rand dart fix

deprecated/cupertino_controllers/example/lib/main.dart

@@ -4,7 +4,6 @@ import 'tabs/master_detail_controller.dart';
 
 import 'tabs/table_view_controller.dart';
 
-import 'package:flutter/foundation.dart';
 
 void main() => runApp(MyApp());
 
@@ -26,11 +25,11 @@ class CupertinoControllersApp extends StatelessWidget {
         items: [
           BottomNavigationBarItem(
             icon: Icon(Icons.list),
-            title: Text("Table"),
+            label: Text("Table"),
           ),
           BottomNavigationBarItem(
             icon: Icon(Icons.layers),
-            title: Text("Mater Detail"),
+            label: Text("Mater Detail"),
           ),
         ],
       ),
@@ -41,9 +40,9 @@ class CupertinoControllersApp extends StatelessWidget {
         ];
         return CupertinoTabView(
           builder: (BuildContext context) {
-            return pages[index]?.child;
+            return pages[index].child;
           },
-          defaultTitle: pages[index]?.title,
+          defaultTitle: pages[index].title,
         );
         ;
       },

deprecated/cupertino_controllers/example/lib/tabs/table_view_controller.dart

@@ -80,7 +80,7 @@ class TableViewScreenState extends State<TableViewScreen>
     var _sections = <CupertinoTableViewSection>[];
 
     _sections = _buildSections(context,
-        data: _search != null && _search.isNotEmpty
+        data: _search.isNotEmpty
             ? _searchItems(context, search: _search)
             : contacts);
 
@@ -117,10 +117,9 @@ class TableViewScreenState extends State<TableViewScreen>
               });
             },
             onChanged: (String value) {
-              if (value != null)
-                setState(() {
-                  _search = value;
-                });
+              setState(() {
+                _search = value;
+              });
             },
           ),
         ),
@@ -144,17 +143,15 @@ class TableViewScreenState extends State<TableViewScreen>
       },
       isEditing: _isEditing,
       onEditing: (bool value) {
-        if (value != null) {
+        setState(() {
+          _isEditing = value;
+        });
+        if (!_isEditing) {
           setState(() {
-            _isEditing = value;
+            selected.clear();
           });
-          if (!_isEditing) {
-            setState(() {
-              selected.clear();
-            });
-          }
         }
-      },
+            },
       isSearching: _isSearching,
       showEditingButtonLeft: true,
     );
@@ -197,7 +194,7 @@ class TableViewScreenState extends State<TableViewScreen>
   }
 
   Widget _buildListTile(BuildContext context, List<String> item) {
-    final bool _selected = selected?.contains(item) ?? false;
+    final bool _selected = selected.contains(item) ?? false;
     CupertinoEditingAction _action;
     switch (sharedValue) {
       case 0:

deprecated/cupertino_controllers/lib/table_view_controller/controller.dart

@@ -138,7 +138,7 @@ class CupertinoTableViewController extends StatelessWidget {
     }
 
     return DefaultTextStyle(
-      style: Theme.of(context).textTheme.title!,
+      style: Theme.of(context).textTheme.titleLarge!,
       child: Scaffold(
         body: CustomScrollView(
           primary: true,

deprecated/cupertino_controllers/lib/table_view_controller/templates/phone_tile.dart

@@ -1,5 +1,4 @@
 import 'package:flutter/cupertino.dart';
-import 'package:flutter/material.dart';
 
 import '../../widgets/text.dart';
 

deprecated/cupertino_controllers/lib/widgets/search.dart

@@ -14,9 +14,7 @@ class CupertinoSearchBar extends AnimatedWidget {
     this.onClear,
     this.enabled = true,
     this.autoCorrect = true,
-  })  : assert(controller != null),
-        assert(focusNode != null),
-        super(key: key, listenable: animation);
+  })  : super(key: key, listenable: animation);
 
   final TextEditingController controller;
   final FocusNode focusNode;
@@ -68,7 +66,7 @@ class CupertinoSearchBar extends AnimatedWidget {
                         style: new TextStyle(
                           inherit: false,
                           color: CupertinoColors.inactiveGray
-                              .withOpacity(_opacityTween.evaluate(animation)),
+                              .withValues(alpha: _opacityTween.evaluate(animation)),
                           fontSize: _kFontSize,
                         ),
                       ),
@@ -102,11 +100,10 @@ class CupertinoSearchBar extends AnimatedWidget {
                         ),
                       ),
                       new CupertinoButton(
-                        minSize: 10.0,
                         padding: const EdgeInsets.all(1.0),
                         borderRadius: new BorderRadius.circular(30.0),
-                        color: CupertinoColors.inactiveGray.withOpacity(
-                          1.0 - _opacityTween.evaluate(animation),
+                        color: CupertinoColors.inactiveGray.withValues(
+                          alpha: 1.0 - _opacityTween.evaluate(animation),
                         ),
                         child: new Icon(
                           Icons.close,
@@ -118,7 +115,7 @@ class CupertinoSearchBar extends AnimatedWidget {
                             return;
                           else
                             onClear!();
-                        },
+                        }, minimumSize: Size(10.0, 10.0),
                       ),
                     ],
                   ),

deprecated/cupertino_controllers/lib/widgets/text.dart

@@ -1,4 +1,3 @@
-import 'package:flutter/material.dart';
 import 'package:flutter/cupertino.dart';
 
 enum CupertinoTextTheme { title, subtitle, detail, custom }

deprecated/dart_firebase/example/lib/main.dart

@@ -168,11 +168,6 @@ class _UsesExampleState extends State<UsesExample> {
       ),
       body: Builder(
         builder: (_) {
-          if (_users == null) {
-            return Center(
-              child: CircularProgressIndicator(),
-            );
-          }
           if (_users.isEmpty) {
             return Center(
               child: Text('No Users Found'),

deprecated/dart_firebase/lib/src/client.dart

@@ -49,9 +49,7 @@ class App {
     this.messagingSenderId,
     this.appId,
     String? database,
-  })  : _name = database,
-        assert(apiKey != null),
-        assert(projectId != null);
+  })  : _name = database;
 
   factory App.fromJson(Map<String, dynamic> json) {
     return App(

deprecated/dart_firebase/lib/src/impl/browser.dart

@@ -14,7 +14,7 @@ class FirestoreClientImpl extends FirestoreHttpClient {
 
   @override
   Future<dynamic> sendHttpRequest(Uri uri,
-      {bool needsToken: true,
+      {bool needsToken = true,
       String? extract,
       Map<String, dynamic>? body}) async {
     var request = new HttpRequest();

deprecated/dart_firebase/lib/src/impl/common/http.dart

@@ -26,10 +26,6 @@ abstract class FirestoreHttpClient implements FirestoreClient {
   FirestoreAccessToken token;
 
   bool isCurrentTokenValid(bool refreshable) {
-    if (token == null) {
-      return false;
-    }
-
     if (refreshable) {
       var now = DateTime.now();
       return token.expiresAt.difference(now).abs().inSeconds >= 60;
@@ -81,13 +77,11 @@ abstract class FirestoreHttpClient implements FirestoreClient {
 
   @override
   CollectionReference collection(String path) {
-    assert(path != null);
     return CollectionReference(this, path.split('/'));
   }
 
   @override
   DocumentReference document(String path) {
-    assert(path != null);
     return DocumentReference(this, path.split('/'));
   }
 
@@ -99,22 +93,22 @@ abstract class FirestoreHttpClient implements FirestoreClient {
 
   Future<Map<String, dynamic>?> getJsonMap(String url,
       {Map<String, dynamic>? body,
-      String? extract: "response",
-      bool standard: true}) async {
+      String? extract = "response",
+      bool standard = true}) async {
     return (await sendHttpRequest(_apiUrl(url, standard),
         body: body, extract: extract)) as Map<String, dynamic>?;
   }
 
   Future<List<dynamic>?> getJsonList(String url,
       {Map<String, dynamic>? body,
-      String extract: "response",
-      bool standard: true}) async {
+      String extract = "response",
+      bool standard = true}) async {
     return (await sendHttpRequest(_apiUrl(url, standard),
         body: body, extract: extract)) as List<dynamic>?;
   }
 
   Future<dynamic> sendHttpRequest(Uri uri,
-      {bool needsToken: true, String? extract, Map<String, dynamic>? body});
+      {bool needsToken = true, String? extract, Map<String, dynamic>? body});
 
   Uri _apiUrl(String path, bool standard) {
     path = standard ? "$path" : path;

deprecated/dart_firebase/lib/src/impl/io.dart

@@ -27,7 +27,7 @@ class FirestoreClientImpl extends FirestoreHttpClient {
 
   @override
   Future<dynamic> sendHttpRequest(Uri uri,
-      {bool needsToken: true,
+      {bool needsToken = true,
       String? extract,
       Map<String, dynamic>? body}) async {
     if (endpoints.enableProxyMode) {

deprecated/dart_firebase/lib/src/types/firestore/document_reference.dart

@@ -25,7 +25,6 @@ class DocumentReference implements FirestoreReference {
   /// Returns the reference of a collection contained inside of this
   /// document.
   CollectionReference collection(String collectionPath) {
-    assert(collectionPath != null);
     return CollectionReference(client, <String>[path, collectionPath]);
   }
 

deprecated/dart_firebase/lib/tool.dart

@@ -21,9 +21,7 @@ const List<String> _passwordEnvVars = const <String>[
 String? _getEnvKey(List<String> possible) {
   for (var key in possible) {
     var dartEnvValue = new String.fromEnvironment(key);
-    if (dartEnvValue != null) {
-      return dartEnvValue;
-    }
+    return dartEnvValue;
   
     if (Platform.environment.containsKey(key) &&
         Platform.environment[key]!.isNotEmpty) {

deprecated/dynamic_tabs/lib/data/models/tab_state.dart

@@ -67,7 +67,7 @@ class TabState extends ChangeNotifier {
 
   void changeTabOrder(List<String> _list) {
     List<String> _tabs = _list;
-    if (_tabs != null && _tabs.isNotEmpty) {
+    if (_tabs.isNotEmpty) {
       List<DynamicTab> _newOrder = [];
       for (var item in _tabs) {
         _newOrder.add(_items!.firstWhere((t) => t.tag == item));
@@ -92,14 +92,12 @@ class TabState extends ChangeNotifier {
   void _loadIndex() {
     if (_persistIndex) {
       int _index = _storage.getInt(navKey);
-      if (_index != null) {
-        if (_index > _maxTabs) {
-          _index = 0;
-        }
-        _currentIndex = _index;
-        notifyListeners();
+      if (_index > _maxTabs) {
+        _index = 0;
       }
-      _saveIndex();
+      _currentIndex = _index;
+      notifyListeners();
+          _saveIndex();
     }
   }
 

deprecated/dynamic_tabs/lib/ui/common/grid_item.dart

@@ -28,7 +28,7 @@ class GridTabItem extends StatelessWidget {
         feedback: DefaultTextStyle(
             style: adaptive && defaultTargetPlatform == TargetPlatform.iOS
                 ? CupertinoTheme.of(context).textTheme.textStyle
-                : Theme.of(context).textTheme.title!,
+                : Theme.of(context).textTheme.titleLarge!,
             child: Container(
               width: 120.0,
               height: 80.0,

deprecated/dynamic_tabs/lib/ui/edit_screen.dart

@@ -70,7 +70,7 @@ class _EditScreenState extends State<EditScreen> {
           ));
     }
     return DefaultTextStyle(
-        style: Theme.of(context).textTheme.display1!,
+        style: Theme.of(context).textTheme.headlineMedium!,
         child: Scaffold(
           appBar: AppBar(
             actions: <Widget>[
@@ -118,7 +118,7 @@ class _EditScreenState extends State<EditScreen> {
                 "Drag the icons to\norganize tabs.",
                 style: Theme.of(context)
                     .textTheme
-                    .headline4!
+                    .headlineMedium!
                     .copyWith(fontSize: 22.0),
                 textAlign: TextAlign.center,
               ),
@@ -197,7 +197,7 @@ class _BottomEditableTabBarState extends State<BottomEditableTabBar> {
             // draggable: true,
           );
         },
-        onWillAccept: (String? data) {
+        onWillAcceptWithDetails: (String? data) {
           setState(() {
             _previewIndex = _targets.indexOf(t);
           });
@@ -208,7 +208,7 @@ class _BottomEditableTabBarState extends State<BottomEditableTabBar> {
             _previewIndex = null;
           });
         },
-        onAccept: (String data) {
+        onAcceptWithDetails: (String data) {
           final DynamicTab _baseTab = _targets[_previewIndex!];
           final DynamicTab _newTab = _tabs!.firstWhere((t) => t.tag == data);
           final int _oldIndex = _tabs!.indexOf(_newTab);
@@ -232,7 +232,7 @@ class _BottomEditableTabBarState extends State<BottomEditableTabBar> {
         child: Container(),
         tab: BottomNavigationBarItem(
           icon: Icon(Icons.more_horiz),
-          title: Text("More"),
+          label: Text("More"),
         ),
         tag: "",
       ),

deprecated/dynamic_tabs/lib/ui/more_screen.dart

@@ -183,7 +183,7 @@ class MaterialPage extends StatelessWidget {
                   final i = model.extraTabs[index];
                   return ListTile(
                     leading: i.tab.icon,
-                    title: i.tab.title,
+                    title: i.tab.label,
                     selected: expanded ? index == model.subIndex : false,
                     trailing:
                         !expanded ? Icon(Icons.keyboard_arrow_right) : null,
@@ -245,7 +245,7 @@ class CupertinoPage extends StatelessWidget {
                     (BuildContext context, int index) {
                       final i = model.extraTabs[index];
                       final Icon _icon = i.tab.icon as Icon;
-                      final Text _text = i.tab.title as Text;
+                      final Text _text = i.tab.label as Text;
                       return DefaultTextStyle(
                           style: CupertinoTheme.of(context).textTheme.textStyle,
                           child: CupertinoListTile(

deprecated/easy_google_maps/lib/easy_google_maps.dart

@@ -63,19 +63,19 @@ class _EasyGoogleMapsState extends State<EasyGoogleMaps> {
       return EasyWebView(
         src: _src,
         webAllowFullScreen: true,
-        width: widget?.width,
-        height: widget?.height,
+        width: widget.width,
+        height: widget.height,
       );
     }
 
     return SizedBox(
-      width: widget?.width,
-      height: widget?.height,
+      width: widget.width,
+      height: widget.height,
       child: FutureBuilder<List<Placemark>>(
         future: geo.placemarkFromAddress(widget.address),
         builder: (_, snapshot) {
           if (snapshot.hasData) {
-            final _place = snapshot?.data?.first;
+            final _place = snapshot.data?.first;
             if (_place == null) {
               return Center(
                 child: Text('Address not found!'),
@@ -89,7 +89,7 @@ class _EasyGoogleMapsState extends State<EasyGoogleMaps> {
               markerId: MarkerId(widget.address.toString()),
               position: _latLang,
               infoWindow: InfoWindow(
-                title: widget?.title ?? '',
+                title: widget.title ?? '',
                 snippet: widget.address,
               ),
             );

deprecated/easy_web_view/example/lib/examples/basic.dart

@@ -2,7 +2,7 @@ import 'package:easy_web_view/easy_web_view.dart';
 import 'package:flutter/material.dart';
 
 class BasicExample extends StatefulWidget {
-  const BasicExample({Key? key}) : super(key: key);
+  const BasicExample({super.key});
 
   @override
   _BasicExampleState createState() => _BasicExampleState();

deprecated/easy_web_view/example/lib/examples/html_to_pdf.dart

@@ -10,7 +10,7 @@ import 'package:async/async.dart';
 import 'package:flutter/services.dart';
 
 class HtmlToPdfTest extends StatefulWidget {
-  const HtmlToPdfTest({Key? key}) : super(key: key);
+  const HtmlToPdfTest({super.key});
 
   @override
   State<HtmlToPdfTest> createState() => _HtmlToPdfTestState();

deprecated/easy_web_view/example/lib/main.dart

@@ -6,7 +6,7 @@ import 'examples/html_to_pdf.dart';
 void main() => runApp(const MyApp());
 
 class MyApp extends StatefulWidget {
-  const MyApp({Key? key}) : super(key: key);
+  const MyApp({super.key});
 
