/* @flow */
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import {
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isDef,
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isUndef
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} from 'shared/util'
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import {
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concat,
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stringifyClass,
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genClassForVnode
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} from 'web/util/index'
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function updateClass (oldVnode: any, vnode: any) {
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const el = vnode.elm
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const data: VNodeData = vnode.data
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const oldData: VNodeData = oldVnode.data
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if (
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isUndef(data.staticClass) &&
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isUndef(data.class) && (
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isUndef(oldData) || (
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isUndef(oldData.staticClass) &&
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isUndef(oldData.class)
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)
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)
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) {
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return
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}
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let cls = genClassForVnode(vnode)
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// handle transition classes
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const transitionClass = el._transitionClasses
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if (isDef(transitionClass)) {
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cls = concat(cls, stringifyClass(transitionClass))
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}
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// set the class
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if (cls !== el._prevClass) {
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el.setAttribute('class', cls)
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el._prevClass = cls
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}
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}
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export default {
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create: updateClass,
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update: updateClass
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}
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