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Initial implementation of new-style refs
cf. #1373 This implementation can be used in any situation that refs can currently be used (and can also be used without an owner, which is a plus).
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/** | ||
* Copyright 2013-2014 Facebook, Inc. | ||
* | ||
* Licensed under the Apache License, Version 2.0 (the "License"); | ||
* you may not use this file except in compliance with the License. | ||
* You may obtain a copy of the License at | ||
* | ||
* http://www.apache.org/licenses/LICENSE-2.0 | ||
* | ||
* Unless required by applicable law or agreed to in writing, software | ||
* distributed under the License is distributed on an "AS IS" BASIS, | ||
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
* See the License for the specific language governing permissions and | ||
* limitations under the License. | ||
* | ||
* @providesModule ReactRef | ||
*/ | ||
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"use strict"; | ||
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var ReactUpdates = require('ReactUpdates'); | ||
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var accumulate = require('accumulate'); | ||
var assign = require('Object.assign'); | ||
var forEachAccumulated = require('forEachAccumulated'); | ||
var invariant = require('invariant'); | ||
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function ReactRef() { | ||
this._value = null; | ||
this._successCallbacks = null; | ||
this._failureCallbacks = null; | ||
} | ||
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/** | ||
* Call the enqueued success or failure callbacks for a ref, as appropriate. | ||
*/ | ||
function dispatchCallbacks() { | ||
/*jshint validthis:true */ | ||
var successCallbacks = this._successCallbacks; | ||
var failureCallbacks = this._failureCallbacks; | ||
this._successCallbacks = null; | ||
this._failureCallbacks = null; | ||
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if (this._value) { | ||
forEachAccumulated(successCallbacks, callSuccess, this); | ||
} else { | ||
forEachAccumulated(failureCallbacks, callFailure); | ||
} | ||
} | ||
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/** | ||
* Call a single success callback, passing the ref's value. | ||
*/ | ||
function callSuccess(cb) { | ||
/*jshint validthis:true */ | ||
cb(this._value); | ||
} | ||
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/** | ||
* Call a single failure callback, passing no arguments. | ||
*/ | ||
function callFailure(cb) { | ||
cb(); | ||
} | ||
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assign(ReactRef.prototype, { | ||
/** | ||
* Get the value of a ref asynchronously. Accepts a success callback and an | ||
* optional failure callback. If the ref has been rendered, the success | ||
* callback will be called with the component instance; otherwise, the failure | ||
* callback will be executed. | ||
* | ||
* @param {function} success Callback in case of success | ||
* @param {?function} failure Callback in case of failure | ||
*/ | ||
then: function(success, failure) { | ||
invariant( | ||
typeof success === 'function', | ||
'ReactRef.then(...): Must provide a success callback.' | ||
); | ||
if (this._successCallbacks == null) { | ||
ReactUpdates.asap(dispatchCallbacks, this); | ||
} | ||
this._successCallbacks = accumulate(this._successCallbacks, success); | ||
if (failure) { | ||
this._failureCallbacks = accumulate(this._failureCallbacks, failure); | ||
} | ||
} | ||
}); | ||
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ReactRef.attachRef = function(ref, value) { | ||
ref._value = value; | ||
}; | ||
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ReactRef.detachRef = function(ref, value) { | ||
// Check that `component` is still the current ref because we do not want to | ||
// detach the ref if another component stole it. | ||
if (ref._value === value) { | ||
ref._value = null; | ||
} | ||
}; | ||
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module.exports = ReactRef; |
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