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/* @flow */
import { updateListeners } from 'core/vdom/helpers/update-listeners'
let target: any
function createOnceHandler (event, handler, capture) {
const _target = target // save current target element in closure
return function onceHandler () {
const res = handler.apply(null, arguments)
if (res !== null) {
remove(event, onceHandler, capture, _target)
}
}
}
function add (
event: string,
handler: Function,
capture: boolean,
passive?: boolean,
params?: Array<any>
) {
if (capture) {
console.log('Weex do not support event in bubble phase.')
return
}
target.addEvent(event, handler, params)
}
function remove (
event: string,
handler: any,
capture: any,
_target?: any
) {
(_target || target).removeEvent(event)
}
function updateDOMListeners (oldVnode: VNodeWithData, vnode: VNodeWithData) {
if (!oldVnode.data.on && !vnode.data.on) {
return
}
const on = vnode.data.on || {}
const oldOn = oldVnode.data.on || {}
target = vnode.elm
updateListeners(on, oldOn, add, remove, createOnceHandler, vnode.context)
target = undefined
}
export default {
create: updateDOMListeners,
update: updateDOMListeners
}