Struct LayoutKnobs 

pub struct LayoutKnobs {
    pub skip: bool,
    pub audit: bool,
    pub retained: bool,
}

The layout-skip and retained-layer knobs a shell resolves once at startup and applies to its RenderRoot (directly, or through crate::AppTree).

Fields

skip: bool

Value for RenderRoot::set_layout_skip (false when NO_LAYOUT_SKIP_VAR is set).

audit: bool

Value for RenderRoot::set_layout_audit (true when LAYOUT_AUDIT_VAR is set non-"0").

retained: bool

Value for RenderRoot::set_retained_layers (false when NO_RETAINED_LAYERS_VAR is set).

Implementations

impl LayoutKnobs

pub fn from_env() -> Self

Resolve the knobs from the compile-time defines and the process environment (the same option_env! + runtime-env shape as the other FRUST_* switches; Android/iOS have no useful runtime env, so the compile-time define is their route).

pub fn resolve( no_skip: KnobSource<'_>, audit: KnobSource<'_>, no_retained: KnobSource<'_>, ) -> Self

The pure resolution Self::from_env wraps, unit-testable without touching the process environment. Each argument names where one knob’s switch variable was found: no_skip (NO_LAYOUT_SKIP_VAR), audit (LAYOUT_AUDIT_VAR) and no_retained (NO_RETAINED_LAYERS_VAR).

pub fn apply_to_app(self, app: &mut dyn AppTree)

Apply to a type-erased app and log one info line.

pub fn log(self)

Log the resolved knobs at info, once.

Trait Implementations

impl Clone for LayoutKnobs

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for LayoutKnobs

impl Debug for LayoutKnobs

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

Formats the value using the given formatter.

impl Eq for LayoutKnobs

impl PartialEq for LayoutKnobs

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for LayoutKnobs