wpf - How to get the X,Y position of a UserControl within a Canvas -


i have simple usercontrol below - place in canvas. move using multi-touch , want able read new x,y postion using procedural c# code. ideally have x , y 2 properties or point (x,y).

<usercontrol x:class="touchcontrollibrary.mycontrol"              xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"              xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"              xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"               xmlns:d="http://schemas.microsoft.com/expression/blend/2008"               mc:ignorable="d"               d:designheight="64" d:designwidth="104">     <border name="controlborder" borderthickness="1" borderbrush="black">         <dockpanel margin="1" height="60 " width="100">             <stackpanel  dockpanel.dock="left" background="gray"  width="20" >                 <button background="#ffdede53" padding="0">in</button>             </stackpanel>             <stackpanel  dockpanel.dock="right" background="gray"  width="20" >                 <button background="#ffe8b48f" padding="0">out</button>             </stackpanel>         </dockpanel>       </border> </usercontrol>

i expected create attached property each of 'x' , 'y' , fill them canvas.left , canvas.top, using binding or form of attached property or ???. have spent quite time searching solution, find seems 'not quite needed'.

you can use 2 properties in usercontrol, 

    public double top     {                 {             if (double.isnan(canvas.gettop(this)))             {                 return (double)0;             }             return canvas.gettop(this);         }          set         {             canvas.settop(this, value);         }     }

the check "notanumber" not realy necessary, use prevent errors.


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