   @override
   State<MyApp> createState() => _MyAppState();

deprecated/fb_auth/example/lib/main.dart

@@ -35,7 +35,7 @@ class _MyAppState extends State<MyApp> {
   @override
   void dispose() {
     _auth.close();
-    _userChanged?.cancel();
+    _userChanged.cancel();
     super.dispose();
   }
 

deprecated/fb_auth/example/lib/plugins/desktop/io.dart

@@ -1,19 +1,8 @@
-import 'dart:io';
 
 import 'package:flutter/foundation.dart';
-import 'package:flutter/material.dart';
 
 void setTargetPlatformForDesktop({TargetPlatform platform}) {
   TargetPlatform targetPlatform;
-  if (platform != null) {
-    targetPlatform = platform;
-  }
-  if (targetPlatform == null) {
-    if (Platform.isMacOS) {
-      targetPlatform = TargetPlatform.iOS;
-    } else if (Platform.isLinux || Platform.isWindows) {
-      targetPlatform = TargetPlatform.android;
-    }
-  }
+  targetPlatform = platform;
   debugDefaultTargetPlatformOverride = targetPlatform;
 }

deprecated/fb_auth/lib/data/blocs/auth/auth_bloc.dart

@@ -72,7 +72,7 @@ class AuthBloc extends Bloc<AuthEvent, AuthState> {
     final _user = await _auth.loginGoogle(
         idToken: event.idToken, accessToken: event.accessToken);
     if (_user != null) {
-      if (saveUser != null) saveUser(_user);
+      saveUser(_user);
       yield LoggedInState(_user);
     } else {
       yield LoggedOutState();
@@ -82,37 +82,25 @@ class AuthBloc extends Bloc<AuthEvent, AuthState> {
   Stream<AuthState> _mapGuestToState(LoginGuest event) async* {
     yield AuthLoadingState();
     final _user = await _auth.startAsGuest();
-    if (_user != null) {
-      if (saveUser != null) saveUser(_user);
-      yield LoggedInState(_user);
-    } else {
-      yield LoggedOutState();
+    saveUser(_user);
+    yield LoggedInState(_user);
     }
-  }
 
   Stream<AuthState> _mapCheckToState(CheckUser event) async* {
     yield AuthLoadingState();
     final _user = await _auth.currentUser();
-    if (_user != null) {
-      if (saveUser != null) saveUser(_user);
-      yield LoggedInState(_user);
-    } else {
-      yield LoggedOutState();
+    saveUser(_user);
+    yield LoggedInState(_user);
     }
-  }
 
   Stream<AuthState> _mapCreateToState(CreateAccount event) async* {
     yield AuthLoadingState();
     try {
       AuthUser _user = await _auth.createAccount(event.username, event.password,
-          displayName: event?.displayName, photoUrl: event?.photoUrl);
-      if (_user != null) {
-        if (saveUser != null) saveUser(_user);
-        yield LoggedInState(_user);
-      } else {
-        yield AuthErrorState('Error creating user!');
-      }
-    } catch (e) {
+          displayName: event.displayName, photoUrl: event.photoUrl);
+      saveUser(_user);
+      yield LoggedInState(_user);
+        } catch (e) {
       yield AuthErrorState('Email already exists!');
     }
   }
@@ -120,18 +108,14 @@ class AuthBloc extends Bloc<AuthEvent, AuthState> {
   Stream<AuthState> _mapLoginToState(LoginEvent event) async* {
     yield AuthLoadingState();
     final _user = await _auth.login(event.username, event.password);
-    if (_user != null) {
-      if (saveUser != null) saveUser(_user);
-      yield LoggedInState(_user);
-    } else {
-      yield AuthErrorState('Username or Password Incorrect!');
+    saveUser(_user);
+    yield LoggedInState(_user);
     }
-  }
 
   Stream<AuthState> _mapLogoutToState(LogoutEvent event) async* {
     yield AuthLoadingState();
     await _auth.logout();
-    if (deleteUser != null) deleteUser();
+    deleteUser();
     yield LoggedOutState();
   }
 
@@ -142,20 +126,16 @@ class AuthBloc extends Bloc<AuthEvent, AuthState> {
   Stream<AuthState> _mapEditInfoToState(EditInfo event) async* {
     yield AuthLoadingState();
     await _auth.editInfo(
-        displayName: event?.displayName, photoUrl: event?.photoUrl);
+        displayName: event.displayName, photoUrl: event.photoUrl);
     final _user = await _auth.currentUser();
-    if (saveUser != null) saveUser(_user);
+    saveUser(_user);
     yield LoggedInState(_user);
   }
 
   Stream<AuthState> _mapUpdateToState(UpdateUser event) async* {
-    if (event?.user != null) {
-      if (saveUser != null) saveUser(event.user);
-      yield LoggedInState(event.user);
-    } else {
-      yield LoggedOutState();
+    saveUser(event.user);
+    yield LoggedInState(event.user);
     }
-  }
 
   Stream<AuthState> _mapForgotPasswordToState(ForgotPassword event) async* {
     await _auth.forgotPassword(event.email);

deprecated/fb_auth/lib/data/services/auth/io.dart

@@ -2,7 +2,6 @@ import 'dart:convert';
 import 'dart:io';
 
 import '../../classes/index.dart';
-import '../../utils/directory.dart';
 import '../mobile/sdk.dart';
 import '../rest_api/client.dart';
 import 'impl.dart';
@@ -35,12 +34,8 @@ class FBAuth implements FBAuthImpl {
         },
         onSave: (data) async {
           try {
-            if (data == null) {
-              await _saveFile.delete();
-            } else {
-              await _saveFile.writeAsString(json.encode(data));
-            }
-          } catch (e) {}
+            await _saveFile.writeAsString(json.encode(data));
+                    } catch (e) {}
         },
       );
     }
@@ -50,10 +45,7 @@ class FBAuth implements FBAuthImpl {
   }
 
   Future _loadFile() async {
-    if (_saveFile == null) {
-      final dir = await PathUtils.getDocumentDir();
-      _saveFile = File('${dir.path}/fb_auth.json');
-    }
+    
   }
 
   bool get useClient => isDesktop || useRestClient;

deprecated/fb_auth/lib/data/services/auth/web.dart

@@ -115,8 +115,8 @@ class FBAuth implements FBAuthImpl {
   Future editInfo({String displayName, String photoUrl}) async {
     final _user = _auth.currentUser;
     final _info = UserProfile();
-    if (displayName != null) _info.displayName = displayName;
-    if (photoUrl != null) _info.photoURL = photoUrl;
+    _info.displayName = displayName;
+    _info.photoURL = photoUrl;
     try {
       await _user.updateProfile(_info);
     } catch (e) {

deprecated/fb_auth/lib/data/services/mobile/sdk.dart

@@ -94,8 +94,8 @@ class FbSdk implements FBAuthImpl {
   Future editInfo({String displayName, String photoUrl}) async {
     final _user = await _auth.currentUser();
     final _info = UserUpdateInfo();
-    if (displayName != null) _info.displayName = displayName;
-    if (photoUrl != null) _info.photoUrl = photoUrl;
+    _info.displayName = displayName;
+    _info.photoUrl = photoUrl;
     try {
       await _user.updateProfile(_info);
     } catch (e) {

deprecated/fb_auth/lib/data/services/rest_api/client.dart

@@ -43,18 +43,16 @@ class FbClient implements FBAuthImpl {
   @override
   Future<AuthUser> currentUser() async {
     FirestoreJsonAccessToken token = await _loadToken();
-    if (token != null) {
-      var result = await http.post(
-        'https://identitytoolkit.googleapis.com/v1/accounts:lookup?key=${app.apiKey}',
-        body: json.encode({
-          "idToken": token?.idToken,
-          "returnSecureToken": true,
-        }),
-      );
-      token = await _saveToken(result);
-      return _getUser(token);
-    }
-    return null;
+    var result = await http.post(
+      'https://identitytoolkit.googleapis.com/v1/accounts:lookup?key=${app.apiKey}',
+      body: json.encode({
+        "idToken": token.idToken,
+        "returnSecureToken": true,
+      }),
+    );
+    token = await _saveToken(result);
+    return _getUser(token);
+      return null;
   }
 
   @override
@@ -63,16 +61,15 @@ class FbClient implements FBAuthImpl {
     final result = await http.post(
       'https://identitytoolkit.googleapis.com/v1/accounts:update?key=${app.apiKey}',
       body: json.encode({
-        "idToken": token?.idToken,
-        if (displayName != null) ...{
-          'displayName': displayName,
-        },
-        if (photoUrl != null) ...{
-          'photoUrl': photoUrl,
-        },
+        "idToken": token.idToken,
+        ...{
+        'displayName': displayName,
+      },
+        ...{
+        'photoUrl': photoUrl,
+      },
         "deleteAttribute": [
-          if (displayName == null) 'DISPLAY_NAME',
-          if (photoUrl == null) 'PHOTO_URL',
+          
         ],
         "returnSecureToken": true,
       }),
@@ -126,7 +123,7 @@ class FbClient implements FBAuthImpl {
     var result = await http.post(
       'https://identitytoolkit.googleapis.com/v1/accounts:sendOobCode?key=${app.apiKey}',
       body: json.encode({
-        "idToken": token?.idToken,
+        "idToken": token.idToken,
         "requestType": 'VERIFY_EMAIL',
       }),
     );
@@ -169,12 +166,12 @@ class FbClient implements FBAuthImpl {
         final _user = FirebaseUser(item, token.idToken);
         if (_user.uid == token.localId) {
           final _auth = AuthUser(
-            displayName: _user?.displayName,
-            email: _user?.email,
-            isAnonymous: _user?.isAnonymous ?? true,
-            isEmailVerified: _user?.isEmailVerified ?? false,
+            displayName: _user.displayName,
+            email: _user.email,
+            isAnonymous: _user.isAnonymous ?? true,
+            isEmailVerified: _user.isEmailVerified ?? false,
             photoUrl: _user.photoUrl,
-            uid: _user?.uid,
+            uid: _user.uid,
           );
           _onAuthChanged.add(_auth);
           return _auth;
@@ -185,11 +182,9 @@ class FbClient implements FBAuthImpl {
 
   Future<FirestoreJsonAccessToken> _loadToken() async {
     final _data = await onLoad();
-    if (_data != null) {
-      final token = FirestoreJsonAccessToken(_data, DateTime.now());
-      return token;
-    }
-    return null;
+    final token = FirestoreJsonAccessToken(_data, DateTime.now());
+    return token;
+      return null;
   }
 
   @override

deprecated/fb_auth/lib/data/services/rest_api/helpers/user.dart

@@ -24,7 +24,7 @@ class FirebaseUser {
     }).toList();
   }
 
-  bool get isAnonymous => email == null || email.isEmpty;
+  bool get isAnonymous => email.isEmpty;
 
   bool get isEmailVerified => json['emailVerified'];
 

deprecated/fb_firestore/example/lib/main.dart

@@ -1,7 +1,5 @@
 import 'package:flutter/material.dart';
-import 'dart:async';
 
-import 'package:flutter/services.dart';
 import 'package:fb_firestore/fb_firestore.dart';
 
 void main() => runApp(MyApp());

deprecated/features/example/lib/main.dart

@@ -77,7 +77,7 @@ class _MyHomePageState extends State<MyHomePage> {
               ),
               Text(
                 '$_counter',
-                style: Theme.of(context).textTheme.headline4,
+                style: Theme.of(context).textTheme.headlineMedium,
               ),
               FeatureBuilder(
                 feature: _counterFeature,

deprecated/file_access/lib/src/pick_file/io.dart

@@ -9,13 +9,11 @@ import 'package:image_picker/image_picker.dart';
 
 Future<FileX> openFile() async {
   final _files = await _open(false, false);
-  if (_files == null) return null;
   return _files.first;
 }
 
 Future<List<FileX>> openFiles() async {
   final _files = await _open(true, false);
-  if (_files == null) return null;
   return _files;
 }
 
@@ -30,7 +28,7 @@ Future<FileX> pickImage() async {
       fileExtensions: kImageExtensions,
     ),
   ]);
-  if (_files == null || _files.isEmpty) return null;
+  if (_files.isEmpty) return null;
   return _files.first;
 }
 
@@ -45,7 +43,7 @@ Future<FileX> pickVideo() async {
       fileExtensions: kVideoExtensions,
     ),
   ]);
-  if (_files == null || _files.isEmpty) return null;
+  if (_files.isEmpty) return null;
   return _files.first;
 }
 
@@ -68,13 +66,11 @@ Future<List<FileX>> _open(bool multiple, bool folders,
     final List<FileX> _files = [];
     if (multiple) {
       List<File> files = await FilePicker.getMultiFile();
-      if (files == null) return null;
       for (final file in files) {
         _files.add(await _add(file));
       }
     } else {
       File file = await FilePicker.getFile();
-      if (file == null) return null;
       _files.add(await _add(file));
     }
     return _files;

deprecated/file_access/lib/src/pick_file/web.dart

@@ -6,31 +6,30 @@ import 'dart:html' as html;
 
 Future<FileX> pickImage() async {
   final _files = await _open(false, false, 'image/*');
-  if (_files == null || _files.isEmpty) return null;
+  if (_files.isEmpty) return null;
   return _files.first;
 }
 
 Future<FileX> pickVideo() async {
   final _files = await _open(false, false, 'video/*');
-  if (_files == null || _files.isEmpty) return null;
+  if (_files.isEmpty) return null;
   return _files.first;
 }
 
 Future<FileX> pickAudio() async {
   final _files = await _open(false, false, 'audio/*');
-  if (_files == null || _files.isEmpty) return null;
+  if (_files.isEmpty) return null;
   return _files.first;
 }
 
 Future<FileX> openFile() async {
   final _files = await _open(false, false);
-  if (_files == null || _files.isEmpty) return null;
+  if (_files.isEmpty) return null;
   return _files.first;
 }
 
 Future<List<FileX>> openFiles() async {
   final _files = await _open(true, false);
-  if (_files == null) return null;
   return _files;
 }
 
@@ -46,7 +45,6 @@ Future<List<FileX>> _open(bool multiple, bool folders,
   }
   _upload.click();
   final _file = await _upload.onChange.first;
-  if (_file == null) return null;
   List<html.File> files = (_file.target as dynamic).files;
   final List<FileX> _files = [];
   for (final f in files) {

deprecated/floating_search_bar/example/lib/main.dart

@@ -25,9 +25,7 @@ void _setTargetPlatformForDesktop() {
   } else if (Platform.isLinux || Platform.isWindows) {
     targetPlatform = TargetPlatform.android;
   }
-  if (targetPlatform != null) {
-    debugDefaultTargetPlatformOverride = targetPlatform;
-  }
+  debugDefaultTargetPlatformOverride = targetPlatform;
 }
 
 class MyApp extends StatefulWidget {

deprecated/floating_search_bar/lib/ui/sliver_search_bar.dart

@@ -19,11 +19,7 @@ class SliverFloatingBar extends StatefulWidget {
     this.floating = false,
     this.pinned = false,
     this.snap = false,
-  })  : assert(automaticallyImplyLeading != null),
-        assert(floating != null),
-        assert(pinned != null),
-        assert(snap != null),
-        assert(floating || !snap,
+  })  : assert(floating || !snap,
             'The "snap" argument only makes sense for floating app bars.'),
         super(key: key);
 
@@ -224,35 +220,28 @@ class _FloatingAppBarState extends State<_FloatingAppBar> {
   @override
   void didChangeDependencies() {
     super.didChangeDependencies();
-    if (_position != null)
-      _position.isScrollingNotifier.removeListener(_isScrollingListener);
-    _position = Scrollable.of(context)?.position;
-    if (_position != null)
-      _position.isScrollingNotifier.addListener(_isScrollingListener);
+    _position.isScrollingNotifier.removeListener(_isScrollingListener);
+    _position = Scrollable.of(context).position;
+    _position.isScrollingNotifier.addListener(_isScrollingListener);
   }
 
   @override
   void dispose() {
-    if (_position != null)
-      _position.isScrollingNotifier.removeListener(_isScrollingListener);
+    _position.isScrollingNotifier.removeListener(_isScrollingListener);
     super.dispose();
   }
 
   RenderSliverFloatingPersistentHeader _headerRenderer() {
-    return context.ancestorRenderObjectOfType(
-        const TypeMatcher<RenderSliverFloatingPersistentHeader>());
+    return context.findAncestorRenderObjectOfType<RenderSliverFloatingPersistentHeader>(
+        );
   }
 
   void _isScrollingListener() {
-    if (_position == null) return;
-
-    // When a scroll stops, then maybe snap the appbar into view.
-    // Similarly, when a scroll starts, then maybe stop the snap animation.
     final RenderSliverFloatingPersistentHeader header = _headerRenderer();
     if (_position.isScrollingNotifier.value)
-      header?.maybeStopSnapAnimation(_position.userScrollDirection);
+      header.maybeStopSnapAnimation(_position.userScrollDirection);
     else
-      header?.maybeStartSnapAnimation(_position.userScrollDirection);
+      header.maybeStartSnapAnimation(_position.userScrollDirection);
   }
 
   @override

deprecated/flutter_ast/lib/cli/generator.dart

@@ -132,7 +132,6 @@ void _processFile(
       if (item.isValid) {
         if (!cache.addName(item.name)) continue;
         final _template = _processClass(item, input);
-        if (_template == null) continue;
         final name = ReCase(item.name).snakeCase;
         final _path = 'classes/' + name + '.dart';
         final _file = _getFile(output.path, _path);

deprecated/flutter_ast/lib/flutter_ast.dart

@@ -6,7 +6,7 @@ import 'src/index.dart';
 export 'src/index.dart';
 
