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             if(e.originalEvent.detail === 3) {
  95                 e.preventDefault();
  96                 canvas._moveCaretToTextElement(canvas.getDocumentElement(e.currentTarget), 'whole');
  97             } else {
  98                 canvas.setCurrentElement(canvas.getDocumentElement(e.currentTarget), {caretTo: false});
  99             }
 100         });
 101
 102         this.wrapper.on('paste', function(e) {
 103             e.preventDefault();
 104
 105             var clipboardData = e.originalEvent.clipboardData;
 106             if(!clipboardData || !clipboardData.getData) {
 107                 return; // TODO: alert
 108             }
 109
 110             var text = clipboardData.getData('text/plain').replace(/\r?\n|\r/g, ' '),
 111                 cursor = canvas.getCursor(),
 112                 element = cursor.getPosition().element,
 113                 lhs, rhs;
 114
 115             if(element && cursor.isWithinElement()) {
 116                 lhs = element.getText().substr(0, cursor.getSelectionStart().offset);
 117                 rhs = element.getText().substr(cursor.getSelectionEnd().offset);
 118                 element.setText(lhs+text+rhs);
 119                 canvas.setCurrentElement(element, {caretTo: lhs.length + text.length});
 120             } else {
 121                 /* jshint noempty:false */
 122                 // TODO: alert
 123             }
 124         });
 125
 126         /* globals MutationObserver */
 127         var observer = new MutationObserver(function(mutations) {
 128             mutations.forEach(function(mutation) {
 129                 if(documentElement.DocumentTextElement.isContentContainer(mutation.target)) {
 130                     observer.disconnect();
 131                     if(mutation.target.data === '') {
 132                         mutation.target.data = utils.unicode.ZWS;
 133                     }
 134                     else if(mutation.oldValue === utils.unicode.ZWS) {
 135                         mutation.target.data = mutation.target.data.replace(utils.unicode.ZWS, '');
 136                         canvas._moveCaretToTextElement(canvas.getDocumentElement(mutation.target), 'end');
 137                     }
 138                     observer.observe(canvas.wrapper[0], config);
 139                     canvas.publisher('contentChanged');
 140
 141                     var textElement = canvas.getDocumentElement(mutation.target),
 142                         toSet = mutation.target.data !== utils.unicode.ZWS ? mutation.target.data : '';
 143
 144                     //textElement.data('wlxmlNode').setText(toSet);
 145                     //textElement.data('wlxmlNode').document.transform('setText', {node: textElement.data('wlxmlNode'), text: toSet});
 146                     if(textElement.data('wlxmlNode').getText() !== toSet) {
 147                         canvas.textHandler.handle(textElement.data('wlxmlNode'), toSet);
 148                     }
 149                 }
 150             });
 151         });
 152         var config = { attributes: false, childList: false, characterData: true, subtree: true, characterDataOldValue: true};
 153         observer.observe(this.wrapper[0], config);
 154
 155
 156         this.wrapper.on('mouseover', '[document-node-element], [document-text-element]', function(e) {
 157             var el = canvas.getDocumentElement(e.currentTarget);
 158             if(!el) {
 159                 return;
 160             }
 161             e.stopPropagation();
 162             if(el instanceof documentElement.DocumentTextElement) {
 163                 el = el.parent();
 164             }
 165             el.toggleLabel(true);
 166         });
 167         this.wrapper.on('mouseout', '[document-node-element], [document-text-element]', function(e) {
 168             var el = canvas.getDocumentElement(e.currentTarget);
 169             if(!el) {
 170                 return;
 171             }
 172             e.stopPropagation();
 173             if(el instanceof documentElement.DocumentTextElement) {
 174                 el = el.parent();
 175             }
 176             el.toggleLabel(false);
 177         });
 178
 179         this.eventBus.on('elementToggled', function(toggle, element) {
 180             if(!toggle) {
 181                 canvas.setCurrentElement(element.getPreviousTextElement());
 182             }
 183         });
 184     },
 185
 186     view: function() {
 187         return this.wrapper;
 188     },
 189
 190     doc: function() {
 191         if(this.d === null) {
 192             return null;
 193         }
 194         return documentElement.DocumentNodeElement.fromHTMLElement(this.d.get(0), this); //{wlxmlTag: this.d.prop('tagName')};
 195     },
 196
 197     toggleElementHighlight: function(node, toggle) {
