Change several onStatusChanged callbacks to onDismissed.

We only use them for the transition to dismissed.

packages/flutter/example/fitness/lib/feed.dart

@@ -96,7 +96,7 @@ class FeedFragment extends StatefulComponent {
     return new Drawer(
       showing: _drawerShowing,
       level: 3,
-      onStatusChanged: _handleDrawerStatusChange,
+      onDismissed: _handleDrawerDismissed,
       navigator: navigator,
       children: [
         new DrawerHeader(children: [new Text('Fitness')]),
@@ -132,9 +132,9 @@ class FeedFragment extends StatefulComponent {
     });
   }
 
-  void _handleDrawerStatusChange(AnimationStatus status) {
+  void _handleDrawerDismissed() {
     setState(() {
-      _drawerStatus = status;
+      _drawerStatus = AnimationStatus.dismissed;
     });
   }
 

packages/flutter/example/stocks/lib/stock_home.dart

@@ -68,9 +68,9 @@ class StockHome extends StatefulComponent {
     });
   }
 
-  void _handleDrawerStatusChange(AnimationStatus status) {
+  void _handleDrawerDismissed() {
     setState(() {
-      _drawerStatus = status;
+      _drawerStatus = AnimationStatus.dismissed;
     });
   }
 
@@ -90,9 +90,9 @@ class StockHome extends StatefulComponent {
     });
   }
 
-  void _handleMenuStatusChanged(AnimationStatus status) {
+  void _handleMenuDismissed() {
     setState(() {
-      _menuStatus = status;
+      _menuStatus = AnimationStatus.dismissed;
     });
   }
 
@@ -119,7 +119,7 @@ class StockHome extends StatefulComponent {
     return new Drawer(
       level: 3,
       showing: _drawerShowing,
-      onStatusChanged: _handleDrawerStatusChange,
+      onDismissed: _handleDrawerDismissed,
       navigator: navigator,
       children: [
         new DrawerHeader(children: [new Text('Stocks')]),
@@ -254,7 +254,7 @@ class StockHome extends StatefulComponent {
       showing: _isSnackBarShowing,
       content: new Text("Stock purchased!"),
       actions: [new SnackBarAction(label: "UNDO", onPressed: _handleUndo)],
-      onStatusChanged: (status) { setState(() { _snackBarStatus = status; }); }
+      onDismissed: () { setState(() { _snackBarStatus = AnimationStatus.dismissed; }); }
     );
   }
 
@@ -279,7 +279,7 @@ class StockHome extends StatefulComponent {
     overlays.add(new ModalOverlay(
       children: [new StockMenu(
         showing: _menuShowing,
-        onStatusChanged: _handleMenuStatusChanged,
+        onDismissed: _handleMenuDismissed,
         navigator: navigator,
         autorefresh: _autorefresh,
         onAutorefreshChanged: _handleAutorefreshChanged

packages/flutter/example/stocks/lib/stock_menu.dart

@@ -8,14 +8,14 @@ class StockMenu extends Component {
   StockMenu({
     Key key,
     this.showing,
-    this.onStatusChanged,
+    this.onDismissed,
     this.navigator,
     this.autorefresh: false,
     this.onAutorefreshChanged
   }) : super(key: key);
 
   final bool showing;
-  final PopupMenuStatusChangedCallback onStatusChanged;
+  final PopupMenuDismissedCallback onDismissed;
   final Navigator navigator;
   final bool autorefresh;
   final ValueChanged onAutorefreshChanged;
@@ -38,7 +38,7 @@ class StockMenu extends Component {
         ],
         level: 4,
         showing: showing,
-        onStatusChanged: onStatusChanged,
+        onDismissed: onDismissed,
         navigator: navigator
       ),
       right: sky.view.paddingRight,

packages/flutter/lib/widgets/drawer.dart

@@ -40,7 +40,7 @@ const Duration _kThemeChangeDuration = const Duration(milliseconds: 200);
 const Point _kOpenPosition = Point.origin;
 const Point _kClosedPosition = const Point(-_kWidth, 0.0);
 
-typedef void DrawerStatusChangedCallback(AnimationStatus status);
+typedef void DrawerDismissedCallback();
 
 class Drawer extends StatefulComponent {
   Drawer({
@@ -48,14 +48,14 @@ class Drawer extends StatefulComponent {
     this.children,
     this.showing: false,
     this.level: 0,
-    this.onStatusChanged,
+    this.onDismissed,
     this.navigator
   }) : super(key: key);
 
