TextTheme class

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 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  normal   0.0
headline4    34.0  normal   0.25
headline5    24.0  normal   0.0
headline6    20.0  medium   0.15
subtitle1    16.0  normal   0.15
subtitle2    14.0  medium   0.1
body1        16.0  normal   0.5
body2        14.0  normal   0.25
button       14.0  medium   0.75
caption      12.0  normal   0.4
overline     10.0  normal   1.5

Where "light" is FontWeight.w300, "normal" is FontWeight.w400 and "medium" is FontWeight.w500.

The TextTheme API is based on the original material (2014) design spec, which used different text style names. For backwards compatibility's sake, this API continues to use the original names. The table below should help with understanding the API in terms of the 2018 material spec.

Each of the TextTheme text styles corresponds to one of the styles from 2018 spec. By default, the font sizes, font weights and letter spacings have not changed from their original, 2014, values.

NAME       SIZE   WEIGHT   SPACING  2018 NAME
display4   112.0  thin     0.0      headline1
display3   56.0   normal   0.0      headline2
display2   45.0   normal   0.0      headline3
display1   34.0   normal   0.0      headline4
headline   24.0   normal   0.0      headline5
title      20.0   medium   0.0      headline6
subhead    16.0   normal   0.0      subtitle1
body2      14.0   medium   0.0      body1
body1      14.0   normal   0.0      body2
caption    12.0   normal   0.0      caption
button     14.0   medium   0.0      button
subtitle   14.0   medium   0.0      subtitle2
overline   10.0   normal   0.0      overline

Where "thin" is FontWeight.w100, "normal" is FontWeight.w400 and "medium" is FontWeight.w500. Letter spacing for all of the original text styles was 0.0.

To configure a Theme for the new sizes, weights, and letter spacings, initialize its ThemeData.typography value with a Typography that object that specifies the 2018 versions of the geometry themes: Typography.englishLike2018, Typography.dense2018, and Typography.tall2018.

The following image from the material design specification shows the recommended styles for each of the properties of a TextTheme. This image uses the Roboto font, which is the font used on Android. On iOS, the San Francisco font is automatically used instead.

To see the image, visit the typography site referenced below.

See also:

Inheritance
Annotations
  • @immutable

Constructors

TextTheme({TextStyle display4, TextStyle display3, TextStyle display2, TextStyle display1, TextStyle headline, TextStyle title, TextStyle subhead, TextStyle body2, TextStyle body1, TextStyle caption, TextStyle button, TextStyle subtitle, TextStyle overline })
Creates a text theme that uses the given values. [...]
const

Properties

body1 TextStyle
Used for the default text style for Material.
final
body2 TextStyle
Used for emphasizing text that would otherwise be body1.
final
button TextStyle
Used for text on RaisedButton and FlatButton.
final
caption TextStyle
Used for auxiliary text associated with images.
final
display1 TextStyle
Large text.
final
display2 TextStyle
Very large text.
final
display3 TextStyle
Very, very large text. [...]
final
display4 TextStyle
Extremely large text. [...]
final
hashCode int
The hash code for this object. [...]
read-only, override
headline TextStyle
Used for large text in dialogs (e.g., the month and year in the dialog shown by showDatePicker).
final
overline TextStyle
The smallest style, [...]
final
subhead TextStyle
Used for the primary text in lists (e.g., ListTile.title).
final
subtitle TextStyle
For medium emphasis text that's a little smaller than subhead.
final
title TextStyle
Used for the primary text in app bars and dialogs (e.g., AppBar.title and AlertDialog.title).
final
runtimeType Type
A representation of the runtime type of the object.
read-only, inherited

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 display4, TextStyle display3, TextStyle display2, TextStyle display1, TextStyle headline, TextStyle title, TextStyle subhead, TextStyle body2, TextStyle body1, TextStyle caption, TextStyle button, TextStyle subtitle, 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.debug }) String
Returns 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 ==(dynamic other) bool
The equality operator. [...]
override

Static Methods

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