brightness property
The gradient displayed at the appbar.
If this property is null, then ThemeData.appBarTheme.brightness is used,
if that is also null, then ThemeData.brightness is used.
Implementation
final Brightness? brightness;
The gradient displayed at the appbar.
If this property is null, then ThemeData.appBarTheme.brightness is used,
if that is also null, then ThemeData.brightness is used.
final Brightness? brightness;