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         this.wrapper.on('click', '[document-node-element], [document-text-element]', function(e) {
  93             e.stopPropagation();
  94             canvas.setCurrentElement(canvas.getDocumentElement(e.currentTarget), {caretTo: false});
  95         });
  96
  97         this.wrapper.on('paste', function(e) {
  98             e.preventDefault();
  99
 100             var clipboardData = e.originalEvent.clipboardData;
 101             if(!clipboardData || !clipboardData.getData) {
 102                 return; // TODO: alert
 103             }
 104
 105             var text = clipboardData.getData('text/plain').replace(/\r?\n|\r/g, ' '),
 106                 cursor = canvas.getCursor(),
 107                 element = cursor.getPosition().element,
 108                 lhs, rhs;
 109
 110             if(element && cursor.isWithinElement()) {
 111                 lhs = element.getText().substr(0, cursor.getSelectionStart().offset);
 112                 rhs = element.getText().substr(cursor.getSelectionEnd().offset);
 113                 element.setText(lhs+text+rhs);
 114                 canvas.setCurrentElement(element, {caretTo: lhs.length + text.length});
 115             } else {
 116                 /* jshint noempty:false */
 117                 // TODO: alert
 118             }
 119         });
 120
 121         /* globals MutationObserver */
 122         var observer = new MutationObserver(function(mutations) {
 123             mutations.forEach(function(mutation) {
 124                 if(documentElement.DocumentTextElement.isContentContainer(mutation.target)) {
 125                     observer.disconnect();
 126                     if(mutation.target.data === '') {
 127                         mutation.target.data = utils.unicode.ZWS;
 128                     }
 129                     else if(mutation.oldValue === utils.unicode.ZWS) {
 130                         mutation.target.data = mutation.target.data.replace(utils.unicode.ZWS, '');
 131                         canvas._moveCaretToTextElement(canvas.getDocumentElement(mutation.target), 'end');
 132                     }
 133                     observer.observe(canvas.wrapper[0], config);
 134                     canvas.publisher('contentChanged');
 135
 136                     var textElement = canvas.getDocumentElement(mutation.target),
 137                         toSet = mutation.target.data !== utils.unicode.ZWS ? mutation.target.data : '';
 138
 139                     //textElement.data('wlxmlNode').setText(toSet);
 140                     //textElement.data('wlxmlNode').document.transform('setText', {node: textElement.data('wlxmlNode'), text: toSet});
 141                     if(textElement.data('wlxmlNode').getText() !== toSet) {
 142                         canvas.textHandler.handle(textElement.data('wlxmlNode'), toSet);
 143                     }
 144                 }
 145             });
 146         });
 147         var config = { attributes: false, childList: false, characterData: true, subtree: true, characterDataOldValue: true};
 148         observer.observe(this.wrapper[0], config);
 149
 150
 151         this.wrapper.on('mouseover', '[document-node-element], [document-text-element]', function(e) {
 152             var el = canvas.getDocumentElement(e.currentTarget);
 153             if(!el) {
 154                 return;
 155             }
 156             e.stopPropagation();
 157             if(el instanceof documentElement.DocumentTextElement) {
 158                 el = el.parent();
 159             }
 160             el.toggleLabel(true);
 161         });
 162         this.wrapper.on('mouseout', '[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(false);
 172         });
 173
 174         this.eventBus.on('elementToggled', function(toggle, element) {
 175             if(!toggle) {
 176                 canvas.setCurrentElement(element.getPreviousTextElement());
 177             }
 178         });
 179     },
 180
 181     view: function() {
 182         return this.wrapper;
 183     },
 184
 185     doc: function() {
 186         if(this.d === null) {
 187             return null;
 188         }
 189         return documentElement.DocumentNodeElement.fromHTMLElement(this.d.get(0), this); //{wlxmlTag: this.d.prop('tagName')};
 190     },
 191
 192     toggleElementHighlight: function(node, toggle) {
 193         var element = utils.findCanvasElement(node);
 194         element.toggleHighlight(toggle);
 195     },
 196
 197     createNodeElement: function(params) {
