src/editor/modules/documentCanvas/canvas/canvas.js

   1 define([
   2 'libs/jquery',
   3 'libs/underscore',
   4 'libs/backbone',
   5 'modules/documentCanvas/canvas/documentElement',
   6 'modules/documentCanvas/canvas/keyboard',
   7 'modules/documentCanvas/canvas/utils',
   8 'modules/documentCanvas/canvas/wlxmlListener'
   9 ], function($, _, Backbone, documentElement, keyboard, utils, wlxmlListener) {
  10
  11 'use strict';
  12
  13 var Canvas = function(wlxmlDocument, publisher) {
  14     this.eventBus = _.extend({}, Backbone.Events);
  15     this.wrapper = $('<div>').addClass('canvas-wrapper').attr('contenteditable', true);
  16     this.wlxmlListener = wlxmlListener.create(this);
  17     this.loadWlxmlDocument(wlxmlDocument);
  18     this.publisher = publisher ? publisher : function() {};
  19 };
  20
  21 $.extend(Canvas.prototype, {
  22
  23     loadWlxmlDocument: function(wlxmlDocument) {
  24         if(!wlxmlDocument) {
  25             return false;
  26         }
  27
  28         var canvasDOM = this.generateCanvasDOM(wlxmlDocument.root);
  29
  30         this.wrapper.empty();
  31         this.wrapper.append(canvasDOM);
  32         this.d = this.wrapper.children(0);
  33         this.setupEventHandling();
  34
  35         this.wlxmlListener.listenTo(wlxmlDocument);
  36         this.wlxmlDocument = wlxmlDocument;
  37     },
  38
  39     generateCanvasDOM: function(wlxmlNode) {
  40         var element = documentElement.DocumentNodeElement.create(wlxmlNode, this);
  41         return element.dom();
  42     },
  43
  44     setupEventHandling: function() {
  45         var canvas = this;
  46         this.wrapper.on('keyup keydown keypress', function(e) {
  47             keyboard.handleKey(e, this);
  48         }.bind(this));
  49
  50         this.wrapper.on('click', '[document-node-element], [document-text-element]', function(e) {
  51             e.stopPropagation();
  52             canvas.setCurrentElement(canvas.getDocumentElement(e.currentTarget), {caretTo: false});
  53         });
  54
  55         var observer = new MutationObserver(function(mutations) {
  56             mutations.forEach(function(mutation) {
  57                 if(documentElement.DocumentTextElement.isContentContainer(mutation.target)) {
  58                     observer.disconnect();
  59                     if(mutation.target.data === '')
  60                         mutation.target.data = utils.unicode.ZWS;
  61                     else if(mutation.oldValue === utils.unicode.ZWS) {
  62                         mutation.target.data = mutation.target.data.replace(utils.unicode.ZWS, '');
  63                         canvas._moveCaretToTextElement(canvas.getDocumentElement(mutation.target), 'end');
  64                     }
  65                     observer.observe(canvas.d[0], config);
  66                     canvas.publisher('contentChanged');
  67
  68                     var textElement = canvas.getDocumentElement(mutation.target),
  69                         toSet = mutation.target.data !== utils.unicode.ZWS ? mutation.target.data : '';
  70
  71                     textElement.data('wlxmlNode').setText(toSet);
  72                 }
  73             });
  74         });
  75         var config = { attributes: false, childList: false, characterData: true, subtree: true, characterDataOldValue: true};
  76         observer.observe(this.d[0], config);
  77
  78
  79         this.wrapper.on('mouseover', '[document-node-element], [document-text-element]', function(e) {
  80             var el = canvas.getDocumentElement(e.currentTarget);
  81             if(!el)
  82                 return;
  83             e.stopPropagation();
  84             if(el instanceof documentElement.DocumentTextElement)
  85                 el = el.parent();
  86             el.toggleLabel(true);
  87         });
  88         this.wrapper.on('mouseout', '[document-node-element], [document-text-element]', function(e) {
  89             var el = canvas.getDocumentElement(e.currentTarget);
  90             if(!el)
  91                 return;
  92             e.stopPropagation();
  93             if(el instanceof documentElement.DocumentTextElement)
  94                 el = el.parent();
  95             el.toggleLabel(false);
  96         });
  97
  98         this.eventBus.on('elementToggled', function(toggle, element) {
  99             if(!toggle) {
 100                 canvas.setCurrentElement(element.getPreviousTextElement());
