TextTheme apply({String fontFamily, double fontSizeFactor: 1.0, double fontSizeDelta: 0.0, Color displayColor, Color bodyColor })

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.

Source 

TextTheme apply({
  String fontFamily,
  double fontSizeFactor: 1.0,
  double fontSizeDelta: 0.0,
  Color displayColor,
  Color bodyColor
}) {
  return new TextTheme(
    display4: display4.apply(
      color: displayColor,
      fontFamily: fontFamily,
      fontSizeFactor: fontSizeFactor,
      fontSizeDelta: fontSizeDelta
    ),
    display3: display3.apply(
      color: displayColor,
      fontFamily: fontFamily,
      fontSizeFactor: fontSizeFactor,
      fontSizeDelta: fontSizeDelta
    ),
    display2: display2.apply(
      color: displayColor,
      fontFamily: fontFamily,
      fontSizeFactor: fontSizeFactor,
      fontSizeDelta: fontSizeDelta
    ),
    display1: display1.apply(
      color: displayColor,
      fontFamily: fontFamily,
      fontSizeFactor: fontSizeFactor,
      fontSizeDelta: fontSizeDelta
    ),
    headline: headline.apply(
      color: bodyColor,
      fontFamily: fontFamily,
      fontSizeFactor: fontSizeFactor,
      fontSizeDelta: fontSizeDelta
    ),
    title: title.apply(
      color: bodyColor,
      fontFamily: fontFamily,
      fontSizeFactor: fontSizeFactor,
      fontSizeDelta: fontSizeDelta
    ),
    subhead: subhead.apply(
      color: bodyColor,
      fontFamily: fontFamily,
      fontSizeFactor: fontSizeFactor,
      fontSizeDelta: fontSizeDelta
    ),
    body2: body2.apply(
      color: bodyColor,
      fontFamily: fontFamily,
      fontSizeFactor: fontSizeFactor,
      fontSizeDelta: fontSizeDelta
    ),
    body1: body1.apply(
      color: bodyColor,
      fontFamily: fontFamily,
      fontSizeFactor: fontSizeFactor,
      fontSizeDelta: fontSizeDelta
    ),
    caption: caption.apply(
      color: displayColor,
      fontFamily: fontFamily,
      fontSizeFactor: fontSizeFactor,
      fontSizeDelta: fontSizeDelta
    ),
    button: button.apply(
      color: bodyColor,
      fontFamily: fontFamily,
      fontSizeFactor: fontSizeFactor,
      fontSizeDelta: fontSizeDelta
    ),
  );
}