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|
import * as React from 'react';
import styled from 'styled-components';
import { colors } from 'ts/variables';
import { Button as BaseButton } from './Button';
const isTouch = Boolean(
'ontouchstart' in window ||
(window as any).navigator.maxTouchPoints > 0 ||
(window as any).navigator.msMaxTouchPoints > 0,
);
interface CodeProps {
language?: string;
isLight?: boolean;
isDiff?: boolean;
gutter?: Array<number | undefined>;
gutterLength?: number;
canCopy?: boolean;
isEtc?: boolean;
}
interface CodeState {
hlCode?: string;
didCopy?: boolean;
}
const Button = styled(BaseButton)`
opacity: ${isTouch ? '1' : '0'};
position: absolute;
top: 1rem;
right: 1rem;
transition: opacity 0.2s;
:focus {
opacity: 1;
}
`;
const Container = styled.div`
position: relative;
&:hover ${Button} {
opacity: 1;
}
`;
const Base =
styled.div <
CodeProps >
`
font-size: .875rem;
color: ${props => (props.language === undefined ? colors.white : 'inherit')};
background-color: ${props =>
props.isLight ? 'rgba(255,255,255,.15)' : props.language === undefined ? colors.black : '#F1F4F5'};
white-space: ${props => (props.language === undefined ? 'nowrap' : '')};
position: relative;
${props =>
props.isDiff
? `
background-color: #E9ECED;
display: flex;
padding-top: 1.5rem;
padding-bottom: 1.5rem;
overflow-x: auto;
-webkit-overflow-scrolling: touch;
`
: ``}
`;
const StyledCodeDiff = styled(({ gutterLength, children, ...props }: any) => <code {...props}>{children}</code>)`
::before {
content: '';
width: calc(0.75rem + ${props => props.gutterLength}ch);
background-color: #e2e5e6;
position: absolute;
top: 0;
left: 0;
bottom: 0;
}
[class^='line-'] {
display: inline-block;
width: 100%;
position: relative;
padding-right: 1.5rem;
padding-left: calc(2.25rem + ${props => props.gutterLength}ch);
::before {
content: attr(data-gutter);
width: ${props => props.gutterLength};
padding-left: 0.375rem;
padding-right: 0.375rem;
position: absolute;
top: 50%;
left: 0;
transform: translateY(-50%);
z-index: 1;
}
}
.line-addition {
background-color: rgba(0, 202, 105, 0.1);
}
.line-deletion {
background-color: rgba(255, 0, 0, 0.07);
}
`;
const StyledPre = styled.pre`
margin: 0;
${(props: { isDiff: boolean }) =>
!props.isDiff
? `
padding: 1.5rem;
overflow-x: auto;
-webkit-overflow-scrolling: touch;
`
: ``};
`;
const StyledCopyInput = styled.textarea`
opacity: 0;
height: 0;
position: absolute;
top: 0;
right: 0;
z-index: -1;
`;
const CopyInput = StyledCopyInput as any;
class Code extends React.Component<CodeProps, CodeState> {
public state: CodeState = {};
private readonly _code = React.createRef<HTMLTextAreaElement>();
public componentDidMount(): void {
/*
* _onMountAsync is only setting state, so no point in handling the promise
*/
// tslint:disable-next-line:no-floating-promises
this._onMountAsync();
}
public render(): React.ReactNode {
const { language, isLight, isDiff, children, gutterLength, canCopy } = this.props;
const { hlCode } = this.state;
let CodeComponent = 'code';
let codeProps = {};
if (isDiff) {
codeProps = { gutterLength };
CodeComponent = StyledCodeDiff as any;
}
return (
<Container>
<Base language={language} isDiff={isDiff} isLight={isLight}>
<StyledPre isDiff={isDiff}>
<CodeComponent
{...codeProps}
dangerouslySetInnerHTML={hlCode ? { __html: this.state.hlCode } : null}
>
{hlCode === undefined ? children : null}
</CodeComponent>
</StyledPre>
{!('clipboard' in navigator) ? (
<CopyInput readOnly={true} aria-hidden="true" ref={this._code} value={children} />
) : null}
</Base>
{navigator.userAgent !== 'ReactSnap' && canCopy ? (
<Button onClick={this._handleCopyAsync}>{this.state.didCopy ? 'Copied' : 'Copy'}</Button>
) : null}
</Container>
);
}
private async _onMountAsync(): Promise<void> {
const { language, children, isDiff, gutter, isEtc } = this.props;
const code = children as string;
if (language !== undefined) {
const { highlight } = await System.import(/* webpackChunkName: 'highlightjs' */ 'ts/highlight');
this.setState({
hlCode: highlight({ language, code, isDiff, gutter, isEtc }),
});
}
}
private readonly _handleCopyAsync = async () => {
try {
if ('clipboard' in navigator) {
await (navigator as any).clipboard.writeText(this.props.children);
this.setState({ didCopy: true });
} else {
const lastActive = document.activeElement as HTMLElement;
this._code.current.focus();
this._code.current.select();
document.execCommand('copy');
lastActive.focus();
this.setState({ didCopy: true });
}
} catch (error) {
this.setState({ didCopy: false });
}
};
}
export { Code };
|
