Adds model layer and list view to veggieseasons. (#13)

veggieseasons/lib/screens/list.dart

@@ -4,19 +4,65 @@
 
 import 'package:flutter/cupertino.dart';
 import 'package:flutter/widgets.dart';
+import 'package:intl/intl.dart';
+import 'package:scoped_model/scoped_model.dart';
+import 'package:veggieseasons/data/model.dart';
+import 'package:veggieseasons/data/veggie.dart';
 import 'package:veggieseasons/styles.dart';
+import 'package:veggieseasons/widgets/veggie_headline.dart';
 
 class ListScreen extends StatelessWidget {
+  List<Widget> _generateVeggieRows(List<Veggie> veggies) {
+    final cards = new List<Widget>();
+
+    for (Veggie veggie in veggies) {
+      cards.add(Padding(
+        padding: EdgeInsets.only(left: 16.0, right: 16.0, bottom: 24.0),
+        child: VeggieHeadline(veggie),
+      ));
+    }
+
+    return cards;
+  }
+
   @override
   Widget build(BuildContext context) {
-    return CupertinoPageScaffold(
-      navigationBar: CupertinoNavigationBar(
-        middle: Text('List'),
+    String dateString = DateFormat.yMMMMd("en_US").format(DateTime.now());
+    final model = ScopedModel.of<AppState>(context, rebuildOnChange: true);
+
+    final rows = <Widget>[];
+
+    rows.add(
+      Padding(
+        padding: const EdgeInsets.fromLTRB(16.0, 24.0, 16.0, 16.0),
+        child: Column(
+          crossAxisAlignment: CrossAxisAlignment.start,
+          children: [
+            Text(dateString.toUpperCase(), style: Styles.minorText),
+            Text('In season today', style: Styles.headlineText),
+          ],
+        ),
       ),
-      backgroundColor: Styles.scaffoldBackground,
-      child: Center(
-        child: Text('Not yet implemented.'),
+    );
+
+    rows.addAll(_generateVeggieRows(model.availableVeggies));
+
+    rows.add(
+      Padding(
+        padding: const EdgeInsets.fromLTRB(16.0, 24.0, 16.0, 16.0),
+        child: Text('Not in season', style: Styles.headlineText),
       ),
     );
+
+    rows.addAll(_generateVeggieRows(model.unavailableVeggies));
+
+    return CupertinoTabView(
+      builder: (context) => DecoratedBox(
+            decoration: BoxDecoration(color: Color(0xffffffff)),
+            child: ListView(
+              children: rows,
+            ),
+          ),
+    );
   }
 }