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     nodeAdded: function(event, checkForExistence) {
  46         if(event.meta.node.isRoot()) {
  47             this.canvas.reloadRoot();
  48             return;
  49         }
  50         var parentElement = utils.findCanvasElement(event.meta.node.parent()),
  51             nodeIndex = event.meta.node.getIndex(),
  52             referenceElement, referenceAction, actionArg;
  53
  54         if(nodeIndex === 0) {
  55             referenceElement = parentElement;
  56             referenceAction = 'prepend';
  57         } else {
  58             referenceElement = parentElement.children()[nodeIndex-1];
  59             referenceAction = 'after';
  60         }
  61
  62         actionArg = (checkForExistence && utils.findCanvasElement(event.meta.node, event.meta.parent)) || event.meta.node;
  63         referenceElement[referenceAction](actionArg);
  64     },
  65     nodeMoved: function(event) {
  66         return handlers.nodeAdded.call(this, event, true);
  67     },
  68     nodeDetached: function(event) {
  69         var canvasNode = utils.findCanvasElementInParent(event.meta.node, event.meta.parent);
  70         canvasNode.detach();
  71     },
  72     nodeTextChange: function(event) {
  73         //console.log('wlxmlListener: ' + event.meta.node.getText());
  74         var canvasElement = utils.findCanvasElement(event.meta.node),
  75             toSet = event.meta.node.getText();
  76         if(toSet === '') {
  77             toSet = utils.unicode.ZWS;
  78         }
  79         if(toSet !== canvasElement.getText()) {
  80             canvasElement.setText(toSet);
  81         }
  82     },
  83
  84     metadataChanged: _metadataEventHandler,
  85     metadataAdded: _metadataEventHandler,
  86     metadataRemoved: _metadataEventHandler
  87 };
  88
  89 return {
  90     create: function(canvas) {
  91         return new Listener(canvas);
  92     }
  93 };
  94
  95 });