bc518174
 王天杨
提交两个项目文件
|
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
|
import * as React from 'react';
import { styleSingleton } from 'react-style-singleton';
import { fullWidthClassName, zeroRightClassName, noScrollbarsClassName, removedBarSizeVariable } from './constants';
import { getGapWidth } from './utils';
const Style = styleSingleton();
export const lockAttribute = 'data-scroll-locked';
// important tip - once we measure scrollBar width and remove them
// we could not repeat this operation
// thus we are using style-singleton - only the first "yet correct" style will be applied.
const getStyles = ({ left, top, right, gap }, allowRelative, gapMode = 'margin', important) => `
.${noScrollbarsClassName} {
overflow: hidden ${important};
padding-right: ${gap}px ${important};
}
body[${lockAttribute}] {
overflow: hidden ${important};
overscroll-behavior: contain;
${[
allowRelative && `position: relative ${important};`,
gapMode === 'margin' &&
`
padding-left: ${left}px;
padding-top: ${top}px;
padding-right: ${right}px;
margin-left:0;
margin-top:0;
margin-right: ${gap}px ${important};
`,
gapMode === 'padding' && `padding-right: ${gap}px ${important};`,
]
.filter(Boolean)
.join('')}
}
.${zeroRightClassName} {
right: ${gap}px ${important};
}
.${fullWidthClassName} {
margin-right: ${gap}px ${important};
}
.${zeroRightClassName} .${zeroRightClassName} {
right: 0 ${important};
}
.${fullWidthClassName} .${fullWidthClassName} {
margin-right: 0 ${important};
}
body[${lockAttribute}] {
${removedBarSizeVariable}: ${gap}px;
}
`;
const getCurrentUseCounter = () => {
const counter = parseInt(document.body.getAttribute(lockAttribute) || '0', 10);
return isFinite(counter) ? counter : 0;
};
export const useLockAttribute = () => {
React.useEffect(() => {
document.body.setAttribute(lockAttribute, (getCurrentUseCounter() + 1).toString());
return () => {
const newCounter = getCurrentUseCounter() - 1;
if (newCounter <= 0) {
document.body.removeAttribute(lockAttribute);
}
else {
document.body.setAttribute(lockAttribute, newCounter.toString());
}
};
}, []);
};
/**
* Removes page scrollbar and blocks page scroll when mounted
*/
export const RemoveScrollBar = ({ noRelative, noImportant, gapMode = 'margin' }) => {
useLockAttribute();
/*
gap will be measured on every component mount
however it will be used only by the "first" invocation
due to singleton nature of <Style
*/
const gap = React.useMemo(() => getGapWidth(gapMode), [gapMode]);
return React.createElement(Style, { styles: getStyles(gap, !noRelative, gapMode, !noImportant ? '!important' : '') });
};
|
