##master-page:HomepageTemplate
##master-date:2004-01-29 23:45:45
#format wiki
#language zh
== Action模式实现 ==
                        --- by [[huangyi]] [[yi.codeplayer@gmail.com]]


今天看到 [[http://harkal.sylphis3d.com/2005/08/10/multithreaded-game-scripting-with-stackless-python/|这篇好文]], 里面有一部分讲到Action模式在游戏里面的应用, 感觉有点意思就随手写了写, 总算赶在熄灯之前搞定, 呵呵。
希望这半桶水的英文注释不会让你感觉太头疼 :)

{{{#!python
class Action(object):
	reg_after = {}
	reg_before = {}
	def __init__(self,func):
		self.internal = func
	def __call__(self):
		'''excute all actions registered to excute before self,
		then excute self,
		last excute all actions registered to excute after self.'''
		if self.reg_before.has_key(self):
			acs = self.reg_before[self]
			for a in acs:
				a()
		self.internal()
		if self.reg_after.has_key(self):
			acs = self.reg_after[self]
			for a in acs:
				a()
	def before(self,action):
		'register self take place before action' 
		self.register(action,self,self.reg_before)
	def after(self,action):
		'register self take place after action' 
		self.register(action,self,self.reg_after)
	@staticmethod
	def register(ac1,ac2,reg):
		if reg.has_key(ac1):
			reg[ac1].append(ac2)
		else:reg[ac1]=[ac2]

class Door(object):
	def __init__(self,no):
		self.no = no
		self.Open = Action(self.ac_Open)
	def ac_Open(self):
		print 'door',self.no,'open'

class Player(object):
	def __init__(self,name):
		self.name = name
		self.Die = Action(self.ac_Die)
	def ac_Die(self):
		print self.name,'player die'

class Beer(object):
	def __init__(self,no):
		self.no = no
		self.Start = Action(self.ac_Start)
	def ac_Start(self):
		print 'beer',self.no,'start' 

if __name__ =='__main__':
	player = Player('hy')
	door = Door(1)
	beer = Beer(1)
	door.Open.before(player.Die)
	beer.Start.after(door.Open)
	player.Die()
}}}
...


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