onAccent method
Color on top of the accent.
Implementation
Color onAccent(BuildContext context) {
if (onAccentColor != null) return onAccentColor!;
if (accentColor == null) return Theme.of(context).colorScheme.onPrimary;
return ThemeData.estimateBrightnessForColor(accentColor!) == Brightness.dark ? const Color(0xFFFFFFFF) : const Color(0xFF000000);
}