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 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 Material Design typography scheme was significantly changed in the current (2018) version of the specification (https://material.io/design/typography).

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 2104 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.

See also:

Mixed in types
Annotations

Constructors

TextTheme({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

bodyText1 TextStyle?
Used for emphasizing text that would otherwise be bodyText2.
final
bodyText2 TextStyle?
The default text style for Material.
final
button TextStyle?
Used for text on ElevatedButton, TextButton and OutlinedButton.
final
caption TextStyle?
Used for auxiliary text associated with images.
final
hashCode int
The hash code for this object. [...]
read-only, override
headline1 TextStyle?
Extremely large text.
final
headline2 TextStyle?
Very, very large text. [...]
final
headline3 TextStyle?
Very large text.
final
headline4 TextStyle?
Large text.
final
headline5 TextStyle?
Used for large text in dialogs (e.g., the month and year in the dialog shown by showDatePicker).
final
headline6 TextStyle?
Used for the primary text in app bars and dialogs (e.g., AppBar.title and AlertDialog.title).
final
overline TextStyle?
The smallest style. [...]
final
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).
final
subtitle2 TextStyle?
For medium emphasis text that's a little smaller than subtitle1.
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? 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. [...]