src/editor/modules/documentCanvas/canvas/wlxmlListener.js

   1 define([
   2 'libs/jquery',
   3 'modules/documentCanvas/canvas/utils',
   4 ], function($, utils) {
   5
   6 'use strict';
   7
   8 var Listener = function(canvas) {
   9     this.canvas = canvas;
  10 };
  11
  12 $.extend(Listener.prototype, {
  13     listenTo: function(wlxmlDocument) {
  14         if(wlxmlDocument === this.wlxmlDocument) {
  15             return;
  16         }
  17         this.wlxmlDocument = wlxmlDocument;
  18
  19         wlxmlDocument.on('change', function(event) {
  20             var handler = handlers[event.type];
  21             if(handler) {
  22                 handler.bind(this)(event);
  23             }
  24         }, this);
  25
  26         wlxmlDocument.on('contentSet', function() {
  27             this.canvas.loadWlxmlDocument(wlxmlDocument);
  28         }, this);
  29     }
  30 });
  31
  32
  33 var _metadataEventHandler = function(event) {
  34     var canvasNode = utils.findCanvasElement(event.meta.node);
  35     canvasNode.exec('updateMetadata');
  36 };
  37
  38 var handlers = {
  39     nodeAttrChange: function(event) {
  40         if(event.meta.attr === 'class') {
  41             var canvasNode = utils.findCanvasElement(event.meta.node);
  42             canvasNode.setWlxmlClass(event.meta.newVal);
  43         }
  44     },
  45     nodeTagChange: function(event) {
  46         var canvasNode = utils.findCanvasElement(event.meta.node);
  47         canvasNode.setWlxmlTag(event.meta.newTagName);
  48         canvasNode.wlxmlNode = event.meta.node;
  49     },
  50     nodeAdded: function(event, checkForExistence) {
  51         if(event.meta.node.isRoot()) {
  52             this.canvas.reloadRoot();
  53             return;
  54         }
  55         var parentElement = utils.findCanvasElement(event.meta.node.parent()),
  56             nodeIndex = event.meta.node.getIndex(),
  57             referenceElement, referenceAction, actionArg;
  58
  59         if(nodeIndex === 0) {
  60             referenceElement = parentElement;
  61             referenceAction = 'prepend';
  62         } else {
  63             referenceElement = parentElement.children()[nodeIndex-1];
  64             referenceAction = 'after';
  65         }
  66
  67         actionArg = (checkForExistence && utils.findCanvasElement(event.meta.node, event.meta.parent)) || event.meta.node;
  68         referenceElement[referenceAction](actionArg);
  69     },
  70     nodeMoved: function(event) {
  71         return handlers.nodeAdded.call(this, event, true);
  72     },
  73     nodeDetached: function(event) {
  74         var canvasNode = utils.findCanvasElementInParent(event.meta.node, event.meta.parent);
  75         canvasNode.detach();
  76     },
  77     nodeTextChange: function(event) {
  78         //console.log('wlxmlListener: ' + event.meta.node.getText());
  79         var canvasElement = utils.findCanvasElement(event.meta.node),
  80             toSet = event.meta.node.getText();
  81         if(toSet === '') {
  82             toSet = utils.unicode.ZWS;
  83         }
  84         if(toSet !== canvasElement.getText()) {
  85             canvasElement.setText(toSet);
  86         }
  87     },
  88
  89     metadataChanged: _metadataEventHandler,
  90     metadataAdded: _metadataEventHandler,
  91     metadataRemoved: _metadataEventHandler
  92 };
  93
  94 return {
  95     create: function(canvas) {
  96         return new Listener(canvas);
  97     }
  98 };
  99
 100 });