[WPF自定义控件库] 关于ScrollViewr和滚动轮劫持(scroll-wheel-hijack)

1. 甚么是转动轮劫持

这篇文章介绍一个很简略的继承自ScrollViewer的控件：

public class ExtendedScrollViewer : ScrollViewer
{
    protected override void OnMouseWheel(MouseWheelEventArgs e)
    {
        if (ViewportHeight + VerticalOffset >= ExtentHeight && e.Delta <= 0)
            return;

        if (VerticalOffset == 0 && e.Delta >= 0)
            return;

        base.OnMouseWheel(e);
    }
}public