 142             });
 143
 144         } else {
 145             this.d = null;
 146         }
 147     },
 148
 149     view: function() {
 150         return this.wrapper;
 151     },
 152
 153     doc: function() {
 154         if(this.d === null)
 155             return null;
 156         return documentElement.DocumentNodeElement.fromHTMLElement(this.d.get(0), this); //{wlxmlTag: this.d.prop('tagName')};
 157     },
 158
 159     wrapText: function(params) {
 160         params = _.extend({textNodeIdx: 0}, params);
 161         if(typeof params.textNodeIdx === 'number')
 162             params.textNodeIdx = [params.textNodeIdx];
 163
 164         var childrenInside = params.inside.children(),
 165             idx1 = Math.min.apply(Math, params.textNodeIdx),
 166             idx2 = Math.max.apply(Math, params.textNodeIdx),
 167             textNode1 = childrenInside[idx1],
 168             textNode2 = childrenInside[idx2],
 169             sameNode = textNode1.sameNode(textNode2),
 170             prefixOutside = textNode1.getText().substr(0, params.offsetStart),
 171             prefixInside = textNode1.getText().substr(params.offsetStart),
 172             suffixInside = textNode2.getText().substr(0, params.offsetEnd),
 173             suffixOutside = textNode2.getText().substr(params.offsetEnd)
 174         ;
 175
 176         var wrapperElement = documentElement.DocumentNodeElement.create({tag: params._with.tag, klass: params._with.klass});
 177         textNode1.after(wrapperElement);
 178         textNode1.detach();
 179
 180         if(prefixOutside.length > 0)
 181             wrapperElement.before({text:prefixOutside});
 182         if(sameNode) {
 183             var core = textNode1.getText().substr(params.offsetStart, params.offsetEnd - params.offsetStart);
 184             wrapperElement.append({text: core});
 185         } else {
 186             textNode2.detach();
 187             if(prefixInside.length > 0)
 188                 wrapperElement.append({text: prefixInside});
 189             for(var i = idx1 + 1; i < idx2; i++) {
 190                 wrapperElement.append(childrenInside[i]);
 191             }
 192             if(suffixInside.length > 0)
 193                 wrapperElement.append({text: suffixInside});
 194         }
 195         if(suffixOutside.length > 0)
 196             wrapperElement.after({text: suffixOutside});
 197         return wrapperElement;
 198     },
 199     getDocumentElement: function(from) {
 200         if(from instanceof HTMLElement || from instanceof Text) {
 201            return documentElement.DocumentElement.fromHTMLElement(from, this);
 202         }
 203     },
 204     getCursor: function() {
 205         return new Cursor(this);
 206     },
 207
 208     list: {},
 209
 210
 211
 212     highlightElement: function(element) {
 213         this.wrapper.find('.highlighted-element').removeClass('highlighted-element');
 214         element.dom().addClass('highlighted-element');
 215     },
 216
 217     dimElement: function(element) {
 218         element.dom().removeClass('highlighted-element');
 219     },
 220
 221     getCurrentNodeElement: function() {
 222         return this.getDocumentElement(this.wrapper.find('.current-node-element')[0]);
 223     },
 224
 225     getCurrentTextElement: function() {
 226         return this.getDocumentElement(this.wrapper.find('.current-text-element')[0]);
 227     },
 228
 229
 230
 231     setCurrentElement: function(element, params) {
 232         params = _.extend({caretTo: 'end'}, params);
 233         var findFirstDirectTextChild = function(e, nodeToLand) {
 234             var byBrowser = this.getCursor().getPosition().element;
 235             if(byBrowser && byBrowser.parent().sameNode(nodeToLand))
 236                 return byBrowser;
 237             var children = e.children();
 238             for(var i = 0; i < children.length; i++) {
 239                 if(children[i] instanceof documentElement.DocumentTextElement)
 240                     return children[i];
 241             }
 242             return null;
 243         }.bind(this);
 244         var _markAsCurrent = function(element) {
 245             if(element instanceof documentElement.DocumentTextElement) {
 246                 this.wrapper.find('.current-text-element').removeClass('current-text-element');
