我對pygame有點陌生，在試圖回到它的時候，我發現了“用多態性替換你的條件”的建議。大多數 pygame 教程建議使用“for event in pygame.event.get（）”循環，然后使用條件來確定是否發生了任何特定事件。1：如何使用多態函數編寫該代碼 2：是否值得重構代碼，或者只是將條件保持原樣以下是大多數教程推薦的內容def gameloop():"""Stuff that comes before the event-loop"""for event in pygame.event.get(): if event.type == pygame.QUIT: # This is the conditional I want to remove quit_functions()以下是我想如何做到這一點from abc import ABC, abstractmethodimport pygamedef detect_event(event_class_name): for event in pygame.event.get(): # This is how I want to get the event and then assign it a function event_class_name.determine_event(event)# Above: I want to use this function to detect events and call their functions# Below: This is how I want to assign functions to the eventsclass EventHandler(ABC): @staticmethod @abstractmethod def determine_event(event): passclass Exit(EventHandler): @staticmethod # How do I identify this with the event-type "pygame.QUIT," for example def determine_event(event): pygame.quit() quit(0)
3 回答
BIG陽
TA貢獻1859條經驗 獲得超6個贊
在 pygame 中，事件類型是枚舉器常量。必須將此常量映射到相應的類。使用字典：
def Exit(event):
# [...]
def Keydown():
# [...]
eventhandler = {pygame.QUIT: Exit, pygame.KEYDOWN: Keydown}
當然，字典也可以動態生成甚至擴展。（例如：eventhandler[pygame.MOUSEBUTTONDOWN] = MouseDown)
必須將事件委托給在事件處理程序中分配的相應操作：
while True:
for event in pygame.event.get():
if event.type in eventhandler:
eventhandler[event.type](event)
例：
class EventHandler():
@staticmethod
def determine_event(event): pass
class Exit(EventHandler):
@staticmethod
def determine_event(event):
pygame.quit()
quit(0)
class Keydown(EventHandler):
@staticmethod
def determine_event(event):
print(event.key)
eventhandler = {pygame.QUIT: Exit, pygame.KEYDOWN: Keydown}
while True:
for event in pygame.event.get():
if event.type in eventhandler:
eventhandler[event.type].determine_event(event)
對于更通用的方法，可以在列表中管理處理程序。因此，可以將多個操作關聯到一個事件類型：
def Exit(event):
# [...]
def Keydown1():
# [...]
def Keydown2():
# [...]
eventhandler = {pygame.QUIT: [Exit], pygame.KEYDOWN: [Keydown1, Keydown2]}
while True:
for event in pygame.event.get():
if event.type in eventhandler:
for target in eventhandler[event.type]:
target(event)
例：
class EventHandler():
targets = {}
@staticmethod
def add(type, event):
EventHandler.targets.setdefault(type, []).append(event)
@staticmethod
def notify(event):
if event.type in EventHandler.targets:
for target in EventHandler.targets[event.type]:
target.determine_event(event)
@staticmethod
def determine_event(event): pass
class Exit(EventHandler):
@staticmethod
def determine_event(event):
pygame.quit()
quit(0)
class KeydownPrint(EventHandler):
@staticmethod
def determine_event(event):
print(event.key)
class KeydownAction(EventHandler):
@staticmethod
def determine_event(event):
print("action")
EventHandler.add(pygame.QUIT, Exit)
EventHandler.add(pygame.KEYDOWN, KeydownPrint)
EventHandler.add(pygame.KEYDOWN, KeydownAction)
while True:
for event in pygame.event.get():
EventHandler.notify(event)
或者甚至是兩個答案的組合（參見@AKX的答案）：
class EventHandler:
targets = {}
def register(type):
def decorator(fn):
EventHandler.targets.setdefault(type, []).append(fn)
return decorator
def notify(event):
fnl = EventHandler.targets[event.type] if event.type in EventHandler.targets else []
for fn in fnl:
fn(event)
@EventHandler.register(pygame.QUIT)
def onExit(event):
pygame.quit()
quit(0)
@EventHandler.register(pygame.KEYDOWN)
def keydownPrint(event):
print(event.key)
@EventHandler.register(pygame.KEYDOWN)
def keydownAction(event):
print("action")
while True:
for event in pygame.event.get():
EventHandler.notify(event)
慕碼人8056858
TA貢獻1803條經驗 獲得超6個贊
你不需要使用帶有靜態方法的類，并且基于Rabbid76的答案進行構建，一種（恕我直言）優雅的方法是使用裝飾器在dict中注冊每個事件處理程序：
import pygame
event_handler_registry = {}
def register_event_handler(event):
def decorator(fn):
event_handler_registry[event] = fn
return fn
return decorator
@register_event_handler(pygame.QUIT)
def on_exit(event):
pygame.quit()
quit(0)
@register_event_handler(pygame.KEYDOWN)
def on_key_down(event):
print(event.key)
while True:
for event in pygame.event.get():
event_handler = event_handler_registry.get(event.type)
if event_handler:
event_handler(event)
else:
print(f"No event handler for {event}")
慕妹3242003
TA貢獻1824條經驗 獲得超6個贊
也許你可以用一個字符串使用eval（）：
EVENTS = {
pygame.QUIT : "quit_handler()" ,
pygame.MOUSEBUTTONDOWN: "click_handler(event)"
}
for event in pygame.event.get:
eval (EVENTS.get(event.type))
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