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

   1 define([
   2 'libs/jquery',
   3 'libs/underscore',
   4 'libs/backbone',
   5 'fnpjs/logging/logging',
   6 'modules/documentCanvas/canvas/documentElement',
   7 'modules/documentCanvas/canvas/keyboard',
   8 'modules/documentCanvas/canvas/utils',
   9 'modules/documentCanvas/canvas/wlxmlListener',
  10 'modules/documentCanvas/canvas/elementsRegister',
  11 'modules/documentCanvas/canvas/genericElement',
  12 'modules/documentCanvas/canvas/nullElement',
  13 'modules/documentCanvas/canvas/gutter',
  14 'libs/text!./canvas.html'
  15 ], function($, _, Backbone, logging, documentElement, keyboard, utils, wlxmlListener, ElementsRegister, genericElement, nullElement, gutter, canvasTemplate) {
  16
  17 'use strict';
  18 /* global document:false, window:false, Node:false, gettext */
  19
  20 var logger = logging.getLogger('canvas');
  21
  22 var TextHandler = function(canvas) {this.canvas = canvas; this.buffer = null;};
  23 $.extend(TextHandler.prototype, {
  24     handle: function(node, text) {
  25         this.setText(text, node);
  26         // return;
  27         // if(!this.node) {
  28         //     this.node = node;
  29         // }
  30         // if(this.node.sameNode(node)) {
  31         //     this._ping(text);
  32         // } else {
  33         //     this.flush();
  34         //     this.node = node;
  35         //     this._ping(text);
  36         // }
  37     },
  38     _ping: _.throttle(function(text) {
  39         this.buffer = text;
  40         this.flush();
  41     }, 1000),
  42     flush: function() {
  43         if(this.buffer !== null) {
  44             this.setText(this.buffer, this.node);
  45             this.buffer = null;
  46         }
  47     },
  48     setText: function(text, node) {
  49         //this.canvas.wlxmlDocument.transform('setText', {node:node, text: text});
  50         node.document.transaction(function() {
  51             node.setText(text);
  52         }, {
  53             metadata:{
  54                 description: gettext('Changing text')
  55             }
  56         });
  57
  58     }
  59
  60 });
  61
  62
  63 var Canvas = function(wlxmlDocument, elements, metadata) {
  64     this.metadata = metadata || {};
  65     this.elementsRegister = new ElementsRegister(documentElement.DocumentNodeElement, nullElement);
  66
  67     elements = [
  68         {tag: 'section', klass: null, prototype: genericElement},
  69         {tag: 'div', klass: null, prototype: genericElement},
  70         {tag: 'header', klass: null, prototype: genericElement},
  71         {tag: 'span', klass: null, prototype: genericElement},
  72         {tag: 'aside', klass: null, prototype: genericElement}
  73     ].concat(elements || []);
  74
  75     (elements).forEach(function(elementDesc) {
  76         this.elementsRegister.register(elementDesc);
  77     }.bind(this));
  78     this.eventBus = _.extend({}, Backbone.Events);
  79
  80     this.dom = $(canvasTemplate);
  81     this.rootWrapper = this.dom.find('.root-wrapper');
  82
  83
  84     this.gutter = gutter.create();
  85     this.gutterView = new gutter.GutterView(this.gutter);
  86     this.dom.find('.view-row').append(this.gutterView.dom);
  87
  88     this.wlxmlListener = wlxmlListener.create(this);
  89     this.loadWlxmlDocument(wlxmlDocument);
  90     this.setupEventHandling();
  91     this.textHandler = new TextHandler(this);
  92 };
  93
  94 $.extend(Canvas.prototype, Backbone.Events, {
  95
  96     getElementOffset: function(element) {
  97         return element.dom.offset().top - this.dom.offset().top;
  98     },
  99
 100     loadWlxmlDocument: function(wlxmlDocument) {
 101         if(!wlxmlDocument) {
 102             return false;
 103         }
 104
 105         this.wlxmlListener.listenTo(wlxmlDocument);
 106         this.wlxmlDocument = wlxmlDocument;
 107         this.reloadRoot();
 108     },
 109
 110     createElement: function(wlxmlNode) {
 111         var Factory;
 112         if(wlxmlNode.nodeType === Node.TEXT_NODE) {
 113             Factory = documentElement.DocumentTextElement;
 114         } else {
 115             Factory = this.elementsRegister.getElement({tag: wlxmlNode.getTagName(), klass: wlxmlNode.getClass()});
 116         }
 117         return new Factory(wlxmlNode, this);
 118     },
 119
