Null safety

lib/ui/app/entities/entity_list_tile.dart

@@ -34,7 +34,8 @@ class EntityListTile extends StatefulWidget {
   final BaseEntity? entity;
   final bool isFilter;
   final ClientEntity? client;
-  final Function(BuildContext, BaseEntity?, EntityAction)? onEntityActionSelected;
+  final Function(BuildContext, BaseEntity?, EntityAction)?
+      onEntityActionSelected;
 
   @override
   _EntityListTileState createState() => _EntityListTileState();
@@ -64,8 +65,9 @@ class _EntityListTileState extends State<EntityListTile> {
             _isHovered;
 
     final leading = ActionMenuButton(
-      iconData:
+      iconData: isHovered
-          isHovered ? Icons.more_vert : getEntityIcon(widget.entity!.entityType),
+          ? Icons.more_vert
+          : getEntityIcon(widget.entity!.entityType),
       iconSize: isHovered ? null : 18,
       entityActions: widget.entity!.getActions(
           userCompany: state.userCompany,
@@ -146,7 +148,7 @@ class _EntityListTileState extends State<EntityListTile> {
               onLongPress: () =>
                   inspectEntity(entity: widget.entity, longPress: true),
               title: Text(
-                EntityPresenter().initialize(widget.entity, context).title()!,
+                EntityPresenter().initialize(widget.entity!, context).title()!,
                 maxLines: 1,
                 overflow: TextOverflow.ellipsis,
               ),
@@ -166,8 +168,8 @@ class _EntityListTileState extends State<EntityListTile> {
                   : null,
               leading: leading,
               trailing: trailing,
-              isThreeLine:
+              isThreeLine: (widget.subtitle ?? '').isNotEmpty &&
-                  (widget.subtitle ?? '').isNotEmpty && !widget.entity!.isActive,
+                  !widget.entity!.isActive,
             ),
           ),
           ListDivider(),

lib/ui/app/entity_top_filter.dart

@@ -115,7 +115,8 @@ class EntityTopFilter extends StatelessWidget {
                                   constraints: BoxConstraints(maxWidth: 220),
                                   child: Text(
                                     EntityPresenter()
-                                        .initialize(filterEntity as BaseEntity?, context)
+                                        .initialize(
+                                            filterEntity as BaseEntity, context)
                                         .title()!,
                                     style: TextStyle(
                                         fontSize: 17,
@@ -153,7 +154,8 @@ class EntityTopFilter extends StatelessWidget {
                                       onPressed: () {
                                         viewEntitiesByType(
                                           entityType: relatedTypes[i],
-                                          filterEntity: filterEntity as BaseEntity?,
+                                          filterEntity:
+                                              filterEntity as BaseEntity?,
                                         );
                                       },
                                       onLongPress: () {
@@ -206,7 +208,8 @@ class EntityTopFilter extends StatelessWidget {
                                     } else {
                                       viewEntitiesByType(
                                         entityType: value,
-                                        filterEntity: filterEntity as BaseEntity?,
+                                        filterEntity:
+                                            filterEntity as BaseEntity?,
                                       );
                                     }
                                   },

lib/ui/app/invoice/tax_rate_dropdown.dart

@@ -91,7 +91,7 @@ class _TaxRateDropdownState extends State<TaxRateDropdown> {
             value: taxRate,
             isExpanded: true,
             isDense: true,
-            onChanged: widget.onSelected,
+            onChanged: (rate) => widget.onSelected(rate!),
             items: [
               if (!taxRate.isEmpty)
                 DropdownMenuItem(

lib/ui/app/presenters/entity_presenter.dart

@@ -12,7 +12,10 @@ import 'package:invoiceninja_flutter/utils/formatting.dart';
 import 'package:invoiceninja_flutter/utils/localization.dart';
 
 class EntityPresenter {
-  EntityPresenter initialize(BaseEntity? entity, BuildContext context) {
+  EntityPresenter initialize(
+    BaseEntity entity,
+    BuildContext context,
+  ) {
     this.entity = entity;
     this.context = context;
 

lib/ui/app/tables/entity_datatable.dart

@@ -54,7 +54,7 @@ class EntityDataTableSource extends AppDataTableSource {
   DataRow getRow(int index) {
     final state = StoreProvider.of<AppState>(context).state;
     final prefState = state.prefState;
-    final entity = entityMap![entityList[index]];
+    final entity = entityMap![entityList[index]]!;
     entityPresenter!.initialize(entity, context);
 
