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 ], function($, _, Backbone, documentElement, keyboard, utils) {
   9
  10 'use strict';
  11
  12 var Canvas = function(wlxml, publisher) {
  13     this.eventBus = _.extend({}, Backbone.Events);
  14     this.loadWlxmlDocument(wlxml);
  15     this.publisher = publisher ? publisher : function() {};
  16 };
  17
  18 $.extend(Canvas.prototype, {
  19
  20     loadWlxmlDocument: function(wlxmlDocument) {
  21         var canvasDOM = this.generateCanvasDOM(wlxmlDocument.root);
  22
  23         this.wrapper = $('<div>').addClass('canvas-wrapper').attr('contenteditable', true);
  24         this.wrapper.append(canvasDOM);
  25         this.d = this.wrapper.children(0);
  26         this.setupEventHandling();
  27     },
  28
  29     generateCanvasDOM: function(wlxmlNode) {
  30         // var element = this.createNodeElement2({
  31         //     tag: wlxmlNode.getTagName(),
  32         //     klass: wlxmlNode.getClass(), //currentTag.attr('class'),
  33         //     meta: wlxmlNode.getMetaAttributes(), //meta,
  34         //     others: wlxmlNode.getOtherAttributes(), // ~ //others,
  35         //     rawChildren: wlxmlNode.contents(),
  36         //     prepopulateOnEmpty: true
  37         // }); //->create2
  38
  39         var element = documentElement.DocumentNodeElement.create(wlxmlNode, this);
  40
  41
  42         ['orig-before', 'orig-after', 'orig-begin', 'orig-end'].forEach(function(attr) {
  43             element.data(attr, '');
  44         });
  45         return element.dom();
  46     },
  47
  48     setupEventHandling: function() {
  49         var canvas = this;
  50         this.wrapper.on('keyup keydown keypress', function(e) {
  51             keyboard.handleKey(e, this);
  52         }.bind(this));
  53
  54         this.wrapper.on('click', '[document-node-element], [document-text-element]', function(e) {
  55             e.stopPropagation();
  56             canvas.setCurrentElement(canvas.getDocumentElement(e.currentTarget), {caretTo: false});
  57         });
  58
  59         var observer = new MutationObserver(function(mutations) {
  60             mutations.forEach(function(mutation) {
  61                 if(documentElement.DocumentTextElement.isContentContainer(mutation.target)) {
  62                     observer.disconnect();
  63                     if(mutation.target.data === '')
  64                         mutation.target.data = utils.unicode.ZWS;
  65                     else if(mutation.oldValue === utils.unicode.ZWS) {
  66                         mutation.target.data = mutation.target.data.replace(utils.unicode.ZWS, '');
  67                         canvas._moveCaretToTextElement(canvas.getDocumentElement(mutation.target), 'end');
  68                     }
  69                     observer.observe(canvas.d[0], config);
  70                     canvas.publisher('contentChanged');
  71                 }
  72             });
  73         });
  74         var config = { attributes: false, childList: false, characterData: true, subtree: true, characterDataOldValue: true};
  75         observer.observe(this.d[0], config);
  76
  77
  78         this.wrapper.on('mouseover', '[document-node-element], [document-text-element]', function(e) {
  79             var el = canvas.getDocumentElement(e.currentTarget);
  80             if(!el)
  81                 return;
  82             e.stopPropagation();
  83             if(el instanceof documentElement.DocumentTextElement)
  84                 el = el.parent();
  85             el.toggleLabel(true);
  86         });
  87         this.wrapper.on('mouseout', '[document-node-element], [document-text-element]', function(e) {
  88             var el = canvas.getDocumentElement(e.currentTarget);
  89             if(!el)
  90                 return;
  91             e.stopPropagation();
  92             if(el instanceof documentElement.DocumentTextElement)
  93                 el = el.parent();
  94             el.toggleLabel(false);
  95         });
  96
  97         this.eventBus.on('elementToggled', function(toggle, element) {
  98             if(!toggle) {
  99                 canvas.setCurrentElement(element.getPreviousTextElement());
 100             }
 101         });
 102     },
