more type parameters

examples/material_gallery/lib/demo/grid_list_demo.dart

@@ -138,16 +138,16 @@ class GridListDemoState extends State<GridListDemo> {
   GridDemoTileStyle tileStyle = GridDemoTileStyle.twoLine;
 
   void showTileStyleMenu(BuildContext context) {
-    final List<PopupMenuItem> items = <PopupMenuItem>[
-      new PopupMenuItem(
+    final List<PopupMenuItem> items = <PopupMenuItem<GridDemoTileStyle>>[
+      new PopupMenuItem<GridDemoTileStyle>(
         value: GridDemoTileStyle.imageOnly,
         child: new Text('Image only')
       ),
-      new PopupMenuItem(
+      new PopupMenuItem<GridDemoTileStyle>(
         value: GridDemoTileStyle.oneLine,
         child: new Text('One line')
       ),
-      new PopupMenuItem(
+      new PopupMenuItem<GridDemoTileStyle>(
         value: GridDemoTileStyle.twoLine,
         child: new Text('Two line')
       )

examples/material_gallery/lib/demo/menu_demo.dart

@@ -61,16 +61,16 @@ class MenuDemoState extends State<MenuDemo> {
         right: <Widget>[
           new PopupMenuButton<String>(
             onSelected: showMenuSelection,
-            items: <PopupMenuItem>[
-              new PopupMenuItem(
+            items: <PopupMenuItem<String>>[
+              new PopupMenuItem<String>(
                 value: 'ToolBar Menu',
                 child: new Text('ToolBar Menu')
               ),
-              new PopupMenuItem(
+              new PopupMenuItem<String>(
                 value: 'Right Here',
                 child: new Text('Right Here')
               ),
-              new PopupMenuItem(
+              new PopupMenuItem<String>(
                 value: 'Hooray!',
                 child: new Text('Hooray!')
               ),
@@ -88,16 +88,16 @@ class MenuDemoState extends State<MenuDemo> {
             primary: new Text('An item with a context menu button'),
             right: new PopupMenuButton<String>(
               onSelected: showMenuSelection,
-              items: <PopupMenuItem>[
-                new PopupMenuItem(
+              items: <PopupMenuItem<String>>[
+                new PopupMenuItem<String>(
                   value: _simpleValue1,
                   child: new Text('Context menu item one')
                 ),
-                new PopupMenuItem(
+                new PopupMenuItem<String>(
                   enabled: false,
                   child: new Text('A disabled menu item')
                 ),
-                new PopupMenuItem(
+                new PopupMenuItem<String>(
                   value: _simpleValue3,
                   child: new Text('Context menu item three')
                 ),
@@ -112,21 +112,21 @@ class MenuDemoState extends State<MenuDemo> {
             right: new PopupMenuButton<String>(
               onSelected: showMenuSelection,
               items: <PopupMenuEntry<String>>[
-                new PopupMenuItem(
+                new PopupMenuItem<String>(
                   value: 'Preview',
                   child: new ListItem(
                     left: new Icon(icon: Icons.visibility),
                     primary: new Text('Preview')
                   )
                 ),
-                new PopupMenuItem(
+                new PopupMenuItem<String>(
                   value: 'Share',
                   child: new ListItem(
                     left: new Icon(icon: Icons.person_add),
                     primary: new Text('Share')
                   )
                 ),
-                new PopupMenuItem(
+                new PopupMenuItem<String>(
                   value: 'Get Link',
                   child: new ListItem(
                     left: new Icon(icon: Icons.link),
@@ -134,7 +134,7 @@ class MenuDemoState extends State<MenuDemo> {
                   )
                 ),
                 new PopupMenuDivider(),
-                new PopupMenuItem(
+                new PopupMenuItem<String>(
                   value: 'Remove',
                   child: new ListItem(
                     left: new Icon(icon: Icons.delete),
@@ -154,16 +154,16 @@ class MenuDemoState extends State<MenuDemo> {
               primary: new Text('An item with a simple menu'),
               secondary: new Text(_simpleValue)
             ),
-            items: <PopupMenuItem>[
-              new PopupMenuItem(
+            items: <PopupMenuItem<String>>[
+              new PopupMenuItem<String>(
                 value: _simpleValue1,
                 child: new Text(_simpleValue1)
               ),
-              new PopupMenuItem(
+              new PopupMenuItem<String>(
                 value: _simpleValue2,
                 child: new Text(_simpleValue2)
               ),
-              new PopupMenuItem(
+              new PopupMenuItem<String>(
                 value: _simpleValue3,
                 child: new Text(_simpleValue3)
               )
@@ -175,23 +175,24 @@ class MenuDemoState extends State<MenuDemo> {
             primary: new Text('An item with a checklist menu'),
             right: new PopupMenuButton<String>(
               onSelected: showCheckedMenuSelections,
-              items: <PopupMenuItem>[
+              items: <PopupMenuItem<String>>[
                 new CheckedPopupMenuItem(
                   value: _checkedValue1,
                   checked: isChecked(_checkedValue1),
                   child: new Text(_checkedValue1)
                 ),
-                new CheckedPopupMenuItem(
+                new CheckedPopupMenuItem<String>(
+                  value: _checkedValue2,
                   enabled: false,
                   checked: isChecked(_checkedValue2),
                   child: new Text(_checkedValue2)
                 ),
-                new CheckedPopupMenuItem(
+                new CheckedPopupMenuItem<String>(
                   value: _checkedValue3,
                   checked: isChecked(_checkedValue3),
                   child: new Text(_checkedValue3)
                 ),
-                new CheckedPopupMenuItem(
+                new CheckedPopupMenuItem<String>(
                   value: _checkedValue4,
                   checked: isChecked(_checkedValue4),
                   child: new Text(_checkedValue4)

