#[non_exhaustive]
pub enum Direction {
    Ltr,
    Rtl,
    TtbLtr,
    TtbRtl,
    WeakLtr,
    WeakRtl,
    Neutral,
    // some variants omitted
}
Expand description

Direction represents a direction in the Unicode bidirectional algorithm.

Not every value in this enumeration makes sense for every usage of Direction; for example, the return value of unichar_direction() and 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 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 Gravity for how vertical text is handled in Pango.

If you are interested in text direction, you should really use fribidi directly. Direction is only retained because it is used in some public apis.

Variants (Non-exhaustive)

This enum is marked as non-exhaustive
Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

Ltr

A strong left-to-right direction

Rtl

A strong right-to-left direction

TtbLtr

Deprecated value; treated the same as PANGO_DIRECTION_RTL.

TtbRtl

Deprecated value; treated the same as PANGO_DIRECTION_LTR

WeakLtr

A weak left-to-right direction

WeakRtl

A weak right-to-left direction

Neutral

No direction specified

Trait Implementations

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