Pygame的MOUSEWHEEL事件

Coding 0 Comments

Pygame 团队在 Pygame 版本1.9.5加入了事件MOUSEWHEEL。官方文档是这么说的：

When compiled with SDL2, pygame has these additional events and their attributes.

AUDIODEVICEADDED   which, iscapture
AUDIODEVICEREMOVED which, iscapture
FINGERMOTION       touch_id, finger_id, x, y, dx, dy
FINGERDOWN         touch_id, finger_id, x, y, dx, dy
FINGERUP           touch_id, finger_id, x, y, dx, dy
MOUSEWHEEL         which, flipped, x, y, touch
MULTIGESTURE       touch_id, x, y, pinched, rotated, num_fingers
TEXTEDITING        text, start, length
TEXTINPUT          text

New in pygame 1.9.5.

Changed in pygame 2.0.2: Fixed amount horizontal scroll (x, positive to the right and negative to the left).

Changed in pygame 2.0.2: The touch attribute was added to all the MOUSE events.

接下来，我会编写一个捕获事件的函数：

def handleEvent():
    eventList = pygame.event.get()
    for event in eventList:
        # Exit
        if event.type == WINDOWCLOSE:
            pygame.quit()
        # Mouse wheel
        if event.type == pygame.MOUSEWHEEL:
            # Do some thing
            print(event.y)

这个时候，event（单个event对象）的y就是鼠标竖直滚动量。event.y为正，即向上滚动；反之，event.y为负。event.y代表滚动量（取决于你的滚轮滚得快还是慢）。

在一些先进的笔记本电脑上，触摸板向左、向右滑动反映在event.x里。具体请参阅Pygame文档。