Null Safety fixes #31

README.md

@@ -42,12 +42,14 @@ import 'package:flutter/material.dart';
 import 'package:responsive_scaffold/responsive_scaffold.dart';
 
 class LayoutExample extends StatelessWidget {
+  const LayoutExample({Key? key}) : super(key: key);
+
   @override
   Widget build(BuildContext context) {
     return ResponsiveScaffold(
-      title: Text('Responsive Layout Example'),
+      title: const Text('Responsive Layout Example'),
       drawer: ListView(
-        children: <Widget>[
+        children: const <Widget>[
           ListTile(
             leading: Icon(Icons.settings),
             title: Text('Settings Page'),
@@ -70,15 +72,15 @@ class LayoutExample extends StatelessWidget {
       endDrawer: ListView(
         children: <Widget>[
           ListTile(
-            leading: Icon(Icons.filter_list),
-            title: Text('Filter List'),
-            subtitle: Text('Hide and show items'),
+            leading: const Icon(Icons.filter_list),
+            title: const Text('Filter List'),
+            subtitle: const Text('Hide and show items'),
             trailing: Switch(
               value: true,
               onChanged: (val) {},
             ),
           ),
-          ListTile(
+          const ListTile(
             leading: Icon(Icons.image_aspect_ratio),
             title: Text('Size Settings'),
             subtitle: Text('Change size of images'),
@@ -90,9 +92,9 @@ class LayoutExample extends StatelessWidget {
             ),
           ),
           ListTile(
-            leading: Icon(Icons.sort_by_alpha),
-            title: Text('Sort List'),
-            subtitle: Text('Change layout behavior'),
+            leading: const Icon(Icons.sort_by_alpha),
+            title: const Text('Sort List'),
+            subtitle: const Text('Change layout behavior'),
             trailing: Switch(
               value: false,
               onChanged: (val) {},
@@ -101,27 +103,26 @@ class LayoutExample extends StatelessWidget {
         ],
       ),
       trailing: IconButton(
-        icon: Icon(Icons.search),
+        icon: const Icon(Icons.search),
         onPressed: () {},
       ),
       body: Center(
-        child: RaisedButton(
-          child: Text('Close'),
+        child: ElevatedButton(
           onPressed: () {
             Navigator.pop(context);
           },
+          child: const Text('Close'),
         ),
       ),
       floatingActionButton: FloatingActionButton(
-        child: Icon(Icons.add),
         backgroundColor: Theme.of(context).accentColor,
         onPressed: () {},
+        child: const Icon(Icons.add),
       ),
     );
   }
 }
 
-
 ```
 
 ### Responsive List
@@ -141,107 +142,132 @@ class LayoutExample extends StatelessWidget {
 
 ``` dart 
 import 'package:flutter/material.dart';
-
 import 'package:responsive_scaffold/responsive_scaffold.dart';
 
-void main() => runApp(MyApp());
+class ListExample extends StatefulWidget {
+  const ListExample({Key? key}) : super(key: key);
 
-class MyApp extends StatefulWidget {
   @override
-  _MyAppState createState() => _MyAppState();
+  _ListExampleState createState() => _ListExampleState();
 }
 
-class _MyAppState extends State<MyApp> {
-  var _scaffoldKey = new GlobalKey<ScaffoldState>();
+class _ListExampleState extends State<ListExample> {
+  final _scaffoldKey = GlobalKey<ScaffoldState>();
+
+  late List<String> _items;
+
+  @override
+  void initState() {
+    _items = List.generate(20, (int index) => "test_$index");
+    super.initState();
+  }
 
