New Gallery UI reprise (#17031)

dev/benchmarks/complex_layout/pubspec.yaml

@@ -11,7 +11,7 @@ dependencies:
   flutter_gallery_assets:
     git:
       url: https://flutter.googlesource.com/gallery-assets
-      ref: d318485f208376e06d7e330d9f191141d14722b8
+      ref: 43590e625ab1b07f6a5809287ce16f7e61d9e165
 
   async: 2.0.6 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   charcode: 1.1.1 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"

examples/flutter_gallery/lib/gallery/about.dart

+// Copyright 2018 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 'package:flutter/gestures.dart';
+import 'package:flutter/foundation.dart' show defaultTargetPlatform;
+import 'package:flutter/material.dart';
+
+import 'package:url_launcher/url_launcher.dart';
+
+class _LinkTextSpan extends TextSpan {
+
+  // Beware!
+  //
+  // This class is only safe because the TapGestureRecognizer is not
+  // given a deadline and therefore never allocates any resources.
+  //
+  // In any other situation -- setting a deadline, using any of the less trivial
+  // recognizers, etc -- you would have to manage the gesture recognizer's
+  // lifetime and call dispose() when the TextSpan was no longer being rendered.
+  //
+  // Since TextSpan itself is @immutable, this means that you would have to
+  // manage the recognizer from outside the TextSpan, e.g. in the State of a
+  // stateful widget that then hands the recognizer to the TextSpan.
+
+  _LinkTextSpan({ TextStyle style, String url, String text }) : super(
+    style: style,
+    text: text ?? url,
+    recognizer: new TapGestureRecognizer()..onTap = () {
+      launch(url, forceSafariVC: false);
+    }
+  );
+}
+
+void showGalleryAboutDialog(BuildContext context) {
+  final ThemeData themeData = Theme.of(context);
+  final TextStyle aboutTextStyle = themeData.textTheme.body2;
+  final TextStyle linkStyle = themeData.textTheme.body2.copyWith(color: themeData.accentColor);
+
+  showAboutDialog(
+    context: context,
+    applicationVersion: 'April 2018 Preview',
+    applicationIcon: const FlutterLogo(),
+    applicationLegalese: '© 2017 The Chromium Authors',
+    children: <Widget>[
+      new Padding(
+        padding: const EdgeInsets.only(top: 24.0),
+        child: new RichText(
+          text: new TextSpan(
+            children: <TextSpan>[
+              new TextSpan(
+                style: aboutTextStyle,
+                text: 'Flutter is an early-stage, open-source project to help developers '
+                      'build high-performance, high-fidelity, mobile apps for '
+                      '${defaultTargetPlatform == TargetPlatform.iOS ? 'multiple platforms' : 'iOS and Android'} '
+                      'from a single codebase. This gallery is a preview of '
+                      "Flutter's many widgets, behaviors, animations, layouts, "
+                      'and more. Learn more about Flutter at '
+              ),
+              new _LinkTextSpan(
+                style: linkStyle,
+                url: 'https://flutter.io',
+              ),
+              new TextSpan(
+                style: aboutTextStyle,
+                text: '.\n\nTo see the source code for this app, please visit the ',
+              ),
+              new _LinkTextSpan(
+                style: linkStyle,
+                url: 'https://goo.gl/iv1p4G',
+                text: 'flutter github repo',
+              ),
+              new TextSpan(
+                style: aboutTextStyle,
+                text: '.',
+              ),
+            ],
+          ),
+        ),
+      ),
+    ],
+  );
+}

examples/flutter_gallery/lib/gallery/app.dart

@@ -8,53 +8,79 @@ import 'package:flutter/foundation.dart' show defaultTargetPlatform;
 import 'package:flutter/material.dart';
 import 'package:flutter/scheduler.dart' show timeDilation;
 
+import 'package:url_launcher/url_launcher.dart';
+
+import 'demos.dart';
 import 'home.dart';
-import 'item.dart';
-import 'theme.dart';
-import 'updates.dart';
+import 'options.dart';
+import 'scales.dart';
+import 'themes.dart';
+import 'updater.dart';
 
 class GalleryApp extends StatefulWidget {
   const GalleryApp({
+    Key key,
     this.updateUrlFetcher,
     this.enablePerformanceOverlay: true,
-    this.checkerboardRasterCacheImages: true,
-    this.checkerboardOffscreenLayers: true,
+    this.enableRasterCacheImagesCheckerboard: true,
+    this.enableOffscreenLayersCheckerboard: true,
     this.onSendFeedback,
-    Key key}
-  ) : super(key: key);
+  }) : super(key: key);
 
   final UpdateUrlFetcher updateUrlFetcher;
-
   final bool enablePerformanceOverlay;
-
-  final bool checkerboardRasterCacheImages;
-
-  final bool checkerboardOffscreenLayers;
-
+  final bool enableRasterCacheImagesCheckerboard;
+  final bool enableOffscreenLayersCheckerboard;
   final VoidCallback onSendFeedback;
 
   @override
-  GalleryAppState createState() => new GalleryAppState();
+  _GalleryAppState createState() => new _GalleryAppState();
 }
 
-class GalleryAppState extends State<GalleryApp> {
-  GalleryTheme _galleryTheme = kAllGalleryThemes[0];
-  bool _showPerformanceOverlay = false;
-  bool _checkerboardRasterCacheImages = false;
-  bool _checkerboardOffscreenLayers = false;
-  TextDirection _overrideDirection = TextDirection.ltr;
-  double _timeDilation = 1.0;
-  TargetPlatform _platform;
-
-  // A null value indicates "use system default".
-  double _textScaleFactor;
-
+class _GalleryAppState extends State<GalleryApp> {
+  GalleryOptions _options;
   Timer _timeDilationTimer;
 
+  Map<String, WidgetBuilder> _buildRoutes() {
+    // For a different example of how to set up an application routing table
+    // using named routes, consider the example in the Navigator class documentation:
+    // https://docs.flutter.io/flutter/widgets/Navigator-class.html
+
+    return new Map<String, WidgetBuilder>.fromIterable(
+      kAllGalleryDemos,
+      key: (dynamic demo) => '${demo.routeName}',
+      value: (dynamic demo) => demo.buildRoute,
+    )..addAll(
+      new Map<String, WidgetBuilder>.fromIterable(
+        kAllGalleryDemoCategories,
+        key: (dynamic category) => '/${category.name}',
+        value: (dynamic category) {
+          return (BuildContext context) {
+            return new DemosPage(
+              category: category,
+              optionsPage: new GalleryOptionsPage(
+                options: _options,
+                onOptionsChanged: _handleOptionsChanged,
+                onSendFeedback: widget.onSendFeedback ?? () {
+                  launch('https://github.com/flutter/flutter/issues/new', forceSafariVC: false);
+                },
+              ),
+            );
+          };
+        },
+      ),
+    );
+  }
+
   @override
   void initState() {
-    _timeDilation = timeDilation;
     super.initState();
+    _options = new GalleryOptions(
+      theme: kLightGalleryTheme,
+      textScaleFactor: kAllGalleryTextScaleValues[0],
+      timeDilation: timeDilation,
+      platform: defaultTargetPlatform,
+    );
   }
 
   @override
@@ -64,80 +90,50 @@ class GalleryAppState extends State<GalleryApp> {
     super.dispose();
   }
 
-  Widget _applyScaleFactor(Widget child) {
+  void _handleOptionsChanged(GalleryOptions newOptions) {
+    setState(() {
+      if (_options.timeDilation != newOptions.timeDilation) {
+        _timeDilationTimer?.cancel();
+        _timeDilationTimer = null;
+        if (newOptions.timeDilation > 1.0) {
+          // We delay the time dilation change long enough that the user can see
+          // that UI has started reacting and then we slam on the brakes so that
+          // they see that the time is in fact now dilated.
+          _timeDilationTimer = new Timer(const Duration(milliseconds: 150), () {
+            timeDilation = newOptions.timeDilation;
+          });
+        } else {
+          timeDilation = newOptions.timeDilation;
+        }
+      }
+
+      _options = newOptions;
+    });
+  }
+
+  Widget _applyTextScaleFactor(Widget child) {
     return new Builder(
-      builder: (BuildContext context) => new MediaQuery(
-        data: MediaQuery.of(context).copyWith(
-          textScaleFactor: _textScaleFactor,
-        ),
-        child: child,
-      ),
+      builder: (BuildContext context) {
+        return new MediaQuery(
+          data: MediaQuery.of(context).copyWith(
+            textScaleFactor: _options.textScaleFactor.scale,
+          ),
+          child: child,
+        );
+      },
     );
   }
 
