utils.py 文件源码

def init_sc_css_provider(toplevel, settings, screen, datadir):
    context = toplevel.get_style_context()
    theme_name = settings.get_property("gtk-theme-name").lower()

    if hasattr(toplevel, '_css_provider'):
        # check old provider, see if we can skip setting or remove old
        # style provider
        if toplevel._css_provider._theme_name == theme_name:
            return
        else:  # clean up old css provider if exixts
            context.remove_provider_for_screen(screen, toplevel._css_provider)

    # munge css path for theme-name
    css_path = os.path.join(datadir,
                            "ui/gtk3/css/softwarecenter.%s.css" % \
                            theme_name)

    # if no css for theme-name try fallback css
    if not os.path.exists(css_path):
        css_path = os.path.join(datadir, "ui/gtk3/css/softwarecenter.css")

    if not os.path.exists(css_path):
        # check fallback exists as well... if not return None but warn
        # its not the end of the world if there is no fallback, just some
        # styling will be derived from the plain ol' Gtk theme
        msg = ("Could not set software-center CSS provider. File '%s' does "
            "not exist!")
        LOG.warn(msg % css_path)
        return

    # things seem ok, now set the css provider for softwarecenter
    msg = "Softwarecenter style provider for %s Gtk theme: %s"
    LOG.debug(msg % (theme_name, css_path))

    provider = Gtk.CssProvider()
    provider._theme_name = theme_name
    toplevel._css_provider = provider

    provider.load_from_path(css_path)
    context.add_provider_for_screen(screen, provider, 800)
    return css_path