 198         return documentElement.DocumentNodeElement.create(params, this);
 199     },
 200
 201     getDocumentElement: function(from) {
 202         /* globals HTMLElement, Text */
 203         if(from instanceof HTMLElement || from instanceof Text) {
 204            return documentElement.DocumentElement.fromHTMLElement(from, this);
 205         }
 206     },
 207     getCursor: function() {
 208         return new Cursor(this);
 209     },
 210
 211
 212     getCurrentNodeElement: function() {
 213         return this.getDocumentElement(this.wrapper.find('.current-node-element').parent()[0]);
 214     },
 215
 216     getCurrentTextElement: function() {
 217         return this.getDocumentElement(this.wrapper.find('.current-text-element')[0]);
 218     },
 219
 220
 221
 222     setCurrentElement: function(element, params) {
 223         if(!(element instanceof documentElement.DocumentElement)) {
 224             element = utils.findCanvasElement(element);
 225         }
 226
 227         params = _.extend({caretTo: 'end'}, params);
 228         var findFirstDirectTextChild = function(e, nodeToLand) {
 229             var byBrowser = this.getCursor().getPosition().element;
 230             if(byBrowser && byBrowser.parent().sameNode(nodeToLand)) {
 231                 return byBrowser;
 232             }
 233             var children = e.children();
 234             for(var i = 0; i < children.length; i++) {
 235                 if(children[i] instanceof documentElement.DocumentTextElement) {
 236                     return children[i];
 237                 }
 238             }
 239             return null;
 240         }.bind(this);
 241         var _markAsCurrent = function(element) {
 242             if(element instanceof documentElement.DocumentTextElement) {
 243                 this.wrapper.find('.current-text-element').removeClass('current-text-element');
 244                 element.dom().addClass('current-text-element');
 245             } else {
 246                 this.wrapper.find('.current-node-element').removeClass('current-node-element');
 247                 element._container().addClass('current-node-element');
 248                 this.publisher('currentElementChanged', element);
 249             }
 250         }.bind(this);
 251
 252
 253         var isTextElement = element instanceof documentElement.DocumentTextElement,
 254             nodeElementToLand = isTextElement ? element.parent() : element,
 255             textElementToLand = isTextElement ? element : findFirstDirectTextChild(element, nodeElementToLand),
 256             currentTextElement = this.getCurrentTextElement(),
 257             currentNodeElement = this.getCurrentNodeElement();
 258
 259         if(currentTextElement && !(currentTextElement.sameNode(textElementToLand))) {
 260             this.wrapper.find('.current-text-element').removeClass('current-text-element');
 261         }
 262
 263         if(textElementToLand) {
 264             _markAsCurrent(textElementToLand);
 265             if(params.caretTo || !textElementToLand.sameNode(this.getCursor().getPosition().element)) {
 266                 this._moveCaretToTextElement(textElementToLand, params.caretTo); // as method on element?
 267             }
 268             if(!(textElementToLand.sameNode(currentTextElement))) {
 269                 this.publisher('currentTextElementSet', textElementToLand.data('wlxmlNode'));
 270             }
 271         } else {
 272             document.getSelection().removeAllRanges();
 273         }
 274
 275         if(!(currentNodeElement && currentNodeElement.sameNode(nodeElementToLand))) {
 276             _markAsCurrent(nodeElementToLand);
 277
 278             this.publisher('currentNodeElementSet', nodeElementToLand.data('wlxmlNode'));
 279         }
 280     },
 281
 282     _moveCaretToTextElement: function(element, where) {
 283         var range = document.createRange(),
 284             node = element.dom().contents()[0];
 285
 286         if(typeof where !== 'number') {
 287             range.selectNodeContents(node);
 288         } else {
 289             range.setStart(node, where);
 290         }
 291
 292         var collapseArg = true;
 293         if(where === 'end') {
 294             collapseArg = false;
 295         }
 296         range.collapse(collapseArg);
 297
 298         var selection = document.getSelection();
 299
 300         selection.removeAllRanges();
 301         selection.addRange(range);
 302         this.wrapper.focus(); // FF requires this for caret to be put where range colllapses, Chrome doesn't.
