For an example, check the third comment (from Mauro) on https://groups.google.com/forum/#!topic/google-web-toolkit/C6S4jS1UsM0/discussion and see if it fits you needs. The sample is beyond simple layouting but you can find the collapsing/resizing logic you are looking for in the AppLayoutImpl class.
-- You received this message because you are subscribed to the Google Groups "Google Web Toolkit" group. To view this discussion on the web visit https://groups.google.com/d/msg/google-web-toolkit/-/s_afvP7vpOsJ. To post to this group, send email to google-web-toolkit@googlegroups.com. To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.