[Cupertino] Fix bugs & Update Gallery.

Runtime/cupertino/nav_bar.cs

 using Color = Unity.UIWidgets.ui.Color;
 using Rect = Unity.UIWidgets.ui.Rect;
 using TextStyle = Unity.UIWidgets.painting.TextStyle;
-using Transform = Unity.UIWidgets.widgets.Transform;
 
 namespace Unity.UIWidgets.cupertino {
     class NavBarUtils {
         public static readonly _HeroTag _defaultHeroTag = new _HeroTag(null);
 
         public static Widget _wrapWithBackground(
-            Border border,
-            Color backgroundColor,
-            Widget child,
+            Border border = null,
+            Color backgroundColor = null,
+            Widget child = null,
             bool updateSystemUiOverlay = true
         ) {
             Widget result = child;
             bool transitionBetweenRoutes = true,
             object heroTag = null
         ) : base(key: key) {
-            D.assert(
-                heroTag != null,
-                () => "heroTag cannot be null. Use transitionBetweenRoutes = false to " +
-                      "disable Hero transition on this navigation bar."
-            );
-            D.assert(
-                !transitionBetweenRoutes || ReferenceEquals(heroTag, NavBarUtils._defaultHeroTag),
-                () => "Cannot specify a heroTag override if this navigation bar does not " +
-                      "transition due to transitionBetweenRoutes = false."
-            );
             this.leading = leading;
             this.automaticallyImplyLeading = automaticallyImplyLeading;
             this.automaticallyImplyMiddle = automaticallyImplyMiddle;
             this.actionsForegroundColor = actionsForegroundColor;
             this.transitionBetweenRoutes = transitionBetweenRoutes;
             this.heroTag = heroTag ?? NavBarUtils._defaultHeroTag;
+
+            D.assert(
+                this.heroTag != null,
+                () => "heroTag cannot be null. Use transitionBetweenRoutes = false to " +
+                      "disable Hero transition on this navigation bar."
+            );
+
+            D.assert(
+                !transitionBetweenRoutes || ReferenceEquals(this.heroTag, NavBarUtils._defaultHeroTag),
+                () => "Cannot specify a heroTag override if this navigation bar does not " +
+                      "transition due to transitionBetweenRoutes = false."
+            );
         }
 
         public readonly Widget leading;
             EdgeInsets padding = null,
             bool? middleVisible = null
         ) : base(key: key) {
+            this.components = components;
+            this.padding = padding;
+            this.middleVisible = middleVisible ?? true;
         }
 
         public readonly _NavigationBarStaticComponents components;
 
 
     class _BackChevron : StatelessWidget {
-        public _BackChevron(Key key = null) : base(key: key) {
-        }
+        public _BackChevron(Key key = null) : base(key: key) { }
 
         public override Widget build(BuildContext context) {
             TextStyle textStyle = DefaultTextStyle.of(context).style;
         ) : base(key: componentsKeys.navBarBoxKey) {
             D.assert(largeExpanded != null);
             D.assert(!largeExpanded.Value || this.largeTitleTextStyle != null);
+
             this.componentsKeys = componentsKeys;
             this.backgroundColor = backgroundColor;
             this.backButtonTextStyle = backButtonTextStyle;

Runtime/cupertino/scrollbar.cs

 using Unity.UIWidgets.widgets;
 
 namespace Unity.UIWidgets.cupertino {
-    public class CupertinoScrollbarUtils {
+    class CupertinoScrollbarUtils {
-        public static float _kScrollbarThickness = 2.5f;
-        public static float _kScrollbarMainAxisMargin = 4.0f;
-        public static float _kScrollbarCrossAxisMargin = 2.5f;
-        public static float _kScrollbarMinLength = 36.0f;
-        public static float _kScrollbarMinOverscrollLength = 8.0f;
+        public const float _kScrollbarThickness = 2.5f;
+        public const float _kScrollbarMainAxisMargin = 4.0f;
+        public const float _kScrollbarCrossAxisMargin = 2.5f;
+        public const float _kScrollbarMinLength = 36.0f;
+        public const float _kScrollbarMinOverscrollLength = 8.0f;
         public static Radius _kScrollbarRadius = Radius.circular(1.25f);
         public static TimeSpan _kScrollbarTimeToFade = new TimeSpan(0, 0, 0, 0, 50);
         public static TimeSpan _kScrollbarFadeDuration = new TimeSpan(0, 0, 0, 0, 250);
 
         public readonly Widget child;
 
