react-native/Libraries/Components/StaticContainer.js

/**
 * @generated SignedSource<<2a163cdb088fb963f941e627fd89ce11>>
 *
 * !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
 * !! This file is a check-in of a static_upstream project!      !!
 * !!                                                            !!
 * !! You should not modify this file directly. Instead:         !!
 * !! 1) Use `fjs use-upstream` to temporarily replace this with !!
 * !!    the latest version from upstream.                       !!
 * !! 2) Make your changes, test them, etc.                      !!
 * !! 3) Use `fjs push-upstream` to copy your changes back to    !!
 * !!    static_upstream.                                        !!
 * !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
 *
 * Copyright 2004-present Facebook. All Rights Reserved.
 *
 * @providesModule StaticContainer.react
 * @typechecks
 * @flow
 */

var React = require('React');

var onlyChild = require('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;