MaterialStateOutlineInputBorder class abstract

Defines a OutlineInputBorder that is also a MaterialStateProperty.

This class exists to enable widgets with OutlineInputBorder valued properties to also accept MaterialStateProperty<OutlineInputBorder> values. A material state input border property represents a text style which depends on a widget's "interactive state". This state is represented as a Set of MaterialStates, like MaterialState.pressed, MaterialState.focused and MaterialState.hovered.

MaterialStateOutlineInputBorder should only be used with widgets that document their support, like InputDecoration.border.

To use a MaterialStateOutlineInputBorder, you can either:

1. Create a subclass of MaterialStateOutlineInputBorder and implement the abstract resolve method.
2. Use MaterialStateOutlineInputBorder.resolveWith and pass in a callback that will be used to resolve the color in the given states.

If a MaterialStateOutlineInputBorder is used for a property or a parameter that doesn't support resolving MaterialStateProperty<OutlineInputBorder>s, then its default color value will be used for all states.

To define a const MaterialStateOutlineInputBorder, you'll need to extend MaterialStateOutlineInputBorder and override its resolve method. You'll also need to provide a defaultValue to the super constructor, so that we can know at compile-time what its default color is.