Starter...

lib/ui/credit/edit/credit_edit_details_vm.dart

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+import 'dart:async';
+
+import 'package:built_collection/built_collection.dart';
+import 'package:flutter/foundation.dart';
+import 'package:flutter/material.dart';
+import 'package:flutter_redux/flutter_redux.dart';
+import 'package:invoiceninja_flutter/redux/app/app_actions.dart';
+import 'package:invoiceninja_flutter/redux/ui/ui_actions.dart';
+import 'package:invoiceninja_flutter/ui/credit/edit/credit_edit_vm.dart';
+import 'package:invoiceninja_flutter/ui/invoice/edit/invoice_edit_desktop.dart';
+import 'package:invoiceninja_flutter/ui/invoice/edit/invoice_edit_details.dart';
+import 'package:invoiceninja_flutter/ui/invoice/edit/invoice_edit_details_vm.dart';
+import 'package:redux/redux.dart';
+import 'package:invoiceninja_flutter/redux/credit/credit_actions.dart';
+import 'package:invoiceninja_flutter/data/models/models.dart';
+import 'package:invoiceninja_flutter/redux/app/app_state.dart';
+
+class CreditEditDetailsScreen extends StatelessWidget {
+  const CreditEditDetailsScreen({Key key}) : super(key: key);
+
+  @override
+  Widget build(BuildContext context) {
+    return StoreConnector<AppState, CreditEditDetailsVM>(
+      converter: (Store<AppState> store) {
+        return CreditEditDetailsVM.fromStore(store);
+      },
+      builder: (context, viewModel) {
+        if (viewModel.state.prefState.isDesktop) {
+          return InvoiceEditDesktop(
+            viewModel: viewModel,
+            key: ValueKey('__credit_${viewModel.invoice.id}__'),
+            entityType: EntityType.credit,
+          );
+        } else {
+          return InvoiceEditDetails(
+            viewModel: viewModel,
+            entityType: EntityType.credit,
+          );
+        }
+      },
+    );
+  }
+}
+
+class CreditEditDetailsVM extends EntityEditDetailsVM {
+  CreditEditDetailsVM({
+    AppState state,
+    CompanyEntity company,
+    InvoiceEntity invoice,
+    Function(InvoiceEntity) onChanged,
+    Function(InvoiceEntity, ClientEntity) onClientChanged,
+    BuiltMap<String, ClientEntity> clientMap,
+    BuiltList<String> clientList,
+    Function(BuildContext context, Completer<SelectableEntity> completer)
+        onAddClientPressed,
+  }) : super(
+          state: state,
+          company: company,
+          invoice: invoice,
+          onChanged: onChanged,
+          onClientChanged: onClientChanged,
+          clientMap: clientMap,
+          clientList: clientList,
+          onAddClientPressed: onAddClientPressed,
+        );
+
+  factory CreditEditDetailsVM.fromStore(Store<AppState> store) {
+    final AppState state = store.state;
+    final credit = state.creditUIState.editing;
+
+    return CreditEditDetailsVM(
+      state: state,
+      company: state.company,
+      invoice: credit,
+      onChanged: (InvoiceEntity credit) => store.dispatch(UpdateCredit(credit)),
+      clientMap: state.clientState.map,
+      clientList: state.clientState.list,
+      onClientChanged: (invoice, client) {
+        store.dispatch(UpdateCreditClient(client: client));
+      },
+      onAddClientPressed: (context, completer) {
+        createEntity(
+            context: context,
+            entity: ClientEntity(),
+            force: true,
+            completer: completer,
+            cancelCompleter: Completer<Null>()
+              ..future.then((_) {
+                store.dispatch(UpdateCurrentRoute(CreditEditScreen.route));
+              }));
+        completer.future.then((SelectableEntity client) {
+          store.dispatch(UpdateCurrentRoute(CreditEditScreen.route));
+        });
+      },
+    );
+  }
+}

