events.js
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/* @flow */
import { updateListeners } from 'core/vdom/helpers/index'
let target: HTMLElement
function add (
event: string,
handler: Function,
once: boolean,
capture: boolean
) {
if (once) {
const oldHandler = handler
const _target = target // save current target element in closure
handler = function (ev) {
remove(event, handler, capture, _target)
arguments.length === 1
? oldHandler(ev)
: oldHandler.apply(null, arguments)
}
}
target.addEventListener(event, handler, capture)
}
function remove (
event: string,
handler: Function,
capture: boolean,
_target?: HTMLElement
) {
(_target || target).removeEventListener(event, handler, capture)
}
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, vnode.context)
}
export default {
create: updateDOMListeners,
update: updateDOMListeners
}