react-native/RNTester/js/DimensionsExample.js

60 lines
1.3 KiB
JavaScript

/**
* Copyright (c) 2015-present, Facebook, Inc.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*
* @providesModule DimensionsExample
* @flow
*/
'use strict';
const React = require('react');
const ReactNative = require('react-native');
const {
Dimensions,
Text,
View
} = ReactNative;
class DimensionsSubscription extends React.Component<{dim: string}, {dims: Object}> {
state = {
dims: Dimensions.get(this.props.dim),
};
componentDidMount() {
Dimensions.addEventListener('change', this._handleDimensionsChange);
}
componentWillUnmount() {
Dimensions.removeEventListener('change', this._handleDimensionsChange);
}
_handleDimensionsChange = (dimensions) => {
this.setState({
dims: dimensions[this.props.dim],
});
};
render() {
return (
<View>
<Text>{JSON.stringify(this.state.dims)}</Text>
</View>
);
}
}
exports.title = 'Dimensions';
exports.description = 'Dimensions of the viewport';
exports.examples = [
{
title: 'window',
render(): React.Element<any> { return <DimensionsSubscription dim="window" />; }
},
{
title: 'screen',
render(): React.Element<any> { return <DimensionsSubscription dim="screen" />; }
},
];