1     /// 
 2     /// 可触摸滚动的ScrollViewer控件 3     /// 
 4     public class TouchableScrollViewer : ScrollViewer 5     { 6         //触摸点的坐标 7         Point _startPosition; 8         //滚动条当前位置 9         double _startVerticalOffset;10         double _startHorizontalOffset;11         public TouchableScrollViewer()12         {13             TouchDown += TouchableScrollViewer_TouchDown;14 15             TouchUp += TouchableScrollViewer_TouchUp;16         }17         private void TouchableScrollViewer_TouchDown(object sender, TouchEventArgs e)18         {19             //添加触摸移动监听20             TouchMove -= TouchableScrollViewer_TouchMove;21             TouchMove += TouchableScrollViewer_TouchMove;22 23             //获取ScrollViewer滚动条当前位置24             _startVerticalOffset = VerticalOffset;25             _startHorizontalOffset = HorizontalOffset;26 27             //获取相对于ScrollViewer的触摸点位置28             TouchPoint point = e.GetTouchPoint(this);29             _startPosition = point.Position;30         }31 32         private void TouchableScrollViewer_TouchUp(object sender, TouchEventArgs e)33         {34             //注销触摸移动监听35             TouchMove -= TouchableScrollViewer_TouchMove;36         }37 38         private void TouchableScrollViewer_TouchMove(object sender, TouchEventArgs e)39         {40             //获取相对于ScrollViewer的触摸点位置41             TouchPoint endPoint = e.GetTouchPoint(this);42             //计算相对位置43             double diffOffsetY = endPoint.Position.Y - _startPosition.Y;44             double diffOffsetX = endPoint.Position.X - _startPosition.X;45 46             //ScrollViewer滚动到指定位置(指定位置=起始位置-移动的偏移量，滚动方向和手势方向相反)47             ScrollToVerticalOffset(_startVerticalOffset - diffOffsetY);48             ScrollToHorizontalOffset(_startHorizontalOffset - diffOffsetX);49         }50     }