Use Transition

Auto animate transition between new state.

A syntax sugar for handling transition between state automatically.

n.Box()
    ..size = [100, 100]
    ..onPressed = randomizeColor
    ..useTransition<Color>(
        value: color,
        builder: (child, value) => child..bg = value,
    );

Duration and Curve

However, you can also add some customization with Duration and Curve too.

n.Box()
    ..size = [100, 100]
    ..onPressed = randomizeColor
    ..useTransition<Color>(
        value: color,
        builder: (child, value) => child..bg = value,
        // Optional
        duration: Duration(milliseconds: 200),
        // Optional
        curves: Curves.linear,
    );

By default:

• Duration - 200ms
• Curves - Curves.linear