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 TextHandler = function(canvas) {this.canvas = canvas; this.buffer = null};
  14 $.extend(TextHandler.prototype, {
  15     handle: function(node, text) {
  16         //console.log('canvas text handler: ' + text);
  17         this.setText(text, node);
  18         return;
  19         if(!this.node) {
  20             this.node = node;
  21         }
  22         if(this.node.sameNode(node)) {
  23             this._ping(text);
  24         } else {
  25             this.flush();
  26             this.node = node;
  27             this._ping(text);
  28         }
  29     },
  30     _ping: _.throttle(function(text) {
  31         this.buffer = text;
  32         this.flush();
  33     }, 1000),
  34     flush: function() {
  35         if(this.buffer != null) {
  36             this.setText(this.buffer, this.node);
  37             this.buffer = null;
  38         }
  39     },
  40     setText: function(text, node) {
  41         //this.canvas.wlxmlDocument.transform('setText', {node:node, text: text});
  42         node.setText(text);
  43
  44     }
  45
  46 });
  47
  48
  49 var Canvas = function(wlxmlDocument, publisher) {
  50     this.eventBus = _.extend({}, Backbone.Events);
  51     this.wrapper = $('<div>').addClass('canvas-wrapper').attr('contenteditable', true);
  52     this.wlxmlListener = wlxmlListener.create(this);
  53     this.loadWlxmlDocument(wlxmlDocument);
  54     this.publisher = publisher ? publisher : function() {};
  55     this.textHandler = new TextHandler(this);
  56 };
  57
  58 $.extend(Canvas.prototype, {
  59
  60     loadWlxmlDocument: function(wlxmlDocument) {
  61         if(!wlxmlDocument) {
  62             return false;
  63         }
  64
  65         this.wlxmlListener.listenTo(wlxmlDocument);
  66         this.wlxmlDocument = wlxmlDocument;
  67         this.reloadRoot();
  68         this.setupEventHandling();
  69     },
  70
  71     reloadRoot: function() {
  72         var canvasDOM = this.generateCanvasDOM(this.wlxmlDocument.root);
  73         //var canvasDOM = this.wlxmlDocument.root.getData('canvasElement') ? this.wlxmlDocument.root.getData('canvasElement').dom() : this.generateCanvasDOM(this.wlxmlDocument.root);
  74
  75         this.wrapper.empty();
  76         this.wrapper.append(canvasDOM);
  77         this.d = this.wrapper.children(0);
  78     },
  79
  80     generateCanvasDOM: function(wlxmlNode) {
  81         var element = documentElement.DocumentNodeElement.create(wlxmlNode, this);
  82         return element.dom();
  83     },
  84
  85     setupEventHandling: function() {
  86         var canvas = this;
  87         this.wrapper.on('keyup keydown keypress', function(e) {
  88             keyboard.handleKey(e, this);
  89         }.bind(this));
  90
  91         this.wrapper.on('click', '[document-node-element], [document-text-element]', function(e) {
  92             e.stopPropagation();
  93             canvas.setCurrentElement(canvas.getDocumentElement(e.currentTarget), {caretTo: false});
  94         });
  95
  96
  97
  98         var observer = new MutationObserver(function(mutations) {
  99             mutations.forEach(function(mutation) {
 100                 if(documentElement.DocumentTextElement.isContentContainer(mutation.target)) {
 101                     observer.disconnect();
 102                     if(mutation.target.data === '')
 103                         mutation.target.data = utils.unicode.ZWS;
 104                     else if(mutation.oldValue === utils.unicode.ZWS) {
 105                         mutation.target.data = mutation.target.data.replace(utils.unicode.ZWS, '');
 106                         canvas._moveCaretToTextElement(canvas.getDocumentElement(mutation.target), 'end');
 107                     }
 108                     observer.observe(canvas.wrapper[0], config);
 109                     canvas.publisher('contentChanged');
 110
 111                     var textElement = canvas.getDocumentElement(mutation.target),
 112                         toSet = mutation.target.data !== utils.unicode.ZWS ? mutation.target.data : '';
 113
 114                     //textElement.data('wlxmlNode').setText(toSet);
 115                     //textElement.data('wlxmlNode').document.transform('setText', {node: textElement.data('wlxmlNode'), text: toSet});
 116                     if(textElement.data('wlxmlNode').getText() != toSet) {
 117                         canvas.textHandler.handle(textElement.data('wlxmlNode'), toSet);
 118                     }
 119                 }
 120             });
 121         });
 122         var config = { attributes: false, childList: false, characterData: true, subtree: true, characterDataOldValue: true};
 123         observer.observe(this.wrapper[0], config);
 124