 101             }
 102         });
 103     },
 104
 105     view: function() {
 106         return this.wrapper;
 107     },
 108
 109     doc: function() {
 110         if(this.d === null)
 111             return null;
 112         return documentElement.DocumentNodeElement.fromHTMLElement(this.d.get(0), this); //{wlxmlTag: this.d.prop('tagName')};
 113     },
 114
 115     toggleElementHighlight: function(node, toggle) {
 116         var element = utils.findCanvasElement(node);
 117         element.toggleHighlight(toggle);
 118     },
 119
 120     createNodeElement: function(params) {
 121         return documentElement.DocumentNodeElement.create(params, this);
 122     },
 123
 124     wrapText: function(params) {
 125         params = _.extend({textNodeIdx: 0}, params);
 126         if(typeof params.textNodeIdx === 'number')
 127             params.textNodeIdx = [params.textNodeIdx];
 128
 129         var childrenInside = params.inside.children(),
 130             idx1 = Math.min.apply(Math, params.textNodeIdx),
 131             idx2 = Math.max.apply(Math, params.textNodeIdx),
 132             textNode1 = childrenInside[idx1],
 133             textNode2 = childrenInside[idx2],
 134             sameNode = textNode1.sameNode(textNode2),
 135             prefixOutside = textNode1.getText().substr(0, params.offsetStart),
 136             prefixInside = textNode1.getText().substr(params.offsetStart),
 137             suffixInside = textNode2.getText().substr(0, params.offsetEnd),
 138             suffixOutside = textNode2.getText().substr(params.offsetEnd)
 139         ;
 140
 141         var wrapperElement = this.createNodeElement({tag: params._with.tag, klass: params._with.klass});
 142         textNode1.after(wrapperElement);
 143         textNode1.detach();
 144
 145         if(prefixOutside.length > 0)
 146             wrapperElement.before({text:prefixOutside});
 147         if(sameNode) {
 148             var core = textNode1.getText().substr(params.offsetStart, params.offsetEnd - params.offsetStart);
 149             wrapperElement.append({text: core});
 150         } else {
 151             textNode2.detach();
 152             if(prefixInside.length > 0)
 153                 wrapperElement.append({text: prefixInside});
 154             for(var i = idx1 + 1; i < idx2; i++) {
 155                 wrapperElement.append(childrenInside[i]);
 156             }
 157             if(suffixInside.length > 0)
 158                 wrapperElement.append({text: suffixInside});
 159         }
 160         if(suffixOutside.length > 0)
 161             wrapperElement.after({text: suffixOutside});
 162         return wrapperElement;
 163     },
 164
 165     wrapElements: function(params) {
 166         if(!(params.element1.parent().sameNode(params.element2.parent())))
 167             return;
 168
 169         var parent = params.element1.parent(),
 170             parentChildren = parent.children(),
 171             wrapper = this.createNodeElement({
 172                 tag: params._with.tag,
 173                 klass: params._with.klass}),
 174             idx1 = parent.childIndex(params.element1),
 175             idx2 = parent.childIndex(params.element2);
 176
 177         if(idx1 > idx2) {
 178             var tmp = idx1;
 179             idx1 = idx2;
 180             idx2 = tmp;
 181         }
 182
 183         var insertingMethod, insertingTarget;
 184         if(idx1 === 0) {
 185             insertingMethod = 'prepend';
 186             insertingTarget = parent;
 187         } else {
 188             insertingMethod = 'after';
 189             insertingTarget = parentChildren[idx1-1];
 190         }
 191
 192         for(var i = idx1; i <= idx2; i++) {
 193             wrapper.append(parentChildren[i].detach());
 194         }
 195
 196         insertingTarget[insertingMethod](wrapper);
 197         return wrapper;
 198     },
 199
 200     getSiblingParents: function(params) {
 201         var parents1 = [params.element1].concat(params.element1.parents()).reverse(),
 202             parents2 = [params.element2].concat(params.element2.parents()).reverse(),
 203             noSiblingParents = null;
 204
 205         if(parents1.length === 0 || parents2.length === 0 || !(parents1[0].sameNode(parents2[0])))
 206             return noSiblingParents;
 207
 208         var i;
 209         for(i = 0; i < Math.min(parents1.length, parents2.length); i++) {
 210             if(parents1[i].sameNode(parents2[i]))
 211                 continue;
