问在WPF中检测用户源滚动

EN

private volatile bool isUserScroll = true;
public bool IsAutoScrollEnabled { get; set; }

// Items is the collection with the items displayed in the ListView

private void DoAutoscroll(object sender, EventArgs e)
{
    if(!IsAutoScrollEnabled)
        return;
    var lastItem = Items.LastOrDefault();
    if (lastItem != null)
    {
        isUserScroll = false;
        logView.ScrollIntoView(lastItem);
    }
}

private void scrollViewer_ScrollChanged(object sender, ScrollChangedEventArgs e)
{
    if (e.VerticalChange == 0.0)
        return;

    if (isUserScroll)
    {
        if (e.VerticalChange > 0.0)
        {
            double scrollerOffset = e.VerticalOffset + e.ViewportHeight;
            if (Math.Abs(scrollerOffset - e.ExtentHeight) < 5.0)
            {
                // The user has tried to move the scroll to the bottom, activate autoscroll.
                IsAutoScrollEnabled = true;
            }
        }
        else
        {
            // The user has moved the scroll up, deactivate autoscroll.
            IsAutoScrollEnabled = false;
        }
    }
    isUserScroll = true;
}