WPF Image触摸移动方法

   1:  TouchPoint mPoint = null;

   2:  double mOffsetX;//水平滚动条当前位置

   3:  double mOffsetY;//垂直滚动条当前位置

   4:  bool mIsTouch = false;//是否触摸

   5:  //触摸事件

   6:  private void mScrollViewer_TouchDown(object sender, TouchEventArgs e)

   7:  {

   8:      mIsTouch = true;//正在触摸

   9:      mOffsetX = this.mScrollViewer.HorizontalOffset;//获取ScrollViewer滚动条当前位置

  10:      mOffsetY = this.mScrollViewer.VerticalOffset;//获取ScrollViewer滚动条当前位置

  11:      mPoint = e.GetTouchPoint(mScrollViewer);//获取相对于ScrollViewer的触摸点位置

  12:  }

  13:   

  14:  //触摸移动事件

  15:  private void mScrollViewer_TouchMove(object sender, TouchEventArgs e)

  16:  {

  17:      if (mIsTouch == true)//如果正在触摸

  18:      {

  19:          TouchPoint point = e.GetTouchPoint(mScrollViewer);//获取相对于ScrollViewer的触摸点位置

  20:          double DiffOffsetX = point.Position.X - mPoint.Position.X;//计算相对位置

  21:          double DiffOffsetY = point.Position.Y - mPoint.Position.Y;//计算相对位置

  22:          this.mScrollViewer.ScrollToHorizontalOffset(mOffsetX - DiffOffsetX);//ScrollViewer滚动到指定位置

  23:          this.mScrollViewer.ScrollToVerticalOffset(mOffsetY - DiffOffsetY);//ScrollViewer滚动到指定位置

  24:      }

  25:  }

  26:   

  27:  //触摸结束事件

  28:  private void mScrollViewer_TouchUp(object sender, TouchEventArgs e)

  29:  {

  30:      mIsTouch = false;//触摸结束

  31:  }