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/* @flow */
import { isDef, isUndef } from 'shared/util'
import { updateListeners } from 'core/vdom/helpers/index'
import { withMacroTask, isIE, supportsPassive } from 'core/util/index'
import { RANGE_TOKEN, CHECKBOX_RADIO_TOKEN } from 'web/compiler/directives/model'
// normalize v-model event tokens that can only be determined at runtime.
// it's important to place the event as the first in the array because
// the whole point is ensuring the v-model callback gets called before
// user-attached handlers.
function normalizeEvents (on) {
/* istanbul ignore if */
if (isDef(on[RANGE_TOKEN])) {
// IE input[type=range] only supports `change` event
const event = isIE ? 'change' : 'input'
on[event] = [].concat(on[RANGE_TOKEN], on[event] || [])
delete on[RANGE_TOKEN]
}
// This was originally intended to fix #4521 but no longer necessary
// after 2.5. Keeping it for backwards compat with generated code from < 2.4
/* istanbul ignore if */
if (isDef(on[CHECKBOX_RADIO_TOKEN])) {
on.change = [].concat(on[CHECKBOX_RADIO_TOKEN], on.change || [])
delete on[CHECKBOX_RADIO_TOKEN]
}
}
let target: any
function createOnceHandler (handler, event, 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,
once: boolean,
capture: boolean,
passive: boolean
) {
handler = withMacroTask(handler)
if (once) handler = createOnceHandler(handler, event, capture)
target.addEventListener(
event,
handler,
supportsPassive
? { capture, passive }
: capture
)
}
function remove (
event: string,
handler: Function,
capture: boolean,
_target?: HTMLElement
) {
(_target || target).removeEventListener(
event,
handler._withTask || handler,
capture
)
}
function updateDOMListeners (oldVnode: VNodeWithData, vnode: VNodeWithData) {
if (isUndef(oldVnode.data.on) && isUndef(vnode.data.on)) {
return
}
const on = vnode.data.on || {}
const oldOn = oldVnode.data.on || {}
target = vnode.elm
normalizeEvents(on)
updateListeners(on, oldOn, add, remove, vnode.context)
target = undefined
}
export default {
create: updateDOMListeners,
update: updateDOMListeners
}
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