Specifies whether this can own the input focus.
Widget implementations should set focusable to true in their init function if
they want to receive keyboard input.
Note that having focusable be true is only one of the necessary conditions for being
focusable. A widget must also be sensitive and can-focus and not have an ancestor that is marked as not can-focus in order to receive
input focus.
See [[email protected]_focus] for actually setting the input focus on a widget.
| this |
a `GtkWidget` |
| focusable |
whether or not this can own the input focus |