 120     getDocumentElement: function(htmlElement) {
 121         /* globals HTMLElement, Text */
 122         if(!htmlElement || !(htmlElement instanceof HTMLElement || htmlElement instanceof Text)) {
 123             return null;
 124         }
 125         var $element = $(htmlElement);
 126         if(htmlElement.nodeType === Node.ELEMENT_NODE && $element.attr('document-node-element') !== undefined) {
 127             return $element.data('canvas-element');
 128         }
 129
 130         if(htmlElement.nodeType === Node.TEXT_NODE && $element.parent().attr('document-text-element') !== undefined) {
 131             $element = $element.parent();
 132         }
 133
 134         if($element.attr('document-text-element') !== undefined || (htmlElement.nodeType === Node.TEXT_NODE && $element.parent().attr('document-text-element') !== undefined)) {
 135             //return DocumentTextElement.fromHTMLElement(htmlElement, canvas);
 136             return $element.data('canvas-element');
 137         }
 138     },
 139
 140     reloadRoot: function() {
 141         if(this.rootElement) {
 142             this.rootElement.detach();
 143         }
 144         this.rootElement = this.createElement(this.wlxmlDocument.root);
 145         this.rootWrapper.append(this.rootElement.dom);
 146     },
 147
 148     setupEventHandling: function() {
 149         var canvas = this;
 150
 151         this.rootWrapper.on('keyup keydown keypress', function(e) {
 152             keyboard.handleKey(e, canvas);
 153         });
 154
 155         this.rootWrapper.on('mouseup', function() {
 156             canvas.triggerSelectionChanged();
 157         });
 158
 159         var mouseDown;
 160         this.rootWrapper.on('mousedown', '[document-node-element], [document-text-element]', function(e) {
 161             mouseDown = e.target;
 162         });
 163
 164         this.rootWrapper.on('click', '[document-node-element], [document-text-element]', function(e) {
 165             e.stopPropagation();
 166             if(e.originalEvent.detail === 3) {
 167                 e.preventDefault();
 168                 canvas._moveCaretToTextElement(canvas.getDocumentElement(e.currentTarget), 'whole');
 169             } else {
 170                 if(mouseDown === e.target) {
 171                     canvas.setCurrentElement(canvas.getDocumentElement(e.currentTarget), {caretTo: false});
 172                 }
 173             }
 174         });
 175
 176         this.rootWrapper.on('paste', function(e) {
 177             e.preventDefault();
 178
 179             var clipboardData = e.originalEvent.clipboardData;
 180             if(!clipboardData || !clipboardData.getData) {
 181                 return; // TODO: alert
 182             }
 183
 184             var text = clipboardData.getData('text/plain').replace(/\r?\n|\r/g, ' '),
 185                 cursor = canvas.getCursor(),
 186                 element = cursor.getPosition().element,
 187                 lhs, rhs;
 188
 189             if(element && cursor.isWithinElement()) {
 190                 lhs = element.getText().substr(0, cursor.getSelectionStart().offset);
 191                 rhs = element.getText().substr(cursor.getSelectionEnd().offset);
 192                 element.setText(lhs+text+rhs);
 193                 canvas.setCurrentElement(element, {caretTo: lhs.length + text.length});
 194             } else {
 195                 /* jshint noempty:false */
 196                 // TODO: alert
 197             }
 198         });
 199
 200         /* globals MutationObserver */
 201         var observer = new MutationObserver(function(mutations) {
 202             mutations.forEach(function(mutation) {
 203                 if(canvas.dom[0].contains(mutation.target) && documentElement.DocumentTextElement.isContentContainer(mutation.target)) {
 204                     observer.disconnect();
 205                     if(mutation.target.data === '') {
 206                         mutation.target.data = utils.unicode.ZWS;
 207                     }
 208                     else if(mutation.oldValue === utils.unicode.ZWS) {
 209                         mutation.target.data = mutation.target.data.replace(utils.unicode.ZWS, '');
 210                         canvas._moveCaretToTextElement(canvas.getDocumentElement(mutation.target), 'end');
 211                     }
