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 /* global document:false, window:false, Node:false */
  13
  14
  15 var TextHandler = function(canvas) {this.canvas = canvas; this.buffer = null;};
  16 $.extend(TextHandler.prototype, {
  17     handle: function(node, text) {
  18         this.setText(text, node);
  19         // return;
  20         // if(!this.node) {
  21         //     this.node = node;
  22         // }
  23         // if(this.node.sameNode(node)) {
  24         //     this._ping(text);
  25         // } else {
  26         //     this.flush();
  27         //     this.node = node;
  28         //     this._ping(text);
  29         // }
  30     },
  31     _ping: _.throttle(function(text) {
  32         this.buffer = text;
  33         this.flush();
  34     }, 1000),
  35     flush: function() {
  36         if(this.buffer !== null) {
  37             this.setText(this.buffer, this.node);
  38             this.buffer = null;
  39         }
  40     },
  41     setText: function(text, node) {
  42         //this.canvas.wlxmlDocument.transform('setText', {node:node, text: text});
  43         node.setText(text);
  44
  45     }
  46
  47 });
  48
  49
  50 var Canvas = function(wlxmlDocument, publisher) {
  51     this.eventBus = _.extend({}, Backbone.Events);
  52     this.wrapper = $('<div>').addClass('canvas-wrapper').attr('contenteditable', true);
  53     this.wlxmlListener = wlxmlListener.create(this);
  54     this.loadWlxmlDocument(wlxmlDocument);
  55     this.setupEventHandling();
  56     this.publisher = publisher ? publisher : function() {};
  57     this.textHandler = new TextHandler(this);
  58 };
  59
  60 $.extend(Canvas.prototype, {
  61
  62     loadWlxmlDocument: function(wlxmlDocument) {
  63         if(!wlxmlDocument) {
  64             return false;
  65         }
  66
  67         this.wlxmlListener.listenTo(wlxmlDocument);
  68         this.wlxmlDocument = wlxmlDocument;
  69         this.reloadRoot();
  70     },
  71
  72     reloadRoot: function() {
  73         var canvasDOM = this.generateCanvasDOM(this.wlxmlDocument.root);
  74         //var canvasDOM = this.wlxmlDocument.root.getData('canvasElement') ? this.wlxmlDocument.root.getData('canvasElement').dom() : this.generateCanvasDOM(this.wlxmlDocument.root);
  75
  76         this.wrapper.empty();
  77         this.wrapper.append(canvasDOM);
  78         this.d = this.wrapper.children(0);
  79     },
  80
  81     generateCanvasDOM: function(wlxmlNode) {
  82         var element = documentElement.DocumentNodeElement.create(wlxmlNode, this);
  83         return element.dom();
  84     },
  85
  86     setupEventHandling: function() {
  87         var canvas = this;
  88         this.wrapper.on('keyup keydown keypress', function(e) {
  89             keyboard.handleKey(e, this);
  90         }.bind(this));
  91
  92         var mouseDown;
  93         this.wrapper.on('mousedown', '[document-node-element], [document-text-element]', function(e) {
  94             mouseDown = e.target;
  95         });
  96
  97         this.wrapper.on('click', '[document-node-element], [document-text-element]', function(e) {
  98             e.stopPropagation();
  99             if(e.originalEvent.detail === 3) {
 100                 e.preventDefault();
 101                 canvas._moveCaretToTextElement(canvas.getDocumentElement(e.currentTarget), 'whole');
 102             } else {
 103                 if(mouseDown === e.target) {
 104                     canvas.setCurrentElement(canvas.getDocumentElement(e.currentTarget), {caretTo: false});
 105                 }
 106             }
 107         });
 108
 109         this.wrapper.on('paste', function(e) {
 110             e.preventDefault();
 111
 112             var clipboardData = e.originalEvent.clipboardData;
 113             if(!clipboardData || !clipboardData.getData) {
 114                 return; // TODO: alert
 115             }
 116
 117             var text = clipboardData.getData('text/plain').replace(/\r?\n|\r/g, ' '),
 118                 cursor = canvas.getCursor(),
 119                 element = cursor.getPosition().element,