   @override
   Widget build(BuildContext context) {
     Widget home = new GalleryHome(
-      galleryTheme: _galleryTheme,
-      onThemeChanged: (GalleryTheme value) {
-        setState(() {
-          _galleryTheme = value;
-        });
-      },
-      showPerformanceOverlay: _showPerformanceOverlay,
-      onShowPerformanceOverlayChanged: widget.enablePerformanceOverlay ? (bool value) {
-        setState(() {
-          _showPerformanceOverlay = value;
-        });
-      } : null,
-      checkerboardRasterCacheImages: _checkerboardRasterCacheImages,
-      onCheckerboardRasterCacheImagesChanged: widget.checkerboardRasterCacheImages ? (bool value) {
-        setState(() {
-          _checkerboardRasterCacheImages = value;
-        });
-      } : null,
-      checkerboardOffscreenLayers: _checkerboardOffscreenLayers,
-      onCheckerboardOffscreenLayersChanged: widget.checkerboardOffscreenLayers ? (bool value) {
-        setState(() {
-          _checkerboardOffscreenLayers = value;
-        });
-      } : null,
-      onPlatformChanged: (TargetPlatform value) {
-        setState(() {
-          _platform = value == defaultTargetPlatform ? null : value;
-        });
-      },
-      timeDilation: _timeDilation,
-      onTimeDilationChanged: (double value) {
-        setState(() {
-          _timeDilationTimer?.cancel();
-          _timeDilationTimer = null;
-          _timeDilation = value;
-          if (_timeDilation > 1.0) {
-            // We delay the time dilation change long enough that the user can see
-            // that the checkbox in the drawer has started reacting, then we slam
-            // on the brakes so that they see that the time is in fact now dilated.
-            _timeDilationTimer = new Timer(const Duration(milliseconds: 150), () {
-              timeDilation = _timeDilation;
-            });
-          } else {
-            timeDilation = _timeDilation;
-          }
-        });
-      },
-      textScaleFactor: _textScaleFactor,
-      onTextScaleFactorChanged: (double value) {
-        setState(() {
-          _textScaleFactor = value;
-         });
-      },
-      overrideDirection: _overrideDirection,
-      onOverrideDirectionChanged: (TextDirection value) {
-        setState(() {
-          _overrideDirection = value;
-        });
-      },
-      onSendFeedback: widget.onSendFeedback,
+      optionsPage: new GalleryOptionsPage(
+        options: _options,
+        onOptionsChanged: _handleOptionsChanged,
+        onSendFeedback: widget.onSendFeedback ?? () {
+          launch('https://github.com/flutter/flutter/issues/new');
+        },
+      ),
     );
 
     if (widget.updateUrlFetcher != null) {
@@ -147,31 +143,21 @@ class GalleryAppState extends State<GalleryApp> {
       );
     }
 
-    final Map<String, WidgetBuilder> _kRoutes = <String, WidgetBuilder>{};
-    for (GalleryItem item in kAllGalleryItems) {
-      // For a different example of how to set up an application routing table
-      // using named routes, consider the example in the Navigator class documentation:
-      // https://docs.flutter.io/flutter/widgets/Navigator-class.html
-      _kRoutes[item.routeName] = (BuildContext context) {
-        return item.buildRoute(context);
-      };
-    }
-
     return new MaterialApp(
+      theme: _options.theme.data.copyWith(platform: _options.platform),
       title: 'Flutter Gallery',
       color: Colors.grey,
-      theme: _galleryTheme.theme.copyWith(platform: _platform ?? defaultTargetPlatform),
-      showPerformanceOverlay: _showPerformanceOverlay,
-      checkerboardRasterCacheImages: _checkerboardRasterCacheImages,
-      checkerboardOffscreenLayers: _checkerboardOffscreenLayers,
-      routes: _kRoutes,
-      home: home,
+      showPerformanceOverlay: _options.showPerformanceOverlay,
+      checkerboardOffscreenLayers: _options.showOffscreenLayersCheckerboard,
+      checkerboardRasterCacheImages: _options.showRasterCacheImagesCheckerboard,
+      routes: _buildRoutes(),
       builder: (BuildContext context, Widget child) {
         return new Directionality(
-          textDirection: _overrideDirection,
-          child: _applyScaleFactor(child),
+          textDirection: _options.textDirection,
+          child: _applyTextScaleFactor(child),
         );
       },
+      home: home,
     );
   }
 }