-        public override State createState() => new _CupertinoScrollbarState();
+        public override State createState() {
+            return new _CupertinoScrollbarState();
+        }
     }
 
     class _CupertinoScrollbarState : TickerProviderStateMixin<CupertinoScrollbar> {

Runtime/cupertino/switch.cs

 
 
         public override RenderObject createRenderObject(BuildContext context) {
-            return (RenderObject) new _RenderCupertinoSwitch(
+            return new _RenderCupertinoSwitch(
                 value: this.value,
                 activeColor: this.activeColor,
                 onChanged: this.onChanged,
             Color activeColor,
             TextDirection textDirection,
             TickerProvider vsync,
-            ValueChanged<bool> onChanged,
+            ValueChanged<bool> onChanged = null,
             DragStartBehavior dragStartBehavior = DragStartBehavior.start
         ) : base(additionalConstraints: BoxConstraints.tightFor(
             width: CupertinoSwitchUtils._kSwitchWidth,
                 }
 
                 this._value = value;
+                // this.markNeedsSemanticsUpdate();
                 this._position.curve = Curves.ease;
                 this._position.reverseCurve = Curves.ease.flipped;
                 if (value) {
         }
 
         bool _value;
-
 
         public TickerProvider vsync {
             get { return this._vsync; }
                 this._position.curve = null;
                 this._position.reverseCurve = null;
                 float delta = details.primaryDelta / CupertinoSwitchUtils._kTrackInnerLength ?? 0f;
-                switch (this.textDirection) {
-                    case TextDirection.rtl:
-                        this._positionController.setValue(this._positionController.value - delta);
-                        break;
-                    case TextDirection.ltr:
-                        this._positionController.setValue(this._positionController.value + delta);
-                        break;
-                }
+                
+                this._positionController.setValue(this._positionController.value + delta);
+                
+                // switch (this.textDirection) {
+                //     case TextDirection.rtl:
+                //         this._positionController.setValue(this._positionController.value - delta);
+                //         break;
+                //     case TextDirection.ltr:
+                //         this._positionController.setValue(this._positionController.value + delta);
+                //         break;
+                // }
             }
         }
 

Runtime/ui/text.cs

 
         public readonly int index;
 
-        public static readonly FontWeight w100 = new FontWeight(0);
-        public static readonly FontWeight w200 = new FontWeight(1);
-        public static readonly FontWeight w300 = new FontWeight(2);
-        public static readonly FontWeight w400 = new FontWeight(3);
-        public static readonly FontWeight w500 = new FontWeight(4);
-        public static readonly FontWeight w600 = new FontWeight(5);
-
-        public static readonly FontWeight w700 = new FontWeight(6);
-
-        public static readonly FontWeight w800 = new FontWeight(7);
-
-        public static readonly FontWeight w900 = new FontWeight(8);
-
-
+        public static readonly FontWeight w100 = new FontWeight(0); // Ultralight
+        public static readonly FontWeight w200 = new FontWeight(1); // Thin
+        public static readonly FontWeight w300 = new FontWeight(2); // Light
+        public static readonly FontWeight w400 = new FontWeight(3); // Regular
+        public static readonly FontWeight w500 = new FontWeight(4); // Medium
+        public static readonly FontWeight w600 = new FontWeight(5); // Semibold
+        public static readonly FontWeight w700 = new FontWeight(6); // Bold
+        public static readonly FontWeight w800 = new FontWeight(7); // Heavy
+        public static readonly FontWeight w900 = new FontWeight(8); // Black
+        
-
 
         public static readonly FontWeight bold = w700;
 

Samples/UIWidgetsGallery/Editor/GalleryMainEditor.cs

         protected override void OnEnable() {
             FontManager.instance.addFont(Resources.Load<Font>("MaterialIcons-Regular"), "Material Icons");
             FontManager.instance.addFont(Resources.Load<Font>("GalleryIcons"), "GalleryIcons");
+            
+            FontManager.instance.addFont(Resources.Load<Font>("CupertinoIcons"), "CupertinoIcons");
+            FontManager.instance.addFont(Resources.Load<Font>(path: "SF-Pro-Text-Regular"), ".SF Pro Text", FontWeight.w400);
+            FontManager.instance.addFont(Resources.Load<Font>(path: "SF-Pro-Text-Semibold"), ".SF Pro Text", FontWeight.w600);
+            FontManager.instance.addFont(Resources.Load<Font>(path: "SF-Pro-Text-Bold"), ".SF Pro Text", FontWeight.w700);
             base.OnEnable();
         }
     }

