Some widgets have different accessible roles depending on some
parameter, so we cannot set the role at class init time. For those
widgets, we add an "accessible-role" property to GtkAccessible, and we
allow setting it (only) at construction time.
An Accessible implementation must create an ATContext object. UI
elements are supposed to interact with the GtkAccessible API, but we
expose GtkATContext to allow patterns like delegation.
GtkAccessible is an interface for accessible UI elements.
Currently, it doesn't do much except exist as a type; in the future, it
will be the entry point for all accessible state in GTK.
To build a better world sometimes means having to tear the old one down.
-- Alexander Pierce, "Captain America: The Winter Soldier"
ATK served us well for nearly 20 years, but the world has changed, and
GTK has changed with it. Now ATK is mostly a hindrance towards improving
the accessibility stack:
- it maps to a very specific implementation, AT-SPI, which is Linux and
Unix specific
- it requires implementing the same functionality in three different
layers of the stack: AT-SPI, ATK, and GTK
- only GTK uses it; every other Linux and Unix toolkit and application
talks to AT-SPI directly, including assistive technologies
Sadly, we cannot incrementally port GTK to a new accessibility stack;
since ATK insulates us entirely from the underlying implementation, we
cannot replace it piecemeal. Instead, we're going to remove everything
and then incrementally build on a clean slate:
- add an "accessible" interface, implemented by GTK objects directly,
which describe the accessible role and state changes for every UI
element
- add an "assistive technology context" to proxy a native accessibility
API, and assign it to every widget
- implement the AT context depending on the platform
For more information, see: https://gitlab.gnome.org/GNOME/gtk/-/issues/2833
Remove all the old 2.x and 3.x version annotations.
GTK+ 4 is a new start, and from the perspective of a
GTK+ 4 developer all these APIs have been around since
the beginning.
Unsetting the widget causes events to get emitted and we want to
(a) really emit that event to our signal handlers
(b) still be recognized as a real GObject while doing that
https://bugzilla.gnome.org/show_bug.cgi?id=669794
I expect them to be used a lot, so this approach seems better than
requiring signals that connect to "notify::widget". Also, we can't use
regular functions (like dispose or constructed), becaiuse those assume
that (un)setting of the widget only happens once and with the current
design (a puble set_widget() function) we can't really guarantee that.
Also, I split them into two separate functions as one function is part
of construction and the other part of destruction of the object. And it
doesn't sound like a good idea to have that both be part of one
function.
I wanted to use weak refs to ensure this instead, but it's a performance
problem when used in the treeview and each and every cell adds a weak
ref to the treeview.
2008-06-30 Cody Russell <bratsche@gnome.org>
* Practically everything changed.
Change all references of GIMP Toolkit (and variations of it)
to GTK+ Toolkit, showing no mercy at all to our beloved
ancestry. (#540529)
svn path=/trunk/; revision=20709
2005-09-01 Matthias Clasen <mclasen@redhat.com>
* gdk/*.c: Intern some more strings.
* gtk/gtkintl.h:
* gtk/*.c: Define an I_() macro and use it instead of the
bulky g_intern_static_string().
2005-08-31 Matthias Clasen <mclasen@redhat.com>
* gdk/Makefile.am:
* gtk/Makefile.am: Intern type names in code generated by
glib-mkenums, too.
* gtk/*.c:
* gdk/x11/*.c:
* gdk/*.c: Intern type names before registering the type to avoid
unnecessary copies.
2005-03-20 Matthias Clasen <mclasen@redhat.com>
Make PLT-reduction work with gcc4, and don't include
everything in gdkalias.h:
* gtk/grk.symbols: Group symbols by header and source file.
* gtk/makegtkalias.pl: Protect definitions by the same
preprocessor symbols used to guard the headers. Move
the alias declarations to a separate file which is
produced when calling makegtkalias.pl -def
* gdk/Makefile.am (gtkaliasdef.c): Add a rule to generate
this file.
* gtk/*.c: Include gtkalias.h after the other headers,
include gtkaliasdef.c at the bottom.
* gtk/*.h: Small cleanups.
Mon Aug 9 12:48:04 2004 Matthias Clasen <maclas@gmx.de>
Add hidden aliases for exported symbols which are
used internally in order to get rid of many PLT
entries. (#145519, Arjan van de Ven)
* gtk/Makefile.am: Add rules to generate gtk.def and
from gtk.symbols, and make make check check the abi
with abicheck.sh.
(gtk_private_h_sources): Add gtkinternals.h
(gtk_built_private_headers): Add gtkalias.h
(gtk_extra_sources): Add gtk.symbols
(EXTRA_DIST): Add makegtkalias.pl and abicheck.sh
* gtk/gtk.symbols: New file. Definition of the GTK+ ABI.
The file can be processed by cpp to filter out certain
subsets of symbols.
* gtk/abicheck.sh: New file. Script to check the actually
symbols exported from libgtk-x11.2.0.so against the symbols
found in gtk.symbols.
* gtk/makegtkalias.pl: New file. Perl script to generate the
header containing the alias definitions for internally used
exported symbols from a list of symbols.
* gtk/gtkinternals.h: New file. An uninstalled header listing
symbols which must be exported for some reason and do not appear
in any other header.
* gtk/*.c: Include gtkalias.h
2004-03-05 Federico Mena Quintero <federico@ximian.com>
Fixes#136082 and #135265, patch by Morten Welinder.
* configure.in: Use AC_SYS_LARGEFILE.
* */*.c: #include <config.h>
Wed Jul 18 19:28:46 2001 Owen Taylor <otaylor@redhat.com>
* gtk/*.c: Patch from Matthias Clasen to remove remove
all instances of g_return_if_fail (foo != NULL); that are
immediately before a g_return_if_fail (GTK_IS_FOO (foo));
since the second check catches the NULL anyways.
Thu May 3 14:13:49 2001 Owen Taylor <otaylor@redhat.com>
* INSTALL.in HACKING gtk/gtkaccessible.[ch] gtk/gtk.c: Add
dependency on Atk for accessibility support.
* configure.in **/Makefile.am: Major reworking of substituted
variables for CFLAGS/LIBS to make a lot more sane and
keep the the compile/link lines a bit shorter.
* gdk/x11/gdkkeys-x11.c: Fix #endif with trailing stuff.