examples/flutter_gallery/lib/gallery/backdrop.dart

+// Copyright 2018 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 'dart:math' as math;
+
+import 'package:flutter/foundation.dart';
+import 'package:flutter/rendering.dart';
+import 'package:flutter/material.dart';
+
+const double _kFrontHeadingHeight = 32.0; // front layer beveled rectangle
+const double _kFrontClosedHeight = 72.0; // front layer height when closed
+const double _kBackAppBarHeight = 56.0; // back layer (options) appbar height
+
+// The size of the front layer heading's left and right beveled corners.
+final Tween<BorderRadius> _kFrontHeadingBevelRadius = new BorderRadiusTween(
+  begin: const BorderRadius.only(
+    topLeft: const Radius.circular(12.0),
+    topRight: const Radius.circular(12.0),
+  ),
+  end: const BorderRadius.only(
+    topLeft: const Radius.circular(_kFrontHeadingHeight),
+    topRight: const Radius.circular(_kFrontHeadingHeight),
+  ),
+);
+
+class _IgnorePointerWhileStatusIsNot extends StatefulWidget {
+  const _IgnorePointerWhileStatusIsNot(this.status, {
+    Key key,
+    this.controller,
+    this.child,
+  }) : super(key: key);
+
+  final AnimationController controller;
+  final AnimationStatus status;
+  final Widget child;
+
+  @override
+  _IgnorePointerWhileStatusIsNotState createState() => new _IgnorePointerWhileStatusIsNotState();
+}
+
+class _IgnorePointerWhileStatusIsNotState extends State<_IgnorePointerWhileStatusIsNot> {
+  bool _ignoring;
+
+  @override
+  void initState() {
+    super.initState();
+    widget.controller.addStatusListener(_handleStatusChange);
+    _ignoring = widget.controller.status != AnimationStatus.completed;
+  }
+
+  @override
+  void dispose() {
+    widget.controller.removeStatusListener(_handleStatusChange);
+    super.dispose();
+  }
+
+  void _handleStatusChange(AnimationStatus _) {
+    final bool value = widget.controller.status != widget.status;
+    if (_ignoring != value) {
+      setState(() {
+        _ignoring = value;
+      });
+    }
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return new IgnorePointer(
+      ignoring: _ignoring,
+      child: widget.child,
+    );
+  }
+}
+
+class _CrossFadeTransition extends AnimatedWidget {
+  const _CrossFadeTransition({
+    Key key,
+    this.alignment: Alignment.center,
+    Animation<double> progress,
+    this.child0,
+    this.child1,
+  }) : super(key: key, listenable: progress);
+
+  final AlignmentGeometry alignment;
+  final Widget child0;
+  final Widget child1;
+
+  @override
+  Widget build(BuildContext context) {
+    final Animation<double> progress = listenable;
+
+    final double opacity1 = new CurvedAnimation(
+      parent: new ReverseAnimation(progress),
+      curve: const Interval(0.5, 1.0),
+    ).value;
+
+    final double opacity2 = new CurvedAnimation(
+      parent: progress,
+      curve: const Interval(0.5, 1.0),
+    ).value;
+
+    return new Stack(
+      alignment: alignment,
+      children: <Widget>[
+        new IgnorePointer(
+          ignoring: opacity1 < 1.0,
+          child: new Opacity(
+            opacity: opacity1,
+            child: child1,
+          ),
+        ),
+        new IgnorePointer(
+          ignoring: opacity2 <1.0,
+          child: new Opacity(
+            opacity: opacity2,
+            child: child0,
+          ),
+        ),
+      ],
+    );
+  }
+}
+
+class _BackAppBar extends StatelessWidget {
+  const _BackAppBar({
+    Key key,
+    this.leading: const SizedBox(width: 56.0),
+    @required this.title,
+    this.trailing,
+  }) : assert(leading != null), assert(title != null), super(key: key);
+
+  final Widget leading;
+  final Widget title;
+  final Widget trailing;
+
+  @override
+  Widget build(BuildContext context) {
+    final List<Widget> children = <Widget>[
+      new Container(
+        alignment: Alignment.center,
+        width: 56.0,
+        child: leading,
+      ),
+      new Expanded(
+        child: title,
+      ),
+    ];
+
+    if (trailing != null) {
+      children.add(
+        new Container(
+          alignment: Alignment.center,
+          width: 56.0,
+          child: trailing,
+        ),
+      );
+    }
+
+    final ThemeData theme = Theme.of(context);
+
+    return IconTheme.merge(
+      data: theme.primaryIconTheme,
+      child: new DefaultTextStyle(
+        style: theme.primaryTextTheme.title,
+        child: new SizedBox(
+          height: _kBackAppBarHeight,
+          child: new Row(children: children),
+        ),
+      ),
+    );
+  }
+}
+
+class Backdrop extends StatefulWidget {
+  const Backdrop({
+    this.frontAction,
+    this.frontTitle,
+    this.frontHeading,
+    this.frontLayer,
+    this.backTitle,
+    this.backLayer,
+  });
+
+  final Widget frontAction;
+  final Widget frontTitle;
+  final Widget frontLayer;
+  final Widget frontHeading;
+  final Widget backTitle;
+  final Widget backLayer;
+
+  @override
+  _BackdropState createState() => new _BackdropState();
+}
+
+class _BackdropState extends State<Backdrop> with SingleTickerProviderStateMixin {
+  final GlobalKey _backdropKey = new GlobalKey(debugLabel: 'Backdrop');
+  AnimationController _controller;
+
+  @override
+  void initState() {
+    super.initState();
+    _controller = new AnimationController(
+      duration: const Duration(milliseconds: 300),
+      value: 1.0,
+      vsync: this,
+    );
+  }
+
+  @override
+  void dispose() {
+    _controller.dispose();
+    super.dispose();
+  }
+
+  double get _backdropHeight {
+    // Warning: this can be safely called from the event handlers but it may
+    // not be called at build time.
+    final RenderBox renderBox = _backdropKey.currentContext.findRenderObject();
+    return math.max(0.0, renderBox.size.height - _kBackAppBarHeight - _kFrontClosedHeight);
+  }
+
+  void _handleDragUpdate(DragUpdateDetails details) {
+    _controller.value -= details.primaryDelta / (_backdropHeight ?? details.primaryDelta);
+  }
+
+  void _handleDragEnd(DragEndDetails details) {
+    if (_controller.isAnimating || _controller.status == AnimationStatus.completed)
+      return;
+
+    final double flingVelocity = details.velocity.pixelsPerSecond.dy / _backdropHeight;
+    if (flingVelocity < 0.0)
+      _controller.fling(velocity: math.max(2.0, -flingVelocity));
+    else if (flingVelocity > 0.0)
+      _controller.fling(velocity: math.min(-2.0, -flingVelocity));
+    else
+      _controller.fling(velocity: _controller.value < 0.5 ? -2.0 : 2.0);
+  }
+
+  void _toggleFrontLayer() {
+    final AnimationStatus status = _controller.status;
+    final bool isOpen = status == AnimationStatus.completed || status == AnimationStatus.forward;
+    _controller.fling(velocity: isOpen ? -2.0 : 2.0);
+  }
+
+  Widget _buildStack(BuildContext context, BoxConstraints constraints) {
+    final Animation<RelativeRect> frontRelativeRect = new RelativeRectTween(
+      begin: new RelativeRect.fromLTRB(0.0, constraints.biggest.height - _kFrontClosedHeight, 0.0, 0.0),
+      end: const RelativeRect.fromLTRB(0.0, _kBackAppBarHeight, 0.0, 0.0),
+    ).animate(_controller);
+
+    return new Stack(
+      key: _backdropKey,
+      children: <Widget>[
+        new Column(
+          crossAxisAlignment: CrossAxisAlignment.stretch,
+          children: <Widget>[
+            // Back layer
+            new _BackAppBar(
+              leading: widget.frontAction,
+              title: new _CrossFadeTransition(
+                progress: _controller,
+                alignment: AlignmentDirectional.centerStart,
+                child0: widget.frontTitle,
+                child1: widget.backTitle,
+              ),
+              trailing: new IconButton(
+                onPressed: _toggleFrontLayer,
+                tooltip: 'Show options page',
+                icon: new AnimatedIcon(
+                  icon: AnimatedIcons.close_menu,
+                  progress: _controller,
+                ),
+              ),
+            ),
+            new Expanded(
+              child: new _IgnorePointerWhileStatusIsNot(
+                AnimationStatus.dismissed,
+                controller: _controller,
+                child: widget.backLayer,
+              ),
+            ),
+          ],
+        ),
+        // Front layer
+        new PositionedTransition(
+          rect: frontRelativeRect,
+          child: new AnimatedBuilder(
+            animation: _controller,
+            builder: (BuildContext context, Widget child) {
+              return new PhysicalShape(
+                elevation: 12.0,
+                color: Theme.of(context).canvasColor,
+                clipper: new ShapeBorderClipper(
+                  shape: new BeveledRectangleBorder(
+                    borderRadius: _kFrontHeadingBevelRadius.lerp(_controller.value),
+                  ),
+                ),
+                child: child,
+              );
+            },
+            child: new _IgnorePointerWhileStatusIsNot(
+              AnimationStatus.completed,
+              controller: _controller,
+              child: widget.frontLayer,
+            ),
+          ),
+        ),
+        new PositionedTransition(
+          rect: frontRelativeRect,
+          child: new Container(
+            alignment: Alignment.topLeft,
+            child: new GestureDetector(
+              behavior: HitTestBehavior.opaque,
+              onTap: _toggleFrontLayer,
+              onVerticalDragUpdate: _handleDragUpdate,
+              onVerticalDragEnd: _handleDragEnd,
+              child: widget.frontHeading,
+            ),
+          ),
+        ),
+      ],
+    );
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return new LayoutBuilder(builder: _buildStack);
+  }
+}

examples/flutter_gallery/lib/gallery/icons.dart

+// Copyright 2018 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 'package:flutter/material.dart';
+
+class GalleryIcons {
+  GalleryIcons._();
+
+  static const IconData tooltip = const IconData(0xe900, fontFamily: 'GalleryIcons');
+  static const IconData text_fields_alt = const IconData(0xe901, fontFamily: 'GalleryIcons');
+  static const IconData tabs = const IconData(0xe902, fontFamily: 'GalleryIcons');
+  static const IconData switches = const IconData(0xe903, fontFamily: 'GalleryIcons');
+  static const IconData sliders = const IconData(0xe904, fontFamily: 'GalleryIcons');
+  static const IconData shrine = const IconData(0xe905, fontFamily: 'GalleryIcons');
+  static const IconData sentiment_very_satisfied = const IconData(0xe906, fontFamily: 'GalleryIcons');
+  static const IconData refresh = const IconData(0xe907, fontFamily: 'GalleryIcons');
+  static const IconData progress_activity = const IconData(0xe908, fontFamily: 'GalleryIcons');
+  static const IconData phone_iphone = const IconData(0xe909, fontFamily: 'GalleryIcons');
+  static const IconData page_control = const IconData(0xe90a, fontFamily: 'GalleryIcons');
+  static const IconData more_vert = const IconData(0xe90b, fontFamily: 'GalleryIcons');
+  static const IconData menu = const IconData(0xe90c, fontFamily: 'GalleryIcons');
+  static const IconData list_alt = const IconData(0xe90d, fontFamily: 'GalleryIcons');
+  static const IconData grid_on = const IconData(0xe90e, fontFamily: 'GalleryIcons');
+  static const IconData expand_all = const IconData(0xe90f, fontFamily: 'GalleryIcons');
+  static const IconData event = const IconData(0xe910, fontFamily: 'GalleryIcons');
+  static const IconData drive_video = const IconData(0xe911, fontFamily: 'GalleryIcons');
+  static const IconData dialogs = const IconData(0xe912, fontFamily: 'GalleryIcons');
+  static const IconData data_table = const IconData(0xe913, fontFamily: 'GalleryIcons');
+  static const IconData custom_typography = const IconData(0xe914, fontFamily: 'GalleryIcons');
+  static const IconData colors = const IconData(0xe915, fontFamily: 'GalleryIcons');
+  static const IconData chips = const IconData(0xe916, fontFamily: 'GalleryIcons');
+  static const IconData check_box = const IconData(0xe917, fontFamily: 'GalleryIcons');
+  static const IconData cards = const IconData(0xe918, fontFamily: 'GalleryIcons');
+  static const IconData buttons = const IconData(0xe919, fontFamily: 'GalleryIcons');
+  static const IconData bottom_sheets = const IconData(0xe91a, fontFamily: 'GalleryIcons');
+  static const IconData bottom_navigation = const IconData(0xe91b, fontFamily: 'GalleryIcons');
+  static const IconData animation = const IconData(0xe91c, fontFamily: 'GalleryIcons');
+  static const IconData account_box = const IconData(0xe91d, fontFamily: 'GalleryIcons');
+  static const IconData snackbar = const IconData(0xe91e, fontFamily: 'GalleryIcons');
+  static const IconData category_mdc = const IconData(0xe91f, fontFamily: 'GalleryIcons');
+  static const IconData cupertino_progress = const IconData(0xe920, fontFamily: 'GalleryIcons');
+  static const IconData cupertino_pull_to_refresh = const IconData(0xe921, fontFamily: 'GalleryIcons');
+  static const IconData cupertino_switch = const IconData(0xe922, fontFamily: 'GalleryIcons');
+  static const IconData generic_buttons = const IconData(0xe923, fontFamily: 'GalleryIcons');
+  static const IconData backdrop = const IconData(0xe924, fontFamily: 'GalleryIcons');
+  static const IconData bottom_app_bar = const IconData(0xe925, fontFamily: 'GalleryIcons');
+  static const IconData bottom_sheet_persistent = const IconData(0xe926, fontFamily: 'GalleryIcons');
+  static const IconData lists_leave_behind = const IconData(0xe927, fontFamily: 'GalleryIcons');
+}