 212                     observer.observe(canvas.dom[0], config);
 213
 214                     var textElement = canvas.getDocumentElement(mutation.target),
 215                         toSet = mutation.target.data !== utils.unicode.ZWS ? mutation.target.data : '';
 216
 217                     //textElement.data('wlxmlNode').setText(toSet);
 218                     //textElement.data('wlxmlNode').document.transform('setText', {node: textElement.data('wlxmlNode'), text: toSet});
 219                     if(textElement.wlxmlNode.getText() !== toSet) {
 220                         canvas.textHandler.handle(textElement.wlxmlNode, toSet);
 221                     }
 222                 }
 223             });
 224         });
 225         var config = { attributes: false, childList: false, characterData: true, subtree: true, characterDataOldValue: true};
 226         observer.observe(this.rootWrapper[0], config);
 227
 228
 229         var hoverHandler = function(e) {
 230             var el = canvas.getDocumentElement(e.currentTarget),
 231                 expose = {
 232                     mouseover: true,
 233                     mouseout: false
 234                 };
 235             if(!el) {
 236                 return;
 237             }
 238             e.stopPropagation();
 239             if(el instanceof documentElement.DocumentTextElement) {
 240                 el = el.parent();
 241             }
 242             el.updateState({exposed:expose[e.type]});
 243         };
 244
 245         this.rootWrapper.on('mouseover', '[document-node-element], [document-text-element]', hoverHandler);
 246         this.rootWrapper.on('mouseout', '[document-node-element], [document-text-element]', hoverHandler);
 247
 248         this.eventBus.on('elementToggled', function(toggle, element) {
 249             if(!toggle) {
 250                 canvas.setCurrentElement(canvas.getPreviousTextElement(element));
 251             }
 252         });
 253     },
 254
 255     view: function() {
 256         return this.dom;
 257     },
 258
 259     doc: function() {
 260         return this.rootElement;
 261     },
 262
 263     toggleElementHighlight: function(node, toggle) {
 264         var element = utils.getElementForNode(node);
 265         element.updateState({exposed: toggle});
 266     },
 267
 268     getCursor: function() {
 269         return new Cursor(this);
 270     },
 271
 272
 273     getCurrentNodeElement: function() {
 274         return this.currentNodeElement;
 275     },
 276
 277     getCurrentTextElement: function() {
 278         var htmlElement = this.rootWrapper.find('.current-text-element')[0];
 279         if(htmlElement) {
 280             return this.getDocumentElement(htmlElement);
 281         }
 282     },
 283
 284     getPreviousTextElement: function(relativeToElement, includeInvisible) {
 285         return this.getNearestTextElement('above', relativeToElement, includeInvisible);
 286     },
 287
 288     getNextTextElement: function(relativeToElement, includeInvisible) {
 289         return this.getNearestTextElement('below', relativeToElement, includeInvisible);
 290     },
 291
 292     getNearestTextElement: function(direction, relativeToElement, includeInvisible) {
 293         includeInvisible = includeInvisible !== undefined ? includeInvisible : false;
 294         var selector = '[document-text-element]' + (includeInvisible ? '' : ':visible');
 295         return this.getDocumentElement(utils.nearestInDocumentOrder(selector, direction, relativeToElement.dom[0]));
 296     },
 297
 298     contains: function(element) {
 299         return element && element.dom && element.dom.parents().index(this.rootWrapper) !== -1;
 300     },
 301
 302     triggerSelectionChanged: function() {
 303         this.trigger('selectionChanged', this.getSelection());
 304         var s = this.getSelection(),
 305             f = s.toDocumentFragment();
 306         if(f && f instanceof f.RangeFragment) {
 307             if(this.currentNodeElement) {
 308                 this.currentNodeElement.updateState({active: false});
 309                 this.currentNodeElement = null;
 310             }
 311         }
 312     },
 313
 314     getSelection: function() {
 315         return new Selection(this);
 316     },
 317
 318     select: function(fragment) {
 319         if(fragment instanceof this.wlxmlDocument.RangeFragment) {
