Temp store.

Samples/UIWidgetsGallery/demo/material/buttons_demo.cs

     const String _outlineCode = "buttons_outline";
 
     const String _dropdownText =
-        "A dropdown button displays a menu that\"s used to select a value from a " +
+        "A dropdown button displays a menu that's used to select a value from a " +
             "small set of values. The button displays the current value and a down " +
             "arrow.";
 
         "IconButtons are appropriate for toggle buttons that allow a single choice " +
-            "to be selected or deselected, such as adding or removing an item\"s star.";
+            "to be selected or deselected, such as adding or removing an item's star.";
 
     const String _iconCode = "buttons_icon";
 

Samples/UIWidgetsGallery/gallery/app.cs

             VoidCallback onSendFeedback = null,
             bool testMode = false
         ) : base(key: key) {
+            this.updateUrlFetcher = updateUrlFetcher;
+            this.enablePerformanceOverlay = enablePerformanceOverlay;
+            this.enableRasterCacheImagesCheckerboard = enableRasterCacheImagesCheckerboard;
+            this.enableOffscreenLayersCheckerboard = enableOffscreenLayersCheckerboard;
+            this.onSendFeedback = onSendFeedback;
+            this.testMode = testMode;
         }
 
         public readonly UpdateUrlFetcher updateUrlFetcher;
                 if (this._options.timeDilation != newOptions.timeDilation) {
                     this._timeDilationTimer?.cancel();
                     this._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.
+                    if (newOptions.timeDilation > 1.0f) {
                         this._timeDilationTimer = Window.instance.run(new TimeSpan(0, 0, 0, 0, 150),
                             () => { SchedulerBinding.instance.timeDilation = newOptions.timeDilation; });
                     } else {

Samples/UIWidgetsGallery/gallery/backdrop.cs

 
     public class Backdrop : StatefulWidget {
         public Backdrop(
-            Widget frontAction,
-            Widget frontTitle,
-            Widget frontHeading,
-            Widget frontLayer,
-            Widget backTitle,
-            Widget backLayer
+            Widget frontAction = null,
+            Widget frontTitle = null,
+            Widget frontHeading = null,
+            Widget frontLayer = null,
+            Widget backTitle = null,
+            Widget backLayer = null
         ) {
             this.frontAction = frontAction;
             this.frontTitle = frontTitle;

Samples/UIWidgetsGallery/gallery/home.cs

                     decoration: new BoxDecoration(
                         image: new DecorationImage(
                             image: new AssetImage(
-                                "logos/unity.png")
+                                "unity.png")
                         )
                     )
                 )
         public static bool showPreviewBanner = true;
 
