The code used to do
if (parent_class->clicked)
parent_class->clicked (...)
That is pointless because the parent_class never changes,
so there' no need for that if and commit 415946eb0f
took it out. Unfortunately, p arent_class->clicked is NULL
though, so the whole call needs to go.
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
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.
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.
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
GtkCheckButton sets a different initial value for this property without
actually changing the declared default, and then relies on change notification
to update other properties (such as xalign). This, combined with glades
insistance on putting default values into ui files creates a situation
where we can't remove the redundant notification for ::draw-indicator
without causing lots of checkboxes to suddenly have centered labels.
This was seen in gnome-terminal, evolution, and other applications.
Therefore, keep the extra notification for now. This can be revisited
when we clean up the button hierarchy.
Try to do a better job of keeping example content
from being too wide. It is often rendered as <pre>
text so the only time we can wrap it is in the source.
It is best to full break lines at all punctuation and
to try to keep the width under 70 chars or so.
