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 */
  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.publisher = publisher ? publisher : function() {};
  56     this.textHandler = new TextHandler(this);
  57 };
  58
  59 $.extend(Canvas.prototype, {
  60
  61     loadWlxmlDocument: function(wlxmlDocument) {
  62         if(!wlxmlDocument) {
  63             return false;
  64         }
  65
  66         this.wlxmlListener.listenTo(wlxmlDocument);
  67         this.wlxmlDocument = wlxmlDocument;
  68         this.reloadRoot();
  69         this.setupEventHandling();
  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
  98         /* globals MutationObserver */
  99         var observer = new MutationObserver(function(mutations) {
 100             mutations.forEach(function(mutation) {
 101                 if(documentElement.DocumentTextElement.isContentContainer(mutation.target)) {
 102                     observer.disconnect();
 103                     if(mutation.target.data === '') {
 104                         mutation.target.data = utils.unicode.ZWS;
 105                     }
 106                     else if(mutation.oldValue === utils.unicode.ZWS) {
 107                         mutation.target.data = mutation.target.data.replace(utils.unicode.ZWS, '');
 108                         canvas._moveCaretToTextElement(canvas.getDocumentElement(mutation.target), 'end');
 109                     }
 110                     observer.observe(canvas.wrapper[0], config);
 111                     canvas.publisher('contentChanged');
 112
 113                     var textElement = canvas.getDocumentElement(mutation.target),
 114                         toSet = mutation.target.data !== utils.unicode.ZWS ? mutation.target.data : '';
 115
 116                     //textElement.data('wlxmlNode').setText(toSet);
 117                     //textElement.data('wlxmlNode').document.transform('setText', {node: textElement.data('wlxmlNode'), text: toSet});
 118                     if(textElement.data('wlxmlNode').getText() !== toSet) {
 119                         canvas.textHandler.handle(textElement.data('wlxmlNode'), toSet);
 120                     }
 121                 }
 122             });
 123         });
 124         var config = { attributes: false, childList: false, characterData: true, subtree: true, characterDataOldValue: true};
 125         observer.observe(this.wrapper[0], config);
 126
 127
 128         this.wrapper.on('mouseover', '[document-node-element], [document-text-element]', function(e) {
 129             var el = canvas.getDocumentElement(e.currentTarget);
 130             if(!el) {
 131                 return;
 132             }
 133             e.stopPropagation();
 134             if(el instanceof documentElement.DocumentTextElement) {
 135                 el = el.parent();
 136             }
 137             el.toggleLabel(true);
 138         });
 139         this.wrapper.on('mouseout', '[document-node-element], [document-text-element]', function(e) {
 140             var el = canvas.getDocumentElement(e.currentTarget);
 141             if(!el) {
 142                 return;
 143             }
 144             e.stopPropagation();
 145             if(el instanceof documentElement.DocumentTextElement) {
 146                 el = el.parent();
 147             }
 148             el.toggleLabel(false);
 149         });
 150
 151         this.eventBus.on('elementToggled', function(toggle, element) {
 152             if(!toggle) {
 153                 canvas.setCurrentElement(element.getPreviousTextElement());
 154             }
 155         });
 156     },
 157
 158     view: function() {
 159         return this.wrapper;
 160     },
 161
 162     doc: function() {
 163         if(this.d === null) {
 164             return null;
 165         }
 166         return documentElement.DocumentNodeElement.fromHTMLElement(this.d.get(0), this); //{wlxmlTag: this.d.prop('tagName')};
 167     },
 168
 169     toggleElementHighlight: function(node, toggle) {
 170         var element = utils.findCanvasElement(node);
 171         element.toggleHighlight(toggle);
 172     },
 173
 174     createNodeElement: function(params) {
 175         return documentElement.DocumentNodeElement.create(params, this);
 176     },
 177
 178     getDocumentElement: function(from) {
 179         /* globals HTMLElement, Text */
