Map. Mvp. Design patterns and GWT. We have a calculator EntryPoint implementation that places a CalculatorWidget on the RootPanel, so we now need to provide this widget.
This will be our own widget, composed of basic GWT components. CalculatorWidget will contain the view for our calculator application, a simple data and logic layer as the model, and an intermediary controller between these layers. Developer's Guide - Layout Using Panels - Google Web Toolkit - Google Code. Panels in GWT are much like their layout counterparts in other user interface libraries.
The main difference is that GWT panels use HTML elements to lay out their child widgets. Panels contain widgets and other panels. They are used to define the layout of the user interface in the browser. Web Toolkit - Google Code.