mirror of
https://github.com/facebook/react.git
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Paul O’Shannessy
96 lines
2.3 KiB
JavaScript
96 lines
2.3 KiB
JavaScript
/**
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* Copyright 2013-2014, 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 CallbackQueue
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*/
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"use strict";
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var PooledClass = require('PooledClass');
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var invariant = require('invariant');
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/**
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* A specialized pseudo-event module to help keep track of components waiting to
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* be notified when their DOM representations are available for use.
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*
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* This implements `PooledClass`, so you should never need to instantiate this.
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* Instead, use `CallbackQueue.getPooled()`.
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*
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* @class ReactMountReady
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* @implements PooledClass
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* @internal
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*/
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function CallbackQueue() {
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this._callbacks = null;
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this._contexts = null;
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}
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Object.assign(CallbackQueue.prototype, {
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/**
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* Enqueues a callback to be invoked when `notifyAll` is invoked.
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*
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* @param {function} callback Invoked when `notifyAll` is invoked.
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* @param {?object} context Context to call `callback` with.
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* @internal
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*/
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enqueue: function(callback, context) {
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this._callbacks = this._callbacks || [];
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this._contexts = this._contexts || [];
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this._callbacks.push(callback);
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this._contexts.push(context);
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},
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/**
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* Invokes all enqueued callbacks and clears the queue. This is invoked after
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* the DOM representation of a component has been created or updated.
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*
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* @internal
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*/
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notifyAll: function() {
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var callbacks = this._callbacks;
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var contexts = this._contexts;
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if (callbacks) {
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invariant(
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callbacks.length === contexts.length,
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"Mismatched list of contexts in callback queue"
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);
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this._callbacks = null;
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this._contexts = null;
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for (var i = 0, l = callbacks.length; i < l; i++) {
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callbacks[i].call(contexts[i]);
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}
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callbacks.length = 0;
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contexts.length = 0;
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}
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},
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/**
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* Resets the internal queue.
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*
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* @internal
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*/
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reset: function() {
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this._callbacks = null;
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this._contexts = null;
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},
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/**
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* `PooledClass` looks for this.
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*/
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destructor: function() {
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this.reset();
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}
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});
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PooledClass.addPoolingTo(CallbackQueue);
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module.exports = CallbackQueue;
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