Enum LifecycleState 

pub enum LifecycleState {
    Active,
    Inactive,
    Background,
    Suspended,
}

The app’s OS-level lifecycle state (D042’s four states).

Mobile semantics (the reason this exists — see .steering/PHASE_29.md): iOS maps applicationDidBecomeActive/WillResignActive/ DidEnterBackground/WillTerminate, Android maps onResume/onPause/onStop (Android has no pre-kill callback, so Suspended is iOS-only in practice). Desktop apps simply stay Active — the default — since no host reports otherwise (desktop lifecycle is explicitly out of Phase 29’s scope).

Variants

Active

Foreground, receiving events. The startup default: by the time any component can observe this atom, the app is running in front.

Inactive

Foreground but not receiving events (iOS: transitional — system dialogs, app switcher, incoming call; Android: onPause).

Background

Not visible; still in memory (iOS: didEnterBackground, Android: onStop). Pause expensive work (animation, polling) here.

Suspended

About to be terminated by the OS (iOS: applicationWillTerminate). Last chance to persist state — there may be no further frames.

Trait Implementations

impl Clone for LifecycleState

fn clone(&self) -> LifecycleState

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for LifecycleState

impl Debug for LifecycleState

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

Formats the value using the given formatter.

impl Default for LifecycleState

fn default() -> LifecycleState

Returns the “default value” for a type.

impl Eq for LifecycleState

impl PartialEq for LifecycleState

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for LifecycleState