107 lines
3.3 KiB
JavaScript
107 lines
3.3 KiB
JavaScript
/**
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* Copyright (c) 2015, Facebook, Inc. All rights reserved.
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*
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* Facebook, Inc. ("Facebook") owns all right, title and interest, including
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* all intellectual property and other proprietary rights, in and to the React
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* Native CustomComponents software (the "Software"). Subject to your
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* compliance with these terms, you are hereby granted a non-exclusive,
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* worldwide, royalty-free copyright license to (1) use and copy the Software;
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* and (2) reproduce and distribute the Software as part of your own software
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* ("Your Software"). Facebook reserves all rights not expressly granted to
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* you in this license agreement.
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*
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* THE SOFTWARE AND DOCUMENTATION, IF ANY, ARE PROVIDED "AS IS" AND ANY EXPRESS
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* OR IMPLIED WARRANTIES (INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE) ARE DISCLAIMED.
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* IN NO EVENT SHALL FACEBOOK OR ITS AFFILIATES, OFFICERS, DIRECTORS OR
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* EMPLOYEES BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THE SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* @providesModule NavigationEventEmitter
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* @flow
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*/
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'use strict';
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var EventEmitter = require('EventEmitter');
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var NavigationEvent = require('NavigationEvent');
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type ExtraInfo = {
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defaultPrevented: ?boolean,
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eventPhase: ?number,
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propagationStopped: ?boolean,
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target: ?Object,
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};
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class NavigationEventEmitter extends EventEmitter {
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_emitQueue: Array<any>;
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_emitting: boolean;
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_target: Object;
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constructor(target: Object) {
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super();
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this._emitting = false;
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this._emitQueue = [];
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this._target = target;
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}
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emit(
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eventType: string,
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data: any,
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didEmitCallback: ?Function,
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extraInfo: ?ExtraInfo
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): void {
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if (this._emitting) {
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// An event cycle that was previously created hasn't finished yet.
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// Put this event cycle into the queue and will finish them later.
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var args: any = Array.prototype.slice.call(arguments);
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this._emitQueue.unshift(args);
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return;
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}
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this._emitting = true;
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var event = NavigationEvent.pool(eventType, this._target, data);
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if (extraInfo) {
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if (extraInfo.target) {
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event.target = extraInfo.target;
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}
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if (extraInfo.eventPhase) {
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event.eventPhase = extraInfo.eventPhase;
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}
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if (extraInfo.defaultPrevented) {
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event.preventDefault();
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}
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if (extraInfo.propagationStopped) {
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event.stopPropagation();
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}
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}
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// EventEmitter#emit only takes `eventType` as `String`. Casting `eventType`
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// to `String` to make @flow happy.
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super.emit(String(eventType), event);
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if (typeof didEmitCallback === 'function') {
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didEmitCallback.call(this._target, event);
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}
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event.dispose();
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this._emitting = false;
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while (this._emitQueue.length) {
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var args: any = this._emitQueue.shift();
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this.emit.apply(this, args);
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}
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}
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}
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module.exports = NavigationEventEmitter;
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