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define([

'dojo/_base/declare',

'dijit/_WidgetBase',

'dojo/topic',

'dojo/_base/array',

'dojo/_base/lang'

], function (

declare,

_WidgetBase,

topic,

array,

lang

) {

return declare([_WidgetBase], {

map: true,

// array of IDs for layers that can be toggled

layerGroup: [],

// ID of labels layer (if any)

labelsID: null,

postCreate: function () {

this.inherited(arguments);

topic.subscribe('layerControl/layerToggle', lang.hitch(this, function (r) {

if (array.indexOf(this.layerGroup, r.id) >= 0) {

array.forEach(this.layerGroup, lang.hitch(this, function (id) {

if (id !== r.id) {

var lyr = this.map.getLayer(id);

if (lyr) {

lyr.setVisibility(false);

}

}

}));

}

}));

}

});

});