Struct LayoutContext 

pub struct LayoutContext { /* private fields */ }

A per-surface layout tree: the taffy engine plus the node→rect-signal registry. The layout tree is a per-surface world so nodes can be created and laid out from anywhere — including reactive effects (reactive lists) that fire from an effect body. Under M3 several surfaces share one UI thread, so the runner activates each surface’s LayoutContext around its build/event/frame; app code just calls the free functions, which operate on whichever surface is currently active.

Implementations

impl LayoutContext

pub fn new() -> Self

Allocates a fresh, inactive per-surface instance.

pub fn enter(&self) -> LayoutGuard

Makes this instance the live one until the returned guard drops, which restores the previously-active instance. Nest by keeping guards in scope; they restore in reverse order.

Trait Implementations

impl Default for LayoutContext

fn default() -> Self

Returns the “default value” for a type.

impl Drop for LayoutContext

fn drop(&mut self)

Executes the destructor for this type.

fn pin_drop(self: Pin<&mut Self>)

🔬This is a nightly-only experimental API. (pin_ergonomics)

Execute the destructor for this type, but different to Drop::drop, it requires self to be pinned.