Model ink splashes more physically

packages/flutter/lib/src/animation/animated_value.dart

@@ -58,26 +58,27 @@ class AnimationTiming {
   }
 }
 
-/// An animated variable with a concrete type
+/// An animated variable with a concrete type.
 class AnimatedValue<T extends dynamic> extends AnimationTiming implements Animatable {
   AnimatedValue(this.begin, { this.end, Curve curve, Curve reverseCurve })
     : super(curve: curve, reverseCurve: reverseCurve) {
     value = begin;
   }
 
-  /// The current value of this variable
+  /// The current value of this variable.
   T value;
 
-  /// The value this variable has at the beginning of the animation
+  /// The value this variable has at the beginning of the animation.
   T begin;
 
-  /// The value this variable has at the end of the animation
+  /// The value this variable has at the end of the animation.
   T end;
 
-  /// Returns the value this variable has at the given animation clock value
+  /// Returns the value this variable has at the given animation clock value.
   T lerp(double t) => begin + (end - begin) * t;
 
-  /// Updates the value of this variable according to the given animation clock value and direction
+  /// Updates the value of this variable according to the given animation clock
+  /// value and direction.
   void setProgress(double t, AnimationDirection direction) {
     if (end != null) {
       t = transform(t, direction);
@@ -93,7 +94,7 @@ class AnimatedValue<T extends dynamic> extends AnimationTiming implements Animat
   String toString() => 'AnimatedValue(begin=$begin, end=$end, value=$value)';
 }
 
-/// An animated variable containing a color
+/// An animated variable containing a color.
 ///
 /// This class specializes the interpolation of AnimatedValue<Color> to be
 /// appropriate for colors.
@@ -104,9 +105,9 @@ class AnimatedColorValue extends AnimatedValue<Color> {
   Color lerp(double t) => Color.lerp(begin, end, t);
 }
 
-/// An animated variable containing a rectangle
+/// An animated variable containing a size.
 ///
-/// This class specializes the interpolation of AnimatedValue<Rect> to be
+/// This class specializes the interpolation of AnimatedValue<Size> to be
 /// appropriate for rectangles.
 class AnimatedSizeValue extends AnimatedValue<Size> {
   AnimatedSizeValue(Size begin, { Size end, Curve curve, Curve reverseCurve })
@@ -115,7 +116,7 @@ class AnimatedSizeValue extends AnimatedValue<Size> {
   Size lerp(double t) => Size.lerp(begin, end, t);
 }
 
-/// An animated variable containing a rectangle
+/// An animated variable containing a rectangle.
 ///
 /// This class specializes the interpolation of AnimatedValue<Rect> to be
 /// appropriate for rectangles.
@@ -125,3 +126,15 @@ class AnimatedRectValue extends AnimatedValue<Rect> {
 
   Rect lerp(double t) => Rect.lerp(begin, end, t);
 }
+
+/// An animated variable containing a int.
+///
+/// The inherited lerp() function doesn't work with ints because it multiplies
+/// the begin and end types by a double, and int * double returns a double.
+/// This class overrides the lerp() function to round off the result to an int.
+class AnimatedIntValue extends AnimatedValue<int> {
+  AnimatedIntValue(int begin, { int end, Curve curve, Curve reverseCurve })
+    : super(begin, end: end, curve: curve, reverseCurve: reverseCurve);
+
+  int lerp(double t) => (begin + (end - begin) * t).round();
+}

packages/flutter/lib/src/material/colors.dart

@@ -14,11 +14,13 @@ class Colors {
   static const black   = const Color(0xFF000000);
   static const black87 = const Color(0xDD000000);
   static const black54 = const Color(0x8A000000);
-  static const black26 = const Color(0x42000000); // disabled radio buttons and text of disabled flat buttons in light theme (26% black)
+  static const black45 = const Color(0x73000000); // mask color
+  static const black26 = const Color(0x42000000); // disabled radio buttons and text of disabled flat buttons in light theme
   static const black12 = const Color(0x1F000000); // background of disabled raised buttons in light theme
+
   static const white   = const Color(0xFFFFFFFF);
   static const white70 = const Color(0xB3FFFFFF);
-  static const white30 = const Color(0x4DFFFFFF); // disabled radio buttons and text of disabled flat buttons in dark theme (30% white)
+  static const white30 = const Color(0x4DFFFFFF); // disabled radio buttons and text of disabled flat buttons in dark theme
   static const white12 = const Color(0x1FFFFFFF); // background of disabled raised buttons in dark theme
   static const white10 = const Color(0x1AFFFFFF);
 

packages/flutter/lib/src/material/drawer_item.dart

@@ -10,33 +10,37 @@ import 'ink_well.dart';
 import 'theme.dart';
 
 class DrawerItem extends StatelessComponent {
-  const DrawerItem({ Key key, this.icon, this.child, this.onPressed, this.selected: false })
-    : super(key: key);
+  const DrawerItem({
+    Key key,
+    this.icon,
+    this.child,
+    this.onPressed,
+    this.selected: false
+  }) : super(key: key);
 
   final String icon;
   final Widget child;
   final VoidCallback onPressed;
   final bool selected;
 
