Direction
PangoDirection
represents a direction in the Unicode bidirectional algorithm.
Not every value in this enumeration makes sense for every usage of PangoDirection
; for example, the return value of func@unichar_direction and func@find_base_dir cannot be PANGO_DIRECTION_WEAK_LTR
or PANGO_DIRECTION_WEAK_RTL
, since every character is either neutral or has a strong direction; on the other hand PANGO_DIRECTION_NEUTRAL
doesn't make sense to pass to func@itemize_with_base_dir.
The PANGO_DIRECTION_TTB_LTR
, PANGO_DIRECTION_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 PangoGravity
for how vertical text is handled in Pango.
If you are interested in text direction, you should really use fribidi directly. PangoDirection
is only retained because it is used in some public apis.