page.js

'use strict'

var fns = require('./lib/fns.js')
var message = require('./lib/message')
var redirector = require('./lib/redirector')
var cache = require('./lib/cache')
var C = require('./lib/component')
var bridge = require('./lib/bridge')
var _conf = require('./lib/conf')
var dispatcher = new message()
var hasPageLoaded = 0
var isAppLaunched = 0
var isAppShowed = 0
var hideTime = 0
var modules = {
	fns, redirector, cache, message, dispatcher,
	channel: bridge.channel
}
bridge.ref(C.getRef)
bridge.dispatcher(dispatcher)
C.dispatcher(dispatcher)
function WXPage(name, option) {
	if (fns.type(name) == 'object') {
		option = name
		name = option.name || '_unknow'
	}
	// page internal message
	var emitter = new message()

	// extend page config
	var extendPageBefore = _conf.get('extendPageBefore')
	extendPageBefore && extendPageBefore(name, option, modules)

	// mixin component defs
	// C.use(option, option.comps, `Page[${name}]`, emitter)
	if (option.onNavigate){
		let onNavigateHandler = function (url, query) {
			option.onNavigate({url, query})
		}
		console.log(`Page[${name}] define "onNavigate".`)
		dispatcher.on('navigateTo:'+name, onNavigateHandler)
		dispatcher.on('redirectTo:'+name, onNavigateHandler)
		dispatcher.on('switchTab:'+name, onNavigateHandler)
		dispatcher.on('reLaunch:'+name, onNavigateHandler)
	}
	/**
	 * Preload lifecycle method
	 */
	if (option.onPreload){
		console.log(`Page[${name}] define "onPreload".`)
		dispatcher.on('preload:'+name, function (url, query) {
			option.onPreload({url, query})
		})
	}
	/**
	 * Instance props
	 */
	option.$state = {
		// 是否小程序被打开首页启动页面
		firstOpen: false
	}
	option.$emitter = emitter
	bridge.methods(option)

	/**
	 * Cross pages message methods
	 */
	option.$on = function () {
		return dispatcher.on.apply(dispatcher, arguments)
	}
	option.$emit = function () {
		return dispatcher.emit.apply(dispatcher, arguments)
	}
	option.$off = function () {
		return dispatcher.off.apply(dispatcher, arguments)
	}
	/**
	 * 父子通信枢纽模块
	 */
	option.$ = bridge.mount
	/**
	 * setData wrapper, for component setData with prefix
	 * @param {String} prefix prefix of component's data
	 * @param {Object} data
	 */
	option.$setData = function (prefix, data) {
		if (fns.type(prefix) == 'string') {
			var props = {}
			fns.objEach(data, function (k,v) {
				props[prefix + '.' + k] = v
			})
			return this.setData(props)
		} else if (fns.type(prefix) == 'object') {
			return this.setData(prefix)
		}
	}
	/**
	 * AOP life-cycle methods hook
	 */
	option.onLoad = fns.wrapFun(option.onLoad, function() {
		// After onLoad, onAwake is valid if defined
		option.onAwake && message.on('app:sleep', (t) => {
			option.onAwake.call(this, t)
		})
		if (!hasPageLoaded) {
			hasPageLoaded = true

			let $state = this.$state
			$state.firstOpen = true
		}
	})
	option.onReady = fns.wrapFun(option.onReady, function () {
		redirector.emit('page:ready')
	})

	// call on launch
	if (option.onPageLaunch) {
		option.onPageLaunch()
	}
	if (option.onAppLaunch) {
		isAppLaunched ? option.onAppLaunch.apply(option, isAppLaunched) : dispatcher.on('app:launch', function (args) {
			option.onAppLaunch.apply(option, args)
		})
	}
	if (option.onAppShow) {
		isAppLaunched ? option.onAppShow.apply(option, isAppLaunched) : dispatcher.on('app:show', function (args) {
			option.onAppShow.apply(option, args)
		})
	}

	// extend page config
	var extendPageAfter = _conf.get('extendPageAfter')
	extendPageAfter && extendPageAfter(name, option, modules)
	// register page
	Page(option)
	return option;
}
/**
 * 由重定向模块转发到页面内派发器
 */
bridge.redirectDelegate(redirector, dispatcher)
/**
 * Application wrapper
 */
function Application (option) {

	if (!option.config || !option.config.route || !option.config.route.length) {
		throw new Error('config.route is necessary !')
	}
	if (option.config) {
		WXPage.config(option.config)
	}
	var ctx = option
	/**
	 * APP sleep logical
	 */
	option.onShow = option.onShow ? fns.wrapFun(option.onShow, appShowHandler) : appShowHandler
	option.onHide = option.onHide ? fns.wrapFun(option.onHide, appHideHandler) : appHideHandler
	option.onLaunch = option.onLaunch ? fns.wrapFun(option.onLaunch, appLaunchHandler) : appLaunchHandler
	option.onLaunch = fns.wrapFun(option.onLaunch, function () {
		ctx = this
	})
	if (option.onAwake) {
		message.on('app:sleep', function(t){
			option.onAwake.call(ctx, t)
		})
	}
	/**
	 * Use app config
	 */
	App(option)
}
function appLaunchHandler() {
	isAppLaunched = [].slice.call(arguments)
	message.emit('app:launch', isAppLaunched)
}
function appShowHandler () {
	try {
		if (!isAppShowed) {
			// call onAppShow only once
			isAppShowed = [].slice.call(arguments)
			message.emit('app:show', isAppShowed)
		}
	} finally {
		if (!hideTime) return
		var t = hideTime
		hideTime = 0
		message.emit('app:sleep', new Date() - t)
	}
}
function appHideHandler() {
	hideTime = new Date()
}

Page.P = WXPage
Page.C = Component.C = WXPage.C = WXPage.Comp = WXPage.Component = C
Page.A = App.A = WXPage.A = WXPage.App = WXPage.Application = Application
WXPage.redirector = redirector
WXPage.message = message
WXPage.cache = cache
WXPage.fns = fns
WXPage.getPageName = bridge.getPageName

/**
 * Config handler
 */

WXPage.config = function (key, value) {
	if (fns.type(key) == 'object') {
		fns.objEach(key, function (k, v) {
			_conf.set(k, v)
		})
	} else {
		_conf.set(key, value)
	}
	return this
}
message.assign(WXPage)
message.assign(C)
message.assign(Application)
module.exports = WXPage