+  ColorFilter _getIconColorFilter(ThemeData themeData) {
+    if (selected) {
+      if (themeData.brightness == ThemeBrightness.dark)
+        return new ColorFilter.mode(themeData.accentColor, TransferMode.srcATop);
+      return new ColorFilter.mode(themeData.primaryColor, TransferMode.srcATop);
+    }
+    return new ColorFilter.mode(Colors.black45, TransferMode.dstIn);
+  }
+
   TextStyle _getTextStyle(ThemeData themeData) {
     TextStyle result = themeData.text.body2;
-    if (selected)
+    if (selected) {
+      if (themeData.brightness == ThemeBrightness.dark)
+        result = result.copyWith(color: themeData.accentColor);
+      else
         result = result.copyWith(color: themeData.primaryColor);
-    return result;
     }
-
-  Color _getBackgroundColor(ThemeData themeData, { bool highlight }) {
-    if (highlight)
-      return themeData.highlightColor;
-    if (selected)
-      return themeData.selectedColor;
-    return Colors.transparent;
-  }
-
-  ColorFilter _getColorFilter(ThemeData themeData) {
-    if (selected)
-      return new ColorFilter.mode(themeData.primaryColor, TransferMode.srcATop);
-    return new ColorFilter.mode(const Color(0x73000000), TransferMode.dstIn);
+    return result;
   }
 
   Widget build(BuildContext context) {
@@ -49,7 +53,7 @@ class DrawerItem extends StatelessComponent {
           padding: const EdgeDims.symmetric(horizontal: 16.0),
           child: new Icon(
             icon: icon,
-            colorFilter: _getColorFilter(themeData)
+            colorFilter: _getIconColorFilter(themeData)
           )
         )
       );
@@ -70,8 +74,6 @@ class DrawerItem extends StatelessComponent {
       height: 48.0,
       child: new InkWell(
         onTap: onPressed,
-        defaultColor: _getBackgroundColor(themeData, highlight: false),
-        highlightColor: _getBackgroundColor(themeData, highlight: true),
         child: new Row(flexChildren)
       )
     );

packages/flutter/lib/src/material/flat_button.dart

@@ -4,7 +4,6 @@
 
 import 'package:flutter/widgets.dart';
 
-import 'colors.dart';
 import 'material_button.dart';
 import 'theme.dart';
 
@@ -12,11 +11,27 @@ class FlatButton extends MaterialButton {
   FlatButton({
     Key key,
     Widget child,
+    ButtonColor textTheme,
+    Color textColor,
+    Color disabledTextColor,
+    this.color,
+    this.colorBrightness,
+    this.disabledColor,
     VoidCallback onPressed
   }) : super(key: key,
              child: child,
+             textTheme: textTheme,
+             textColor: textColor,
+             disabledTextColor: disabledTextColor,
              onPressed: onPressed);
 
+  // These default to null, meaning transparent.
+  final Color color;
+  final Color disabledColor;
+
+  /// Controls the default text color if the text color isn't explicit set.
+  final ThemeBrightness colorBrightness;
+
   _FlatButtonState createState() => new _FlatButtonState();
 }
 
@@ -24,19 +39,14 @@ class _FlatButtonState extends MaterialButtonState<FlatButton> {
 
   int get elevation => 0;
 
-  Color getColor(BuildContext context, { bool highlight }) {
-    if (!config.enabled || !highlight)
-      return null;
-    switch (Theme.of(context).brightness) {
-      case ThemeBrightness.light:
-        return Colors.grey[400];
-      case ThemeBrightness.dark:
-        return Colors.grey[200];
-    }
+  Color getColor(BuildContext context) {
+    if (!config.enabled)
+      return config.disabledColor;
+    return config.color;
   }
 
   ThemeBrightness getColorBrightness(BuildContext context) {
-    return Theme.of(context).brightness;
+    return config.colorBrightness ?? Theme.of(context).brightness;
   }
 
 }

packages/flutter/lib/src/material/floating_action_button.dart

@@ -19,12 +19,16 @@ class FloatingActionButton extends StatefulComponent {
     Key key,
     this.child,
     this.backgroundColor,
+    this.elevation: 6,
+    this.highlightElevation: 12,
     this.onPressed
   }) : super(key: key);
 
   final Widget child;
   final Color backgroundColor;
   final VoidCallback onPressed;
+  final int elevation;
+  final int highlightElevation;
 
   _FloatingActionButtonState createState() => new _FloatingActionButtonState();
 }
@@ -50,8 +54,7 @@ class _FloatingActionButtonState extends State<FloatingActionButton> {
     return new Material(
       color: materialColor,
       type: MaterialType.circle,
-      elevation: _highlight ? 12 : 6,
-      child: new ClipOval(
+      elevation: _highlight ? config.highlightElevation : config.elevation,
       child: new Container(
         width: _kSize,
         height: _kSize,
@@ -66,7 +69,6 @@ class _FloatingActionButtonState extends State<FloatingActionButton> {
           )
         )
       )
-      )
     );
   }
 }

packages/flutter/lib/src/material/icon_button.dart

@@ -6,6 +6,7 @@ import 'package:flutter/widgets.dart';
 
 import 'icon.dart';
 import 'icon_theme_data.dart';
+import 'ink_well.dart';
 
 class IconButton extends StatelessComponent {
   const IconButton({
@@ -22,11 +23,8 @@ class IconButton extends StatelessComponent {
   final VoidCallback onPressed;
 