     final listState = state.getListState(entityType);

lib/ui/app/view_scaffold.dart

@@ -30,7 +30,7 @@ class ViewScaffold extends StatelessWidget {
   });
 
   final bool isFilter;
-  final BaseEntity? entity;
+  final BaseEntity entity;
   final Widget body;
   final Function? onBackPressed;
   final Widget? appBarBottom;
@@ -105,7 +105,7 @@ class ViewScaffold extends StatelessWidget {
               child: Text(appBarTitle!),
             ),
             bottom: appBarBottom as PreferredSizeWidget?,
-            actions: entity!.isNew
+            actions: entity.isNew
                 ? []
                 : [
                     if (isSettings && isDesktop(context) && !isFilter)

lib/ui/company_gateway/edit/company_gateway_edit_vm.dart

@@ -101,8 +101,10 @@ class CompanyGatewayEditVM {
                 store.dispatch(SaveCompanyRequest(
                     completer: Completer<Null>(),
                     company: company.rebuild((b) => b
-                      ..settings.companyGatewayIds +=
+                      ..settings.companyGatewayIds =
-                          ',' + savedCompanyGateway.id)));
+                          company.settings.companyGatewayIds! +
+                              ',' +
+                              savedCompanyGateway.id)));
               }
 
               if (state.prefState.isMobile) {

lib/ui/credit/edit/credit_edit_details_vm.dart

@@ -57,8 +57,8 @@ class CreditEditDetailsVM extends EntityEditDetailsVM {
     CompanyEntity? company,
     InvoiceEntity? invoice,
     Function(InvoiceEntity)? onChanged,
-    Function(BuildContext, InvoiceEntity, ClientEntity)? onClientChanged,
+    Function(BuildContext, InvoiceEntity, ClientEntity?)? onClientChanged,
-    Function(BuildContext, InvoiceEntity, VendorEntity)? onVendorChanged,
+    Function(BuildContext, InvoiceEntity, VendorEntity?)? onVendorChanged,
     BuiltMap<String?, ClientEntity?>? clientMap,
     BuiltList<String>? clientList,
     Function(BuildContext context, Completer<SelectableEntity> completer)?
@@ -91,7 +91,9 @@ class CreditEditDetailsVM extends EntityEditDetailsVM {
       clientMap: state.clientState.map,
       clientList: state.clientState.list,
       onClientChanged: (context, credit, client) {
-        store.dispatch(UpdateCredit(credit.applyClient(state, client)));
+        if (client != null) {
+          store.dispatch(UpdateCredit(credit.applyClient(state, client)));
+        }
         store.dispatch(UpdateCreditClient(client: client));
       },
       onAddClientPressed: (context, completer) {

lib/ui/credit/edit/credit_edit_vm.dart

@@ -52,8 +52,8 @@ class CreditEditVM extends AbstractInvoiceEditVM {
     InvoiceEntity? invoice,
     int? invoiceItemIndex,
     InvoiceEntity? origInvoice,
-    Function(BuildContext, [EntityAction])? onSavePressed,
+    Function(BuildContext, [EntityAction?])? onSavePressed,
-    Function(List<InvoiceItemEntity>, String, String)? onItemsAdded,
+    Function(List<InvoiceItemEntity>, String?, String?)? onItemsAdded,
     bool? isSaving,
     Function(BuildContext)? onCancelPressed,
     Function(BuildContext, List<MultipartFile>, bool?)? onUploadDocuments,

lib/ui/expense/view/expense_view_vm.dart

@@ -61,7 +61,7 @@ class AbstractExpenseViewVM {
   });
 
   final AppState? state;
-  final ExpenseEntity? expense;
+  final ExpenseEntity expense;
   final CompanyEntity? company;
   final Function(BuildContext, EntityAction)? onEntityAction;
   final Function(BuildContext)? onRefreshed;
@@ -73,8 +73,8 @@ class AbstractExpenseViewVM {
 
 class ExpenseViewVM extends AbstractExpenseViewVM {
   ExpenseViewVM({
+    required ExpenseEntity expense,
     AppState? state,
-    ExpenseEntity? expense,
     CompanyEntity? company,
     Function(BuildContext, EntityAction)? onEntityAction,
     Function(BuildContext)? onRefreshed,

