FluentShadowLuminosity class abstract final

Fluent's shadow-opacity model.

A fixed shadow reads as a different elevation depending on what it falls on, so Fluent derives opacity from the surface's luminosity. This is why brand shadows are 30%/25% while neutral shadows are 12%/14%.

Properties

hashCode → int

The hash code for this object.

no setter, inherited

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

Methods

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

toString() → String

A string representation of this object.

inherited

Operators

operator ==(Object other) → bool

The equality operator.

inherited

Static Methods

ambientOpacity(Color surface) → double

Ambient ("shadow 1") opacity for a shadow cast on surface, 0–1.

keyOpacity(Color surface) → double

Key ("shadow 2") opacity for a shadow cast on surface, 0–1.

luminosity(Color color) → double

Weighted luminosity of color, 0–255. Note this is the non-linearized form the Fluent docs specify — it is not WCAG relative luminance.

shadowsOn(Color surface, FluentElevation level) → List<BoxShadow>

The full shadow pair for an arbitrary surface color, opacities derived rather than taken from the neutral/brand token pairs.