 180         if(from instanceof HTMLElement || from instanceof Text) {
 181            return documentElement.DocumentElement.fromHTMLElement(from, this);
 182         }
 183     },
 184     getCursor: function() {
 185         return new Cursor(this);
 186     },
 187
 188
 189     getCurrentNodeElement: function() {
 190         return this.getDocumentElement(this.wrapper.find('.current-node-element').parent()[0]);
 191     },
 192
 193     getCurrentTextElement: function() {
 194         return this.getDocumentElement(this.wrapper.find('.current-text-element')[0]);
 195     },
 196
 197
 198
 199     setCurrentElement: function(element, params) {
 200         if(!(element instanceof documentElement.DocumentElement)) {
 201             element = utils.findCanvasElement(element);
 202         }
 203
 204         params = _.extend({caretTo: 'end'}, params);
 205         var findFirstDirectTextChild = function(e, nodeToLand) {
 206             var byBrowser = this.getCursor().getPosition().element;
 207             if(byBrowser && byBrowser.parent().sameNode(nodeToLand)) {
 208                 return byBrowser;
 209             }
 210             var children = e.children();
 211             for(var i = 0; i < children.length; i++) {
 212                 if(children[i] instanceof documentElement.DocumentTextElement) {
 213                     return children[i];
 214                 }
 215             }
 216             return null;
 217         }.bind(this);
 218         var _markAsCurrent = function(element) {
 219             if(element instanceof documentElement.DocumentTextElement) {
 220                 this.wrapper.find('.current-text-element').removeClass('current-text-element');
 221                 element.dom().addClass('current-text-element');
 222             } else {
 223                 this.wrapper.find('.current-node-element').removeClass('current-node-element');
 224                 element._container().addClass('current-node-element');
 225                 this.publisher('currentElementChanged', element);
 226             }
 227         }.bind(this);
 228
 229
 230         var isTextElement = element instanceof documentElement.DocumentTextElement,
 231             nodeElementToLand = isTextElement ? element.parent() : element,
 232             textElementToLand = isTextElement ? element : findFirstDirectTextChild(element, nodeElementToLand),
 233             currentTextElement = this.getCurrentTextElement(),
 234             currentNodeElement = this.getCurrentNodeElement();
 235
 236         if(currentTextElement && !(currentTextElement.sameNode(textElementToLand))) {
 237             this.wrapper.find('.current-text-element').removeClass('current-text-element');
 238         }
 239
 240         if(textElementToLand) {
 241             _markAsCurrent(textElementToLand);
 242             if(params.caretTo || !textElementToLand.sameNode(this.getCursor().getPosition().element)) {
 243                 this._moveCaretToTextElement(textElementToLand, params.caretTo); // as method on element?
 244             }
 245             if(!(textElementToLand.sameNode(currentTextElement))) {
 246                 this.publisher('currentTextElementSet', textElementToLand.data('wlxmlNode'));
 247             }
 248         } else {
 249             document.getSelection().removeAllRanges();
 250         }
 251
 252         if(!(currentNodeElement && currentNodeElement.sameNode(nodeElementToLand))) {
 253             _markAsCurrent(nodeElementToLand);
 254
 255             this.publisher('currentNodeElementSet', nodeElementToLand.data('wlxmlNode'));
 256         }
 257     },
 258
 259     _moveCaretToTextElement: function(element, where) {
 260         var range = document.createRange(),
 261             node = element.dom().contents()[0];
 262
 263         if(typeof where !== 'number') {
 264             range.selectNodeContents(node);
 265         } else {
 266             range.setStart(node, where);
 267         }
 268
 269         var collapseArg = true;
 270         if(where === 'end') {
 271             collapseArg = false;
 272         }
 273         range.collapse(collapseArg);
 274
 275         var selection = document.getSelection();
 276
 277         selection.removeAllRanges();
 278         selection.addRange(range);
 279         this.wrapper.focus(); // FF requires this for caret to be put where range colllapses, Chrome doesn't.
