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// Copyright 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
/**
* @fileoverview Behavior to be used by Polymer elements that want to
* automatically remove WebUI listeners when detached.
*/
/** @polymerBehavior */
var WebUIListenerBehavior = {
properties: {
/**
* Holds WebUI listeners that need to be removed when this element is
* destroyed.
* @private {!Array<!WebUIListener>}
*/
webUIListeners_: {
type: Array,
value: function() { return []; },
},
},
/**
* Adds a WebUI listener and registers it for automatic removal when this
* element is detached.
* Note: Do not use this method if you intend to remove this listener
* manually (use cr.addWebUIListener directly instead).
*
* @param {string} eventName The event to listen to.
* @param {!Function} callback The callback run when the event is fired.
*/
addWebUIListener: function(eventName, callback) {
this.webUIListeners_.push(cr.addWebUIListener(eventName, callback));
},
/** @override */
detached: function() {
while (this.webUIListeners_.length > 0) {
cr.removeWebUIListener(this.webUIListeners_.pop());
}
},
};
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