Enum LayoutRole 

pub enum LayoutRole {
    None,
    Container(EngineConfig),
    Item(ItemHints),
}

The layout role of a node: container, item, or none (LPAR-10 §5.A).

Registration policy

Specification Required — adding a role variant requires a phase-doc entry citing and updating the §5.A LayoutRole table.

Variants

None

This node has no layout involvement (no layout engine, no computed bounds override).

Container(EngineConfig)

This node runs a layout engine over its children.

Item(ItemHints)

This node is positioned by its parent’s engine.

Trait Implementations

impl Clone for LayoutRole

fn clone(&self) -> LayoutRole

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for LayoutRole

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

Formats the value using the given formatter.

impl Default for LayoutRole

fn default() -> LayoutRole

Returns the “default value” for a type.

impl Eq for LayoutRole

impl PartialEq for LayoutRole

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for LayoutRole