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                     canvas.publisher('contentChanged');
 147
 148                     var textElement = canvas.getDocumentElement(mutation.target),
 149                         toSet = mutation.target.data !== utils.unicode.ZWS ? mutation.target.data : '';
 150
 151                     //textElement.data('wlxmlNode').setText(toSet);
 152                     //textElement.data('wlxmlNode').document.transform('setText', {node: textElement.data('wlxmlNode'), text: toSet});
 153                     if(textElement.data('wlxmlNode').getText() !== toSet) {
 154                         canvas.textHandler.handle(textElement.data('wlxmlNode'), toSet);
 155                     }
 156                 }
 157             });
 158         });
 159         var config = { attributes: false, childList: false, characterData: true, subtree: true, characterDataOldValue: true};
 160         observer.observe(this.wrapper[0], config);
 161
 162
 163         this.wrapper.on('mouseover', '[document-node-element], [document-text-element]', function(e) {
 164             var el = canvas.getDocumentElement(e.currentTarget);
 165             if(!el) {
 166                 return;
 167             }
 168             e.stopPropagation();
 169             if(el instanceof documentElement.DocumentTextElement) {
 170                 el = el.parent();
 171             }
 172             el.toggleLabel(true);
 173         });
 174         this.wrapper.on('mouseout', '[document-node-element], [document-text-element]', function(e) {
 175             var el = canvas.getDocumentElement(e.currentTarget);
 176             if(!el) {
 177                 return;
 178             }
 179             e.stopPropagation();
 180             if(el instanceof documentElement.DocumentTextElement) {
 181                 el = el.parent();
 182             }
 183             el.toggleLabel(false);
 184         });
 185
 186         this.eventBus.on('elementToggled', function(toggle, element) {
 187             if(!toggle) {
 188                 canvas.setCurrentElement(element.getPreviousTextElement());
 189             }
 190         });
 191     },
 192
 193     view: function() {
 194         return this.wrapper;
 195     },
 196
 197     doc: function() {
 198         if(this.d === null) {
 199             return null;
 200         }
 201         return documentElement.DocumentNodeElement.fromHTMLElement(this.d.get(0), this); //{wlxmlTag: this.d.prop('tagName')};
 202     },
 203
 204     toggleElementHighlight: function(node, toggle) {
 205         var element = utils.findCanvasElement(node);
 206         element.toggleHighlight(toggle);
 207     },
 208
 209     createNodeElement: function(params) {
 210         return documentElement.DocumentNodeElement.create(params, this);
 211     },
 212
 213     getDocumentElement: function(from) {
 214         /* globals HTMLElement, Text */
 215         if(from instanceof HTMLElement || from instanceof Text) {
 216            return documentElement.DocumentElement.fromHTMLElement(from, this);
 217         }
 218     },
 219     getCursor: function() {
 220         return new Cursor(this);
 221     },
 222
 223
 224     getCurrentNodeElement: function() {
 225         return this.getDocumentElement(this.wrapper.find('.current-node-element').parent()[0]);
 226     },
 227
 228     getCurrentTextElement: function() {
 229         return this.getDocumentElement(this.wrapper.find('.current-text-element')[0]);
 230     },
 231
 232
 233
 234     setCurrentElement: function(element, params) {
 235         if(!(element instanceof documentElement.DocumentElement)) {
 236             element = utils.findCanvasElement(element);
 237         }
 238
 239         params = _.extend({caretTo: 'end'}, params);
 240         var findFirstDirectTextChild = function(e, nodeToLand) {
 241             var byBrowser = this.getCursor().getPosition().element;
 242             if(byBrowser && byBrowser.parent().sameNode(nodeToLand)) {
 243                 return byBrowser;
 244             }
 245             var children = e.children();
 246             for(var i = 0; i < children.length; i++) {
 247                 if(children[i] instanceof documentElement.DocumentTextElement) {
 248                     return children[i];
 249                 }
 250             }
 251             return null;
 252         }.bind(this);
 253         var _markAsCurrent = function(element) {
 254             if(element instanceof documentElement.DocumentTextElement) {
 255                 this.wrapper.find('.current-text-element').removeClass('current-text-element');
 256                 element.dom().addClass('current-text-element');
 257             } else {
 258                 this.wrapper.find('.current-node-element').removeClass('current-node-element');
 259                 element._container().addClass('current-node-element');
 260                 this.publisher('currentElementChanged', element);
 261             }
 262         }.bind(this);
 263
 264
 265         var isTextElement = element instanceof documentElement.DocumentTextElement,
 266             nodeElementToLand = isTextElement ? element.parent() : element,
 267             textElementToLand = isTextElement ? element : findFirstDirectTextChild(element, nodeElementToLand),
 268             currentTextElement = this.getCurrentTextElement(),
 269             currentNodeElement = this.getCurrentNodeElement();
 270
 271         if(currentTextElement && !(currentTextElement.sameNode(textElementToLand))) {
 272             this.wrapper.find('.current-text-element').removeClass('current-text-element');
 273         }
 274
 275         if(textElementToLand) {
 276             _markAsCurrent(textElementToLand);
 277             if(params.caretTo || !textElementToLand.sameNode(this.getCursor().getPosition().element)) {
 278                 this._moveCaretToTextElement(textElementToLand, params.caretTo); // as method on element?
