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 var handlers = {
  33     nodeAttrChange: function(event) {
  34         if(event.meta.attr === 'class') {
  35             var canvasNode = utils.findCanvasElement(event.meta.node);
  36             canvasNode.setWlxmlClass(event.meta.newVal);
  37         }
  38     },
  39     nodeTagChange: function(event) {
  40         var canvasNode = utils.findCanvasElement(event.meta.node);
  41         canvasNode.setWlxmlTag(event.meta.newTagName);
  42         canvasNode.data('wlxmlNode', event.meta.node);
  43     },
  44     nodeAdded: function(event, checkForExistence) {
  45         if(event.meta.node.isRoot()) {
  46             this.canvas.reloadRoot();
  47             return;
  48         }
  49         var parentElement = utils.findCanvasElement(event.meta.node.parent()),
  50             nodeIndex = event.meta.node.getIndex(),
  51             referenceElement, referenceAction, actionArg;
  52
  53         if(nodeIndex === 0) {
  54             referenceElement = parentElement;
  55             referenceAction = 'prepend';
  56         } else {
  57             referenceElement = parentElement.children()[nodeIndex-1];
  58             referenceAction = 'after';
  59         }
  60
  61         actionArg = (checkForExistence && utils.findCanvasElement(event.meta.node)) || event.meta.node;
  62         referenceElement[referenceAction](actionArg);
  63     },
  64     nodeMoved: function(event) {
  65         return handlers.nodeAdded(event, true);
  66     },
  67     nodeDetached: function(event) {
  68         var canvasNode = utils.findCanvasElementInParent(event.meta.node, event.meta.parent);
  69         canvasNode.detach();
  70     },
  71     nodeTextChange: function(event) {
  72         //console.log('wlxmlListener: ' + event.meta.node.getText());
  73         var canvasElement = utils.findCanvasElement(event.meta.node),
  74             toSet = event.meta.node.getText();
  75         if(toSet === '') {
  76             toSet = utils.unicode.ZWS;
  77         }
  78         if(toSet !== canvasElement.getText()) {
  79             canvasElement.setText(toSet);
  80         }
  81     }
  82 };
  83
  84 return {
  85     create: function(canvas) {
  86         return new Listener(canvas);
  87     }
  88 };
  89
  90 });