ColorUtils class abstract final

Color manipulation and accessibility helpers.

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

blend(Color a, Color b, double t) → Color

Linearly interpolates between a and b at t (clamped to 0–1).

contrastFor(Color background) → Color

Returns black or white depending on which contrasts best with background.

contrastRatio(Color a, Color b) → double

The WCAG contrast ratio between a and b (1–21).

darken(Color color, double amount) → Color

Mixes color towards black by amount (0–1).

fromHex(String hex) → Color?

Parses a hex string (#RGB, #RRGGBB, #AARRGGBB, with or without #) into a Color. Returns null when the input is not valid.

isDark(Color color) → bool

Whether color is perceived as dark.

isLight(Color color) → bool

Whether color is perceived as light.

isReadable(Color fg, Color bg, {bool largeText = false}) → bool

Whether fg on bg meets the WCAG AA contrast for normal text (4.5:1).

lighten(Color color, double amount) → Color

Mixes color towards white by amount (0–1).

luminance(Color color) → double

The relative luminance of color (0–1, WCAG definition).

pow2(double value) → double

toHex(Color color, {bool withAlpha = true}) → String

Converts color to a hex string like #FF4F46E5.