MATLAB: How to limit the movement of a rectangle

hobject;rectanglemovingeventdata

I use RectangleMovingEvent.
But I want to move the rectangle only vertically.
So I changed the values of PreviousPosition and CurrentPosition, but they are the same.
How do I limit the movement of the rectangle ??
roi = drawrectangle('Position',p ,'Color',[1 0 0]);
addlistener(roi, 'MovingROI', @(a, b)roi_moved(a, b, handles));
function roi_moved(hObject, eventdata, handles)
p = hObject.Position;

Best Answer

maybe this will work:
roi = drawrectangle('Position',p ,'Color',[1 0 0]);
t=0;
while t<1
    pause(0.15);pos=get(roi,'position');
    set(roi,'position',[p(1) pos(2) p(3) p(4)])
    t=t+0.01;
end
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