react-native/Libraries/Components/StaticContainer.js

47 lines
1.3 KiB
JavaScript

/**
* Copyright (c) 2015-present, Facebook, Inc.
* All rights reserved.
*
* This source code is licensed under the BSD-style license found in the
* LICENSE file in the root directory of this source tree. An additional grant
* of patent rights can be found in the PATENTS file in the same directory.
*
* @providesModule StaticContainer.react
* @flow
*/
'use strict';
var React = require('React');
var onlyChild = require('react/lib/onlyChild');
/**
* Renders static content efficiently by allowing React to short-circuit the
* reconciliation process. This component should be used when you know that a
* subtree of components will never need to be updated.
*
* var someValue = ...; // We know for certain this value will never change.
* return (
* <StaticContainer>
* <MyComponent value={someValue} />
* </StaticContainer>
* );
*
* Typically, you will not need to use this component and should opt for normal
* React reconciliation.
*/
class StaticContainer extends React.Component {
shouldComponentUpdate(nextProps: Object): boolean {
return !!nextProps.shouldUpdate;
}
render() {
var child = this.props.children;
return (child === null || child === false) ? null : onlyChild(child);
}
}
module.exports = StaticContainer;