 303     },
 304
 305     setCursorPosition: function(position) {
 306         if(position.element) {
 307             this._moveCaretToTextElement(position.element, position.offset);
 308         }
 309     }
 310 });
 311
 312
 313 var Cursor = function(canvas) {
 314     this.canvas = canvas;
 315 };
 316
 317 $.extend(Cursor.prototype, {
 318     isSelecting: function() {
 319         var selection = window.getSelection();
 320         return !selection.isCollapsed;
 321     },
 322     isSelectingWithinElement: function() {
 323         return this.isSelecting() && this.getSelectionStart().element.sameNode(this.getSelectionEnd().element);
 324     },
 325     isWithinElement: function() {
 326         return !this.isSelecting() || this.isSelectingWithinElement();
 327     },
 328     isSelectingSiblings: function() {
 329         return this.isSelecting() && this.getSelectionStart().element.parent().sameNode(this.getSelectionEnd().element.parent());
 330     },
 331     getPosition: function() {
 332         return this.getSelectionAnchor();
 333     },
 334     getSelectionStart: function() {
 335         return this.getSelectionBoundry('start');
 336     },
 337     getSelectionEnd: function() {
 338         return this.getSelectionBoundry('end');
 339     },
 340     getSelectionAnchor: function() {
 341         return this.getSelectionBoundry('anchor');
 342     },
 343     getSelectionFocus: function() {
 344         return this.getSelectionBoundry('focus');
 345     },
 346     getSelectionBoundry: function(which) {
 347         /* globals window */
 348         var selection = window.getSelection(),
 349             anchorElement = this.canvas.getDocumentElement(selection.anchorNode),
 350             focusElement = this.canvas.getDocumentElement(selection.focusNode);
 351
 352         if((!anchorElement) || (anchorElement instanceof documentElement.DocumentNodeElement) || (!focusElement) || focusElement instanceof documentElement.DocumentNodeElement) {
 353             return {};
 354         }
 355
 356         if(which === 'anchor') {
 357             return {
 358                 element: anchorElement,
 359                 offset: selection.anchorOffset,
 360                 offsetAtBeginning: selection.anchorOffset === 0 || anchorElement.getText() === '',
 361                 offsetAtEnd: selection.anchorNode.data.length === selection.anchorOffset || anchorElement.getText() === ''
 362             };
 363         }
 364         if(which === 'focus') {
 365             return {
 366                 element: focusElement,
 367                 offset: selection.focusOffset,
 368                 offsetAtBeginning: selection.focusOffset === 0 || focusElement.getText() === '',
 369                 offsetAtEnd: selection.focusNode.data.length === selection.focusOffset || focusElement.getText() === '',
 370             };
 371         }
 372
 373         var getPlaceData = function(anchorFirst) {
 374             var element, offset;
 375             if(anchorFirst) {
 376                 if(which === 'start') {
 377                     element = anchorElement;
 378                     offset = selection.anchorOffset;
 379                 }
 380                 else if(which === 'end') {
 381                     element = focusElement;
 382                     offset = selection.focusOffset;
 383                 }
 384             } else {
 385                 if(which === 'start') {
 386                     element = focusElement;
 387                     offset = selection.focusOffset;
 388                 }
 389                 else if(which === 'end') {
 390                     element = anchorElement;
 391                     offset = selection.anchorOffset;
 392                 }
 393             }
 394             return {element: element, offset: offset};
 395         };
 396
 397         var anchorFirst, placeData, parent;
 398
 399         if(anchorElement.parent().sameNode(focusElement.parent())) {
 400             parent = anchorElement.parent();
 401             if(selection.anchorNode === selection.focusNode) {
 402                 anchorFirst = selection.anchorOffset <= selection.focusOffset;
 403             } else {
 404                 anchorFirst = parent.childIndex(anchorElement) < parent.childIndex(focusElement);
 405             }
 406             placeData = getPlaceData(anchorFirst);
 407         } else {
 408             /*jshint bitwise: false*/
 409             anchorFirst = selection.anchorNode.compareDocumentPosition(selection.focusNode) & Node.DOCUMENT_POSITION_FOLLOWING;
 410             placeData = getPlaceData(anchorFirst);
 411         }
 412
 413         var nodeLen = (placeData.element.sameNode(focusElement) ? selection.focusNode : selection.anchorNode).length;
 414         return {
 415             element: placeData.element,
 416             offset: placeData.offset,
 417             offsetAtBeginning: placeData.offset === 0 || focusElement.getText() === '',
 418             offsetAtEnd: nodeLen === placeData.offset || focusElement.getText() === ''
 419         };
 420     }
 421 });
 422
 423 return {
 424     fromXMLDocument: function(wlxmlDocument, publisher) {
 425         return new Canvas(wlxmlDocument, publisher);
 426     }
 427 };
 428
 429 });