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75 lines
1.9 KiB
75 lines
1.9 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 ReactContext
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*/
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'use strict';
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var assign = require("./Object.assign");
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var emptyObject = require("./emptyObject");
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var warning = require("./warning");
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var didWarn = false;
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/**
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* Keeps track of the current context.
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*
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* The context is automatically passed down the component ownership hierarchy
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* and is accessible via `this.context` on ReactCompositeComponents.
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*/
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var ReactContext = {
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/**
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* @internal
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* @type {object}
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*/
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current: emptyObject,
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/**
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* Temporarily extends the current context while executing scopedCallback.
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*
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* A typical use case might look like
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*
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* render: function() {
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* var children = ReactContext.withContext({foo: 'foo'}, () => (
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*
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* ));
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* return <div>{children}</div>;
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* }
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*
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* @param {object} newContext New context to merge into the existing context
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* @param {function} scopedCallback Callback to run with the new context
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* @return {ReactComponent|array<ReactComponent>}
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*/
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withContext: function(newContext, scopedCallback) {
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if ("production" !== process.env.NODE_ENV) {
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("production" !== process.env.NODE_ENV ? warning(
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didWarn,
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'withContext is deprecated and will be removed in a future version. ' +
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'Use a wrapper component with getChildContext instead.'
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) : null);
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didWarn = true;
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}
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var result;
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var previousContext = ReactContext.current;
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ReactContext.current = assign({}, previousContext, newContext);
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try {
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result = scopedCallback();
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} finally {
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ReactContext.current = previousContext;
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}
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return result;
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}
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};
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module.exports = ReactContext;
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