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From: DrPi <314@drpi.fr>
Subject: Re: GtkAda callback and event
Date: Sat, 11 Sep 2021 17:24:41 +0200
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Le 10/09/2021 à 22:58, Dmitry A. Kazakov a écrit :
> On 2021-09-10 22:42, DrPi wrote:
> 
>> I didn't think I can extend the widget type to add my own parameters.
> 
> Not only for parameters.
> 
> Even more frequent purpose is a composite widget. E.g. consider a text 
> edit widget with a scroll bar, a menu, some buttons etc. Typically, you 
> would take some existing widget and derive your widget from there.
> 
> In the Initialize you will create all other widgets and pack them into 
> the widget (if it is a container) or Ref them otherwise. In Gtk_New you 
> will have custom parameters.
> 
> This new widget you could use just as any built-in widget.

I already do this.
I don't know why I didn't think to apply this to my own parameters.

> 
> Moreover, you can create a new class for your derived widget and add new 
> events, properties and styles for external parametrization etc. The 
> styles can be set via CSS.
Interesting.
Any pointer on how to use CSS styles ?

> 
> It is a very powerful and versatile mechanism GtkAda offers.
> 

Even if I just started using GtkAda, I find it very powerful.
The big problem is documentation. Of course, there are the reference 
manual and the (small) user guide but I miss a document explaining the 
use of all these functionalities.
I found a tutorial in French which is very helpful for starting but it 
is outdated.