 280     },
 281
 282     setCursorPosition: function(position) {
 283         if(position.element) {
 284             this._moveCaretToTextElement(position.element, position.offset);
 285         }
 286     }
 287 });
 288
 289
 290 var Cursor = function(canvas) {
 291     this.canvas = canvas;
 292 };
 293
 294 $.extend(Cursor.prototype, {
 295     isSelecting: function() {
 296         var selection = window.getSelection();
 297         return !selection.isCollapsed;
 298     },
 299     isSelectingWithinElement: function() {
 300         return this.isSelecting() && this.getSelectionStart().element.sameNode(this.getSelectionEnd().element);
 301     },
 302     isSelectingSiblings: function() {
 303         return this.isSelecting() && this.getSelectionStart().element.parent().sameNode(this.getSelectionEnd().element.parent());
 304     },
 305     getPosition: function() {
 306         return this.getSelectionAnchor();
 307     },
 308     getSelectionStart: function() {
 309         return this.getSelectionBoundry('start');
 310     },
 311     getSelectionEnd: function() {
 312         return this.getSelectionBoundry('end');
 313     },
 314     getSelectionAnchor: function() {
 315         return this.getSelectionBoundry('anchor');
 316     },
 317     getSelectionFocus: function() {
 318         return this.getSelectionBoundry('focus');
 319     },
 320     getSelectionBoundry: function(which) {
 321         /* globals window */
 322         var selection = window.getSelection(),
 323             anchorElement = this.canvas.getDocumentElement(selection.anchorNode),
 324             focusElement = this.canvas.getDocumentElement(selection.focusNode);
 325
 326         if((!anchorElement) || (anchorElement instanceof documentElement.DocumentNodeElement) || (!focusElement) || focusElement instanceof documentElement.DocumentNodeElement) {
 327             return {};
 328         }
 329
 330         if(which === 'anchor') {
 331             return {
 332                 element: anchorElement,
 333                 offset: selection.anchorOffset,
 334                 offsetAtBeginning: selection.anchorOffset === 0,
 335                 offsetAtEnd: selection.anchorNode.data.length === selection.anchorOffset
 336             };
 337         }
 338         if(which === 'focus') {
 339             return {
 340                 element: focusElement,
 341                 offset: selection.focusOffset,
 342                 offsetAtBeginning: selection.focusOffset === 0,
 343                 offsetAtEnd: selection.focusNode.data.length === selection.focusOffset
 344             };
 345         }
 346
 347         var element,
 348             offset;
 349
 350         if(anchorElement.parent().sameNode(focusElement.parent())) {
 351             var parent = anchorElement.parent(),
 352                 anchorFirst = parent.childIndex(anchorElement) < parent.childIndex(focusElement);
 353             if(anchorFirst) {
 354                 if(which === 'start') {
 355                     element = anchorElement;
 356                     offset = selection.anchorOffset;
 357                 }
 358                 else if(which === 'end') {
 359                     element = focusElement;
 360                     offset = selection.focusOffset;
 361                 }
 362             } else {
 363                 if(which === 'start') {
 364                     element = focusElement;
 365                     offset = selection.focusOffset;
 366                 }
 367                 else if(which === 'end') {
 368                     element = anchorElement;
 369                     offset = selection.anchorOffset;
 370                 }
 371             }
 372         } else {
 373             // TODO: Handle order via https://developer.mozilla.org/en-US/docs/Web/API/Node.compareDocumentPosition
 374             if(which === 'start') {
 375                 element = anchorElement;
 376                 offset = selection.anchorOffset;
 377             } else {
 378                 element = focusElement;
 379                 offset = selection.focusOffset;
 380             }
 381         }
 382
 383         var nodeLen = (element.sameNode(focusElement) ? selection.focusNode : selection.anchorNode).length;
 384         return {
 385             element: element,
 386             offset: offset,
 387             offsetAtBeginning: offset === 0,
 388             offsetAtEnd: nodeLen === offset
 389         };
 390     }
 391 });
 392
 393 return {
 394     fromXMLDocument: function(wlxmlDocument, publisher) {
 395         return new Canvas(wlxmlDocument, publisher);
 396     }
 397 };
 398
 399 });