Trait script_layout_interface::wrapper_traits::ThreadSafeLayoutNode

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pub trait ThreadSafeLayoutNode<'dom>: Clone + Copy + Debug + NodeInfo + PartialEq + Sized {
    type ConcreteNode: LayoutNode<'dom, ConcreteThreadSafeLayoutNode = Self>;
    type ConcreteElement: TElement;
    type ConcreteThreadSafeLayoutElement: ThreadSafeLayoutElement<'dom, ConcreteThreadSafeLayoutNode = Self> + Element<Impl = SelectorImpl>;
    type ChildrenIterator: Iterator<Item = Self> + Sized;

Show 33 methods    // Required methods
    fn opaque(&self) -> OpaqueNode;
    fn type_id(&self) -> Option<LayoutNodeType>;
    fn parent_style(&self) -> Arc<ComputedValues>;
    fn debug_id(self) -> usize;
    fn children(&self) -> LayoutIterator<Self::ChildrenIterator>;
    fn as_element(&self) -> Option<Self::ConcreteThreadSafeLayoutElement>;
    fn as_html_element(&self) -> Option<Self::ConcreteThreadSafeLayoutElement>;
    fn style_data(&self) -> Option<&'dom StyleData>;
    fn layout_data(&self) -> Option<&'dom GenericLayoutData>;
    fn is_ignorable_whitespace(&self, context: &SharedStyleContext<'_>) -> bool;
    fn unsafe_get(self) -> Self::ConcreteNode;
    fn node_text_content(self) -> Cow<'dom, str>;
    fn selection(&self) -> Option<Range<ByteIndex>>;
    fn image_url(&self) -> Option<ServoUrl>;
    fn image_density(&self) -> Option<f64>;
    fn image_data(
        &self,
    ) -> Option<(Option<StdArc<Image>>, Option<ImageMetadata>)>;
    fn canvas_data(&self) -> Option<HTMLCanvasData>;
    fn svg_data(&self) -> Option<SVGSVGData>;
    fn media_data(&self) -> Option<HTMLMediaData>;
    fn iframe_browsing_context_id(&self) -> Option<BrowsingContextId>;
    fn iframe_pipeline_id(&self) -> Option<PipelineId>;
    fn get_span(&self) -> Option<u32>;
    fn get_colspan(&self) -> Option<u32>;
    fn get_rowspan(&self) -> Option<u32>;

    // Provided methods
    fn get_before_pseudo(&self) -> Option<Self> { ... }
    fn get_after_pseudo(&self) -> Option<Self> { ... }
    fn get_details_summary_pseudo(&self) -> Option<Self> { ... }
    fn get_details_content_pseudo(&self) -> Option<Self> { ... }
    fn get_pseudo_element_type(&self) -> PseudoElementType { ... }
    fn style(&self, context: &SharedStyleContext<'_>) -> Arc<ComputedValues> { ... }
    fn selected_style(&self) -> Arc<ComputedValues> { ... }
    fn is_content(&self) -> bool { ... }
    fn fragment_type(&self) -> FragmentType { ... }
}

Expand description

A thread-safe version of LayoutNode, used during flow construction. This type of layout node does not allow any parents or siblings of nodes to be accessed, to avoid races.

Required Associated Types§

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type ConcreteNode: LayoutNode<'dom, ConcreteThreadSafeLayoutNode = Self>

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type ConcreteElement: TElement

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type ConcreteThreadSafeLayoutElement: ThreadSafeLayoutElement<'dom, ConcreteThreadSafeLayoutNode = Self> + Element<Impl = SelectorImpl>

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type ChildrenIterator: Iterator<Item = Self> + Sized

Required Methods§

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fn opaque(&self) -> OpaqueNode

Converts self into an OpaqueNode.

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fn type_id(&self) -> Option<LayoutNodeType>

Returns the type ID of this node. Returns None if this is a pseudo-element; otherwise, returns Some.

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fn parent_style(&self) -> Arc<ComputedValues>

Returns the style for a text node. This is computed on the fly from the parent style to avoid traversing text nodes in the style system.

Note that this does require accessing the parent, which this interface technically forbids. But accessing the parent is only unsafe insofar as it can be used to reach siblings and cousins. A simple immutable borrow of the parent data is fine, since the bottom-up traversal will not process the parent until all the children have been processed.

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fn debug_id(self) -> usize

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fn children(&self) -> LayoutIterator<Self::ChildrenIterator>

Returns an iterator over this node’s children.

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fn as_element(&self) -> Option<Self::ConcreteThreadSafeLayoutElement>

Returns a ThreadSafeLayoutElement if this is an element, None otherwise.

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fn as_html_element(&self) -> Option<Self::ConcreteThreadSafeLayoutElement>

Returns a ThreadSafeLayoutElement if this is an element in an HTML namespace, None otherwise.

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fn style_data(&self) -> Option<&'dom StyleData>

Get the StyleData for this node. Returns None if the node is unstyled.

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fn layout_data(&self) -> Option<&'dom GenericLayoutData>

Get the layout data of this node, attempting to downcast it to the desired type. Returns None if there is no layout data or it isn’t of the desired type.

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fn is_ignorable_whitespace(&self, context: &SharedStyleContext<'_>) -> bool

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fn unsafe_get(self) -> Self::ConcreteNode

Returns access to the underlying LayoutNode. This is breaks the abstraction barrier of ThreadSafeLayout wrapper layer, and can lead to races if not used carefully.

We need this because the implementation of some methods need to access the layout data flags, and we have this annoying trait separation between script and layout :-(

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fn node_text_content(self) -> Cow<'dom, str>

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fn selection(&self) -> Option<Range<ByteIndex>>

If the insertion point is within this node, returns it. Otherwise, returns None.

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fn image_url(&self) -> Option<ServoUrl>

If this is an image element, returns its URL. If this is not an image element, fails.

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fn image_density(&self) -> Option<f64>

If this is an image element, returns its current-pixel-density. If this is not an image element, fails.

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fn image_data(&self) -> Option<(Option<StdArc<Image>>, Option<ImageMetadata>)>

If this is an image element, returns its image data. Otherwise, returns None.

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fn iframe_browsing_context_id(&self) -> Option<BrowsingContextId>

If this node is an iframe element, returns its browsing context ID. If this node is not an iframe element, fails. Returns None if there is no nested browsing context.

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fn iframe_pipeline_id(&self) -> Option<PipelineId>

If this node is an iframe element, returns its pipeline ID. If this node is not an iframe element, fails. Returns None if there is no nested browsing context.

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