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Forward countersignature radio button

assalamualaikum well in this tutorial we'll  see how to make radio buttons like this and   then we'll also see how to save the value of  the selected button so that you can use it later   we will do that using getx package well to do  this first i have created a controller here and   i call it buttoncontroller.dart and then i have  extended getx controller using this getx package   after this i have created a variable  string variable and the default value is   home delivery because we are going to work on  buttons like this where you can have a different   value for each button and we want to know which  value has been selected or whether the value has   been changed so for us the default value is the  home delivery and we also set a getter for this   and we created a method called set order type  so this is the method that would get called   and because this method would get called so it  will change the value so whatever the value being   selected that would be passed to this parameter  and then we'll save this value in this order   type so later on we can use this order type  this getter to get the or see the value from our   changes or from the button click and of course  this value could be also sent to your server   now we'll go to main.dart and over here we'll  create a stateless class now the class name is   order type button and it's a stateless class and  as you can see it will take four parameters and   we created the constructor so we'll create  two buttons as we create the buttons we'll   send the value and the title among them the  most important is the value this is the value   that we want to toggle and this is the title  so the title will be visible and title and   value of course there could be different now  these two are just for looking nice now here   i do have a build method now inside this build  method will return a get builder so that we can   make reactive buttons a button will be reactive  not only that they'll also preserve value based   on their clicking so now here we are returning  get builder and over here for get builder   the class type is the controller the  controller is this one so over here we'll   creating an instance based on this button so  the controller instance is button controller   and we'll wrap our radio button using inkwell  okay so that's why we have this on tap event   and on the on tab over here we'll call this method  which is called set order type which is this one   so as we call it we'll pass the value so here is  our radio button as you see there would be a value   so whatever the value set here will also set that  value for this radio button and we also...