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Newsgroups: comp.lang.ada
Date: Tue, 3 Dec 2019 06:44:32 -0800 (PST)
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Subject: Re: wanted: expertise with Gtkada.Canvas_View in gtkada 17.0
From: mario.blunk.gplus@gmail.com
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Xref: reader01.eternal-september.org comp.lang.ada:57634
Date: 2019-12-03T06:44:32-08:00
List-Id: <comp.lang.ada>

On Friday, November 29, 2019 at 1:48:07 PM UTC+1, briot....@gmail.com wrote=
:
> > does anyone here have expertise with the package Gtkada.Canvas_View ?=
=20
>=20
> I wrote it at the time, but I haven't used GtkAda for three years now so
> I am a little rusty on the subject. You could still try sending your actu=
al
> question, maybe other people can help.

I'm still playing with my demo at https://github.com/Blunk-electronic/ada_t=
raining/tree/master/src/gtkada_8 . The requires library units are in
https://github.com/Blunk-electronic/ada_training/tree/master/src/lib .

In the package spec Gtkada.Canvas_View you say that in order to customize t=
he canvas background, the procedure draw_internal should be overridden (lin=
e 53). If I'm correct, this implies extending the type canvas_view_record a=
nd overriding draw_internal of the derived type. This is what I did in my d=
emo in file gtkada-canvas_view-canvas_test.ads . The derived type is type_v=
iew. Right below is the overriding of draw_internal. The actual overriding =
takes place in gtkada-canvas_view-canvas_test.adb .
 Here I'm stuck.  So my first question: Do I need the pointer type_view_ptr=
 that accesses the type_view ?

Thanks