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/* @flow */
import { extend } from 'shared/util'
function updateClass (oldVnode: VNodeWithData, vnode: VNodeWithData) {
const el = vnode.elm
const ctx = vnode.context
const data: VNodeData = vnode.data
const oldData: VNodeData = oldVnode.data
if (!data.staticClass &&
!data.class &&
(!oldData || (!oldData.staticClass && !oldData.class))
) {
return
}
const oldClassList = []
// unlike web, weex vnode staticClass is an Array
const oldStaticClass: any = oldData.staticClass
if (oldStaticClass) {
oldClassList.push.apply(oldClassList, oldStaticClass)
}
if (oldData.class) {
oldClassList.push.apply(oldClassList, oldData.class)
}
const classList = []
// unlike web, weex vnode staticClass is an Array
const staticClass: any = data.staticClass
if (staticClass) {
classList.push.apply(classList, staticClass)
}
if (data.class) {
classList.push.apply(classList, data.class)
}
if (typeof el.setClassList === 'function') {
el.setClassList(classList)
} else {
const style = getStyle(oldClassList, classList, ctx)
if (typeof el.setStyles === 'function') {
el.setStyles(style)
} else {
for (const key in style) {
el.setStyle(key, style[key])
}
}
}
}
function getStyle (oldClassList: Array<string>, classList: Array<string>, ctx: Component): Object {
// style is a weex-only injected object
// compiled from <style> tags in weex files
const stylesheet: any = ctx.$options.style || {}
const result = {}
classList.forEach(name => {
const style = stylesheet[name]
extend(result, style)
})
oldClassList.forEach(name => {
const style = stylesheet[name]
for (const key in style) {
if (!result.hasOwnProperty(key)) {
result[key] = ''
}
}
})
return result
}
export default {
create: updateClass,
update: updateClass
}
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