 103
 104     view: function() {
 105         return this.wrapper;
 106     },
 107
 108     doc: function() {
 109         if(this.d === null)
 110             return null;
 111         return documentElement.DocumentNodeElement.fromHTMLElement(this.d.get(0), this); //{wlxmlTag: this.d.prop('tagName')};
 112     },
 113
 114     createNodeElement: function(params) {
 115         return documentElement.DocumentNodeElement.create(params, this);
 116     },
 117
 118     wrapText: function(params) {
 119         params = _.extend({textNodeIdx: 0}, params);
 120         if(typeof params.textNodeIdx === 'number')
 121             params.textNodeIdx = [params.textNodeIdx];
 122
 123         var childrenInside = params.inside.children(),
 124             idx1 = Math.min.apply(Math, params.textNodeIdx),
 125             idx2 = Math.max.apply(Math, params.textNodeIdx),
 126             textNode1 = childrenInside[idx1],
 127             textNode2 = childrenInside[idx2],
 128             sameNode = textNode1.sameNode(textNode2),
 129             prefixOutside = textNode1.getText().substr(0, params.offsetStart),
 130             prefixInside = textNode1.getText().substr(params.offsetStart),
 131             suffixInside = textNode2.getText().substr(0, params.offsetEnd),
 132             suffixOutside = textNode2.getText().substr(params.offsetEnd)
 133         ;
 134
 135         var wrapperElement = this.createNodeElement({tag: params._with.tag, klass: params._with.klass});
 136         textNode1.after(wrapperElement);
 137         textNode1.detach();
 138
 139         if(prefixOutside.length > 0)
 140             wrapperElement.before({text:prefixOutside});
 141         if(sameNode) {
 142             var core = textNode1.getText().substr(params.offsetStart, params.offsetEnd - params.offsetStart);
 143             wrapperElement.append({text: core});
 144         } else {
 145             textNode2.detach();
 146             if(prefixInside.length > 0)
 147                 wrapperElement.append({text: prefixInside});
 148             for(var i = idx1 + 1; i < idx2; i++) {
 149                 wrapperElement.append(childrenInside[i]);
 150             }
 151             if(suffixInside.length > 0)
 152                 wrapperElement.append({text: suffixInside});
 153         }
 154         if(suffixOutside.length > 0)
 155             wrapperElement.after({text: suffixOutside});
 156         return wrapperElement;
 157     },
 158
 159     wrapElements: function(params) {
 160         if(!(params.element1.parent().sameNode(params.element2.parent())))
 161             return;
 162
 163         var parent = params.element1.parent(),
 164             parentChildren = parent.children(),
 165             wrapper = this.createNodeElement({
 166                 tag: params._with.tag,
 167                 klass: params._with.klass}),
 168             idx1 = parent.childIndex(params.element1),
 169             idx2 = parent.childIndex(params.element2);
 170
 171         if(idx1 > idx2) {
 172             var tmp = idx1;
 173             idx1 = idx2;
 174             idx2 = tmp;
 175         }
 176
 177         var insertingMethod, insertingTarget;
 178         if(idx1 === 0) {
 179             insertingMethod = 'prepend';
 180             insertingTarget = parent;
 181         } else {
 182             insertingMethod = 'after';
 183             insertingTarget = parentChildren[idx1-1];
 184         }
 185
 186         for(var i = idx1; i <= idx2; i++) {
 187             wrapper.append(parentChildren[i].detach());
 188         }
 189
 190         insertingTarget[insertingMethod](wrapper);
 191         return wrapper;
 192     },
 193
 194     getSiblingParents: function(params) {
 195         var parents1 = [params.element1].concat(params.element1.parents()).reverse(),
 196             parents2 = [params.element2].concat(params.element2.parents()).reverse(),
 197             noSiblingParents = null;
 198
 199         if(parents1.length === 0 || parents2.length === 0 || !(parents1[0].sameNode(parents2[0])))
 200             return noSiblingParents;
 201
 202         var i;
 203         for(i = 0; i < Math.min(parents1.length, parents2.length); i++) {
 204             if(parents1[i].sameNode(parents2[i]))
 205                 continue;