 212             break;
 213         }
 214         return {element1: parents1[i], element2: parents2[i]};
 215     },
 216
 217     getDocumentElement: function(from) {
 218         if(from instanceof HTMLElement || from instanceof Text) {
 219            return documentElement.DocumentElement.fromHTMLElement(from, this);
 220         }
 221     },
 222     getCursor: function() {
 223         return new Cursor(this);
 224     },
 225
 226     list: {},
 227
 228
 229     getCurrentNodeElement: function() {
 230         return this.getDocumentElement(this.wrapper.find('.current-node-element').parent()[0]);
 231     },
 232
 233     getCurrentTextElement: function() {
 234         return this.getDocumentElement(this.wrapper.find('.current-text-element')[0]);
 235     },
 236
 237
 238
 239     setCurrentElement: function(element, params) {
 240         if(!(element instanceof documentElement.DocumentElement)) {
 241             element = utils.findCanvasElement(element);
 242         }
 243
 244         params = _.extend({caretTo: 'end'}, params);
 245         var findFirstDirectTextChild = function(e, nodeToLand) {
 246             var byBrowser = this.getCursor().getPosition().element;
 247             if(byBrowser && byBrowser.parent().sameNode(nodeToLand))
 248                 return byBrowser;
 249             var children = e.children();
 250             for(var i = 0; i < children.length; i++) {
 251                 if(children[i] instanceof documentElement.DocumentTextElement)
 252                     return children[i];
 253             }
 254             return null;
 255         }.bind(this);
 256         var _markAsCurrent = function(element) {
 257             if(element instanceof documentElement.DocumentTextElement) {
 258                 this.wrapper.find('.current-text-element').removeClass('current-text-element');
 259                 element.dom().addClass('current-text-element');
 260             } else {
 261                 this.wrapper.find('.current-node-element').removeClass('current-node-element')
 262                 element._container().addClass('current-node-element');
 263                 this.publisher('currentElementChanged', element);
 264             }
 265         }.bind(this);
 266
 267
 268         var isTextElement = element instanceof documentElement.DocumentTextElement,
 269             nodeElementToLand = isTextElement ? element.parent() : element,
 270             textElementToLand = isTextElement ? element : findFirstDirectTextChild(element, nodeElementToLand),
 271             currentTextElement = this.getCurrentTextElement(),
 272             currentNodeElement = this.getCurrentNodeElement();
 273
 274         if(currentTextElement && !(currentTextElement.sameNode(textElementToLand)))
 275             this.wrapper.find('.current-text-element').removeClass('current-text-element');
 276
 277         if(textElementToLand) {
 278             _markAsCurrent(textElementToLand);
 279             if(params.caretTo || !textElementToLand.sameNode(this.getCursor().getPosition().element))
 280                 this._moveCaretToTextElement(textElementToLand, params.caretTo); // as method on element?
 281             if(!(textElementToLand.sameNode(currentTextElement)))
 282                 this.publisher('currentTextElementSet', textElementToLand.data('wlxmlNode'));
 283         } else {
 284             document.getSelection().removeAllRanges();
 285         }
 286
 287         if(!(currentNodeElement && currentNodeElement.sameNode(nodeElementToLand))) {
 288             _markAsCurrent(nodeElementToLand);
 289
 290             this.publisher('currentNodeElementSet', nodeElementToLand.data('wlxmlNode'));
 291         }
 292     },
 293
 294     _moveCaretToTextElement: function(element, where) {
 295         var range = document.createRange(),
 296             node = element.dom().contents()[0];
 297
 298         if(typeof where !== 'number') {
 299             range.selectNodeContents(node);
 300         } else {
 301             range.setStart(node, where);
 302         }
 303
 304         var collapseArg = true;
 305         if(where === 'end')
 306             collapseArg = false;
 307         range.collapse(collapseArg);
 308
 309         var selection = document.getSelection();
 310
 311         selection.removeAllRanges();
 312         selection.addRange(range);
 313         this.wrapper.focus(); // FF requires this for caret to be put where range colllapses, Chrome doesn't.