   Widget build(BuildContext context) {
-    // TODO(abarth): We should use a radial reaction here so you can hit the
-    // 8.0 pixel padding as well as the icon.
-    return new GestureDetector(
+    return new InkResponse(
       onTap: onPressed,
-      behavior: HitTestBehavior.opaque,
       child: new Padding(
         padding: const EdgeDims.all(8.0),
         child: new Icon(

packages/flutter/lib/src/material/material_button.dart

@@ -36,12 +36,16 @@ abstract class MaterialButton extends StatefulComponent {
   MaterialButton({
     Key key,
     this.child,
+    this.textTheme,
     this.textColor,
+    this.disabledTextColor,
     this.onPressed
   }) : super(key: key);
 
   final Widget child;
-  final ButtonColor textColor;
+  final ButtonColor textTheme;
+  final Color textColor;
+  final Color disabledTextColor;
   final VoidCallback onPressed;
 
   bool get enabled => onPressed != null;
@@ -57,12 +61,14 @@ abstract class MaterialButtonState<T extends MaterialButton> extends State<T> {
   bool highlight = false;
 
   int get elevation;
-  Color getColor(BuildContext context, { bool highlight });
+  Color getColor(BuildContext context);
   ThemeBrightness getColorBrightness(BuildContext context);
 
   Color getTextColor(BuildContext context) {
     if (config.enabled) {
-      switch (config.textColor ?? ButtonTheme.of(context)) {
+      if (config.textColor != null)
+        return config.textColor;
+      switch (config.textTheme ?? ButtonTheme.of(context)) {
         case ButtonColor.accent:
           return Theme.of(context).accentColor;
         case ButtonColor.normal:
@@ -74,6 +80,8 @@ abstract class MaterialButtonState<T extends MaterialButton> extends State<T> {
           }
       }
     }
+    if (config.disabledTextColor != null)
+      return config.disabledTextColor;
     switch (getColorBrightness(context)) {
       case ThemeBrightness.light:
         return Colors.black26;
@@ -84,34 +92,45 @@ abstract class MaterialButtonState<T extends MaterialButton> extends State<T> {
 
   void _handleHighlightChanged(bool value) {
     setState(() {
+      // mostly just used by the RaisedButton subclass to change the elevation
       highlight = value;
     });
   }
 
   Widget build(BuildContext context) {
-    Widget contents = new Container(
+    Widget contents = new InkWell(
+      onTap: config.onPressed,
+      onHighlightChanged: _handleHighlightChanged,
+      child: new Container(
         padding: new EdgeDims.symmetric(horizontal: 8.0),
         child: new Center(
           widthFactor: 1.0,
           child: config.child
         )
+      )
+    );
+    TextStyle style = Theme.of(context).text.button.copyWith(color: getTextColor(context));
+    int elevation = this.elevation;
+    Color color = getColor(context);
+    if (elevation > 0 || color != null) {
+      contents = new Material(
+        type: MaterialType.button,
+        color: getColor(context),
+        elevation: elevation,
+        textStyle: style,
+        child: contents
+      );
+    } else {
+      contents = new DefaultTextStyle(
+        style: style,
+        child: contents
       );
+    }
     return new Container(
       height: 36.0,
       constraints: new BoxConstraints(minWidth: 88.0),
       margin: new EdgeDims.all(8.0),
-      child: new Material(
-        type: MaterialType.button,
-        elevation: elevation,
-        textStyle: Theme.of(context).text.button.copyWith(color: getTextColor(context)),
-        child: new InkWell(
-          onTap: config.enabled ? config.onPressed : null,
-          defaultColor: getColor(context, highlight: false),
-          highlightColor: getColor(context, highlight: true),
-          onHighlightChanged: _handleHighlightChanged,
       child: contents
-        )
-      )
     );
   }
 }

packages/flutter/lib/src/material/raised_button.dart

@@ -12,36 +12,56 @@ class RaisedButton extends MaterialButton {
   RaisedButton({
     Key key,
     Widget child,
+    this.color,
+    this.colorBrightness,
+    this.disabledColor,
+    this.elevation: 2,
+    this.highlightElevation: 8,
+    this.disabledElevation: 0,
     VoidCallback onPressed
   }) : super(key: key,
              child: child,
              onPressed: onPressed);
 
+  final Color color;
+  final Color disabledColor;
+
+  /// Controls the default text color if the text color isn't explicit set.
+  final ThemeBrightness colorBrightness;
+
+  final int elevation;
+  final int highlightElevation;
+  final int disabledElevation;
+
   _RaisedButtonState createState() => new _RaisedButtonState();
 }
 
 class _RaisedButtonState extends MaterialButtonState<RaisedButton> {
 
-  int get elevation => config.enabled ? (highlight ? 8 : 2) : 0;
+  int get elevation {
+    if (config.enabled) {
+      if (highlight)
+        return config.highlightElevation;
+      return config.elevation;
+    } else {
+      return config.disabledElevation;
+    }
+  }
 
