TabBar constructor

const TabBar({Key key, @required List<Widget> tabs, TabController controller, bool isScrollable: false, Color indicatorColor, double indicatorWeight: 2.0, EdgeInsetsGeometry indicatorPadding: EdgeInsets.zero, Decoration indicator, TabBarIndicatorSize indicatorSize, Color labelColor, TextStyle labelStyle, EdgeInsetsGeometry labelPadding, Color unselectedLabelColor, TextStyle unselectedLabelStyle, DragStartBehavior dragStartBehavior: DragStartBehavior.down, ValueChanged<int> onTap })

Creates a material design tab bar.

The tabs argument must not be null and its length must match the controller's TabController.length.

If a TabController is not provided, then there must be a DefaultTabController ancestor.

The indicatorWeight parameter defaults to 2, and must not be null.

The indicatorPadding parameter defaults to EdgeInsets.zero, and must not be null.

If indicator is not null, then indicatorWeight, indicatorPadding, and indicatorColor are ignored.

Implementation

const TabBar({
  Key key,
  @required this.tabs,
  this.controller,
  this.isScrollable = false,
  this.indicatorColor,
  this.indicatorWeight = 2.0,
  this.indicatorPadding = EdgeInsets.zero,
  this.indicator,
  this.indicatorSize,
  this.labelColor,
  this.labelStyle,
  this.labelPadding,
  this.unselectedLabelColor,
  this.unselectedLabelStyle,
  this.dragStartBehavior = DragStartBehavior.down,
  this.onTap,
}) : assert(tabs != null),
     assert(isScrollable != null),
     assert(dragStartBehavior != null),
     assert(indicator != null || (indicatorWeight != null && indicatorWeight > 0.0)),
     assert(indicator != null || (indicatorPadding != null)),
     super(key: key);