forked from mirrors/gecko-dev
1f830c96da
# ignore-this-changeset Differential Revision: https://phabricator.services.mozilla.com/D36042 --HG-- extra : source : d3afcafdce650a6f36cebbc126ee93b17f13cf52
28 lines
878 B
JavaScript
28 lines
878 B
JavaScript
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/**
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* A mixin to forward events to on* methods if defined.
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*
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* @param {string} superclass The class to extend.
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* @returns {class}
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*/
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export default function HandleEventMixin(superclass) {
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return class HandleEvent extends superclass {
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handleEvent(evt) {
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function capitalize(str) {
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return str.charAt(0).toUpperCase() + str.slice(1);
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}
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if (super.handleEvent) {
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super.handleEvent(evt);
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}
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// Check whether event name is a defined function in object.
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let fn = "on" + capitalize(evt.type);
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if (this[fn] && typeof this[fn] === "function") {
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return this[fn](evt);
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}
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return null;
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}
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};
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}
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