-  Color getColor(BuildContext context, { bool highlight }) {
+  Color getColor(BuildContext context) {
     if (config.enabled) {
+      if (config.color != null)
+        return config.color;
       switch (Theme.of(context).brightness) {
         case ThemeBrightness.light:
-          if (highlight)
-            return Colors.grey[350];
-          else
           return Colors.grey[300];
-          break;
         case ThemeBrightness.dark:
           Map<int, Color> swatch = Theme.of(context).primarySwatch ?? Colors.blue;
-          if (highlight)
-            return swatch[700];
-          else
           return swatch[600];
-          break;
       }
     } else {
+      if (config.disabledColor != null)
+        return config.disabledColor;
       switch (Theme.of(context).brightness) {
         case ThemeBrightness.light:
           return Colors.black12;
@@ -52,7 +72,7 @@ class _RaisedButtonState extends MaterialButtonState<RaisedButton> {
   }
 
   ThemeBrightness getColorBrightness(BuildContext context) {
-    return Theme.of(context).brightness;
+    return config.colorBrightness ?? Theme.of(context).brightness;
   }
 
 }

packages/flutter/lib/src/material/scaffold.dart

@@ -115,7 +115,10 @@ class ScaffoldState extends State<Scaffold> {
     }
     ScaffoldFeatureController<SnackBar> controller;
     controller = new ScaffoldFeatureController<SnackBar>._(
-      snackbar.withPerformance(_snackBarPerformance),
+      // We provide a fallback key so that if back-to-back snackbars happen to
+      // match in structure, material ink splashes and highlights don't survive
+      // from one to the next.
+      snackbar.withPerformance(_snackBarPerformance, fallbackKey: new UniqueKey()),
       new Completer(),
       () {
         assert(_snackBars.first == controller);

packages/flutter/lib/src/material/snack_bar.dart

@@ -5,14 +5,18 @@
 import 'package:flutter/animation.dart';
 import 'package:flutter/widgets.dart';
 
+import 'flat_button.dart';
 import 'material.dart';
+import 'material_button.dart';
 import 'theme.dart';
+import 'theme_data.dart';
 import 'typography.dart';
 
 // https://www.google.com/design/spec/components/snackbars-toasts.html#snackbars-toasts-specs
 const double _kSideMargins = 24.0;
 const double _kSingleLineVerticalPadding = 14.0;
-const double _kMultiLineVerticalPadding = 24.0;
+const double _kMultiLineVerticalTopPadding = 24.0;
+const double _kMultiLineVerticalSpaceBetweenTextAndButtons = 10.0;
 const Color _kSnackBackground = const Color(0xFF323232);
 
 // TODO(ianh): We should check if the given text and actions are going to fit on
@@ -35,11 +39,11 @@ class SnackBarAction extends StatelessComponent {
   final VoidCallback onPressed;
 
   Widget build(BuildContext context) {
-    return new GestureDetector(
-      onTap: onPressed,
-      child: new Container(
+    return new Container(
       margin: const EdgeDims.only(left: _kSideMargins),
-        padding: const EdgeDims.symmetric(vertical: _kSingleLineVerticalPadding),
+      child: new FlatButton(
+        onPressed: onPressed,
+        textTheme: ButtonColor.accent,
         child: new Text(label)
       )
     );
@@ -77,6 +81,7 @@ class SnackBar extends StatelessComponent {
     ];
     if (actions != null)
       children.addAll(actions);
+    ThemeData theme = Theme.of(context);
     return new ClipRect(
       child: new AlignTransition(
         performance: performance,
@@ -87,12 +92,20 @@ class SnackBar extends StatelessComponent {
           color: _kSnackBackground,
           child: new Container(
             margin: const EdgeDims.symmetric(horizontal: _kSideMargins),
-            child: new DefaultTextStyle(
-              style: new TextStyle(color: Theme.of(context).accentColor),
+            child: new Theme(
+              data: new ThemeData(
+                brightness: ThemeBrightness.dark,
+                accentColor: theme.accentColor,
+                accentColorBrightness: theme.accentColorBrightness,
+                text: Typography.white
+              ),
               child: new FadeTransition(
                 performance: performance,
                 opacity: new AnimatedValue<double>(0.0, end: 1.0, curve: _snackBarFadeCurve),
-                child: new Row(children)
+                child: new Row(
+                  children,
+                  alignItems: FlexAlignItems.center
+                )
               )
             )
           )
@@ -110,9 +123,9 @@ class SnackBar extends StatelessComponent {
     );
   }
 