 DartResult parseSource(String source, [String path]) {
-  assert(source != null && source.isNotEmpty);
+  assert(source.isNotEmpty);
   final result = parseString(
     content: source,
     path: path,

deprecated/flutter_ast/lib/src/class.dart

@@ -25,10 +25,10 @@ extension ClauseDeclarationImplUtils on ClassDeclarationImpl {
       comments.add(item.toDartComment());
     }
     return base.copyWith(
-      isAbstract: this?.abstractKeyword != null,
-      extendsClause: this?.extendsClause?.toString(),
-      implementsClause: this?.implementsClause?.toString(),
-      withClause: this?.withClause?.toString(),
+      isAbstract: this.abstractKeyword != null,
+      extendsClause: this.extendsClause?.toString(),
+      implementsClause: this.implementsClause?.toString(),
+      withClause: this.withClause?.toString(),
       fields: fields,
       constructors: constructors,
       methods: methods,

deprecated/flutter_ast/lib/src/field.dart

@@ -51,12 +51,11 @@ extension DefaultFormalParameterImplUtils on DefaultFormalParameterImpl {
             base = base.copyWith(name: child.toString());
           }
         }
-        if (fields != null)
-          for (final field in fields) {
-            if (field.name == base.name) {
-              base = base.copyWith(type: field.type);
-            }
+        for (final field in fields) {
+          if (field.name == base.name) {
+            base = base.copyWith(type: field.type);
           }
+        }
       }
       if (node.runtimeType.toString() == 'SimpleToken' &&
           node.toString() == '=') {

deprecated/flutter_ast/lib/src/generator/parser.dart

@@ -38,22 +38,22 @@ class GenParser {
 
   void merge(String source) {
     final DartResult result = parseSource(source);
-    if (result?.file != null) {
-      if (result?.file?.classes != null) {
+    if (result.file != null) {
+      if (result.file?.classes != null) {
         for (final item in result.file.classes) {
           this._classes.putIfAbsent(item.name, () => item);
         }
       }
-      if (result?.file?.enums != null) {
+      if (result.file?.enums != null) {
         this._enums.addAll(result.file.enums);
       }
-      if (result?.file?.fields != null) {
+      if (result.file?.fields != null) {
         this._fields.addAll(result.file.fields);
       }
-      if (result?.file?.methods != null) {
+      if (result.file?.methods != null) {
         this._methods.addAll(result.file.methods);
       }
-      if (result?.file?.imports != null) {
+      if (result.file?.imports != null) {
         this._imports.addAll(result.file.imports);
       }
     }

deprecated/flutter_cli/lib/src/commands/command.dart

@@ -18,7 +18,7 @@ abstract class NgDartCommand extends Command {
   String readArg(String errorMessage) {
     var args = argResults.rest;
 
-    if (args == null || args.length == 0) {
+    if (args.length == 0) {
       // Usage is provided by command runner.
       throw new UsageException(errorMessage, '');
     }

deprecated/flutter_cli/lib/src/file_reader.dart

@@ -12,9 +12,9 @@ class FileReader {
 
   FileReader._();
 
-  String readAsString(String filePath, {Encoding encoding: utf8}) =>
+  String readAsString(String filePath, {Encoding encoding = utf8}) =>
       new File(filePath).readAsStringSync(encoding: encoding);
 
-  List<String> readAsLines(String filePath, {Encoding encoding: utf8}) =>
+  List<String> readAsLines(String filePath, {Encoding encoding = utf8}) =>
       new File(filePath).readAsLinesSync(encoding: encoding);
 }

deprecated/flutter_cli/lib/src/package_uri_resolver.dart

@@ -42,8 +42,6 @@ class PackageUriResolver {
 
   /// Resolves a package URI to a file path.
   String resolve(String packageUri) {
-    if (_packageMap == null) _buildPackageMap();
-
     var packageName = getPackageName(packageUri);
 
     if (_packageMap[packageName] == null) {

deprecated/flutter_cli/lib/src/page_object_data.dart

@@ -81,7 +81,7 @@ class _Selector {
     return new _Selector('ByTagName', element.localName);
   }
 
-  _Selector(this.type, this.name, [this.value]);
+  _Selector(this.type, this.name);
 
   @override
   String toString() => "@$type('${value ?? name}')";
@@ -99,9 +99,6 @@ class _Variable implements Comparable<_Variable> {
 
   factory _Variable.fromElement(Element element) {
     var selector = new _Selector.fromElement(element);
-    if (selector == null) {
-      return null;
-    }
 
     var type = new DartClassInfo(
         'PageLoaderElement', 'package:pageloader/objects.dart');

deprecated/flutter_cli/lib/src/project_model.dart

@@ -49,7 +49,7 @@ class ProjectModel {
       this.componentClassUri, this.dartClasses, this.components, this.modules);
 
   /// Whether providers are needed when generating test.
-  bool get needProviders => serviceClasses != null && serviceClasses.isNotEmpty;
+  bool get needProviders => serviceClasses.isNotEmpty;
 
   /// Uris for service classes used.
   List<String> get referencedUris => serviceClasses
@@ -84,10 +84,6 @@ class ProjectModel {
             file, out, asts.publicUris, _getBindingVariables(components))));
 
     var componentClassName = className;
-    if (componentClassName == null) {
-      componentClassName =
-          _getComponentClassName(componentClassUri, components);
-    }
 
     var serviceClasses = _getServiceClasses(
         componentClassName, dartClasses, components, modules);
@@ -125,8 +121,6 @@ Set<String> _getBindingVariables(Map<String, ComponentInfo> components) {
   var result = new Set<String>();
 
   for (var component in components.values) {
-    if (component.module == null) continue;
-
     for (var binding in component.module.directChildren) {
       if (binding is String) result.add(binding);
     }
@@ -159,17 +153,14 @@ List<String> _getServiceClasses(
   var dependencies = <String>[];
   for (var parameter in dartClasses[componentClassName].constructorParameters) {
     var service = parameter.dependency;
-    if (dartClasses[service].uri == null) continue;
 
     dependencies.add(service);
   }
 
   var module = components[componentClassName].module;
-  if (module != null) {
-    for (var binding in module.getAllBindingInstances(modules)) {
-      if (dependencies.contains(binding.className)) {
-        dependencies.remove(binding.className);
-      }
+  for (var binding in module.getAllBindingInstances(modules)) {
+    if (dependencies.contains(binding.className)) {
+      dependencies.remove(binding.className);
     }
   }
 

deprecated/flutter_cli/lib/src/visitors/binding_helper.dart

@@ -56,7 +56,7 @@ void processBindingElement(Expression node, ModuleInfo module) {
     throw new UnsupportedError('Unable to handle $node.');
   }
 
-  if (binding != null) module.directChildren.add(binding);
+  module.directChildren.add(binding);
 }
 
 /// Extracts binding information from instance creation expression [node].
@@ -107,10 +107,8 @@ BindingInstance _buildBindingInstance(
     binding = new BindingInstance(token.value, creationExpression);
   }
 
-  if (binding != null) {
-    _handleBindingArgs(args, binding);
-    return binding;
-  }
+  _handleBindingArgs(args, binding);
+  return binding;
 
   throw new UnsupportedError('Unable to handle $token '
       '(${token.runtimeType}) in $creationExpression');

deprecated/flutter_cli/lib/src/visitors/binding_info.dart

@@ -53,9 +53,7 @@ class ModuleInfo extends BindingInfo {
   /// Expands binding information in this module.
   List<BindingInstance> getAllBindingInstances(
       Map<String, ModuleInfo> allModules) {
-    if (_allBindingInstances != null) {
-      return _allBindingInstances;
-    }
+    return _allBindingInstances;
   
     _allBindingInstances = [];
 

deprecated/flutter_cli/lib/src/visitors/dart_class_visitor.dart

@@ -51,7 +51,7 @@ class DartClassVisitor extends RecursiveAstVisitor {
     var classInfo = _getClass(className(classDeclaration));
 
     // Only first appeared class is used to get more accurate matching.
-    if (classInfo.uri != null) return;
+    return;
 
     classInfo.uri = _publicUris[_uri];
 

deprecated/flutter_cli/test/ast_cache_test.dart

@@ -97,13 +97,13 @@ var _dotPackages = ['a:a/lib/', 'b:b/lib/'];
 
 class FileReaderMock implements FileReader {
   @override
-  List<String> readAsLines(String filePath, {Encoding encoding: utf8}) {
+  List<String> readAsLines(String filePath, {Encoding encoding = utf8}) {
     if (filePath == '.packages') return _dotPackages;
     return null;
   }
 
   @override
-  String readAsString(String filePath, {Encoding encoding: utf8}) {
+  String readAsString(String filePath, {Encoding encoding = utf8}) {
     for (var file in _files) {
       if (file['path'] == filePath) return file['content'];
     }

deprecated/flutter_cli/test/generate_test_test.dart

@@ -101,7 +101,7 @@ var _pubSpec = ['name: hello_flutter'];
 
 class FileReaderMock implements FileReader {
   @override
-  List<String> readAsLines(String filePath, {Encoding encoding: utf8}) {
+  List<String> readAsLines(String filePath, {Encoding encoding = utf8}) {
     if (filePath == '.packages') {
       return _dotPackages;
     } else if (filePath == 'pubspec.yaml') {
@@ -111,7 +111,7 @@ class FileReaderMock implements FileReader {
   }
 
   @override
-  String readAsString(String filePath, {Encoding encoding: utf8}) {
+  String readAsString(String filePath, {Encoding encoding = utf8}) {
     for (var file in _files) {
       if (file['path'] == filePath) return file['content'];
     }

deprecated/flutter_cli/test/package_uri_resolver_test.dart

@@ -60,11 +60,11 @@ class FileReaderMock implements FileReader {
   ];
 
   @override
-  List<String> readAsLines(Object uri, {Encoding encoding: utf8}) {
+  List<String> readAsLines(Object uri, {Encoding encoding = utf8}) {
     if (uri is String && uri == '.packages') return _dotPackages;
     return null;
   }
 
   @override
-  String readAsString(Object uri, {Encoding encoding: utf8}) => null;
+  String readAsString(Object uri, {Encoding encoding = utf8}) => null;
 }

deprecated/flutter_cli/test/project_model_test.dart

@@ -108,7 +108,7 @@ var _pubSpec = ['name: a'];
 
 class FileReaderMock implements FileReader {
   @override
-  List<String> readAsLines(String filePath, {Encoding encoding: utf8}) {
+  List<String> readAsLines(String filePath, {Encoding encoding = utf8}) {
     if (filePath == '.packages') {
       return _dotPackages;
     } else if (filePath == 'pubspec.yaml') {
@@ -118,7 +118,7 @@ class FileReaderMock implements FileReader {
   }
 
   @override
-  String readAsString(String filePath, {Encoding encoding: utf8}) {
+  String readAsString(String filePath, {Encoding encoding = utf8}) {
     for (var file in _files) {
       if (file['path'] == filePath) return file['content'];
     }

deprecated/flutter_data_view/lib/src/tag_list/screen.dart

@@ -51,10 +51,8 @@ class _TaggedDataViewState<T> extends State<TaggedDataView<T>> {
     final allTags = [...folders, ...other].toSet().toList();
     allTags.sort();
     final emptyBuilder = () {
-      if (widget?.emptyBuilder != null) {
-        return widget.emptyBuilder(context);
-      }
-      return Scaffold(
+      return widget.emptyBuilder(context);
+          return Scaffold(
         appBar: AppBar(
           centerTitle: false,
           title: Text('Details'),
@@ -66,10 +64,8 @@ class _TaggedDataViewState<T> extends State<TaggedDataView<T>> {
     };
     final detailBuilder = (int index) {
       final T item = widget.dataSource.items[index];
-      if (widget?.detailBuilder != null) {
-        return widget.detailBuilder(context, item, index);
-      }
-      return Scaffold(
+      return widget.detailBuilder(context, item, index);
+          return Scaffold(
         appBar: AppBar(
           centerTitle: false,
           title: Text('Details'),

deprecated/flutter_data_view/lib/src/tag_list/source.dart

@@ -30,7 +30,6 @@ abstract class TaggedDataTableSource<T> extends DataSource<T> {
       }
       return Icons.info;
     };
-    if (iconData() == null) return null;
     return Icon(iconData());
   }
 
@@ -64,16 +63,12 @@ abstract class TaggedDataTableSource<T> extends DataSource<T> {
     final _results = <int, DataRow>{};
     for (var i = 0; i < rowCount; i++) {
       final tags = getTagsForRow(i);
-      if (_selected == null) {
-        _results[i] = getRow(i);
-      } else {
-        for (final tag in tags) {
-          if (tag.contains(_selected)) {
-            _results[i] = getRow(i);
-          }
+      for (final tag in tags) {
+        if (tag.contains(_selected)) {
+          _results[i] = getRow(i);
         }
       }
-    }
+        }
     final search = this.search.toLowerCase();
     if (search.isEmpty) return _results;
     _results.clear();

deprecated/flutter_dynamic_widget/lib/src/accept.dart

@@ -74,37 +74,33 @@ class __WidgetAcceptState extends State<_WidgetAccept> {
 
   @override
   Widget build(BuildContext context) {
-    if (widget.child != null) {
-      return widget.child;
-    }
-    if (!widget.scope.isDragging) {
+    return widget.child;
+      if (!widget.scope.isDragging) {
       return SizedBox.fromSize(
         size: widget.sizeOnlyDragging ? null : widget.size,
         child: Container(),
       );
     }
     return SizedBox(
-      height: widget?.size?.height,
-      width: widget?.size?.width,
+      height: widget.size.height,
+      width: widget.size.width,
       child: DragTarget<Map<String, dynamic>>(
-        onAccept: (val) {
+        onAcceptWithDetails: (val) {
           if (mounted) {
             setState(() {
               _accepting = false;
             });
           }
-          if (val != null) {
-            final _data = val;
-            _data['id'] = StringGen.id;
-            if (_data['name'] == 'Text') {
-              _data['params']['style']['id'] = StringGen.id;
-            }
-            if (_data['name'] == 'Icon') {
-              _data['params']['0']['id'] = StringGen.id;
-            }
-            widget.onAccept(context, _data);
+          final _data = val;
+          _data['id'] = StringGen.id;
+          if (_data['name'] == 'Text') {
+            _data['params']['style']['id'] = StringGen.id;
           }
-        },
+          if (_data['name'] == 'Icon') {
+            _data['params']['0']['id'] = StringGen.id;
+          }
+          widget.onAccept(context, _data);
+                },
         onLeave: (val) {
           if (mounted) {
             setState(() {
@@ -112,7 +108,7 @@ class __WidgetAcceptState extends State<_WidgetAccept> {
             });
           }
         },
-        onWillAccept: (val) {
+        onWillAcceptWithDetails: (val) {
           if (mounted) {
             setState(() {
               _accepting = true;
@@ -123,11 +119,11 @@ class __WidgetAcceptState extends State<_WidgetAccept> {
         builder: (context, accepted, rejected) {
           return Center(
             child: Container(
-              width: widget?.size?.width,
-              height: widget?.size?.height,
+              width: widget.size.width,
+              height: widget.size.height,
               child: Placeholder(
                 color:
-                    !_accepting ? Colors.grey : Theme.of(context).accentColor,
+                    !_accepting ? Colors.grey : Theme.of(context).colorScheme.secondary,
               ),
             ),
           );
@@ -143,13 +139,9 @@ Map<String, dynamic> modifyAccept(Map<String, dynamic> val,
   _data['id'] = StringGen.id;
   switch (_data['name']) {
     case 'Container':
-      if (height != null) {
-        _data['params']['height'] = height;
-      }
-      if (width != null) {
-        _data['params']['width'] = width;
-      }
-      break;
+      _data['params']['height'] = height;
+          _data['params']['width'] = width;
+          break;
     default:
   }
   return _data;

deprecated/flutter_dynamic_widget/lib/src/base.dart

@@ -25,104 +25,95 @@ class DynamicWidget extends StatelessWidget implements WidgetLibrary {
   }
 