examples/flutter_gallery/lib/gallery/scales.dart

+// Copyright 2018 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 'package:flutter/material.dart';
+
+class GalleryTextScaleValue {
+  const GalleryTextScaleValue(this.scale, this.label);
+
+  final double scale;
+  final String label;
+
+  @override
+  bool operator ==(dynamic other) {
+    if (runtimeType != other.runtimeType)
+      return false;
+    final GalleryTextScaleValue typedOther = other;
+    return scale == typedOther.scale && label == typedOther.label;
+  }
+
+  @override
+  int get hashCode => hashValues(scale, label);
+
+  @override
+  String toString() {
+    return '$runtimeType($label)';
+  }
+
+}
+
+const List<GalleryTextScaleValue> kAllGalleryTextScaleValues = const <GalleryTextScaleValue>[
+  const GalleryTextScaleValue(null, 'System Default'),
+  const GalleryTextScaleValue(0.8, 'Small'),
+  const GalleryTextScaleValue(1.0, 'Normal'),
+  const GalleryTextScaleValue(1.3, 'Large'),
+  const GalleryTextScaleValue(2.0, 'Huge'),
+];

examples/flutter_gallery/lib/gallery/theme.dart

-// Copyright 2018 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 'package:flutter/material.dart';
-
-class GalleryTheme {
-  const GalleryTheme({ this.name, this.icon, this.theme });
-  final String name;
-  final IconData icon;
-  final ThemeData theme;
-}
-
-const int _kPurplePrimaryValue = 0xFF6200EE;
-const MaterialColor _kPurpleSwatch = const MaterialColor(
-  _kPurplePrimaryValue,
-  const <int, Color> {
-    50: const Color(0xFFF2E7FE),
-    100: const Color(0xFFD7B7FD),
-    200: const Color(0xFFBB86FC),
-    300: const Color(0xFF9E55FC),
-    400: const Color(0xFF7F22FD),
-    500: const Color(_kPurplePrimaryValue),
-    700: const Color(0xFF3700B3),
-    800: const Color(0xFF270096),
-    900: const Color(0xFF190078),
-  }
-);
-
-final List<GalleryTheme> kAllGalleryThemes = <GalleryTheme>[
-  new GalleryTheme(
-    name: 'Light',
-    icon: Icons.brightness_5,
-    theme: new ThemeData(
-      brightness: Brightness.light,
-      primarySwatch: Colors.blue,
-    ),
-  ),
-  new GalleryTheme(
-    name: 'Dark',
-    icon: Icons.brightness_7,
-    theme: new ThemeData(
-      brightness: Brightness.dark,
-      primarySwatch: Colors.blue,
-    ),
-  ),
-  new GalleryTheme(
-    name: 'Purple',
-    icon: Icons.brightness_6,
-    theme: new ThemeData(
-      brightness: Brightness.light,
-      primarySwatch: _kPurpleSwatch,
-      buttonColor: _kPurpleSwatch[500],
-      splashColor: Colors.white24,
-      splashFactory: InkRipple.splashFactory,
-      errorColor: const Color(0xFFFF1744),
-      buttonTheme: const ButtonThemeData(
-        textTheme: ButtonTextTheme.primary,
-      ),
-    ),
-  ),
-];

examples/flutter_gallery/lib/gallery/themes.dart

+// Copyright 2018 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 'package:flutter/material.dart';
+
+class GalleryTheme {
+  const GalleryTheme._(this.name, this.data);
+
+  final String name;
+  final ThemeData data;
+}
+
+final GalleryTheme kDarkGalleryTheme = new GalleryTheme._('Dark', _buildDarkTheme());
+final GalleryTheme kLightGalleryTheme = new GalleryTheme._('Light', _buildLightTheme());
+
+TextTheme _buildTextTheme(TextTheme base) {
+  return base.copyWith(
+    title: base.title.copyWith(
+      fontFamily: 'GoogleSans',
+    ),
+  );
+}
+
+ThemeData _buildDarkTheme() {
+  const Color primaryColor = const Color(0xFF0175c2);
+  final ThemeData base = new ThemeData.dark();
+  return base.copyWith(
+    primaryColor: primaryColor,
+    buttonColor: primaryColor,
+    indicatorColor: Colors.white,
+    accentColor: const Color(0xFF13B9FD),
+    canvasColor: const Color(0xFF202124),
+    scaffoldBackgroundColor: const Color(0xFF202124),
+    backgroundColor: const Color(0xFF202124),
+    buttonTheme: const ButtonThemeData(
+      textTheme: ButtonTextTheme.primary,
+    ),
+    textTheme: _buildTextTheme(base.textTheme),
+    primaryTextTheme: _buildTextTheme(base.primaryTextTheme),
+    accentTextTheme: _buildTextTheme(base.accentTextTheme),
+  );
+}
+
+ThemeData _buildLightTheme() {
+  const Color primaryColor = const Color(0xFF0175c2);
+  final ThemeData base = new ThemeData.light();
+  return base.copyWith(
+    primaryColor: primaryColor,
+    buttonColor: primaryColor,
+    indicatorColor: Colors.white,
+    splashColor: Colors.white24,
+    splashFactory: InkRipple.splashFactory,
+    accentColor: const Color(0xFF13B9FD),
+    canvasColor: Colors.white,
+    scaffoldBackgroundColor: Colors.white,
+    backgroundColor: Colors.white,
+    buttonTheme: const ButtonThemeData(
+      textTheme: ButtonTextTheme.primary,
+    ),
+    textTheme: _buildTextTheme(base.textTheme),
+    primaryTextTheme: _buildTextTheme(base.primaryTextTheme),
+    accentTextTheme: _buildTextTheme(base.accentTextTheme),
+  );
+}

examples/flutter_gallery/pubspec.yaml

@@ -15,7 +15,7 @@ dependencies:
   flutter_gallery_assets:
     git:
       url: https://flutter.googlesource.com/gallery-assets
-      ref: d318485f208376e06d7e330d9f191141d14722b8
+      ref: 43590e625ab1b07f6a5809287ce16f7e61d9e165
 
   charcode: 1.1.1 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
   meta: 1.1.2 # THIS LINE IS AUTOGENERATED - TO UPDATE USE "flutter update-packages --force-upgrade"
@@ -79,6 +79,11 @@ flutter:
   uses-material-design: true
   assets:
     - lib/gallery/example_code.dart
+    - packages/flutter_gallery_assets/white_logo/logo.png
+    - packages/flutter_gallery_assets/white_logo/1.5x/logo.png
+    - packages/flutter_gallery_assets/white_logo/2.5x/logo.png
+    - packages/flutter_gallery_assets/white_logo/3.0x/logo.png
+    - packages/flutter_gallery_assets/white_logo/4.0x/logo.png
     - packages/flutter_gallery_assets/videos/butterfly.mp4
     - packages/flutter_gallery_assets/animated_flutter_lgtm.gif
     - packages/flutter_gallery_assets/animated_flutter_stickers.webp
@@ -166,5 +171,42 @@ flutter:
     - family: AbrilFatface
       fonts:
         - asset: packages/flutter_gallery_assets/shrine/fonts/abrilfatface/AbrilFatface-Regular.ttf
+    - family: GalleryIcons
+      fonts:
+        - asset: packages/flutter_gallery_assets/fonts/GalleryIcons.ttf
+    - family: GoogleSans
+      fonts:
+        - asset: packages/flutter_gallery_assets/fonts/GoogleSans-BoldItalic.ttf
+          weight: 700
+          style: italic
+        - asset: packages/flutter_gallery_assets/fonts/GoogleSans-Bold.ttf
+          weight: 700
+        - asset: packages/flutter_gallery_assets/fonts/GoogleSans-Italic.ttf
+          weight: 400
+          style: italic
+        - asset: packages/flutter_gallery_assets/fonts/GoogleSans-MediumItalic.ttf
+          weight: 500
+          style: italic
+        - asset: packages/flutter_gallery_assets/fonts/GoogleSans-Medium.ttf
+          weight: 500
+        - asset: packages/flutter_gallery_assets/fonts/GoogleSans-Regular.ttf
+          weight: 400
+    - family: GoogleSansDisplay
+      fonts:
+        - asset: packages/flutter_gallery_assets/fonts/GoogleSansDisplay-BoldItalic.ttf
+          weight: 700
+          style: italic
+        - asset: packages/flutter_gallery_assets/fonts/GoogleSansDisplay-Bold.ttf
+          weight: 700
+        - asset: packages/flutter_gallery_assets/fonts/GoogleSansDisplay-Italic.ttf
+          weight: 400
+          style: italic
+        - asset: packages/flutter_gallery_assets/fonts/GoogleSansDisplay-MediumItalic.ttf
+          style: italic
+          weight: 500
+        - asset: packages/flutter_gallery_assets/fonts/GoogleSansDisplay-Medium.ttf
+          weight: 500
+        - asset: packages/flutter_gallery_assets/fonts/GoogleSansDisplay-Regular.ttf
+          weight: 400
 
