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
The reason for this is simply that I want to get hash functions that
have their values close together, so they can fit in a smaller range
(the goal here is 12 bits). By using GQuark, we get consecutive numbers
starting with 1 (and applications have <1000 quarks usually), whereas
interned strings can be all over the place.
As a side effect we also save 64 bytes per declaration.
set_active() is meant to set the state of the property, which happens
during setup.
The clicked signal is emitting events from user actions.
It is impossible to use Togglebuttons for MVC applications as long as it
does that.
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.
This was already mostly done by inheritance from GtkCheckButton.
To complete it, stop using the draw_indicator vfunc for radio
buttons, and instead make the indicator gadget draw either a
check or radio.
Convert GtkToggleButton and its subclasses to CSS nodes.
Keep the button element name for when we want to render
these button-like (but with .toggle, .check and .radio
style classes for differentiation).
When we want to render them with an indicator, use distinct
element names checkbutton and radiobutton, and add a subnode
for the indicator with name check or radio.
GtkRadioButton had a deficient copy of the focus sort code
in GtkContainer, causing focus to jump over the next button
in the list. Just use _gtk_container_focus_sort() here,
which fixes the bug _and_ saves 80 lines of code.
https://bugzilla.gnome.org/show_bug.cgi?id=746817
When a GtkRadioButton has no focus, it will accept it when there is no
other active button in its group.
If the active button in the group is hidden, for example because the UI
desires not to have a default option pre-selected, currently the focus
will not be accepted, which is not desired behavior.
This commit changes the code to only consider visible buttons in the
group when checking whether another button is active.
https://bugzilla.gnome.org/show_bug.cgi?id=739474
It turns out that GtkBuilder will sometimes set a property
twice. Normally, this is harmless, but for GtkRadioButton:group,
it triggered a critical. Remove that.
All buttons should always be marked as :active when they are pressed.
That includes checkboxes (which are never activated in real code anyway,
so this change pretty much doesn't matter).
on:
- GtkToggleButton
- GtkCheckButton
- GtkRadioButton
- GtkModelButton
- GtkCellRendererToggle
- GtkCheckMenuItem
also update themes:
- Adwaita
- Raleigh
but not the win32 theme.
The new :checked state replaces :active for the actual checkedness of
the widgets and :active is now used exclusively while the button is being
pressed.
https://bugzilla.gnome.org/show_bug.cgi?id=733967
