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