mirror of
https://github.com/brl/mutter.git
synced 2024-11-11 08:46:26 -05:00
75 lines
3.1 KiB
XML
75 lines
3.1 KiB
XML
|
<part id="clutter-overview">
|
||
|
|
<partinfo>
|
||
|
|
<author>
|
||
|
|
<firstname>Alejandro</firstname>
|
||
|
|
<surname>Piñeiro Iglesias</surname>
|
||
|
|
<affiliation>
|
||
|
|
<address>
|
||
|
|
<email>apinheiro@igalia.com</email>
|
||
|
|
</address>
|
||
|
|
</affiliation>
|
||
|
|
</author>
|
||
|
|
</partinfo>
|
||
|
|
|
||
|
|
<title>Overview</title>
|
||
|
|
|
||
|
|
<partintro>
|
||
|
|
|
||
|
|
<para>Cally (Clutter Accessibility Implementation Library) is the
|
||
|
|
Clutter implementation of the ATK interfaces. You can see as the
|
||
|
|
Clutter equivalent of GAIL, which provides accessibility support
|
||
|
|
for GTK+ and other GNOME related libraries.</para>
|
||
|
|
|
||
|
|
<para>This implementation expose Clutter actors to accessibility
|
||
|
|
tools like Orca. This allows not only writing accessible user
|
||
|
|
interfaces, but also allows testing and verification frameworks
|
||
|
|
based on accessibility technologies to inspect and test a Clutter
|
||
|
|
scene graph.</para>
|
||
|
|
|
||
|
|
<para>This reference manual defines the different APIs defined in
|
||
|
|
Cally. Anyway take into account that the most common use of case
|
||
|
|
Cally is transparent to the user, as the different accessibility
|
||
|
|
tools are intended to use the abstract ATK interfaces, and *not
|
||
|
|
directly* Cally, so this tools can communicate with applications
|
||
|
|
using different toolkits, like GTK+, Java, Clutter, etc. </para>
|
||
|
|
|
||
|
|
<para>The purpose of this reference is allow to extend Cally
|
||
|
|
functionality in any Clutter-based widget toolkit. Clutter is more
|
||
|
|
low-level that other toolkits like GTK+, and some toolkits have
|
||
|
|
started to appear based on Clutter: MX, Shell Toolkit, Candies,
|
||
|
|
Glitter, etc. This means that it is really likely that these
|
||
|
|
libraries will require extra accessibility support.</para>
|
||
|
|
|
||
|
|
<para>GAIL used a different approach, being a almost-pure-opaque
|
||
|
|
implementation of the ATK interfaces. So you can't extend it
|
||
|
|
directly. You need to use GObject and ATK mechanisms, like
|
||
|
|
run-time anonymous inheritance, to extend it. Although valid to
|
||
|
|
some custom cases, it showed to be really problematic and hacky in
|
||
|
|
wider approaches, like HAIL(Hildon Accessibility Implementation
|
||
|
|
Library). As explained, Clutter is more likely to be extended, so
|
||
|
|
these issues would arise sooner.</para>
|
||
|
|
|
||
|
|
<para>Part of the accessibility support is implemented on Clutter,
|
||
|
|
like the initialization code, and the method to obtain the
|
||
|
|
accessibility object for each Clutter object. In the same way, to
|
||
|
|
make it easier, and to allow access to Clutter object private
|
||
|
|
data, it would be really likely that the accessibility support
|
||
|
|
would be implemented directly on some Clutter objects</para>
|
||
|
|
|
||
|
|
<para>Check the next clutter methods for more information:</para>
|
||
|
|
<variablelist>
|
||
|
|
<varlistentry>
|
||
|
|
<term>clutter_actor_get_accessible()</term>
|
||
|
|
<listitem>Virtual method to obtain the accessibility object of a
|
||
|
|
clutter actor</listitem>
|
||
|
|
</varlistentry>
|
||
|
|
<varlistentry>
|
||
|
|
<term>clutter_get_accessibility_enabled()</term>
|
||
|
|
<listitem>Method to check if accessibility is enabled.</listitem>
|
||
|
|
</varlistentry>
|
||
|
|
</variablelist>
|
||
|
|
|
||
|
|
</partintro>
|
||
|
|
|
||
|
|
</part>
|