The pango-direction enumeration represents a direction in the Unicode bidirectional algorithm. Not every value in this enumeration makes sense for every usage of pango-direction. For example, the return value of the functions pango-unichar-direction and pango-find-base-dir cannot be :weak-ltr or :weak-rtl, since every character is either neutral or has a strong direction. On the other hand :neutral does not make sense to pass to the function pango-itemize-with-base-dir.

The :ttb-ltr, :ttb-rtl values come from an earlier interpretation of this enumeration as the writing direction of a block of text and are no longer used. See the pango-gravity enumeration for how vertical text is handled in Pango.

(define-g-enum "PangoDirection" pango-direction
  (:export t
   :type-initializer "pango_direction_get_type")
  (:ltr 0)
  (:rtl 1)
  (:ttb-ltr 2)
  (:ttb-rtl 3)
  (:weak-ltr 4)
  (:weak-rtl 5)
  (:neutral 6))  

:ltr

A strong left-to-right direction.

:rtl

A strong right-to-left direction.

:ttb-ltr

Deprecated value; treated the same as :rtl.

:ttb-rtl

Deprecated value; treated the same as :ltr.

:weak-ltr

A weak left-to-right direction.

:wek-rtl

A weak right-to-left direction.

:neutral

No direction specified.