77 lines
1.9 KiB
JavaScript
77 lines
1.9 KiB
JavaScript
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/**
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* Copyright (c) 2015-present, 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 AccessibilityInfo
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* @flow
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*/
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'use strict';
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var NativeModules = require('NativeModules');
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var RCTDeviceEventEmitter = require('RCTDeviceEventEmitter');
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var RCTAccessibilityInfo = NativeModules.AccessibilityInfo;
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var TOUCH_EXPLORATION_EVENT = 'touchExplorationDidChange';
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type ChangeEventName = $Enum<{
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change: string,
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}>;
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var _subscriptions = new Map();
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/**
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* Sometimes it's useful to know whether or not the device has a screen reader
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* that is currently active. The `AccessibilityInfo` API is designed for this
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* purpose. You can use it to query the current state of the screen reader as
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* well as to register to be notified when the state of the screen reader
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* changes.
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*
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* See http://facebook.github.io/react-native/docs/accessibilityinfo.html
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*/
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var AccessibilityInfo = {
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fetch: function(): Promise {
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return new Promise((resolve, reject) => {
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RCTAccessibilityInfo.isTouchExplorationEnabled(
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function(resp) {
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resolve(resp);
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}
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);
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});
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},
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addEventListener: function (
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eventName: ChangeEventName,
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handler: Function
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): void {
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var listener = RCTDeviceEventEmitter.addListener(
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TOUCH_EXPLORATION_EVENT,
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(enabled) => {
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handler(enabled);
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}
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);
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_subscriptions.set(handler, listener);
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},
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removeEventListener: function(
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eventName: ChangeEventName,
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handler: Function
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): void {
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var listener = _subscriptions.get(handler);
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if (!listener) {
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return;
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}
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listener.remove();
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_subscriptions.delete(handler);
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},
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};
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module.exports = AccessibilityInfo;
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