Actually, just noticed..
ResizeLayoutPanel<http://google-web-toolkit.googlecode.com/svn/javadoc/latest/com/google/gwt/user/client/ui/ResizeLayoutPanel.html>
looks
to do exactly what you want. It holds a LayoutPanel inside a regular Panel
and detects re-sizes, to provide onResize() events to it's one child
widget. So
<g:HeaderPanel>
<my:HeaderWidget>
<g:ResizeLayoutPanel>
<g:DockLayoutPanel>
...
Should give you a DockLayoutPanel that changes size dynamically depending
on the content of the header/footer widgets.
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