Struct FocusContext 

pub struct FocusContext { /* private fields */ }

Per-surface focus state. The runner activates each surface’s FocusContext around its build/event/frame, so focus never crosses windows.

Implementations

impl FocusContext

pub fn new() -> Self

Allocates a fresh, inactive per-surface instance.

pub fn enter(&self) -> FocusGuard

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.

pub fn enter_ambient() -> FocusGuard

Makes the ambient instance — the one that exists before any surface is built, and the only world a single-surface app ever has — live until the returned guard drops.

What the reactive flush needs for an effect owned by SurfaceHandle::NONE: it was registered outside any surface, so its world is this one, and running it against whichever surface happened to be entered when the signal fired would resolve its layout, overlays and focus in somebody else’s. Reachable as soon as one app has both — a window tree that never built a surface and a second tree that did.

Trait Implementations

impl Default for FocusContext

fn default() -> Self

Returns the “default value” for a type.

impl Drop for FocusContext

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.