Gets a signed count of the number of detents the mouse wheel has rotated, multiplied by the WHEEL_DELTA constant.
获取鼠标轮已转动的制动器数的有符号计数乘以WHEEL_DELTA常数。
A signed count of the number of detents the mouse wheel has rotated.
鼠标轮已转动的制动器数的有符号计数。
How many detents do we need in a hardware knob?
一个硬件旋钮上我们需要多少销键?
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