mirror of
https://github.com/facebook/react-native.git
synced 2025-11-01 09:14:26 +00:00
Rubén Norte
80ce3c7fe2
Summary: In development, we can specify a debug name to force the whole React tree to have a meaningful name. This is useful for debugging: React DevTools, component stack traces, etc. More context in D26637787 (https://github.com/facebook/react-native/commit/eeb36f470929c2fdd8e1ed69898a5ba9144b8715). This worked fine until now because `renderApplication` is never called more than once per React Native root. With pre-rendering, this won't be true as we'll be able to re-render the whole React tree with new props (after navigating to the screen). The problem with the current implementation is that we generate a new component every time `renderApplication` is called, which makes the React reconciliation consider them different components and discards the whole sub-tree. This fixes it by caching those components so we always return a component with the same identity (exactly the same function) when we call `renderApplication` repeatedly. This won't have any effect in production where these components aren't created at all. Changelog: [Internal] Reviewed By: ShikaSD Differential Revision: D28061384 fbshipit-source-id: 95833a5b74bb622896cb47426f74324d8740e5d7
77 lines
2.5 KiB
JavaScript
77 lines
2.5 KiB
JavaScript
/**
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* Copyright (c) Facebook, Inc. and its affiliates.
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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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const AppContainer = require('./AppContainer');
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import GlobalPerformanceLogger from '../Utilities/GlobalPerformanceLogger';
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import type {IPerformanceLogger} from '../Utilities/createPerformanceLogger';
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import PerformanceLoggerContext from '../Utilities/PerformanceLoggerContext';
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import type {DisplayModeType} from './DisplayMode';
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import getCachedComponentWithDebugName from './getCachedComponentWithDebugName';
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const React = require('react');
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const invariant = require('invariant');
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// require BackHandler so it sets the default handler that exits the app if no listeners respond
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require('../Utilities/BackHandler');
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function renderApplication<Props: Object>(
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RootComponent: React.ComponentType<Props>,
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initialProps: Props,
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rootTag: any,
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WrapperComponent?: ?React.ComponentType<*>,
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fabric?: boolean,
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showArchitectureIndicator?: boolean,
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scopedPerformanceLogger?: IPerformanceLogger,
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isLogBox?: boolean,
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debugName?: string,
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displayMode?: ?DisplayModeType,
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) {
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invariant(rootTag, 'Expect to have a valid rootTag, instead got ', rootTag);
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const performanceLogger = scopedPerformanceLogger ?? GlobalPerformanceLogger;
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let renderable = (
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<PerformanceLoggerContext.Provider value={performanceLogger}>
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<AppContainer
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rootTag={rootTag}
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fabric={fabric}
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showArchitectureIndicator={showArchitectureIndicator}
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WrapperComponent={WrapperComponent}
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initialProps={initialProps ?? Object.freeze({})}
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internal_excludeLogBox={isLogBox}>
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<RootComponent {...initialProps} rootTag={rootTag} />
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</AppContainer>
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</PerformanceLoggerContext.Provider>
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);
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if (__DEV__ && debugName) {
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const RootComponentWithMeaningfulName = getCachedComponentWithDebugName(
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`${debugName}(RootComponent)`,
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);
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renderable = (
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<RootComponentWithMeaningfulName>
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{renderable}
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</RootComponentWithMeaningfulName>
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);
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}
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performanceLogger.startTimespan('renderApplication_React_render');
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performanceLogger.setExtra('usedReactFabric', fabric ? '1' : '0');
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if (fabric) {
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require('../Renderer/shims/ReactFabric').render(renderable, rootTag);
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} else {
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require('../Renderer/shims/ReactNative').render(renderable, rootTag);
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}
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performanceLogger.stopTimespan('renderApplication_React_render');
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}
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module.exports = renderApplication;
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