GtkToggleButton::set_mode
void set_mode(bool draw_indicator);
set_mode() is used
internally to set the indicator mode for the different varieties of
toggle button. There is no reason to use it unless you are creating
your own widget.
This method toggles whether the toggle indicator is drawn or not. In
GtkToggleButton itself, the indicator happens
to take up the entire surface of the button, so that if the
draw_indicator parameter is set to
true the button itself vanishes. In the classes
that inherit the GtkToggleButton methods
the indicator takes up a very small area of the button, and setting
the mode as false in those classes removes the
indicator from the button, leaving only a
GtkToggleButton with an offset label.
