/*
* ListBox鼠标按下
*/
private void listbox_PreviewMouseDown(object sender, MouseEventArgs e)
{
isMoving = false;
storyboard.Seek(TimeSpan.FromMilliseconds(400));
ListBox listbox1 = (ListBox)sender;
ScrollViewer sv = FindVisualChild <ScrollViewer>(listbox1);
isMouseDown = true;
startX = e.GetPosition(this).X;
controlX = e.GetPosition(this).X;
// this.offsetLeft = sv.HorizontalOffset;
offsetLeft = turnImageWhich * listbox1.Width;
moveX = 0;
turnImage_Timer.Stop();
// listbox1.CaptureMouse();
//textbox1.Text = "开始拖动" + offsetLeft;
listbox1.CaptureMouse();
e.Handled = true;
}