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From: Lucretia <lucretia9@lycos.co.uk>
Newsgroups: comp.lang.ada
Subject: Re: New Ada portable GUI Library?
Date: Sun, 13 Jan 2008 01:11:04 -0800 (PST)
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On Jan 13, 8:13 am, "Dmitry A. Kazakov" <mail...@dmitry-kazakov.de>
wrote:
> Gtk and Qt are themselves thick bindings. It makes no sense to use them as
> a low-level rendering platform. An all-Ada GUI design should IMO look like:

Yes, actually it does. Look at wxWidgets, they use Gtk as a base for
Linux apps to provide a native look and feel. Not many people use
direct X11 libraries for their DE.

> Ada GUI library
> ----------------------------------------
> Ada rendering platform abstraction layer
>            |
>    Ada   | Ada native bindings, engine-specific
> -------- | -----------------------------
>    X11   | Win32 GUI API
>
> The major problem is a good abstraction layer with a working concept of
> inter-tasking signal handler composition. This is a weakness of most known
> Ada GUI libraries.

No! At this level you don't need (or want) to implement tasking.
That's the whole point of using a tiny C veneer as an abstraction for
the stuff you might not be able to do with Ada easily (I'm talking
about managing the C preprocessed code here). You implement the
tasking at the higher Ada layer.

Luke.