Tab constructor Null safety

const Tab(
  1. {Key? key,
  2. String? text,
  3. Widget? icon,
  4. EdgeInsetsGeometry iconMargin = const EdgeInsets.only(bottom: 10.0),
  5. double? height,
  6. Widget? child}
)

Creates a Material Design TabBar tab.

At least one of text, icon, and child must be non-null. The text and child arguments must not be used at the same time. The iconMargin is only useful when icon and either one of text or child is non-null.

Implementation

const Tab({
  super.key,
  this.text,
  this.icon,
  this.iconMargin = const EdgeInsets.only(bottom: 10.0),
  this.height,
  this.child,
}) : assert(text != null || child != null || icon != null),
     assert(text == null || child == null);