__init__.py 文件源码

def on_mouse_scroll(x, y, scroll_x, scroll_y):
            """The mouse wheel was scrolled.

            Note that most mice have only a vertical scroll wheel, so
            `scroll_x` is usually 0.  An exception to this is the Apple Mighty
            Mouse, which has a mouse ball in place of the wheel which allows
            both `scroll_x` and `scroll_y` movement.

            :Parameters:
                `x` : int
                    Distance in pixels from the left edge of the window.
                `y` : int
                    Distance in pixels from the bottom edge of the window.
                `scroll_x` : int
                    Number of "clicks" towards the right (left if negative).
                `scroll_y` : int
                    Number of "clicks" upwards (downwards if negative).

            :event:
            """