WPF是否有鼠标滚轮上下滚动事件

Question

I checked msdn. For event related to mouse wheel , there is only one option -- UIElement.MouseWheel

What I want to do is listening to mouse wheel scrolling forward(up) and backward(down) event.

Note: Not clicking the middle wheel button.

Answer 1

No, there is just one event. When you look at the MouseWheelEventArgs class there is a property Delta. Delta is positive when the wheel is rotated away from the user and negative when the wheel is rotated toward the user.

Answer 2

For event related to mouse wheel, there is only one option

No, there are others.

There is also the PreviewMouseWheel ( which functions just like the MouseWheel event and the below code code can be used too ).

The Preview, if needed, has a Delta property too which gives the direction of the wheel.

Example

private void PreviewMouseWheel(object sender, MouseWheelEventArgs e)
{
    if (e.Delta > 0)
        DoActionUp();

    else if (e.Delta < 0)
        DoActionDown();
}