   WidgetConfig get base {
-    if (data != null) {
-      if (library[data['name']] != null) {
-        final _base = library[data['name']];
-        if (_base != null) {
-          return _base;
-        }
+    if (library[data['name']] != null) {
+      final _base = library[data['name']];
+      if (_base != null) {
+        return _base;
       }
     }
-    if (unknownWidgetBuilder != null) {
       return unknownWidgetBuilder(data);
-    }
-    return null;
+      return null;
   }
 
   static void onAction(BuildContext context, String val) {
     final data = val;
-    if (data == null) return null;
-    if (data is String) {
-      if (data.isEmpty) return null;
-      final _data = data.replaceAll('#', '');
-      if (_data.startsWith('message')) {
-        final _message = _data
-            .replaceAll('message(', '')
-            .replaceAll('(', '')
-            .replaceAll(')', '');
-        Scaffold.of(context).showSnackBar(SnackBar(
-          content: Text(_message),
-        ));
-        return;
-      }
-      if (_data.startsWith('navigate')) {
-        final _route = _data
-            .replaceAll('navigate(', '')
-            .replaceAll('(', '')
-            .replaceAll(')', '');
-        Navigator.of(context).pushNamed(_route);
-        return;
-      }
-      if (_data.startsWith('pop')) {
-        final _route = _data
-            .replaceAll('pop(', '')
-            .replaceAll('(', '')
-            .replaceAll(')', '');
-        if (_route.isNotEmpty) {
-          Navigator.popUntil(context, ModalRoute.withName(_route));
-        } else {
-          Navigator.of(context).pop();
-        }
-        return;
-      }
-      if (_data.startsWith('maybePop')) {
-        Navigator.of(context).maybePop();
-        return;
-      }
-      if (_data.startsWith('launch')) {
-        final _url = _data
-            .replaceAll("launch(", '')
-            .replaceAll('(', '')
-            .replaceAll(')', '')
-            .replaceAll("\'", '');
-        launch('$_url');
-        return;
-      }
-      if (_data.startsWith('alert')) {
-        final _message = _data
-            .replaceAll('alert(', '')
-            .replaceAll('(', '')
-            .replaceAll(')', '');
-        showDialog(
-          context: context,
-          builder: (context) => AlertDialog(
-            title: Text('Info'),
-            content: Text(_message),
-            actions: [
-              FlatButton(
-                child: Text('Ok'),
-                onPressed: () => Navigator.maybePop(context),
-              ),
-            ],
-          ),
-        );
-        return;
-      }
+    if (data.isEmpty) return null;
+    final _data = data.replaceAll('#', '');
+    if (_data.startsWith('message')) {
+      final _message = _data
+          .replaceAll('message(', '')
+          .replaceAll('(', '')
+          .replaceAll(')', '');
+      Scaffold.of(context).showSnackBar(SnackBar(
+        content: Text(_message),
+      ));
+      return;
     }
-    return null;
+    if (_data.startsWith('navigate')) {
+      final _route = _data
+          .replaceAll('navigate(', '')
+          .replaceAll('(', '')
+          .replaceAll(')', '');
+      Navigator.of(context).pushNamed(_route);
+      return;
+    }
+    if (_data.startsWith('pop')) {
+      final _route = _data
+          .replaceAll('pop(', '')
+          .replaceAll('(', '')
+          .replaceAll(')', '');
+      if (_route.isNotEmpty) {
+        Navigator.popUntil(context, ModalRoute.withName(_route));
+      } else {
+        Navigator.of(context).pop();
+      }
+      return;
+    }
+    if (_data.startsWith('maybePop')) {
+      Navigator.of(context).maybePop();
+      return;
+    }
+    if (_data.startsWith('launch')) {
+      final _url = _data
+          .replaceAll("launch(", '')
+          .replaceAll('(', '')
+          .replaceAll(')', '')
+          .replaceAll("\'", '');
+      launch('$_url');
+      return;
+    }
+    if (_data.startsWith('alert')) {
+      final _message = _data
+          .replaceAll('alert(', '')
+          .replaceAll('(', '')
+          .replaceAll(')', '');
+      showDialog(
+        context: context,
+        builder: (context) => AlertDialog(
+          title: Text('Info'),
+          content: Text(_message),
+          actions: [
+            FlatButton(
+              child: Text('Ok'),
+              onPressed: () => Navigator.maybePop(context),
+            ),
+          ],
+        ),
+      );
+      return;
+    }
+      return null;
   }
 
   Widget render(BuildContext context, [bool nullOk = false]) {
-    if (base != null) {
-      if (base is WidgetBase) {
-        return Builder(
-          builder: (context) {
-            return (base as WidgetBase)?.build(context);
-          },
-        );
-      }
+    if (base is WidgetBase) {
+      return Builder(
+        builder: (context) {
+          return (base as WidgetBase).build(context);
+        },
+      );
     }
-    if (nullOk) {
+      if (nullOk) {
       return null;
     }
     return Container();

deprecated/flutter_dynamic_widget/lib/src/material/library.dart

@@ -1,6 +1,4 @@
 import '../../flutter_dynamic_widget.dart';
-import '../base.dart';
-import './index.dart';
 
 class MaterialBase extends WidgetLibrary {
   MaterialBase(this.data, this.widgetContext);
@@ -10,7 +8,7 @@ class MaterialBase extends WidgetLibrary {
   GenerateWidget get widgetRender => (context, data) {
         if (data is Map) {
           final _base = MaterialBase(data, context);
-          final _config = _base?.base;
+          final _config = _base.base;
           if (_config is WidgetBase) {
             return _config;
           }
@@ -40,14 +38,13 @@ class MaterialBase extends WidgetLibrary {
 
   @override
   WidgetConfig get base {
-    if (data == null) return null;
     final name = data['name'].toString();
     final _materialBase = library[name];
     if (_materialBase != null) return _materialBase;
     return DynamicWidget(
       data: data,
       widgetContext: widgetContext,
-    )?.base;
+    ).base;
   }
 
   static ActionCallback onAction = (context, val) {

deprecated/flutter_dynamic_widget/lib/src/utils.dart

@@ -3,7 +3,6 @@ import 'package:url_launcher/url_launcher.dart';
 import 'string_gen.dart';
 
 T getEnum<T>(String val, {T fallback, List<T> values}) {
-  if (val == null) return fallback;
   final _value = val.replaceAll('#', '');
   return values.firstWhere(
     (element) => element.toString() == _value,
@@ -21,7 +20,6 @@ Key getKey(dynamic value, [Key fallback]) {
 }
 
 Paint getPaint(Map<String, dynamic> data, [Paint fallback]) {
-  if (data == null) return fallback;
   if (data['params'] == null) return fallback;
   final params = data['params'];
   // TODO: get values here
@@ -29,7 +27,6 @@ Paint getPaint(Map<String, dynamic> data, [Paint fallback]) {
 }
 
 Decoration getDecoration(Map<String, dynamic> data, [Decoration fallback]) {
-  if (data == null) return fallback;
   if (data['params'] == null) return fallback;
   final params = data['params'];
   // TODO: get values here
@@ -37,7 +34,6 @@ Decoration getDecoration(Map<String, dynamic> data, [Decoration fallback]) {
 }
 
 Duration getDuration(Map<String, dynamic> data, [Duration fallback]) {
-  if (data == null) return fallback;
   if (data['params'] == null) return fallback;
   final params = data['params'];
   if (!params.toString().contains('zero')) {
@@ -62,7 +58,6 @@ Duration getDuration(Map<String, dynamic> data, [Duration fallback]) {
 
 BorderRadiusGeometry getBorderRadiusGeometry(Map<String, dynamic> data,
     [BorderRadiusGeometry fallback]) {
-  if (data == null) return fallback;
   if (data['params'] == null) return fallback;
   final params = data['params'];
   // TODO: get values here
@@ -70,7 +65,6 @@ BorderRadiusGeometry getBorderRadiusGeometry(Map<String, dynamic> data,
 }
 
 Matrix4 getMatrix4(Map<String, dynamic> data, [Matrix4 fallback]) {
-  if (data == null) return fallback;
   if (data['params'] == null) return fallback;
   final params = data['params'];
   // TODO: get values here
@@ -79,7 +73,6 @@ Matrix4 getMatrix4(Map<String, dynamic> data, [Matrix4 fallback]) {
 
 BorderStyle getBorderStyle(Map<String, dynamic> data,
     [BorderStyle fallback = BorderStyle.none]) {
-  if (data == null) return fallback;
   if (data['params'] == null) return fallback;
   final params = data['params'];
   // TODO: get values here
@@ -87,7 +80,6 @@ BorderStyle getBorderStyle(Map<String, dynamic> data,
 }
 
 FocusNode getFocusNode(Map<String, dynamic> data, [FocusNode fallback]) {
-  if (data == null) return fallback;
   if (data['params'] == null) return fallback;
   final params = data['params'];
   final debugLabel = getString(params['debugLabel']);
@@ -104,7 +96,6 @@ FocusNode getFocusNode(Map<String, dynamic> data, [FocusNode fallback]) {
 
 BorderSide getBorderSide(Map<String, dynamic> data,
     [BorderSide fallback = BorderSide.none]) {
-  if (data == null) return fallback;
   if (data['params'] == null) return fallback;
   final params = data['params'];
   return null;
@@ -133,7 +124,6 @@ List<Alignment> getAlignmentValues() {
 }
 
 ShapeBorder getShapeBorder(Map<String, dynamic> data, [ShapeBorder fallback]) {
-  if (data == null) return fallback;
   if (data['params'] == null) return fallback;
   final params = data['params'];
   final top = getBorderSide(params['top']);
@@ -167,7 +157,6 @@ ShapeBorder getShapeBorder(Map<String, dynamic> data, [ShapeBorder fallback]) {
 }
 
 Offset getOffset(Map<String, dynamic> data, [Offset fallback]) {
-  if (data == null) return fallback;
   if (data['params'] == null) return fallback;
   final params = data['params'];
   final dx = getDouble(params['dx']);
@@ -176,7 +165,6 @@ Offset getOffset(Map<String, dynamic> data, [Offset fallback]) {
 }
 
 BoxShadow getBoxShadow(Map<String, dynamic> data, [BoxShadow fallback]) {
-  if (data == null) return fallback;
   if (data['params'] == null) return fallback;
   final params = data['params'];
   final color = getColor(params['color']);
@@ -226,16 +214,14 @@ Map<String, dynamic> setIconData(IconData value) {
     'id': StringGen.id,
     'params': {
       '0': value.codePoint,
-      if (value?.fontFamily != null) 'fontFamily': value?.fontFamily,
-      if (value?.fontPackage != null) 'fontPackage': value?.fontPackage,
-      if (value?.matchTextDirection != null)
-        'matchTextDirection': value?.matchTextDirection,
+      if (value.fontFamily != null) 'fontFamily': value.fontFamily,
+      if (value.fontPackage != null) 'fontPackage': value.fontPackage,
+      'matchTextDirection': value.matchTextDirection,
     },
   };
 }
 
 IconData getIconData(Map<String, dynamic> data, [IconData fallback]) {
-  if (data == null) return fallback;
   final name = data['name'];
   if (name == 'IconData') {
     final params = data['params'];
@@ -258,10 +244,10 @@ IconData getIconData(Map<String, dynamic> data, [IconData fallback]) {
           getBool(params['matchTextDirection'], matchTextDirection);
     }
     return IconData(
-      codePoint ?? fallback?.codePoint,
-      fontFamily: fontFamily ?? fallback?.fontFamily,
-      fontPackage: fontPackage ?? fallback?.fontPackage,
-      matchTextDirection: matchTextDirection ?? fallback?.matchTextDirection,
+      codePoint ?? fallback.codePoint,
+      fontFamily: fontFamily ?? fallback.fontFamily,
+      fontPackage: fontPackage ?? fallback.fontPackage,
+      matchTextDirection: matchTextDirection ?? fallback.matchTextDirection,
     );
   }
   return fallback;
@@ -455,10 +441,10 @@ Map<String, dynamic> setEdgeInsets(EdgeInsets val) {
     'id': StringGen.id,
     'name': 'EdgeInsets.only',
     'params': {
-      'top': val?.top ?? 0,
-      'bottom': val?.bottom ?? 0,
-      'left': val?.left ?? 0,
-      'right': val?.right ?? 0,
+      'top': val.top ?? 0,
+      'bottom': val.bottom ?? 0,
+      'left': val.left ?? 0,
+      'right': val.right ?? 0,
     },
   };
 }
@@ -471,10 +457,10 @@ extension EdgeInsetUtils on EdgeInsets {
     double bottom,
   ]) {
     return EdgeInsets.only(
-      top: top ?? this?.top ?? 0,
-      left: left ?? this?.left ?? 0,
-      right: right ?? this?.right ?? 0,
-      bottom: bottom ?? this?.bottom ?? 0,
+      top: top ?? this.top ?? 0,
+      left: left ?? this.left ?? 0,
+      right: right ?? this.right ?? 0,
+      bottom: bottom ?? this.bottom ?? 0,
     );
   }
 

deprecated/flutter_dynamic_widget/lib/src/widget_config.dart

@@ -3,7 +3,6 @@
 import 'dart:convert';
 
 import 'package:flutter/material.dart';
-import 'package:meta/meta.dart';
 
 import 'base_class.dart';
 import 'widget_index.dart';

deprecated/flutter_dynamic_widget/lib/src/widget_index.dart

@@ -941,13 +941,11 @@ class WidgetIndex {
   Map<String, dynamic> toMap() {
     return {
       'version': version,
-      'widgets': widgets?.map((x) => x?.toMap())?.toList(),
+      'widgets': widgets.map((x) => x.toMap()).toList(),
     };
   }
 
   static WidgetIndex fromMap(Map<String, dynamic> map) {
-    if (map == null) return null;
-
     return WidgetIndex(
       version: map['version'],
       widgets: List<FlutterWidget>.from(
@@ -980,8 +978,6 @@ class FlutterWidget {
   }
 
   static FlutterWidget fromMap(Map<String, dynamic> map) {
-    if (map == null) return null;
-
     return FlutterWidget(
       name: map['name'],
       description: map['description'],

deprecated/flutter_midi/lib/src/platform_interface.dart

@@ -1,5 +1,4 @@
 import 'package:flutter/foundation.dart';
-import 'package:flutter/services.dart';
 import 'package:plugin_platform_interface/plugin_platform_interface.dart';
 
 import 'method_channel.dart';

deprecated/flutter_multi_window/lib/src/new_window/web.dart

@@ -10,17 +10,9 @@ void newWindow(
 }) {
   final screen = html.window.screen;
   double top = 0;
-  if (dy != null) {
-    top = dy;
-  } else if (screen.height != null) {
-    top = (screen.height - height) / 2;
-  }
+  top = dy;
   double left = 0;
-  if (dx != null) {
-    left = dx;
-  } else if (screen.width != null) {
-    left = (screen.width - width) / 2;
-  }
+  left = dx;
   final sb = StringBuffer();
   sb.write("height=");
   sb.write(height);

deprecated/flutter_multi_window/lib/src/window.dart

@@ -64,8 +64,6 @@ class NewWindow {
   }
 
   static NewWindow fromMap(Map<String, dynamic> map) {
-    if (map == null) return null;
-
     return NewWindow(
       url: map['url'],
       width: map['width'],
@@ -114,8 +112,8 @@ void createWindow(NewWindow window) {
     window.url,
     window.width,
     window.height,
-    dx: window?.offsetX,
-    dy: window?.offsetY,
-    name: window?.name,
+    dx: window.offsetX,
+    dy: window.offsetY,
+    name: window.name,
   );
 }

deprecated/flutter_multi_window/main.dart

@@ -84,10 +84,10 @@ class _MyAppState extends State<MyApp> {
     final height = size.height;
     final width = size.width;
     final sb = StringBuffer();
-    final top = offset?.dy ??
+    final top = offset.dy ??
         (screen.height != null ? (screen.height - height) / 2 : 0);
     final left =
-        offset?.dx ?? (screen.width != null ? (screen.width - width) / 2 : 0);
+        offset.dx ?? (screen.width != null ? (screen.width - width) / 2 : 0);
     sb.write("height=");
     sb.write(height);
     sb.write(",width=");

deprecated/flutter_wasm_interop/example/lib/main.dart

@@ -62,7 +62,7 @@ class _MyHomePageState extends State<MyHomePage> {
             ),
             Text(
               '$_counter',
-              style: Theme.of(context).textTheme.headline4,
+              style: Theme.of(context).textTheme.headlineMedium,
             ),
           ],
         ),

deprecated/flutter_wasm_interop/lib/src/web.dart

@@ -32,7 +32,6 @@ class WasmLoader extends WasmImpl {
 
   @override
   Future<bool> init() async {
-    assert(_path != null);
     final _data = await rootBundle.load(_path);
     _wasm = await Instance.fromBufferAsync(_data.buffer);
     return isReady;

deprecated/get_version/example/lib/main.dart

@@ -26,9 +26,7 @@ void _setTargetPlatformForDesktop() {
   } else if (Platform.isLinux || Platform.isWindows) {
     targetPlatform = TargetPlatform.android;
   }
-  if (targetPlatform != null) {
-    debugDefaultTargetPlatformOverride = targetPlatform;
-  }
+  debugDefaultTargetPlatformOverride = targetPlatform;
 }
 
 class MyApp extends StatefulWidget {

deprecated/golden_layout/example/lib/main.dart

@@ -12,9 +12,7 @@ class MyApp extends StatelessWidget {
       debugShowCheckedModeBanner: false,
       title: 'Flutter Demo',
       theme: ThemeData(
-        primarySwatch: Colors.blue,
-        accentColor: Colors.red,
-        visualDensity: VisualDensity.adaptivePlatformDensity,
+        visualDensity: VisualDensity.adaptivePlatformDensity, colorScheme: ColorScheme.fromSwatch(primarySwatch: Colors.blue).copyWith(secondary: Colors.red),
       ),
       home: MyHomePage(title: 'Flutter Golden Layout'),
     );
@@ -88,7 +86,7 @@ class _MyHomePageState extends State<MyHomePage> {
       ),
       body: GoldenLayoutTheme(
         data: GoldenLayoutThemeData(
-          tabSelectedBackgroundColor: Theme.of(context).accentColor,
+          tabSelectedBackgroundColor: Theme.of(context).colorScheme.secondary,
         ),
         child: GoldenLayout(
           controller: _controller,
@@ -103,7 +101,7 @@ class _MyHomePageState extends State<MyHomePage> {
         title: (context, selected, index) => Text(
               'Window $count',
               style: TextStyle(
-                color: selected ? Theme.of(context).accentColor : Colors.white,
+                color: selected ? Theme.of(context).colorScheme.secondary : Colors.white,
               ),
             ),
         child: Container(color: Colors.red[100 * count]));

deprecated/golden_layout/lib/golden_layout.dart

@@ -34,55 +34,51 @@ class _GoldenLayoutState extends State<GoldenLayout> {
 
   @override
   void initState() {
-    _controller = widget?.controller ?? WindowController();
-    if (widget?.collection != null) {
-      _controller.base = widget.collection;
-    }
-    super.initState();
+    _controller = widget.controller ?? WindowController();
+    _controller.base = widget.collection;
+      super.initState();
   }
 
