Like the image below I want to make an TabBar where there is complete border and when it is selected the borders turns blue if not it remains brown. How do I do it??

CodePudding user response：

set the indicator property, it accepts a BoxDecoration :

TabBar(
// other properties
indicator: BoxDecoration(
 border: Border.all(
 width: 2,
 color: Color.blue
 ))),

this will set a full outlined border indicator for tabs in TabBar