 314     },
 315
 316     setCursorPosition: function(position) {
 317         if(position.element)
 318             this._moveCaretToTextElement(position.element, position.offset);
 319     }
 320 });
 321
 322 $.extend(Canvas.prototype.list, {
 323     create: function(params) {
 324         if(!(params.element1.parent().sameNode(params.element2.parent())))
 325             return false;
 326
 327         var parent = params.element1.parent(),
 328             canvas = params.element1.canvas;
 329
 330         if(parent.childIndex(params.element1) > parent.childIndex(params.element2)) {
 331             var tmp = params.element1;
 332             params.element1 = params.element2;
 333             params.element2 = tmp;
 334         }
 335
 336         var elementsToWrap = [];
 337
 338         var place = 'before';
 339         parent.children().some(function(element) {
 340             var _e = element;
 341             if(element.sameNode(params.element1))
 342                 place = 'inside';
 343             if(place === 'inside') {
 344                 if(element instanceof documentElement.DocumentTextElement) {
 345                     element = element.wrapWithNodeElement({tag: 'div', klass: 'list.item'});
 346                     if(element.children()[0].sameNode(params.element1))
 347                         params.element1 = element;
 348                 }
 349                 element.setWlxmlClass('item');
 350                 elementsToWrap.push(element);
 351             }
 352             if(_e.sameNode(params.element2))
 353                 return true;
 354         });
 355
 356         var listElement = canvas.createNodeElement({tag: 'div', klass: 'list-items' + (params.type === 'enum' ? '-enum' : '')});
 357         var toret;
 358         if(parent.is('list')) {
 359             var item = listElement.wrapWithNodeElement({tag: 'div', klass: 'item'});
 360             item.exec('toggleBullet', false);
 361             toret = listElement.parent();
 362         } else {
 363             toret = listElement;
 364         }
 365
 366         params.element1.before(toret);
 367
 368         elementsToWrap.forEach(function(element) {
 369             element.detach();
 370             listElement.append(element);
 371         });
 372     },
 373     extractItems: function(params) {
 374         params = _.extend({merge: true}, params);
 375         var list = params.element1.parent();
 376         if(!list.is('list') || !(list.sameNode(params.element2.parent())))
 377             return false;
 378
 379         var idx1 = list.childIndex(params.element1),
 380             idx2 = list.childIndex(params.element2),
 381             precedingItems = [],
 382             extractedItems = [],
 383             succeedingItems = [],
 384             items = list.children(),
 385             listIsNested = list.parent().getWlxmlClass() === 'item',
 386             canvas = params.element1.canvas,
 387             i;
 388
 389         if(idx1 > idx2) {
 390             var tmp = idx1; idx1 = idx2; idx2 = tmp;
 391         }
 392
 393         items.forEach(function(item, idx) {
 394             if(idx < idx1)
 395                 precedingItems.push(item);
 396             else if(idx >= idx1 && idx <= idx2) {
 397                 extractedItems.push(item);
 398             }
 399             else {
 400                 succeedingItems.push(item);
 401             }
 402         });
 403
 404         var reference = listIsNested ? list.parent() : list;
 405         if(succeedingItems.length === 0) {
 406             var reference_orig = reference;
 407             extractedItems.forEach(function(item) {
 408                 reference.after(item);
 409                 reference = item;
 410                 if(!listIsNested)
 411                     item.setWlxmlClass(null);
 412             });
 413             if(precedingItems.length === 0)
 414                 reference_orig.detach();
 415         } else if(precedingItems.length === 0) {
 416             extractedItems.forEach(function(item) {
 417                 reference.before(item);
 418                 if(!listIsNested)
 419                     item.setWlxmlClass(null);
 420             });
 421         } else {
 422             extractedItems.forEach(function(item) {
 423                 reference.after(item);
 424                 if(!listIsNested)
 425                     item.setWlxmlClass(null);
 426                 reference = item;
 427             });
 428             var secondList = canvas.createNodeElement({tag: 'div', klass:'list-items'}),
 429                 toAdd = secondList;
 430
 431             if(listIsNested) {
 432                 toAdd = secondList.wrapWithNodeElement({tag: 'div', klass:'item'});
 433             }
 434             succeedingItems.forEach(function(item) {
 435                 secondList.append(item);
 436             });
 437
