We don't expect out of tree implementations of GtkRoot, and having the
interface structure private to the GTK code allows us to add virtual
functions involving private types.
GtkConstraintSolver is an implementation of the Cassowary constraint
solving algorithm:
http://constraints.cs.washington.edu/cassowary/
The Cassowary method allows to incrementally solve a tableau of linear
equations, in the form of:
x = y × coefficient + constant
with different weights, or strengths, applied to each one.
These equations can be used to describe constraints applied to a layout
of UI elements, which allows layout managers using the Cassowary method
to quickly, and efficiently, lay out widgets in complex relations
between themselves and their parent container.
I've seen a crash when the action muxer gets
disposed during widget destroy, and tries to
disconnect from widget signals too late.
There is no real need to disconnect, since the
only time an action muxer is going away is when
its widget is destroyed, so just don't do it.
I recently turned gtk_widget_activate_action()
into a varargs function. That is more convenient
from C, but we need a non-varargs variant for
bindings. So add the old API back, under the
name gtk_widget_activate_action_variant(),
with a rename-to annotation.
We need to create a muxer eagerly for every
widget that has class actions, since those
are otherwise missed in the action lookup
on the muxer side. But otherwise, there is
no reason to create parent muxers aggressively,
as long as we update the parent muxers on
root/unroot.
This reduces the number of muxers we create
in widget-factory from 210 to around 50.
Previously, we would not look any further for
an action once we found a match for the prefix,
defining inheritance by groups. Change this to
inheritance for individual actions, since we
are moving towards individual actions as the
main ingredient in GTKs action support.
The only cases of stateful actions we've seen
so far have been boolean properties, and we
don't really want to add much state handling
API, so lets just go with property actions
for now.
Adapt the only user in GtkText.
along with a new 'type-format' setting that allows
to choose the output format for the "Type" column.
The options implemented for this setting are:
'mime' : Output from g_content_type_get_mime_type().
'description' : Output from g_content_type_get_description().
'category' : It uses the corresponding generic icon
of the mime type to group by categories (aka basic types).
This produces a more compact output than previous options,
and allows for type families to be grouped together, so eg.
after sorting by "Type" column, jpeg and png images will
be placed together, or the various types of archiver files
will also be grouped together.
This format was copied from and currently used by Nautilus
list view, so we also improve consistency with Nautilus.
Bugzilla entry for Nautilus implementation is:
https://bugzilla.gnome.org/show_bug.cgi?id=683722
The list of type families or categories can be checked on:
https://developer.gnome.org/icon-naming-spec/#mimetypes
This 'category' format is set as default.
Issue #362
Some users expect that the Overlay will automatically request enough
size for its overlay children as well as its main child. It doesn't,
because it's just a GtkBin. Add a short paragraph pointing that out.
Close https://gitlab.gnome.org/GNOME/gtk/issues/1939
The only glancing mention of this we had was that GtkButton mentioned it
in passing when discussing how `button` could get contextual classes,
and even that's not relevant in master anymore... so drop it from there.