 125
 126         this.wrapper.on('mouseover', '[document-node-element], [document-text-element]', function(e) {
 127             var el = canvas.getDocumentElement(e.currentTarget);
 128             if(!el)
 129                 return;
 130             e.stopPropagation();
 131             if(el instanceof documentElement.DocumentTextElement)
 132                 el = el.parent();
 133             el.toggleLabel(true);
 134         });
 135         this.wrapper.on('mouseout', '[document-node-element], [document-text-element]', function(e) {
 136             var el = canvas.getDocumentElement(e.currentTarget);
 137             if(!el)
 138                 return;
 139             e.stopPropagation();
 140             if(el instanceof documentElement.DocumentTextElement)
 141                 el = el.parent();
 142             el.toggleLabel(false);
 143         });
 144
 145         this.eventBus.on('elementToggled', function(toggle, element) {
 146             if(!toggle) {
 147                 canvas.setCurrentElement(element.getPreviousTextElement());
 148             }
 149         });
 150     },
 151
 152     view: function() {
 153         return this.wrapper;
 154     },
 155
 156     doc: function() {
 157         if(this.d === null)
 158             return null;
 159         return documentElement.DocumentNodeElement.fromHTMLElement(this.d.get(0), this); //{wlxmlTag: this.d.prop('tagName')};
 160     },
 161
 162     toggleElementHighlight: function(node, toggle) {
 163         var element = utils.findCanvasElement(node);
 164         element.toggleHighlight(toggle);
 165     },
 166
 167     createNodeElement: function(params) {
 168         return documentElement.DocumentNodeElement.create(params, this);
 169     },
 170
 171     getDocumentElement: function(from) {
 172         if(from instanceof HTMLElement || from instanceof Text) {
 173            return documentElement.DocumentElement.fromHTMLElement(from, this);
 174         }
 175     },
 176     getCursor: function() {
 177         return new Cursor(this);
 178     },
 179
 180     list: {},
 181
 182
 183     getCurrentNodeElement: function() {
 184         return this.getDocumentElement(this.wrapper.find('.current-node-element').parent()[0]);
 185     },
 186
 187     getCurrentTextElement: function() {
 188         return this.getDocumentElement(this.wrapper.find('.current-text-element')[0]);
 189     },
 190
 191
 192
 193     setCurrentElement: function(element, params) {
 194         if(!(element instanceof documentElement.DocumentElement)) {
 195             element = utils.findCanvasElement(element);
 196         }
 197
 198         params = _.extend({caretTo: 'end'}, params);
 199         var findFirstDirectTextChild = function(e, nodeToLand) {
 200             var byBrowser = this.getCursor().getPosition().element;
 201             if(byBrowser && byBrowser.parent().sameNode(nodeToLand))
 202                 return byBrowser;
 203             var children = e.children();
 204             for(var i = 0; i < children.length; i++) {
 205                 if(children[i] instanceof documentElement.DocumentTextElement)
 206                     return children[i];
 207             }
 208             return null;
 209         }.bind(this);
 210         var _markAsCurrent = function(element) {
 211             if(element instanceof documentElement.DocumentTextElement) {
 212                 this.wrapper.find('.current-text-element').removeClass('current-text-element');
 213                 element.dom().addClass('current-text-element');
 214             } else {
 215                 this.wrapper.find('.current-node-element').removeClass('current-node-element')
 216                 element._container().addClass('current-node-element');
 217                 this.publisher('currentElementChanged', element);
 218             }
 219         }.bind(this);
 220
 221
 222         var isTextElement = element instanceof documentElement.DocumentTextElement,
 223             nodeElementToLand = isTextElement ? element.parent() : element,
 224             textElementToLand = isTextElement ? element : findFirstDirectTextChild(element, nodeElementToLand),
 225             currentTextElement = this.getCurrentTextElement(),
 226             currentNodeElement = this.getCurrentNodeElement();
 227
 228         if(currentTextElement && !(currentTextElement.sameNode(textElementToLand)))
 229             this.wrapper.find('.current-text-element').removeClass('current-text-element');
 230
 231         if(textElementToLand) {
 232             _markAsCurrent(textElementToLand);
 233             if(params.caretTo || !textElementToLand.sameNode(this.getCursor().getPosition().element))
 234                 this._moveCaretToTextElement(textElementToLand, params.caretTo); // as method on element?