 320             this.setCurrentElement(fragment.endNode, {caretTo: fragment.endOffset});
 321         } else if(fragment instanceof this.wlxmlDocument.NodeFragment) {
 322             var params = {
 323                 caretTo: fragment instanceof this.wlxmlDocument.CaretFragment ? fragment.offset : 'start'
 324             };
 325             this.setCurrentElement(fragment.node, params);
 326         } else {
 327             logger.debug('Fragment not supported');
 328         }
 329     },
 330
 331     setCurrentElement: function(element, params) {
 332         if(!element) {
 333             logger.debug('Invalid element passed to setCurrentElement: ' + element);
 334             return;
 335         }
 336
 337         if(!(element instanceof documentElement.DocumentElement)) {
 338             element = utils.getElementForNode(element);
 339         }
 340
 341         if(!element || !this.contains(element)) {
 342             logger.warning('Cannot set current element: element doesn\'t exist on canvas');
 343             return;
 344         }
 345
 346         params = _.extend({caretTo: 'end'}, params);
 347         var findFirstDirectTextChild = function(e, nodeToLand) {
 348             var byBrowser = this.getCursor().getPosition().element;
 349             if(byBrowser && byBrowser.parent().sameNode(nodeToLand)) {
 350                 return byBrowser;
 351             }
 352             return _.isFunction(e.getVerticallyFirstTextElement) ? e.getVerticallyFirstTextElement({considerChildren: false}) : null;
 353         }.bind(this);
 354         var _markAsCurrent = function(element) {
 355             if(element instanceof documentElement.DocumentTextElement) {
 356                 this.rootWrapper.find('.current-text-element').removeClass('current-text-element');
 357                 element.dom.addClass('current-text-element');
 358             } else {
 359                 if(this.currentNodeElement) {
 360                     this.currentNodeElement.updateState({active: false});
 361                 }
 362                 element.updateState({active: true});
 363                 this.currentNodeElement = element;
 364             }
 365         }.bind(this);
 366
 367
 368         var isTextElement = element instanceof documentElement.DocumentTextElement,
 369             nodeElementToLand = isTextElement ? element.parent() : element,
 370             textElementToLand = isTextElement ? element : findFirstDirectTextChild(element, nodeElementToLand),
 371             currentTextElement = this.getCurrentTextElement(),
 372             currentNodeElement = this.getCurrentNodeElement();
 373
 374         if(currentTextElement && !(currentTextElement.sameNode(textElementToLand))) {
 375             this.rootWrapper.find('.current-text-element').removeClass('current-text-element');
 376         }
 377
 378         if(textElementToLand) {
 379             _markAsCurrent(textElementToLand);
 380             if(params.caretTo || !textElementToLand.sameNode(this.getCursor().getPosition().element)) {
 381                 this._moveCaretToTextElement(textElementToLand, params.caretTo); // as method on element?
 382             }
 383         } else {
 384             document.getSelection().removeAllRanges();
 385         }
 386
 387         if(!(currentNodeElement && currentNodeElement.sameNode(nodeElementToLand))) {
 388             _markAsCurrent(nodeElementToLand);
 389         }
 390         this.triggerSelectionChanged();
 391     },
 392
 393     _moveCaretToTextElement: function(element, where) {
 394         var range = document.createRange(),
 395             node = element.dom.contents()[0];
 396
 397         if(typeof where !== 'number') {
 398             range.selectNodeContents(node);
 399         } else {
 400             range.setStart(node, Math.min(node.data.length, where));
 401         }
 402
 403         if(where !== 'whole') {
 404             var collapseArg = true;
 405             if(where === 'end') {
 406                 collapseArg = false;
 407             }
 408             range.collapse(collapseArg);
 409         }
 410         var selection = document.getSelection();
 411
 412         selection.removeAllRanges();
 413         selection.addRange(range);
 414         this.rootWrapper.focus(); // FF requires this for caret to be put where range colllapses, Chrome doesn't.
