Struct layout_2020::display_list::DisplayListBuilder

pub(crate) struct DisplayListBuilder<'a> {
    current_scroll_node_id: ScrollTreeNodeId,
    current_reference_frame_scroll_node_id: ScrollTreeNodeId,
    current_clip_chain_id: ClipChainId,
    element_for_canvas_background: OpaqueNode,
    pub context: &'a LayoutContext<'a>,
    pub display_list: &'a mut DisplayList,
    iframe_sizes: FnvHashMap<BrowsingContextId, Size2D<f32, CSSPixel>>,
    is_contentful: bool,
}

Fields

current_scroll_node_id: ScrollTreeNodeId

The current ScrollTreeNodeId for this DisplayListBuilder. This allows only passing the builder instead passing the containing stacking_context::StackingContextContent::Fragment as an argument to display list building functions.

current_reference_frame_scroll_node_id: ScrollTreeNodeId

The current ScrollTreeNodeId for this DisplayListBuilder. This is necessary in addition to the Self::current_scroll_node_id, because some pieces of fragments as backgrounds with background-attachment: fixed need to not scroll while the rest of the fragment does.

current_clip_chain_id: ClipChainId

The current wr::ClipId for this DisplayListBuilder. This allows only passing the builder instead passing the containing stacking_context::StackingContextContent::Fragment as an argument to display list building functions.

element_for_canvas_background: OpaqueNode

The OpaqueNode handle to the node used to paint the page background if the background was a canvas.

context: &'a LayoutContext<'a>

A LayoutContext used to get information about the device pixel ratio and get handles to WebRender images.

display_list: &'a mut DisplayList

The DisplayList used to collect display list items and metadata.

iframe_sizes: FnvHashMap<BrowsingContextId, Size2D<f32, CSSPixel>>

A recording of the sizes of iframes encountered when building this display list. This information is forwarded to layout for the iframe so that its layout knows how large the initial containing block / viewport is.

is_contentful: bool

Contentful paint i.e. whether the display list contains items of type text, image, non-white canvas or SVG). Used by metrics. See https://w3c.github.io/paint-timing/#first-contentful-paint.

Implementations

impl<'a> DisplayListBuilder<'a>

fn wr(&mut self) -> &mut DisplayListBuilder

fn common_properties( &self, clip_rect: LayoutRect, style: &ComputedValues, ) -> CommonItemProperties

fn hit_info( &mut self, style: &ComputedValues, tag: Option<Tag>, auto_cursor: Cursor, ) -> Option<(u64, u16)>