onBackground property
Implementation
@override
DynamicColor get onBackground => DynamicColor(
name: "on_background",
palette: (scheme) => scheme.neutralPalette,
tone: (scheme) => scheme.isDark ? 90.0 : 10.0,
background: (_) => background,
contrastCurve: (_) => const ContrastCurve(3.0, 3.0, 4.5, 7.0),
);