Enum harfbuzz::Direction

pub enum Direction {
    Invalid,
    LTR,
    RTL,
    TTB,
    BTT,
}

Direction of text flow during layout.

This maps to the hb_direction_t from harfbuzz-sys. It can be converted to or from hb_direction_t using the From and Into traits:

assert_eq!(Direction::from(sys::HB_DIRECTION_LTR), Direction::LTR);
assert_eq!(sys::hb_direction_t::from(Direction::BTT), sys::HB_DIRECTION_BTT);

let hb_dir: sys::hb_direction_t = Direction::LTR.into();
assert_eq!(hb_dir, sys::HB_DIRECTION_LTR);

let dir: Direction = sys::HB_DIRECTION_TTB.into();
assert_eq!(dir, Direction::TTB);

Variants

Invalid

Initial, unset direction.

This corresponds to HB_DIRECTION_INVALID.

LTR

Text is set horizontally from left to right.

This corresponds to HB_DIRECTION_LTR.

RTL

Text is set horizontally from right to left.

This corresponds to HB_DIRECTION_RTL.

TTB

Text is set vertically from top to bottom.

This corresponds to HB_DIRECTION_TTB.

BTT

Text is set vertically from bottom to top.

This corresponds to HB_DIRECTION_BTT.

Trait Implementations

impl PartialOrd<Direction> for Direction

fn partial_cmp(&self, other: &Direction) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

#[must_use]

fn lt(&self, other: &Rhs) -> bool

This method tests less than (for self and other) and is used by the < operator.

#[must_use]

fn le(&self, other: &Rhs) -> bool

This method tests less than or equal to (for self and other) and is used by the <= operator.

#[must_use]

fn gt(&self, other: &Rhs) -> bool

This method tests greater than (for self and other) and is used by the > operator.

#[must_use]

fn ge(&self, other: &Rhs) -> bool

This method tests greater than or equal to (for self and other) and is used by the >= operator.

impl Copy for Direction

impl PartialEq<Direction> for Direction

fn eq(&self, other: &Direction) -> bool

This method tests for self and other values to be equal, and is used by ==.

#[must_use]

fn ne(&self, other: &Rhs) -> bool

This method tests for !=.

impl From<u32> for Direction

fn from(s: hb_direction_t) -> Self

Performs the conversion.

impl From<Direction> for hb_direction_t

fn from(s: Direction) -> Self

Performs the conversion.

impl Clone for Direction

fn clone(&self) -> Direction

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Direction

fn fmt(&self, f: &mut Formatter) -> Result

Formats the value using the given formatter.