From 0694a9bfb63350d2cb7ed992fee82e6a632ec74a Mon Sep 17 00:00:00 2001
From: Evan You <yyx990803@gmail.com>
Date: Tue, 12 Apr 2016 23:23:32 -0400
Subject: [PATCH] lifecycle hooks

---
 src/runtime-with-compiler.js      |  2 +-
 src/runtime/instance/index.js     | 28 +++++++++++-----------
 src/runtime/instance/lifecycle.js | 39 ++++++++++++++++++++++++++-----
 src/runtime/instance/render.js    |  5 ++++
 4 files changed, 52 insertions(+), 22 deletions(-)

diff --git a/src/runtime-with-compiler.js b/src/runtime-with-compiler.js
index 91ef02c6..213f40ae 100644
--- a/src/runtime-with-compiler.js
+++ b/src/runtime-with-compiler.js
@@ -1,6 +1,6 @@
 import config from './runtime/config'
 import { compile } from './compiler/index'
-import { getOuterHTML, extend, query, warn } from './runtime/util/index'
+import { getOuterHTML, query, warn } from './runtime/util/index'
 import Vue from './runtime/index'
 
 const mount = Vue.prototype.$mount
diff --git a/src/runtime/instance/index.js b/src/runtime/instance/index.js
index d3a2a493..6b06f0d0 100644
--- a/src/runtime/instance/index.js
+++ b/src/runtime/instance/index.js
@@ -1,36 +1,34 @@
 import { initState, stateMixin } from './state'
 import { initRender, renderMixin } from './render'
 import { initEvents, eventsMixin } from './events'
-import { initLifecycle, lifecycleMixin } from './lifecycle'
+import { initLifecycle, lifecycleMixin, callHook } from './lifecycle'
 import { nextTick, mergeOptions } from '../util/index'
 
 let uid = 0
 
 export default function Vue (options) {
-  options = options || {}
-
-  this.$parent = options.parent
-  this.$root = this.$parent
-    ? this.$parent.$root
-    : this
-  this.$children = []
-  this.$refs = {}       // child vm references
-  this.$els = {}        // element references
-
   // a uid
   this._uid = uid++
   // a flag to avoid this being observed
   this._isVue = true
 
-  options = this.$options = mergeOptions(
+  this.$parent = options && options.parent
+  this.$root = this.$parent ? this.$parent.$root : this
+  this.$refs = {}
+  this.$els = {}
+
+  // merge options
+  this.$options = mergeOptions(
     this.constructor.options,
-    options,
+    options || {},
     this
   )
 
-  initState(this)
-  initEvents(this)
   initLifecycle(this)
+  initEvents(this)
+  callHook(this, 'init')
+  initState(this)
+  callHook(this, 'created')
   initRender(this)
 }
 
diff --git a/src/runtime/instance/lifecycle.js b/src/runtime/instance/lifecycle.js
index 842ea1cf..4e17c97d 100644
--- a/src/runtime/instance/lifecycle.js
+++ b/src/runtime/instance/lifecycle.js
@@ -1,13 +1,40 @@
-export function initLifecycle (vm) {
+export function callHook (vm, hook) {
+  vm.$emit('pre-hook:' + hook)
+  var handlers = vm.$options[hook]
+  if (handlers) {
+    for (var i = 0, j = handlers.length; i < j; i++) {
+      handlers[i].call(vm)
+    }
+  }
+  vm.$emit('hook:' + hook)
+}
 
+export function initLifecycle (vm) {
+  vm._isDestroyed = false
+  vm._isBeingDestroyed = false
 }
 
 export function lifecycleMixin (Vue) {
-  Vue.prototype.$mount = function () {
-
-  }
-
   Vue.prototype.$destroy = function () {
-
+    if (this._isDestroyed) {
+      return
+    }
+    this._callHook('beforeDestroy')
+    this._isBeingDestroyed = true
+    // teardown watchers
+    let i = this._watchers.length
+    while (i--) {
+      this._watchers[i].teardown()
+    }
+    // remove reference from data ob
+    // frozen object may not have observer.
+    if (this._data.__ob__) {
+      this._data.__ob__.removeVm(this)
+    }
+    // call the last hook...
+    this._isDestroyed = true
+    this._callHook('destroyed')
+    // turn off all instance listeners.
+    this.$off()
   }
 }
diff --git a/src/runtime/instance/render.js b/src/runtime/instance/render.js
index ef102b27..e631b864 100644
--- a/src/runtime/instance/render.js
+++ b/src/runtime/instance/render.js
@@ -1,6 +1,7 @@
 import Watcher from '../observer/watcher'
 import { query } from '../util/index'
 import { h, patch } from '../vdom/index'
+import { callHook } from './lifecycle'
 
 export function initRender (vm) {
   const el = vm.$options.el
@@ -13,19 +14,23 @@ export function renderMixin (Vue) {
   Vue.prototype.__h__ = h
 
   Vue.prototype._update = function (vtree) {
+    callHook(this, 'beforeUpdate')
     if (!this._tree) {
       patch(this.$el, vtree)
     } else {
       patch(this._tree, vtree)
     }
     this._tree = vtree
+    callHook(this, 'updated')
   }
 
   Vue.prototype.$mount = function (el) {
+    callHook(this, 'beforeMount')
     this.$el = el ? query(el) : document.createElement('div')
     this.$el.innerHTML = ''
     this._watcher = new Watcher(this, this.$options.render, this._update)
     this._update(this._watcher.value)
+    callHook(this, 'mounted')
   }
 
   Vue.prototype.$forceUpdate = function () {