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| import {
avalon
} from '../seed/core'
import {
runActions,
collectDeps
} from './transaction'
import {
createGetter,
createSetter
} from "../parser/index"
export var actionUUID = 1
//需要重构
export function Action(vm, options, callback) {
for (var i in options) {
if (protectedMenbers[i] !== 1) {
this[i] = options[i]
}
}
this.vm = vm
this.observers = []
this.callback = callback
this.uuid = ++actionUUID
this.ids = ''
this.mapIDs = {} //这个用于去重
this.isAction = true
var expr = this.expr
// 缓存取值函数
if (typeof this.getter !== 'function') {
this.getter = createGetter(expr, this.type)
}
// 缓存设值函数（双向数据绑定）
if (this.type === 'duplex') {
this.setter = createSetter(expr, this.type)
}
// 缓存表达式旧值
this.value = NaN
// 表达式初始值 & 提取依赖
if (!(this.node)) {
this.value = this.get()
}
}
Action.prototype = {
getValue() {
var scope = this.vm
try {
return this.getter.call(scope, scope)
} catch (e) {
avalon.log(this.getter + ' exec error')
}
},
setValue(value) {
var scope = this.vm
Eif (this.setter) {
this.setter.call(scope, scope, value)
}
},
// get --> getValue --> getter
get(fn) {
var name = 'action track ' + this.type
if (this.deep) {
avalon.deepCollect = true
}
var value = collectDeps(this, this.getValue)
if (this.deep && avalon.deepCollect) {
avalon.deepCollect = false
}
return value
},
/**
* 在更新视图前保存原有的value
*/
beforeUpdate() {
return this.oldValue = getPlainObject(this.value)
},
update(args, uuid) {
var oldVal = this.beforeUpdate()
var newVal = this.value = this.get()
var callback = this.callback
if (callback && this.diff(newVal, oldVal, args)) {
callback.call(this.vm, this.value, oldVal, this.expr)
}
this._isScheduled = false
},
schedule() {
if (!this._isScheduled) {
this._isScheduled = true
Eif (!avalon.uniqActions[this.uuid]) {
avalon.uniqActions[this.uuid] = 1
avalon.pendingActions.push(this)
}
runActions() //这里会还原_isScheduled
}
},
removeDepends() {
var self = this
this.observers.forEach(function(depend) {
avalon.Array.remove(depend.observers, self)
})
},
/**
* 比较两个计算值是否,一致,在for, class等能复杂数据类型的指令中,它们会重写diff复法
*/
diff(a, b) {
return a !== b
},
/**
* 销毁指令
*/
dispose() {
this.value = null
this.removeDepends()
if (this.beforeDispose) {
this.beforeDispose()
}
for (var i in this) {
delete this[i]
}
}
}
function getPlainObject(v) {
if (v && typeof v === 'object') {
if (v && v.$events) {
return v.$model
} else if (Array.isArray(v)) {
let ret = []
for (let i = 0, n = v.length; i < n; i++) {
ret.push(getPlainObject(v[i]))
}
return ret
} else {
let ret = {}
for (let i in v) {
ret[i] = getPlainObject(v[i])
}
return ret
}
} else {
return v
}
}
export var protectedMenbers = {
vm: 1,
callback: 1,
observers: 1,
oldValue: 1,
value: 1,
getValue: 1,
setValue: 1,
get: 1,
removeDepends: 1,
beforeUpdate: 1,
update: 1,
//diff
//getter
//setter
//expr
//vdom
//type: "for"
//name: "ms-for"
//attrName: ":for"
//param: "click"
//beforeDispose
dispose: 1
}
|