ColorSwatch<T> constructor

const ColorSwatch<T>(int primary, Map<T, Color> _swatch)

Creates a color that has a small table of related colors called a "swatch".

The primary argument should be the 32 bit ARGB value of one of the values in the swatch, as would be passed to the new Color constructor for that same color, and as is exposed by value. (This is distinct from the specific index of the color in the swatch.)

Implementation 

const ColorSwatch(int primary, this._swatch) : super(primary);