What's the difference between TabPanel and TabLayoutPanel in GWT

Question

What's the difference between TabPanel and TabLayoutPanel in GWT? I can't find the answer in Google and it is difficult to understand reading docs

Answer 1

TabLayoutPanel is a layout panel: it's sized from the outside-in, it has to be given explicit dimensions and be notified when they changed (RequiresResize), and similarly will resize its children and notify them when it does so (ProvidesResize).

TabPanel is not; it's sized from the inside-out: it'll resize itself depending on the size of the widget in the selected tab.