Struct script::dom::bindings::root::Root

pub struct Root<T: StableTraceObject> {
    value: T,
    root_list: *const RootCollection,
}

A rooted value.

Fields

value: T

The value to root.

root_list: *const RootCollection

List that ensures correct dynamic root ordering

Implementations

impl<T> Root<T>

where T: StableTraceObject + 'static,

pub unsafe fn new(value: T) -> Self

Create a new stack-bounded root for the provided value. It cannot outlive its associated RootCollection, and it gives out references which cannot outlive this new Root.

impl<T: Castable> Root<Dom<T>>

pub fn upcast<U>(root: Root<Dom<T>>) -> Root<Dom<U>>

where U: Castable, T: DerivedFrom<U>,

Cast a DOM object root upwards to one of the interfaces it derives from.

pub fn downcast<U>(root: Root<Dom<T>>) -> Option<Root<Dom<U>>>

where U: DerivedFrom<T>,

Cast a DOM object root downwards to one of the interfaces it might implement.

impl<T: DomObject> Root<Dom<T>>

pub fn from_ref(unrooted: &T) -> Root<Dom<T>>

Generate a new root from a reference

pub(crate) fn as_traced(&self) -> Dom<T>

Create a traced version of this rooted object.

Safety

This should never be used to create on-stack values. Instead these values should always end up as members of other DOM objects.

impl<T> Root<MaybeUnreflectedDom<T>>

where T: DomObject,

pub fn as_ptr(&self) -> *const T

impl<T> Root<MaybeUnreflectedDom<T>>

where T: MutDomObject,

pub unsafe fn reflect_with(self, obj: *mut JSObject) -> Root<Dom<T>>

Trait Implementations

impl<T> Clone for Root<Dom<T>>

where T: DomObject,

fn clone(&self) -> Root<Dom<T>>

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for Root<Dom<Element>>

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

Formats the value using the given formatter.

impl<T> Deref for Root<T>

where T: Deref + StableTraceObject,

type Target = <T as Deref>::Target

The resulting type after dereferencing.

fn deref(&self) -> &Self::Target

Dereferences the value.

impl<T> Drop for Root<T>

where T: StableTraceObject,

fn drop(&mut self)

Executes the destructor for this type.

impl Element for Root<Dom<Element>>

type Impl = SelectorImpl

fn opaque(&self) -> OpaqueElement

Converts self into an opaque representation.

fn parent_element(&self) -> Option<Root<Dom<Element>>>

fn parent_node_is_shadow_root(&self) -> bool

Whether the parent node of this element is a shadow root.

fn containing_shadow_host(&self) -> Option<Self>

The host of the containing shadow root, if any.

fn is_pseudo_element(&self) -> bool

Whether we’re matching on a pseudo-element.

fn match_pseudo_element( &self, _pseudo: &PseudoElement, _context: &mut MatchingContext<'_, Self::Impl>, ) -> bool

fn prev_sibling_element(&self) -> Option<Root<Dom<Element>>>

Skips non-element nodes

fn next_sibling_element(&self) -> Option<Root<Dom<Element>>>

Skips non-element nodes

fn first_element_child(&self) -> Option<Root<Dom<Element>>>

Skips non-element nodes

fn attr_matches( &self, ns: &NamespaceConstraint<&Namespace>, local_name: &LocalName, operation: &AttrSelectorOperation<&AtomString>, ) -> bool

fn is_root(&self) -> bool

Returns whether this element matches :root, i.e. whether it is the root element of a document.

fn is_empty(&self) -> bool

Returns whether this element matches :empty.

fn has_local_name(&self, local_name: &LocalName) -> bool

fn has_namespace(&self, ns: &Namespace) -> bool

Empty string for no namespace

fn is_same_type(&self, other: &Self) -> bool

Whether this element and the other element have the same local name and namespace.

fn match_non_ts_pseudo_class( &self, pseudo_class: &NonTSPseudoClass, _: &mut MatchingContext<'_, Self::Impl>, ) -> bool

fn is_link(&self) -> bool

Whether this element is a link.

fn has_id(&self, id: &AtomIdent, case_sensitivity: CaseSensitivity) -> bool

fn is_part(&self, _name: &AtomIdent) -> bool

fn imported_part(&self, _: &AtomIdent) -> Option<AtomIdent>

Returns the mapping from the exportparts attribute in the reverse direction, that is, in an outer-tree -> inner-tree direction.

fn has_class(&self, name: &AtomIdent, case_sensitivity: CaseSensitivity) -> bool

fn is_html_element_in_html_document(&self) -> bool

fn is_html_slot_element(&self) -> bool

Returns whether the element is an HTML element.

fn apply_selector_flags(&self, flags: ElementSelectorFlags)

Sets selector flags on the elemnt itself or the parent, depending on the flags, which indicate what kind of work may need to be performed when DOM state changes.

fn add_element_unique_hashes(&self, filter: &mut BloomFilter) -> bool

Add hashes unique to this element to the given filter, returning true if any got added.

fn has_custom_state(&self, _name: &AtomIdent) -> bool

fn pseudo_element_originating_element(&self) -> Option<Self>

The parent of a given pseudo-element, after matching a pseudo-element selector.

fn has_attr_in_no_namespace( &self, local_name: &<Self::Impl as SelectorImpl>::LocalName, ) -> bool

fn assigned_slot(&self) -> Option<Self>

Returns the assigned element this element is assigned to.

fn ignores_nth_child_selectors(&self) -> bool

Returns whether this element should ignore matching nth child selector.

impl<T: DomObject + IDLInterface> FromJSValConvertible for Root<Dom<T>>

type Config = ()

Optional configurable behaviour switch; use () for no configuration.

unsafe fn from_jsval( cx: *mut JSContext, value: HandleValue<'_>, _config: Self::Config, ) -> Result<ConversionResult<Root<Dom<T>>>, ()>

Convert val to type Self. Optional configuration of type T can be passed as the option argument. If it returns Err(()), a JSAPI exception is pending. If it returns Ok(Failure(reason)), there is no pending JSAPI exception.

impl<T> MallocSizeOf for Root<Dom<T>>

where T: DomObject + MallocSizeOf,

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<T> PartialEq for Root<Dom<T>>

where T: DomObject,

fn eq(&self, other: &Self) -> 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<T: DomObject> ToJSValConvertible for Root<Dom<T>>

unsafe fn to_jsval(&self, cx: *mut JSContext, rval: MutableHandleValue<'_>)

Convert self to a JSVal. JSAPI failure causes a panic.

impl<T> Traceable for Root<Dom<T>>

where T: DomObject,

unsafe fn trace(&self, _: *mut JSTracer)

Trace self.