 247                 element.dom().addClass('current-text-element');
 248             } else {
 249                 this.wrapper.find('.current-node-element').removeClass('current-node-element')
 250                 element.dom().addClass('current-node-element');
 251                 this.publisher('currentElementChanged', element);
 252             }
 253         }.bind(this);
 254
 255
 256         var isTextElement = element instanceof documentElement.DocumentTextElement,
 257             nodeElementToLand = isTextElement ? element.parent() : element,
 258             textElementToLand = isTextElement ? element : findFirstDirectTextChild(element, nodeElementToLand),
 259             currentTextElement = this.getCurrentTextElement(),
 260             currentNodeElement = this.getCurrentNodeElement();
 261
 262         if(currentTextElement && !(currentTextElement.sameNode(textElementToLand)))
 263             this.wrapper.find('.current-text-element').removeClass('current-text-element');
 264
 265         if(textElementToLand) {
 266             _markAsCurrent(textElementToLand);
 267             if(params.caretTo || !textElementToLand.sameNode(this.getCursor().getPosition().element))
 268                 this._moveCaretToTextElement(textElementToLand, params.caretTo); // as method on element?
 269             if(!(textElementToLand.sameNode(currentTextElement)))
 270                 this.publisher('currentTextElementSet', textElementToLand);
 271         } else {
 272             document.getSelection().removeAllRanges();
 273         }
 274
 275         if(!(currentNodeElement && currentNodeElement.sameNode(nodeElementToLand))) {
 276             _markAsCurrent(nodeElementToLand);
 277
 278             this.publisher('currentNodeElementSet', nodeElementToLand);
 279         }
 280     },
 281
 282     _moveCaretToTextElement: function(element, where) {
 283         var range = document.createRange(),
 284             node = element.dom().contents()[0];
 285
 286         if(typeof where !== 'number') {
 287             range.selectNodeContents(node);
 288         } else {
 289             range.setStart(node, where);
 290         }
 291
 292         var collapseArg = true;
 293         if(where === 'end')
 294             collapseArg = false;
 295         range.collapse(collapseArg);
 296
 297         var selection = document.getSelection();
 298
 299         selection.removeAllRanges();
 300         selection.addRange(range);
 301         this.wrapper.focus(); // FF requires this for caret to be put where range colllapses, Chrome doesn't.
 302     },
 303
 304     setCursorPosition: function(position) {
 305         if(position.element)
 306             this._moveCaretToTextElement(position.element, position.offset);
 307     },
 308
 309     toXML: function() {
 310         var d = function(element, parent, level) {
 311             console.log(element.getText ? 'text: ' + element.getText() : 'node: ' + element.getWlxmlTag());
 312             var isElementNode = element instanceof documentElement.DocumentNodeElement;
 313             parent.prepend(element.toXML(level));
 314             if(isElementNode) {
 315                 var dom = $(parent.children()[0]),
 316                     elementChildren = element.children();
 317                 for(var i = elementChildren.length - 1; i >= 0; i--) {
 318                     d(elementChildren[i], dom, level + 1);
 319                 }
 320             }
 321         }
 322         var parent = $('<div>');
 323         d(this.doc(), parent, 0);
 324         return parent.html();
 325     }
 326 });
 327
 328 $.extend(Canvas.prototype.list, {
 329     create: function(params) {
 330         if(!(params.element1.parent().sameNode(params.element2.parent())))
 331             return false;
 332
 333         var parent = params.element1.parent();
 334
 335         if(parent.childIndex(params.element1) > parent.childIndex(params.element2)) {
 336             var tmp = params.element1;
 337             params.element1 = params.element2;
 338             params.element2 = tmp;
 339         }
 340
 341         var elementsToWrap = [];
 342
 343         var place = 'before';
 344         var canvas = this;
 345         parent.children().some(function(element) {
 346             var _e = element;
