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lifecycle.js
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lifecycle.js
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/* @flow */
import Watcher from '../observer/watcher'
import { emptyVNode } from '../vdom/vnode'
import { observerState } from '../observer/index'
import { warn, validateProp, remove, noop } from '../util/index'
import { resolveSlots } from './render'
export let activeInstance: any = null
export function initLifecycle (vm: Component) {
const options = vm.$options
// locate first non-abstract parent
let parent = options.parent
if (parent && !options.abstract) {
while (parent.$options.abstract && parent.$parent) {
parent = parent.$parent
}
parent.$children.push(vm)
}
vm.$parent = parent
vm.$root = parent ? parent.$root : vm
vm.$children = []
vm.$refs = {}
vm._watcher = null
vm._inactive = false
vm._isMounted = false
vm._isDestroyed = false
vm._isBeingDestroyed = false
}
export function lifecycleMixin (Vue: Class<Component>) {
Vue.prototype._mount = function (
el?: Element | void,
hydrating?: boolean
): Component {
const vm: Component = this
vm.$el = el
if (!vm.$options.render) {
vm.$options.render = emptyVNode
if (process.env.NODE_ENV !== 'production') {
/* istanbul ignore if */
if (vm.$options.template) {
warn(
'You are using the runtime-only build of Vue where the template ' +
'option is not available. Either pre-compile the templates into ' +
'render functions, or use the compiler-included build.',
vm
)
} else {
warn(
'Failed to mount component: template or render function not defined.',
vm
)
}
}
}
callHook(vm, 'beforeMount')
vm._watcher = new Watcher(vm, () => {
vm._update(vm._render(), hydrating)
}, noop)
hydrating = false
// root instance, call mounted on self
// mounted is called for child components in its inserted hook
if (vm.$root === vm) {
vm._isMounted = true
callHook(vm, 'mounted')
}
return vm
}
Vue.prototype._update = function (vnode: VNode, hydrating?: boolean) {
const vm: Component = this
if (vm._isMounted) {
callHook(vm, 'beforeUpdate')
}
const prevEl = vm.$el
const prevActiveInstance = activeInstance
activeInstance = vm
const prevVnode = vm._vnode
vm._vnode = vnode
if (!prevVnode) {
// Vue.prototype.__patch__ is injected in entry points
// based on the rendering backend used.
vm.$el = vm.__patch__(vm.$el, vnode, hydrating)
} else {
vm.$el = vm.__patch__(prevVnode, vnode)
}
activeInstance = prevActiveInstance
// update __vue__ reference
if (prevEl) {
prevEl.__vue__ = null
}
if (vm.$el) {
vm.$el.__vue__ = vm
}
// if parent is an HOC, update its $el as well
if (vm.$vnode && vm.$parent && vm.$vnode === vm.$parent._vnode) {
vm.$parent.$el = vm.$el
}
if (vm._isMounted) {
callHook(vm, 'updated')
}
}
Vue.prototype._updateFromParent = function (
propsData: ?Object,
listeners: ?Object,
parentVnode: VNode,
renderChildren: ?VNodeChildren
) {
const vm: Component = this
const hasChildren = !!(vm.$options._renderChildren || renderChildren)
vm.$options._parentVnode = parentVnode
vm.$options._renderChildren = renderChildren
// update props
if (propsData && vm.$options.props) {
observerState.shouldConvert = false
if (process.env.NODE_ENV !== 'production') {
observerState.isSettingProps = true
}
const propKeys = vm.$options._propKeys || []
for (let i = 0; i < propKeys.length; i++) {
const key = propKeys[i]
vm[key] = validateProp(key, vm.$options.props, propsData, vm)
}
observerState.shouldConvert = true
if (process.env.NODE_ENV !== 'production') {
observerState.isSettingProps = false
}
}
// update listeners
if (listeners) {
const oldListeners = vm.$options._parentListeners
vm.$options._parentListeners = listeners
vm._updateListeners(listeners, oldListeners)
}
// resolve slots + force update if has children
if (hasChildren) {
vm.$slots = resolveSlots(renderChildren)
vm.$forceUpdate()
}
}
Vue.prototype.$forceUpdate = function () {
const vm: Component = this
if (vm._watcher) {
vm._watcher.update()
}
}
Vue.prototype.$destroy = function () {
const vm: Component = this
if (vm._isBeingDestroyed) {
return
}
callHook(vm, 'beforeDestroy')
vm._isBeingDestroyed = true
// remove self from parent
const parent = vm.$parent
if (parent && !parent._isBeingDestroyed && !vm.$options.abstract) {
remove(parent.$children, vm)
}
// teardown watchers
if (vm._watcher) {
vm._watcher.teardown()
}
let i = vm._watchers.length
while (i--) {
vm._watchers[i].teardown()
}
// remove reference from data ob
// frozen object may not have observer.
if (vm._data.__ob__) {
vm._data.__ob__.vmCount--
}
// call the last hook...
vm._isDestroyed = true
callHook(vm, 'destroyed')
// turn off all instance listeners.
vm.$off()
// remove __vue__ reference
if (vm.$el) {
vm.$el.__vue__ = null
}
}
}
export function callHook (vm: Component, hook: string) {
const handlers = vm.$options[hook]
if (handlers) {
for (let i = 0, j = handlers.length; i < j; i++) {
handlers[i].call(vm)
}
}
vm.$emit('hook:' + hook)
}