Struct LayoutTree 

pub struct LayoutTree {
    pub nodes: Vec<LayoutNode>,
    pub root: usize,
    pub dom_to_layout: BTreeMap<NodeId, Vec<usize>>,
}

The complete layout tree structure

Fields

nodes: Vec<LayoutNode>

Arena-style storage for layout nodes

root: usize

Root node index

dom_to_layout: BTreeMap<NodeId, Vec<usize>>

Mapping from DOM node IDs to layout node indices

Implementations

impl LayoutTree

pub fn get(&self, index: usize) -> Option<&LayoutNode>

pub fn get_mut(&mut self, index: usize) -> Option<&mut LayoutNode>

pub fn root_node(&self) -> &LayoutNode

pub fn mark_dirty(&mut self, start_index: usize, flag: DirtyFlag)

Marks a node and its ancestors as dirty with the given flag.

The dirty state is “upgraded” if the new flag is more severe than the existing one (e.g., upgrading from Paint to Layout). Propagation stops if an ancestor is already marked with an equal or more severe flag.

pub fn mark_subtree_dirty(&mut self, start_index: usize, flag: DirtyFlag)

Marks a node and its entire subtree of descendants with the given dirty flag.

This is used for inherited CSS properties. Each node in the subtree will be upgraded to at least the new flag’s severity.

pub fn clear_all_dirty_flags(&mut self)

Resets the dirty flags of all nodes in the tree to None after layout is complete.

pub fn get_inline_layout_for_node( &self, layout_index: usize, ) -> Option<&Arc<UnifiedLayout>>

Get inline layout for a node, navigating through IFC membership if needed.

For text nodes that participate in an IFC (Inline Formatting Context), the actual inline_layout_result is stored on the IFC root node (the block container), not on the text node itself. This method handles both cases:

1. If the node has its own inline_layout_result, return it directly
2. If the node has ifc_membership, navigate to the IFC root and return its layout

This mirrors the W3C Selection model where:

• Selection.focusNode points to the TEXT node
• But the layout data is owned by the containing block

Arguments

• layout_index - The index of the layout node in the tree

Returns

The inline layout for the node’s IFC, or None if no layout is available

Trait Implementations

impl Clone for LayoutTree

fn clone(&self) -> LayoutTree

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for LayoutTree

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

Formats the value using the given formatter.