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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
/**
* A mixin to forward events to on* methods if defined.
*
* @param {string} superclass The class to extend.
* @returns {class}
*/
export default function HandleEventMixin(superclass) {
return class HandleEvent extends superclass {
handleEvent(evt) {
function capitalize(str) {
return str.charAt(0).toUpperCase() + str.slice(1);
}
if (super.handleEvent) {
super.handleEvent(evt);
}
// Check whether event name is a defined function in object.
let fn = "on" + capitalize(evt.type);
if (this[fn] && typeof this[fn] === "function") {
return this[fn](evt);
}
return null;
}
};
}
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