107 lines
2.6 KiB
JavaScript
107 lines
2.6 KiB
JavaScript
/**
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* Copyright (c) 2015-present, Facebook, Inc.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*
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* @format
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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 {AppState, Text, View} = ReactNative;
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class AppStateSubscription extends React.Component<
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$FlowFixMeProps,
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$FlowFixMeState,
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> {
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state = {
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appState: AppState.currentState,
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previousAppStates: [],
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memoryWarnings: 0,
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};
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componentDidMount() {
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AppState.addEventListener('change', this._handleAppStateChange);
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AppState.addEventListener('memoryWarning', this._handleMemoryWarning);
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}
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componentWillUnmount() {
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AppState.removeEventListener('change', this._handleAppStateChange);
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AppState.removeEventListener('memoryWarning', this._handleMemoryWarning);
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}
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_handleMemoryWarning = () => {
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this.setState({memoryWarnings: this.state.memoryWarnings + 1});
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};
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_handleAppStateChange = appState => {
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var previousAppStates = this.state.previousAppStates.slice();
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previousAppStates.push(this.state.appState);
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this.setState({
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appState,
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previousAppStates,
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});
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};
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render() {
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if (this.props.showMemoryWarnings) {
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return (
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<View>
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<Text>{this.state.memoryWarnings}</Text>
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</View>
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);
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}
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if (this.props.showCurrentOnly) {
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return (
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<View>
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<Text>{this.state.appState}</Text>
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</View>
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);
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}
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return (
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<View>
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<Text>{JSON.stringify(this.state.previousAppStates)}</Text>
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</View>
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);
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}
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}
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exports.title = 'AppState';
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exports.description = 'app background status';
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exports.examples = [
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{
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title: 'AppState.currentState',
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description: 'Can be null on app initialization',
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render() {
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return <Text>{AppState.currentState}</Text>;
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},
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},
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{
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title: 'Subscribed AppState:',
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description:
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'This changes according to the current state, so you can only ever see it rendered as "active"',
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render(): React.Element<any> {
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return <AppStateSubscription showCurrentOnly={true} />;
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},
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},
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{
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title: 'Previous states:',
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render(): React.Element<any> {
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return <AppStateSubscription showCurrentOnly={false} />;
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},
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},
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{
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platform: 'ios',
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title: 'Memory Warnings',
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description:
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'In the IOS simulator, hit Shift+Command+M to simulate a memory warning.',
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render(): React.Element<any> {
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return <AppStateSubscription showMemoryWarnings={true} />;
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},
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},
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];
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