Adding no-result display to search screen. (#57)

veggieseasons/lib/screens/search.dart

@@ -17,47 +17,58 @@ class SearchScreen extends StatefulWidget {
 }
 
 class _SearchScreenState extends State<SearchScreen> {
-  final _controller = TextEditingController();
-  final _focusNode = FocusNode();
-  String _terms = '';
+  final controller = TextEditingController();
+  final focusNode = FocusNode();
+  String terms = '';
 
   @override
   void initState() {
     super.initState();
-    _controller.addListener(_onTextChanged);
+    controller.addListener(_onTextChanged);
   }
 
   @override
   void dispose() {
-    _focusNode.dispose();
+    focusNode.dispose();
     super.dispose();
   }
 
   void _onTextChanged() {
-    setState(() => _terms = _controller.text);
+    setState(() => terms = controller.text);
   }
 
   Widget _createSearchBox() {
     return Padding(
       padding: const EdgeInsets.all(8.0),
       child: SearchBar(
-        controller: _controller,
-        focusNode: _focusNode,
+        controller: controller,
+        focusNode: focusNode,
       ),
     );
   }
 
-  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),
-      ));
+  Widget _buildSearchResults(List<Veggie> veggies) {
+    if (veggies.isEmpty) {
+      return Center(
+        child: Padding(
+          padding: const EdgeInsets.symmetric(horizontal: 24.0),
+          child: Text(
+            'No veggies matching your search terms were found.',
+            style: Styles.headlineDescription,
+          ),
+        ),
+      );
     }
 
-    return cards;
+    return ListView.builder(
+      itemCount: veggies.length,
+      itemBuilder: (context, i) {
+        return Padding(
+          padding: EdgeInsets.only(left: 16.0, right: 16.0, bottom: 24.0),
+          child: VeggieHeadline(veggies[i]),
+        );
+      },
+    );
   }
 
   @override
@@ -75,9 +86,7 @@ class _SearchScreenState extends State<SearchScreen> {
               children: [
                 _createSearchBox(),
                 Expanded(
-                  child: ListView(
-                    children: _generateVeggieRows(model.searchVeggies(_terms)),
-                  ),
+                  child: _buildSearchResults(model.searchVeggies(terms)),
                 ),
               ],
             ),

veggieseasons/lib/widgets/search_bar.dart

@@ -29,9 +29,11 @@ class SearchBar extends StatelessWidget {
         ),
         child: Row(
           children: [
-            Icon(
-              CupertinoIcons.search,
-              color: Styles.searchIconColor,
+            ExcludeSemantics(
+              child: Icon(
+                CupertinoIcons.search,
+                color: Styles.searchIconColor,
+              ),
             ),
             Expanded(
               child: CupertinoTextField(
@@ -47,6 +49,7 @@ class SearchBar extends StatelessWidget {
               },
               child: Icon(
                 CupertinoIcons.clear_thick_circled,
+                semanticLabel: 'Clear search terms',
                 color: Styles.searchIconColor,
               ),
             ),