 438             reference.after(toAdd);
 439         }
 440         if(!params.merge && listIsNested) {
 441             return this.extractItems({element1: extractedItems[0], element2: extractedItems[extractedItems.length-1]});
 442         }
 443         return true;
 444     },
 445     areItemsOfTheSameList: function(params) {
 446         var e1 = params.element1,
 447             e2 = params.element2;
 448         return e1.parent().sameNode(e2.parent())
 449             && e1.parent().is('list');
 450     }
 451 });
 452
 453
 454 var Cursor = function(canvas) {
 455     this.canvas = canvas;
 456 };
 457
 458 $.extend(Cursor.prototype, {
 459     isSelecting: function() {
 460         var selection = window.getSelection();
 461         return !selection.isCollapsed;
 462     },
 463     isSelectingWithinElement: function() {
 464         return this.isSelecting() && this.getSelectionStart().element.sameNode(this.getSelectionEnd().element);
 465     },
 466     isSelectingSiblings: function() {
 467         return this.isSelecting() && this.getSelectionStart().element.parent().sameNode(this.getSelectionEnd().element.parent());
 468     },
 469     getPosition: function() {
 470         return this.getSelectionAnchor();
 471     },
 472     getSelectionStart: function() {
 473         return this.getSelectionBoundry('start');
 474     },
 475     getSelectionEnd: function() {
 476         return this.getSelectionBoundry('end');
 477     },
 478     getSelectionAnchor: function() {
 479         return this.getSelectionBoundry('anchor');
 480     },
 481     getSelectionFocus: function() {
 482         return this.getSelectionBoundry('focus');
 483     },
 484     getSelectionBoundry: function(which) {
 485         var selection = window.getSelection(),
 486             anchorElement = this.canvas.getDocumentElement(selection.anchorNode),
 487             focusElement = this.canvas.getDocumentElement(selection.focusNode);
 488
 489         if((!anchorElement) || (anchorElement instanceof documentElement.DocumentNodeElement) || (!focusElement) || focusElement instanceof documentElement.DocumentNodeElement)
 490             return {};
 491
 492         if(which === 'anchor') {
 493             return {
 494                 element: anchorElement,
 495                 offset: selection.anchorOffset,
 496                 offsetAtBeginning: selection.anchorOffset === 0,
 497                 offsetAtEnd: selection.anchorNode.data.length === selection.anchorOffset
 498             };
 499         }
 500         if(which === 'focus') {
 501             return {
 502                 element: focusElement,
 503                 offset: selection.focusOffset,
 504                 offsetAtBeginning: selection.focusOffset === 0,
 505                 offsetAtEnd: selection.focusNode.data.length === selection.focusOffset
 506             };
 507         }
 508
 509         var element,
 510             offset;
 511
 512         if(anchorElement.parent().sameNode(focusElement.parent())) {
 513             var parent = anchorElement.parent(),
 514                 anchorFirst = parent.childIndex(anchorElement) < parent.childIndex(focusElement);
 515             if(anchorFirst) {
 516                 if(which === 'start') {
 517                     element = anchorElement;
 518                     offset = selection.anchorOffset
 519                 }
 520                 else if(which === 'end') {
 521                     element = focusElement,
 522                     offset = selection.focusOffset
 523                 }
 524             } else {
 525                 if(which === 'start') {
 526                     element = focusElement,
 527                     offset = selection.focusOffset
 528                 }
 529                 else if(which === 'end') {
 530                     element = anchorElement;
 531                     offset = selection.anchorOffset
 532                 }
 533             }
 534         } else {
 535             // TODO: Handle order via https://developer.mozilla.org/en-US/docs/Web/API/Node.compareDocumentPosition
 536             if(which === 'start') {
 537                 element = anchorElement;
 538                 offset = selection.anchorOffset
 539             } else {
 540                 element = focusElement;
 541                 offset = selection.focusOffset
 542             }
 543         }
 544
 545         var nodeLen = (element.sameNode(focusElement) ? selection.focusNode : selection.anchorNode).length;
 546         return {
 547             element: element,
 548             offset: offset,
 549             offsetAtBeginning: offset === 0,
 550             offsetAtEnd: nodeLen === offset
 551         }
 552     }
 553 })
 554
 555 return {
 556     fromXMLDocument: function(wlxmlDocument, publisher) {
 557         return new Canvas(wlxmlDocument, publisher);
 558     }
 559 };
 560
 561 });