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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,
"use strict";
/**
* Helper class to disable panel rendering when it is in background.
*
* Toolbox code hides the iframes when switching to another panel
* and triggers `visibilitychange` events.
*
* See devtools/client/framework/toolbox.js:setIframeVisible().
*/
const {
Component,
class VisibilityHandler extends Component {
static get propTypes() {
return {
children: PropTypes.element.isRequired,
};
}
constructor(props) {
super(props);
this.onVisibilityChange = this.onVisibilityChange.bind(this);
}
componentDidMount() {
document.addEventListener("visibilitychange", this.onVisibilityChange);
}
shouldComponentUpdate() {
return document.visibilityState == "visible";
}
componentWillUnmount() {
document.removeEventListener("visibilitychange", this.onVisibilityChange);
}
onVisibilityChange() {
if (document.visibilityState == "visible") {
this.forceUpdate();
}
}
render() {
return this.props.children;
}
}
module.exports = VisibilityHandler;