-  SnackBar withPerformance(Performance newPerformance) {
+  SnackBar withPerformance(Performance newPerformance, { Key fallbackKey }) {
     return new SnackBar(
-      key: key,
+      key: key ?? fallbackKey,
       content: content,
       actions: actions,
       duration: duration,

packages/flutter/lib/src/material/tabs.dart

@@ -10,11 +10,11 @@ import 'package:flutter/rendering.dart';
 import 'package:flutter/widgets.dart';
 
 import 'colors.dart';
-import 'constants.dart';
 import 'icon.dart';
 import 'icon_theme.dart';
 import 'icon_theme_data.dart';
 import 'ink_well.dart';
+import 'material.dart';
 import 'theme.dart';
 
 typedef void TabSelectedIndexChanged(int selectedIndex);
@@ -403,6 +403,10 @@ class TabBarSelection {
   int _previousIndex = 0;
 }
 
+/// A tab strip, consisting of several TabLabels and a TabBarSelection.
+/// The TabBarSelection can be used to link this to a TabBarView.
+///
+/// Tabs must always have an ancestor Material object.
 class TabBar extends Scrollable {
   TabBar({
     Key key,
@@ -551,13 +555,13 @@ class _TabBarState extends ScrollableState<TabBar> {
 
   Widget buildContent(BuildContext context) {
     assert(config.labels != null && config.labels.isNotEmpty);
+    assert(Material.of(context) != null);
 
     ThemeData themeData = Theme.of(context);
-    Color backgroundColor = themeData.primaryColor;
+    Color backgroundColor = Material.of(context).color;
     Color indicatorColor = themeData.accentColor;
-    if (indicatorColor == backgroundColor) {
+    if (indicatorColor == backgroundColor)
       indicatorColor = Colors.white;
-    }
 
     TextStyle textStyle = themeData.primaryTextTheme.body1;
     IconThemeData iconTheme = themeData.primaryIconTheme;
@@ -571,7 +575,7 @@ class _TabBarState extends ScrollableState<TabBar> {
         textAndIcons = true;
     }
 
-    Widget content = new IconTheme(
+    Widget contents = new IconTheme(
       data: iconTheme,
       child: new DefaultTextStyle(
         style: textStyle,
@@ -594,23 +598,17 @@ class _TabBarState extends ScrollableState<TabBar> {
     );
 
     if (config.isScrollable) {
-      content = new SizeObserver(
+      contents = new SizeObserver(
         onSizeChanged: _handleViewportSizeChanged,
         child: new Viewport(
           scrollDirection: ScrollDirection.horizontal,
           scrollOffset: new Offset(scrollOffset, 0.0),
-          child: content
+          child: contents
         )
       );
     }
 
-    return new AnimatedContainer(
-      decoration: new BoxDecoration(
-        backgroundColor: backgroundColor
-      ),
-      duration: kThemeChangeDuration,
-      child: content
-    );
+    return contents;
   }
 }
 

packages/flutter/lib/src/material/theme_data.dart

@@ -27,15 +27,7 @@ class ThemeData {
       // Some users want the pre-multiplied color, others just want the opacity.
       hintColor = brightness == ThemeBrightness.dark ? const Color(0x42FFFFFF) : const Color(0x4C000000),
       hintOpacity = brightness == ThemeBrightness.dark ? 0.26 : 0.30,
-      // TODO(eseidel): Where are highlight and selected colors documented?
-      // I flipped highlight/selected to match the News app (which is clearly not quite Material)
-      // Gmail has an interesting behavior of showing selected darker until
-      // you click on a different drawer item when the first one loses its
-      // selected color and becomes lighter, the ink then fills to make the new
-      // click dark to match the previous (resting) selected state.  States
-      // revert when you cancel the tap.
-      highlightColor = const Color(0x33999999),
-      selectedColor = const Color(0x66999999),
+      highlightColor = brightness == ThemeBrightness.dark ? const Color(0x42FFFFFF) : const Color(0x1F000000),
       text = brightness == ThemeBrightness.dark ? Typography.white : Typography.black {
     assert(brightness != null);
 
@@ -63,6 +55,13 @@ class ThemeData {
   /// The brightness of the overall theme of the application. Used by widgets
   /// like buttons to determine what color to pick when not using the primary or
   /// accent color.
+  ///
+  /// When the ThemeBrightness is dark, the canvas, card, and primary colors are
+  /// all dark. When the ThemeBrightness is light, the canvas and card colors
+  /// are bright, and the primary color's darkness varies as described by
+  /// primaryColorBrightness. The primaryColor does not contrast well with the
+  /// card and canvas colors when the brightness is dask; when the birghtness is
+  /// dark, use Colors.white or the accentColor for a contrasting color.
   final ThemeBrightness brightness;
 
   final Map<int, Color> primarySwatch;
@@ -71,8 +70,9 @@ class ThemeData {
   final Color dividerColor;
   final Color hintColor;
   final Color highlightColor;
-  final Color selectedColor;
   final double hintOpacity;
+
+  /// Text with a color that contrasts with the card and canvas colors.
   final TextTheme text;
 