 347             if(element.sameNode(params.element1))
 348                 place = 'inside';
 349             if(place === 'inside') {
 350                 if(element instanceof documentElement.DocumentTextElement) {
 351                     element = element.wrapWithNodeElement({tag: 'div', klass: 'list.item'});
 352                     if(element.children()[0].sameNode(params.element1))
 353                         params.element1 = element;
 354                 }
 355                 element.setWlxmlClass('item');
 356                 elementsToWrap.push(element);
 357             }
 358             if(_e.sameNode(params.element2))
 359                 return true;
 360         });
 361
 362         var listElement = documentElement.DocumentNodeElement.create({tag: 'div', klass: 'list-items' + (params.type === 'enum' ? '-enum' : '')});
 363
 364         var toret;
 365         if(parent.is('list')) {
 366             listElement.wrapWithNodeElement({tag: 'div', klass: 'item'});
 367             toret = listElement.parent();
 368         } else {
 369             toret = listElement;
 370         }
 371
 372         params.element1.before(toret);
 373
 374         elementsToWrap.forEach(function(element) {
 375             element.detach();
 376             listElement.append(element);
 377         });
 378     },
 379     extractItems: function(params) {
 380         params = _.extend({merge: true}, params);
 381         var list = params.element1.parent();
 382         if(!list.is('list') || !(list.sameNode(params.element2.parent())))
 383             return false;
 384
 385         var idx1 = list.childIndex(params.element1),
 386             idx2 = list.childIndex(params.element2),
 387             precedingItems = [],
 388             extractedItems = [],
 389             succeedingItems = [],
 390             items = list.children(),
 391             listIsNested = list.parent().getWlxmlClass() === 'item',
 392             i;
 393
 394         if(idx1 > idx2) {
 395             var tmp = idx1; idx1 = idx2; idx2 = tmp;
 396         }
 397
 398         items.forEach(function(item, idx) {
 399             if(idx < idx1)
 400                 precedingItems.push(item);
 401             else if(idx >= idx1 && idx <= idx2) {
 402                 extractedItems.push(item);
 403             }
 404             else {
 405                 succeedingItems.push(item);
 406             }
 407         });
 408
 409         var reference = listIsNested ? list.parent() : list;
 410         if(succeedingItems.length === 0) {
 411             var reference_orig = reference;
 412             extractedItems.forEach(function(item) {
 413                 reference.after(item);
 414                 reference = item;
 415                 if(!listIsNested)
 416                     item.setWlxmlClass(null);
 417             });
 418             if(precedingItems.length === 0)
 419                 reference_orig.detach();
 420         } else if(precedingItems.length === 0) {
 421             extractedItems.forEach(function(item) {
 422                 reference.before(item);
 423                 if(!listIsNested)
 424                     item.setWlxmlClass(null);
 425             });
 426         } else {
 427             extractedItems.forEach(function(item) {
 428                 reference.after(item);
 429                 if(!listIsNested)
 430                     item.setWlxmlClass(null);
 431                 reference = item;
 432             });
 433             var secondList = documentElement.DocumentNodeElement.create({tag: 'div', klass:'list-items'}, this),
 434                 toAdd = secondList;
 435
 436             if(listIsNested) {
 437                 toAdd = secondList.wrapWithNodeElement({tag: 'div', klass:'item'});
 438             }
 439             succeedingItems.forEach(function(item) {
 440                 secondList.append(item);
 441             });
 442
 443             reference.after(toAdd);
 444         }
 445         if(!params.merge && listIsNested) {
 446             return this.extractItems({element1: extractedItems[0], element2: extractedItems[extractedItems.length-1]});
 447         }
 448         return true;
 449     },
 450     areItemsOfTheSameList: function(params) {
 451         var e1 = params.element1,
 452             e2 = params.element2;
