It is often useful to create a text style object that represents a style you wish to use frequently, rather than continually specifying the corresponding text style suboptions.
For example, if you want to write on a stream with a particular family, face, and size, you can create a text style object using make-text-style :
((clim:make-text-style :fix :bold :large) my-stream)
(write-string "Here is a text-style example." my-stream))
Note that text style objects are interned. That is, two different invocations of make-text- style with the same combination of family, face and size will result in the same (in the sense of eq ) text style object. For this reason, you should not modify text style objects.
text-style [Protocol Class]
Summary: The protocol class for text styles. If you want to create a new class that behaves like a text style, it should be a subclass of text-style . Subclasses of text-style must obey the text style protocol.
Summary: Returns t if object is a text style; otherwise, it returns nil .
Summary: An instantiable class that implements text styles. It is a subclass of text-style . This is the class that make-text-style instantiates. Members of this class are immutable.
Arguments: family face size
Summary: Returns an object of class standard-text-style with a family of family , a face of face , and a size of size .
family is one of :fix , :serif , :sans-serif , or nil .
face is one of :roman , :bold , :italic , (:bold :italic) , or nil .
size is a real number representing the size in printer's points, one of the logical sizes ( :normal , :tiny , :very-small , :small , :large , :very-large , :huge ), a relative size ( :smaller or :larger ), or nil .
You can use text style suboptions to specify characteristics of a text style object. Each text style suboption has a reader function which returns the current value of that component from a text style object. The suboptions are listed as follows.
text-style-family [Generic Function]
Summary: Specifies the family of the text style text-style .
text-style-face [Generic Function]
Summary: Specifies the face of the text style text-style .
text-style-size [Generic Function]
Summary: Specifies the size of the text style text-style .
Common Lisp Interface Manager 2.0 User's Guide - 20 Sep 2011