lib/ui/invoice/edit/invoice_edit_desktop.dart

@@ -330,7 +330,7 @@ class InvoiceEditDesktopState extends State<InvoiceEditDesktop>
                                     EntityPresenter()
                                         .initialize(
                                             invoice.isPurchaseOrder
-                                                ? vendor
+                                                ? vendor!
                                                 : client,
                                             context)
                                         .title()!,

lib/ui/invoice/edit/invoice_edit_items.dart

@@ -46,7 +46,7 @@ class _InvoiceEditItemsState extends State<InvoiceEditItems> {
             viewModel: viewModel,
             entityViewModel: widget.entityViewModel,
             key: ValueKey('__${lineItemIndex}__'),
-            invoiceItem: invoice.lineItems[lineItemIndex!],
+            invoiceItem: invoice.lineItems[lineItemIndex!]!,
             index: lineItemIndex,
           );
         });
@@ -97,8 +97,8 @@ class ItemEditDetails extends StatefulWidget {
     required this.entityViewModel,
   }) : super(key: key);
 
-  final int? index;
+  final int index;
-  final InvoiceItemEntity? invoiceItem;
+  final InvoiceItemEntity invoiceItem;
   final EntityEditItemsVM viewModel;
   final AbstractInvoiceEditVM entityViewModel;
 

lib/ui/invoice/edit/invoice_edit_items_desktop.dart

@@ -1,4 +1,6 @@
 // Flutter imports:
+import 'dart:async';
+
 import 'package:flutter/material.dart';
 
 // Package imports:
@@ -676,8 +678,10 @@ class _InvoiceEditItemsDesktopState extends State<InvoiceEditItemsDesktop> {
                                   return <ProductEntity>[];
                                 }
 
-                                return options as FutureOr<Iterable<ProductEntity>>;
+                                return options
-                              } as FutureOr<Iterable<ProductEntity>> Function(TextEditingValue),
+                                    as FutureOr<Iterable<ProductEntity>>;
+                              } as FutureOr<Iterable<ProductEntity>> Function(
+                                      TextEditingValue),
                               displayStringForOption: (product) =>
                                   product.productKey,
                               onSelected: (product) {
@@ -818,8 +822,8 @@ class _InvoiceEditItemsDesktopState extends State<InvoiceEditItemsDesktop> {
                                                         .cardColor,
                                                 child:
                                                     EntityAutocompleteListTile(
-                                                  onTap: (entity) =>
+                                                  onTap: (entity) => onSelected(
-                                                      onSelected(entity as ProductEntity),
+                                                      entity as ProductEntity),
                                                   overrideSuggestedAmount:
                                                       (entity) {
                                                     final product =
@@ -1162,6 +1166,8 @@ class _InvoiceEditItemsDesktopState extends State<InvoiceEditItemsDesktop> {
                             ),
                           ),
                         );
+                      } else {
+                        return SizedBox();
                       }
                     }).toList(),
                     Padding(

lib/ui/invoice/edit/invoice_edit_vm.dart

@@ -78,8 +78,8 @@ class InvoiceEditVM extends AbstractInvoiceEditVM {
     InvoiceEntity? invoice,
     int? invoiceItemIndex,
     InvoiceEntity? origInvoice,
-    Function(BuildContext, [EntityAction])? onSavePressed,
+    Function(BuildContext, [EntityAction?])? onSavePressed,
-    Function(List<InvoiceItemEntity>, String, String)? onItemsAdded,
+    Function(List<InvoiceItemEntity>, String?, String?)? onItemsAdded,
     bool? isSaving,
     Function(BuildContext)? onCancelPressed,
     Function(BuildContext, List<MultipartFile>, bool?)? onUploadDocuments,
@@ -202,7 +202,7 @@ class InvoiceEditVM extends AbstractInvoiceEditVM {
       },
       onItemsAdded: (items, clientId, projectId) {
         if ((clientId ?? '').isNotEmpty || (projectId ?? '').isNotEmpty) {
-          final client = state.clientState.get(clientId);
+          final client = state.clientState.get(clientId!);
           store.dispatch(UpdateInvoice(invoice.rebuild((b) => b
             ..clientId = clientId ?? ''
             ..projectId = projectId ?? ''

lib/ui/invoice/invoice_email_vm.dart

@@ -1,4 +1,6 @@
 // Flutter imports:
+import 'dart:async';
+
 import 'package:flutter/material.dart';
 
