DialogRoute<T>  constructor 
      
      DialogRoute<T> ({ 
    
    
- required RoutePageBuilder pageBuilder,
 - bool barrierDismissible = true,
 - String? barrierLabel,
 - Color barrierColor = const Color(0x80000000),
 - Duration transitionDuration = const Duration(milliseconds: 200),
 - RouteTransitionsBuilder? transitionBuilder,
 - RouteSettings? settings,
 
Implementation
DialogRoute({
  required RoutePageBuilder pageBuilder,
  bool barrierDismissible = true,
  String? barrierLabel,
  Color barrierColor = const Color(0x80000000),
  Duration transitionDuration = const Duration(milliseconds: 200),
  RouteTransitionsBuilder? transitionBuilder,
  RouteSettings? settings,
})  : assert(barrierDismissible != null),
      _pageBuilder = pageBuilder,
      _barrierDismissible = barrierDismissible,
      _barrierLabel = barrierLabel,
      _barrierColor = barrierColor,
      _transitionDuration = transitionDuration,
      _transitionBuilder = transitionBuilder,
      super(settings: settings);