buildButton method
Implementation
Widget buildButton(String title,{String? value}){
if(value == null){
value = title;
}
return Container(
color: Colors.white,
child: GestureDetector(
behavior: HitTestBehavior.translucent,
child: Center(child: Text(title),),
onTap: (){
controller!.addText(value!);
},
),
);
}