 415     },
 416
 417     setCursorPosition: function(position) {
 418         if(position.element) {
 419             this._moveCaretToTextElement(position.element, position.offset);
 420         }
 421     }
 422 });
 423
 424
 425 var isText = function(node) {
 426     return node && node.nodeType === Node.TEXT_NODE && $(node.parentNode).is('[document-text-element]');
 427 };
 428
 429 var Selection = function(canvas) {
 430     this.canvas = canvas;
 431     var nativeSelection = this.nativeSelection = window.getSelection();
 432     Object.defineProperty(this, 'type', {
 433         get: function() {
 434             if(nativeSelection.focusNode) {
 435                 if(nativeSelection.isCollapsed && isText(nativeSelection.focusNode)) {
 436                     return 'caret';
 437                 }
 438                 if(isText(nativeSelection.focusNode) && isText(nativeSelection.anchorNode)) {
 439                     return 'textSelection';
 440                 }
 441             }
 442             if(canvas.getCurrentNodeElement()) {
 443                 return 'node';
 444             }
 445         }
 446     });
 447 };
 448
 449 $.extend(Selection.prototype, {
 450     toDocumentFragment: function() {
 451         var doc = this.canvas.wlxmlDocument,
 452             anchorElement = this.canvas.getDocumentElement(this.nativeSelection.anchorNode),
 453             focusElement = this.canvas.getDocumentElement(this.nativeSelection.focusNode),
 454             anchorNode = anchorElement ? anchorElement.wlxmlNode : null,
 455             focusNode = focusElement ? focusElement.wlxmlNode : null;
 456         if(this.type === 'caret') {
 457             return doc.createFragment(doc.CaretFragment, {node: anchorNode, offset: this.nativeSelection.anchorOffset});
 458         }
 459         if(this.type === 'textSelection') {
 460             if(!anchorNode || !focusNode) {
 461                 return;
 462             }
 463             if(anchorNode.isSiblingOf(focusNode)) {
 464                 return doc.createFragment(doc.TextRangeFragment, {
 465                     node1: anchorNode,
 466                     offset1: this.nativeSelection.anchorOffset,
 467                     node2: focusNode,
 468                     offset2: this.nativeSelection.focusOffset,
 469                 });
 470             }
 471             else {
 472                 var siblingParents = doc.getSiblingParents({node1: anchorNode, node2: focusNode});
 473                 return doc.createFragment(doc.RangeFragment, {
 474                     node1: siblingParents.node1,
 475                     node2: siblingParents.node2
 476                 });
 477             }
 478         }
 479         if(this.type === 'node') {
 480             return doc.createFragment(doc.NodeFragment, {node: this.canvas.getCurrentNodeElement().wlxmlNode});
 481         }
 482     },
 483     sameAs: function(other) {
 484         void(other);
 485     }
 486 });
 487
 488 var Cursor = function(canvas) {
 489     this.canvas = canvas;
 490     this.selection = window.getSelection();
 491 };
 492
 493 $.extend(Cursor.prototype, {
 494     sameAs: function(other) {
 495         var same = true;
 496         if(!other) {
 497             return false;
 498         }
 499
 500         ['focusNode', 'focusOffset', 'anchorNode', 'anchorOffset'].some(function(prop) {
 501             same = same && this.selection[prop] === other.selection[prop];
 502             if(!same) {
 503                 return true; // break
 504             }
 505         }.bind(this));
 506
 507         return same;
 508     },
 509     isSelecting: function() {
 510         var selection = window.getSelection();
 511         return !selection.isCollapsed;
 512     },
 513     isSelectingWithinElement: function() {
 514         return this.isSelecting() && this.getSelectionStart().element.sameNode(this.getSelectionEnd().element);
 515     },
 516     isWithinElement: function() {
 517         return !this.isSelecting() || this.isSelectingWithinElement();
 518     },
 519     isSelectingSiblings: function() {
 520         return this.isSelecting() && this.getSelectionStart().element.parent().sameNode(this.getSelectionEnd().element.parent());
 521     },
 522     getPosition: function() {
