win32中WM_MOUSEWHEEL消息响应

最新推荐文章于 2023-05-02 16:48:44 发布

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本文详细解析了wParam参数中低序字节指示的各种虚拟按键状态，包括Ctrl、Shift键及鼠标左右键等的状态信息，并且介绍了高序字节如何表示鼠标滚轮的旋转距离，该距离以WHEEL_DELTA的倍数或分数形式给出。

wParam

The low-order word indicates whether various virtual keys are down. This parameter can be one or more of the following values.

Value	Description
MK_CONTROL	The CTRL key is down.
MK_LBUTTON	The left mouse button is down.
MK_MBUTTON	The middle mouse button is down.
MK_RBUTTON	The right mouse button is down.
MK_SHIFT	The SHIFT key is down.
MK_XBUTTON1	Windows 2000: The first X button is down.
MK_XBUTTON2	Windows 2000: The second X button is down.

The high-order word indicates the distance the wheel is rotated, expressed in multiples or divisions of WHEEL_DELTA, which is 120. A positive value indicates that the wheel was rotated forward, away from the user; a negative value indicates that the wheel was rotated backward, toward the user.