 206             break;
 207         }
 208         return {element1: parents1[i], element2: parents2[i]};
 209     },
 210
 211     getDocumentElement: function(from) {
 212         if(from instanceof HTMLElement || from instanceof Text) {
 213            return documentElement.DocumentElement.fromHTMLElement(from, this);
 214         }
 215     },
 216     getCursor: function() {
 217         return new Cursor(this);
 218     },
 219
 220     list: {},
 221
 222
 223     getCurrentNodeElement: function() {
 224         return this.getDocumentElement(this.wrapper.find('.current-node-element').parent()[0]);
 225     },
 226
 227     getCurrentTextElement: function() {
 228         return this.getDocumentElement(this.wrapper.find('.current-text-element')[0]);
 229     },
 230
 231
 232
 233     setCurrentElement: function(element, params) {
 234         params = _.extend({caretTo: 'end'}, params);
 235         var findFirstDirectTextChild = function(e, nodeToLand) {
 236             var byBrowser = this.getCursor().getPosition().element;
 237             if(byBrowser && byBrowser.parent().sameNode(nodeToLand))
 238                 return byBrowser;
 239             var children = e.children();
 240             for(var i = 0; i < children.length; i++) {
 241                 if(children[i] instanceof documentElement.DocumentTextElement)
 242                     return children[i];
 243             }
 244             return null;
 245         }.bind(this);
 246         var _markAsCurrent = function(element) {
 247             if(element instanceof documentElement.DocumentTextElement) {
 248                 this.wrapper.find('.current-text-element').removeClass('current-text-element');
 249                 element.dom().addClass('current-text-element');
 250             } else {
 251                 this.wrapper.find('.current-node-element').removeClass('current-node-element')
 252                 element._container().addClass('current-node-element');
 253                 this.publisher('currentElementChanged', element);
 254             }
 255         }.bind(this);
 256
 257
 258         var isTextElement = element instanceof documentElement.DocumentTextElement,
 259             nodeElementToLand = isTextElement ? element.parent() : element,
 260             textElementToLand = isTextElement ? element : findFirstDirectTextChild(element, nodeElementToLand),
 261             currentTextElement = this.getCurrentTextElement(),
 262             currentNodeElement = this.getCurrentNodeElement();
 263
 264         if(currentTextElement && !(currentTextElement.sameNode(textElementToLand)))
 265             this.wrapper.find('.current-text-element').removeClass('current-text-element');
 266
 267         if(textElementToLand) {
 268             _markAsCurrent(textElementToLand);
 269             if(params.caretTo || !textElementToLand.sameNode(this.getCursor().getPosition().element))
 270                 this._moveCaretToTextElement(textElementToLand, params.caretTo); // as method on element?
 271             if(!(textElementToLand.sameNode(currentTextElement)))
 272                 this.publisher('currentTextElementSet', textElementToLand);
 273         } else {
 274             document.getSelection().removeAllRanges();
 275         }
 276
 277         if(!(currentNodeElement && currentNodeElement.sameNode(nodeElementToLand))) {
 278             _markAsCurrent(nodeElementToLand);
 279
 280             this.publisher('currentNodeElementSet', nodeElementToLand);
 281         }
 282     },
 283
 284     _moveCaretToTextElement: function(element, where) {
 285         var range = document.createRange(),
 286             node = element.dom().contents()[0];
 287
 288         if(typeof where !== 'number') {
 289             range.selectNodeContents(node);
 290         } else {
 291             range.setStart(node, where);
 292         }
 293
 294         var collapseArg = true;
 295         if(where === 'end')
 296             collapseArg = false;
 297         range.collapse(collapseArg);
 298
 299         var selection = document.getSelection();
 300
 301         selection.removeAllRanges();
 302         selection.addRange(range);
 303         this.wrapper.focus(); // FF requires this for caret to be put where range colllapses, Chrome doesn't.
