UnselfNavigationBar constructor Null safety

const UnselfNavigationBar(
  1. {Key? key,
  2. Widget? leading,
  3. bool automaticallyImplyLeading = true,
  4. bool automaticallyImplyMiddle = true,
  5. String? previousPageTitle,
  6. Widget? middle,
  7. Widget? trailing,
  8. Border? border = _kDefaultNavBarBorder,
  9. Color? backgroundColor,
  10. Brightness? brightness,
  11. EdgeInsetsDirectional? padding,
  12. bool transitionBetweenRoutes = true,
  13. Object heroTag = defaultHeroTag}
)

Implementation

const UnselfNavigationBar({
  Key? key,
  this.leading,
  this.automaticallyImplyLeading = true,
  this.automaticallyImplyMiddle = true,
  this.previousPageTitle,
  this.middle,
  this.trailing,
  this.border = _kDefaultNavBarBorder,
  this.backgroundColor,
  this.brightness,
  this.padding,
  this.transitionBetweenRoutes = true,
  this.heroTag = defaultHeroTag,
})  : assert(
        !transitionBetweenRoutes || identical(heroTag, defaultHeroTag),
        'Cannot specify a heroTag override if this navigation bar does not '
        'transition due to transitionBetweenRoutes = false.',
      ),
      super(key: key);