 453         return e1.parent().sameNode(e2.parent())
 454             && e1.parent().is('list');
 455     }
 456 });
 457
 458
 459 var Cursor = function(canvas) {
 460     this.canvas = canvas;
 461 };
 462
 463 $.extend(Cursor.prototype, {
 464     isSelecting: function() {
 465         var selection = window.getSelection();
 466         return !selection.isCollapsed;
 467     },
 468     isSelectingWithinElement: function() {
 469         return this.isSelecting() && this.getSelectionStart().element.sameNode(this.getSelectionEnd().element);
 470     },
 471     isSelectingSiblings: function() {
 472         return this.isSelecting() && this.getSelectionStart().element.parent().sameNode(this.getSelectionEnd().element.parent());
 473     },
 474     getPosition: function() {
 475         return this.getSelectionAnchor();
 476     },
 477     getSelectionStart: function() {
 478         return this.getSelectionBoundry('start');
 479     },
 480     getSelectionEnd: function() {
 481         return this.getSelectionBoundry('end');
 482     },
 483     getSelectionAnchor: function() {
 484         return this.getSelectionBoundry('anchor');
 485     },
 486     getSelectionFocus: function() {
 487         return this.getSelectionBoundry('focus');
 488     },
 489     getSelectionBoundry: function(which) {
 490         var selection = window.getSelection(),
 491             anchorElement = this.canvas.getDocumentElement(selection.anchorNode),
 492             focusElement = this.canvas.getDocumentElement(selection.focusNode);
 493
 494         if(anchorElement instanceof documentElement.DocumentNodeElement || focusElement instanceof documentElement.DocumentNodeElement)
 495             return {};
 496
 497         if(which === 'anchor') {
 498             return {
 499                 element: anchorElement,
 500                 offset: selection.anchorOffset,
 501                 offsetAtBeginning: selection.anchorOffset === 0,
 502                 offsetAtEnd: anchorElement && anchorElement.getText().length === selection.anchorOffset
 503             };
 504         }
 505         if(which === 'focus') {
 506             return {
 507                 element: focusElement,
 508                 offset: selection.focusOffset,
 509                 offsetAtBeginning: selection.focusOffset === 0,
 510                 offsetAtEnd: focusElement && focusElement.getText().length === selection.focusOffset
 511             };
 512         }
 513
 514         var element,
 515             offset;
 516
 517         if(anchorElement.parent().sameNode(focusElement.parent())) {
 518             var parent = anchorElement.parent(),
 519                 anchorFirst = parent.childIndex(anchorElement) < parent.childIndex(focusElement);
 520             if(anchorFirst) {
 521                 if(which === 'start') {
 522                     element = anchorElement;
 523                     offset = selection.anchorOffset;
 524                 }
 525                 else if(which === 'end') {
 526                     element = focusElement,
 527                     offset = selection.focusOffset;
 528                 }
 529             } else {
 530                 if(which === 'start') {
 531                     element = focusElement,
 532                     offset = selection.focusOffset
 533                 }
 534                 else if(which === 'end') {
 535                     element = anchorElement;
 536                     offset = selection.anchorOffset;
 537                 }
 538             }
 539         } else {
 540             // TODO: Handle order via https://developer.mozilla.org/en-US/docs/Web/API/Node.compareDocumentPosition
 541             if(which === 'start') {
 542                 element = anchorElement;
 543                 offset = selection.anchorOffset
 544             } else {
 545                 element = focusElement;
 546                 offset = selection.focusOffset
 547             }
 548         }
 549
 550         return {
 551             element: element,
 552             offset: offset,
 553             offsetAtBeginning: offset === 0,
 554             offsetAtEnd: element.getText().length === offset
 555         }
 556     }
 557 })
 558
 559 return {
 560     fromXML: function(xml, publisher) {
 561         return new Canvas(xml, publisher);
 562     }
 563 };
 564
 565 });