<ctrl:uiPopup x:Name="canvas" VerticalOffset="-410" IsOpen="True" AllowsTransparency="True" PopupAnimation="Fade"><Canvas  Height="410" Width="548"><Image x:Name="PanelLeft" Height="410" Width="45" Canvas.Left="0"></Image><Image x:Name="PanelTop" Height="45" Width="548" Canvas.Top="0"></Image><Image x:Name="PanelRight" Height="410" Width="45" Canvas.Right="0"></Image><Image x:Name="PanelBottom" Height="45" Width="548" Canvas.Bottom="0"></Image><Image x:Name="PanelPlus" Height="100" Width="100" Panel.ZIndex="1"></Image></Canvas>
</ctrl:uiPopup>

//注册移动事件
PanelPlus.MouseLeftButtonDown += rectOne_MouseLeftButtonDown;
PanelPlus.MouseLeftButtonUp += rectOne_MouseLeftButtonUp;
PanelPlus.MouseMove += rectOne_MouseMove;

bool enableMove = false;
double spanLeft = 0;
double spanTop = 0;
//鼠标移动
private void rectOne_MouseMove(object sender, MouseEventArgs e)
{if (enableMove){var cLeft = e.GetPosition(canvas).X - spanLeft;var cTop = e.GetPosition(canvas).Y - spanTop;//设置矩形的位置Canvas.SetLeft(PanelPlus, cLeft);Canvas.SetTop(PanelPlus, cTop);}
}
//鼠标松开
private void rectOne_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)
{//释放鼠标捕获PanelPlus.ReleaseMouseCapture();enableMove = false;
}
//鼠标按下
private void rectOne_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{var y = Convert.ToDouble(e.GetPosition(canvas).Y);y = Utils.IsNumber(y) ? y : 0;var x = Convert.ToDouble(e.GetPosition(canvas).X);x = Utils.IsNumber(x) ? x : 0;//创建鼠标捕获Mouse.Capture(PanelPlus);double l = Convert.ToDouble(Canvas.GetLeft(PanelPlus));l = Utils.IsNumber(l) ? l : 0;double t = Convert.ToDouble(Canvas.GetTop(PanelPlus));t = Utils.IsNumber(t) ? t : 0;spanLeft = x - l;spanTop = y - t;enableMove = true;
}

public class Utils
{//判断字符串是否为纯数字  public static bool IsNumber(object str){if (str == null) return false;ASCIIEncoding ascii = new ASCIIEncoding();byte[] bytestr = ascii.GetBytes(str.ToString());foreach (byte c in bytestr){if (c < 48 || c > 57) {return false;}}return true;}
}