GtkShortcutsLabel alternative for use outside of a GtkShortcutsWindow

gistfile1.txt

class ShortcutDisplay(Gtk.Box):
    def __init__(self, accel_string):
        Gtk.Box.__init__(self, Gtk.Orientation.HORIZONTAL, 2)

        def get_label(text, style_class=None):
            label = Gtk.Label(text)
            if style_class is not None:
                label.get_style_context().add_class(style_class)
            return label

        [accel_key, mask] = Gtk.accelerator_parse(accel_string)
        labels = []
        if accel_key == 0 and mask == 0:
            # failed to parse
            labels.append(get_label(accel_string))
        else:
            text = Gtk.accelerator_get_label(accel_key, mask)
            if "+" not in text:
                # shouldn't be reachable?
                labels.append(get_label(text), "keycap")
            else:
                # we make a pointless label and discard it here, but it's the easiest way *shrug*
                for key_name in text.split("+"):
                    labels.append(get_label(key_name, "keycap"))
                    labels.append(get_label("+", "dim-label"))
                labels.pop()
        for label in labels:
            self.pack_start(label, False, False, 0)