 // Package imports:
@@ -111,7 +113,7 @@ class EmailInvoiceVM extends EmailEntityVM {
             context, AppLocalization.of(context)!.emailedInvoice,
             shouldPop: isMobile(context));
         if (!isMobile(context)) {
-          completer.future.then((value) {
+          completer.future.then<Null>(() {
             viewEntity(entity: invoice);
           } as FutureOr<Null> Function(Null));
         }

lib/ui/project/view/project_view_vm.dart

@@ -85,8 +85,8 @@ class ProjectViewVM {
       client: client,
       onRefreshed: (context) => _handleRefresh(context),
       onEntityPressed: (BuildContext context, EntityType entityType,
-          {bool longPress = false}) {
+          {bool? longPress = false}) {
-        if (longPress && project.isActive && client.isActive) {
+        if (longPress == true && project.isActive && client.isActive) {
           handleProjectAction(
               context, [project], EntityAction.newEntityType(entityType));
         } else {

lib/ui/purchase_order/edit/purchase_order_edit_vm.dart

@@ -52,8 +52,8 @@ class PurchaseOrderEditVM extends AbstractInvoiceEditVM {
     InvoiceEntity? purchaseOrder,
     int? invoiceItemIndex,
     InvoiceEntity? origInvoice,
-    Function(BuildContext, [EntityAction])? onSavePressed,
+    Function(BuildContext, [EntityAction?])? onSavePressed,
-    Function(List<InvoiceItemEntity>, String, String)? onItemsAdded,
+    Function(List<InvoiceItemEntity>, String?, String?)? onItemsAdded,
     bool? isSaving,
     Function(BuildContext)? onCancelPressed,
     Function(BuildContext, List<MultipartFile>, bool?)? onUploadDocuments,
@@ -116,7 +116,8 @@ class PurchaseOrderEditVM extends AbstractInvoiceEditVM {
                 store.dispatch(
                     UpdateCurrentRoute(PurchaseOrderViewScreen.route));
                 if (purchaseOrder.isNew) {
-                  navigator!.pushReplacementNamed(PurchaseOrderViewScreen.route);
+                  navigator!
+                      .pushReplacementNamed(PurchaseOrderViewScreen.route);
                 } else {
                   navigator!.pop(savedPurchaseOrder);
                 }

lib/ui/quote/edit/quote_edit_details_vm.dart

@@ -90,7 +90,9 @@ class QuoteEditDetailsVM extends EntityEditDetailsVM {
       clientMap: state.clientState.map,
       clientList: state.clientState.list,
       onClientChanged: (context, quote, client) {
-        store.dispatch(UpdateQuote(quote.applyClient(state, client)));
+        if (client != null) {
+          store.dispatch(UpdateQuote(quote.applyClient(state, client)));
+        }
         store.dispatch(UpdateQuoteClient(client: client));
       },
       onAddClientPressed: (context, completer) {

lib/ui/quote/edit/quote_edit_vm.dart

@@ -52,8 +52,8 @@ class QuoteEditVM extends AbstractInvoiceEditVM {
     InvoiceEntity? invoice,
     int? invoiceItemIndex,
     InvoiceEntity? origInvoice,
-    Function(BuildContext, [EntityAction])? onSavePressed,
+    Function(BuildContext, [EntityAction?])? onSavePressed,
-    Function(List<InvoiceItemEntity>, String, String)? onItemsAdded,
+    Function(List<InvoiceItemEntity>, String?, String?)? onItemsAdded,
     bool? isSaving,
     Function(BuildContext)? onCancelPressed,
     Function(BuildContext, List<MultipartFile>, bool?)? onUploadDocument,

lib/ui/recurring_expense/edit/recurring_expense_edit_vm.dart

@@ -93,7 +93,7 @@ class RecurringExpenseEditVM extends AbstractExpenseEditVM {
               ..future.then<Null>(() {
                 store.dispatch(
                     UpdateCurrentRoute(RecurringExpenseEditScreen.route));
-              } as FutureOr<_> Function(Null)));
+              } as FutureOr<Null> Function(Null)));
         completer.future.then((SelectableEntity client) {
           store.dispatch(UpdateCurrentRoute(RecurringExpenseEditScreen.route));
         });