   @override
   Widget build(BuildContext context) {
     return LayoutBuilder(builder: (context, dimens) {
-      if (_controller.fullScreen != null) {
-        return RenderWindowGroup(
-          onAddTab: widget.onAddTab,
-          onCancel: (val) {
-            _controller.addToBase(val);
-          },
-          isDragging: _isDragging,
-          onDraggingChanged: (val) {
-            if (mounted) {
-              setState(() {
-                _isDragging = val;
-              });
-            }
-          },
-          popUpSize: widget.popupSize,
-          minimize: true,
-          group: _controller.fullScreen,
-          onFullScreen: () {
-            if (mounted) {
-              setState(() {
-                _controller.exitFullScreen();
-              });
-            }
-          },
-          onClose: !_controller.fullScreen.canClose
-              ? null
-              : () {
-                  if (mounted) {
-                    setState(() {
-                      _controller.exitFullScreen(true);
-                    });
-                  }
-                },
-          update: () {
-            if (mounted) setState(() {});
-          },
-        );
-      }
-      return _renderItem(
+      return RenderWindowGroup(
+        onAddTab: widget.onAddTab,
+        onCancel: (val) {
+          _controller.addToBase(val);
+        },
+        isDragging: _isDragging,
+        onDraggingChanged: (val) {
+          if (mounted) {
+            setState(() {
+              _isDragging = val;
+            });
+          }
+        },
+        popUpSize: widget.popupSize,
+        minimize: true,
+        group: _controller.fullScreen,
+        onFullScreen: () {
+          if (mounted) {
+            setState(() {
+              _controller.exitFullScreen();
+            });
+          }
+        },
+        onClose: !_controller.fullScreen.canClose
+            ? null
+            : () {
+                if (mounted) {
+                  setState(() {
+                    _controller.exitFullScreen(true);
+                  });
+                }
+              },
+        update: () {
+          if (mounted) setState(() {});
+        },
+      );
+          return _renderItem(
         _controller.base,
         index: 0,
         size: Size(dimens.maxWidth, dimens.maxHeight),

deprecated/golden_layout/lib/src/border_accept.dart

@@ -27,7 +27,7 @@ class _WindowAcceptRegionState extends State<WindowAcceptRegion> {
   @override
   Widget build(BuildContext context) {
     return SizedBox.fromSize(
-      size: widget?.size,
+      size: widget.size,
       child: LayoutBuilder(
         builder: (context, dimens) => Stack(
           fit: StackFit.expand,
@@ -42,22 +42,22 @@ class _WindowAcceptRegionState extends State<WindowAcceptRegion> {
               ),
             ),
             Positioned.fill(
-              left: widget?.left ?? 0,
-              right: widget?.right ?? 0,
-              top: widget?.top ?? 0,
-              bottom: widget?.bottom ?? 0,
+              left: widget.left ?? 0,
+              right: widget.right ?? 0,
+              top: widget.top ?? 0,
+              bottom: widget.bottom ?? 0,
               child: Container(
                 child: DragTarget<WindowTab>(
                   builder: (context, accepted, rejected) => Container(),
-                  onAccept: (val) {
+                  onAcceptWithDetails: (val) {
                     if (mounted) {
                       setState(() {
                         accepting = false;
                       });
                     }
-                    if (widget.onAccept != null) widget.onAccept(val);
+                    widget.onAccept(val);
                   },
-                  onWillAccept: (val) {
+                  onWillAcceptWithDetails: (val) {
                     if (mounted) {
                       setState(() {
                         accepting = true;

deprecated/golden_layout/lib/src/controller.dart

@@ -24,12 +24,8 @@ class WindowController extends ChangeNotifier {
   WindowCollection base = WindowColumn([]);
 
   void addToBase(WindowTab tab) {
-    if (base == null) {
-      base = WindowColumn([WindowGroup(tab)]);
-    } else {
-      _addTab(base, tab);
-    }
-    notifyListeners();
+    _addTab(base, tab);
+      notifyListeners();
   }
 
   bool _addTab(WindowCollection item, WindowTab tab) {

deprecated/golden_layout/lib/src/window.dart

@@ -36,7 +36,7 @@ class WindowColumn extends WindowCollection {
 
 class WindowGroup extends WindowCollection {
   WindowGroup([WindowTab tab, bool closeable = true]) {
-    if (tab != null) _tabs.add(tab);
+    _tabs.add(tab);
     canClose = closeable;
   }
   bool canClose = true;
@@ -56,14 +56,9 @@ class WindowGroup extends WindowCollection {
   }
 
   void addTab(WindowTab tab, [int index]) {
-    if (index != null) {
-      _tabs.insert(index, tab);
-      _activeTab = index;
-    } else {
-      _tabs.add(tab);
-      _activeTab = _tabs.length - 1;
-    }
-    notifyListeners();
+    _tabs.insert(index, tab);
+    _activeTab = index;
+      notifyListeners();
   }
 
   void removeTab(WindowTab tab) {

deprecated/golden_layout/lib/src/window_group.dart

@@ -54,11 +54,11 @@ class _RenderWindowGroupState extends State<RenderWindowGroup> {
   @override
   Widget build(BuildContext context) {
     final _theme =
-        GoldenLayoutTheme.of(context)?.theme ?? GoldenLayoutThemeData();
+        GoldenLayoutTheme.of(context).theme ?? GoldenLayoutThemeData();
     return Column(
       children: [
         Container(
-          color: _theme?.backgroundColor,
+          color: _theme.backgroundColor,
           height: 32,
           child: Row(
             children: [
@@ -72,13 +72,12 @@ class _RenderWindowGroupState extends State<RenderWindowGroup> {
                       for (var i = 0; i < widget.group.tabs.length; i++)
                         Draggable<WindowTab>(
                           data: widget.group.tabs[i],
-                          dragAnchor: DragAnchor.child,
                           onDragStarted: () {
                             _draggingTab = widget.group.tabs[i];
                             widget.group.removeTab(_draggingTab);
                             widget.update();
                             if (widget.group.tabs.isEmpty) {
-                              widget.onClose?.call();
+                              widget.onClose.call();
                             }
                             widget.onDraggingChanged(true);
                           },
@@ -128,7 +127,7 @@ class _RenderWindowGroupState extends State<RenderWindowGroup> {
                                 });
                               }
                             },
-                            onWillAccept: (val) {
+                            onWillAcceptWithDetails: (val) {
                               if (mounted) {
                                 setState(() {
                                   accepting = i;
@@ -136,7 +135,7 @@ class _RenderWindowGroupState extends State<RenderWindowGroup> {
                               }
                               return true;
                             },
-                            onAccept: (val) {
+                            onAcceptWithDetails: (val) {
                               widget.onModify(
                                   context, val, WindowPos.tab, accepting);
                               if (mounted) {
@@ -155,9 +154,9 @@ class _RenderWindowGroupState extends State<RenderWindowGroup> {
                                 child: Container(
                                   decoration: BoxDecoration(
                                     color: selected
-                                        ? _theme?.tabSelectedBackgroundColor ??
+                                        ? _theme.tabSelectedBackgroundColor ??
                                             Colors.grey.shade600
-                                        : _theme?.backgroundColor,
+                                        : _theme.backgroundColor,
                                     borderRadius: selected
                                         ? BorderRadius.only(
                                             topLeft: Radius.circular(5),
@@ -197,17 +196,17 @@ class _RenderWindowGroupState extends State<RenderWindowGroup> {
                                           child: Icon(
                                             Icons.close,
                                             size: 18,
-                                            color: _theme?.tabIconColor ??
+                                            color: _theme.tabIconColor ??
                                                 Colors.white,
                                           ),
                                           onTap: () {
                                             widget.group.tabs[i].onClose
-                                                ?.call();
+                                                .call();
                                             widget.group.removeTab(
                                                 widget.group.tabs[i]);
                                             widget.update();
                                             if (widget.group.tabs.isEmpty) {
-                                              widget.onClose?.call();
+                                              widget.onClose.call();
                                             }
                                           },
                                         ),
@@ -225,17 +224,16 @@ class _RenderWindowGroupState extends State<RenderWindowGroup> {
                                 ),
                               );
                             },
-                          ),
+                          ), dragAnchorStrategy: childDragAnchorStrategy,
                         ),
-                      if (widget.onAddTab != null)
-                        IconButton(
-                            iconSize: 20,
-                            icon: Icon(
-                              Icons.add,
-                              color: Colors.white,
-                            ),
-                            onPressed: () =>
-                                widget.group.addTab(widget.onAddTab())),
+                      IconButton(
+                          iconSize: 20,
+                          icon: Icon(
+                            Icons.add,
+                            color: Colors.white,
+                          ),
+                          onPressed: () =>
+                              widget.group.addTab(widget.onAddTab())),
                       if (widget.isDragging)
                         WindowAcceptRegion(
                           size: Size(100, 32),
@@ -249,18 +247,17 @@ class _RenderWindowGroupState extends State<RenderWindowGroup> {
                 ),
               ),
               IconButton(
-                color: _theme?.tabIconColor ?? Colors.white,
+                color: _theme.tabIconColor ?? Colors.white,
                 iconSize: 18,
                 icon: Icon(widget.minimize ? Icons.minimize : Icons.fullscreen),
                 onPressed: widget.onFullScreen,
               ),
-              if (widget.onClose != null)
-                IconButton(
-                  color: _theme?.tabIconColor ?? Colors.white,
-                  iconSize: 18,
-                  icon: Icon(Icons.close),
-                  onPressed: widget.onClose,
-                ),
+              IconButton(
+                color: _theme.tabIconColor ?? Colors.white,
+                iconSize: 18,
+                icon: Icon(Icons.close),
+                onPressed: widget.onClose,
+              ),
             ],
           ),
         ),