 523         return this.getSelectionAnchor();
 524     },
 525     getSelectionStart: function() {
 526         return this.getSelectionBoundry('start');
 527     },
 528     getSelectionEnd: function() {
 529         return this.getSelectionBoundry('end');
 530     },
 531     getSelectionAnchor: function() {
 532         return this.getSelectionBoundry('anchor');
 533     },
 534     getSelectionFocus: function() {
 535         return this.getSelectionBoundry('focus');
 536     },
 537     getSelectionBoundry: function(which) {
 538         /* globals window */
 539         var selection = window.getSelection(),
 540             anchorElement = this.canvas.getDocumentElement(selection.anchorNode),
 541             focusElement = this.canvas.getDocumentElement(selection.focusNode);
 542
 543         if((!anchorElement) || (anchorElement instanceof documentElement.DocumentNodeElement) || (!focusElement) || focusElement instanceof documentElement.DocumentNodeElement) {
 544             return {};
 545         }
 546
 547         if(which === 'anchor') {
 548             return {
 549                 element: anchorElement,
 550                 offset: selection.anchorOffset,
 551                 offsetAtBeginning: selection.anchorOffset === 0 || anchorElement.getText() === '',
 552                 offsetAtEnd: selection.anchorNode.data.length === selection.anchorOffset || anchorElement.getText() === ''
 553             };
 554         }
 555         if(which === 'focus') {
 556             return {
 557                 element: focusElement,
 558                 offset: selection.focusOffset,
 559                 offsetAtBeginning: selection.focusOffset === 0 || focusElement.getText() === '',
 560                 offsetAtEnd: selection.focusNode.data.length === selection.focusOffset || focusElement.getText() === '',
 561             };
 562         }
 563
 564         var getPlaceData = function(anchorFirst) {
 565             var element, offset;
 566             if(anchorFirst) {
 567                 if(which === 'start') {
 568                     element = anchorElement;
 569                     offset = selection.anchorOffset;
 570                 }
 571                 else if(which === 'end') {
 572                     element = focusElement;
 573                     offset = selection.focusOffset;
 574                 }
 575             } else {
 576                 if(which === 'start') {
 577                     element = focusElement;
 578                     offset = selection.focusOffset;
 579                 }
 580                 else if(which === 'end') {
 581                     element = anchorElement;
 582                     offset = selection.anchorOffset;
 583                 }
 584             }
 585             return {element: element, offset: offset};
 586         };
 587
 588         var anchorFirst, placeData, parent;
 589
 590         if(anchorElement.parent().sameNode(focusElement.parent())) {
 591             parent = anchorElement.parent();
 592             if(selection.anchorNode === selection.focusNode) {
 593                 anchorFirst = selection.anchorOffset <= selection.focusOffset;
 594             } else {
 595                 anchorFirst = (parent.getFirst(anchorElement, focusElement) === anchorElement);
 596             }
 597             placeData = getPlaceData(anchorFirst);
 598         } else {
 599             /*jshint bitwise: false*/
 600             anchorFirst = selection.anchorNode.compareDocumentPosition(selection.focusNode) & Node.DOCUMENT_POSITION_FOLLOWING;
 601             placeData = getPlaceData(anchorFirst);
 602         }
 603
 604         var nodeLen = (placeData.element.sameNode(focusElement) ? selection.focusNode : selection.anchorNode).length;
 605         return {
 606             element: placeData.element,
 607             offset: placeData.offset,
 608             offsetAtBeginning: placeData.offset === 0 || focusElement.getText() === '',
 609             offsetAtEnd: nodeLen === placeData.offset || focusElement.getText() === ''
 610         };
 611     }
 612 });
 613
 614 return {
 615     fromXMLDocument: function(wlxmlDocument, elements, metadata) {
 616         return new Canvas(wlxmlDocument, elements, metadata);
 617     }
 618 };
 619
 620 });