 198         var element = utils.findCanvasElement(node);
 199         element.toggleHighlight(toggle);
 200     },
 201
 202     createNodeElement: function(params) {
 203         return documentElement.DocumentNodeElement.create(params, this);
 204     },
 205
 206     getDocumentElement: function(from) {
 207         /* globals HTMLElement, Text */
 208         if(from instanceof HTMLElement || from instanceof Text) {
 209            return documentElement.DocumentElement.fromHTMLElement(from, this);
 210         }
 211     },
 212     getCursor: function() {
 213         return new Cursor(this);
 214     },
 215
 216
 217     getCurrentNodeElement: function() {
 218         return this.getDocumentElement(this.wrapper.find('.current-node-element').parent()[0]);
 219     },
 220
 221     getCurrentTextElement: function() {
 222         return this.getDocumentElement(this.wrapper.find('.current-text-element')[0]);
 223     },
 224
 225
 226
 227     setCurrentElement: function(element, params) {
 228         if(!(element instanceof documentElement.DocumentElement)) {
 229             element = utils.findCanvasElement(element);
 230         }
 231
 232         params = _.extend({caretTo: 'end'}, params);
 233         var findFirstDirectTextChild = function(e, nodeToLand) {
 234             var byBrowser = this.getCursor().getPosition().element;
 235             if(byBrowser && byBrowser.parent().sameNode(nodeToLand)) {
 236                 return byBrowser;
 237             }
 238             var children = e.children();
 239             for(var i = 0; i < children.length; i++) {
 240                 if(children[i] instanceof documentElement.DocumentTextElement) {
 241                     return children[i];
 242                 }
 243             }
 244             return null;
 245         }.bind(this);
 246         var _markAsCurrent = function(element) {
 247             if(element instanceof documentElement.DocumentTextElement) {
 248                 this.wrapper.find('.current-text-element').removeClass('current-text-element');
 249                 element.dom().addClass('current-text-element');
 250             } else {
 251                 this.wrapper.find('.current-node-element').removeClass('current-node-element');
 252                 element._container().addClass('current-node-element');
 253                 this.publisher('currentElementChanged', element);
 254             }
 255         }.bind(this);
 256
 257
 258         var isTextElement = element instanceof documentElement.DocumentTextElement,
 259             nodeElementToLand = isTextElement ? element.parent() : element,
 260             textElementToLand = isTextElement ? element : findFirstDirectTextChild(element, nodeElementToLand),
 261             currentTextElement = this.getCurrentTextElement(),
 262             currentNodeElement = this.getCurrentNodeElement();
 263
 264         if(currentTextElement && !(currentTextElement.sameNode(textElementToLand))) {
 265             this.wrapper.find('.current-text-element').removeClass('current-text-element');
 266         }
 267
 268         if(textElementToLand) {
 269             _markAsCurrent(textElementToLand);
 270             if(params.caretTo || !textElementToLand.sameNode(this.getCursor().getPosition().element)) {
 271                 this._moveCaretToTextElement(textElementToLand, params.caretTo); // as method on element?
 272             }
 273             if(!(textElementToLand.sameNode(currentTextElement))) {
 274                 this.publisher('currentTextElementSet', textElementToLand.data('wlxmlNode'));
 275             }
 276         } else {
 277             document.getSelection().removeAllRanges();
 278         }
 279
 280         if(!(currentNodeElement && currentNodeElement.sameNode(nodeElementToLand))) {
 281             _markAsCurrent(nodeElementToLand);
 282
 283             this.publisher('currentNodeElementSet', nodeElementToLand.data('wlxmlNode'));
 284         }
 285     },
 286
 287     _moveCaretToTextElement: function(element, where) {
 288         var range = document.createRange(),
 289             node = element.dom().contents()[0];
 290
 291         if(typeof where !== 'number') {
 292             range.selectNodeContents(node);
 293         } else {
 294             range.setStart(node, where);
 295         }
 296
 297         if(where !== 'whole') {
 298             var collapseArg = true;
 299             if(where === 'end') {
 300                 collapseArg = false;
 301             }
 302             range.collapse(collapseArg);
 303         }
 304         var selection = document.getSelection();
 305
 306         selection.removeAllRanges();
 307         selection.addRange(range);
 308         this.wrapper.focus(); // FF requires this for caret to be put where range colllapses, Chrome doesn't.