 235             if(!(textElementToLand.sameNode(currentTextElement)))
 236                 this.publisher('currentTextElementSet', textElementToLand.data('wlxmlNode'));
 237         } else {
 238             document.getSelection().removeAllRanges();
 239         }
 240
 241         if(!(currentNodeElement && currentNodeElement.sameNode(nodeElementToLand))) {
 242             _markAsCurrent(nodeElementToLand);
 243
 244             this.publisher('currentNodeElementSet', nodeElementToLand.data('wlxmlNode'));
 245         }
 246     },
 247
 248     _moveCaretToTextElement: function(element, where) {
 249         var range = document.createRange(),
 250             node = element.dom().contents()[0];
 251
 252         if(typeof where !== 'number') {
 253             range.selectNodeContents(node);
 254         } else {
 255             range.setStart(node, where);
 256         }
 257
 258         var collapseArg = true;
 259         if(where === 'end')
 260             collapseArg = false;
 261         range.collapse(collapseArg);
 262
 263         var selection = document.getSelection();
 264
 265         selection.removeAllRanges();
 266         selection.addRange(range);
 267         this.wrapper.focus(); // FF requires this for caret to be put where range colllapses, Chrome doesn't.
 268     },
 269
 270     setCursorPosition: function(position) {
 271         if(position.element)
 272             this._moveCaretToTextElement(position.element, position.offset);
 273     }
 274 });
 275
 276 $.extend(Canvas.prototype.list, {
 277     create: function(params) {
 278         if(!(params.element1.parent().sameNode(params.element2.parent())))
 279             return false;
 280
 281         var parent = params.element1.parent(),
 282             canvas = params.element1.canvas;
 283
 284         if(parent.childIndex(params.element1) > parent.childIndex(params.element2)) {
 285             var tmp = params.element1;
 286             params.element1 = params.element2;
 287             params.element2 = tmp;
 288         }
 289
 290         var elementsToWrap = [];
 291
 292         var place = 'before';
 293         parent.children().some(function(element) {
 294             var _e = element;
 295             if(element.sameNode(params.element1))
 296                 place = 'inside';
 297             if(place === 'inside') {
 298                 if(element instanceof documentElement.DocumentTextElement) {
 299                     element = element.wrapWithNodeElement({tag: 'div', klass: 'list.item'});
 300                     if(element.children()[0].sameNode(params.element1))
 301                         params.element1 = element;
 302                 }
 303                 element.setWlxmlClass('item');
 304                 elementsToWrap.push(element);
 305             }
 306             if(_e.sameNode(params.element2))
 307                 return true;
 308         });
 309
 310         var listElement = canvas.createNodeElement({tag: 'div', klass: 'list-items' + (params.type === 'enum' ? '-enum' : '')});
 311         var toret;
 312         if(parent.is('list')) {
 313             var item = listElement.wrapWithNodeElement({tag: 'div', klass: 'item'});
 314             item.exec('toggleBullet', false);
 315             toret = listElement.parent();
 316         } else {
 317             toret = listElement;
 318         }
 319
 320         params.element1.before(toret);
 321
 322         elementsToWrap.forEach(function(element) {
 323             element.detach();
 324             listElement.append(element);
 325         });
 326     },
 327     extractItems: function(params) {
 328         params = _.extend({merge: true}, params);
 329         var list = params.element1.parent();
 330         if(!list.is('list') || !(list.sameNode(params.element2.parent())))
 331             return false;
 332
 333         var idx1 = list.childIndex(params.element1),
 334             idx2 = list.childIndex(params.element2),
 335             precedingItems = [],
 336             extractedItems = [],
 337             succeedingItems = [],
 338             items = list.children(),
 339             listIsNested = list.parent().getWlxmlClass() === 'item',
 340             canvas = params.element1.canvas,
 341             i;
 342
 343         if(idx1 > idx2) {
 344             var tmp = idx1; idx1 = idx2; idx2 = tmp;
 345         }
 346
 347         items.forEach(function(item, idx) {
 348             if(idx < idx1)
 349                 precedingItems.push(item);
 350             else if(idx >= idx1 && idx <= idx2) {
 351                 extractedItems.push(item);
 352             }
 353             else {
 354                 succeedingItems.push(item);
 355             }
 356         });
 357
 358         var reference = listIsNested ? list.parent() : list;
 359         if(succeedingItems.length === 0) {
 360             var reference_orig = reference;
 361             extractedItems.forEach(function(item) {
 362                 reference.after(item);
 363                 reference = item;
 364                 if(!listIsNested)
 365                     item.setWlxmlClass(null);
 366             });
 367             if(precedingItems.length === 0)
 368                 reference_orig.detach();
 369         } else if(precedingItems.length === 0) {
 370             extractedItems.forEach(function(item) {
 371                 reference.before(item);
 372                 if(!listIsNested)
 373                     item.setWlxmlClass(null);
 374             });
 375         } else {
