PangoDirection
The PangoDirection type 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 pango_unichar_direction()
and pango_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
pango_log2vis_get_embedding_levels().
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 the
Text module of the CSS3 spec for how vertical text is planned to be handled
in a future version of Pango. The explanation of why
Pango::DIRECTION_TTB_LTR is treated as
PANGO_DIRECTION_RTL can be found there as well.
Value | Symbolic name | Description | | 0 | Pango::DIRECTION_LTR |
A strong left-to-right direction.
| | 1 | Pango::DIRECTION_RTL |
A strong right-to-left direction.
| | 2 | Pango::DIRECTION_TTB_LTR |
Deprecated value; treated the same as Pango::DIRECTION_RTL.
| | 3 | Pango::DIRECTION_TTB_RTL |
Deprecated value; treated the same as Pango::DIRECTION_LTR.
| | 4 | Pango::DIRECTION_WEAK_LTR |
A weak left-to-right direction.
| | 5 | Pango::DIRECTION_WEAK_RTL |
A weak right-to-left direction.
| | 6 | Pango::DIRECTION_NEUTRAL |
No direction specified.
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User Contributed Notes
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