TextTheme class Null safety

Material design text theme.

Definitions for the various typographical styles found in Material Design (e.g., button, caption). Rather than creating a TextTheme directly, you can obtain an instance as Typography.black or Typography.white.

To obtain the current text theme, call Theme.of with the current BuildContext and read the ThemeData.textTheme property.

The names of the TextTheme properties match this table from the Material Design spec.

The Material Design typography scheme was significantly changed in the current (2021) version of the specification (https://m3.material.io/styles/typography/tokens).

The names of the 2018 TextTheme properties match this table from the Material Design spec with two exceptions: the styles called H1-H6 in the spec are headline1-headline6 in the API, and body1,body2 are called bodyText1 and bodyText2.

The 2018 spec has thirteen text styles:

NAME         SIZE  WEIGHT  SPACING
headline1    96.0  light   -1.5
headline2    60.0  light   -0.5
headline3    48.0  regular  0.0
headline4    34.0  regular  0.25
headline5    24.0  regular  0.0
headline6    20.0  medium   0.15
subtitle1    16.0  regular  0.15
subtitle2    14.0  medium   0.1
body1        16.0  regular  0.5   (bodyText1)
body2        14.0  regular  0.25  (bodyText2)
button       14.0  medium   1.25
caption      12.0  regular  0.4
overline     10.0  regular  1.5

...where "light" is FontWeight.w300, "regular" is FontWeight.w400 and "medium" is FontWeight.w500.

By default, text styles are initialized to match the 2018 Material Design specification as listed above. To provide backwards compatibility, the 2014 specification is also available.

To explicitly configure a Theme for the 2018 sizes, weights, and letter spacings, you can initialize its ThemeData.typography value using Typography.material2018. The Typography constructor defaults to this configuration. To configure a Theme for the 2014 sizes, weights, and letter spacings, initialize its ThemeData.typography value using Typography.material2014.

Constructors

TextTheme({TextStyle? displayLarge, TextStyle? displayMedium, TextStyle? displaySmall, TextStyle? headlineLarge, TextStyle? headlineMedium, TextStyle? headlineSmall, TextStyle? titleLarge, TextStyle? titleMedium, TextStyle? titleSmall, TextStyle? bodyLarge, TextStyle? bodyMedium, TextStyle? bodySmall, TextStyle? labelLarge, TextStyle? labelMedium, TextStyle? labelSmall, TextStyle? headline1, TextStyle? headline2, TextStyle? headline3, TextStyle? headline4, TextStyle? headline5, TextStyle? headline6, TextStyle? subtitle1, TextStyle? subtitle2, TextStyle? bodyText1, TextStyle? bodyText2, TextStyle? caption, TextStyle? button, TextStyle? overline}): Creates a text theme that uses the given values. [...]
const

Properties

bodyLarge → TextStyle?: Largest of the body styles. [...]
final
bodyMedium → TextStyle?: Middle size of the body styles. [...]
final
bodySmall → TextStyle?: Smallest of the body styles. [...]
final
bodyText1 → TextStyle?: Used for emphasizing text that would otherwise be bodyText2.
read-only
bodyText2 → TextStyle?: The default text style for Material.
read-only
button → TextStyle?: Used for text on ElevatedButton, TextButton and OutlinedButton.
read-only
caption → TextStyle?: Used for auxiliary text associated with images.
read-only
displayLarge → TextStyle?: Largest of the display styles. [...]
final
displayMedium → TextStyle?: Middle size of the display styles. [...]
final
displaySmall → TextStyle?: Smallest of the display styles. [...]
final
hashCode → int: The hash code for this object. [...]
read-only, override
headline1 → TextStyle?: Extremely large text.
read-only
headline2 → TextStyle?: Very, very large text. [...]
read-only
headline3 → TextStyle?: Very large text.
read-only
headline4 → TextStyle?: Large text.
read-only
headline5 → TextStyle?: Used for large text in dialogs (e.g., the month and year in the dialog shown by showDatePicker).
read-only
headline6 → TextStyle?: Used for the primary text in app bars and dialogs (e.g., AppBar.title and AlertDialog.title).
read-only
headlineLarge → TextStyle?: Largest of the headline styles. [...]
final
headlineMedium → TextStyle?: Middle size of the headline styles. [...]
final
headlineSmall → TextStyle?: Smallest of the headline styles. [...]
final
labelLarge → TextStyle?: Largest of the label styles. [...]
final
labelMedium → TextStyle?: Middle size of the label styles. [...]
final
labelSmall → TextStyle?: Smallest of the label styles. [...]
final
overline → TextStyle?: The smallest style. [...]
read-only
runtimeType → Type: A representation of the runtime type of the object.
read-only, inherited
subtitle1 → TextStyle?: Used for the primary text in lists (e.g., ListTile.title).
read-only
subtitle2 → TextStyle?: For medium emphasis text that's a little smaller than subtitle1.
read-only
titleLarge → TextStyle?: Largest of the title styles. [...]
final
titleMedium → TextStyle?: Middle size of the title styles. [...]
final
titleSmall → TextStyle?: Smallest of the title styles. [...]
final

Methods

apply({String? fontFamily, double fontSizeFactor = 1.0, double fontSizeDelta = 0.0, Color? displayColor, Color? bodyColor, TextDecoration? decoration, Color? decorationColor, TextDecorationStyle? decorationStyle}) → TextTheme: Creates a copy of this text theme but with the given field replaced in each of the individual text styles. [...]
copyWith({TextStyle? displayLarge, TextStyle? displayMedium, TextStyle? displaySmall, TextStyle? headlineLarge, TextStyle? headlineMedium, TextStyle? headlineSmall, TextStyle? titleLarge, TextStyle? titleMedium, TextStyle? titleSmall, TextStyle? bodyLarge, TextStyle? bodyMedium, TextStyle? bodySmall, TextStyle? labelLarge, TextStyle? labelMedium, TextStyle? labelSmall, TextStyle? headline1, TextStyle? headline2, TextStyle? headline3, TextStyle? headline4, TextStyle? headline5, TextStyle? headline6, TextStyle? subtitle1, TextStyle? subtitle2, TextStyle? bodyText1, TextStyle? bodyText2, TextStyle? caption, TextStyle? button, TextStyle? overline}) → TextTheme: Creates a copy of this text theme but with the given fields replaced with the new values. [...]
debugFillProperties(DiagnosticPropertiesBuilder properties) → void: Add additional properties associated with the node. [...]
override
merge(TextTheme? other) → TextTheme: Creates a new TextTheme where each text style from this object has been merged with the matching text style from the other object. [...]
noSuchMethod(Invocation invocation) → dynamic: Invoked when a non-existent method or property is accessed. [...]
inherited
toDiagnosticsNode({String? name, DiagnosticsTreeStyle? style}) → DiagnosticsNode: Returns a debug representation of the object that is used by debugging tools and by DiagnosticsNode.toStringDeep. [...]
inherited
toString({DiagnosticLevel minLevel = DiagnosticLevel.info}) → String: A string representation of this object. [...]
inherited
toStringShort() → String: A brief description of this object, usually just the runtimeType and the hashCode. [...]
inherited

Operators

operator ==(Object other) → bool: The equality operator. [...]
override

Static Methods

lerp(TextTheme? a, TextTheme? b, double t) → TextTheme: Linearly interpolate between two text themes. [...]

Flutter
material
TextTheme class