deprecated/image_resizer/example/lib/main.dart

@@ -17,8 +17,7 @@ class MyApp extends StatelessWidget {
       debugShowCheckedModeBanner: false,
       title: 'Flutter Icon Resizer',
       theme: ThemeData.light().copyWith(
-        primaryColor: Colors.blue,
-        accentColor: Colors.red,
+        primaryColor: Colors.blue, colorScheme: ColorScheme.fromSwatch().copyWith(secondary: Colors.red),
       ),
       darkTheme: ThemeData.dark(),
       home: HomeScreen(),
@@ -179,10 +178,8 @@ class _HomeScreenState extends State<HomeScreen> {
     if (kIsWeb) {
       Uri dataUrl;
       try {
-        if (binaryData != null) {
-          dataUrl = Uri.dataFromBytes(binaryData);
-        }
-      } catch (e) {
+        dataUrl = Uri.dataFromBytes(binaryData);
+            } catch (e) {
         if (!silentErrors) {
           throw Exception("Error Creating File Data: $e");
         }
@@ -315,7 +312,7 @@ class _HomeScreenState extends State<HomeScreen> {
             SwitchListTile(
               title: Text(
                 'Export $name Icons',
-                style: Theme.of(context).textTheme.headline4,
+                style: Theme.of(context).textTheme.headlineMedium,
               ),
               value: toggle,
               onChanged: onChanged,
@@ -338,27 +335,27 @@ class _HomeScreenState extends State<HomeScreen> {
               DataTable(
                 columns: [
                   DataColumn(label: Text('Size')),
-                  if (icons is List<IosIcon>) ...[
-                    DataColumn(label: Text('Prefix')),
-                    DataColumn(label: Text('Ext')),
-                    DataColumn(label: Text('Scale')),
-                    DataColumn(label: Text('Point5')),
-                  ],
-                  if (icons is List<MacOSIcon>) ...[
-                    DataColumn(label: Text('Prefix')),
-                    DataColumn(label: Text('Ext')),
-                    DataColumn(label: Text('Scale')),
-                  ],
-                  if (icons is List<WebIcon>) ...[
-                    DataColumn(label: Text('Prefix')),
-                    DataColumn(label: Text('Ext')),
-                  ],
-                  if (icons is List<AndroidIcon>) ...[
-                    DataColumn(label: Text('Name')),
-                    DataColumn(label: Text('Folder')),
-                    DataColumn(label: Text('Suffix')),
-                    DataColumn(label: Text('Ext')),
-                  ],
+                  ...[
+                  DataColumn(label: Text('Prefix')),
+                  DataColumn(label: Text('Ext')),
+                  DataColumn(label: Text('Scale')),
+                  DataColumn(label: Text('Point5')),
+                ],
+                  ...[
+                  DataColumn(label: Text('Prefix')),
+                  DataColumn(label: Text('Ext')),
+                  DataColumn(label: Text('Scale')),
+                ],
+                  ...[
+                  DataColumn(label: Text('Prefix')),
+                  DataColumn(label: Text('Ext')),
+                ],
+                  ...[
+                  DataColumn(label: Text('Name')),
+                  DataColumn(label: Text('Folder')),
+                  DataColumn(label: Text('Suffix')),
+                  DataColumn(label: Text('Ext')),
+                ],
                   DataColumn(label: Text('Delete')),
                 ],
                 rows: [
@@ -396,258 +393,258 @@ class _HomeScreenState extends State<HomeScreen> {
                           ),
                         ),
                       ),
-                      if (icons is List<IosIcon>) ...[
-                        DataCell(
-                          SizedBox(
-                            width: 100,
-                            child: TextFormField(
-                              decoration: InputDecoration.collapsed(
-                                hintText: 'Prefix',
-                              ),
-                              initialValue: icons[i].prefix,
-                              onChanged: (val) {
-                                try {
-                                  if (mounted)
-                                    setState(() {
-                                      icons[i] = icons[i].copyWith(prefix: val);
-                                    });
-                                } catch (e) {}
-                              },
+                      ...[
+                      DataCell(
+                        SizedBox(
+                          width: 100,
+                          child: TextFormField(
+                            decoration: InputDecoration.collapsed(
+                              hintText: 'Prefix',
                             ),
-                          ),
-                        ),
-                        DataCell(
-                          SizedBox(
-                            width: 100,
-                            child: TextFormField(
-                              decoration: InputDecoration.collapsed(
-                                hintText: 'Ext',
-                              ),
-                              initialValue: icons[i].ext,
-                              onChanged: (val) {
-                                try {
-                                  if (mounted)
-                                    setState(() {
-                                      icons[i] = icons[i].copyWith(ext: val);
-                                    });
-                                } catch (e) {}
-                              },
-                            ),
-                          ),
-                        ),
-                        DataCell(
-                          SizedBox(
-                            width: 100,
-                            child: TextFormField(
-                              decoration: InputDecoration.collapsed(
-                                hintText: 'Scale',
-                              ),
-                              initialValue: icons[i].scale.toString(),
-                              onChanged: (val) {
-                                try {
-                                  if (mounted)
-                                    setState(() {
-                                      final _value = int.tryParse(val);
-                                      icons[i] =
-                                          icons[i].copyWith(scale: _value);
-                                    });
-                                } catch (e) {}
-                              },
-                            ),
-                          ),
-                        ),
-                        DataCell(
-                          Switch(
-                            value: icons[i].point5,
+                            initialValue: icons[i].prefix,
                             onChanged: (val) {
-                              if (mounted)
-                                setState(() {
-                                  icons[i] = icons[i].copyWith(point5: val);
-                                });
+                              try {
+                                if (mounted)
+                                  setState(() {
+                                    icons[i] = icons[i].copyWith(prefix: val);
+                                  });
+                              } catch (e) {}
                             },
                           ),
                         ),
-                      ],
-                      if (icons is List<MacOSIcon>) ...[
-                        DataCell(
-                          SizedBox(
-                            width: 100,
-                            child: TextFormField(
-                              decoration: InputDecoration.collapsed(
-                                hintText: 'Prefix',
-                              ),
-                              initialValue: icons[i].prefix,
-                              onChanged: (val) {
-                                try {
-                                  if (mounted)
-                                    setState(() {
-                                      icons[i] = icons[i].copyWith(prefix: val);
-                                    });
-                                } catch (e) {}
-                              },
+                      ),
+                      DataCell(
+                        SizedBox(
+                          width: 100,
+                          child: TextFormField(
+                            decoration: InputDecoration.collapsed(
+                              hintText: 'Ext',
                             ),
+                            initialValue: icons[i].ext,
+                            onChanged: (val) {
+                              try {
+                                if (mounted)
+                                  setState(() {
+                                    icons[i] = icons[i].copyWith(ext: val);
+                                  });
+                              } catch (e) {}
+                            },
                           ),
                         ),
-                        DataCell(
-                          SizedBox(
-                            width: 100,
-                            child: TextFormField(
-                              decoration: InputDecoration.collapsed(
-                                hintText: 'Ext',
-                              ),
-                              initialValue: icons[i].ext,
-                              onChanged: (val) {
-                                try {
-                                  if (mounted)
-                                    setState(() {
-                                      icons[i] = icons[i].copyWith(ext: val);
-                                    });
-                                } catch (e) {}
-                              },
+                      ),
+                      DataCell(
+                        SizedBox(
+                          width: 100,
+                          child: TextFormField(
+                            decoration: InputDecoration.collapsed(
+                              hintText: 'Scale',
                             ),
+                            initialValue: icons[i].scale.toString(),
+                            onChanged: (val) {
+                              try {
+                                if (mounted)
+                                  setState(() {
+                                    final _value = int.tryParse(val);
+                                    icons[i] =
+                                        icons[i].copyWith(scale: _value);
+                                  });
+                              } catch (e) {}
+                            },
                           ),
                         ),
-                        DataCell(
-                          SizedBox(
-                            width: 100,
-                            child: TextFormField(
-                              decoration: InputDecoration.collapsed(
-                                hintText: 'Scale',
-                              ),
-                              initialValue: icons[i].scale.toString(),
-                              onChanged: (val) {
-                                try {
-                                  if (mounted)
-                                    setState(() {
-                                      final _value = int.tryParse(val);
-                                      icons[i] =
-                                          icons[i].copyWith(scale: _value);
-                                    });
-                                } catch (e) {}
-                              },
+                      ),
+                      DataCell(
+                        Switch(
+                          value: icons[i].point5,
+                          onChanged: (val) {
+                            if (mounted)
+                              setState(() {
+                                icons[i] = icons[i].copyWith(point5: val);
+                              });
+                          },
+                        ),
+                      ),
+                    ],
+                      ...[
+                      DataCell(
+                        SizedBox(
+                          width: 100,
+                          child: TextFormField(
+                            decoration: InputDecoration.collapsed(
+                              hintText: 'Prefix',
                             ),
+                            initialValue: icons[i].prefix,
+                            onChanged: (val) {
+                              try {
+                                if (mounted)
+                                  setState(() {
+                                    icons[i] = icons[i].copyWith(prefix: val);
+                                  });
+                              } catch (e) {}
+                            },
                           ),
                         ),
-                      ],
-                      if (icons is List<WebIcon>) ...[
-                        DataCell(
-                          SizedBox(
-                            width: 100,
-                            child: TextFormField(
-                              decoration: InputDecoration.collapsed(
-                                hintText: 'Prefix',
-                              ),
-                              initialValue: icons[i].prefix,
-                              onChanged: (val) {
-                                try {
-                                  if (mounted)
-                                    setState(() {
-                                      icons[i] = icons[i].copyWith(prefix: val);
-                                    });
-                                } catch (e) {}
-                              },
+                      ),
+                      DataCell(
+                        SizedBox(
+                          width: 100,
+                          child: TextFormField(
+                            decoration: InputDecoration.collapsed(
+                              hintText: 'Ext',
                             ),
+                            initialValue: icons[i].ext,
+                            onChanged: (val) {
+                              try {
+                                if (mounted)
+                                  setState(() {
+                                    icons[i] = icons[i].copyWith(ext: val);
+                                  });
+                              } catch (e) {}
+                            },
                           ),
                         ),
-                        DataCell(
-                          SizedBox(
-                            width: 100,
-                            child: TextFormField(
-                              decoration: InputDecoration.collapsed(
-                                hintText: 'Ext',
-                              ),
-                              initialValue: icons[i].ext,
-                              onChanged: (val) {
-                                try {
-                                  if (mounted)
-                                    setState(() {
-                                      icons[i] = icons[i].copyWith(ext: val);
-                                    });
-                                } catch (e) {}
-                              },
+                      ),
+                      DataCell(
+                        SizedBox(
+                          width: 100,
+                          child: TextFormField(
+                            decoration: InputDecoration.collapsed(
+                              hintText: 'Scale',
                             ),
+                            initialValue: icons[i].scale.toString(),
+                            onChanged: (val) {
+                              try {
+                                if (mounted)
+                                  setState(() {
+                                    final _value = int.tryParse(val);
+                                    icons[i] =
+                                        icons[i].copyWith(scale: _value);
+                                  });
+                              } catch (e) {}
+                            },
                           ),
                         ),
-                      ],
-                      if (icons is List<AndroidIcon>) ...[
-                        DataCell(
-                          SizedBox(
-                            width: 100,
-                            child: TextFormField(
-                              decoration: InputDecoration.collapsed(
-                                hintText: 'Name',
-                              ),
-                              initialValue: icons[i].name,
-                              onChanged: (val) {
-                                try {
-                                  if (mounted)
-                                    setState(() {
-                                      icons[i] = icons[i].copyWith(name: val);
-                                    });
-                                } catch (e) {}
-                              },
+                      ),
+                    ],
+                      ...[
+                      DataCell(
+                        SizedBox(
+                          width: 100,
+                          child: TextFormField(
+                            decoration: InputDecoration.collapsed(
+                              hintText: 'Prefix',
                             ),
+                            initialValue: icons[i].prefix,
+                            onChanged: (val) {
+                              try {
+                                if (mounted)
+                                  setState(() {
+                                    icons[i] = icons[i].copyWith(prefix: val);
+                                  });
+                              } catch (e) {}
+                            },
                           ),
                         ),
-                        DataCell(
-                          SizedBox(
-                            width: 100,
-                            child: TextFormField(
-                              decoration: InputDecoration.collapsed(
-                                hintText: 'Folder',
-                              ),
-                              initialValue: icons[i].folder,
-                              onChanged: (val) {
-                                try {
-                                  if (mounted)
-                                    setState(() {
-                                      icons[i] = icons[i].copyWith(folder: val);
-                                    });
-                                } catch (e) {}
-                              },
+                      ),
+                      DataCell(
+                        SizedBox(
+                          width: 100,
+                          child: TextFormField(
+                            decoration: InputDecoration.collapsed(
+                              hintText: 'Ext',
                             ),
+                            initialValue: icons[i].ext,
+                            onChanged: (val) {
+                              try {
+                                if (mounted)
+                                  setState(() {
+                                    icons[i] = icons[i].copyWith(ext: val);
+                                  });
+                              } catch (e) {}
+                            },
                           ),
                         ),
-                        DataCell(
-                          SizedBox(
-                            width: 100,
-                            child: TextFormField(
-                              decoration: InputDecoration.collapsed(
-                                hintText: 'Suffix',
-                              ),
-                              initialValue: icons[i].folderSuffix,
-                              onChanged: (val) {
-                                try {
-                                  if (mounted)
-                                    setState(() {
-                                      icons[i] =
-                                          icons[i].copyWith(folderSuffix: val);
-                                    });
-                                } catch (e) {}
-                              },
+                      ),
+                    ],
+                      ...[
+                      DataCell(
+                        SizedBox(
+                          width: 100,
+                          child: TextFormField(
+                            decoration: InputDecoration.collapsed(
+                              hintText: 'Name',
                             ),
+                            initialValue: icons[i].name,
+                            onChanged: (val) {
+                              try {
+                                if (mounted)
+                                  setState(() {
+                                    icons[i] = icons[i].copyWith(name: val);
+                                  });
+                              } catch (e) {}
+                            },
                           ),
                         ),
-                        DataCell(
-                          SizedBox(
-                            width: 100,
-                            child: TextFormField(
-                              decoration: InputDecoration.collapsed(
-                                hintText: 'Ext',
-                              ),
-                              initialValue: icons[i].ext,
-                              onChanged: (val) {
-                                try {
-                                  if (mounted)
-                                    setState(() {
-                                      icons[i] = icons[i].copyWith(ext: val);
-                                    });
-                                } catch (e) {}
-                              },
+                      ),
+                      DataCell(
+                        SizedBox(
+                          width: 100,
+                          child: TextFormField(
+                            decoration: InputDecoration.collapsed(
+                              hintText: 'Folder',
                             ),
+                            initialValue: icons[i].folder,
+                            onChanged: (val) {
+                              try {
+                                if (mounted)
+                                  setState(() {
+                                    icons[i] = icons[i].copyWith(folder: val);
+                                  });
+                              } catch (e) {}
+                            },
                           ),
                         ),
-                      ],
+                      ),
+                      DataCell(
+                        SizedBox(
+                          width: 100,
+                          child: TextFormField(
+                            decoration: InputDecoration.collapsed(
+                              hintText: 'Suffix',
+                            ),
+                            initialValue: icons[i].folderSuffix,
+                            onChanged: (val) {
+                              try {
+                                if (mounted)
+                                  setState(() {
+                                    icons[i] =
+                                        icons[i].copyWith(folderSuffix: val);
+                                  });
+                              } catch (e) {}
+                            },
+                          ),
+                        ),
+                      ),
+                      DataCell(
+                        SizedBox(
+                          width: 100,
+                          child: TextFormField(
+                            decoration: InputDecoration.collapsed(
+                              hintText: 'Ext',
+                            ),
+                            initialValue: icons[i].ext,
+                            onChanged: (val) {
+                              try {
+                                if (mounted)
+                                  setState(() {
+                                    icons[i] = icons[i].copyWith(ext: val);
+                                  });
+                              } catch (e) {}
+                            },
+                          ),
+                        ),
+                      ),
+                    ],
                       DataCell(
                         IconButton(
                           icon: Icon(Icons.delete),
@@ -668,39 +665,31 @@ class _HomeScreenState extends State<HomeScreen> {
                 onPressed: () {
                   if (mounted)
                     setState(() {
-                      if (icons is List<IosIcon>) {
-                        icons.add(
-                          IosIcon(
-                            size: 1024,
-                            scale: 1,
-                          ),
-                        );
-                      }
-                      if (icons is List<WebIcon>) {
-                        icons.add(
-                          WebIcon(
-                            size: 192,
-                          ),
-                        );
-                      }
-                      if (icons is List<MacOSIcon>) {
-                        icons.add(
-                          MacOSIcon(
-                            size: 512,
-                            scale: 2,
-                            name: '1024',
-                          ),
-                        );
-                      }
-                      if (icons is List<AndroidIcon>) {
-                        icons.add(
-                          AndroidIcon(
-                            size: 192,
-                            folderSuffix: "xxxhdpi",
-                          ),
-                        );
-                      }
-                    });
+                      icons.add(
+                        IosIcon(
+                          size: 1024,
+                          scale: 1,
+                        ),
+                      );
+                                          icons.add(
+                        WebIcon(
+                          size: 192,
+                        ),
+                      );
+                                          icons.add(
+                        MacOSIcon(
+                          size: 512,
+                          scale: 2,
+                          name: '1024',
+                        ),
+                      );
+                                          icons.add(
+                        AndroidIcon(
+                          size: 192,
+                          folderSuffix: "xxxhdpi",
+                        ),
+                      );
+                                        });
                 },
               ),
             ],
@@ -711,9 +700,6 @@ class _HomeScreenState extends State<HomeScreen> {
   }
 
   Widget _buildFilePreview() {
-    if (_files == null) {
-      return Center(child: CircularProgressIndicator());
-    }
     return ListView.separated(
       separatorBuilder: (context, index) => Container(
         height: 1.0,
@@ -729,7 +715,7 @@ class _HomeScreenState extends State<HomeScreen> {
             children: <Widget>[
               Text(
                 _key,
-                style: Theme.of(context).textTheme.headline4,
+                style: Theme.of(context).textTheme.headlineMedium,
               ),
               Padding(
                 padding: const EdgeInsets.all(8.0),

deprecated/image_resizer/lib/src/template.dart

@@ -1,4 +1,3 @@
-import 'dart:convert';
 
 import 'package:meta/meta.dart';
 

deprecated/mobile_popup/example/lib/main.dart

@@ -21,9 +21,7 @@ void _setTargetPlatformForDesktop() {
   } else if (Platform.isLinux || Platform.isWindows) {
     targetPlatform = TargetPlatform.android;
   }
-  if (targetPlatform != null) {
-    debugDefaultTargetPlatformOverride = targetPlatform;
-  }
+  debugDefaultTargetPlatformOverride = targetPlatform;
 }
 
 class MyApp extends StatefulWidget {

deprecated/mobile_popup/lib/mobile_popup.dart

@@ -77,7 +77,7 @@ class _MobilePopUpState extends State<MobilePopUp> {
   void init() {
     if (mounted)
       setState(() {
-        leadingColor = widget?.leadingColor;
+        leadingColor = widget.leadingColor;
       });
   }
 
@@ -88,10 +88,10 @@ class _MobilePopUpState extends State<MobilePopUp> {
         _size.height < widget.breakpoint.height;
     final _full = _mobile || fullscreen;
     final _content = _PopUpContent(
-      title: widget?.title,
+      title: widget.title,
       showDoneButton: widget.showDoneButton,
-      child: widget?.child,
-      routes: widget?.routes,
+      child: widget.child,
+      routes: widget.routes,
       leadingColor: leadingColor,
       fullscreen: !widget.showFullScreen ? null : fullscreen,
       toggleFullscreen: (value) {
@@ -155,14 +155,13 @@ class _PopUpContent extends StatelessWidget {
                 )
               : null,
           actions: <Widget>[
-            if (fullscreen != null)
-              IconButton(
-                icon:
-                    Icon(fullscreen ? Icons.fullscreen_exit : Icons.fullscreen),
-                onPressed: () => toggleFullscreen(!fullscreen),
-              )
+            IconButton(
+              icon:
+                  Icon(fullscreen ? Icons.fullscreen_exit : Icons.fullscreen),
+              onPressed: () => toggleFullscreen(!fullscreen),
+            )
           ],
-          title: title == null ? null : Text(title),
+          title: Text(title),
         ),
         body: child,
       ),

deprecated/mobile_popup/lib/pop_up.dart

@@ -23,7 +23,7 @@ Future<T> showMobilePopup<T>({
         Animation<double> secondaryAnimation) {
       final Widget pageChild = Builder(builder: builder);
       return Builder(builder: (BuildContext context) {
-        return theme != null ? Theme(data: theme, child: pageChild) : pageChild;
+        return Theme(data: theme, child: pageChild);
       });
     },
     barrierDismissible: barrierDismissible,

deprecated/mobile_sidebar/example/lib/main.dart

@@ -151,9 +151,6 @@ class FancyTitle extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
-    if (logo == null) {
-      return logo;
-    }
     return Row(
       children: <Widget>[
         logo,

deprecated/mobile_sidebar/lib/mobile_sidebar.dart

@@ -1,9 +1,6 @@
-import 'dart:math';
 
 import 'package:auto_size_text/auto_size_text.dart';
-import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
-import 'package:flutter/rendering.dart';
 
 class TabChild {
   final String title;
@@ -72,15 +69,13 @@ class MobileSidebar extends StatelessWidget {
         return Scaffold(
           key: _scaffoldKey,
           drawer: _showDrawer
-              ? drawerBuilder != null
-                  ? drawerBuilder(context, _titles, onTabChanged)
-                  : _buildDrawer(context, _titles)
+              ? drawerBuilder(context, _titles, onTabChanged)
               : null,
           appBar: PreferredSize(
             preferredSize: Size.fromHeight(kToolbarHeight),
             child: Material(
               color: theme.appBarTheme.color,
-              elevation: theme.appBarTheme?.elevation ?? 4.0,
+              elevation: theme.appBarTheme.elevation ?? 4.0,
               child: Row(
                 mainAxisAlignment: MainAxisAlignment.spaceBetween,
                 children: <Widget>[
@@ -187,8 +182,8 @@ class MobileSidebar extends StatelessWidget {
                         if (showSearchButton) ...[
                           _searchBuilder(context, _showDrawer),
                         ],
-                        if (ctaBuilder != null) ctaBuilder(context),
-                        if (accountBuilder != null) accountBuilder(context),
+                        ctaBuilder(context),
+                        accountBuilder(context),
                       ],
                     ),
                   ],
@@ -216,7 +211,7 @@ class MobileSidebar extends StatelessWidget {
               child: Center(
                 child: AutoSizeText(
                   tab,
-                  style: theme.textTheme.body2.copyWith(
+                  style: theme.textTheme.bodyLarge.copyWith(
                     color: Colors.black,
                   ),
                 ),
@@ -227,7 +222,7 @@ class MobileSidebar extends StatelessWidget {
               height: kBarHeight,
               width: tabWidth * 2,
               color: tab == _titles[currentIndex]
-                  ? theme.accentColor
+                  ? theme.colorScheme.secondary
                   : Colors.transparent,
             ),
           ],
@@ -239,10 +234,8 @@ class MobileSidebar extends StatelessWidget {
   final kBarHeight = 3.0;
 
   Widget _menuIconBuilder(BuildContext context) {
-    if (menuButtonBuilder != null) {
-      return menuButtonBuilder(context);
-    }
-    return IconButton(
+    return menuButtonBuilder(context);
+      return IconButton(
       icon: Icon(Icons.menu),
       onPressed: () => _scaffoldKey.currentState.openDrawer(),
     );
@@ -250,22 +243,16 @@ class MobileSidebar extends StatelessWidget {
 