 # PUBSPEC CHECKSUM: 50c7

examples/flutter_gallery/test/drawer_test.dart

@@ -14,87 +14,82 @@ void main() {
 
   testWidgets('Flutter Gallery drawer item test', (WidgetTester tester) async {
     bool hasFeedback = false;
-    void mockOnSendFeedback() {
-      hasFeedback = true;
-    }
 
-    await tester.pumpWidget(new GalleryApp(onSendFeedback: mockOnSendFeedback));
+    await tester.pumpWidget(
+      new GalleryApp(
+        onSendFeedback: () {
+          hasFeedback = true;
+        },
+      ),
+    );
     await tester.pump(); // see https://github.com/flutter/flutter/issues/1865
     await tester.pump(); // triggers a frame
 
-    final Finder finder = find.byWidgetPredicate((Widget widget) {
-      return widget is Tooltip && widget.message == 'Open navigation menu';
-    });
-    expect(finder, findsOneWidget);
-
-    // Open drawer
-    await tester.tap(finder);
-    await tester.pump(); // start animation
-    await tester.pump(const Duration(seconds: 1)); // end animation
+    // Show the options page
+    await tester.tap(find.byTooltip('Show options page'));
+    await tester.pumpAndSettle();
 
     MaterialApp app = find.byType(MaterialApp).evaluate().first.widget;
     expect(app.theme.brightness, equals(Brightness.light));
 
-    // Change theme
-    await tester.tap(find.text('Dark'));
-    await tester.pump(); // start animation
-    await tester.pump(const Duration(seconds: 1)); // end animation
+    // Switch to the dark theme: first switch control
+    await tester.tap(find.byType(Switch).first);
+    await tester.pumpAndSettle();
     app = find.byType(MaterialApp).evaluate().first.widget;
     expect(app.theme.brightness, equals(Brightness.dark));
     expect(app.theme.platform, equals(TargetPlatform.android));
 
-    // Change platform
-    await tester.tap(find.text('iOS'));
-    await tester.pump(); // start animation
-    await tester.pump(const Duration(seconds: 1)); // end animation
+    // Popup the platform menu: second menu button, choose 'Cupertino'
+    await tester.tap(find.byIcon(Icons.arrow_drop_down).at(1));
+    await tester.pumpAndSettle();
+    await tester.tap(find.text('Cupertino').at(1));
+    await tester.pumpAndSettle();
     app = find.byType(MaterialApp).evaluate().first.widget;
     expect(app.theme.platform, equals(TargetPlatform.iOS));
 
     // Verify the font scale.
-    final Size origTextSize = tester.getSize(find.text('Small'));
-    expect(origTextSize, equals(const Size(176.0, 14.0)));
+    final Size origTextSize = tester.getSize(find.text('Text size'));
+    expect(origTextSize, equals(const Size(144.0, 16.0)));
 
-    // Switch font scale.
+    // Popup the text size menu: first menu button, choose 'Small'
+    await tester.tap(find.byIcon(Icons.arrow_drop_down).first);
+    await tester.pumpAndSettle();
     await tester.tap(find.text('Small'));
-    await tester.pump();
-    await tester.pump(const Duration(seconds: 1)); // Wait until it's changed.
-    final Size textSize = tester.getSize(find.text('Small'));
-    expect(textSize, equals(const Size(176.0, 11.0)));
+    await tester.pumpAndSettle();
+    Size textSize = tester.getSize(find.text('Text size'));
+    expect(textSize, equals(const Size(116.0, 13.0)));
 
-    // Set font scale back to default.
+    // Set font scale back to the default.
+    await tester.tap(find.byIcon(Icons.arrow_drop_down).first);
+    await tester.pumpAndSettle();
     await tester.tap(find.text('System Default'));
-    await tester.pump();
-    await tester.pump(const Duration(seconds: 1)); // Wait until it's changed.
-    final Size newTextSize = tester.getSize(find.text('Small'));
-    expect(newTextSize, equals(origTextSize));
-
-    // Scroll to the bottom of the menu.
-    await tester.drag(find.text('Small'), const Offset(0.0, -1000.0));
-    await tester.pump();
-    await tester.pump(const Duration(seconds: 1)); // Wait until it's changed.
-
-    // Test slow animations.
-    expect(timeDilation, equals(1.0));
-    await tester.tap(find.text('Animate Slowly'));
-    await tester.pump();
-    await tester.pump(const Duration(seconds: 1)); // Wait until it's changed.
+    await tester.pumpAndSettle();
+    textSize = tester.getSize(find.text('Text size'));
+    expect(textSize, origTextSize);
+
+    // Switch to slow animation: third switch control
+    expect(timeDilation, 1.0);
+    await tester.tap(find.byType(Switch).at(2));
+    await tester.pumpAndSettle();
     expect(timeDilation, greaterThan(1.0));
 
-    // Put back time dilation (so as not to throw off tests after this one).
-    await tester.tap(find.text('Animate Slowly'));
-    await tester.pump();
-    await tester.pump(const Duration(seconds: 1)); // Wait until it's changed.
-    expect(timeDilation, equals(1.0));
+    // Restore normal animation: third switch control
+    await tester.tap(find.byType(Switch).at(2));
+    await tester.pumpAndSettle();
+    expect(timeDilation, 1.0);
 
     // Send feedback.
     expect(hasFeedback, false);
+
+    // Scroll to the end
+    await tester.drag(find.text('Text size'), const Offset(0.0, -1000.0));
+    await tester.pumpAndSettle();
     await tester.tap(find.text('Send feedback'));
-    await tester.pump();
+    await tester.pumpAndSettle();
     expect(hasFeedback, true);
 
-    // Close drawer
-    await tester.tap(find.byType(DrawerController));
-    await tester.pump(); // start animation
-    await tester.pump(const Duration(seconds: 1)); // end animation
+    // Hide the options page
+    await tester.tap(find.byTooltip('Show options page'));
+    await tester.pumpAndSettle();
   });
 }

examples/flutter_gallery/test/example_code_display_test.dart

@@ -18,25 +18,16 @@ void main() {
     await tester.pump(); // see https://github.com/flutter/flutter/issues/1865
     await tester.pump(); // triggers a frame
 
-
-    // Scroll the Buttons demo into view so that a tap will succeed
-    final Offset allDemosOrigin = tester.getTopRight(find.text('Vignettes'));
-    final Finder button = find.text('Buttons');
-    while (button.evaluate().isEmpty) {
-      await tester.dragFrom(allDemosOrigin, const Offset(0.0, -200.0));
-      await tester.pumpAndSettle();
-    }
+    Scrollable.ensureVisible(tester.element(find.text('Material')), alignment: 0.5);
+    await tester.pumpAndSettle();
+    await tester.tap(find.text('Material'));
+    await tester.pumpAndSettle();
 
     // Launch the buttons demo and then prove that showing the example
     // code dialog does not crash.
 
     await tester.tap(find.text('Buttons'));
-    await tester.pump(); // start animation
-    await tester.pump(const Duration(seconds: 1)); // end animation
-
-    await tester.tap(find.text('RAISED'));
-    await tester.pump(); // start animation
-    await tester.pump(const Duration(seconds: 1)); // end animation
+    await tester.pumpAndSettle();
 
     await tester.tap(find.byTooltip('Show example code'));
     await tester.pump(); // start animation

examples/flutter_gallery/test/live_smoketest.dart

@@ -10,18 +10,15 @@ import 'package:flutter/material.dart';
 import 'package:flutter/scheduler.dart';
 import 'package:flutter_test/flutter_test.dart';
 
-import 'package:flutter_gallery/gallery/app.dart';
-import 'package:flutter_gallery/gallery/item.dart';
+import 'package:flutter_gallery/gallery/demos.dart';
+import 'package:flutter_gallery/gallery/app.dart' show GalleryApp;
 
 // Reports success or failure to the native code.
 const MethodChannel _kTestChannel = const MethodChannel('io.flutter.demo.gallery/TestLifecycleListener');
 
