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"experimental_layoutConformance" ViewProp -> "experimental_LayoutConf…
…ormance" component (facebook#48188) Summary: Pull Request resolved: facebook#48188 Yoga is full of bugs! Some of these bugs cannot be fixed without breaking large swaths of product code. To get around this, we introduced "errata" to Yoga as a mechanism to preserve bug compatibility, and an `experimental_layoutConformance` prop in React Native to create layout conformance contexts. This has allowed us to create more compliant layout behavior for XPR. This prop was originally designed as a context-like component, so you could set a conformance level at the root of your app, and individual components could change it for compatibility. This was difficult to achieve at the time, without introducing a primitive like `LayoutConformanceView`, which itself participated in the view tree. This prop has not been the desired end-goal, since it does not make clear that it is setting a whole new context, effecting children as well! Now that we've landed support for `display: contents`, we can achieve this desired API pretty easily. **Before** ``` import {View} from 'react-native'; // Root of the app <View {...props} experimental_layoutConformance="strict"> {content} </View> ``` **After** ``` import {View, experimental_LayoutConformance as LayoutConformance} from 'react-native'; // Root of the app <LayoutConformance mode="strict"> <View {...props}> {content} </View> </LayoutConformance> ``` Changelog: [Internal] Differential Revision: D66910054
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packages/react-native/Libraries/Components/LayoutConformance/LayoutConformance.d.ts
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| /** | ||
| * Copyright (c) Meta Platforms, Inc. and affiliates. | ||
| * | ||
| * This source code is licensed under the MIT license found in the | ||
| * LICENSE file in the root directory of this source tree. | ||
| * | ||
| * @format | ||
| */ | ||
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| import type * as React from 'react'; | ||
| import {HostInstance} from '../../../types/public/ReactNativeTypes'; | ||
| import {Constructor} from '../../../types/private/Utilities'; | ||
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| type LayoutConformanceProps = { | ||
| /** | ||
| * strict: Layout in accordance with W3C spec, even when breaking | ||
| * compatibility: Layout with the same behavior as previous versions of React Native | ||
| */ | ||
| mode: 'strict' | 'compatibility'; | ||
| children: React.ReactNode; | ||
| }; | ||
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| declare class LayoutConformanceComponent extends React.Component<LayoutConformanceProps> {} | ||
| declare const LayoutConformanceBase: Constructor<HostInstance> & | ||
| typeof LayoutConformanceComponent; | ||
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| /** | ||
| * Allows controlling the layout conformance/correctness behaviors of the subtree under this component. | ||
| */ | ||
| export class experimental_LayoutConformance extends LayoutConformanceBase {} |
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packages/react-native/Libraries/Components/LayoutConformance/LayoutConformance.js
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| /** | ||
| * Copyright (c) Meta Platforms, Inc. and affiliates. | ||
| * | ||
| * This source code is licensed under the MIT license found in the | ||
| * LICENSE file in the root directory of this source tree. | ||
| * | ||
| * @flow strict-local | ||
| * @format | ||
| * @oncall react_native | ||
| */ | ||
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| import StyleSheet from '../../StyleSheet/StyleSheet'; | ||
| import Text from '../../Text/Text'; | ||
| import UnimplementedView from '../UnimplementedViews/UnimplementedView'; | ||
| import LayoutConformanceNativeComponent from './LayoutConformanceNativeComponent'; | ||
| import React from 'react'; | ||
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| type Props = $ReadOnly<{ | ||
| /** | ||
| * strict: Layout in accordance with W3C spec, even when breaking | ||
| * compatibility: Layout with the same behavior as previous versions of React Native | ||
| */ | ||
| mode: 'strict' | 'compatibility', | ||
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| children: React.Node, | ||
| }>; | ||
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| // We want a graceful fallback for apps using legacy arch, but need to know | ||
| // ahead of time whether the component is available, so we test for global. | ||
| // This does not correctly handle mixed arch apps (which is okay, since we just | ||
| // degrade the error experience). | ||
| const isFabricUIManagerInstalled = global?.nativeFabricUIManager != null; | ||
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| /** | ||
| * Allows controlling the layout conformance/correctness behaviors of the subtree under this component. | ||
| */ | ||
| export default function LayoutConformance(props: Props): React.Node { | ||
| if (!isFabricUIManagerInstalled) { | ||
| return ( | ||
| <UnimplementedView> | ||
| <Text> | ||
| The LayoutConformance component is only supported in the New | ||
| Architecture | ||
| </Text> | ||
| </UnimplementedView> | ||
| ); | ||
| } | ||
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| return ( | ||
| <LayoutConformanceNativeComponent {...props} style={styles.container} /> | ||
| ); | ||
| } | ||
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| const styles = StyleSheet.create({ | ||
| container: { | ||
| display: 'contents', | ||
| }, | ||
| }); |
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...s/react-native/Libraries/Components/LayoutConformance/LayoutConformanceNativeComponent.js
