forked from vuejs/core
-
Notifications
You must be signed in to change notification settings - Fork 0
/
style.ts
89 lines (83 loc) 路 2.36 KB
/
style.ts
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
import { isString, hyphenate, capitalize, isArray } from '@vue/shared'
import { camelize } from '@vue/runtime-core'
import { VShowElement } from '../directives/vShow'
type Style = string | Record<string, string | string[]> | null
export function patchStyle(el: Element, prev: Style, next: Style) {
const style = (el as HTMLElement).style
const currentDisplay = style.display
if (!next) {
el.removeAttribute('style')
} else if (isString(next)) {
if (prev !== next) {
style.cssText = next
}
} else {
for (const key in next) {
setStyle(style, key, next[key])
}
if (prev && !isString(prev)) {
for (const key in prev) {
if (next[key] == null) {
setStyle(style, key, '')
}
}
}
}
// indicates that the `display` of the element is controlled by `v-show`,
// so we always keep the current `display` value regardless of the `style` value,
// thus handing over control to `v-show`.
if ('_vod' in el && currentDisplay !== style.display) {
(el as VShowElement)._vod = style.display;
if (!(el as VShowElement)._vds) {
// if vshow was set to hide
style.display = currentDisplay;
}
}
}
const importantRE = /\s*!important$/
function setStyle(
style: CSSStyleDeclaration,
name: string,
val: string | string[]
) {
if (isArray(val)) {
val.forEach(v => setStyle(style, name, v))
} else {
if (name.startsWith('--')) {
// custom property definition
style.setProperty(name, val)
} else {
const prefixed = autoPrefix(style, name)
if (importantRE.test(val)) {
// !important
style.setProperty(
hyphenate(prefixed),
val.replace(importantRE, ''),
'important'
)
} else {
style[prefixed as any] = val
}
}
}
}
const prefixes = ['Webkit', 'Moz', 'ms']
const prefixCache: Record<string, string> = {}
function autoPrefix(style: CSSStyleDeclaration, rawName: string): string {
const cached = prefixCache[rawName]
if (cached) {
return cached
}
let name = camelize(rawName)
if (name !== 'filter' && name in style) {
return (prefixCache[rawName] = name)
}
name = capitalize(name)
for (let i = 0; i < prefixes.length; i++) {
const prefixed = prefixes[i] + name
if (prefixed in style) {
return (prefixCache[rawName] = prefixed)
}
}
return rawName
}