lib/ui/recurring_expense/view/recurring_expense_view_vm.dart

@@ -49,8 +49,8 @@ class RecurringExpenseViewScreen extends StatelessWidget {
 
 class RecurringExpenseViewVM extends AbstractExpenseViewVM {
   RecurringExpenseViewVM({
+    required ExpenseEntity expense,
     AppState? state,
-    ExpenseEntity? expense,
     CompanyEntity? company,
     Function(BuildContext, EntityAction)? onEntityAction,
     Function(BuildContext)? onRefreshed,

lib/ui/recurring_invoice/edit/recurring_invoice_edit_details_vm.dart

@@ -92,8 +92,10 @@ class RecurringInvoiceEditDetailsVM extends EntityEditDetailsVM {
       clientMap: state.clientState.map,
       clientList: state.clientState.list,
       onClientChanged: (context, invoice, client) {
-        store.dispatch(
+        if (client != null) {
-            UpdateRecurringInvoice(invoice.applyClient(state, client)));
+          store.dispatch(
+              UpdateRecurringInvoice(invoice.applyClient(state, client)));
+        }
         store.dispatch(UpdateRecurringInvoiceClient(client: client));
       },
       onAddClientPressed: (context, completer) {

lib/ui/recurring_invoice/edit/recurring_invoice_edit_vm.dart

@@ -53,7 +53,7 @@ class RecurringInvoiceEditVM extends AbstractInvoiceEditVM {
     int? invoiceItemIndex,
     InvoiceEntity? origInvoice,
     Function(BuildContext, [EntityAction?])? onSavePressed,
-    Function(List<InvoiceItemEntity>, String, String)? onItemsAdded,
+    Function(List<InvoiceItemEntity>, String?, String?)? onItemsAdded,
     bool? isSaving,
     Function(BuildContext)? onCancelPressed,
     Function(BuildContext, List<MultipartFile>, bool)? onUploadDocuments,

lib/ui/reports/document_report.dart

@@ -46,7 +46,7 @@ ReportResult documentReport(
   BuiltMap<String?, UserEntity?> userMap,
 ) {
   final List<List<ReportElement>> data = [];
-  final List<BaseEntity?> entities = [];
+  final List<BaseEntity> entities = [];
   BuiltList<DocumentReportFields> columns;
 
   final localization =
@@ -144,13 +144,13 @@ ReportResult documentReport(
 
     if (!skip) {
       data.add(row);
-      entities.add(document);
+      entities.add(document!);
     }
   });
 
   final selectedColumns = columns.map((item) => EnumUtils.parse(item)).toList();
-  data.sort((rowA, rowB) =>
+  data.sort((rowA, rowB) => sortReportTableRows(
-      sortReportTableRows(rowA, rowB, documentReportSettings, selectedColumns)!);
+      rowA, rowB, documentReportSettings, selectedColumns)!);
 
   return ReportResult(
     allColumns:

lib/ui/reports/report_charts.dart

@@ -1,4 +1,5 @@
 // Flutter imports:
+import 'package:charts_flutter/flutter.dart';
 import 'package:flutter/material.dart';
 
 // Package imports:
@@ -71,8 +72,8 @@ class ReportCharts extends StatelessWidget {
                 data: viewModel.groupTotals.rows!.map((key) {
                   return {
                     'name': key,
-                    'value': viewModel.groupTotals.totals![key]!
+                    'value':
-                        [reportState.chart]
+                        viewModel.groupTotals.totals![key]![reportState.chart]
                   };
                 }).toList()) as Series<dynamic, String>
           ],
@@ -98,8 +99,8 @@ class ReportCharts extends StatelessWidget {
                 data: keys.map((key) {
                   return {
                     'name': key,
-                    'value': viewModel.groupTotals.totals![key]!
+                    'value':
-                        [reportState.chart]
+                        viewModel.groupTotals.totals![key]![reportState.chart]
                   };
                 }).toList()) as Series<dynamic, DateTime>
           ],

lib/ui/reports/reports_screen.dart

@@ -1,4 +1,6 @@
 // Flutter imports:
+import 'dart:async';
+
 import 'package:collection/collection.dart' show IterableNullableExtension;
 import 'package:flutter/material.dart' hide DataRow, DataCell, DataColumn;
 import 'package:flutter/material.dart' as mt;
@@ -961,7 +963,7 @@ class ReportResult {
   }
 