 279             }
 280             if(!(textElementToLand.sameNode(currentTextElement))) {
 281                 this.publisher('currentTextElementSet', textElementToLand.data('wlxmlNode'));
 282             }
 283         } else {
 284             document.getSelection().removeAllRanges();
 285         }
 286
 287         if(!(currentNodeElement && currentNodeElement.sameNode(nodeElementToLand))) {
 288             _markAsCurrent(nodeElementToLand);
 289
 290             this.publisher('currentNodeElementSet', nodeElementToLand.data('wlxmlNode'));
 291         }
 292     },
 293
 294     _moveCaretToTextElement: function(element, where) {
 295         var range = document.createRange(),
 296             node = element.dom().contents()[0];
 297
 298         if(typeof where !== 'number') {
 299             range.selectNodeContents(node);
 300         } else {
 301             range.setStart(node, where);
 302         }
 303
 304         if(where !== 'whole') {
 305             var collapseArg = true;
 306             if(where === 'end') {
 307                 collapseArg = false;
 308             }
 309             range.collapse(collapseArg);
 310         }
 311         var selection = document.getSelection();
 312
 313         selection.removeAllRanges();
 314         selection.addRange(range);
 315         this.wrapper.focus(); // FF requires this for caret to be put where range colllapses, Chrome doesn't.
 316     },
 317
 318     setCursorPosition: function(position) {
 319         if(position.element) {
 320             this._moveCaretToTextElement(position.element, position.offset);
 321         }
 322     }
 323 });
 324
 325
 326 var Cursor = function(canvas) {
 327     this.canvas = canvas;
 328 };
 329
 330 $.extend(Cursor.prototype, {
 331     isSelecting: function() {
 332         var selection = window.getSelection();
 333         return !selection.isCollapsed;
 334     },
 335     isSelectingWithinElement: function() {
 336         return this.isSelecting() && this.getSelectionStart().element.sameNode(this.getSelectionEnd().element);
 337     },
 338     isWithinElement: function() {
 339         return !this.isSelecting() || this.isSelectingWithinElement();
 340     },
 341     isSelectingSiblings: function() {
 342         return this.isSelecting() && this.getSelectionStart().element.parent().sameNode(this.getSelectionEnd().element.parent());
 343     },
 344     getPosition: function() {
 345         return this.getSelectionAnchor();
 346     },
 347     getSelectionStart: function() {
 348         return this.getSelectionBoundry('start');
 349     },
 350     getSelectionEnd: function() {
 351         return this.getSelectionBoundry('end');
 352     },
 353     getSelectionAnchor: function() {
 354         return this.getSelectionBoundry('anchor');
 355     },
 356     getSelectionFocus: function() {
 357         return this.getSelectionBoundry('focus');
 358     },
 359     getSelectionBoundry: function(which) {
 360         /* globals window */
 361         var selection = window.getSelection(),
 362             anchorElement = this.canvas.getDocumentElement(selection.anchorNode),
 363             focusElement = this.canvas.getDocumentElement(selection.focusNode);
 364
 365         if((!anchorElement) || (anchorElement instanceof documentElement.DocumentNodeElement) || (!focusElement) || focusElement instanceof documentElement.DocumentNodeElement) {
 366             return {};
 367         }
 368
 369         if(which === 'anchor') {
 370             return {
 371                 element: anchorElement,
 372                 offset: selection.anchorOffset,
 373                 offsetAtBeginning: selection.anchorOffset === 0 || anchorElement.getText() === '',
 374                 offsetAtEnd: selection.anchorNode.data.length === selection.anchorOffset || anchorElement.getText() === ''
 375             };
 376         }
 377         if(which === 'focus') {
 378             return {
 379                 element: focusElement,
 380                 offset: selection.focusOffset,
 381                 offsetAtBeginning: selection.focusOffset === 0 || focusElement.getText() === '',
 382                 offsetAtEnd: selection.focusNode.data.length === selection.focusOffset || focusElement.getText() === '',
 383             };
 384         }
 385
 386         var getPlaceData = function(anchorFirst) {
 387             var element, offset;
 388             if(anchorFirst) {
 389                 if(which === 'start') {
 390                     element = anchorElement;
 391                     offset = selection.anchorOffset;
 392                 }
 393                 else if(which === 'end') {
 394                     element = focusElement;
 395                     offset = selection.focusOffset;
 396                 }
 397             } else {
 398                 if(which === 'start') {
 399                     element = focusElement;
 400                     offset = selection.focusOffset;
 401                 }
 402                 else if(which === 'end') {
 403                     element = anchorElement;
 404                     offset = selection.anchorOffset;
 405                 }
 406             }
 407             return {element: element, offset: offset};
 408         };
 409
 410         var anchorFirst, placeData, parent;
 411
 412         if(anchorElement.parent().sameNode(focusElement.parent())) {
 413             parent = anchorElement.parent();
 414             if(selection.anchorNode === selection.focusNode) {
 415                 anchorFirst = selection.anchorOffset <= selection.focusOffset;
 416             } else {
 417                 anchorFirst = parent.childIndex(anchorElement) < parent.childIndex(focusElement);
 418             }
 419             placeData = getPlaceData(anchorFirst);
 420         } else {
 421             /*jshint bitwise: false*/
 422             anchorFirst = selection.anchorNode.compareDocumentPosition(selection.focusNode) & Node.DOCUMENT_POSITION_FOLLOWING;
 423             placeData = getPlaceData(anchorFirst);
 424         }
 425
 426         var nodeLen = (placeData.element.sameNode(focusElement) ? selection.focusNode : selection.anchorNode).length;
 427         return {
 428             element: placeData.element,
 429             offset: placeData.offset,
 430             offsetAtBeginning: placeData.offset === 0 || focusElement.getText() === '',
 431             offsetAtEnd: nodeLen === placeData.offset || focusElement.getText() === ''
 432         };
 433     }
 434 });
 435
 436 return {
 437     fromXMLDocument: function(wlxmlDocument, publisher) {
 438         return new Canvas(wlxmlDocument, publisher);
 439     }
 440 };
 441
 442 });