 120                 lhs, rhs;
 121
 122             if(element && cursor.isWithinElement()) {
 123                 lhs = element.getText().substr(0, cursor.getSelectionStart().offset);
 124                 rhs = element.getText().substr(cursor.getSelectionEnd().offset);
 125                 element.setText(lhs+text+rhs);
 126                 canvas.setCurrentElement(element, {caretTo: lhs.length + text.length});
 127             } else {
 128                 /* jshint noempty:false */
 129                 // TODO: alert
 130             }
 131         });
 132
 133         /* globals MutationObserver */
 134         var observer = new MutationObserver(function(mutations) {
 135             mutations.forEach(function(mutation) {
 136                 if(documentElement.DocumentTextElement.isContentContainer(mutation.target)) {
 137                     observer.disconnect();
 138                     if(mutation.target.data === '') {
 139                         mutation.target.data = utils.unicode.ZWS;
 140                     }
 141                     else if(mutation.oldValue === utils.unicode.ZWS) {
 142                         mutation.target.data = mutation.target.data.replace(utils.unicode.ZWS, '');
 143                         canvas._moveCaretToTextElement(canvas.getDocumentElement(mutation.target), 'end');
 144                     }
 145                     observer.observe(canvas.wrapper[0], config);
 146
 147                     var textElement = canvas.getDocumentElement(mutation.target),
 148                         toSet = mutation.target.data !== utils.unicode.ZWS ? mutation.target.data : '';
 149
 150                     //textElement.data('wlxmlNode').setText(toSet);
 151                     //textElement.data('wlxmlNode').document.transform('setText', {node: textElement.data('wlxmlNode'), text: toSet});
 152                     if(textElement.data('wlxmlNode').getText() !== toSet) {
 153                         canvas.textHandler.handle(textElement.data('wlxmlNode'), toSet);
 154                     }
 155                 }
 156             });
 157         });
 158         var config = { attributes: false, childList: false, characterData: true, subtree: true, characterDataOldValue: true};
 159         observer.observe(this.wrapper[0], config);
 160
 161
 162         this.wrapper.on('mouseover', '[document-node-element], [document-text-element]', function(e) {
 163             var el = canvas.getDocumentElement(e.currentTarget);
 164             if(!el) {
 165                 return;
 166             }
 167             e.stopPropagation();
 168             if(el instanceof documentElement.DocumentTextElement) {
 169                 el = el.parent();
 170             }
 171             el.toggleLabel(true);
 172         });
 173         this.wrapper.on('mouseout', '[document-node-element], [document-text-element]', function(e) {
 174             var el = canvas.getDocumentElement(e.currentTarget);
 175             if(!el) {
 176                 return;
 177             }
 178             e.stopPropagation();
 179             if(el instanceof documentElement.DocumentTextElement) {
 180                 el = el.parent();
 181             }
 182             el.toggleLabel(false);
 183         });
 184
 185         this.eventBus.on('elementToggled', function(toggle, element) {
 186             if(!toggle) {
 187                 canvas.setCurrentElement(element.getPreviousTextElement());
 188             }
 189         });
 190     },
 191
 192     view: function() {
 193         return this.wrapper;
 194     },
 195
 196     doc: function() {
 197         if(this.d === null) {
 198             return null;
 199         }
 200         return documentElement.DocumentNodeElement.fromHTMLElement(this.d.get(0), this); //{wlxmlTag: this.d.prop('tagName')};
 201     },
 202
 203     toggleElementHighlight: function(node, toggle) {
 204         var element = utils.findCanvasElement(node);
 205         element.toggleHighlight(toggle);
 206     },
 207
 208     createNodeElement: function(params) {
 209         return documentElement.DocumentNodeElement.create(params, this);
 210     },
 211
