pango-Bidirectional-Text: Bidirectional Text
Description
Types and functions to help with handling bidirectional textDetailed Description
Pango supports bidirectional text (like Arabic and Hebrew) automatically.
Some applications however, need some help to correctly handle bidirectional
text. The PangoDirection type can be used with pangoContextSetBaseDir to
instruct Pango about direction of text, though in most cases Pango detects
that correctly and automatically. The rest of the facilities in this section
are used internally by Pango already, and are provided to help applications
that need more direct control over bidirectional setting of text.Enums and Flags
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 pangoUnicharDirection
and pangoFindBaseDir 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 pangoItemizeWithBaseDir. 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.
ltr- A strong left-to-right direction
rtl- A strong right-to-left direction
ttb-ltr- Deprecated value; treated the
same as
PANGO_DIRECTION_RTL. ttb-rtl- Deprecated value; treated the
same as
PANGO_DIRECTION_LTR
PangoBidiType-
The
PangoBidiType type represents the bidirectional character
type of a Unicode character as specified by the
Unicode bidirectional algorithm (http://www.unicode.org/reports/tr9/).
Since 1.22
l- Left-to-Right
lre- Left-to-Right Embedding
lro- Left-to-Right Override
r- Right-to-Left
al- Right-to-Left Arabic
rle- Right-to-Left Embedding
rlo- Right-to-Left Override
pdf- Pop Directional Format
en- European Number
es- European Number Separator
et- European Number Terminator
an- Arabic Number
cs- Common Number Separator
nsm- Nonspacing Mark
bn- Boundary Neutral
b- Paragraph Separator
s- Segment Separator
ws- Whitespace
on- Other Neutrals