gtk:widget-state-flags (widget)

widget -- a gtk:widget object
flags -- a gtk:state-flags value with the state flags
clear -- an optional boolean whether to clear state before turning on flags

Accessor of the stage flags of the widget. The gtk:widget-state-flags function returns the widget state as a flag set. The (setf gtk:widget-state-flags) function sets the widget state flags. This function is for use in widget implementations. Turns on flag values in the current widget state, insensitive, prelighted, etc.

It is worth mentioning that any other state than :insensitive, will be propagated down to all non-internal children if the widget is a gtk:container widget, while :insensitive itself will be propagated down to all gtk:container children by different means than turning on the state flag down the hierarchy, both gtk:widget-state-flags and gtk:widget-is-sensitive functions will make use of these.