WidgetStateColor class abstract

Defines a Color that is also a WidgetStateProperty.

This class exists to enable widgets with Color valued properties to also accept WidgetStateProperty<Color> values. A widget state color property represents a color which depends on a widget's "interactive state". This state is represented as a Set of WidgetStates, like WidgetState.pressed, WidgetState.focused and WidgetState.hovered.

WidgetStateColor should only be used with widgets that document their support, like TimePickerThemeData.dayPeriodColor.

To use a WidgetStateColor, you can either:

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

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

To define a const WidgetStateColor, you'll need to extend WidgetStateColor 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.

class MyColor extends WidgetStateColor {
  const MyColor() : super(_defaultColor);

  static const int _defaultColor = 0xcafefeed;
  static const int _pressedColor = 0xdeadbeef;

  @override
  Color resolve(Set<WidgetState> states) {
    if (states.contains(WidgetState.pressed)) {
      return const Color(_pressedColor);
    }
    return const Color(_defaultColor);
  }
}

See also:

• MaterialStateColor, the Material specific version of WidgetStateColor.