 304     },
 305
 306     setCursorPosition: function(position) {
 307         if(position.element)
 308             this._moveCaretToTextElement(position.element, position.offset);
 309     },
 310
 311     toXML: function() {
 312         var parent = $('<div>'),
 313             parts = this.doc().toXML(0);
 314         parent.append(parts);
 315         return parent.html();
 316     }
 317 });
 318
 319 $.extend(Canvas.prototype.list, {
 320     create: function(params) {
 321         if(!(params.element1.parent().sameNode(params.element2.parent())))
 322             return false;
 323
 324         var parent = params.element1.parent(),
 325             canvas = params.element1.canvas;
 326
 327         if(parent.childIndex(params.element1) > parent.childIndex(params.element2)) {
 328             var tmp = params.element1;
 329             params.element1 = params.element2;
 330             params.element2 = tmp;
 331         }
 332
 333         var elementsToWrap = [];
 334
 335         var place = 'before';
 336         parent.children().some(function(element) {
 337             var _e = element;
 338             if(element.sameNode(params.element1))
 339                 place = 'inside';
 340             if(place === 'inside') {
 341                 if(element instanceof documentElement.DocumentTextElement) {
 342                     element = element.wrapWithNodeElement({tag: 'div', klass: 'list.item'});
 343                     if(element.children()[0].sameNode(params.element1))
 344                         params.element1 = element;
 345                 }
 346                 element.setWlxmlClass('item');
 347                 elementsToWrap.push(element);
 348             }
 349             if(_e.sameNode(params.element2))
 350                 return true;
 351         });
 352
 353         var listElement = canvas.createNodeElement({tag: 'div', klass: 'list-items' + (params.type === 'enum' ? '-enum' : '')});
 354         var toret;
 355         if(parent.is('list')) {
 356             var item = listElement.wrapWithNodeElement({tag: 'div', klass: 'item'});
 357             item.exec('toggleBullet', false);
 358             toret = listElement.parent();
 359         } else {
 360             toret = listElement;
 361         }
 362
 363         params.element1.before(toret);
 364
 365         elementsToWrap.forEach(function(element) {
 366             element.detach();
 367             listElement.append(element);
 368         });
 369     },
 370     extractItems: function(params) {
 371         params = _.extend({merge: true}, params);
 372         var list = params.element1.parent();
 373         if(!list.is('list') || !(list.sameNode(params.element2.parent())))
 374             return false;
 375
 376         var idx1 = list.childIndex(params.element1),
 377             idx2 = list.childIndex(params.element2),
 378             precedingItems = [],
 379             extractedItems = [],
 380             succeedingItems = [],
 381             items = list.children(),
 382             listIsNested = list.parent().getWlxmlClass() === 'item',
 383             canvas = params.element1.canvas,
 384             i;
 385
 386         if(idx1 > idx2) {
 387             var tmp = idx1; idx1 = idx2; idx2 = tmp;
 388         }
 389
 390         items.forEach(function(item, idx) {
 391             if(idx < idx1)
 392                 precedingItems.push(item);
 393             else if(idx >= idx1 && idx <= idx2) {
 394                 extractedItems.push(item);
 395             }
 396             else {
 397                 succeedingItems.push(item);
 398             }
 399         });
 400
 401         var reference = listIsNested ? list.parent() : list;
 402         if(succeedingItems.length === 0) {
 403             var reference_orig = reference;
 404             extractedItems.forEach(function(item) {
 405                 reference.after(item);
 406                 reference = item;
 407                 if(!listIsNested)
 408                     item.setWlxmlClass(null);
 409             });
 410             if(precedingItems.length === 0)
 411                 reference_orig.detach();
 412         } else if(precedingItems.length === 0) {
 413             extractedItems.forEach(function(item) {
 414                 reference.before(item);
 415                 if(!listIsNested)
 416                     item.setWlxmlClass(null);
 417             });
 418         } else {
 419             extractedItems.forEach(function(item) {
 420                 reference.after(item);
 421                 if(!listIsNested)
 422                     item.setWlxmlClass(null);
 423                 reference = item;
 424             });
 425             var secondList = canvas.createNodeElement({tag: 'div', klass:'list-items'}),
 426                 toAdd = secondList;
 427
 428             if(listIsNested) {
 429                 toAdd = secondList.wrapWithNodeElement({tag: 'div', klass:'item'});
 430             }
