73 lines
1.6 KiB
JavaScript
73 lines
1.6 KiB
JavaScript
// @flow
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import React, { PureComponent } from 'react';
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import { View } from 'react-native';
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import styles from './styles';
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/**
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* AspectRatioDetector component's property types.
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*/
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type Props = {
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/**
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* The "onLayout" handler.
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*/
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onDimensionsChanged: Function,
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/**
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* Any nested components.
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*/
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children: React$Node
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};
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/**
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* A {@link View} which captures the 'onLayout' event and calls a prop with the
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* component size.
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*/
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export default class DimensionsDetector extends PureComponent<Props> {
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/**
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* Initializes a new DimensionsDetector instance.
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*
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* @param {Object} props - The read-only properties with which the new
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* instance is to be initialized.
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*/
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constructor(props: Object) {
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super(props);
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this._onLayout = this._onLayout.bind(this);
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}
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_onLayout: (Object) => void;
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/**
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* Handles the "on layout" View's event and calls the onDimensionsChanged
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* prop.
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*
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* @param {Object} event - The "on layout" event object/structure passed
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* by react-native.
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* @private
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* @returns {void}
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*/
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_onLayout({ nativeEvent: { layout: { height, width } } }) {
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const { onDimensionsChanged } = this.props;
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onDimensionsChanged && onDimensionsChanged(width, height);
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}
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/**
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* Renders the root view and it's children.
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*
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* @returns {Component}
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*/
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render() {
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return (
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<View
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onLayout = { this._onLayout }
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style = { styles.dimensionsDetector } >
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{ this.props.children }
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</View>
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);
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}
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}
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