From mboxrd@z Thu Jan  1 00:00:00 1970
X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on
	ip-172-31-74-118.ec2.internal
X-Spam-Level: 
X-Spam-Status: No, score=-1.9 required=3.0 tests=BAYES_00 autolearn=ham
	autolearn_force=no version=3.4.6
Path: eternal-september.org!reader02.eternal-september.org!aioe.org!v8j8diosp9R6yoS0SZP34g.user.46.165.242.91.POSTED!not-for-mail
From: "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>
Newsgroups: comp.lang.ada
Subject: Re: Gtk.Image.Gtk_Image
Date: Sun, 27 Mar 2022 11:33:14 +0200
Organization: Aioe.org NNTP Server
Message-ID: <t1pb0r$elh$1@gioia.aioe.org>
References: <fantome.forums.tDeContes-0254C7.13550424032022@news.free.fr>
 <t1hs30$s7j$1@gioia.aioe.org>
 <fantome.forums.tDeContes-D0BF68.16141524032022@news.free.fr>
 <t1i3qd$oud$1@gioia.aioe.org>
 <fantome.forums.tDeContes-F968A4.19403924032022@news.free.fr>
 <t1ikj3$18ak$1@gioia.aioe.org>
 <fantome.forums.tDeContes-0CD0D9.02525725032022@news.free.fr>
 <t1jr00$1ja4$1@gioia.aioe.org>
 <fantome.forums.tDeContes-AEFBD7.20375225032022@news.free.fr>
 <t1l90i$1otm$1@gioia.aioe.org>
 <fantome.forums.tDeContes-CACBF6.02380226032022@news.free.fr>
 <t1mkkt$1vs3$1@gioia.aioe.org>
 <fantome.forums.tDeContes-8D94B1.18324926032022@news.free.fr>
Mime-Version: 1.0
Content-Type: text/plain; charset=UTF-8; format=flowed
Content-Transfer-Encoding: 7bit
Injection-Info: gioia.aioe.org; logging-data="15025"; posting-host="v8j8diosp9R6yoS0SZP34g.user.gioia.aioe.org"; mail-complaints-to="abuse@aioe.org";
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101
 Thunderbird/91.7.0
X-Notice: Filtered by postfilter v. 0.9.2
Content-Language: en-US
Xref: reader02.eternal-september.org comp.lang.ada:63663
List-Id: <comp.lang.ada>

On 2022-03-26 18:32, Thomas wrote:
> In article <t1mkkt$1vs3$1@gioia.aioe.org>,
>   "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de> wrote:
> 
> since it can be made before call to Gtk.Container.Add, that raises a new
> question:
> 
> should i prefer to call Gtk.Image.Show as soon as possible, when
> creating mcc.tki.Image.External_Image?
> or should i call Gtk.Image.Show only at the time it is really displayed,
> when creating mcc.tki.Widget.Picture.Picture?

I usually create new widgets derived from a container, more or less 
always. GtkAda allows this nicely. Then in my implementation of 
Initialize for the custom I call Show at its end. I never had issues 
with this approach.

>> So it tries to manage the layout
>> by itself instead of using the prescribed techniques. Then Gtk_Fixed is
>> a way to go.
> 
> it asks the user to choose the position and size of each widget, instead
> of ask him to make stacks with automatic layout management, like Gtk
> does with Gtk_Box.

Yes, using GTK in a totally non-GTK way. I had this problem designing my 
GTK/Cairo-based library for instruments like meters, gauges etc. I used 
relative positions and sizes instead of fixed ones to support resizing 
the top-level dashboard widgets. Plus hacks for keeping or not keeping 
aspect ratio of the resized thing. The base is Gtk_Drawing_Area_Record 
rather than Gtk_Fixed_Record.

-- 
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de