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CPLAT-9347 Add memo for function components #613
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rmconsole6-wk
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function-components-wip
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cplat-9347-add-memo-hoc
Jul 30, 2020
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,94 @@ | ||
| // Copyright 2020 Workiva Inc. | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
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| library over_react.memo; | ||
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| import 'package:over_react/src/component_declaration/component_type_checking.dart'; | ||
| import 'package:react/react_client/react_interop.dart' as react_interop; | ||
| import 'package:react/react_client.dart'; | ||
| import 'package:over_react/component_base.dart'; | ||
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| /// A [higher order component](https://reactjs.org/docs/higher-order-components.html) for function components | ||
| /// that behaves similar to the way [`React.PureComponent`](https://reactjs.org/docs/react-api.html#reactpurecomponent) | ||
| /// does for class-based components. | ||
| /// | ||
| /// If your function component renders the same result given the same props, you can wrap it in a call to | ||
| /// `memo` for a performance boost in some cases by memoizing the result. This means that React will skip | ||
| /// rendering the component, and reuse the last rendered result. | ||
| /// | ||
| /// > __NOTE:__ This should only be used to wrap function components. | ||
| /// | ||
| /// ```dart | ||
| /// import 'package:over_react/over_react.dart' as react; | ||
| /// | ||
| /// UiFactory<UiProps> MemoExample = memo<UiProps>(uiFunction( | ||
| /// (props) { | ||
| /// // render using props | ||
| /// }, | ||
| /// FunctionComponentConfig(), | ||
| /// )); | ||
| /// ``` | ||
| /// | ||
| /// `memo` only affects props changes. If your function component wrapped in `memo` has a | ||
| /// `useState` or `useContext` Hook in its implementation, it will still rerender when `state` or `context` change. | ||
| /// | ||
| /// By default it will only shallowly compare complex objects in the props map. | ||
| /// If you want control over the comparison, you can also provide a custom comparison | ||
| /// function to the [areEqual] argument as shown in the example below. | ||
| /// | ||
| /// ```dart | ||
| /// import 'package:over_react/over_react.dart' as react; | ||
| /// | ||
| /// UiFactory<MemoWithComparisonProps> MemoWithComparison = memo<MemoWithComparisonProps>(uiFunction( | ||
| /// (props) { | ||
| /// // render using props | ||
| /// }, | ||
| /// $MemoWithComparisonConfig, // ignore: undefined_identifier | ||
| /// ), areEqual: (prevProps, nextProps) { | ||
| /// // Do some custom comparison logic to return a bool based on prevProps / nextProps | ||
| /// }); | ||
| /// ``` | ||
| /// | ||
| /// > __This method only exists as a performance optimization.__ | ||
| /// > | ||
| /// > Do not rely on it to “prevent” a render, as this can lead to bugs. | ||
| /// | ||
| /// See: <https://reactjs.org/docs/react-api.html#reactmemo>. | ||
| UiFactory<TProps> memo<TProps extends UiProps>(UiFactory<TProps> factory, | ||
| {bool Function(TProps prevProps, TProps nextProps) areEqual, | ||
| String displayName}) { | ||
| enforceFunctionComponent(factory().componentFactory); | ||
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| ReactComponentFactoryProxy hoc; | ||
| if (areEqual != null) { | ||
| bool wrapProps(Map prevProps, Map nextProps) { | ||
| final tPrevProps = factory(prevProps); | ||
| final tNextProps = factory(nextProps); | ||
| return areEqual(tPrevProps, tNextProps); | ||
| } | ||
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| hoc = react_interop.memo(factory().componentFactory, areEqual: wrapProps); | ||
| } else { | ||
| hoc = react_interop.memo(factory().componentFactory); | ||
| } | ||
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| setComponentTypeMeta(hoc, | ||
| isHoc: true, parentType: factory().componentFactory); | ||
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| TProps forwardedFactory([Map props]) { | ||
| return factory(props)..componentFactory = hoc; | ||
| } | ||
|
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| return forwardedFactory; | ||
| } |
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This is the only code change. The other changes are from
ddev format