lib/ui/credit/edit/credit_edit_items_vm.dart

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+import 'package:flutter/foundation.dart';
+import 'package:flutter/material.dart';
+import 'package:flutter_redux/flutter_redux.dart';
+import 'package:invoiceninja_flutter/ui/invoice/edit/invoice_edit_items.dart';
+import 'package:invoiceninja_flutter/ui/invoice/edit/invoice_edit_items_desktop.dart';
+import 'package:invoiceninja_flutter/ui/invoice/edit/invoice_edit_items_vm.dart';
+import 'package:redux/redux.dart';
+import 'package:invoiceninja_flutter/redux/credit/credit_actions.dart';
+import 'package:invoiceninja_flutter/data/models/models.dart';
+import 'package:invoiceninja_flutter/redux/app/app_state.dart';
+
+class CreditEditItemsScreen extends StatelessWidget {
+  const CreditEditItemsScreen({
+    Key key,
+  }) : super(key: key);
+
+  @override
+  Widget build(BuildContext context) {
+    return StoreConnector<AppState, CreditEditItemsVM>(
+      converter: (Store<AppState> store) {
+        return CreditEditItemsVM.fromStore(store);
+      },
+      builder: (context, viewModel) {
+        if (viewModel.state.prefState.isDesktop) {
+          return InvoiceEditItemsDesktop(
+            viewModel: viewModel,
+          );
+        } else {
+          return InvoiceEditItems(
+            viewModel: viewModel,
+          );
+        }
+      },
+    );
+  }
+}
+
+class CreditEditItemsVM extends EntityEditItemsVM {
+  CreditEditItemsVM({
+    AppState state,
+    CompanyEntity company,
+    InvoiceEntity invoice,
+    int invoiceItemIndex,
+    Function addLineItem,
+    Function deleteLineItem,
+    Function(int) onRemoveInvoiceItemPressed,
+    Function onDoneInvoiceItemPressed,
+    Function(InvoiceItemEntity, int) onChangedInvoiceItem,
+  }) : super(
+          state: state,
+          company: company,
+          invoice: invoice,
+          addLineItem: addLineItem,
+          deleteLineItem: deleteLineItem,
+          invoiceItemIndex: invoiceItemIndex,
+          onRemoveInvoiceItemPressed: onRemoveInvoiceItemPressed,
+          onDoneInvoiceItemPressed: onDoneInvoiceItemPressed,
+          onChangedInvoiceItem: onChangedInvoiceItem,
+        );
+
+  factory CreditEditItemsVM.fromStore(Store<AppState> store) {
+    final AppState state = store.state;
+    final credit = state.creditUIState.editing;
+
+    return CreditEditItemsVM(
+        state: state,
+        company: state.company,
+        invoice: credit,
+        invoiceItemIndex: state.creditUIState.editingItemIndex,
+        onRemoveInvoiceItemPressed: (index) =>
+            store.dispatch(DeleteCreditItem(index)),
+        onDoneInvoiceItemPressed: () => store.dispatch(EditCreditItem()),
+        onChangedInvoiceItem: (creditItem, index) {
+          if (index == credit.lineItems.length) {
+            store.dispatch(AddCreditItem(creditItem: creditItem));
+          } else {
+            store.dispatch(UpdateCreditItem(creditItem: creditItem, index: index));
+          }
+        });
+  }
+}

lib/ui/credit/edit/credit_edit_notes_vm.dart

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+import 'package:flutter/foundation.dart';
+import 'package:flutter/material.dart';
+import 'package:flutter_redux/flutter_redux.dart';
+import 'package:invoiceninja_flutter/redux/credit/credit_actions.dart';
+import 'package:invoiceninja_flutter/ui/invoice/edit/invoice_edit_notes.dart';
+import 'package:invoiceninja_flutter/ui/invoice/edit/invoice_edit_notes_vm.dart';
+import 'package:redux/redux.dart';
+import 'package:invoiceninja_flutter/data/models/models.dart';
+import 'package:invoiceninja_flutter/redux/app/app_state.dart';
+
+class CreditEditNotesScreen extends StatelessWidget {
+  const CreditEditNotesScreen({Key key}) : super(key: key);
+
+  @override
+  Widget build(BuildContext context) {
+    return StoreConnector<AppState, CreditEditNotesVM>(
+      converter: (Store<AppState> store) {
+        return CreditEditNotesVM.fromStore(store);
+      },
+      builder: (context, viewModel) {
+        return InvoiceEditNotes(
+          viewModel: viewModel,
+        );
+      },
+    );
+  }
+}
+
+class CreditEditNotesVM extends EntityEditNotesVM {
+  CreditEditNotesVM({
+    CompanyEntity company,
+    InvoiceEntity invoice,
+    Function(InvoiceEntity) onChanged,
+  }) : super(
+          company: company,
+          invoice: invoice,
+          onChanged: onChanged,
+        );
+
+  factory CreditEditNotesVM.fromStore(Store<AppState> store) {
+    final AppState state = store.state;
+    final credit = state.creditUIState.editing;
+
+    return CreditEditNotesVM(
+      company: state.company,
+      invoice: credit,
+      onChanged: (InvoiceEntity credit) => store.dispatch(UpdateCredit(credit)),
+    );
+  }
+}