Re: [orca-list] technical question about gtk labels

[Peter Vágner <pvdeejay gmail com>]

Hello,
This is most simple fix developers can do to their apps and it really 
gives back more awesome experience. It is really easy.
Another thing I would be happy to learn my-self is how to properly 
implement popup menu trigger. I am not sure how to call this so I'll 
rather describe so you can point me to where I can read on this. When 
browsing the list of files in nautilus I can select a file or a group of 
files by holding ctrl key and pressing space on each item I wish to 
select. When items are selected like this I can press the menu key also 
known as the applications key on the keyboard which is usually 
positioned to the right of a spacebar key. Pressing this menu key will 
popup a menu and corresponding actions related to the selection are 
displayed in that popup menu.
In apps such as file roller, brasero and maybe some others there is also 
a popup menu implemented however the menu key can't be used to spawn it. 
In file roller and brasero we do have to emulate right mouse click on 
the selection. Is there a standard technique for doing this?


Greetings

Peter

On 28.05.2015 at 02:01 Joanmarie Diggs wrote:
> Hey Kendell.
>
> gtk_label_new() creates a new GtkLabel. That does not in any way connect
> the label to the widget. What app developers sometimes do is just
> position the label next to the widget. Sighted users then conclude the
> former describes the latter. But there's no actual connection.
>
> In terms of making an actual and accessible connection between a label
> and a widget, the app developer needs to create a label-for/labelled-by
> AtkRelation pair between the label and the widget it labels. Many times
> Gtk+ app developers get this AtkRelation pair for free -- and possibly
> without even knowing it -- because the app developer chooses to set the
> mnemonic-widget property. Setting that property makes things like Alt+R
> give focus to the Resolution combo box. It also causes Gtk+ to do the
> ATK work. In the example you provide, in which there is no underlined
> letter, it would be a hack to set the mnemonic-widget property. Some
> developers are happy to do the hack because it's easy. Some developers
> will frown at the hack because it's sad. The frowners can call
> atk_object_add_relationship(). It's also easy. Docs are here:
> https://developer.gnome.org/atk/unstable/AtkObject.html#atk-object-add-relationship.
>
> Lastly, if you look at the bottom of this fix I did for Evince, you'll
> see an example of using atk_object_add_relationship() to set the pair.
> (Along with a detailed commit message explaining why this stuff needs
> doing.) https://git.gnome.org/browse/evince/commit/?id=a6cdc12b66a
>
> Hope this helps!
> --joanie
>
>
> On 05/27/2015 07:11 PM, kendell clark wrote:
> > hi all
> > This isn't a bug report, or anything like that, but a question. There
> > are still quite a few things in gnome control center and in gnome
> > itself which aren't labeled properly, causing orca to simply announce
> > only the role of the object "button" "combo box" etc, instead of it's
> > label, followed by the role. I cloned the gnome control center's git
> > repository and checked out the gnome 3.16 branch to make sure I was
> > using the latest code for gnome 3.16, and looked through some of the
> > code. I'm no expert in c code, I barely know enough to have a basic
> > understanding of what I'm reading, but looking at most of it, orca
> > should announce most things. Here's a fragment taken from the display
> > panel in gnome control center.  cc-display-panel.c.
> >    label  gtk_label_new (_("Resolution"));
> >    gtk_style_context_add_class (gtk_widget_get_style_context (label),
> >                                 GTK_STYLE_CLASS_DIM_LABEL);
> >
> > There are more lines but I tried to paste the most relevant. Looking
> > at that code,  it looks like orca should announce "resolution combo
> > box xxxx times yyyy ratio" instead of "combo box xxxx times yyyy
> > ratio". Any c or c++ experts around who can answer this one? This
> > looks like it's labeled properly, and yet orca doesn't see the label.
> > Thanks a lot for any help, I'm trying to iron out the remaining a11y
> > bugs in gnome. Plus, I'm getting tired of unlabeled controls that linger
> > Thanks
> > Kendell clark
> > _______________________________________________
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> The FAQ is at http://live.gnome.org/Orca/FrequentlyAskedQuestions
> Log bugs and feature requests at http://bugzilla.gnome.org
> Find out how to help at http://live.gnome.org/Orca/HowCanIHelp