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