-// The titles for all of the Gallery demos.
-final List<String> _kAllDemos = kAllGalleryItems.map((GalleryItem item) => item.title).toList();
-
 // We don't want to wait for animations to complete before tapping the
 // back button in the demos with these titles.
-const List<String> _kUnsynchronizedDemos = const <String>[
+const List<String> _kUnsynchronizedDemoTitles = const <String>[
   'Progress indicators',
   'Activity Indicator',
   'Video',
@@ -29,38 +26,45 @@ const List<String> _kUnsynchronizedDemos = const <String>[
 
 // These demos can't be backed out of by tapping a button whose
 // tooltip is 'Back'.
-const List<String> _kSkippedDemos = const <String>[
+const List<String> _kSkippedDemoTitles = const <String>[
   'Pull to refresh',
+  'Progress indicators',
+  'Activity Indicator',
+  'Video',
 ];
 
 Future<Null> main() async {
   try {
     // Verify that _kUnsynchronizedDemos and _kSkippedDemos identify
     // demos that actually exist.
-    if (!new Set<String>.from(_kAllDemos).containsAll(_kUnsynchronizedDemos))
-      fail('Unrecognized demo names in _kUnsynchronizedDemos: $_kUnsynchronizedDemos');
-    if (!new Set<String>.from(_kAllDemos).containsAll(_kSkippedDemos))
-      fail('Unrecognized demo names in _kSkippedDemos: $_kSkippedDemos');
+    final List<String> allDemoTitles = kAllGalleryDemos.map((GalleryDemo demo) => demo.title).toList();
+    if (!new Set<String>.from(allDemoTitles).containsAll(_kUnsynchronizedDemoTitles))
+      fail('Unrecognized demo titles in _kUnsynchronizedDemosTitles: $_kUnsynchronizedDemoTitles');
+    if (!new Set<String>.from(allDemoTitles).containsAll(_kSkippedDemoTitles))
+      fail('Unrecognized demo names in _kSkippedDemoTitles: $_kSkippedDemoTitles');
 
     runApp(const GalleryApp());
     final _LiveWidgetController controller = new _LiveWidgetController();
-    for (String demo in _kAllDemos) {
-      print('Testing "$demo" demo');
-      final Finder menuItem = find.text(demo);
-      await controller.scrollIntoView(menuItem, alignment: 0.5);
-
-      if (_kSkippedDemos.contains(demo)) {
-        print('> skipped $demo');
-        continue;
-      }
-
-      for (int i = 0; i < 2; i += 1) {
-        await controller.tap(menuItem); // Launch the demo
-        controller.frameSync = !_kUnsynchronizedDemos.contains(demo);
-        await controller.tap(find.byTooltip('Back'));
-        controller.frameSync = true;
+    for (GalleryDemoCategory category in kAllGalleryDemoCategories) {
+      await controller.tap(find.text(category.name));
+      for (GalleryDemo demo in kGalleryCategoryToDemos[category]) {
+        final Finder demoItem = find.text(demo.title);
+        await controller.scrollIntoView(demoItem, alignment: 0.5);
+
+        if (_kSkippedDemoTitles.contains(demo.title)) {
+          print('> skipped $demo');
+          continue;
+        }
+
+        for (int i = 0; i < 2; i += 1) {
+          await controller.tap(demoItem); // Launch the demo
+          controller.frameSync = !_kUnsynchronizedDemoTitles.contains(demo.title);
+          await controller.tap(find.byTooltip('Back'));
+          controller.frameSync = true;
+        }
+        print('Success');
       }
-      print('Success');
+      await controller.tap(find.byTooltip('Back'));
     }
 
     _kTestChannel.invokeMethod('success');

examples/flutter_gallery/test/pesto_test.dart

@@ -17,7 +17,7 @@ void main() {
       // The bug only manifests itself when the screen's orientation is portrait
       const Center(
         child: const SizedBox(
-          width: 400.0,
+          width: 450.0,
           height: 800.0,
           child: const GalleryApp()
         )
@@ -26,29 +26,32 @@ void main() {
     await tester.pump(); // see https://github.com/flutter/flutter/issues/1865
     await tester.pump(); // triggers a frame
 
+    await tester.tap(find.text('Vignettes'));
+    await tester.pumpAndSettle();
+
     await tester.tap(find.text('Pesto'));
-    await tester.pump(); // Launch pesto
-    await tester.pump(const Duration(seconds: 1)); // transition is complete
+    await tester.pumpAndSettle();
 
     await tester.tap(find.text('Pesto Bruschetta'));
-    await tester.pump(); // Launch the recipe page
-    await tester.pump(const Duration(seconds: 1)); // transition is complete
+    await tester.pumpAndSettle();
 
     await tester.drag(find.text('Pesto Bruschetta'), const Offset(0.0, -300.0));
-    await tester.pump();
+    await tester.pumpAndSettle();
 
     Navigator.pop(find.byType(Scaffold).evaluate().single);
-    await tester.pump();
-    await tester.pump(const Duration(seconds: 1)); // transition is complete
+    await tester.pumpAndSettle();
   });
 
   testWidgets('Pesto can be scrolled all the way down', (WidgetTester tester) async {
     await tester.pumpWidget(const GalleryApp());
     await tester.pump(); // see https://github.com/flutter/flutter/issues/1865
+    await tester.pump(); // triggers a frame
+
+    await tester.tap(find.text('Vignettes'));
+    await tester.pumpAndSettle();
 
     await tester.tap(find.text('Pesto'));
-    await tester.pump(); // Launch pesto
-    await tester.pump(const Duration(seconds: 1)); // transition is complete
+    await tester.pumpAndSettle();
 
     await tester.fling(find.text('Pesto Bruschetta'), const Offset(0.0, -200.0), 10000.0);
     await tester.pumpAndSettle(); // start and finish fling

examples/flutter_gallery/test/simple_smoke_test.dart

@@ -16,37 +16,29 @@ void main() {
     await tester.pump(); // see https://github.com/flutter/flutter/issues/1865
     await tester.pump(); // triggers a frame
 
-    final Finder finder = find.byWidgetPredicate((Widget widget) {
-      return widget is Tooltip && widget.message == 'Open navigation menu';
-    });
-    expect(finder, findsOneWidget);
+    final Finder showOptionsPageButton = find.byTooltip('Show options page');
 
-    // Open drawer
-    await tester.tap(finder);
-    await tester.pump(); // start animation
-    await tester.pump(const Duration(seconds: 1)); // end animation
+    // Show the options page
+    await tester.tap(showOptionsPageButton);
+    await tester.pumpAndSettle();
 
-    // Change theme
-    await tester.tap(find.text('Dark'));
-    await tester.pump(); // start animation
-    await tester.pump(const Duration(seconds: 1)); // end animation
+    // Switch to the dark theme: the first switch control
+    await tester.tap(find.byType(Switch).first);
+    await tester.pumpAndSettle();
 
-    // Close drawer
-    await tester.tap(find.byType(DrawerController));
-    await tester.pump(); // start animation
-    await tester.pump(const Duration(seconds: 1)); // end animation
+    // Close the options page
+    expect(showOptionsPageButton, findsOneWidget);
+    await tester.tap(showOptionsPageButton);
+    await tester.pumpAndSettle();
 
-    // Open Demos
+    // Show the vignettes
     await tester.tap(find.text('Vignettes'));
-    await tester.pump(); // start animation
-    await tester.pump(const Duration(seconds: 1)); // end animation
+    await tester.pumpAndSettle();
 
-    // Open Flexible space toolbar
+    // Show the Contact profile demo and scroll it upwards
     await tester.tap(find.text('Contact profile'));
-    await tester.pump(); // start animation
-    await tester.pump(const Duration(seconds: 1)); // end animation
+    await tester.pumpAndSettle();
 
-    // Scroll it up
     await tester.drag(find.text('(650) 555-1234'), const Offset(0.0, -50.0));
     await tester.pump(const Duration(milliseconds: 200));
     await tester.drag(find.text('(650) 555-1234'), const Offset(0.0, -50.0));

examples/flutter_gallery/test/smoke_test.dart

@@ -2,31 +2,21 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-import 'dart:collection' show LinkedHashSet;
 import 'dart:math' as math;
 
 import 'package:flutter/material.dart';
 import 'package:flutter/rendering.dart';
 import 'package:flutter_test/flutter_test.dart';
-import 'package:flutter_gallery/gallery/item.dart' show GalleryItem, kAllGalleryItems;
+import 'package:flutter_gallery/gallery/demos.dart';
 import 'package:flutter_gallery/gallery/app.dart' show GalleryApp;
 
-const String kCaption = 'Flutter Gallery';
+// This title is visible on the home and demo category pages. It's
+// not visible when the demos are running.
+const String kGalleryTitle = 'Flutter gallery';
 
