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<!--
@license
Copyright (c) 2017 The Polymer Project Authors. All rights reserved.
This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
Code distributed by Google as part of the polymer project is also
subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
-->
<link rel="import" href="../utils/boot.html">
<link rel="import" href="../utils/mixin.html">
<link rel="import" href="../utils/gestures.html">
<script>
(function() {
'use strict';
/**
* @const {Polymer.Gestures}
*/
const gestures = Polymer.Gestures;
/**
* Element class mixin that provides API for adding Polymer's cross-platform
* gesture events to nodes.
*
* The API is designed to be compatible with override points implemented
* in `Polymer.TemplateStamp` such that declarative event listeners in
* templates will support gesture events when this mixin is applied along with
* `Polymer.TemplateStamp`.
*
* @mixinFunction
* @polymer
* @memberof Polymer
* @summary Element class mixin that provides API for adding Polymer's cross-platform
* gesture events to nodes
*/
Polymer.GestureEventListeners = Polymer.dedupingMixin(superClass => {
/**
* @polymer
* @mixinClass
* @implements {Polymer_GestureEventListeners}
*/
class GestureEventListeners extends superClass {
/**
* Add the event listener to the node if it is a gestures event.
*
* @param {!Node} node Node to add event listener to
* @param {string} eventName Name of event
* @param {function(!Event):void} handler Listener function to add
* @return {void}
*/
_addEventListenerToNode(node, eventName, handler) {
if (!gestures.addListener(node, eventName, handler)) {
super._addEventListenerToNode(node, eventName, handler);
}
}
/**
* Remove the event listener to the node if it is a gestures event.
*
* @param {!Node} node Node to remove event listener from
* @param {string} eventName Name of event
* @param {function(!Event):void} handler Listener function to remove
* @return {void}
*/
_removeEventListenerFromNode(node, eventName, handler) {
if (!gestures.removeListener(node, eventName, handler)) {
super._removeEventListenerFromNode(node, eventName, handler);
}
}
}
return GestureEventListeners;
});
})();
</script>
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