 212     getDocumentElement: function(from) {
 213         /* globals HTMLElement, Text */
 214         if(from instanceof HTMLElement || from instanceof Text) {
 215            return documentElement.DocumentElement.fromHTMLElement(from, this);
 216         }
 217     },
 218     getCursor: function() {
 219         return new Cursor(this);
 220     },
 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         if(!(element instanceof documentElement.DocumentElement)) {
 235             element = utils.findCanvasElement(element);
 236         }
 237
 238         params = _.extend({caretTo: 'end'}, params);
 239         var findFirstDirectTextChild = function(e, nodeToLand) {
 240             var byBrowser = this.getCursor().getPosition().element;
 241             if(byBrowser && byBrowser.parent().sameNode(nodeToLand)) {
 242                 return byBrowser;
 243             }
 244             var children = e.children();
 245             for(var i = 0; i < children.length; i++) {
 246                 if(children[i] instanceof documentElement.DocumentTextElement) {
 247                     return children[i];
 248                 }
 249             }
 250             return null;
 251         }.bind(this);
 252         var _markAsCurrent = function(element) {
 253             if(element instanceof documentElement.DocumentTextElement) {
 254                 this.wrapper.find('.current-text-element').removeClass('current-text-element');
 255                 element.dom().addClass('current-text-element');
 256             } else {
 257                 this.wrapper.find('.current-node-element').removeClass('current-node-element');
 258                 element._container().addClass('current-node-element');
 259             }
 260         }.bind(this);
 261
 262
 263         var isTextElement = element instanceof documentElement.DocumentTextElement,
 264             nodeElementToLand = isTextElement ? element.parent() : element,
 265             textElementToLand = isTextElement ? element : findFirstDirectTextChild(element, nodeElementToLand),
 266             currentTextElement = this.getCurrentTextElement(),
 267             currentNodeElement = this.getCurrentNodeElement();
 268
 269         if(currentTextElement && !(currentTextElement.sameNode(textElementToLand))) {
 270             this.wrapper.find('.current-text-element').removeClass('current-text-element');
 271         }
 272
 273         if(textElementToLand) {
 274             _markAsCurrent(textElementToLand);
 275             if(params.caretTo || !textElementToLand.sameNode(this.getCursor().getPosition().element)) {
 276                 this._moveCaretToTextElement(textElementToLand, params.caretTo); // as method on element?
 277             }
 278             if(!(textElementToLand.sameNode(currentTextElement))) {
 279                 this.publisher('currentTextElementSet', textElementToLand.data('wlxmlNode'));
 280             }
 281         } else {
 282             document.getSelection().removeAllRanges();
 283         }
 284
 285         if(!(currentNodeElement && currentNodeElement.sameNode(nodeElementToLand))) {
 286             _markAsCurrent(nodeElementToLand);
 287
 288             this.publisher('currentNodeElementSet', nodeElementToLand.data('wlxmlNode'));
 289         }
 290     },
 291
 292     _moveCaretToTextElement: function(element, where) {
 293         var range = document.createRange(),
 294             node = element.dom().contents()[0];
 295
 296         if(typeof where !== 'number') {
 297             range.selectNodeContents(node);
 298         } else {
 299             range.setStart(node, where);
 300         }
 301
 302         if(where !== 'whole') {
 303             var collapseArg = true;
 304             if(where === 'end') {
 305                 collapseArg = false;
 306             }
 307             range.collapse(collapseArg);
 308         }
 309         var selection = document.getSelection();
 310
 311         selection.removeAllRanges();
 312         selection.addRange(range);
 313         this.wrapper.focus(); // FF requires this for caret to be put where range colllapses, Chrome doesn't.
