ThemeEncoder<T extends Object?> class abstract

ThemeEncoder

Implement this class to provide custom encoding for a specific Type It allows for specyfying custom logic for encoding the theme values. T is the type of the encoded data such as "Color" or "TextStyle"

ThemeEncoders can be placed either on a class or a field

If field is annotated with ThemeEncoder this encoder will be used, otherwise encoders from the @TailorMixin(encoders: ...) or annotations below @TailorMixin() annotation will be used. If no matching encoder for the type is found, default one (dynamic) will be used.

Default encoders are implemented for:

• TextStyle, TextStyle?
• Color, Color?
• dynamic

class CustomColorEncoder extends ThemeEncoder<Color> {
  const CustomColorEncoder();

  @override
  Color lerp(Color a, Color b, double t) => t < .5 ? a : b;
}

class CustomTextStyleEncoder extends SimpleEncoder<TextStyle> {
  const CustomTextStyleEncoder();
}

@TailorMixin()
class AppTheme extends ThemeExtension<AppTheme> with _$AppThemeTailorMixin {
  AppTheme({
    required this.background,
    required this.surface,
    required this.someColors,
    required this.h1,
  });

  @CustomColorEncoder()
  final Color background;

  /// This will use the default encoder for Color
  final Color surface;

  /// This will the dynamic encoder since the type of the list is dynamic
  final Color someColors;

  @CustomTextStyleEncoder()
  final TextStyle h1;
}

Constructors

ThemeEncoder()

const

Properties

hashCode → int

The hash code for this object.

no setter, inherited

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

Methods

lerp(T a, T b, double t) → T

Linearly interpolate between two values. If any of the value is null, resulting encoded value also is null The t argument represents the timeline 0.0: interpolation has not started, returns a; 1.0: interpolation has finished, returns b;

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

toString() → String

A string representation of this object.

inherited

Operators

operator ==(Object other) → bool

The equality operator.

inherited