   /// The background colour for major parts of the app (toolbars, tab bars, etc)
@@ -128,7 +128,6 @@ class ThemeData {
            (otherData.dividerColor == dividerColor) &&
            (otherData.hintColor == hintColor) &&
            (otherData.highlightColor == highlightColor) &&
-           (otherData.selectedColor == selectedColor) &&
            (otherData.hintOpacity == hintOpacity) &&
            (otherData.text == text) &&
            (otherData.primaryColorBrightness == primaryColorBrightness) &&
@@ -143,7 +142,6 @@ class ThemeData {
     value = 37 * value + dividerColor.hashCode;
     value = 37 * value + hintColor.hashCode;
     value = 37 * value + highlightColor.hashCode;
-    value = 37 * value + selectedColor.hashCode;
     value = 37 * value + hintOpacity.hashCode;
     value = 37 * value + text.hashCode;
     value = 37 * value + primaryColorBrightness.hashCode;

packages/flutter/lib/src/material/tool_bar.dart

@@ -7,7 +7,7 @@ import 'package:flutter/widgets.dart';
 import 'constants.dart';
 import 'icon_theme.dart';
 import 'icon_theme_data.dart';
-import 'shadows.dart';
+import 'material.dart';
 import 'tabs.dart';
 import 'theme.dart';
 import 'typography.dart';
@@ -36,9 +36,9 @@ class ToolBar extends StatelessComponent {
   final TextTheme textTheme;
   final EdgeDims padding;
 
-  ToolBar withPadding(EdgeDims newPadding) {
+  ToolBar withPadding(EdgeDims newPadding, { Key fallbackKey }) {
     return new ToolBar(
-      key: key,
+      key: key ?? fallbackKey,
       left: left,
       center: center,
       right: right,
@@ -67,52 +67,63 @@ class ToolBar extends StatelessComponent {
       sideStyle ??= primaryTextTheme.body2;
     }
 
-    List<Widget> children = new List<Widget>();
-
+    final List<Widget> firstRow = <Widget>[];
     if (left != null)
-      children.add(left);
-
-    children.add(
+      firstRow.add(left);
+    firstRow.add(
       new Flexible(
         child: new Padding(
-          child: center != null ? new DefaultTextStyle(child: center, style: centerStyle) : null,
-          padding: new EdgeDims.only(left: 24.0)
+          padding: new EdgeDims.only(left: 24.0),
+          child: center != null ? new DefaultTextStyle(style: centerStyle, child: center) : null
         )
       )
     );
-
     if (right != null)
-      children.addAll(right);
+      firstRow.addAll(right);
 
-    final List<Widget> columnChildren = <Widget>[
-      new Container(height: kToolBarHeight, child: new Row(children))
+    final List<Widget> rows = <Widget>[
+      new Container(
+        height: kToolBarHeight,
+        child: new DefaultTextStyle(
+          style: sideStyle,
+          child: new Row(firstRow)
+        )
+      )
     ];
-
-    if (bottom != null)
-      columnChildren.add(new DefaultTextStyle(
+    if (bottom != null) {
+      rows.add(
+        new DefaultTextStyle(
           style: centerStyle,
-        child: new Container(height: kExtendedToolBarHeight - kToolBarHeight, child: bottom)
-      ));
-
+          child: new Container(
+            height: kExtendedToolBarHeight - kToolBarHeight,
+            child: bottom
+          )
+        )
+      );
+    }
     if (tabBar != null)
-      columnChildren.add(tabBar);
+      rows.add(tabBar);
 
-    Widget content = new AnimatedContainer(
-      duration: kThemeChangeDuration,
-      padding: new EdgeDims.symmetric(horizontal: 8.0),
-      decoration: new BoxDecoration(
-        backgroundColor: color,
-        boxShadow: elevationToShadow[elevation]
-      ),
-      child: new DefaultTextStyle(
-        style: sideStyle,
-        child: new Container(padding: padding, child: new Column(columnChildren, justifyContent: FlexJustifyContent.collapse))
+    EdgeDims combinedPadding = new EdgeDims.symmetric(horizontal: 8.0);
+    if (padding != null)
+      combinedPadding += padding;
+
+    Widget contents = new Material(
+      color: color,
+      elevation: elevation,
+      child: new Container(
+        padding: combinedPadding,
+        child: new Column(
+          rows,
+          justifyContent: FlexJustifyContent.collapse
+        )
       )
     );
 
     if (iconThemeData != null)
-      content = new IconTheme(data: iconThemeData, child: content);
-    return content;
+      contents = new IconTheme(data: iconThemeData, child: contents);
+
+    return contents;
   }
 
 }

packages/flutter/lib/src/widgets/framework.dart

@@ -386,8 +386,17 @@ abstract class State<T extends StatefulComponent> {
     _element.markNeedsBuild();
   }
 
-  /// Called when this object is removed from the tree. Override this to clean
-  /// up any resources allocated by this object.
+  /// Called when this object is removed from the tree.
+  /// The object might momentarily be reattached to the tree elsewhere.
+  ///
+  /// Use this to clean up any links between this state and other
+  /// elements in the tree (e.g. if you have provided an ancestor with
+  /// a pointer to a descendant's renderObject).
+  void deactivate() { }
+
+  /// Called when this object is removed from the tree permanently.
+  /// Override this to clean up any resources allocated by this
+  /// object.
   ///
   /// If you override this, make sure to end your method with a call to
   /// super.dispose().
@@ -405,6 +414,11 @@ abstract class State<T extends StatefulComponent> {
   /// provides the set of inherited widgets for this location in the tree.
   Widget build(BuildContext context);
 
