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    <p>The distinction between widgets and MVP is not as clear as you might think.<br> You can very well implement widgets using the MVP pattern. </p> <p>An example for this are GWT's own <a href="http://code.google.com/intl/de-DE/webtoolkit/doc/latest/DevGuideUiCellWidgets.html" rel="nofollow">CellWidgets</a>.<br> CellWidgets like <code>CellTable</code>are internally using <a href="http://code.google.com/p/google-web-toolkit/source/search?q=CellTable&amp;origq=CellTable&amp;btnG=Search%20Trunk" rel="nofollow">presenters</a> and views to decouple view from logic/state. This makes it easy to unit test them. </p> <p>I think there is no perfect solution and it probably also depends on the use-case/application. I usually try to avoid making backend calls (RPC or so) from widgets itself. I try to design widgets in a way, that the data they process and ultimately display is set from outside by the presenters.<br> So basically widgets are only view like sub-components which are populated and controlled by the presenter and are embedded in the view. </p> <p>If you want to have more complex widgets which also contain business logic and backend calls then try to apply the MVP pattern to the widget.</p> <p>It also depends on what kind of MVP framework you are using. With Activities and Places (ok, strictly not an MVP framework) you usually don't have nested presenters (see Thomas Broyer <a href="http://tbroyer.posterous.com/gwt-21-activities-nesting-yagni" rel="nofollow">blog</a>).<br> This is different when you use the <a href="http://code.google.com/p/gwt-platform/" rel="nofollow">GWTP</a> MVP framework which has the concept of <a href="http://code.google.com/p/gwt-platform/wiki/GettingStarted?tm=6#Presenter_widgets" rel="nofollow">PresenterWidgets</a> and allows to nest presenters. </p>
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