 431             succeedingItems.forEach(function(item) {
 432                 secondList.append(item);
 433             });
 434
 435             reference.after(toAdd);
 436         }
 437         if(!params.merge && listIsNested) {
 438             return this.extractItems({element1: extractedItems[0], element2: extractedItems[extractedItems.length-1]});
 439         }
 440         return true;
 441     },
 442     areItemsOfTheSameList: function(params) {
 443         var e1 = params.element1,
 444             e2 = params.element2;
 445         return e1.parent().sameNode(e2.parent())
 446             && e1.parent().is('list');
 447     }
 448 });
 449
 450
 451 var Cursor = function(canvas) {
 452     this.canvas = canvas;
 453 };
 454
 455 $.extend(Cursor.prototype, {
 456     isSelecting: function() {
 457         var selection = window.getSelection();
 458         return !selection.isCollapsed;
 459     },
 460     isSelectingWithinElement: function() {
 461         return this.isSelecting() && this.getSelectionStart().element.sameNode(this.getSelectionEnd().element);
 462     },
 463     isSelectingSiblings: function() {
 464         return this.isSelecting() && this.getSelectionStart().element.parent().sameNode(this.getSelectionEnd().element.parent());
 465     },
 466     getPosition: function() {
 467         return this.getSelectionAnchor();
 468     },
 469     getSelectionStart: function() {
 470         return this.getSelectionBoundry('start');
 471     },
 472     getSelectionEnd: function() {
 473         return this.getSelectionBoundry('end');
 474     },
 475     getSelectionAnchor: function() {
 476         return this.getSelectionBoundry('anchor');
 477     },
 478     getSelectionFocus: function() {
 479         return this.getSelectionBoundry('focus');
 480     },
 481     getSelectionBoundry: function(which) {
 482         var selection = window.getSelection(),
 483             anchorElement = this.canvas.getDocumentElement(selection.anchorNode),
 484             focusElement = this.canvas.getDocumentElement(selection.focusNode);
 485
 486         if((!anchorElement) || (anchorElement instanceof documentElement.DocumentNodeElement) || (!focusElement) || focusElement instanceof documentElement.DocumentNodeElement)
 487             return {};
 488
 489         if(which === 'anchor') {
 490             return {
 491                 element: anchorElement,
 492                 offset: selection.anchorOffset,
 493                 offsetAtBeginning: selection.anchorOffset === 0,
 494                 offsetAtEnd: selection.anchorNode.data.length === selection.anchorOffset
 495             };
 496         }
 497         if(which === 'focus') {
 498             return {
 499                 element: focusElement,
 500                 offset: selection.focusOffset,
 501                 offsetAtBeginning: selection.focusOffset === 0,
 502                 offsetAtEnd: selection.focusNode.data.length === selection.focusOffset
 503             };
 504         }
 505
 506         var element,
 507             offset;
 508
 509         if(anchorElement.parent().sameNode(focusElement.parent())) {
 510             var parent = anchorElement.parent(),
 511                 anchorFirst = parent.childIndex(anchorElement) < parent.childIndex(focusElement);
 512             if(anchorFirst) {
 513                 if(which === 'start') {
 514                     element = anchorElement;
 515                     offset = selection.anchorOffset
 516                 }
 517                 else if(which === 'end') {
 518                     element = focusElement,
 519                     offset = selection.focusOffset
 520                 }
 521             } else {
 522                 if(which === 'start') {
 523                     element = focusElement,
 524                     offset = selection.focusOffset
 525                 }
 526                 else if(which === 'end') {
 527                     element = anchorElement;
 528                     offset = selection.anchorOffset
 529                 }
 530             }
 531         } else {
 532             // TODO: Handle order via https://developer.mozilla.org/en-US/docs/Web/API/Node.compareDocumentPosition
 533             if(which === 'start') {
 534                 element = anchorElement;
 535                 offset = selection.anchorOffset
 536             } else {
 537                 element = focusElement;
 538                 offset = selection.focusOffset
 539             }
 540         }
 541
 542         var nodeLen = (element.sameNode(focusElement) ? selection.focusNode : selection.anchorNode).length;
 543         return {
 544             element: element,
 545             offset: offset,
 546             offsetAtBeginning: offset === 0,
 547             offsetAtEnd: nodeLen === offset
 548         }
 549     }
 550 })
 551
 552 return {
 553     fromXML: function(wlxmlNode, publisher) {
 554         return new Canvas(wlxmlNode, publisher);
 555     }
 556 };
 557
 558 });