Now that the QuickSettingsMenu supports child menus, it is time
to add menu support to quick toggles.
Do that by introducing a QuickSettingsItem parent class with a
construct-only :has-menu property, as that will allow including
menus in items that aren't following the standard icon+label
pattern of QuickToggle (yes, we'll have some of those).
A common parent class also allows us to control the type of
menu that is created. That's important, as we need another
custom menu type to
- constrain the menu's y position to place it underneath
the source actor
- use open/close animations taylored for this use case
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2393>
The quick settings menu is a popover that arranges items in a
reflowing, homogeneous grid. Grid children may span multiple
columns, but not rows.
For now the QuickSettingsMenu that contains the grid is just a
convenience wrapper around the layout manager that does the heavy
lifting. The two will become more intertwined when we add support
for menu toggles though, so the custom menu type is unfortunately
needed.
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2392>
