MaterialStateColor typedef

  1. @Deprecated('Use WidgetStateColor instead. ' 'Moved to the Widgets layer to make code available outside of Material. ' 'This feature was deprecated after v3.19.0-0.3.pre.')
MaterialStateColor = WidgetStateColor

Defines a Color that is also a MaterialStateProperty.

This class exists to enable widgets with Color valued properties to also accept MaterialStateProperty<Color> values. A material state color property represents a color 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.

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

To use a MaterialStateColor, you can either:

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

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

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

This example defines a MaterialStateColor with a const constructor.
link
class MyColor extends MaterialStateColor {
  const MyColor() : super(_defaultColor);

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

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

See also

  • WidgetStateColor, the non-Material version that can be used interchangeably with MaterialStateColor.

Implementation

@Deprecated(
  'Use WidgetStateColor instead. '
  'Moved to the Widgets layer to make code available outside of Material. '
  'This feature was deprecated after v3.19.0-0.3.pre.'
)
typedef MaterialStateColor = WidgetStateColor;