Struct style::values::specified::box_::WillChange

#[repr(C)]
pub struct WillChange {
    features: OwnedSlice<CustomIdent>,
    bits: WillChangeBits,
}

Provides a rendering hint to the user agent, stating what kinds of changes the author expects to perform on the element.

auto is represented by an empty features list.

https://drafts.csswg.org/css-will-change/#will-change

Fields

features: OwnedSlice<CustomIdent>

The features that are supposed to change.

TODO(emilio): Consider using ArcSlice since we just clone them from the specified value? That’d save an allocation, which could be worth it.

bits: WillChangeBits

A bitfield with the kind of change that the value will create, based on the above field.

Implementations

impl WillChange

pub fn auto() -> Self

Get default value of will-change as auto

Trait Implementations

impl Clone for WillChange

fn clone(&self) -> WillChange

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for WillChange

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

Formats the value using the given formatter.

impl Default for WillChange

fn default() -> WillChange

Returns the “default value” for a type.

impl MallocSizeOf for WillChange

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 Parse for WillChange

fn parse<'i, 't>( context: &ParserContext<'_>, input: &mut Parser<'i, 't>, ) -> Result<Self, ParseError<'i>>

auto | #

impl PartialEq for WillChange

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

Tests for self and other values to be equal, and is used by ==.

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

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

impl SpecifiedValueInfo for WillChange

const SUPPORTED_TYPES: u8 = 0u8

Supported CssTypes by the given value type.

fn collect_completion_keywords(_f: &mut dyn FnMut(&[&'static str]))

Collect value starting words for the given specified value type. This includes keyword and function names which can appear at the beginning of a value of this type.

impl ToComputedValue for WillChange

where OwnedSlice<CustomIdent>: ToComputedValue<ComputedValue = OwnedSlice<CustomIdent>>, WillChangeBits: ToComputedValue<ComputedValue = WillChangeBits>,

type ComputedValue = WillChange

The computed value type we’re going to be converted to.

fn from_computed_value(from: &Self::ComputedValue) -> Self

Convert a computed value to specified value form.

fn to_computed_value(&self, context: &Context<'_>) -> Self::ComputedValue

Convert a specified value to a computed value, using itself and the data inside the Context.

impl ToCss for WillChange

fn to_css<W>(&self, dest: &mut CssWriter<'_, W>) -> Result

where W: Write,

Serialize self in CSS syntax, writing to dest.

fn to_css_string(&self) -> String

Serialize self in CSS syntax and return a string.

impl ToResolvedValue for WillChange

where OwnedSlice<CustomIdent>: ToResolvedValue<ResolvedValue = OwnedSlice<CustomIdent>>, WillChangeBits: ToResolvedValue<ResolvedValue = WillChangeBits>,

type ResolvedValue = WillChange

The resolved value type we’re going to be converted to.

fn from_resolved_value(from: Self::ResolvedValue) -> Self

Convert a resolved value to resolved value form.

fn to_resolved_value(self, context: &Context<'_>) -> Self::ResolvedValue

Convert a resolved value to a resolved value.

impl ToShmem for WillChange

fn to_shmem(&self, builder: &mut SharedMemoryBuilder) -> Result<Self>

Clones this value into a form suitable for writing into a SharedMemoryBuilder.

impl StructuralPartialEq for WillChange