BackgroundSpec class final

Background (spec §5.1 Background).

Annotations

• @immutable

Constructors

BackgroundSpec({required BackgroundKind kind, required List<int> colors, int angleTenths = 0, BackgroundPattern pattern = BackgroundPattern.none, int patternColor = 0, int patternScaleCdp = 0, int patternOpacityPermille = 0, int driftPeriodMs = 0})

colors must be unmodifiable (a const literal, or wrapped with List.unmodifiable): specs are deeply immutable and cache their stable hash. The generator, copyWith and fromJson all comply.

const

BackgroundSpec.fromJson(Object? json)

factory

Properties

angleTenths → int

Linear gradient direction, tenths of a degree (0 = top → bottom). Family scenes reuse it as a scene parameter (sphere layout, sun azimuth or holo angle, paper grain strength, gradient tilt, horizon height, poster orientation); same-family transitions lerp it along the shorter arc.

final

base → int

The base colour (first stop).

no setter

colors → List<int>

Solid: one colour. Gradients: stops in order (evenly spaced). Mesh: control colours. Family scenes (claySoft … bauhausComposition): the scene's colour roles by index, documented by the family.

final

driftPeriodMs → int

Slow drift period for animated backgrounds (0 = static). Disabled by Reduce Motion at runtime.

final

hashCode → int

The hash code for this object.

no setter, override

kind → BackgroundKind

final

pattern → BackgroundPattern

final

patternColor → int

Pattern ink (usually translucent).

final

patternOpacityPermille → int

Pattern opacity × 1000.

final

patternScaleCdp → int

Pattern cell size, dp × 100.

final

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

Methods

copyWith({BackgroundKind? kind, List<int>? colors, int? angleTenths, BackgroundPattern? pattern, int? patternColor, int? patternScaleCdp, int? patternOpacityPermille, int? driftPeriodMs}) → BackgroundSpec

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

toJson() → Map<String, Object?>

toString() → String

A string representation of this object.

inherited

Operators

operator ==(Object other) → bool

The equality operator.

override