 376             extractedItems.forEach(function(item) {
 377                 reference.after(item);
 378                 if(!listIsNested)
 379                     item.setWlxmlClass(null);
 380                 reference = item;
 381             });
 382             var secondList = canvas.createNodeElement({tag: 'div', klass:'list-items'}),
 383                 toAdd = secondList;
 384
 385             if(listIsNested) {
 386                 toAdd = secondList.wrapWithNodeElement({tag: 'div', klass:'item'});
 387             }
 388             succeedingItems.forEach(function(item) {
 389                 secondList.append(item);
 390             });
 391
 392             reference.after(toAdd);
 393         }
 394         if(!params.merge && listIsNested) {
 395             return this.extractItems({element1: extractedItems[0], element2: extractedItems[extractedItems.length-1]});
 396         }
 397         return true;
 398     },
 399     areItemsOfTheSameList: function(params) {
 400         var e1 = params.element1,
 401             e2 = params.element2;
 402         return e1.parent().sameNode(e2.parent())
 403             && e1.parent().is('list');
 404     }
 405 });
 406
 407
 408 var Cursor = function(canvas) {
 409     this.canvas = canvas;
 410 };
 411
 412 $.extend(Cursor.prototype, {
 413     isSelecting: function() {
 414         var selection = window.getSelection();
 415         return !selection.isCollapsed;
 416     },
 417     isSelectingWithinElement: function() {
 418         return this.isSelecting() && this.getSelectionStart().element.sameNode(this.getSelectionEnd().element);
 419     },
 420     isSelectingSiblings: function() {
 421         return this.isSelecting() && this.getSelectionStart().element.parent().sameNode(this.getSelectionEnd().element.parent());
 422     },
 423     getPosition: function() {
 424         return this.getSelectionAnchor();
 425     },
 426     getSelectionStart: function() {
 427         return this.getSelectionBoundry('start');
 428     },
 429     getSelectionEnd: function() {
 430         return this.getSelectionBoundry('end');
 431     },
 432     getSelectionAnchor: function() {
 433         return this.getSelectionBoundry('anchor');
 434     },
 435     getSelectionFocus: function() {
 436         return this.getSelectionBoundry('focus');
 437     },
 438     getSelectionBoundry: function(which) {
 439         var selection = window.getSelection(),
 440             anchorElement = this.canvas.getDocumentElement(selection.anchorNode),
 441             focusElement = this.canvas.getDocumentElement(selection.focusNode);
 442
 443         if((!anchorElement) || (anchorElement instanceof documentElement.DocumentNodeElement) || (!focusElement) || focusElement instanceof documentElement.DocumentNodeElement)
 444             return {};
 445
 446         if(which === 'anchor') {
 447             return {
 448                 element: anchorElement,
 449                 offset: selection.anchorOffset,
 450                 offsetAtBeginning: selection.anchorOffset === 0,
 451                 offsetAtEnd: selection.anchorNode.data.length === selection.anchorOffset
 452             };
 453         }
 454         if(which === 'focus') {
 455             return {
 456                 element: focusElement,
 457                 offset: selection.focusOffset,
 458                 offsetAtBeginning: selection.focusOffset === 0,
 459                 offsetAtEnd: selection.focusNode.data.length === selection.focusOffset
 460             };
 461         }
 462
 463         var element,
 464             offset;
 465
 466         if(anchorElement.parent().sameNode(focusElement.parent())) {
 467             var parent = anchorElement.parent(),
 468                 anchorFirst = parent.childIndex(anchorElement) < parent.childIndex(focusElement);
 469             if(anchorFirst) {
 470                 if(which === 'start') {
 471                     element = anchorElement;
 472                     offset = selection.anchorOffset
 473                 }
 474                 else if(which === 'end') {
 475                     element = focusElement,
 476                     offset = selection.focusOffset
 477                 }
 478             } else {
 479                 if(which === 'start') {
 480                     element = focusElement,
 481                     offset = selection.focusOffset
 482                 }
 483                 else if(which === 'end') {
 484                     element = anchorElement;
 485                     offset = selection.anchorOffset
 486                 }
 487             }
 488         } else {
 489             // TODO: Handle order via https://developer.mozilla.org/en-US/docs/Web/API/Node.compareDocumentPosition
 490             if(which === 'start') {
 491                 element = anchorElement;
 492                 offset = selection.anchorOffset
 493             } else {
 494                 element = focusElement;
 495                 offset = selection.focusOffset
 496             }
 497         }
 498
 499         var nodeLen = (element.sameNode(focusElement) ? selection.focusNode : selection.anchorNode).length;
 500         return {
 501             element: element,
 502             offset: offset,
 503             offsetAtBeginning: offset === 0,
 504             offsetAtEnd: nodeLen === offset
 505         }
 506     }
 507 })
 508
 509 return {
 510     fromXMLDocument: function(wlxmlDocument, publisher) {
 511         return new Canvas(wlxmlDocument, publisher);
 512     }
 513 };
 514
 515 });