   List<Widget> children;
   bool showing;
   int level;
-  DrawerStatusChangedCallback onStatusChanged;
+  DrawerDismissedCallback onDismissed;
   Navigator navigator;
 
   AnimationPerformance _performance;
@@ -80,7 +80,7 @@ class Drawer extends StatefulComponent {
     level = source.level;
     navigator = source.navigator;
     showing = source.showing;
-    onStatusChanged = source.onStatusChanged;
+    onDismissed = source.onDismissed;
   }
 
   Widget build() {
@@ -120,18 +120,13 @@ class Drawer extends StatefulComponent {
   }
 
   void _onDismissed() {
-    _onStatusChanged(AnimationStatus.dismissed);
-  }
-
-  void _onStatusChanged(AnimationStatus status) {
     scheduleMicrotask(() {
-      if (status == AnimationStatus.dismissed &&
-          navigator != null &&
+      if (navigator != null &&
           navigator.currentRoute is RouteState &&
           (navigator.currentRoute as RouteState).owner == this) // TODO(ianh): remove cast once analyzer is cleverer
         navigator.pop();
-      if (onStatusChanged != null)
-        onStatusChanged(status);
+      if (onDismissed != null)
+        onDismissed();
     });
   }
 

packages/flutter/lib/widgets/popup_menu.dart

@@ -27,21 +27,21 @@ const double _kMenuMaxWidth = 5.0 * _kMenuWidthStep;
 const double _kMenuHorizontalPadding = 16.0;
 const double _kMenuVerticalPadding = 8.0;
 
-typedef void PopupMenuStatusChangedCallback(AnimationStatus status);
+typedef void PopupMenuDismissedCallback();
 
 class PopupMenu extends StatefulComponent {
 
   PopupMenu({
     Key key,
     this.showing,
-    this.onStatusChanged,
+    this.onDismissed,
     this.items,
     this.level,
     this.navigator
   }) : super(key: key);
 
   bool showing;
-  PopupMenuStatusChangedCallback onStatusChanged;
+  PopupMenuDismissedCallback onDismissed;
   List<PopupMenuItem> items;
   int level;
   Navigator navigator;
@@ -63,7 +63,6 @@ class PopupMenu extends StatefulComponent {
     if (!showing && source.showing)
       _open();
     showing = source.showing;
-    onStatusChanged = source.onStatusChanged;
     if (level != source.level) {
       level = source.level;
       _updateBoxPainter();
@@ -96,8 +95,8 @@ class PopupMenu extends StatefulComponent {
         navigator.currentRoute is RouteState &&
         (navigator.currentRoute as RouteState).owner == this) // TODO(ianh): remove cast once analyzer is cleverer
       navigator.pop();
-    if (onStatusChanged != null)
-      onStatusChanged(AnimationStatus.dismissed);
+    if (onDismissed != null)
+      onDismissed();
   }
 
   BoxPainter _painter;

packages/flutter/lib/widgets/snack_bar.dart

@@ -16,7 +16,7 @@ import 'package:sky/widgets/transitions.dart';
 
 export 'package:sky/animation/animation_performance.dart' show AnimationStatus;
 
-typedef void SnackBarStatusChangedCallback(AnimationStatus status);
+typedef void SnackBarDismissedCallback();
 
 const Duration _kSlideInDuration = const Duration(milliseconds: 200);
 
@@ -46,7 +46,7 @@ class SnackBar extends Component {
     this.content,
     this.actions,
     this.showing,
-    this.onStatusChanged
+    this.onDismissed
   }) : super(key: key) {
     assert(content != null);
   }
@@ -54,11 +54,11 @@ class SnackBar extends Component {
   Widget content;
   List<SnackBarAction> actions;
   bool showing;
-  SnackBarStatusChangedCallback onStatusChanged;
+  SnackBarDismissedCallback onDismissed;
 
   void _onDismissed() {
-    if (onStatusChanged != null)
-      scheduleMicrotask(() { onStatusChanged(AnimationStatus.dismissed); });
+    if (onDismissed != null)
+      scheduleMicrotask(() { onDismissed(); });
   }
 
   Widget build() {