-final List<String> demoCategories = new LinkedHashSet<String>.from(
-  kAllGalleryItems.map<String>((GalleryItem item) => item.category)
-).toList();
-
-final List<String> routeNames =
-  kAllGalleryItems.map((GalleryItem item) => item.routeName).toList();
-
-Finder findGalleryItemByRouteName(WidgetTester tester, String routeName) {
-  return find.byWidgetPredicate((Widget widget) {
-    return widget is GalleryItem && widget.routeName == routeName;
-  });
-}
-
-int errors = 0;
+// All of the classes printed by debugDump etc, must have toString()
+// values approved by verityToStringOutput().
+int toStringErrors = 0;
 
 void reportToStringError(String name, String route, int lineNumber, List<String> lines, String message) {
   // If you're on line 12, then it has index 11.
@@ -36,7 +26,7 @@ void reportToStringError(String name, String route, int lineNumber, List<String>
   final int firstLine = math.max(0, lineNumber - margin);
   final int lastLine = math.min(lines.length, lineNumber + margin);
   print('$name : $route : line $lineNumber of ${lines.length} : $message; nearby lines were:\n  ${lines.sublist(firstLine, lastLine).join("\n  ")}');
-  errors += 1;
+  toStringErrors += 1;
 }
 
 void verifyToStringOutput(String name, String route, String testString) {
@@ -56,22 +46,16 @@ void verifyToStringOutput(String name, String route, String testString) {
   }
 }
 
-// Start a gallery demo and then go back. This function assumes that the
-// we're starting on the home route and that the submenu that contains
-// the item for a demo that pushes route 'routeName' is already open.
-Future<Null> smokeDemo(WidgetTester tester, String routeName) async {
-  // Ensure that we're (likely to be) on the home page
-  final Finder menuItem = findGalleryItemByRouteName(tester, routeName);
-  expect(menuItem, findsOneWidget);
-
+Future<Null> smokeDemo(WidgetTester tester, GalleryDemo demo) async {
+  print(demo);
   // Don't use pumpUntilNoTransientCallbacks in this function, because some of
   // the smoketests have infinitely-running animations (e.g. the progress
   // indicators demo).
 
-  await tester.tap(menuItem);
+  await tester.tap(find.text(demo.title));
   await tester.pump(); // Launch the demo.
   await tester.pump(const Duration(milliseconds: 400)); // Wait until the demo has opened.
-  expect(find.text(kCaption), findsNothing);
+  expect(find.text(kGalleryTitle), findsNothing);
 
   // Leave the demo on the screen briefly for manual testing.
   await tester.pump(const Duration(milliseconds: 400));
@@ -85,6 +69,7 @@ Future<Null> smokeDemo(WidgetTester tester, String routeName) async {
   await tester.pump(const Duration(milliseconds: 400));
 
   // Verify that the dumps are pretty.
+  final String routeName = demo.routeName;
   verifyToStringOutput('debugDumpApp', routeName, WidgetsBinding.instance.renderViewElement.toStringDeep());
   verifyToStringOutput('debugDumpRenderTree', routeName, RendererBinding.instance?.renderView?.toStringDeep());
   verifyToStringOutput('debugDumpLayerTree', routeName, RendererBinding.instance?.renderView?.debugLayer?.toStringDeep());
@@ -108,74 +93,85 @@ Future<Null> smokeDemo(WidgetTester tester, String routeName) async {
   await tester.pump(); // Start the pop "back" operation.
   await tester.pump(); // Complete the willPop() Future.
   await tester.pump(const Duration(milliseconds: 400)); // Wait until it has finished.
-
-  return null;
 }
 
-Future<Null> runSmokeTest(WidgetTester tester) async {
-  bool hasFeedback = false;
-  void mockOnSendFeedback() {
-    hasFeedback = true;
-  }
+Future<Null> smokeOptionsPage(WidgetTester tester) async {
+  final Finder showOptionsPageButton = find.byTooltip('Show options page');
 
-  await tester.pumpWidget(new GalleryApp(onSendFeedback: mockOnSendFeedback));
-  await tester.pump(); // see https://github.com/flutter/flutter/issues/1865
-  await tester.pump(); // triggers a frame
+  // Show the options page
+  await tester.tap(showOptionsPageButton);
+  await tester.pumpAndSettle();
 
-  expect(find.text(kCaption), findsOneWidget);
+  // Switch to the dark theme: first switch control
+  await tester.tap(find.byType(Switch).first);
+  await tester.pumpAndSettle();
 
-  for (String routeName in routeNames) {
-    final Finder finder = findGalleryItemByRouteName(tester, routeName);
-    Scrollable.ensureVisible(tester.element(finder), alignment: 0.5);
-    await tester.pumpAndSettle();
-    await smokeDemo(tester, routeName);
-    tester.binding.debugAssertNoTransientCallbacks('A transient callback was still active after leaving route $routeName');
-  }
-  expect(errors, 0);
+  // Switch back to the light theme: first switch control again
+  await tester.tap(find.byType(Switch).first);
+  await tester.pumpAndSettle();
 
-  final Finder navigationMenuButton = find.byTooltip('Open navigation menu');
-  expect(navigationMenuButton, findsOneWidget);
-  await tester.tap(navigationMenuButton);
-  await tester.pump(); // Start opening drawer.
-  await tester.pump(const Duration(seconds: 1)); // Wait until it's really opened.
+  // Popup the text size menu: first menu button, choose 'Small'
+  await tester.tap(find.byIcon(Icons.arrow_drop_down).first);
+  await tester.pumpAndSettle();
+  await tester.tap(find.text('Small'));
+  await tester.pumpAndSettle();
 
-  // Switch theme.
-  await tester.tap(find.text('Dark'));
-  await tester.pump();
-  await tester.pump(const Duration(seconds: 1)); // Wait until it's changed.
+  // Popup the text size menu: first menu button, choose 'Normal'
+  await tester.tap(find.byIcon(Icons.arrow_drop_down).first);
+  await tester.pumpAndSettle();
+  await tester.tap(find.text('Normal'));
+  await tester.pumpAndSettle();
 
-  // Switch theme.
-  await tester.tap(find.text('Light'));
-  await tester.pump();
-  await tester.pump(const Duration(seconds: 1)); // Wait until it's changed.
+  // Scroll the 'Send feedback' item into view
+  await tester.drag(find.text('Normal'), const Offset(0.0, -1000.0));
+  await tester.pumpAndSettle();
+  await tester.tap(find.text('Send feedback'));
+  await tester.pumpAndSettle();
 
-  // Switch font scale.
-  await tester.tap(find.text('Small'));
-  await tester.pump();
-  await tester.pump(const Duration(seconds: 1)); // Wait until it's changed.
-  // Switch font scale back to default.
-  await tester.tap(find.text('System Default'));
-  await tester.pump();
-  await tester.pump(const Duration(seconds: 1)); // Wait until it's changed.
+  // Close the options page
+  expect(showOptionsPageButton, findsOneWidget);
+  await tester.tap(showOptionsPageButton);
+  await tester.pumpAndSettle();
+}
 
-  // Scroll the 'Send feedback' item into view.
-  await tester.drag(find.text('Small'), const Offset(0.0, -1000.0));
-  await tester.pump();
-  await tester.pump(const Duration(seconds: 1)); // Wait until it's changed.
+Future<Null> smokeGallery(WidgetTester tester) async {
+  bool sendFeedbackButtonPressed = false;
 
-  // Send feedback.
-  expect(hasFeedback, false);
-  await tester.tap(find.text('Send feedback'));
-  await tester.pump();
-  expect(hasFeedback, true);
+  await tester.pumpWidget(
+    new GalleryApp(
+      onSendFeedback: () {
+        sendFeedbackButtonPressed = true; // see smokeOptionsPage()
+      },
+    ),
+  );
+  await tester.pump(); // see https://github.com/flutter/flutter/issues/1865
+  await tester.pump(); // triggers a frame
+
+  expect(find.text(kGalleryTitle), findsOneWidget);
+
+  for (GalleryDemoCategory category in kAllGalleryDemoCategories) {
+    await tester.tap(find.text(category.name));
+    await tester.pumpAndSettle();
+    for (GalleryDemo demo in kGalleryCategoryToDemos[category]) {
+      Scrollable.ensureVisible(tester.element(find.text(demo.title)), alignment: 0.5);
+      await smokeDemo(tester, demo);
+      tester.binding.debugAssertNoTransientCallbacks('A transient callback was still active after running $demo');
+    }
+    await tester.pageBack();
+    await tester.pumpAndSettle();
+  }
+  expect(toStringErrors, 0);
+
+  await smokeOptionsPage(tester);
+  expect(sendFeedbackButtonPressed, true);
 }
 
 void main() {
-  testWidgets('Flutter Gallery app smoke test', runSmokeTest);
+  testWidgets('Flutter Gallery app smoke test', smokeGallery);
 
   testWidgets('Flutter Gallery app smoke test with semantics', (WidgetTester tester) async {
     RendererBinding.instance.setSemanticsEnabled(true);
-    await runSmokeTest(tester);
+    await smokeGallery(tester);
     RendererBinding.instance.setSemanticsEnabled(false);
   });
 }

examples/flutter_gallery/test/update_test.dart

@@ -3,7 +3,7 @@
 // found in the LICENSE file.
 
