apply method

TextTheme apply ({String fontFamily, double fontSizeFactor: 1.0, double fontSizeDelta: 0.0, Color displayColor, Color bodyColor, TextDecoration decoration, Color decorationColor, TextDecorationStyle decorationStyle })

Creates a copy of this text theme but with the given field replaced in each of the individual text styles.

The displayColor is applied to display4, display3, display2, display1, and caption. The bodyColor is applied to the remaining text styles.

Consider using Typography.black or Typography.white, which implement the typography styles in the material design specification, as a starting point.

Implementation 

TextTheme apply({
  String fontFamily,
  double fontSizeFactor = 1.0,
  double fontSizeDelta = 0.0,
  Color displayColor,
  Color bodyColor,
  TextDecoration decoration,
  Color decorationColor,
  TextDecorationStyle decorationStyle,
}) {
  return TextTheme(
    display4: display4?.apply(
      color: displayColor,
      decoration: decoration,
      decorationColor: decorationColor,
      decorationStyle: decorationStyle,
      fontFamily: fontFamily,
      fontSizeFactor: fontSizeFactor,
      fontSizeDelta: fontSizeDelta,
    ),
    display3: display3?.apply(
      color: displayColor,
      decoration: decoration,
      decorationColor: decorationColor,
      decorationStyle: decorationStyle,
      fontFamily: fontFamily,
      fontSizeFactor: fontSizeFactor,
      fontSizeDelta: fontSizeDelta,
    ),
    display2: display2?.apply(
      color: displayColor,
      decoration: decoration,
      decorationColor: decorationColor,
      decorationStyle: decorationStyle,
      fontFamily: fontFamily,
      fontSizeFactor: fontSizeFactor,
      fontSizeDelta: fontSizeDelta,
    ),
    display1: display1?.apply(
      color: displayColor,
      decoration: decoration,
      decorationColor: decorationColor,
      decorationStyle: decorationStyle,
      fontFamily: fontFamily,
      fontSizeFactor: fontSizeFactor,
      fontSizeDelta: fontSizeDelta,
    ),
    headline: headline?.apply(
      color: bodyColor,
      decoration: decoration,
      decorationColor: decorationColor,
      decorationStyle: decorationStyle,
      fontFamily: fontFamily,
      fontSizeFactor: fontSizeFactor,
      fontSizeDelta: fontSizeDelta,
    ),
    title: title?.apply(
      color: bodyColor,
      decoration: decoration,
      decorationColor: decorationColor,
      decorationStyle: decorationStyle,
      fontFamily: fontFamily,
      fontSizeFactor: fontSizeFactor,
      fontSizeDelta: fontSizeDelta,
    ),
    subhead: subhead?.apply(
      color: bodyColor,
      decoration: decoration,
      decorationColor: decorationColor,
      decorationStyle: decorationStyle,
      fontFamily: fontFamily,
      fontSizeFactor: fontSizeFactor,
      fontSizeDelta: fontSizeDelta,
    ),
    body2: body2?.apply(
      color: bodyColor,
      decoration: decoration,
      decorationColor: decorationColor,
      decorationStyle: decorationStyle,
      fontFamily: fontFamily,
      fontSizeFactor: fontSizeFactor,
      fontSizeDelta: fontSizeDelta,
    ),
    body1: body1?.apply(
      color: bodyColor,
      decoration: decoration,
      decorationColor: decorationColor,
      decorationStyle: decorationStyle,
      fontFamily: fontFamily,
      fontSizeFactor: fontSizeFactor,
      fontSizeDelta: fontSizeDelta,
    ),
    caption: caption?.apply(
      color: displayColor,
      decoration: decoration,
      decorationColor: decorationColor,
      decorationStyle: decorationStyle,
      fontFamily: fontFamily,
      fontSizeFactor: fontSizeFactor,
      fontSizeDelta: fontSizeDelta,
    ),
    button: button?.apply(
      color: bodyColor,
      decoration: decoration,
      decorationColor: decorationColor,
      decorationStyle: decorationStyle,
      fontFamily: fontFamily,
      fontSizeFactor: fontSizeFactor,
      fontSizeDelta: fontSizeDelta,
    ),
    subtitle: subtitle?.apply(
      color: bodyColor,
      decoration: decoration,
      decorationColor: decorationColor,
      decorationStyle: decorationStyle,
      fontFamily: fontFamily,
      fontSizeFactor: fontSizeFactor,
      fontSizeDelta: fontSizeDelta,
    ),
    overline: overline?.apply(
      color: bodyColor,
      decoration: decoration,
      decorationColor: decorationColor,
      decorationStyle: decorationStyle,
      fontFamily: fontFamily,
      fontSizeFactor: fontSizeFactor,
      fontSizeDelta: fontSizeDelta,
    ),
  );
}