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
Shift-Tabbing was getting stuck in GtkSearchEntry and
GtkPasswordEntry, since they grab the focus to a child
of theirs. Copy the same fix that we are already using
in GtkEntry.
Fixes: #2842
Just measuring it (so the warning goes away) but then not using the
values will later underallocate the text widget.
Instead, always reserve space for the icon (which will inevitable be
visible as soon as the searchentry is actually being used).
Fixes#1831
Users of search entries usually handled visibility (when initially hidden)
by checking the return value of gtk_search_entry_handle_event(). This does
not pan out with gtk_search_entry_set_key_capture_widget() since the return
value is not directly seen by the caller.
Add a ::search-started signal to cater for it, which gets emitted when the
search entry went from empty to non-empty.
Use the same sizing approach we use for GtkEntry:
ignore icons when measuring. This ensures that
search entries don't change size as icons come
and go.
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.
