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72 lines
2.0 KiB
72 lines
2.0 KiB
10 years ago
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/**
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* Copyright 2013-2015, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD-style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*
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* @providesModule ReactLink
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* @typechecks static-only
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*/
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'use strict';
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/**
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* ReactLink encapsulates a common pattern in which a component wants to modify
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* a prop received from its parent. ReactLink allows the parent to pass down a
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* value coupled with a callback that, when invoked, expresses an intent to
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* modify that value. For example:
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*
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* React.createClass({
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* getInitialState: function() {
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* return {value: ''};
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* },
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* render: function() {
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* var valueLink = new ReactLink(this.state.value, this._handleValueChange);
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* return <input valueLink={valueLink} />;
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* },
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* this._handleValueChange: function(newValue) {
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* this.setState({value: newValue});
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* }
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* });
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*
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* We have provided some sugary mixins to make the creation and
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* consumption of ReactLink easier; see LinkedValueUtils and LinkedStateMixin.
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*/
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var React = require("./React");
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/**
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* @param {*} value current value of the link
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* @param {function} requestChange callback to request a change
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*/
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function ReactLink(value, requestChange) {
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this.value = value;
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this.requestChange = requestChange;
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}
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/**
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* Creates a PropType that enforces the ReactLink API and optionally checks the
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* type of the value being passed inside the link. Example:
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*
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* MyComponent.propTypes = {
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* tabIndexLink: ReactLink.PropTypes.link(React.PropTypes.number)
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* }
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*/
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function createLinkTypeChecker(linkType) {
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var shapes = {
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value: typeof linkType === 'undefined' ?
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React.PropTypes.any.isRequired :
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linkType.isRequired,
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requestChange: React.PropTypes.func.isRequired
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};
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return React.PropTypes.shape(shapes);
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}
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ReactLink.PropTypes = {
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link: createLinkTypeChecker
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};
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module.exports = ReactLink;
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