+  /// Called when an Inherited widget in the ancestor chain has changed. Usually
+  /// there is nothing to do here; whenever this is called, build() is also
+  /// called. 
+  void dependenciesChanged(Type affectedWidgetType) { }
+
   String toString() {
     final List<String> data = <String>[];
     debugFillDescription(data);
@@ -540,6 +554,7 @@ abstract class BuildContext {
   InheritedWidget inheritFromWidgetOfType(Type targetType);
   Widget ancestorWidgetOfType(Type targetType);
   State ancestorStateOfType(Type targetType);
+  RenderObject ancestorRenderObjectOfType(Type targetType);
   void visitAncestorElements(bool visitor(Element element));
   void visitChildElements(void visitor(Element element));
 }
@@ -777,7 +792,7 @@ abstract class Element<T extends Widget> implements BuildContext {
     assert(child._parent == this);
     child._parent = null;
     child.detachRenderObject();
-    _inactiveElements.add(child);
+    _inactiveElements.add(child); // this eventually calls child.deactivate()
   }
 
   void deactivate() {
@@ -839,13 +854,24 @@ abstract class Element<T extends Widget> implements BuildContext {
     return statefulAncestor?.state;
   }
 
+  RenderObject ancestorRenderObjectOfType(Type targetType) {
+    Element ancestor = _parent;
+    while (ancestor != null) {
+      if (ancestor is RenderObjectElement && ancestor.renderObject.runtimeType == targetType)
+        break;
+      ancestor = ancestor._parent;
+    }
+    RenderObjectElement renderObjectAncestor = ancestor;
+    return renderObjectAncestor?.renderObject;
+  }
+
   void visitAncestorElements(bool visitor(Element element)) {
     Element ancestor = _parent;
     while (ancestor != null && visitor(ancestor))
       ancestor = ancestor._parent;
   }
 
-  void dependenciesChanged() {
+  void dependenciesChanged(Type affectedWidgetType) {
     assert(false);
   }
 
@@ -1024,7 +1050,7 @@ abstract class BuildableElement<T extends Widget> extends Element<T> {
   /// Called by rebuild() after the appropriate checks have been made.
   void performRebuild();
 
-  void dependenciesChanged() {
+  void dependenciesChanged(Type affectedWidgetType) {
     markNeedsBuild();
   }
 
@@ -1169,6 +1195,11 @@ class StatefulComponentElement<T extends StatefulComponent, U extends State<T>>
     rebuild();
   }
 
+  void deactivate() {
+    _state.deactivate();
+    super.deactivate();
+  }
+
   void unmount() {
     super.unmount();
     _state.dispose();
@@ -1183,6 +1214,11 @@ class StatefulComponentElement<T extends StatefulComponent, U extends State<T>>
     _state = null;
   }
 
+  void dependenciesChanged(Type affectedWidgetType) {
+    super.dependenciesChanged(affectedWidgetType);
+    _state.dependenciesChanged(affectedWidgetType);
+  }
+
   void debugFillDescription(List<String> description) {
     super.debugFillDescription(description);
     if (state != null)
@@ -1252,7 +1288,7 @@ class InheritedElement extends ProxyElement<InheritedWidget> {
     void notifyChildren(Element child) {
       if (child._dependencies != null &&
           child._dependencies.contains(ourRuntimeType)) {
-        child.dependenciesChanged();
+        child.dependenciesChanged(ourRuntimeType);
       }
       if (child.runtimeType != ourRuntimeType)
         child.visitChildren(notifyChildren);

packages/flutter/lib/src/widgets/notification_listener.dart

+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'framework.dart';
+
+/// Return true to cancel the notification bubbling.
+typedef bool NotificationListenerCallback<T extends Notification>(T notification);
+
+abstract class Notification {
+  void dispatch(BuildContext target) {
+    target.visitAncestorElements((Element element) {
+      if (element is StatelessComponentElement &&
+          element.widget is NotificationListener) {
+        final NotificationListener widget = element.widget;
+        if (widget._dispatch(this))
+          return false;
+      }
+      return true;
+    });
+  }
+}
+
+class NotificationListener<T extends Notification> extends StatelessComponent {
+  NotificationListener({
+    Key key,
+    this.child,
+    this.onNotification
+  }) : super(key: key);
+
+  final Widget child;
+  final NotificationListenerCallback<T> onNotification;
+
+  bool _dispatch(Notification notification) {
+    if (onNotification != null && notification is T)
+      return onNotification(notification);
+    return false;
+  }
+
+  Widget build(BuildContext context) => child;
+}
+
+/// Indicates that the layout of one of the descendants of the object receiving
+/// this notification has changed in some way, and that therefore any
+/// assumptions about that layout are no longer valid.
+///
+/// Useful if, for instance, you're trying to align multiple descendants.
+///
+/// Be aware that in the widgets library, only the [Scrollable] classes dispatch
+/// this notification. (Transitions, in particular, do not.) Changing one's
+/// layout in one's build function does not cause this notification to be
+/// dispatched automatically. If an ancestor expects to be notified for any
+/// layout change, make sure you only use widgets that either never change
+/// layout, or that do notify their ancestors when appropriate.
+class LayoutChangedNotification extends Notification { }

packages/flutter/lib/src/widgets/scrollable.dart

@@ -16,6 +16,7 @@ import 'framework.dart';
 import 'gesture_detector.dart';
 import 'homogeneous_viewport.dart';
 import 'mixed_viewport.dart';
+import 'notification_listener.dart';
 import 'page_storage.dart';
 