   @override
   Widget build(BuildContext context) {
-    return MaterialApp(
-      home: ResponsiveListScaffold.builder(
-        scaffoldKey: _scaffoldKey,
-        detailBuilder: (BuildContext context, int index, bool tablet) {
-          return DetailsScreen(
-            // appBar: AppBar(
-            //   elevation: 0.0,
-            //   title: Text("Details"),
-            //   actions: [
-            //     IconButton(
-            //       icon: Icon(Icons.share),
-            //       onPressed: () {},
-            //     ),
-            //     IconButton(
-            //       icon: Icon(Icons.delete),
-            //       onPressed: () {
-            //         if (!tablet) Navigator.of(context).pop();
-            //       },
-            //     ),
-            //   ],
-            // ),
-            body: Scaffold(
-              appBar: AppBar(
-                elevation: 0.0,
-                title: Text("Details"),
-                automaticallyImplyLeading: !tablet,
-                actions: [
-                  IconButton(
-                    icon: Icon(Icons.share),
-                    onPressed: () {},
-                  ),
-                  IconButton(
-                    icon: Icon(Icons.delete),
-                    onPressed: () {
-                      if (!tablet) Navigator.of(context).pop();
-                    },
-                  ),
-                ],
-              ),
-              bottomNavigationBar: BottomAppBar(
-                elevation: 0.0,
-                child: Container(
-                  child: IconButton(
-                    icon: Icon(Icons.share),
-                    onPressed: () {},
-                  ),
-                ),
-              ),
-              body: Container(
-                child: Center(
-                  child: Text("Item: $index"),
-                ),
-              ),
+    return ResponsiveListScaffold.builder(
+      scaffoldKey: _scaffoldKey,
+      detailBuilder: (BuildContext context, int index, bool tablet) {
+        final i = _items[index];
+        return DetailsScreen(
+          body: ExampleDetailsScreen(
+            items: _items,
+            row: i,
+            tablet: tablet,
+            onDelete: () {
+              setState(() {
+                _items.removeAt(index);
+              });
+              if (!tablet) Navigator.of(context).pop();
+            },
+            onChanged: (String value) {
+              setState(() {
+                _items[index] = value;
+              });
+            },
+          ),
+        );
+      },
+      nullItems: const Center(child: CircularProgressIndicator()),
+      emptyItems: const Center(child: Text("No Items Found")),
+      slivers: const <Widget>[
+        SliverAppBar(
+          title: Text("App Bar"),
+        ),
+      ],
+      itemCount: _items.length,
+      itemBuilder: (BuildContext context, int index) {
+        final i = _items[index];
+        return ListTile(
+          leading: Text(i),
+        );
+      },
+      bottomNavigationBar: BottomAppBar(
+        elevation: 0.0,
+        child: IconButton(
+          icon: const Icon(Icons.share),
+          onPressed: () {},
+        ),
+      ),
+      floatingActionButton: FloatingActionButton(
+        onPressed: () {
+          ScaffoldMessenger.of(context).showSnackBar(
+            const SnackBar(
+              content: Text("Snackbar!"),
             ),
           );
         },
-        nullItems: Center(child: CircularProgressIndicator()),
-        emptyItems: Center(child: Text("No Items Found")),
-        slivers: <Widget>[
-          SliverAppBar(
-            title: Text("App Bar"),
+        child: const Icon(Icons.add),
+      ),
+    );
+  }
+}
+
+class ExampleDetailsScreen extends StatelessWidget {
+  const ExampleDetailsScreen({
+    Key? key,
+    required List<String> items,
+    required this.row,
+    required this.tablet,
+    required this.onDelete,
+    required this.onChanged,
+  })   : _items = items,
+        super(key: key);
+
+  final List<String> _items;
+  final String row;
+  final bool tablet;
+  final VoidCallback onDelete;
+  final ValueChanged<String> onChanged;
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(
+        elevation: 0.0,
+        automaticallyImplyLeading: !tablet,
+        title: const Text("Details"),
+        actions: [
+          IconButton(
+            icon: const Icon(Icons.share),
+            onPressed: () {
+              onChanged("$row ${DateTime.now().toString()}");
+            },
           ),
-        ],
-        itemCount: 100,
-        itemBuilder: (BuildContext context, int index) {
-          return ListTile(
-            leading: Text(index.toString()),
-          );
-        },
-        bottomNavigationBar: BottomAppBar(
-          elevation: 0.0,
-          child: Container(
-            child: IconButton(
-              icon: Icon(Icons.share),
-              onPressed: () {},
-            ),
+          IconButton(
+            icon: const Icon(Icons.delete),
+            onPressed: onDelete,
           ),
+        ],
+      ),
+      bottomNavigationBar: BottomAppBar(
+        elevation: 0.0,
+        child: IconButton(
+          icon: const Icon(Icons.share),
+          onPressed: () {},
         ),
-        floatingActionButton: FloatingActionButton(
-          child: Icon(Icons.add),
-          onPressed: () {
-            _scaffoldKey.currentState.showSnackBar(SnackBar(
-              content: Text("Snackbar!"),
-            ));
-          },
-        ),
+      ),
+      body: Center(
+        child: Text("Item: $row"),
       ),
     );
   }

analysis_options.yaml

@@ -0,0 +1 @@
+include: package:lint/analysis_options_package.yaml