draggable() : How to modify containment array with onResize ?

draggable() : How to modify containment array with onResize ?

Hello,
I have a big container with 4 div blocs, my container and my div blocs width change when I resize my window. My problem is  to change the containment array when I resize window.

ex : 
how to change myVar when I resize my window.
this script  doesn't work

$( "#DragContent" ).draggable({
      containment:[-(myVar*NbDiv),0,0,0],
});

$( window ).resize(function() {
 myVar=$(window).width();
} 

Thanks for advice.