 import 'package:flutter_test/flutter_test.dart';
-import 'package:flutter_gallery/gallery/app.dart';
+import 'package:flutter_gallery/gallery/app.dart' show GalleryApp;
 
 Future<String> mockUpdateUrlFetcher() {
   // A real implementation would connect to the network to retrieve this value
@@ -26,8 +26,8 @@ void main() {
     await tester.tap(find.text('NO THANKS'));
     await tester.pump();
 
-    await tester.tap(find.text('Shrine'));
-    await tester.pump(); // Launch shrine
+    await tester.tap(find.text('Vignettes'));
+    await tester.pump(); // Launch
     await tester.pump(const Duration(seconds: 1)); // transition is complete
 
     final Finder backButton = find.byTooltip('Back');

examples/flutter_gallery/test_driver/memory_nav_test.dart

@@ -14,14 +14,17 @@ void main() {
     });
 
     test('navigation', () async {
-      final SerializableFinder menuItem = find.text('Text fields');
-      await driver.scrollUntilVisible(find.byType('CustomScrollView'), menuItem,
+      await driver.tap(find.text('Material'));
+
+      final SerializableFinder demoList = find.byValueKey('GalleryDemoList');
+      final SerializableFinder demoItem = find.text('Text fields');
+      await driver.scrollUntilVisible(demoList, demoItem,
         dyScroll: -300.0,
         alignment: 0.5,
         timeout: const Duration(minutes: 1),
       );
       for (int i = 0; i < 15; i++) {
-        await driver.tap(menuItem);
+        await driver.tap(demoItem);
         await driver.tap(find.byTooltip('Back'));
       }
     });

examples/flutter_gallery/test_driver/scroll_perf_test.dart

@@ -22,24 +22,21 @@ void main() {
 
     test('measure', () async {
       final Timeline timeline = await driver.traceAction(() async {
-        final SerializableFinder home = find.byValueKey('Gallery List');
-        expect(home, isNotNull);
+        await driver.tap(find.text('Material'));
 
-        await driver.tap(find.text('Vignettes'));
-        await driver.tap(find.text('Components'));
-        await driver.tap(find.text('Style'));
+        final SerializableFinder demoList = find.byValueKey('GalleryDemoList');
 
         // TODO(eseidel): These are very artificial scrolls, we should use better
         // https://github.com/flutter/flutter/issues/3316
         // Scroll down
         for (int i = 0; i < 5; i++) {
-          await driver.scroll(home, 0.0, -300.0, const Duration(milliseconds: 300));
+          await driver.scroll(demoList, 0.0, -300.0, const Duration(milliseconds: 300));
           await new Future<Null>.delayed(const Duration(milliseconds: 500));
         }
 
         // Scroll up
         for (int i = 0; i < 5; i++) {
-          await driver.scroll(home, 0.0, 300.0, const Duration(milliseconds: 300));
+          await driver.scroll(demoList, 0.0, 300.0, const Duration(milliseconds: 300));
           await new Future<Null>.delayed(const Duration(milliseconds: 500));
         }
       });

examples/flutter_gallery/test_driver/transitions_perf.dart

@@ -6,13 +6,13 @@ import 'dart:async';
 import 'dart:convert' show JsonEncoder;
 
 import 'package:flutter_driver/driver_extension.dart';
-import 'package:flutter_gallery/gallery/item.dart';
+import 'package:flutter_gallery/gallery/demos.dart';
 import 'package:flutter_gallery/main.dart' as app;
 
 Future<String> _handleMessages(String message) async {
   assert(message == 'demoNames');
   return const JsonEncoder.withIndent('  ').convert(
-    kAllGalleryItems.map((GalleryItem item) => item.title).toList(),
+    kAllGalleryDemos.map((GalleryDemo demo) => '${demo.title}@${demo.category.name}').toList(),
   );
 }
 

examples/flutter_gallery/test_driver/transitions_perf_test.dart

@@ -45,8 +45,7 @@ const List<String> kUnsynchronizedDemos = const <String>[
   'Video',
 ];
 
-// All of the gallery demo titles in the order they appear on the
-// gallery home page.
+// All of the gallery demos, identified as "title@category".
 //
 // These names are reported by the test app, see _handleMessages()
 // in transitions_perf.dart.
@@ -121,20 +120,26 @@ Future<Null> saveDurationsHistogram(List<Map<String, dynamic>> events, String ou
 /// Scrolls each demo menu item into view, launches it, then returns to the
 /// home screen twice.
 Future<Null> runDemos(List<String> demos, FlutterDriver driver) async {
+  final SerializableFinder demoList = find.byValueKey('GalleryDemoList');
+  String currentDemoCategory;
+
   for (String demo in demos) {
-    print('Testing "$demo" demo');
-    final SerializableFinder menuItem = find.text(demo);
-    await driver.scrollUntilVisible(find.byType('CustomScrollView'), menuItem,
-      dyScroll: -48.0,
-      alignment: 0.5,
-    );
+    final String demoAtCategory = _allDemos.firstWhere((String s) => s.startsWith(demo));
+    final String demoCategory = demoAtCategory.substring(demoAtCategory.indexOf('@') + 1);
+
+    if (currentDemoCategory == null) {
+      await driver.tap(find.text(demoCategory));
+    } else if (currentDemoCategory != demoCategory) {
+      await driver.tap(find.byTooltip('Back'));
+      await driver.tap(find.text(demoCategory));
+    }
+    currentDemoCategory = demoCategory;
 
-    for (int i = 0; i < 2; i += 1) {
-      await driver.tap(menuItem); // Launch the demo
+    final SerializableFinder demoItem = find.text(demo);
+    await driver.scrollUntilVisible(demoList, demoItem, dyScroll: -48.0,  alignment: 0.5);
 
-      // This demo's back button isn't initially visible.
-      if (demo == 'Backdrop')
-        await driver.tap(find.byTooltip('Tap to dismiss'));
+    for (int i = 0; i < 2; i += 1) {
+      await driver.tap(demoItem); // Launch the demo
 
       if (kUnsynchronizedDemos.contains(demo)) {
         await driver.runUnsynchronized<Future<Null>>(() async {
@@ -144,8 +149,12 @@ Future<Null> runDemos(List<String> demos, FlutterDriver driver) async {
         await driver.tap(find.byTooltip('Back'));
       }
     }
+
     print('Success');
   }
+
+  // Return to the home screen
+  await driver.tap(find.byTooltip('Back'));
 }
 
 void main([List<String> args = const <String>[]]) {
@@ -171,6 +180,7 @@ void main([List<String> args = const <String>[]]) {
     });
 
     test('all demos', () async {
+
       // Collect timeline data for just a limited set of demos to avoid OOMs.
       final Timeline timeline = await driver.traceAction(
         () async {
@@ -190,14 +200,9 @@ void main([List<String> args = const <String>[]]) {
       final String histogramPath = path.join(testOutputsDirectory, 'transition_durations.timeline.json');
       await saveDurationsHistogram(timeline.json['traceEvents'], histogramPath);
 
-      // Scroll back to the top
-      await driver.scrollUntilVisible(find.byType('CustomScrollView'), find.text(_allDemos[0]),
-        dyScroll: 200.0,
-        alignment: 0.0
-      );
-
       // Execute the remaining tests.
-      final Set<String> unprofiledDemos = new Set<String>.from(_allDemos)..removeAll(kProfiledDemos);
+      final List<String> allDemoNames = _allDemos.map((String s) => s.substring(0, s.indexOf('@')));
+      final Set<String> unprofiledDemos = new Set<String>.from(allDemoNames)..removeAll(kProfiledDemos);
       await runDemos(unprofiledDemos.toList(), driver);
 
     }, timeout: const Timeout(const Duration(minutes: 5)));

packages/flutter/lib/src/services/asset_bundle.dart

@@ -67,8 +67,8 @@ abstract class AssetBundle {
     final ByteData data = await load(key);
     if (data == null)
       throw new FlutterError('Unable to load asset: $key');
-    if (data.lengthInBytes < 10 * 1024) {
-      // 10KB takes about 3ms to parse on a Pixel 2 XL.
+    if (data.lengthInBytes < 20 * 1024) {
+      // 20KB takes about 6ms to parse on a Pixel 2 XL.
       // See: https://github.com/dart-lang/sdk/issues/31954
       return utf8.decode(data.buffer.asUint8List());
     }