gtk:widget-hexpand-set (object)

object -- a gtk:widget object
setting -- a boolean whether to use the hexpand property

The accessor for the hexpand-set slot of the gtk:widget class gets or sets whether to use the hexpand property.

The hexpand-set property will be set automatically when you call the gtk:widget-hexpand function to set the hexpand property, so the most likely reason to use the (setf gtk:widget-hexpand-set) function would be to unset an explicit expand flag.

If the hexpand property is set, then it overrides any computed expand value based on child widgets. If the hexpand property is not set, then the expand value depends on whether any children of the widget would like to expand. There are few reasons to use this function, but it is here for completeness and consistency.