effective static method

FlexSchemeColor effective(FlexSchemeColor colors, int usedColors, { bool swapColors = false, })

Make effective FlexSchemeColor colors using 1...4 of the passed in colors based on the usedColors property.

The usedColors value corresponds to:

• 1: Use only primary color in colors, and compute primaryVariant, secondary and secondaryVariant for returned FlexSchemeColor.
• 2: Use primary and secondary in colors and compute primaryVariant and secondaryVariant for returned FlexSchemeColor.
• 3: Use primary, secondary and primaryVariant in colors and compute and secondaryVariant for returned FlexSchemeColor.
• 4: Use all 4 colors in passed in FlexColorsScheme as they are.

If swapColors is true, primary and secondary, as well as primaryVariant and secondaryVariant are swapped, before being usage limited by usedColors.

Implementation

static FlexSchemeColor effective(FlexSchemeColor colors, int usedColors,
    {bool swapColors = false}) {
  assert(usedColors >= 1 && usedColors <= 4, 'usedColors must be 1 to 4.');

  final FlexSchemeColor effectiveColors = swapColors
      ? colors.copyWith(
          primary: colors.secondary,
          primaryVariant: colors.secondaryVariant,
          secondary: colors.primary,
          secondaryVariant: colors.primaryVariant,
        )
      : colors;

  return effectiveColors.copyWith(
    primary: effectiveColors.primary,
    primaryVariant: usedColors > 2
        ? effectiveColors.primaryVariant
        // ignore: avoid_redundant_argument_values
        : effectiveColors.primary.darken(kDarkenPrimaryVariant),
    secondary: usedColors > 1
        ? effectiveColors.secondary
        : effectiveColors.primary.darken(kDarkenSecondary),
    secondaryVariant: usedColors > 3
        ? effectiveColors.secondaryVariant
        : usedColors > 1
            // ignore: avoid_redundant_argument_values
            ? effectiveColors.secondary
                .darken(kDarkenSecondaryVariantFromSecondary)
            : effectiveColors.primary.darken(kDarkenSecondaryVariant),
    appBarColor: colors.appBarColor,
    error: colors.error,
  );
}