#[repr(u8)]
pub enum CascadeLevel { UANormal, UserNormal, PresHints, AuthorNormal { shadow_cascade_order: ShadowCascadeOrder, }, SMILOverride, Animations, AuthorImportant { shadow_cascade_order: ShadowCascadeOrder, }, UserImportant, UAImportant, Transitions, }
Expand description

The cascade level these rules are relevant at, as per13.

Presentational hints for SVG and HTML are in the “author-level zero-specificity” level, that is, right after user rules, and before author rules.

The order of variants declared here is significant, and must be in ascending order of precedence.

See also 4 for the Shadow DOM bits. We rely on the invariant that rules from outside the tree the element is in can’t affect the element.

The opposite is not true (i.e., :host and ::slotted) from an “inner” shadow tree may affect an element connected to the document or an “outer” shadow tree.

Variants§

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UANormal

Normal User-Agent rules.

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UserNormal

User normal rules.

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PresHints

Presentational hints.

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AuthorNormal

Fields

§shadow_cascade_order: ShadowCascadeOrder

The order in the shadow tree hierarchy. This number is relative to the tree of the element, and thus the only invariants that need to be preserved is:

  • Zero is the same tree as the element that matched the rule. This is important so that we can optimize style attribute insertions.

  • The levels are ordered in accordance with https://drafts.csswg.org/css-scoping/#shadow-cascading

Shadow DOM styles from author styles.

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SMILOverride

SVG SMIL animations.

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Animations

CSS animations and script-generated animations.

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AuthorImportant

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§shadow_cascade_order: ShadowCascadeOrder

The order in the shadow tree hierarchy, inverted, so that PartialOrd does the right thing.

Author-supplied important rules.

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UserImportant

User important rules.

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UAImportant

User-agent important rules.

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Transitions

Transitions

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impl CascadeLevel

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pub fn important(&self) -> Self

Convert this level from “unimportant” to “important”.

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pub fn unimportant(&self) -> Self

Convert this level from “important” to “non-important”.

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pub fn guard<'a>( &self, guards: &'a StylesheetGuards<'a> ) -> &'a SharedRwLockReadGuard<'a>

Select a lock guard for this level

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pub fn same_tree_author_important() -> Self

Returns the cascade level for author important declarations from the same tree as the element.

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pub fn same_tree_author_normal() -> Self

Returns the cascade level for author normal declarations from the same tree as the element.

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pub fn is_important(&self) -> bool

Returns whether this cascade level represents important rules of some sort.

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pub fn importance(&self) -> Importance

Returns the importance relevant for this rule. Pretty similar to is_important.

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pub fn origin(&self) -> Origin

Returns the cascade origin of the rule.

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pub fn is_animation(&self) -> bool

Returns whether this cascade level represents an animation rules.

Trait Implementations§

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impl Clone for CascadeLevel

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fn clone(&self) -> CascadeLevel

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for CascadeLevel

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

Formats the value using the given formatter. Read more
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impl Hash for CascadeLevel

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

Feeds this value into the given Hasher. Read more
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fn hash_slice<H>(data: &[Self], state: &mut H)where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher. Read more
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impl MallocSizeOf for CascadeLevel

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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.
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impl Ord for CascadeLevel

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

This method returns an Ordering between self and other. Read more
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fn max(self, other: Self) -> Selfwhere Self: Sized,

Compares and returns the maximum of two values. Read more
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fn min(self, other: Self) -> Selfwhere Self: Sized,

Compares and returns the minimum of two values. Read more
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fn clamp(self, min: Self, max: Self) -> Selfwhere Self: Sized + PartialOrd<Self>,

Restrict a value to a certain interval. Read more
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impl PartialEq<CascadeLevel> for CascadeLevel

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

This method tests for self and other values to be equal, and is used by ==.
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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.
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impl PartialOrd<CascadeLevel> for CascadeLevel

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

This method returns an ordering between self and other values if one exists. Read more
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fn lt(&self, other: &Rhs) -> bool

This method tests less than (for self and other) and is used by the < operator. Read more
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fn le(&self, other: &Rhs) -> bool

This method tests less than or equal to (for self and other) and is used by the <= operator. Read more
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fn gt(&self, other: &Rhs) -> bool

This method tests greater than (for self and other) and is used by the > operator. Read more
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fn ge(&self, other: &Rhs) -> bool

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

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impl Eq for CascadeLevel

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impl StructuralEq for CascadeLevel

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impl StructuralPartialEq for CascadeLevel

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impl<T> Any for Twhere T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<Q, K> Comparable<K> for Qwhere Q: Ord + ?Sized, K: Borrow<Q> + ?Sized,

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fn compare(&self, key: &K) -> Ordering

Compare self to key and return their ordering.
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impl<Q, K> Equivalent<K> for Qwhere Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

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fn equivalent(&self, key: &K) -> bool

Checks if this value is equivalent to the given key. Read more
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fn equivalent(&self, key: &K) -> bool

Compare self to key and return true if they are equal.
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impl<Q, K> Equivalent<K> for Qwhere Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

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fn equivalent(&self, key: &K) -> bool

Compare self to key and return true if they are equal.
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impl<T> From<T> for T

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Returns the argument unchanged.

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impl<T, U> Into<U> for Twhere U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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const ALIGN: usize = _

The alignment of pointer.
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type Init = T

The type for initializers.
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unsafe fn init(init: <T as Pointable>::Init) -> usize

Initializes a with the given initializer. Read more
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Dereferences the given pointer. Read more
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