4cd4fd28
 郭伟龙
feat: 初始化项目
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import type { Component } from 'types/component'
import {
tip,
toArray,
isArray,
hyphenate,
formatComponentName,
invokeWithErrorHandling
} from '../util/index'
import { updateListeners } from '../vdom/helpers/index'
export function initEvents(vm: Component) {
vm._events = Object.create(null)
vm._hasHookEvent = false
// init parent attached events
const listeners = vm.$options._parentListeners
if (listeners) {
updateComponentListeners(vm, listeners)
}
}
let target: any
function add(event, fn) {
target.$on(event, fn)
}
function remove(event, fn) {
target.$off(event, fn)
}
function createOnceHandler(event, fn) {
const _target = target
return function onceHandler() {
const res = fn.apply(null, arguments)
if (res !== null) {
_target.$off(event, onceHandler)
}
}
}
export function updateComponentListeners(
vm: Component,
listeners: Object,
oldListeners?: Object | null
) {
target = vm
updateListeners(
listeners,
oldListeners || {},
add,
remove,
createOnceHandler,
vm
)
target = undefined
}
export function eventsMixin(Vue: typeof Component) {
const hookRE = /^hook:/
Vue.prototype.$on = function (
event: string | Array<string>,
fn: Function
): Component {
const vm: Component = this
if (isArray(event)) {
for (let i = 0, l = event.length; i < l; i++) {
vm.$on(event[i], fn)
}
} else {
;(vm._events[event] || (vm._events[event] = [])).push(fn)
// optimize hook:event cost by using a boolean flag marked at registration
// instead of a hash lookup
if (hookRE.test(event)) {
vm._hasHookEvent = true
}
}
return vm
}
Vue.prototype.$once = function (event: string, fn: Function): Component {
const vm: Component = this
function on() {
vm.$off(event, on)
fn.apply(vm, arguments)
}
on.fn = fn
vm.$on(event, on)
return vm
}
Vue.prototype.$off = function (
event?: string | Array<string>,
fn?: Function
): Component {
const vm: Component = this
// all
if (!arguments.length) {
vm._events = Object.create(null)
return vm
}
// array of events
if (isArray(event)) {
for (let i = 0, l = event.length; i < l; i++) {
vm.$off(event[i], fn)
}
return vm
}
// specific event
const cbs = vm._events[event!]
if (!cbs) {
return vm
}
if (!fn) {
vm._events[event!] = null
return vm
}
// specific handler
let cb
let i = cbs.length
while (i--) {
cb = cbs[i]
if (cb === fn || cb.fn === fn) {
cbs.splice(i, 1)
break
}
}
return vm
}
Vue.prototype.$emit = function (event: string): Component {
const vm: Component = this
if (__DEV__) {
const lowerCaseEvent = event.toLowerCase()
if (lowerCaseEvent !== event && vm._events[lowerCaseEvent]) {
tip(
`Event "${lowerCaseEvent}" is emitted in component ` +
`${formatComponentName(
vm
)} but the handler is registered for "${event}". ` +
`Note that HTML attributes are case-insensitive and you cannot use ` +
`v-on to listen to camelCase events when using in-DOM templates. ` +
`You should probably use "${hyphenate(
event
)}" instead of "${event}".`
)
}
}
let cbs = vm._events[event]
if (cbs) {
cbs = cbs.length > 1 ? toArray(cbs) : cbs
const args = toArray(arguments, 1)
const info = `event handler for "${event}"`
for (let i = 0, l = cbs.length; i < l; i++) {
invokeWithErrorHandling(cbs[i], vm, args, vm, info)
}
}
return vm
}
}
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