Refactor/exams page

uni/lib/view/exams/exams.dart

@@ -32,7 +32,7 @@ class ExamsPageViewState extends GeneralPageViewState<ExamsPageView> {
             Column(
               children:
                   createExamsColumn(context, examProvider.getFilteredExams()),
-            )
+            ),
           ],
         );
       },

uni/lib/view/exams/widgets/exam_filter_form.dart

@@ -14,6 +14,12 @@ class ExamFilterForm extends StatefulWidget {
 }
 
 class ExamFilterFormState extends State<ExamFilterForm> {
+  void _changeFilteredExamList(String key, {bool? value}) {
+    setState(() {
+      widget.filteredExamsTypes[key] = value!;
+    });
+  }
+
   @override
   Widget build(BuildContext context) {
     return AlertDialog(
@@ -36,20 +42,34 @@ class ExamFilterFormState extends State<ExamFilterForm> {
                 .setFilteredExams(widget.filteredExamsTypes);
             Navigator.pop(context);
           },
-        )
+        ),
       ],
       content: SizedBox(
         height: 230,
         width: 200,
-        child: getExamCheckboxes(widget.filteredExamsTypes, context),
+        child: FilteredExamList(
+          widget.filteredExamsTypes,
+          _changeFilteredExamList,
+          context,
+        ),
       ),
     );
   }
+}
 
-  Widget getExamCheckboxes(
-    Map<String, bool> filteredExams,
-    BuildContext context,
-  ) {
+class FilteredExamList extends StatelessWidget {
+  const FilteredExamList(
+    this.filteredExams,
+    this.changeFilteredExamList,
+    this.context, {
+    super.key,
+  });
+  final void Function(String, {bool? value}) changeFilteredExamList;
+  final Map<String, bool> filteredExams;
+  final BuildContext context;
+
+  @override
+  Widget build(BuildContext context) {
     filteredExams.removeWhere((key, value) => !Exam.types.containsKey(key));
     return ListView(
       children: List.generate(filteredExams.length, (i) {
@@ -65,11 +85,7 @@ class ExamFilterFormState extends State<ExamFilterForm> {
           ),
           key: Key('ExamCheck$key'),
           value: filteredExams[key],
-          onChanged: (value) {
-            setState(() {
-              filteredExams[key] = value!;
-            });
-          },
+          onChanged: (value) => {changeFilteredExamList(key, value: value)},
         );
       }),
     );