NavigationBarThemeModifier constructor
      const
      NavigationBarThemeModifier({ 
    
- Key? key,
- Widget? child,
- Key? modifierKey,
- required NavigationBarThemeData data,
Creates a navigation rail theme that controls the NavigationBarThemeData properties for a NavigationBar.
The data argument must not be null.
Implementation
const NavigationBarThemeModifier({
  super.key,
  super.child,
  super.modifierKey,
  required this.data,
});