 314     },
 315
 316     setCursorPosition: function(position) {
 317         if(position.element) {
 318             this._moveCaretToTextElement(position.element, position.offset);
 319         }
 320     }
 321 });
 322
 323
 324 var Cursor = function(canvas) {
 325     this.canvas = canvas;
 326 };
 327
 328 $.extend(Cursor.prototype, {
 329     isSelecting: function() {
 330         var selection = window.getSelection();
 331         return !selection.isCollapsed;
 332     },
 333     isSelectingWithinElement: function() {
 334         return this.isSelecting() && this.getSelectionStart().element.sameNode(this.getSelectionEnd().element);
 335     },
 336     isWithinElement: function() {
 337         return !this.isSelecting() || this.isSelectingWithinElement();
 338     },
 339     isSelectingSiblings: function() {
 340         return this.isSelecting() && this.getSelectionStart().element.parent().sameNode(this.getSelectionEnd().element.parent());
 341     },
 342     getPosition: function() {
 343         return this.getSelectionAnchor();
 344     },
 345     getSelectionStart: function() {
 346         return this.getSelectionBoundry('start');
 347     },
 348     getSelectionEnd: function() {
 349         return this.getSelectionBoundry('end');
 350     },
 351     getSelectionAnchor: function() {
 352         return this.getSelectionBoundry('anchor');
 353     },
 354     getSelectionFocus: function() {
 355         return this.getSelectionBoundry('focus');
 356     },
 357     getSelectionBoundry: function(which) {
 358         /* globals window */
 359         var selection = window.getSelection(),
 360             anchorElement = this.canvas.getDocumentElement(selection.anchorNode),
 361             focusElement = this.canvas.getDocumentElement(selection.focusNode);
 362
 363         if((!anchorElement) || (anchorElement instanceof documentElement.DocumentNodeElement) || (!focusElement) || focusElement instanceof documentElement.DocumentNodeElement) {
 364             return {};
 365         }
 366
 367         if(which === 'anchor') {
 368             return {
 369                 element: anchorElement,
 370                 offset: selection.anchorOffset,
 371                 offsetAtBeginning: selection.anchorOffset === 0 || anchorElement.getText() === '',
 372                 offsetAtEnd: selection.anchorNode.data.length === selection.anchorOffset || anchorElement.getText() === ''
 373             };
 374         }
 375         if(which === 'focus') {
 376             return {
 377                 element: focusElement,
 378                 offset: selection.focusOffset,
 379                 offsetAtBeginning: selection.focusOffset === 0 || focusElement.getText() === '',
 380                 offsetAtEnd: selection.focusNode.data.length === selection.focusOffset || focusElement.getText() === '',
 381             };
 382         }
 383
 384         var getPlaceData = function(anchorFirst) {
 385             var element, offset;
 386             if(anchorFirst) {
 387                 if(which === 'start') {
 388                     element = anchorElement;
 389                     offset = selection.anchorOffset;
 390                 }
 391                 else if(which === 'end') {
 392                     element = focusElement;
 393                     offset = selection.focusOffset;
 394                 }
 395             } else {
 396                 if(which === 'start') {
 397                     element = focusElement;
 398                     offset = selection.focusOffset;
 399                 }
 400                 else if(which === 'end') {
 401                     element = anchorElement;
 402                     offset = selection.anchorOffset;
 403                 }
 404             }
 405             return {element: element, offset: offset};
 406         };
 407
 408         var anchorFirst, placeData, parent;
 409
 410         if(anchorElement.parent().sameNode(focusElement.parent())) {
 411             parent = anchorElement.parent();
 412             if(selection.anchorNode === selection.focusNode) {
 413                 anchorFirst = selection.anchorOffset <= selection.focusOffset;
 414             } else {
 415                 anchorFirst = parent.childIndex(anchorElement) < parent.childIndex(focusElement);
 416             }
 417             placeData = getPlaceData(anchorFirst);
 418         } else {
 419             /*jshint bitwise: false*/
 420             anchorFirst = selection.anchorNode.compareDocumentPosition(selection.focusNode) & Node.DOCUMENT_POSITION_FOLLOWING;
 421             placeData = getPlaceData(anchorFirst);
 422         }
 423
 424         var nodeLen = (placeData.element.sameNode(focusElement) ? selection.focusNode : selection.anchorNode).length;
 425         return {
 426             element: placeData.element,
 427             offset: placeData.offset,
 428             offsetAtBeginning: placeData.offset === 0 || focusElement.getText() === '',
 429             offsetAtEnd: nodeLen === placeData.offset || focusElement.getText() === ''
 430         };
 431     }
 432 });
 433
 434 return {
 435     fromXMLDocument: function(wlxmlDocument, publisher) {
 436         return new Canvas(wlxmlDocument, publisher);
 437     }
 438 };
 439
 440 });