   static bool matchDateTime({
-    String? filter,
+    required String filter,
     required String value,
     required UserCompanyEntity userCompany,
     required ReportsUIState reportsUIState,
@@ -1165,7 +1167,7 @@ class ReportResult {
             showBlank: true,
             blankValue: null,
             value: (reportState.filters[column] ?? '').isNotEmpty
-                ? DateRange.valueOf(reportState.filters[column])
+                ? DateRange.valueOf(reportState.filters[column]!)
                 : null,
             onChanged: (dynamic value) {
               if (value == null) {
@@ -1213,7 +1215,7 @@ class ReportResult {
               focusNode: textEditingFocusNodes![column],
               optionsBuilder: (TextEditingValue textEditingValue) {
                 final filter = textEditingValue.text.toLowerCase();
-                final index = columns.indexOf(column);
+                final index = columns.indexOf(column!);
                 final options = data
                     .where((row) =>
                         row[index]
@@ -1327,7 +1329,7 @@ class ReportResult {
       final row = data[index - 1];
       final cells = <DataCell>[];
       for (var j = 0; j < row.length; j++) {
-        final index = columns.indexOf(sorted[j]);
+        final index = columns.indexOf(sorted[j]!);
         final cell = row[index];
         final column = sorted[j];
         cells.add(
@@ -1534,13 +1536,14 @@ class ReportResult {
             totals[currencyId] = {'count': 0};
           }
           if (!countedRow) {
-            totals[currencyId]!['count']++;
+            totals[currencyId]!['count'] = totals[currencyId]!['count']! + 1;
             countedRow = true;
           }
           if (!totals[currencyId]!.containsKey(column)) {
             totals[currencyId]![column] = 0;
           }
-          totals[currencyId]![column] += cell.doubleValue!;
+          totals[currencyId]![column] =
+              totals[currencyId]![column]! + cell.doubleValue!;
         }
       }
     }

lib/ui/transaction/view/transaction_view_vm.dart

@@ -61,7 +61,7 @@ class TransactionViewVM {
       transactionIds = [state.transactionUIState.selectedId];
     }
 
-    transactionIds.forEach((transactionId) {
+    transactionIds.forEach((String transactionId) {
       transactions.add(state.transactionState.map[transactionId] ??
           TransactionEntity(id: transactionId));
     } as void Function(String?));
@@ -118,14 +118,14 @@ class TransactionViewVM {
           ConvertTransactionsToExpensesRequest(
             snackBarCompleter<Null>(
                 context, AppLocalization.of(context)!.convertedTransaction)
-              ..future.then((value) {
+              ..future.then<Null>(() {
                 if (state.transactionListState.isInMultiselect()) {
                   store.dispatch(ClearTransactionMultiselect());
                   if (store.state.prefState.isPreviewVisible) {
                     store.dispatch(TogglePreviewSidebar());
                   }
                 }
-              } as FutureOr<_> Function(Null)),
+              } as FutureOr<Null> Function(Null)),
             transactionIds,
             vendorId,
             categoryId,

lib/utils/super_editor/super_editor.dart

@@ -502,6 +502,7 @@ class _ExampleEditorState extends State<ExampleEditor> {
             onCutPressed: _cut,
             onCopyPressed: _copy,
             onPastePressed: _paste,
+            focalPoint: _overlayController.toolbarTopAnchor!,
           ),
           overlayController: _overlayController,
         ),

lib/utils/web.dart

@@ -84,7 +84,7 @@ class WebUtils {
     final loginRequest = PopupRequest()..scopes = ['user.read'];
 
     publicClientApp.loginPopup(loginRequest).then((result) {
-      succesCallback(result?.idToken, result?.accessToken);
+      succesCallback(result?.idToken ?? '', result?.accessToken ?? '');
     }).catchError((dynamic error) {
       failureCallback(error);
     });

samples/form_keys.dart

@@ -243,7 +243,7 @@ class ContactForm extends StatefulWidget {
   }) : super(key: key);
 
   final ContactEntity contact;
-  final Function(GlobalKey<ContactFormState>?) onRemovePressed;
+  final Function(GlobalKey<ContactFormState>) onRemovePressed;
 
   @override
   ContactFormState createState() => ContactFormState();
@@ -274,7 +274,8 @@ class ContactFormState extends State<ContactForm> {
             Padding(
               padding: const EdgeInsets.only(top: 12.0),
               child: TextButton(
-                onPressed: () => widget.onRemovePressed(widget.key as GlobalKey<ContactFormState>?),
+                onPressed: () => widget
+                    .onRemovePressed(widget.key as GlobalKey<ContactFormState>),
                 child: Text(
                   'Delete',
                   style: TextStyle(