Make Stocks app search actually search

sky/framework/components/input.dart

Index: sky/framework/components/input.dart
diff --git a/sky/framework/components/input.dart b/sky/framework/components/input.dart
index 5c5cc3ce521572856c6a27410060909b750b770a..f264b4a4d88589bfbbfc464c1dc1551f7b0e0c19 100644
--- a/sky/framework/components/input.dart
+++ b/sky/framework/components/input.dart
@@ -35,25 +35,28 @@ class Input extends Component {
     border-bottom: 2px solid ${Blue[500]};''';
 
   ValueChanged onChanged;
-  String value;
   String placeholder;
   bool focused = false;
 
+  String _value = '';
   bool _isAttachedToKeyboard = false;
   EditableString _editableValue;
 
-  Input({Object key, this.value: '', this.placeholder, this.focused})
+  Input({Object key,
+         this.placeholder,
+         this.onChanged,
+         this.focused})
       : super(key: key, stateful: true) {
-    _editableValue = new EditableString(text: value,
+    _editableValue = new EditableString(text: _value,
                                         onUpdated: _handleTextUpdated);
   }
 
   void _handleTextUpdated() {
     setState(() {});
-    if (value != _editableValue.text) {
-      value = _editableValue.text;
+    if (_value != _editableValue.text) {
+      _value = _editableValue.text;
       if (onChanged != null)
-        onChanged(value);
+        onChanged(_value);
     }
   }
 
@@ -70,7 +73,7 @@ class Input extends Component {
 
     List<Node> children = [];
 
-    if (placeholder != null && value.isEmpty) {
+    if (placeholder != null && _value.isEmpty) {
       children.add(new Container(
           style: _placeholderStyle,
           children: [new Text(placeholder)]