examples/stocks/lib/stock_home.dart

@@ -218,21 +218,21 @@ class StockHomeState extends State<StockHome> {
         ),
         new PopupMenuButton<_StockMenuItem>(
           onSelected: (_StockMenuItem value) { _handleStockMenu(context, value); },
-          items: <PopupMenuItem>[
-            new CheckedPopupMenuItem(
+          items: <PopupMenuItem<_StockMenuItem>>[
+            new CheckedPopupMenuItem<_StockMenuItem>(
               value: _StockMenuItem.autorefresh,
               checked: _autorefresh,
               child: new Text('Autorefresh')
             ),
-            new PopupMenuItem(
+            new PopupMenuItem<_StockMenuItem>(
               value: _StockMenuItem.refresh,
               child: new Text('Refresh')
             ),
-            new PopupMenuItem(
+            new PopupMenuItem<_StockMenuItem>(
               value: _StockMenuItem.speedUp,
               child: new Text('Increase animation speed')
             ),
-            new PopupMenuItem(
+            new PopupMenuItem<_StockMenuItem>(
               value: _StockMenuItem.speedDown,
               child: new Text('Decrease animation speed')
             )

examples/widgets/indexed_stack.dart

@@ -19,18 +19,22 @@ class IndexedStackDemoState extends State<IndexedStackDemo> {
     });
   }
 
-  List<PopupMenuItem> _buildMenu() {
+  List<PopupMenuItem<int>> _buildMenu() {
     TextStyle style = const TextStyle(fontSize: 18.0, fontWeight: FontWeight.bold);
     String pad = '';
     return new List<PopupMenuItem>.generate(_itemCount, (int i) {
       pad += '-';
-      return new PopupMenuItem(value: i, child: new Text('$pad Hello World $i $pad', style: style));
+      return new PopupMenuItem<int>(value: i, child: new Text('$pad Hello World $i $pad', style: style));
     });
   }
 
   Widget build(BuildContext context) {
-    List<PopupMenuItem> items = _buildMenu();
-    IndexedStack indexedStack = new IndexedStack(children: items, index: _itemIndex, alignment: const FractionalOffset(0.5, 0.0));
+    List<PopupMenuItem<int>> items = _buildMenu();
+    IndexedStack indexedStack = new IndexedStack(
+      children: items,
+      index: _itemIndex,
+      alignment: const FractionalOffset(0.5, 0.0)
+    );
 
     return new Scaffold(
       toolBar: new ToolBar(center: new Text('IndexedStackDemo Demo')),