         public override State createState() {
-            // return new _GalleryHomeState();
-            return null;
+            return new _GalleryHomeState();
-//    class _GalleryHomeState : SingleTickerProviderStateMixin<GalleryHome> {
-//        static readonly GlobalKey<ScaffoldState> _scaffoldKey = GlobalKey<ScaffoldState>.key();
-//        AnimationController _controller;
-//        GalleryDemoCategory _category;
-//
-//        static Widget _topHomeLayout(Widget currentChild, List<Widget> previousChildren) {
-//            List<Widget> children = previousChildren;
-//            if (currentChild != null) {
-//                children = children.ToList();
-//                children.Add(currentChild);
-//            }
-//
-//            return new Stack(
-//                children: children,
-//                alignment: Alignment.topCenter
-//            );
-//        }
-//
-//        public static AnimatedSwitcherLayoutBuilder _centerHomeLayout = AnimatedSwitcher.defaultLayoutBuilder;
-//
-//        public override void initState() {
-//            base.initState();
-//            this._controller = new AnimationController(
-//                duration: new TimeSpan(0, 0, 0, 0, 600),
-//                debugLabel: "preview banner",
-//                vsync: this
-//            );
-//            this._controller.forward();
-//        }
-//
-//        public override void dispose() {
-//            this._controller.dispose();
-//            base.dispose();
-//        }
-//
-//        public override Widget build(BuildContext context) {
-//            ThemeData theme = Theme.of(context);
-//            bool isDark = theme.brightness == Brightness.dark;
-//            MediaQueryData media = MediaQuery.of(context);
-//            bool centerHome = media.orientation == Orientation.portrait && media.size.height < 800.0;
-//
-//            Curve switchOutCurve = new Interval(0.4f, 1.0f, curve: Curves.fastOutSlowIn);
-//            Curve switchInCurve = new Interval(0.4f, 1.0f, curve: Curves.fastOutSlowIn);
-//
-//            Widget home = new Scaffold(
-//                key: _scaffoldKey,
-//                backgroundColor: isDark ? HomeUtils._kUIWidgetsBlue : theme.primaryColor,
-//                body: new SafeArea(
-//                    bottom: false,
-//                    child: new WillPopScope(
-//                        onWillPop: () => {
-//                            // Pop the category page if Android back button is pressed.
-//                            if (this._category != null) {
-//                                this.setState(() => this._category = null);
-//                                return Promise<bool>.Resolved(false);
-//                            }
-//                            return Promise<bool>.Resolved(true);
-//                        },
-//                        child: new Backdrop(
-//                            backTitle: new Text("Options"),
-//                            backLayer: this.widget.optionsPage,
-//                            frontAction: new AnimatedSwitcher(
-//                                duration: HomeUtils._kFrontLayerSwitchDuration,
-//                                switchOutCurve: switchOutCurve,
-//                                switchInCurve: switchInCurve,
-//                                child: this._category == null
-//                                    ? (Widget) new _UIWidgetsLogo()
-//                                    : new IconButton(
-//                                        icon: new BackButtonIcon(),
-//                                        tooltip: "Back",
-//                                        onPressed: () => this.setState(() => this._category = null)
-//                                    )
-//                            ),
-//                            frontTitle: new AnimatedSwitcher(
-//                                duration: HomeUtils._kFrontLayerSwitchDuration,
-//                                child: this._category == null
-//                                    ? new Text("Flutter gallery")
-//                                    : new Text(this._category.name)
-//                            ),
-//                            frontHeading: this.widget.testMode ? null : new Container(height: 24.0f),
-//                            frontLayer: new AnimatedSwitcher(
-//                                duration: HomeUtils._kFrontLayerSwitchDuration,
-//                                switchOutCurve: switchOutCurve,
-//                                switchInCurve: switchInCurve,
-//                                layoutBuilder: centerHome ? _centerHomeLayout : _topHomeLayout,
-//                                child: this._category != null
-//                                    ? (Widget) new _DemosPage(this._category)
-//                                    : new _CategoriesPage(
-//                                        categories: DemoUtils.kAllGalleryDemoCategories,
-//                                        onCategoryTap: (GalleryDemoCategory category) => {
-//                                            this.setState(() => this._category = category);
-//                                        }
-//                                    )
-//                            )
-//                        )
-//                    )
-//                )
-//            );
-//
-//            D.assert(() => {
-//                GalleryHome.showPreviewBanner = false;
-//                return true;
-//            });
-//
-//            if (GalleryHome.showPreviewBanner) {
-//                home = new Stack(
-//                    fit: StackFit.expand,
-//                    children: new List<Widget> {
-//                        home,
-//                        new FadeTransition(
-//                            opacity: new CurvedAnimation(parent: this._controller, curve: Curves.easeInOut),
-//                            child: new Banner(
-//                                message: "PREVIEW",
-//                                location: BannerLocation.topEnd
-//                            )
-//                        )
-//                    }
-//                );
-//            }
-//            home = new AnnotatedRegion<SystemUiOverlayStyle>(
-//                child: home,
-//                value: SystemUiOverlayStyle.light
-//            );
-//
-//            return home;
-//        }
-//  }
-}
+    class _GalleryHomeState : SingleTickerProviderStateMixin<GalleryHome> {
