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/* @flow */
import { getStyle, normalizeStyleBinding } from 'web/util/style'
import { cached, camelize, extend, isDef, isUndef } from 'shared/util'
const cssVarRE = /^--/
const importantRE = /\s*!important$/
const setProp = (el, name, val) => {
/* istanbul ignore if */
if (cssVarRE.test(name)) {
el.style.setProperty(name, val)
} else if (importantRE.test(val)) {
el.style.setProperty(name, val.replace(importantRE, ''), 'important')
} else {
const normalizedName = normalize(name)
if (Array.isArray(val)) {
// Support values array created by autoprefixer, e.g.
// {display: ["-webkit-box", "-ms-flexbox", "flex"]}
// Set them one by one, and the browser will only set those it can recognize
for (let i = 0, len = val.length; i < len; i++) {
el.style[normalizedName] = val[i]
}
} else {
el.style[normalizedName] = val
}
}
}
const vendorNames = ['Webkit', 'Moz', 'ms']
let emptyStyle
const normalize = cached(function (prop) {
emptyStyle = emptyStyle || document.createElement('div').style
prop = camelize(prop)
if (prop !== 'filter' && (prop in emptyStyle)) {
return prop
}
const capName = prop.charAt(0).toUpperCase() + prop.slice(1)
for (let i = 0; i < vendorNames.length; i++) {
const name = vendorNames[i] + capName
if (name in emptyStyle) {
return name
}
}
})
function updateStyle (oldVnode: VNodeWithData, vnode: VNodeWithData) {
const data = vnode.data
const oldData = oldVnode.data
if (isUndef(data.staticStyle) && isUndef(data.style) &&
isUndef(oldData.staticStyle) && isUndef(oldData.style)
) {
return
}
let cur, name
const el: any = vnode.elm
const oldStaticStyle: any = oldData.staticStyle
const oldStyleBinding: any = oldData.normalizedStyle || oldData.style || {}
// if static style exists, stylebinding already merged into it when doing normalizeStyleData
const oldStyle = oldStaticStyle || oldStyleBinding
const style = normalizeStyleBinding(vnode.data.style) || {}
// store normalized style under a different key for next diff
// make sure to clone it if it's reactive, since the user likely wants
// to mutate it.
vnode.data.normalizedStyle = isDef(style.__ob__)
? extend({}, style)
: style
const newStyle = getStyle(vnode, true)
for (name in oldStyle) {
if (isUndef(newStyle[name])) {
setProp(el, name, '')
}
}
for (name in newStyle) {
cur = newStyle[name]
if (cur !== oldStyle[name]) {
// ie9 setting to null has no effect, must use empty string
setProp(el, name, cur == null ? '' : cur)
}
}
}
export default {
create: updateStyle,
update: updateStyle
}
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