726966fdc0
Summary: My benchmarks have shown react-emotion to be faster than the current implementation of `styled`. For this reason, I am converting all styling to [emotion](https://emotion.sh). Benchmark results: {F136839093} The syntax is very similar between the two libraries. The main difference is that emotion only allows a single function for the whole style attribute, whereas the old implementation had functions for every style-attirbute. Before: ``` { color: props => props.color, fontSize: props => props.size, } ``` After: ``` props => ({ color: props.color, fontSize: props.size, }) ``` Reviewed By: jknoxville Differential Revision: D9479893 fbshipit-source-id: 2c39e4618f7e52ceacb67bbec8ae26114025723f
69 lines
1.4 KiB
JavaScript
69 lines
1.4 KiB
JavaScript
/**
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* Copyright 2018-present Facebook.
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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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* @format
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*/
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import {Component} from 'react';
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import Box from './Box.js';
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import {colors} from './colors';
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import styled from '../styled/index.js';
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const FocusableBoxBorder = styled(Box)({
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border: `1px solid ${colors.highlight}`,
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bottom: '0',
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left: '0',
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pointerEvents: 'none',
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position: 'absolute',
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right: '0',
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top: '0',
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});
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export default class FocusableBox extends Component<
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Object,
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{|
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focused: boolean,
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|},
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> {
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constructor(props: Object, context: Object) {
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super(props, context);
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this.state = {focused: false};
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}
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static defaultProps = {
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focusable: true,
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};
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onBlur = (e: SyntheticFocusEvent<>) => {
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const {onBlur} = this.props;
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if (onBlur) {
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onBlur(e);
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}
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if (this.state.focused) {
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this.setState({focused: false});
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}
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};
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onFocus = (e: SyntheticFocusEvent<>) => {
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const {onFocus} = this.props;
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if (onFocus) {
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onFocus(e);
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}
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if (this.props.focusable) {
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this.setState({focused: true});
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}
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};
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render() {
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const {props} = this;
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return (
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<Box {...props} onFocus={this.onFocus} onBlur={this.onBlur} tabIndex="0">
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{props.children}
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{this.state.focused && <FocusableBoxBorder />}
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</Box>
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);
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}
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}
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