GWT Layout: "take up the rest of the space."

Question

My existing layout is a stack of two divs - g:layers in a LayoutPanel. The top div should be as big as it needs to be to contain its contents. The bottom div should take up the rest of the space on the screen, without causing scrollbars to appear.

The contents of the top div can change, so the size of the top div can change.

My current solution is a callback that's triggered whenever the contents of the top div change. The containing LayoutPanel can then recalculate the size of the top div and explicitly set the top and bottom attributes of the second layer to take up the rest of the space. Is there a better way? Something like,

<g:LayoutPanel>
    <g:layer top="0px" height="whatever you need, baby">
        <c:SomeWidget/>
    </g:layer>
    <g:layer top="the bottom of the first layer" bottom="0px">
        <c:Anotherwidget/>
    </g:layer>
</g:LayoutPanel>

Answer 1

The answer seems to be that there is not a better way. Manual recalculation isn't so bad when you get used to it!