Re: [orca-list] Geany, SciTE and other Scintilla based applications

[Mike Gorse <mgorse alum wpi edu>]

Also, if you haven't worked with gtk before, then I'd suggest reading a 
bit about GObjects, since they are used by gtk and atk, and it should be 
helpful for some other things to make sense. There's a wikipedia page 
here:

http://en.wikipedia.org/wiki/GObject

as well as documentation on developer.gnome.org.

On Tue, 15 Jul 2014, Mike Gorse wrote:

> Hi Mike,
>
> Unfortunately, we don't really have a good tutorial for building custom atk 
> classes (I thought there was one around somewhere, but now I can't find it, 
> and it would be outdated anyhow). My suggestion would be to look through 
> gtk's accessibility code (in gtk/a11y for gtk 3) and look at the atk 
> documentation as a reference:
>
> https://developer.gnome.org/atk/unstable/
>
> For the stable gtk+ sources: ftp://ftp.gnome.org/pub/gnome/sources/gtk+/3.12
>
> If you only need to support gtk 3.8 or later, then you can derive your 
> classes from the relevant Gtk*Accessible classes and call 
> gtk_widget_class_set_accessible_type in the custom widget's class init 
> function. If you also need to support earlier versions of gtk, then it is a 
> bit of a mess, and your best bet is probably to override get_accessible in 
> the class init function and create a base class adapted from, say, 
> GtkWidgetAccessible. For an example of how to do this, you could look at my 
> patch on https://bugzilla.gnome.org/show_bug.cgi?id=669441 (the patch in 
> comment 7, not the much cleaner patch in comment 4, but the latter is a good 
> example if you only need to support gtk+ 3.8 and later). One option might be 
> to encapsulate the accessibility code with #if GTK_CHECK_VERSION(3.8.0), 
> depending on whether it's important to make it work for gtk 2 as well.
>
> Feel free to write if you have other questions. Sorry for not being able to 
> suggest anything more straight-forward in terms of documentation, but, 
> anyway, it would be good for more people to understand how all of this works.
>
> Thanks,
> -Mike
>
> On Tue, 15 Jul 2014, Mike Ray wrote:
>
> > He also said that if I add atk accessibility to it he will incorporate
> > the changes.
> >
> > But as I don't currently know how to do this, it is likely to take me a
> > while.
> >
> > If anybody can point me at atk tutorials and tips I'd like to have a go
> > as I am a big fan of SciTE on Windows.
> >
> > Mike
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