Dear camlers,<br><br>I&#39;m looking for advanced examples of GUI programming in functional style. As I&#39;m aware there is no definitive answer on this topic, I&#39;ll gladly read about pragmatic approaches which may fail to be fully declarative, but do work well in practice. Lately I&#39;ve been trying to write a little GUI API, replacing all mutable values by React signals (<a href="http://erratique.ch/software/react">http://erratique.ch/software/react</a>), but it turns out to be more difficult than expected, for example with layout management. In order to compute a layout for the widgets, some information has to travel bottom up the widget hierarchy, and some goes top down. While there is a well-founded order for defining all signals, it&#39;s more difficult to group them in their respective widget and still avoid mutually recursive definitions. More generally I&#39;d interested in good (and pragmatic !) techniques for GUI programming, with some real life code. <br>

Cheers,<br>  Philippe.<br><br>