c# - 如何将鼠标滚轮事件中的计时器间隔更改为快和慢？

Question

代码:

private void Form1_MouseWheel(object sender, MouseEventArgs e)
        {
            if (leave == true)
            {
                timer1.Interval = 10;
            }
        }

我想这样做，如果我将鼠标滚轮向下转动，它会减慢计时器并增加间隔时间，如果我向上转动鼠标滚轮，它会减少间隔时间。

我该怎么做？

Answer 1

使用MouseEventArgs.Delta属性(property)

The mouse wheel combines the features of a wheel and a mouse button. The wheel has discrete, evenly spaced notches. When you rotate the wheel, a wheel message is sent as each notch is encountered. One wheel notch, a detent, is defined by the windows constant 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).

private void Form1_MouseWheel(object sender, MouseEventArgs e)
{
    if (e.Delta > 0) //moved forward
    {
        timer1.Interval += 1000;
    }
    else //moved backword
    {
        timer1.Interval -= 1000;
    }
}