 // The gesture velocity properties are pixels/second, config min,max limits are pixels/ms
@@ -50,6 +51,8 @@ abstract class Scrollable extends StatefulComponent {
   final ScrollListener onScrollEnd;
   final SnapOffsetCallback snapOffsetCallback;
   final double snapAlignmentOffset;
+
+  ScrollableState createState();
 }
 
 abstract class ScrollableState<T extends Scrollable> extends State<T> {
@@ -180,6 +183,7 @@ abstract class ScrollableState<T extends Scrollable> extends State<T> {
       _scrollOffset = newScrollOffset;
     });
     PageStorage.of(context)?.writeState(context, _scrollOffset);
+    new ScrollNotification(this, _scrollOffset).dispatch(context);
     dispatchOnScroll();
   }
 
@@ -271,6 +275,12 @@ ScrollableState findScrollableAncestor(BuildContext context) {
   return result;
 }
 
+class ScrollNotification extends Notification {
+  ScrollNotification(this.scrollable, this.position);
+  final ScrollableState scrollable;
+  final double position;
+}
+
 Future ensureWidgetIsVisible(BuildContext context, { Duration duration, Curve curve }) {
   assert(context.findRenderObject() is RenderBox);
   // TODO(abarth): This function doesn't handle nested scrollable widgets.

packages/flutter/lib/widgets.dart

@@ -25,6 +25,7 @@ export 'src/widgets/mimic.dart';
 export 'src/widgets/mixed_viewport.dart';
 export 'src/widgets/modal_barrier.dart';
 export 'src/widgets/navigator.dart';
+export 'src/widgets/notification_listener.dart';
 export 'src/widgets/overlay.dart';
 export 'src/widgets/page_storage.dart';
 export 'src/widgets/placeholder.dart';

packages/unit/test/animation/scheduler_test.dart

@@ -2,6 +2,10 @@ import 'package:flutter/animation.dart';
 import 'package:test/test.dart';
 
 void main() {
+  test("Check for a time dilation being in effect", () {
+    expect(timeDilation, equals(1.0));
+  });
+
   test("Can cancel queued callback", () {
     int secondId;
 

packages/unit/test/widget/date_picker_test.dart

@@ -11,7 +11,8 @@ void main() {
     testWidgets((WidgetTester tester) {
       DateTime currentValue;
 
-      Widget widget = new Block(<Widget>[
+      Widget widget = new Material(
+        child: new Block(<Widget>[
           new DatePicker(
             selectedDate: new DateTime.utc(2015, 6, 9, 7, 12),
             firstDate: new DateTime.utc(2013),
@@ -20,7 +21,8 @@ void main() {
               currentValue = dateTime;
             }
           )
-      ]);
+        ])
+      );
 
       tester.pumpWidget(widget);
 

packages/unit/test/widget/heroes_test.dart

@@ -11,18 +11,22 @@ import 'test_matchers.dart';
 Key firstKey = new Key('first');
 Key secondKey = new Key('second');
 final Map<String, RouteBuilder> routes = <String, RouteBuilder>{
-  '/': (RouteArguments args) => new Block([
+  '/': (RouteArguments args) => new Material(
+    child: new Block([
       new Container(height: 100.0, width: 100.0),
       new Card(child: new Hero(tag: 'a', child: new Container(height: 100.0, width: 100.0, key: firstKey))),
       new Container(height: 100.0, width: 100.0),
       new FlatButton(child: new Text('button'), onPressed: () => Navigator.pushNamed(args.context, '/two')),
-  ]),
-  '/two': (RouteArguments args) => new Block([
+    ])
+  ),
+  '/two': (RouteArguments args) => new Material(
+    child: new Block([
       new Container(height: 150.0, width: 150.0),
       new Card(child: new Hero(tag: 'a', child: new Container(height: 150.0, width: 150.0, key: secondKey))),
       new Container(height: 150.0, width: 150.0),
       new FlatButton(child: new Text('button'), onPressed: () => Navigator.pop(args.context)),
-  ]),
+    ])
+  ),
 };
 
 void main() {

packages/unit/test/widget/tabs_test.dart

@@ -10,10 +10,12 @@ import 'package:test/test.dart';
 TabBarSelection selection;
 
 Widget buildFrame({ List<String> tabs, bool isScrollable: false }) {
-  return new TabBar(
+  return new Material(
+    child: new TabBar(
       labels: tabs.map((String tab) => new TabLabel(text: tab)).toList(),
       selection: selection,
       isScrollable: isScrollable
+    )
   );
 }