textStyle property
The style to use for the message of the tooltip.
If null, the message's TextStyle will be determined based on
ThemeData. If ThemeData.brightness is set to Brightness.dark,
TextTheme.bodyText2
of ThemeData.textTheme will be used with
Colors.white. Otherwise, if ThemeData.brightness is set to
Brightness.light, TextTheme.bodyText2
of ThemeData.textTheme will be
used with Colors.black.
Implementation
final TextStyle? textStyle;