Switching questions: fix problem (#259)

Author: damir-abdulin

admin/lib/presentation/pages/builder/builder_page.dart

@@ -30,10 +30,16 @@ class _BuilderPageState extends State<BuilderPage> {
   }
 
   void _onChangePage() {
+    final questions = _cubit.state.surveyData.questions;
     final index = _surveyController.pageController.page;
+    final question = index == questions.length
+        ? _cubit.state.surveyData.endPage
+        : index != null && index % 1 == 0
+            ? questions[index.toInt()]
+            : null;
 
-    if (index != null && index % 1 == 0) {
-      _cubit.select(_cubit.state.surveyData.questions[index.toInt()]);
+    if (question != null) {
+      _cubit.select(question);
     }
   }
 

admin/lib/presentation/widgets/builder_page/editor_bar.dart

@@ -44,21 +44,25 @@ class EditorBar extends StatelessWidget {
               switch (questionData.type) {
                 case QuestionTypes.choice:
                   return ChoiceCustomizationPanel(
+                    key: UniqueKey(),
                     onChange: onChange,
                     editable: questionData as ChoiceQuestionData,
                   );
                 case QuestionTypes.input:
                   return InputCustomizationPanel(
+                    key: UniqueKey(),
                     onChange: onChange,
                     editable: questionData as InputQuestionData,
                   );
                 case QuestionTypes.info:
                   return InfoCustomizationPanel(
+                    key: UniqueKey(),
                     onChange: onChange,
                     editable: questionData as InfoQuestionData,
                   );
                 case QuestionTypes.slider:
                   return SliderCustomizationPanel(
+                    key: UniqueKey(),
                     onChange: onChange,
                     editable: questionData as SliderQuestionData,
                   );

admin/lib/presentation/widgets/builder_page/question_list.dart

@@ -44,18 +44,15 @@ class _QuestionListState extends State<QuestionList> {
         ? widget.questions.length - 1
         : newIndex;
 
-    final itemOld = widget.questions.removeAt(oldIndex);
-
-    widget.questions.insert(
-      updatedIndex,
-      itemOld,
-    );
+    final questions = List.of(widget.questions);
+    final itemOld = questions.removeAt(oldIndex);
+    questions.insert(updatedIndex, itemOld);
 
     for (var i = 0; i < widget.questions.length; i++) {
-      widget.questions[i] = widget.questions[i].copyWith(index: i + 1);
+      questions[i] = questions[i].copyWith(index: i + 1);
     }
 
-    widget.onUpdate(widget.questions);
+    widget.onUpdate(questions);
   }
 
   @override