animated_value #

The animated_value package provides a simple and flexible way to animate values in Flutter. It uses a custom lerp (linear interpolation) function or a custom builder function to create smooth animations with ease.

It's all implicit! Just change the value like you would do in an AnimatedContainer.

Usage #

Here's a basic example of how to use the AnimatedValue widget to animate a ButtonStyle:

  AnimatedValue<ButtonStyle?>(
    // the value to animate
    value: condition ? buttonStyle1 : buttonStyle2,

    // optional `lerp()` for complex objects
    lerp: ButtonStyle.lerp,

    // rebuilds on animation
    builder: (context, value, _) {
      return ElevatedButton(
        style: value,
        child: Text('easy animated style!'),
      );
    },
  )

Custom Interpolation with LerpTween and LerpCallback #

animated_value provides the LerpTween class and LerpCallback type for custom interpolation between two values. Here's a brief explanation and usage example:

final tween = LerpTween(
    begin: ...,
    end: ...,
    lerp: AppBarTheme.lerp,
);

Extension Methods #

The animated_value package also provides extension methods for the LerpCallback class, allowing for easier creation of LerpTween objects. Here's an example of how you can use these extension methods:

final tween = AppBarTheme.lerp.tween(begin: ..., end: ...);