 309     },
 310
 311     setCursorPosition: function(position) {
 312         if(position.element) {
 313             this._moveCaretToTextElement(position.element, position.offset);
 314         }
 315     }
 316 });
 317
 318
 319 var Cursor = function(canvas) {
 320     this.canvas = canvas;
 321 };
 322
 323 $.extend(Cursor.prototype, {
 324     isSelecting: function() {
 325         var selection = window.getSelection();
 326         return !selection.isCollapsed;
 327     },
 328     isSelectingWithinElement: function() {
 329         return this.isSelecting() && this.getSelectionStart().element.sameNode(this.getSelectionEnd().element);
 330     },
 331     isWithinElement: function() {
 332         return !this.isSelecting() || this.isSelectingWithinElement();
 333     },
 334     isSelectingSiblings: function() {
 335         return this.isSelecting() && this.getSelectionStart().element.parent().sameNode(this.getSelectionEnd().element.parent());
 336     },
 337     getPosition: function() {
 338         return this.getSelectionAnchor();
 339     },
 340     getSelectionStart: function() {
 341         return this.getSelectionBoundry('start');
 342     },
 343     getSelectionEnd: function() {
 344         return this.getSelectionBoundry('end');
 345     },
 346     getSelectionAnchor: function() {
 347         return this.getSelectionBoundry('anchor');
 348     },
 349     getSelectionFocus: function() {
 350         return this.getSelectionBoundry('focus');
 351     },
 352     getSelectionBoundry: function(which) {
 353         /* globals window */
 354         var selection = window.getSelection(),
 355             anchorElement = this.canvas.getDocumentElement(selection.anchorNode),
 356             focusElement = this.canvas.getDocumentElement(selection.focusNode);
 357
 358         if((!anchorElement) || (anchorElement instanceof documentElement.DocumentNodeElement) || (!focusElement) || focusElement instanceof documentElement.DocumentNodeElement) {
 359             return {};
 360         }
 361
 362         if(which === 'anchor') {
 363             return {
 364                 element: anchorElement,
 365                 offset: selection.anchorOffset,
 366                 offsetAtBeginning: selection.anchorOffset === 0 || anchorElement.getText() === '',
 367                 offsetAtEnd: selection.anchorNode.data.length === selection.anchorOffset || anchorElement.getText() === ''
 368             };
 369         }
 370         if(which === 'focus') {
 371             return {
 372                 element: focusElement,
 373                 offset: selection.focusOffset,
 374                 offsetAtBeginning: selection.focusOffset === 0 || focusElement.getText() === '',
 375                 offsetAtEnd: selection.focusNode.data.length === selection.focusOffset || focusElement.getText() === '',
 376             };
 377         }
 378
 379         var getPlaceData = function(anchorFirst) {
 380             var element, offset;
 381             if(anchorFirst) {
 382                 if(which === 'start') {
 383                     element = anchorElement;
 384                     offset = selection.anchorOffset;
 385                 }
 386                 else if(which === 'end') {
 387                     element = focusElement;
 388                     offset = selection.focusOffset;
 389                 }
 390             } else {
 391                 if(which === 'start') {
 392                     element = focusElement;
 393                     offset = selection.focusOffset;
 394                 }
 395                 else if(which === 'end') {
 396                     element = anchorElement;
 397                     offset = selection.anchorOffset;
 398                 }
 399             }
 400             return {element: element, offset: offset};
 401         };
 402
 403         var anchorFirst, placeData, parent;
 404
 405         if(anchorElement.parent().sameNode(focusElement.parent())) {
 406             parent = anchorElement.parent();
 407             if(selection.anchorNode === selection.focusNode) {
 408                 anchorFirst = selection.anchorOffset <= selection.focusOffset;
 409             } else {
 410                 anchorFirst = parent.childIndex(anchorElement) < parent.childIndex(focusElement);
 411             }
 412             placeData = getPlaceData(anchorFirst);
 413         } else {
 414             /*jshint bitwise: false*/
 415             anchorFirst = selection.anchorNode.compareDocumentPosition(selection.focusNode) & Node.DOCUMENT_POSITION_FOLLOWING;
 416             placeData = getPlaceData(anchorFirst);
 417         }
 418
 419         var nodeLen = (placeData.element.sameNode(focusElement) ? selection.focusNode : selection.anchorNode).length;
 420         return {
 421             element: placeData.element,
 422             offset: placeData.offset,
 423             offsetAtBeginning: placeData.offset === 0 || focusElement.getText() === '',
 424             offsetAtEnd: nodeLen === placeData.offset || focusElement.getText() === ''
 425         };
 426     }
 427 });
 428
 429 return {
 430     fromXMLDocument: function(wlxmlDocument, publisher) {
 431         return new Canvas(wlxmlDocument, publisher);
 432     }
 433 };
 434
 435 });