Struct style::rule_tree::level::ShadowCascadeOrder

pub struct ShadowCascadeOrder(i8);

A counter to track how many shadow root rules deep we are. This is used to handle:

https://drafts.csswg.org/css-scoping/#shadow-cascading

See the static functions for the meaning of different values.

Tuple Fields

0: i8

Implementations

impl ShadowCascadeOrder

const MAX: i8 = 7i8

We keep a maximum of 3 bits of order as a limit so that we can pack CascadeLevel in one byte by using half of it for the order, if that ends up being necessary.

const MIN: i8 = -7i8

pub fn for_outermost_shadow_tree() -> Self

A level for the outermost shadow tree (the shadow tree we own, and the ones from the slots we’re slotted in).

fn for_same_tree() -> Self

A level for the element’s tree.

pub fn for_innermost_containing_tree() -> Self

A level for the innermost containing tree (the one closest to the element).

pub fn dec(&mut self)

Decrement the level, moving inwards. We should only move inwards if we’re traversing slots.

pub fn inc(&mut self)

The level, moving inwards. We should only move inwards if we’re traversing slots.

Trait Implementations

impl Clone for ShadowCascadeOrder

fn clone(&self) -> ShadowCascadeOrder

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for ShadowCascadeOrder

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

Formats the value using the given formatter.

impl Hash for ShadowCascadeOrder

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl MallocSizeOf for ShadowCascadeOrder

fn size_of(&self, ops: &mut MallocSizeOfOps) -> usize

Measure the heap usage of all descendant heap-allocated structures, but not the space taken up by the value itself.

impl Neg for ShadowCascadeOrder

type Output = ShadowCascadeOrder

The resulting type after applying the - operator.

fn neg(self) -> Self

Performs the unary - operation.

impl Ord for ShadowCascadeOrder

fn cmp(&self, other: &ShadowCascadeOrder) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized + PartialOrd,

Restrict a value to a certain interval.

impl PartialEq for ShadowCascadeOrder

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

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

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

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl PartialOrd for ShadowCascadeOrder

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

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

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

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

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

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

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

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

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 ShadowCascadeOrder

impl Eq for ShadowCascadeOrder

impl StructuralPartialEq for ShadowCascadeOrder