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From: Simon Wright <simon@pushface.org>
Newsgroups: comp.lang.ada
Subject: Re: Inconsistency in gtkada (Override_Color)
Date: Sun, 22 Jan 2017 12:32:33 +0000
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Date: 2017-01-22T12:32:33+00:00
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hreba <f_hreba@yahoo.com.br> writes:

> I found an inconsistency in Gtkada 2015.
>
> A procedure specification there is
>
>    procedure Override_Color
>       (Widget : not null access Gtk_Widget_Record;
>        State  : Gtk.Enums.Gtk_State_Flags;
>        Color  : Gdk.RGBA.Gdk_RGBA);
>
> The last comment line reads:
> "Since: gtk+ 3.0 "state": the state for which to set the color
> "color": the color to assign, or null to undo the effect of previous
> calls to Gtk.Widget.Override_Color".
>
> This is a copy from GTK where the color parameter is indeed a pointer,
> and not a record as Gdk.RGBA.Gdk_RGBA. Several other
> override-procedures show the same inconsistency between specification
> and description.
>
> Any workaround for resetting the color?

The same inconsistency is present in the Github version[1]. I suppose an
issue should be raised.

Looks to me as though you are supposed to use Gdk.RGBA.Null_RGBA (which
gets translated internally into the needed null).

There are also White_RGBA, Black_RGBA.

[1] https://github.com/AdaCore/gtkada