+        static readonly GlobalKey<ScaffoldState> _scaffoldKey = GlobalKey<ScaffoldState>.key();
+        AnimationController _controller;
+        GalleryDemoCategory _category;
+
+        static Widget _topHomeLayout(Widget currentChild, List<Widget> previousChildren) {
+            List<Widget> children = previousChildren;
+            if (currentChild != null) {
+                children = children.ToList();
+                children.Add(currentChild);
+            }
+
+            return new Stack(
+                children: children,
+                alignment: Alignment.topCenter
+            );
+        }
+
+        public static AnimatedSwitcherLayoutBuilder _centerHomeLayout = AnimatedSwitcher.defaultLayoutBuilder;
+
+        public override void initState() {
+            base.initState();
+            this._controller = new AnimationController(
+                duration: new TimeSpan(0, 0, 0, 0, 600),
+                debugLabel: "preview banner",
+                vsync: this
+            );
+            this._controller.forward();
+        }
+
+        public override void dispose() {
+            this._controller.dispose();
+            base.dispose();
+        }
+
+        public override Widget build(BuildContext context) {
+            ThemeData theme = Theme.of(context);
+            bool isDark = theme.brightness == Brightness.dark;
+            MediaQueryData media = MediaQuery.of(context);
+            bool centerHome = media.orientation == Orientation.portrait && media.size.height < 800.0;
+
+            Curve switchOutCurve = new Interval(0.4f, 1.0f, curve: Curves.fastOutSlowIn);
+            Curve switchInCurve = new Interval(0.4f, 1.0f, curve: Curves.fastOutSlowIn);
+
+            Widget home = new Scaffold(
+                key: _scaffoldKey,
+                backgroundColor: isDark ? HomeUtils._kUIWidgetsBlue : theme.primaryColor,
+                body: new SafeArea(
+                    bottom: false,
+                    child: new WillPopScope(
+                        onWillPop: () => {
+                            if (this._category != null) {
+                                this.setState(() => this._category = null);
+                                return Promise<bool>.Resolved(false);
+                            }
+
+                            return Promise<bool>.Resolved(true);
+                        },
+                        child: new Backdrop(
+                            backTitle: new Text("Options"),
+                            backLayer: this.widget.optionsPage,
+                            frontAction: new AnimatedSwitcher(
+                                duration: HomeUtils._kFrontLayerSwitchDuration,
+                                switchOutCurve: switchOutCurve,
+                                switchInCurve: switchInCurve,
+                                child: this._category == null
+                                    ? (Widget) new _UIWidgetsLogo()
+                                    : new IconButton(
+                                        icon: new BackButtonIcon(),
+                                        tooltip: "Back",
+                                        onPressed: () => this.setState(() => this._category = null)
+                                    )
+                            ),
+                            frontTitle: new AnimatedSwitcher(
+                                duration: HomeUtils._kFrontLayerSwitchDuration,
+                                child: this._category == null
+                                    ? new Text("Flutter gallery")
+                                    : new Text(this._category.name)
+                            ),
+                            frontHeading: this.widget.testMode ? null : new Container(height: 24.0f),
+                            frontLayer: new AnimatedSwitcher(
+                                duration: HomeUtils._kFrontLayerSwitchDuration,
+                                switchOutCurve: switchOutCurve,
+                                switchInCurve: switchInCurve,
+                                layoutBuilder: centerHome ? _centerHomeLayout : _topHomeLayout,
+                                child: this._category != null
+                                    ? (Widget) new _DemosPage(this._category)
+                                    : new _CategoriesPage(
+                                        categories: DemoUtils.kAllGalleryDemoCategories,
+                                        onCategoryTap: (GalleryDemoCategory category) => {
+                                            this.setState(() => this._category = category);
+                                        }
+                                    )
+                            )
+                        )
+                    )
+                )
+            );
+
+            D.assert(() => {
+                GalleryHome.showPreviewBanner = false;
+                return true;
+            });
+
+            if (GalleryHome.showPreviewBanner) {
+                home = new Stack(
+                    fit: StackFit.expand,
+                    children: new List<Widget> {
+                        home,
+                        new FadeTransition(
+                            opacity: new CurvedAnimation(parent: this._controller, curve: Curves.easeInOut),
+                            child: new Banner(
+                                message: "PREVIEW",
+                                location: BannerLocation.topEnd
+                            )
+                        )
+                    }
+                );
+            }
+
+            home = new AnnotatedRegion<SystemUiOverlayStyle>(
+                child: home,
+                value: SystemUiOverlayStyle.light
+            );
+
+            return home;
+        }
+    }
+}

Samples/UIWidgetsGallery/GalleryMain.cs

+using UIWidgetsGallery.gallery;
+using Unity.UIWidgets.engine;
+using Unity.UIWidgets.material;
+using Unity.UIWidgets.widgets;
+
+namespace UIWidgetsGallery {
+    public class GalleryMain : UIWidgetsPanel {
+        protected override Widget createWidget() {
+            return new GalleryApp();
+        }
+    }
+}

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Samples/UIWidgetsGallery/main.cs

-using Unity.UIWidgets.engine;
-
-namespace UIWidgetsGallery {
-    public class GalleryMain : UIWidgetsPanel {
-        
-    }
-}