mirror of
https://github.com/status-im/react-native.git
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52d8851fc8
Summary: In the context of an app an image exists in three resolutions on the server: `thumb` (30px) `feed` (300px) `full` (900px). When looking at an individual item a user can come either from the feed, via a permalink or from other parts of the app. This allows a situation where the `feed` image might or might not already be loaded somewhere in the app. In the detail view I want to render `thumb` with a blur (to quickly display something), then the `feed` image if it exists to have something decent to display until `full` loads. However it is quite a waste to load the `feed` image if it isn't already in cache, and will slow down the time until `full` is loaded. It is possible to track the navigation from feed->detail and that the `feed` image has actually completed loading by the feed component however as component hierarchies grow this turns into quite a lot of prop passing and bad separation of concerns. NSURLRequests accepts a [Cache Policy](https://developer.apple.com/reference/fo Closes https://github.com/facebook/react-native/pull/10844 Differential Revision: D4425959 Pulled By: lacker fbshipit-source-id: 679835439c761a2fc894f56eb6d744c036cf0b49
116 lines
3.3 KiB
JavaScript
116 lines
3.3 KiB
JavaScript
/**
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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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* @flow
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*/
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'use strict';
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var React = require('react');
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var ReactNative = require('react-native');
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var {
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Image,
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View,
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Text,
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StyleSheet,
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} = ReactNative;
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var { TestModule } = ReactNative.NativeModules;
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/*
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* The reload and force-cache tests don't actually verify that the complete functionality.
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*
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* reload: Should have the server set a long cache header, then swap the image on next load
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* with the test comparing the old image to the new image and making sure they are different.
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*
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* force-cache: Should do the above but set a no-cache header. The test should compare the first
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* image with the new one and make sure they are the same.
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*/
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const TESTS = ['only-if-cached', 'default', 'reload', 'force-cache'];
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type Props = {}
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type State = {
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'only-if-cached'?: boolean,
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'default'?: boolean,
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'reload'?: boolean,
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'force-cache'?: boolean,
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}
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class ImageCachePolicyTest extends React.Component {
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state = {}
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shouldComponentUpdate(nextProps: Props, nextState: State) {
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const results: Array<?boolean> = TESTS.map(x => nextState[x]);
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if (!results.includes(undefined)) {
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const result: boolean = results.reduce((x,y) => x === y === true, true)
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TestModule.markTestPassed(result);
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}
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return false;
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}
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testComplete(name: string, pass: boolean) {
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this.setState({[name]: pass});
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}
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render() {
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return (
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<View style={{flex: 1}}>
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<Text>Hello</Text>
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<Image
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source={{
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uri: 'https://facebook.github.io/react/img/logo_small_2x.png?cacheBust=notinCache' + Date.now(),
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cache: 'only-if-cached'
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}}
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onLoad={() => this.testComplete('only-if-cached', false)}
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onError={() => this.testComplete('only-if-cached', true)}
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style={styles.base}
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/>
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<Image
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source={{
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uri: 'https://facebook.github.io/react/img/logo_small_2x.png?cacheBust=notinCache' + Date.now(),
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cache: 'default'
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}}
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onLoad={() => this.testComplete('default', true)}
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onError={() => this.testComplete('default', false)}
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style={styles.base}
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/>
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<Image
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source={{
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uri: 'https://facebook.github.io/react/img/logo_small_2x.png?cacheBust=notinCache' + Date.now(),
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cache: 'reload'
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}}
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onLoad={() => this.testComplete('reload', true)}
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onError={() => this.testComplete('reload', false)}
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style={styles.base}
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/>
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<Image
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source={{
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uri: 'https://facebook.github.io/react/img/logo_small_2x.png?cacheBust=notinCache' + Date.now(),
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cache: 'force-cache'
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}}
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onLoad={() => this.testComplete('force-cache', true)}
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onError={() => this.testComplete('force-cache', false)}
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style={styles.base}
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/>
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</View>
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);
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}
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}
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const styles = StyleSheet.create({
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base: {
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width: 100,
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height: 100,
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},
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});
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ImageCachePolicyTest.displayName = 'ImageCachePolicyTest';
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module.exports = ImageCachePolicyTest;
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