/
Toc.js
129 lines (105 loc) · 2.55 KB
/
Toc.js
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
116
117
118
119
120
121
122
123
124
125
126
127
128
129
import React from 'react';
import styled from 'astroturf';
export const TocContext = React.createContext();
const SidePanel = styled('div')`
@import '../css/theme';
$top: 4rem;
order: 2;
position: sticky;
top: $top;
height: calc(100vh - #{$top});
padding-top: 1.5rem;
padding-bottom: 1.5rem;
font-size: 0.875rem;
overflow-y: auto;
& > ul {
padding-left: 0;
border-left: 1px solid $divider;
& ul {
padding-left: 1rem;
}
}
`;
const ListItem = styled('li')`
@import '../css/theme';
& a {
display: block;
padding: 0.125rem 1.5rem;
color: transparentize($text, 0.4);
&:hover {
color: $primary;
text-decoration: none;
}
}
`;
const propTypes = {};
function toTree(list) {
let map = {};
let root = { children: [] };
let parents = [];
let last = null;
// eslint-disable-next-line
for (let item of list) {
if (last && item.level > last.level) parents.push(last);
if (last && item.level < last.level) parents.pop();
last = item;
let parent = parents[parents.length - 1];
map[item.id] = map[item.id] || [];
item.children = map[item.id];
if (parent) {
map[parent.id] = map[parent.id] || [];
map[parent.id].push(item);
} else root.children.push(item);
}
return root;
}
/* eslint-disable react/no-unused-state */
export class TocProvider extends React.Component {
constructor(...args) {
super(...args);
this.list = new Map();
this.state = {
tree: { children: [] },
registerNode: this.handleRegisterNode,
};
}
handleRegisterNode = (level, title, id) => {
if (level === 1) return;
this.list.set(id, { level, title, id });
cancelAnimationFrame(this.rafHandle);
this.rafHandle = requestAnimationFrame(() => {
this.setState({ tree: toTree(this.list.values()) });
});
};
render() {
return (
<TocContext.Provider value={this.state}>
{this.props.children}
</TocContext.Provider>
);
}
}
/* eslint-enable react/no-unused-state */
TocProvider.propTypes = propTypes;
function renderNode(root) {
return (
<>
{root.title && <a href={`#${root.id}`}>{root.title}</a>}
<ul className="list-unstyled">
{root.children.map((item, idx) => (
<ListItem key={idx} level={item.level}>
{renderNode(item)}
</ListItem>
))}
</ul>
</>
);
}
function Toc(props) {
return (
<SidePanel {...props}>
<TocContext.Consumer>{(c) => renderNode(c.tree)}</TocContext.Consumer>
</SidePanel>
);
}
export default Toc;