Turns on flag values in the current widget state.
Typical widget states are insensitive, prelighted, etc.
This function accepts the values gtk_state_flag_dir_ltr and gtk_state_flag_dir_rtl but ignores them. If you want to set the widget's direction, use [[email protected]_direction].
This function is for use in widget implementations.
| this |
a `GtkWidget` |
| flags |
State flags to turn on |
| clear |
Whether to clear state before turning on |