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f07ca31303
Summary: Similar to iOS, send device orientation changes events. This does not have the `getCurrentOrientation` method, because it's not used. If necessary, we'll add it separately. This also adds a simple example for testing. We listen to orientation changes in `onGlobalLayout`, and check if the rotation of the device has changed. If it has, we emit the event. But: - `onGlobalLayout` (and `onConfigurationChanged` - which is the method usually used for checking for device orientation changes) is *not* called when the device goes from landscape to reverse landscape (same with portrait), as that is not a relayout / configuration change. We could detect if this happens with the help of an `OrientationEventListener`. However, this listener notifies you if the degree of the phone changes by a single degree, which means that you need to know by how many degrees the phone needs to change in order for the orientation to change. I haven't looked into how accurate this could be, but I suspect that in practice it would cause a lot of bugs. A simple `abgs` and google search reveals that everybody uses a different margin for detecting a rotation change (from 30 to 45 degrees), so I suspect that this won't work as expected in practice. Therefore, we're not using this here, and we're sticking to what android provides via `onConfigurationChanged`. If we find that we have issues because users need to know when the user goes from landscape to reverse landscape, then we'll have to revisit this. Reviewed By: foghina Differential Revision: D3797521 fbshipit-source-id: 62508efd342a9a4b41b42b6138c73553cfdefebc
81 lines
2.2 KiB
JavaScript
81 lines
2.2 KiB
JavaScript
/**
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* Copyright (c) 2013-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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* The examples provided by Facebook are for non-commercial testing and
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* evaluation purposes only.
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*
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* Facebook reserves all rights not expressly granted.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NON INFRINGEMENT. IN NO EVENT SHALL
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* FACEBOOK BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
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* AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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* @providesModule OrientationChangeExample
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* @flow
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*/
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'use strict';
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const React = require('react');
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const ReactNative = require('react-native');
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const {
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DeviceEventEmitter,
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Text,
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View,
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} = ReactNative;
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import type EmitterSubscription from 'EmitterSubscription';
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class OrientationChangeExample extends React.Component {
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_orientationSubscription: EmitterSubscription;
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state = {
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currentOrientation: '',
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orientationDegrees: 0,
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isLandscape: false,
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};
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componentDidMount() {
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this._orientationSubscription = DeviceEventEmitter.addListener(
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'namedOrientationDidChange', this._onOrientationChange,
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);
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}
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componentWillUnmount() {
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this._orientationSubscription.remove();
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}
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_onOrientationChange = (orientation: Object) => {
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this.setState({
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currentOrientation: orientation.name,
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orientationDegrees: orientation.rotationDegrees,
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isLandscape: orientation.isLandscape,
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});
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}
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render() {
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return (
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<View>
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<Text>{JSON.stringify(this.state)}</Text>
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</View>
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);
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}
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}
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exports.title = 'OrientationChangeExample';
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exports.description = 'listening to orientation changes';
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exports.examples = [
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{
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title: 'OrientationChangeExample',
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description: 'listening to device orientation changes',
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render() { return <OrientationChangeExample />; },
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},
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];
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