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a2524bac33
Reviewed By: fkgozali Differential Revision: D2525434 fb-gh-sync-id: 18e7d672b2cbadc318a207c8812f38d8669bad30
112 lines
3.6 KiB
JavaScript
112 lines
3.6 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 NavigationContext
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*/
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'use strict';
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var NavigationEventEmitter = require('NavigationEventEmitter');
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var NavigationTreeNode = require('NavigationTreeNode');
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var emptyFunction = require('emptyFunction');
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var invariant = require('invariant');
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import type * as NavigationEvent from 'NavigationEvent';
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import type * as EventSubscription from 'EventSubscription';
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/**
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* Class that contains the info and methods for app navigation.
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*/
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class NavigationContext {
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__node: NavigationTreeNode;
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_eventEmitter: ?NavigationEventEmitter;
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_currentRoute: any;
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constructor() {
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this._eventEmitter = new NavigationEventEmitter(this);
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this._currentRoute = null;
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// Sets the protected property `__node`.
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this.__node = new NavigationTreeNode(this);
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this.addListener('willfocus', this._onFocus, this);
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this.addListener('didfocus', this._onFocus, this);
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}
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/* $FlowFixMe - get/set properties not yet supported */
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get parent(): ?NavigationContext {
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var parent = this.__node.getParent();
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return parent ? parent.getValue() : null;
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}
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/* $FlowFixMe - get/set properties not yet supported */
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get currentRoute(): any {
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return this._currentRoute;
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}
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appendChild(childContext: NavigationContext): void {
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this.__node.appendChild(childContext.__node);
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}
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addListener(
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eventType: string,
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listener: Function,
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context: ?Object
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): EventSubscription {
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var emitter = this._eventEmitter;
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if (emitter) {
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return emitter.addListener(eventType, listener, context);
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} else {
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return {remove: emptyFunction};
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}
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}
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emit(eventType: String, data: any, didEmitCallback: ?Function): void {
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var emitter = this._eventEmitter;
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if (emitter) {
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emitter.emit(eventType, data, didEmitCallback);
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}
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}
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dispose(): void {
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var emitter = this._eventEmitter;
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if (emitter) {
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// clean up everything.
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emitter.removeAllListeners();
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this._eventEmitter = null;
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this._currentRoute = null;
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}
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}
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_onFocus(event: NavigationEvent): void {
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invariant(
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event.data && event.data.hasOwnProperty('route'),
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'didfocus event should provide route'
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);
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this._currentRoute = event.data.route;
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}
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}
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module.exports = NavigationContext;
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