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CallbackQueue.js
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96 lines (84 loc) · 2.31 KB
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/**
* Copyright 2013-2014, Facebook, Inc.
* All rights reserved.
*
* This source code is licensed under the BSD-style license found in the
* LICENSE file in the root directory of this source tree. An additional grant
* of patent rights can be found in the PATENTS file in the same directory.
*
* @providesModule CallbackQueue
*/
"use strict";
var PooledClass = require('PooledClass');
var assign = require('Object.assign');
var invariant = require('invariant');
/**
* A specialized pseudo-event module to help keep track of components waiting to
* be notified when their DOM representations are available for use.
*
* This implements `PooledClass`, so you should never need to instantiate this.
* Instead, use `CallbackQueue.getPooled()`.
*
* @class ReactMountReady
* @implements PooledClass
* @internal
*/
function CallbackQueue() {
this._callbacks = null;
this._contexts = null;
}
assign(CallbackQueue.prototype, {
/**
* Enqueues a callback to be invoked when `notifyAll` is invoked.
*
* @param {function} callback Invoked when `notifyAll` is invoked.
* @param {?object} context Context to call `callback` with.
* @internal
*/
enqueue: function(callback, context) {
this._callbacks = this._callbacks || [];
this._contexts = this._contexts || [];
this._callbacks.push(callback);
this._contexts.push(context);
},
/**
* Invokes all enqueued callbacks and clears the queue. This is invoked after
* the DOM representation of a component has been created or updated.
*
* @internal
*/
notifyAll: function() {
var callbacks = this._callbacks;
var contexts = this._contexts;
if (callbacks) {
invariant(
callbacks.length === contexts.length,
"Mismatched list of contexts in callback queue"
);
this._callbacks = null;
this._contexts = null;
for (var i = 0, l = callbacks.length; i < l; i++) {
callbacks[i].call(contexts[i]);
}
callbacks.length = 0;
contexts.length = 0;
}
},
/**
* Resets the internal queue.
*
* @internal
*/
reset: function() {
this._callbacks = null;
this._contexts = null;
},
/**
* `PooledClass` looks for this.
*/
destructor: function() {
this.reset();
}
});
PooledClass.addPoolingTo(CallbackQueue);
module.exports = CallbackQueue;