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https://github.com/facebook/react-native.git
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Spencer Ahrens
5ec382d1be
Summary:
Automatically provides and subscribes to dimension updates - super easy usage:
```
function MyComponent(props: Props) {
const {width, height, scale, fontScale} = useWindowDimensions();
return <Text ...
};
```
Only window for now - it's what people want 99% of the time, so we'll just shovel out a pit of success for them...
There are still cases where `Dimensions` is needed outside of React component render functions, like in GraphQL variables, so we need to keep the existing module.
Reviewed By: zackargyle
Differential Revision: D16525189
fbshipit-source-id: 0a049fb3be8d92888a8a69e3898d337b93422a09
69 lines
1.5 KiB
JavaScript
69 lines
1.5 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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'use strict';
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import * as React from 'react';
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import {Dimensions, Text, useWindowDimensions} from 'react-native';
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class DimensionsSubscription extends React.Component<
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{dim: string},
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{dims: Object},
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> {
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state = {
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dims: Dimensions.get(this.props.dim),
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};
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componentDidMount() {
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Dimensions.addEventListener('change', this._handleDimensionsChange);
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}
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componentWillUnmount() {
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Dimensions.removeEventListener('change', this._handleDimensionsChange);
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}
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_handleDimensionsChange = dimensions => {
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this.setState({
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dims: dimensions[this.props.dim],
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});
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};
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render() {
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return <Text>{JSON.stringify(this.state.dims, null, 2)}</Text>;
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}
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}
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exports.title = 'Dimensions';
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exports.description = 'Dimensions of the viewport';
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exports.examples = [
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{
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title: 'useWindowDimensions hook',
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render() {
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const DimensionsViaHook = () => {
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const dims = useWindowDimensions();
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return <Text>{JSON.stringify(dims, null, 2)}</Text>;
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};
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return <DimensionsViaHook />;
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},
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},
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{
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title: 'Non-component `get` API: window',
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render(): React.Element<any> {
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return <DimensionsSubscription dim="window" />;
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},
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},
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{
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title: 'Non-component `get` API: screen',
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render(): React.Element<any> {
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return <DimensionsSubscription dim="screen" />;
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},
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},
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];
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