On finish callback

core/example/lib/main.dart

@@ -37,7 +37,10 @@ class MyHomePage extends StatelessWidget {
       ),
       // Add Survey to your widget tree with filePath parameter that accepts
       // a json file with parsed survey data
-      body: const Survey(filePath: 'assets/questions.json'),
+      body: const Survey(
+        filePath: 'assets/questions.json',
+        onFinish: print,
+      ),
     );
   }
 }

core/lib/src/presentation/survey/survey.dart

@@ -12,6 +12,7 @@ import 'package:survey_sdk/src/presentation/survey/survey_cubit.dart';
 import 'package:survey_sdk/src/presentation/survey/survey_state.dart';
 import 'package:survey_sdk/src/presentation/survey_error/survey_error.dart';
 import 'package:survey_sdk/src/presentation/utils/callback_type.dart';
+import 'package:survey_sdk/src/presentation/utils/on_finish_callback.dart';
 import 'package:survey_sdk/src/presentation/utils/utils.dart';
 
 // TODO(dev): Maybe create two classes, where one is for filePath and the other
@@ -44,13 +45,17 @@ class Survey extends StatefulWidget {
   /// Whether the survey should save user selected answers.
   final bool saveAnswer;
 
+  /// Called after the survey is finished.
+  final OnFinishCallback? onFinish;
+
   /// Either [filePath] or [surveyData] must pe provided. The [controller]
   /// parameter is optional and can be used to provide a custom survey
   /// controller.
   const Survey({
     this.filePath,
     this.surveyData,
     this.controller,
+    this.onFinish,
     this.saveAnswer = true,
     super.key,
   }) : assert(
@@ -107,6 +112,7 @@ class _SurveyState extends State<Survey> {
       index,
       answer,
       callbackType,
+      onFinish: widget.onFinish,
       saveAnswer: widget.saveAnswer,
     );
   }
@@ -177,9 +183,6 @@ class _SurveyState extends State<Survey> {
                       onGoNext: _surveyController.onNext,
                     ),
                   ),
-                  DataToWidgetUtil.createEndPage(
-                    data: data.endPage,
-                  ),
                 ],
               ),
             ),

core/lib/src/presentation/survey/survey_cubit.dart

@@ -2,6 +2,7 @@ import 'package:flutter_bloc/flutter_bloc.dart';
 import 'package:survey_sdk/src/domain/entities/question_answer.dart';
 import 'package:survey_sdk/src/domain/repository_interfaces/survey_data_repository.dart';
 import 'package:survey_sdk/src/presentation/survey/survey_state.dart';
+import 'package:survey_sdk/src/presentation/utils/on_finish_callback.dart';
 import 'package:survey_sdk/src/presentation/utils/survey_button_callback.dart';
 
 import 'package:survey_sdk/survey_sdk.dart';
@@ -29,6 +30,7 @@ class SurveyCubit extends Cubit<SurveyState> {
     QuestionAnswer? answer,
     CallbackType callbackType, {
     required bool saveAnswer,
+    OnFinishCallback? onFinish,
   }) {
     if (state is SurveyLoadedState) {
       final loadedState = state as SurveyLoadedState;
@@ -41,10 +43,16 @@ class SurveyCubit extends Cubit<SurveyState> {
         callback: callback,
         callbackType: callbackType,
         surveyController: surveyController,
+        onFinish: onFinish,
+        answers: loadedState.answers,
         questions: loadedState.surveyData.questions,
         saveAnswer: () => answer == null || !saveAnswer
             ? null
-            : _saveAnswer(index: questionIndex, answer: answer),
+            : _saveAnswer(
+                index: questionIndex,
+                answer: answer,
+                onFinish: onFinish,
+              ),
       ).callbackFromType();
     }
   }
@@ -72,11 +80,18 @@ class SurveyCubit extends Cubit<SurveyState> {
   }
 
   /// Saves the provided [answer] for the question at the specified [index].
-  void _saveAnswer({required int index, required QuestionAnswer answer}) {
+  void _saveAnswer({
+    required int index,
+    required QuestionAnswer answer,
+    OnFinishCallback? onFinish,
+  }) {
     final currentState = state;
     if (currentState is SurveyLoadedState) {
       final newAnswers = Map<int, QuestionAnswer>.of(currentState.answers);
       newAnswers[index] = answer;
+      if (index == currentState.surveyData.questions.length) {
+        onFinish?.call(newAnswers);
+      }
       emit(currentState.copyWith(answers: newAnswers));
     }
   }

core/lib/src/presentation/utils/on_finish_callback.dart

@@ -0,0 +1,3 @@
+import 'package:survey_sdk/src/domain/entities/question_answer.dart';
+
+typedef OnFinishCallback = void Function(Map<int, QuestionAnswer> answers);

core/lib/src/presentation/utils/survey_button_callback.dart

@@ -5,24 +5,33 @@ import 'package:survey_sdk/src/domain/entities/actions/go_next_action.dart';
 import 'package:survey_sdk/src/domain/entities/actions/go_to_action.dart';
 import 'package:survey_sdk/src/domain/entities/actions/skip_question_action.dart';
 import 'package:survey_sdk/src/domain/entities/actions/survey_action.dart';
+import 'package:survey_sdk/src/domain/entities/question_answer.dart';
 import 'package:survey_sdk/src/domain/entities/question_types/question_data.dart';
 import 'package:survey_sdk/src/presentation/survey/survey_controller.dart';
 import 'package:survey_sdk/src/presentation/utils/callback_type.dart';
+import 'package:survey_sdk/src/presentation/utils/on_finish_callback.dart';
 
 class SurveyButtonCallback {
   final SurveyAction? callback;
   final VoidCallback? saveAnswer;
   final SurveyController surveyController;
   final List<QuestionData> questions;
+  final OnFinishCallback? onFinish;
   final CallbackType callbackType;
+  final Map<int, QuestionAnswer>? answers;
 
   SurveyButtonCallback({
     required this.callback,
     required this.saveAnswer,
     required this.surveyController,
     required this.questions,
     required this.callbackType,
-  });
+    this.answers,
+    this.onFinish,
+  }) : assert(
+          onFinish != null && answers != null || onFinish == null,
+          'If onFinish != null answers should not be null either',
+        );
 
   void callbackFromType() => switch (callback.runtimeType) {
         GoToAction => goToCallback(),
@@ -33,7 +42,6 @@ class SurveyButtonCallback {
         _ => defaultSurveyCallback(),
       };
 
-
   @visibleForTesting
   void goToCallback() {
     saveAnswer?.call();
@@ -43,6 +51,7 @@ class SurveyButtonCallback {
   @visibleForTesting
   void finishSurveyCallback() {
     saveAnswer?.call();
+    onFinish?.call(answers!);
     surveyController.animateTo(questions.length);
   }