   Widget _searchBuilder(BuildContext context, bool showDrawer) {
     if (showDrawer) {
-      if (searchIconBuilder != null) {
-        return searchIconBuilder(context);
-      }
-      return IconButton(
+      return searchIconBuilder(context);
+          return IconButton(
         icon: Icon(Icons.search),
         onPressed: () {
-          if (isSearchChanged != null) {
-            isSearchChanged(!isSearching);
-          }
-        },
+          isSearchChanged(!isSearching);
+                },
       );
     }
-    if (searchBarBuilder != null) {
-      return searchBarBuilder(context, searchChanged);
-    }
-    const kSearchBarWidth = 225.0;
+    return searchBarBuilder(context, searchChanged);
+      const kSearchBarWidth = 225.0;
 
     return Container(
       width: kSearchBarWidth,
@@ -289,10 +276,8 @@ class MobileSidebar extends StatelessWidget {
           onTap: isSearching
               ? null
               : () {
-                  if (isSearchChanged != null) {
-                    isSearchChanged(!isSearching);
-                  }
-                },
+                  isSearchChanged(!isSearching);
+                                },
         ),
       ),
     );
@@ -345,10 +330,10 @@ class MobileSidebar extends StatelessWidget {
                 ],
               ),
               _divider,
-              if (ctaBuilder != null) ...[
-                ctaBuilder(context),
-                _divider,
-              ],
+              ...[
+              ctaBuilder(context),
+              _divider,
+            ],
             ],
           ),
         ),

deprecated/navigation_rail/example/lib/main.dart

@@ -10,7 +10,7 @@ class MyApp extends StatelessWidget {
       debugShowCheckedModeBanner: false,
       title: 'NavigationRail Demo',
       theme: _theme(ThemeData.light().copyWith(
-        accentColor: Colors.red,
+        colorScheme: ColorScheme.fromSwatch().copyWith(secondary: Colors.red),
       )),
       darkTheme: ThemeData.dark(),
       home: Directionality(
@@ -26,7 +26,7 @@ class MyApp extends StatelessWidget {
       appBarTheme: base.appBarTheme.copyWith(elevation: 0.0),
       floatingActionButtonTheme: base.floatingActionButtonTheme.copyWith(
         elevation: 2.0,
-        backgroundColor: base.accentColor,
+        backgroundColor: base.colorScheme.secondary,
       ),
     );
   }
@@ -96,19 +96,19 @@ class _MyHomePageState extends State<MyHomePage> {
       ),
       tabs: <BottomNavigationBarItem>[
         BottomNavigationBarItem(
-          title: Text("Folders"),
+          label: Text("Folders"),
           icon: Icon(Icons.folder),
         ),
         BottomNavigationBarItem(
-          title: Text("History"),
+          label: Text("History"),
           icon: Icon(Icons.history),
         ),
         BottomNavigationBarItem(
-          title: Text("Gallery"),
+          label: Text("Gallery"),
           icon: Icon(Icons.photo_library),
         ),
         BottomNavigationBarItem(
-          title: Text("Camera"),
+          label: Text("Camera"),
           icon: Icon(Icons.camera),
         ),
       ],

deprecated/navigation_rail/lib/navigation_rail.dart

@@ -144,10 +144,10 @@ class NavRail extends StatelessWidget {
       backgroundColor: Theme.of(context).scaffoldBackgroundColor,
       minWidth: isDense ? _denseRailSize : _railSize,
       selectedIconTheme: IconThemeData(
-        color: Theme.of(context).accentColor,
+        color: Theme.of(context).colorScheme.secondary,
       ),
       selectedLabelTextStyle: TextStyle(
-        color: Theme.of(context).accentColor,
+        color: Theme.of(context).colorScheme.secondary,
       ),
       unselectedIconTheme: IconThemeData(
         color: Colors.grey,
@@ -157,7 +157,7 @@ class NavRail extends StatelessWidget {
       onDestinationSelected: (val) => onTap(val),
       destinations: tabs
           .map((e) => NavigationRailDestination(
-                label: e.title,
+                label: e.label,
                 icon: e.icon,
               ))
           .toList(),
@@ -169,15 +169,15 @@ class NavRail extends StatelessWidget {
       child: SafeArea(
         child: Column(
           children: <Widget>[
-            if (drawerHeaderBuilder != null) ...[
-              drawerHeaderBuilder(context),
-            ],
+            ...[
+            drawerHeaderBuilder(context),
+          ],
             if (showTabs) ...[
               Expanded(child: buildRail(context, true)),
             ],
-            if (drawerFooterBuilder != null) ...[
-              drawerFooterBuilder(context),
-            ],
+            ...[
+            drawerFooterBuilder(context),
+          ],
           ],
         ),
       ),

deprecated/project_gen/lib/src/constants.dart

@@ -114,15 +114,13 @@ class MyApp extends StatelessWidget {
 """;
 
 String buildCustomColors(List<CustomColor> colors) {
-  if (colors != null) {
-    final sb = StringBuffer();
-    for (var color in colors) {
-      String _name = ReCase(color.name).camelCase;
-      int _value = color.color;
-      sb.writeln('  static Color get $_name => const Color($_value);');
-    }
-    return sb.toString();
+  final sb = StringBuffer();
+  for (var color in colors) {
+    String _name = ReCase(color.name).camelCase;
+    int _value = color.color;
+    sb.writeln('  static Color get $_name => const Color($_value);');
   }
+  return sb.toString();
   return '';
 }
 
@@ -134,52 +132,42 @@ import 'package:flutter/material.dart';
 
 bool isDark(BuildContext context) => Theme.of(context).brightness == Brightness.dark;
 
-ThemeMode get themeMode => ${(project?.themeMode ?? ThemeMode.system).toString()};
+ThemeMode get themeMode => ${(project.themeMode ?? ThemeMode.system).toString()};
 
   """);
 
-  sb.writeln(_writeProjectTheme(project?.lightTheme, 'LightTheme', true));
-  sb.writeln(_writeProjectTheme(project?.darkTheme, 'DarkTheme', false));
+  sb.writeln(_writeProjectTheme(project.lightTheme, 'LightTheme', true));
+  sb.writeln(_writeProjectTheme(project.darkTheme, 'DarkTheme', false));
   return sb.toString();
 }
 
 String _writeProjectTheme(ProjectTheme theme, String name, bool isLight) {
-  if (theme == null) {
-    return """
-class $name {
-  $name._();
-
-  static ThemeData get data => ThemeData.${isLight ? 'light' : 'dark'}();
-  
-} 
-  """;
-  }
   ThemeData _base = isLight ? ThemeData.light() : ThemeData.dark();
   return """
 class $name {
   $name._();
 
   static ThemeData get data => ThemeData(
-        brightness: ${theme?.lightBrightness ?? isLight ? 'Brightness.light' : 'Brightness.dark'},
+        brightness: ${theme.lightBrightness ?? isLight ? 'Brightness.light' : 'Brightness.dark'},
         visualDensity: VisualDensity.adaptivePlatformDensity,
         textTheme: ThemeData.${isLight ? 'light' : 'dark'}().textTheme
       ).copyWith(
-     primaryColor: const Color(${_getColor(theme?.primaryColor, _base.primaryColor)}),
-      accentColor: const Color(${_getColor(theme?.accentColor, _base.accentColor)}),
+     primaryColor: const Color(${_getColor(theme.primaryColor, _base.primaryColor)}),
+      accentColor: const Color(${_getColor(theme.accentColor, _base.colorScheme.secondary)}),
     floatingActionButtonTheme:
         ThemeData.${isLight ? 'light' : 'dark'}().floatingActionButtonTheme.copyWith(
-                backgroundColor: const Color(${_getColor(theme?.floatingActionButtonBackgroundColor, _base.floatingActionButtonTheme.backgroundColor)}),
-                 foregroundColor: const Color(${_getColor(theme?.floatingActionButtonForegroundColor, _base.floatingActionButtonTheme.foregroundColor)}),
+                backgroundColor: const Color(${_getColor(theme.floatingActionButtonBackgroundColor, _base.floatingActionButtonTheme.backgroundColor)}),
+                 foregroundColor: const Color(${_getColor(theme.floatingActionButtonForegroundColor, _base.floatingActionButtonTheme.foregroundColor)}),
             ),
-    scaffoldBackgroundColor: const Color(${_getColor(theme?.scaffoldBackgroundColor, _base.scaffoldBackgroundColor)}),
+    scaffoldBackgroundColor: const Color(${_getColor(theme.scaffoldBackgroundColor, _base.scaffoldBackgroundColor)}),
     appBarTheme: ThemeData.${isLight ? 'light' : 'dark'}().appBarTheme,
   );
 
-${buildCustomColors(theme?.customColors)}
+${buildCustomColors(theme.customColors)}
 }
   """;
 }
 
 int _getColor(int value, Color fallback) {
-  return value ?? fallback?.value ?? Colors.blue.value;
+  return value ?? fallback.value ?? Colors.blue.value;
 }

deprecated/project_gen/lib/src/files/mobile.dart

@@ -101,10 +101,8 @@ Future _writeFilesDir(
       if (!_dir.existsSync()) {
         _dir.createSync(recursive: true);
       }
-      if (file?.children != null) {
-        await _writeFilesDir(file.children, path, base);
-      }
-    }
+      await _writeFilesDir(file.children, path, base);
+        }
   }
 }
 

deprecated/project_gen/lib/src/project/project.freezed.dart

@@ -166,9 +166,6 @@ class _$FlutterProjectCopyWithImpl<$Res>
 
   @override
   $ProjectThemeCopyWith<$Res> get lightTheme {
-    if (_value.lightTheme == null) {
-      return null;
-    }
     return $ProjectThemeCopyWith<$Res>(_value.lightTheme, (value) {
       return _then(_value.copyWith(lightTheme: value));
     });
@@ -176,9 +173,6 @@ class _$FlutterProjectCopyWithImpl<$Res>
 
   @override
   $ProjectThemeCopyWith<$Res> get darkTheme {
-    if (_value.darkTheme == null) {
-      return null;
-    }
     return $ProjectThemeCopyWith<$Res>(_value.darkTheme, (value) {
       return _then(_value.copyWith(darkTheme: value));
     });
@@ -298,16 +292,7 @@ class _$_FlutterProject
       this.themeMode,
       this.canvasZoom = 0,
       this.canvasOffsetDx = 0,
-      this.canvasOffsetDy = 0})
-      : assert(name != null),
-        assert(org != null),
-        assert(description != null),
-        assert(useSwift != null),
-        assert(useKotlin != null),
-        assert(targets != null),
-        assert(canvasZoom != null),
-        assert(canvasOffsetDx != null),
-        assert(canvasOffsetDy != null);
+      this.canvasOffsetDy = 0});
 
   factory _$_FlutterProject.fromJson(Map<String, dynamic> json) =>
       _$_$_FlutterProjectFromJson(json);

deprecated/project_gen/lib/src/project/theme.freezed.dart

@@ -750,9 +750,6 @@ class _$_CustomGradient
         double endY,
         TileMode tileMode),
   }) {
-    assert($default != null);
-    assert(radial != null);
-    assert(linear != null);
     return $default(name, colors);
   }
 
@@ -781,11 +778,8 @@ class _$_CustomGradient
         TileMode tileMode),
     @required Result orElse(),
   }) {
-    assert(orElse != null);
-    if ($default != null) {
-      return $default(name, colors);
-    }
-    return orElse();
+    return $default(name, colors);
+      return orElse();
   }
 
   @override
@@ -795,9 +789,6 @@ class _$_CustomGradient
     @required Result radial(CustomRadialGradient value),
     @required Result linear(CustomLinearGradient value),
   }) {
-    assert($default != null);
-    assert(radial != null);
-    assert(linear != null);
     return $default(this);
   }
 
@@ -809,11 +800,8 @@ class _$_CustomGradient
     Result linear(CustomLinearGradient value),
     @required Result orElse(),
   }) {
-    assert(orElse != null);
-    if ($default != null) {
-      return $default(this);
-    }
-    return orElse();
+    return $default(this);
+      return orElse();
   }
 
   @override
@@ -1006,9 +994,6 @@ class _$CustomRadialGradient
         double endY,
         TileMode tileMode),
   }) {
-    assert($default != null);
-    assert(radial != null);
-    assert(linear != null);
     return radial(name, stops, colors, radius, alignX, alignY, focalX, focalY);
   }
 
@@ -1037,12 +1022,9 @@ class _$CustomRadialGradient
         TileMode tileMode),
     @required Result orElse(),
   }) {
-    assert(orElse != null);
-    if (radial != null) {
-      return radial(
-          name, stops, colors, radius, alignX, alignY, focalX, focalY);
-    }
-    return orElse();
+    return radial(
+        name, stops, colors, radius, alignX, alignY, focalX, focalY);
+      return orElse();
   }
 
   @override
@@ -1052,9 +1034,6 @@ class _$CustomRadialGradient
     @required Result radial(CustomRadialGradient value),
     @required Result linear(CustomLinearGradient value),
   }) {
-    assert($default != null);
-    assert(radial != null);
-    assert(linear != null);
     return radial(this);
   }
 
@@ -1066,11 +1045,8 @@ class _$CustomRadialGradient
     Result linear(CustomLinearGradient value),
     @required Result orElse(),
   }) {
-    assert(orElse != null);
-    if (radial != null) {
-      return radial(this);
-    }
-    return orElse();
+    return radial(this);
+      return orElse();
   }
 
   @override
@@ -1288,9 +1264,6 @@ class _$CustomLinearGradient
         double endY,
         TileMode tileMode),
   }) {
-    assert($default != null);
-    assert(radial != null);
-    assert(linear != null);
     return linear(
         name, stops, colors, radius, startX, startY, endX, endY, tileMode);
   }
@@ -1320,12 +1293,9 @@ class _$CustomLinearGradient
         TileMode tileMode),
     @required Result orElse(),
   }) {
-    assert(orElse != null);
-    if (linear != null) {
-      return linear(
-          name, stops, colors, radius, startX, startY, endX, endY, tileMode);
-    }
-    return orElse();
+    return linear(
+        name, stops, colors, radius, startX, startY, endX, endY, tileMode);
+      return orElse();
   }
 
   @override
@@ -1335,9 +1305,6 @@ class _$CustomLinearGradient
     @required Result radial(CustomRadialGradient value),
     @required Result linear(CustomLinearGradient value),
   }) {
-    assert($default != null);
-    assert(radial != null);
-    assert(linear != null);
     return linear(this);
   }
 
@@ -1349,11 +1316,8 @@ class _$CustomLinearGradient
     Result linear(CustomLinearGradient value),
     @required Result orElse(),
   }) {
-    assert(orElse != null);
-    if (linear != null) {
-      return linear(this);
-    }
-    return orElse();
+    return linear(this);
+      return orElse();
   }
 
   @override

deprecated/project_gen/lib/src/project/widget.freezed.dart

@@ -196,10 +196,7 @@ class _$ProjectScreen with DiagnosticableTreeMixin implements ProjectScreen {
       this.dx,
       this.dy,
       this.width,
-      this.height})
-      : assert(className != null),
-        assert(isStateful != null),
-        assert(route != null);
+      this.height});
 
   factory _$ProjectScreen.fromJson(Map<String, dynamic> json) =>
       _$_$ProjectScreenFromJson(json);

deprecated/project_gen/lib/src/project_files.dart

@@ -106,12 +106,8 @@ class ProjectFile extends ProjectFileBase {
 
   Future<FileData> getFileData() async {
     List<int> _data;
-    if (content.value != null) {
-      _data = content.value;
-    } else if (readAsBytes != null) {
-      _data = await readAsBytes;
-    }
-    return FileData(
+    _data = content.value;
+      return FileData(
       _data,
       _data.length,
       filename,

deprecated/responsive_scaffold/example/lib/examples/layout.dart

@@ -74,7 +74,7 @@ class LayoutExample extends StatelessWidget {
       ),
       floatingActionButton: FloatingActionButton(
         child: Icon(Icons.add),
-        backgroundColor: Theme.of(context).accentColor,
+        backgroundColor: Theme.of(context).colorScheme.secondary,
         onPressed: () {},
       ),
     );

deprecated/responsive_scaffold/example/lib/examples/list.dart

@@ -53,7 +53,7 @@ class _ListExampleState extends State<ListExample> {
           title: Text("App Bar"),
         ),
       ],
-      itemCount: _items?.length ?? 0,
+      itemCount: _items.length ?? 0,
       itemBuilder: (BuildContext context, int index) {
         final i = _items[index];
         return ListTile(

deprecated/responsive_scaffold/example/lib/main.dart

@@ -22,16 +22,14 @@ void _setTargetPlatformForDesktop() {
   } else if (Platform.isLinux || Platform.isWindows) {
     targetPlatform = TargetPlatform.android;
   }
-  if (targetPlatform != null) {
-    debugDefaultTargetPlatformOverride = targetPlatform;
-  }
+  debugDefaultTargetPlatformOverride = targetPlatform;
 }
 
 class MyApp extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     return MaterialApp(
-      theme: ThemeData.light().copyWith(accentColor: Colors.red),
+      theme: ThemeData.light().copyWith(colorScheme: ColorScheme.fromSwatch().copyWith(secondary: Colors.red)),
       debugShowCheckedModeBanner: false,
       home: HomePage(),
     );

deprecated/responsive_scaffold/lib/templates/3-column/common/details.dart

@@ -51,16 +51,15 @@ class DetailsView extends StatelessWidget {
                       ),
                     ],
                   ),
-                  if (_details?.title != null)
-                    Expanded(
-                      child: Center(child: _details.title),
-                    ),
+                  Expanded(
+                    child: Center(child: _details.title),
+                  ),
                 ],
               ),
-        actions: _details?.actions,
+        actions: _details.actions,
       ),
       body: _details.child,
-      bottomNavigationBar: _details?.bottomAppBar,
+      bottomNavigationBar: _details.bottomAppBar,
     );
   }
 }

deprecated/responsive_scaffold/lib/templates/3-column/three_column_navigation.dart

