Currently, only if PangoFT2 is present and used it is supported
to retrieve the languages that are supported by a particular font.
If we don't have PangoFT2, remove the language filtering and the
sample text selection.
Based on earlier work by Chun-wei Fan, see
https://gitlab.gnome.org/GNOME/gtk/-/merge_requests/2614
The centered layout of the font previews don't look appealing
and make it harder to judge the relative width and weight of
the individual styles.
Fixes: #3188
The port is kind of evil, in that it stores either a PangoFontFamily or a
PangoFontFace in the list, depending on if the fontchooser is configured
to select fonts or faces.
It also does not cache the font description anymore, so more calls to
pango_font_describe() may happen.
If both of these issues turn out problematic, the fontchooser would need
to resurrect GtkDelayedFontDescription again and put objects of that
type through the model.
These changes depend on Pango 1.46's introduction of listmodels and
various new getters, so the dependency has been upgraded.
1. Rename the thing
2. Turn it from a signal to a vfunc
3. Pass the GtkCssStyleChange to it
We don't export any public API about the GtkCssStyleChange yet, it's
just a boring opaque struct.
This is meant as an input to the font chooser.
We don't want the user to select a language, but
rather have fonts presented as they would work for
the current language. Therefore, do away with the
lang/script combo on the tweak page.
Add a button the dialog's header bar that lets us
switch to a second page where we can customize
the selected font.
Make the font chooser widget export an action that the
dialog can use for the button. This has some advantages:
- we can export not just the toggle state, but also enabled
- we can reuse the same enabled state to make the select
button insensitive when no font is selected
To determine whether a font is selected, listen to changes
of the list selection. And ensure that the font chooser is
in an initial state when mapped, even if we close the dialog
from the tweak page.
Previously, we would pango_font_describe() every time the code ran and
we wouldn't ever hit the optimized quick exit.
The code now is a lot more complex because the
compute-actual-value-when-required-the-first-time approach is not
supported out of the box in GtkTreeModel (or GValue).
This subdirectory gets in the way when integrating the inspector
build more fully with GTK+, and does not really add anything.
Just move everything one level up.
