2.  Widget Classes  

(class? x)

Returns #t iff x is an object of type class (widget class).

(find-class name-of-class)

Returns the widget class of the specified name (an object of type class). name-of-class is a string or a symbol.

(class-resources widget-class)

See XtGetResourceList. Returns the resource list of the specified widget class. Each element of the list is a list of three symbols - the resource name, the resource class, and the resource type.

(class-constraint-resources widget-class)

See XtGetConstraintRespourceList. Returns the list of constraint resources that are defined for the specified widget class. Each element of the list is a list of three symbols - the resource name, the resource class, and the resource type.

(class-sub-resources widget-class)

Returns the list of sub-resources (if there are any) of the specified widget class. See class-resources above.

(class-exists? name-of-class)

Returns #t iff a widget class of the given name exists (i.e. has been loaded by means of load-widgets). name-of-class is a string or a symbol.


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