@@ -85,9 +85,9 @@ class _ThreeColumnNavigationState extends State<ThreeColumnNavigation> {
                   Container(
                     width: 300,
                     child: Scaffold(
-                      backgroundColor: widget?.backgroundColor,
+                      backgroundColor: widget.backgroundColor,
                       appBar: AppBar(
-                        title: widget?.title,
+                        title: widget.title,
                         leading: IconButton(
                           icon: Icon(widget.expandedIconData),
                           onPressed: () {
@@ -111,7 +111,7 @@ class _ThreeColumnNavigationState extends State<ThreeColumnNavigation> {
                           }
                         },
                       ),
-                      bottomNavigationBar: widget?.bottomAppBar,
+                      bottomNavigationBar: widget.bottomAppBar,
                     ),
                   ),
                 Container(
@@ -164,7 +164,7 @@ class _ThreeColumnNavigationState extends State<ThreeColumnNavigation> {
                       },
                     ),
                     bottomNavigationBar:
-                        widget.sections[_sectionIndex]?.bottomAppBar,
+                        widget.sections[_sectionIndex].bottomAppBar,
                   ),
                 ),
                 Expanded(
@@ -221,7 +221,7 @@ class _ThreeColumnNavigationState extends State<ThreeColumnNavigation> {
             },
           ),
           appBar: AppBar(
-            title: widget.sections[_sectionIndex]?.label,
+            title: widget.sections[_sectionIndex].label,
           ),
           body: SectionList(
             controller: controller,
@@ -250,7 +250,7 @@ class _ThreeColumnNavigationState extends State<ThreeColumnNavigation> {
               }
             },
           ),
-          bottomNavigationBar: widget.sections[_sectionIndex]?.bottomAppBar,
+          bottomNavigationBar: widget.sections[_sectionIndex].bottomAppBar,
         );
       },
     );

deprecated/responsive_scaffold/lib/templates/layout/scaffold.dart

@@ -46,16 +46,16 @@ class ResponsiveScaffold extends StatelessWidget {
               children: <Widget>[
                 Row(
                   children: <Widget>[
-                    if (drawer != null) ...[
-                      SizedBox(
-                        width: _drawerWidth,
-                        child: Drawer(
-                          child: SafeArea(
-                            child: drawer,
-                          ),
+                    ...[
+                    SizedBox(
+                      width: _drawerWidth,
+                      child: Drawer(
+                        child: SafeArea(
+                          child: drawer,
                         ),
                       ),
-                    ],
+                    ),
+                  ],
                     Expanded(
                       child: Scaffold(
                         key: scaffoldKey,
@@ -64,9 +64,9 @@ class ResponsiveScaffold extends StatelessWidget {
                           automaticallyImplyLeading: false,
                           title: title,
                           actions: <Widget>[
-                            if (trailing != null) ...[
-                              trailing,
-                            ],
+                            ...[
+                            trailing,
+                          ],
                           ],
                         ),
                         body: Row(
@@ -74,30 +74,30 @@ class ResponsiveScaffold extends StatelessWidget {
                             Expanded(
                               child: body ?? Container(),
                             ),
-                            if (endDrawer != null) ...[
-                              Container(
-                                width: _drawerWidth,
-                                child: Drawer(
-                                  elevation: 3.0,
-                                  child: SafeArea(
-                                    child: endDrawer,
-                                  ),
+                            ...[
+                            Container(
+                              width: _drawerWidth,
+                              child: Drawer(
+                                elevation: 3.0,
+                                child: SafeArea(
+                                  child: endDrawer,
                                 ),
                               ),
-                            ],
+                            ),
+                          ],
                           ],
                         ),
                       ),
                     ),
                   ],
                 ),
-                if (floatingActionButton != null) ...[
-                  Positioned(
-                    top: 100.0,
-                    left: _drawerWidth - 30,
-                    child: floatingActionButton,
-                  )
-                ],
+                ...[
+                Positioned(
+                  top: 100.0,
+                  left: _drawerWidth - 30,
+                  child: floatingActionButton,
+                )
+              ],
               ],
             ),
           );
@@ -105,9 +105,7 @@ class ResponsiveScaffold extends StatelessWidget {
         if (constraints.maxWidth >= kTabletBreakpoint) {
           return Scaffold(
             key: scaffoldKey,
-            drawer: drawer == null
-                ? null
-                : Drawer(
+            drawer: Drawer(
                     child: SafeArea(
                       child: drawer,
                     ),
@@ -118,9 +116,9 @@ class ResponsiveScaffold extends StatelessWidget {
               title: title,
               leading: _MenuButton(iconData: menuIcon),
               actions: <Widget>[
-                if (trailing != null) ...[
-                  trailing,
-                ],
+                ...[
+                trailing,
+              ],
               ],
             ),
             body: SafeArea(
@@ -133,26 +131,26 @@ class ResponsiveScaffold extends StatelessWidget {
                       Expanded(
                         child: body ?? Container(),
                       ),
-                      if (endDrawer != null) ...[
-                        Container(
-                          width: _drawerWidth,
-                          child: Drawer(
-                            elevation: 3.0,
-                            child: SafeArea(
-                              child: endDrawer,
-                            ),
+                      ...[
+                      Container(
+                        width: _drawerWidth,
+                        child: Drawer(
+                          elevation: 3.0,
+                          child: SafeArea(
+                            child: endDrawer,
                           ),
                         ),
-                      ],
+                      ),
+                    ],
                     ],
                   ),
-                  if (floatingActionButton != null) ...[
-                    Positioned(
-                      top: 10.0,
-                      left: 10.0,
-                      child: floatingActionButton,
-                    )
-                  ],
+                  ...[
+                  Positioned(
+                    top: 10.0,
+                    left: 10.0,
+                    child: floatingActionButton,
+                  )
+                ],
                 ],
               ),
             ),
@@ -160,16 +158,12 @@ class ResponsiveScaffold extends StatelessWidget {
         }
         return Scaffold(
           key: scaffoldKey,
-          drawer: drawer == null
-              ? null
-              : Drawer(
+          drawer: Drawer(
                   child: SafeArea(
                     child: drawer,
                   ),
                 ),
-          endDrawer: endDrawer == null
-              ? null
-              : Drawer(
+          endDrawer: Drawer(
                   child: SafeArea(
                     child: endDrawer,
                   ),
@@ -180,12 +174,12 @@ class ResponsiveScaffold extends StatelessWidget {
             leading: _MenuButton(iconData: menuIcon),
             title: title,
             actions: <Widget>[
-              if (trailing != null) ...[
-                trailing,
-              ],
-              if (endDrawer != null) ...[
-                _OptionsButton(iconData: endIcon),
-              ]
+              ...[
+              trailing,
+            ],
+              ...[
+              _OptionsButton(iconData: endIcon),
+            ]
             ],
           ),
           body: body,

deprecated/responsive_scaffold/lib/templates/list/responsive_list.dart

@@ -214,7 +214,7 @@ class ResponsiveListScaffold extends StatelessWidget {
           persistentFooterButtons: persistentFooterButtons,
           floatingActionButtonAnimator: floatingActionButtonAnimator,
           resizeToAvoidBottomInset: resizeToAvoidBottomInset,
-          resizeToAvoidBottomPadding: resizeToAvoidBottomPadding,
+          resizeToAvoidBottomInset: resizeToAvoidBottomPadding,
           primary: primary,
           // extendBody: extendBody,
           backgroundColor: backgroundColor,

deprecated/responsive_scaffold/lib/templates/list/views/mobile.dart

@@ -69,11 +69,10 @@ class MobileView extends StatelessWidget {
         ..addAll(slivers ?? [])
         ..add(Builder(
           builder: (BuildContext context) {
-            if (childDelagate?.estimatedChildCount == null && nullItems != null)
+            if (childDelagate.estimatedChildCount == null)
               return SliverFillRemaining(child: nullItems);
-            if (childDelagate?.estimatedChildCount != null &&
-                childDelagate.estimatedChildCount == 0 &&
-                emptyItems != null)
+            if (childDelagate.estimatedChildCount != null &&
+                childDelagate.estimatedChildCount == 0)
               return SliverFillRemaining(child: emptyItems);
             return SliverList(
                 delegate: SliverChildBuilderDelegate(
@@ -101,7 +100,7 @@ class MobileView extends StatelessWidget {
                   ),
                 );
               },
-              childCount: childDelagate?.estimatedChildCount ?? 0,
+              childCount: childDelagate.estimatedChildCount ?? 0,
               addAutomaticKeepAlives: false,
               addRepaintBoundaries: false,
               addSemanticIndexes: false,

deprecated/responsive_scaffold/lib/templates/list/views/tablet.dart

@@ -171,40 +171,38 @@ class _TabletViewState extends State<TabletView> {
       body: Flex(
         direction: Axis.horizontal,
         children: <Widget>[
-          widget?.sideMenu ?? Container(),
+          widget.sideMenu ?? Container(),
           Flexible(
             flex: widget.flexListView,
             child: Scaffold(
-              key: widget?.scaffoldkey,
-              floatingActionButton: widget?.floatingActionButton,
+              key: widget.scaffoldkey,
+              floatingActionButton: widget.floatingActionButton,
               floatingActionButtonLocation:
-                  widget?.floatingActionButtonLocation,
-              bottomNavigationBar: widget?.bottomNavigationBar,
-              bottomSheet: widget?.bottomSheet,
-              persistentFooterButtons: widget?.persistentFooterButtons,
+                  widget.floatingActionButtonLocation,
+              bottomNavigationBar: widget.bottomNavigationBar,
+              bottomSheet: widget.bottomSheet,
+              persistentFooterButtons: widget.persistentFooterButtons,
               floatingActionButtonAnimator:
-                  widget?.floatingActionButtonAnimator,
-              resizeToAvoidBottomInset: widget?.resizeToAvoidBottomInset,
-              resizeToAvoidBottomPadding: widget?.resizeToAvoidBottomPadding,
-              primary: widget?.primary,
+                  widget.floatingActionButtonAnimator,
+              resizeToAvoidBottomInset: widget.resizeToAvoidBottomInset,
+              resizeToAvoidBottomInset: widget.resizeToAvoidBottomPadding,
+              primary: widget.primary,
               // extendBody: extendBody,
-              backgroundColor: widget?.backgroundColor,
-              drawer: widget?.drawer,
-              endDrawer: widget?.endDrawer,
-              appBar: widget?.appBar,
+              backgroundColor: widget.backgroundColor,
+              drawer: widget.drawer,
+              endDrawer: widget.endDrawer,
+              appBar: widget.appBar,
               body: CustomScrollView(
                 slivers: <Widget>[]
                   ..addAll(widget.slivers ?? [])
                   ..add(Builder(
                     builder: (BuildContext context) {
                       SliverChildDelegate _childDelagate =
-                          widget?.childDelagate;
-                      if (_childDelagate?.estimatedChildCount == null &&
-                          widget?.nullItems != null)
+                          widget.childDelagate;
+                      if (_childDelagate.estimatedChildCount == null)
                         return SliverFillRemaining(child: widget.nullItems);
-                      if (_childDelagate?.estimatedChildCount != null &&
-                          _childDelagate.estimatedChildCount == 0 &&
-                          widget?.emptyItems != null)
+                      if (_childDelagate.estimatedChildCount != null &&
+                          _childDelagate.estimatedChildCount == 0)
                         return SliverFillRemaining(child: widget.emptyItems);
                       return SliverList(
                           delegate: SliverChildBuilderDelegate(
@@ -224,7 +222,7 @@ class _TabletViewState extends State<TabletView> {
                                       ? Theme.of(context)
                                           .chipTheme
                                           .disabledColor
-                                      : widget?.backgroundColor,
+                                      : widget.backgroundColor,
                                   padding:
                                       const EdgeInsets.symmetric(vertical: 8.0),
                                   child: _childDelagate.build(context, index),
@@ -233,7 +231,7 @@ class _TabletViewState extends State<TabletView> {
                             ),
                           );
                         },
-                        childCount: _childDelagate?.estimatedChildCount ?? 0,
+                        childCount: _childDelagate.estimatedChildCount ?? 0,
                         addAutomaticKeepAlives: false,
                         addRepaintBoundaries: false,
                         addSemanticIndexes: false,
@@ -246,12 +244,11 @@ class _TabletViewState extends State<TabletView> {
           Flexible(
             flex: widget.flexDetailView,
             child: new _DetailView(
-              detailScaffoldKey: widget?.detailScaffoldKey,
-              details: _index == null ||
-                      _index > widget.childDelagate.estimatedChildCount - 1
+              detailScaffoldKey: widget.detailScaffoldKey,
+              details: _index > widget.childDelagate.estimatedChildCount - 1
                   ? null
                   : widget.detailBuilder(context, _index, true),
-              itemNotSelected: widget?.itemNotSelected,
+              itemNotSelected: widget.itemNotSelected,
             ),
           ),
         ],

deprecated/scaffold_tab_bar/example/lib/main.dart

@@ -18,21 +18,21 @@ class MyApp extends StatelessWidget {
             screen: Screen1(),
             tab: BottomNavigationBarItem(
               icon: Icon(Icons.home),
-              title: Text('Home'),
+              label: Text('Home'),
             ),
           ),
           ScreenTab(
             screen: Screen2(),
             tab: BottomNavigationBarItem(
               icon: Icon(Icons.event),
-              title: Text('Calendar'),
+              label: Text('Calendar'),
             ),
           ),
           ScreenTab(
             screen: Screen3(),
             tab: BottomNavigationBarItem(
               icon: Icon(Icons.search),
-              title: Text('Search'),
+              label: Text('Search'),
             ),
           ),
         ],

deprecated/scaffold_tab_bar/lib/src/tab_bar.dart

@@ -61,7 +61,7 @@ class _ScaffoldTabBarState extends State<ScaffoldTabBar> {
     _screens = widget.children;
     _currentIndex = 0;
     for (var screen in _screens) {
-      _keys.add(GlobalKey<NavigatorState>(debugLabel: screen?.debugLabel));
+      _keys.add(GlobalKey<NavigatorState>(debugLabel: screen.debugLabel));
     }
   }
 
@@ -98,23 +98,23 @@ class _ScaffoldTabBarState extends State<ScaffoldTabBar> {
       ));
     }
     return Scaffold(
-      backgroundColor: widget?.backgroundColor,
-      key: widget?.scaffoldKey,
-      drawer: widget?.drawer,
-      endDrawer: widget?.endDrawer,
-      persistentFooterButtons: widget?.persistentFooterButtons,
-      floatingActionButton: widget?.floatingActionButton,
-      floatingActionButtonAnimator: widget?.floatingActionButtonAnimator,
-      floatingActionButtonLocation: widget?.floatingActionButtonLocation,
+      backgroundColor: widget.backgroundColor,
+      key: widget.scaffoldKey,
+      drawer: widget.drawer,
+      endDrawer: widget.endDrawer,
+      persistentFooterButtons: widget.persistentFooterButtons,
+      floatingActionButton: widget.floatingActionButton,
+      floatingActionButtonAnimator: widget.floatingActionButtonAnimator,
+      floatingActionButtonLocation: widget.floatingActionButtonLocation,
       body: IndexedStack(
         index: _currentIndex,
         children: _children,
       ),
       bottomNavigationBar: BottomNavigationBar(
-        type: widget?.bottomNavigationBarType,
+        type: widget.bottomNavigationBarType,
         currentIndex: _currentIndex,
         onTap: (val) => _onTap(val, context),
-        backgroundColor: widget?.bottomNavigationBarBackgroundColor ??
+        backgroundColor: widget.bottomNavigationBarBackgroundColor ??
             Theme.of(context).scaffoldBackgroundColor,
         items: _screens.map((s) => s.tab).toList(),
       ),

deprecated/settings_manager/example/lib/main.dart

@@ -52,7 +52,7 @@ class _MyHomePageState extends State<MyHomePage> {
                   ),
                   Text(
                     '${snapshot.data}',
-                    style: Theme.of(context).textTheme.headline4,
+                    style: Theme.of(context).textTheme.headlineMedium,
                   ),
                 ],
               ),