pygame KEYDOWN 事件和按键事件 [英] pygame KEYDOWN event and key events

问题描述

有一个问题在使用 pygame 开发游戏时并不重要，但它一直困扰着我一段时间.

Hi there is an issue that doesn't really matter when developing a game with pygame but that kept on bothering me for a while.

    while not gameExit:
        for event in pygame.event.get():e
            if event.type == pygame.KEYDOWN:
                if event.key == pygame.K_RIGHT:
                    pass

所以上面是一个工作代码，我相信

so above is a working code and I believe

    while not gameExit:
        for event in pygame.event.get():e
            if event.type == pygame.KEYDOWN and event.key == pygame.K_RIGHT:
                pass

同样有效.

然而，当我尝试类似event.key == pygame.K_RIGHT:"之类的东西时，python 给我一个错误，说没有属性key".虽然我知道选择以上 2 个代码而不是event.key == pygame.K_RIGHT:"更合理，但我不知道为什么 pygame 会说事件没有属性 'key' 而什么时候我只是检查 event.type == pygame.KEYDOWN pygame 执行event.key == pygame.K_RIGHT"是否没有问题.

However, when I just try something like "event.key == pygame.K_RIGHT:", python gives me an error saying there is no attribute 'key'. While I know it'd be more reasonable to choose above 2 codes over just "event.key == pygame.K_RIGHT:", I don't know why pygame would say the event doesn't have the attribute 'key' while when I simply check if event.type == pygame.KEYDOWN pygame will have no problem executing "event.key == pygame.K_RIGHT".

会不会是检查 event.type == pygame.KEYDOWN 是否真的为事件生成了key"属性?

Could it be that checking if event.type == pygame.KEYDOWN actually generates a 'key' attribute for the event?

推荐答案

并非每个事件都具有所有可能的属性.这就是为什么你必须首先检查事件的类型.

Not every event has all possbile attributes. that's why you have to check the type of the event first.

这里是每个事件类型的所有属性的列表:

Here's a list of all attributes for each event type:

QUIT             none
ACTIVEEVENT      gain, state
KEYDOWN          unicode, key, mod
KEYUP            key, mod
MOUSEMOTION      pos, rel, buttons
MOUSEBUTTONUP    pos, button
MOUSEBUTTONDOWN  pos, button
JOYAXISMOTION    joy, axis, value
JOYBALLMOTION    joy, ball, rel
JOYHATMOTION     joy, hat, value
JOYBUTTONUP      joy, button
JOYBUTTONDOWN    joy, button
VIDEORESIZE      size, w, h
VIDEOEXPOSE      none
USEREVENT        code

如您所见，只有 KEYDOWN 和 KEYUP 事件具有 key 属性.

As you can see, only KEYDOWN and KEYUP events have the key attribute.

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