aboutsummaryrefslogtreecommitdiffstats
path: root/packages/dev-tools-pages/ts/components/Code.tsx
blob: 63c9d369b8bf29709f49a3c9dbaa9a24008fab68 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
import * as React from 'react';
import styled from 'styled-components';

import { colors } from '../variables';
import BaseButton from './Button';

interface CodeProps {
    children: React.ReactNode;
    language?: string;
}

interface CodeState {
    hlCode?: string;
    copied?: boolean;
}

const Button = styled(BaseButton)`
    opacity: 0;
    position: absolute;
    top: 1rem;
    right: 1rem;
    transition: opacity 0.2s;
`;

const Base =
    styled.div <
    CodeProps >
    `
    color: ${props => (props.language === undefined ? colors.white : 'inherit')};
    background-color: ${props => (props.language === undefined ? colors.black : colors.lightGray)};
    white-space: ${props => (props.language === undefined ? 'nowrap' : '')};
    position: relative;
    &:hover ${Button} {
        opacity: 1;
    }
`;

const StyledCode = styled.code`
    padding: 1.5rem;
    display: block;
    overflow-y: scroll;
    -webkit-overflow-scrolling: touch;
`;

const StyledPre = styled.pre`
    margin: 0;
`;

const StyledCopyInput = styled.textarea`
    height: 0;
    position: absolute;
    top: 0;
    right: 0;
    z-index: -1;
`;

const CopyInput = StyledCopyInput as any;

class Code extends React.Component<CodeProps, CodeState> {
    code = React.createRef<HTMLTextAreaElement>();

    state: CodeState = {};

    constructor(props: CodeProps) {
        super(props);
    }

    async componentDidMount() {
        const { language, children } = this.props;

        if (language !== undefined) {
            const { default: hljs } = await System.import(/* webpackChunkName: 'highlightjs' */ 'ts/highlight');
            const { value: hlCode } = hljs.highlight(language, children as string);
            this.setState({ hlCode });
        }
    }

    handleCopy = async () => {
        try {
            if ('clipboard' in navigator) {
                await (navigator as any).clipboard.writeText(this.props.children);
                this.setState({ copied: true });
            } else {
                this.code.current.focus();
                this.code.current.select();
                document.execCommand('copy');
                this.setState({ copied: true });
            }
        } catch (error) {
            this.setState({ copied: false });
        }
    };

    render() {
        const { language, children } = this.props;

        return (
            <Base language={language}>
                <StyledPre>
                    {this.state.hlCode !== undefined ? (
                        <StyledCode dangerouslySetInnerHTML={{ __html: this.state.hlCode }} />
                    ) : (
                        <StyledCode>{this.props.children}</StyledCode>
                    )}
                </StyledPre>
                {navigator.userAgent !== 'ReactSnap' ? <Button onClick={this.handleCopy}>Copy</Button> : null}
                {!('clipboard' in navigator) ? (
                    <CopyInput readOnly aria-hidden="true" ref={this.code} value={children} />
                ) : null}
            </Base>
        );
    }
}

export default Code;