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