Hi Jürgen:
Thanks for ⎕GTK.. Mind you I think it should be called ⎕GUI. That way it may 
evolve beyond libgtk.

It’s interesting for me because for years I’ve tried to find an elegant way to 
use the well developed 
Apple Cocoa Document template app to provide a GUI for GNUAPL.. Now that we 
have libapl working I’m at it again. 

Of course I look at doing this with the Cocoa app being the main app and libapl 
as the server.
Whereas I think you view GNUAPL as the main app and the GUI as the server.

From my POV Cocoa provides all the mechanism… file handles, pipes, even sockets 
if need be (Obj-C is still C).
Especially Notifications for asynchronous communication ( to read file buffers 

Just my 02¢…


> On Aug 10, 2018, at 2:46 PM, Blake McBride <blake1...@gmail.com> wrote:
> Hi, and thanks for a great new feature!!
> As you know there has been an evolution in GUI interfaces over the years as 
> follows:
> 1.  Line-by-line  (APL Quad, Quad-quote)
> 2.  Desktop GUI applications (Win32, GTK, etc.)
> 3.  Web apps (HTML, JavaScript, REST)
> What you have added to GNU APL elevates the possibilities with GNU APL to the 
> second level.
> However, even within level 2, there are (sub-)evolutions.  The original Win32 
> GUI stuff depended on a central event loop.  But I think there is a better 
> approach that can be adapted to GNU APL.  This is something I've done in a 
> GUI library that is part of a development system I wrote that is being used 
> commercially (https://github.com/blakemcbride/Dynace 
> <https://github.com/blakemcbride/Dynace>).  What I propose is as follows:
> 1. eliminate the APL-side event loop entirely
> 2. create the ability to associate APL functions to events on the GTK side 
> (callbacks).  These APL functions would have a standard set of arguments and 
> return but would do the application work.
> I know it can be done because I did it and it is being used by many 
> developers every day for very real applications.  I also think this is a far 
> simpler and manageable way of doing it.
> Just by 2-cents.
> Thanks.
> Blake McBride
> On Fri, Aug 10, 2018 at 12:32 PM Juergen Sauermann 
> <juergen.sauerm...@t-online.de <mailto:juergen.sauerm...@t-online.de>> wrote:
> Hi,
> I have added a new system function ⎕GTK to GNU APL.
> ⎕GTK is based on libgtk+ version 3 and provides a simple (and
> therefore somewhat restricted) way of creating and  managing GUIs
> from an APL program.
> Think of it as a replacement for ⎕ and ⍞ as to create more intuitive
> user interfaces to APL programs.
> ⎕GTK is described in HOWTOs/Quad-GTK.html.
> Enjoy,
> /// Jürgen

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