彩票走势图

　　当ScrollViewer里包含很多子控件时，默认情况下只能用鼠标手动拖动(或滚轮)滚动条以实现内容的滚动，假如用户是键盘高手，习惯于用Tab键来切换子控件焦点时，即使当前获得焦点的控件在不可见区域，滚动条也不会自动跟随着滚动到相应位置，这个非常不方便，今天在网上看到一个老外的解决办法，代码转贴于此：

01 private void _ScrollViewer_GotFocus(object sender, RoutedEventArgs e)

02 {

03 FrameworkElement element = e.OriginalSource as FrameworkElement;

04

05 if (element != null)

06 {

07 ScrollViewer scrollViewer = sender as ScrollViewer;

08 scrollViewer.ScrollToVerticalOffset(GetVerticalOffset(element, scrollViewer));

09 }

10

11 }

12

13 private double GetVerticalOffset(FrameworkElement child, ScrollViewer scrollViewer)

14 {

15 // Ensure the control is scrolled into view in the ScrollViewer.

16 GeneralTransform focusedVisualTransform = child.TransformToVisual(scrollViewer);

17 Point topLeft = focusedVisualTransform.Transform(new Point(child.Margin.Left, child.Margin.Top));

18 Rect rectangle = new Rect(topLeft, child.RenderSize);

19 double newOffset = scrollViewer.VerticalOffset + (rectangle.Bottom - scrollViewer.ViewportHeight);

20 return newOffset < 0 ? 0 : newOffset; // no use returning negative offset

21 }

　　即：给ScrollViewer的GotFocus事件增加_ScrollViewer_GotFocus处理方法，然后计算当前获取焦点的控件与ScorllViewer的偏移距离，最终得出滚动条应该滚动的偏移量。