Replace granite.statusbar with gtk.actionbar

[Danielle Foré]

After some discussion with Matthias Clasen, it seems gtk.actionbar might do everything that statusbar was built to do. We should investigate if we can deprecate this widget.

[Victor Martinez (victored)]

In theory it can be done, but gtk.actionbar is a non-themeable container based on Gtk.Box :(

[Danielle Foré (danrabbit)]

Ah crap really? From my discussion with Matthias it sounded like it was themeable.

[Victor Martinez (victored)]

Yes :( It's sadly not themeable like every other container widget (except for Gtk.Toolbar and Gtk.HeaderBar).

It has to be packed into a themeable container in order to get a non-transparent background and border support.

That said, we can add theming support by subclassing the widget, but that would imply providing a Granite version of it. It sounds to me like we could base our current StatusBar upon Gtk.ActionBar, but not deprecate it in favor of the latter.

[Victor Martinez (victored)]

I was wrong.

GtkActionBar is the ideal replacement for GraniteStatusBar, and it's actually themeable!

See the linked branch for an example of how to port any app from Granite.Widgets.StatusBar to Gtk.ActionBar.

There's no reason to not deprecate Granite's StatusBar.