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| /** | ||
| * Copyright (c) Meta Platforms, Inc. and affiliates. | ||
| * | ||
| * This source code is licensed under the MIT license found in the | ||
| * LICENSE file in the root directory of this source tree. | ||
| * | ||
| * @flow strict-local | ||
| * @format | ||
| */ | ||
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| import type {HostComponent} from '../../Renderer/shims/ReactNativeTypes'; | ||
| import type {ViewProps} from '../View/ViewPropTypes'; | ||
| import typeof LayoutConformance from './LayoutConformance'; | ||
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| import * as NativeComponentRegistry from '../../NativeComponent/NativeComponentRegistry'; | ||
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| type Props = $ReadOnly<{ | ||
| ...React.ElementConfig<LayoutConformance>, | ||
| ...ViewProps, | ||
| }>; | ||
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| const LayoutConformanceNativeComponent: HostComponent<Props> = | ||
| NativeComponentRegistry.get<Props>('LayoutConformance', () => ({ | ||
| uiViewClassName: 'LayoutConformance', | ||
| validAttributes: { | ||
| mode: true, | ||
| }, | ||
| })); | ||
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| export default LayoutConformanceNativeComponent; |
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...-native/ReactCommon/react/renderer/components/view/LayoutConformanceComponentDescriptor.h
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|---|---|---|
| @@ -0,0 +1,18 @@ | ||
| /* | ||
| * Copyright (c) Meta Platforms, Inc. and affiliates. | ||
| * | ||
| * This source code is licensed under the MIT license found in the | ||
| * LICENSE file in the root directory of this source tree. | ||
| */ | ||
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| #pragma once | ||
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| #include <react/renderer/components/view/LayoutConformanceShadowNode.h> | ||
| #include <react/renderer/core/ConcreteComponentDescriptor.h> | ||
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| namespace facebook::react { | ||
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| using LayoutConformanceComponentDescriptor = | ||
| ConcreteComponentDescriptor<LayoutConformanceShadowNode>; | ||
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| } // namespace facebook::react |
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packages/react-native/ReactCommon/react/renderer/components/view/LayoutConformanceProps.h
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| /* | ||
| * Copyright (c) Meta Platforms, Inc. and affiliates. | ||
| * | ||
| * This source code is licensed under the MIT license found in the | ||
| * LICENSE file in the root directory of this source tree. | ||
| */ | ||
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| #pragma once | ||
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| #include <react/renderer/components/view/YogaStylableProps.h> | ||
| #include <react/renderer/components/view/propsConversions.h> | ||
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| namespace facebook::react { | ||
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| struct LayoutConformanceProps final : public YogaStylableProps { | ||
| /** | ||
| * Whether to layout the subtree with strict conformance to W3C standard | ||
| * (YGErrataNone) or for compatibility with legacy RN bugs (YGErrataAll) | ||
| */ | ||
| LayoutConformance mode{LayoutConformance::Strict}; | ||
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| LayoutConformanceProps() = default; | ||
| LayoutConformanceProps( | ||
| const PropsParserContext& context, | ||
| const LayoutConformanceProps& sourceProps, | ||
| const RawProps& rawProps) | ||
| : YogaStylableProps(context, sourceProps, rawProps), | ||
| mode{convertRawProp( | ||
| context, | ||
| rawProps, | ||
| "mode", | ||
| mode, | ||
| LayoutConformance::Strict)} {} | ||
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| void setProp( | ||
| const PropsParserContext& context, | ||
| RawPropsPropNameHash hash, | ||
| const char* propName, | ||
| const RawValue& value) { | ||
| // We don't support iterator style props parser | ||
| } | ||
| }; | ||
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| } // namespace facebook::react |
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...ges/react-native/ReactCommon/react/renderer/components/view/LayoutConformanceShadowNode.h
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,24 @@ | ||
| /* | ||
| * Copyright (c) Meta Platforms, Inc. and affiliates. | ||
| * | ||
| * This source code is licensed under the MIT license found in the | ||
| * LICENSE file in the root directory of this source tree. | ||
| */ | ||
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| #pragma once | ||
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| #include <react/renderer/components/view/ConcreteViewShadowNode.h> | ||
| #include <react/renderer/components/view/LayoutConformanceProps.h> | ||
| #include <react/renderer/components/view/YogaLayoutableShadowNode.h> | ||
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| namespace facebook::react { | ||
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| constexpr const char LayoutConformanceShadowNodeComponentName[] = | ||
| "LayoutConformance"; | ||
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| using LayoutConformanceShadowNode = ConcreteShadowNode< | ||
| LayoutConformanceShadowNodeComponentName, | ||
| YogaLayoutableShadowNode, | ||
| LayoutConformanceProps>; | ||
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| } // namespace facebook::react |
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