Samples/UIWidgetsGallery/GalleryMain.cs

             FontManager.instance.addFont(Resources.Load<Font>("MaterialIcons-Regular"), "Material Icons");
             FontManager.instance.addFont(Resources.Load<Font>("GalleryIcons"), "GalleryIcons");
             
+            FontManager.instance.addFont(Resources.Load<Font>("CupertinoIcons"), "CupertinoIcons");
+            FontManager.instance.addFont(Resources.Load<Font>(path: "SF-Pro-Text-Regular"), ".SF Pro Text", FontWeight.w400);
+            FontManager.instance.addFont(Resources.Load<Font>(path: "SF-Pro-Text-Semibold"), ".SF Pro Text", FontWeight.w600);
+            FontManager.instance.addFont(Resources.Load<Font>(path: "SF-Pro-Text-Bold"), ".SF Pro Text", FontWeight.w700);
+            
             base.OnEnable();
         }
     }

Samples/UIWidgetsGallery/gallery/demo.cs

 using System.Collections.Generic;
 using System.Linq;
+using Unity.UIWidgets.cupertino;
 using Unity.UIWidgets.foundation;
 using Unity.UIWidgets.material;
 using Unity.UIWidgets.painting;
                    && other.description == this.description
                    && other.documentationUrl == this.documentationUrl;
         }
-        
+
         public override bool Equals(object obj) {
             if (ReferenceEquals(null, obj)) {
                 return false;
     }
 
     public class FullScreenCodeDialogState : State<FullScreenCodeDialog> {
-        public FullScreenCodeDialogState() {
-        }
+        public FullScreenCodeDialogState() { }
 
         string _exampleCode;
 
             return new IconButton(
                 icon: new Icon(Icons.library_books),
                 tooltip: "API documentation",
+                onPressed: () => Application.OpenURL(this.documentationUrl)
+            );
+        }
+    }
+
+    class CupertinoDemoDocumentationButton : StatelessWidget {
+        public CupertinoDemoDocumentationButton(
+            string routeName,
+            Key key = null
+        ) : base(key: key) {
+            this.documentationUrl = DemoUtils.kDemoDocumentationUrl[routeName];
+
+            D.assert(
+                DemoUtils.kDemoDocumentationUrl[routeName] != null,
+                () => $"A documentation URL was not specified for demo route {routeName} in kAllGalleryDemos"
+            );
+        }
+
+        public readonly string documentationUrl;
+
+        public override Widget build(BuildContext context) {
+            return new CupertinoButton(
+                padding: EdgeInsets.zero,
+                child: new Icon(CupertinoIcons.book),
                 onPressed: () => Application.OpenURL(this.documentationUrl)
             );
         }

Samples/UIWidgetsGallery/gallery/demos.cs

 using System.Collections.Generic;
 using System.Linq;
 using Unity.UIWidgets.foundation;
-using Unity.UIWidgets.material;
 using Unity.UIWidgets.widgets;
 
 namespace UIWidgetsGallery.gallery {
             if (ReferenceEquals(null, other)) {
                 return false;
             }
+
+
             return string.Equals(this.name, other.name) && Equals(this.icon, other.icon);
         }
 
             }
+
+
+
             return this.Equals((GalleryDemoCategory) obj);
         }
 
         public override string ToString() {
             return $"{this.GetType()}({this.title} {this.routeName})";
         }
-
     }
 
     public static partial class DemoUtils {
                     title: "Shrine",
                     subtitle: "Basic shopping app",
                     icon: GalleryIcons.shrine,
-                    category: DemoUtils._kDemos,
+                    category: _kDemos,
                     routeName: ShrineDemo.routeName,
                     buildRoute: (BuildContext context) => new ShrineDemo()
                 ),
                     icon: GalleryIcons.account_box,
-                    category: DemoUtils._kDemos,
+                    category: _kDemos,
                     routeName: ContactsDemo.routeName,
                     buildRoute: (BuildContext context) => new ContactsDemo()
                 ),
                     icon: GalleryIcons.animation,
-                    category: DemoUtils._kDemos,
+                    category: _kDemos,
                     routeName: AnimationDemo.routeName,
                     buildRoute: (BuildContext context) => new AnimationDemo()
                 ),
                     title: "Colors",
                     subtitle: "All of the predefined colors",
                     icon: GalleryIcons.colors,
-                    category: DemoUtils._kStyle,
+                    category: _kStyle,
                     routeName: ColorsDemo.routeName,
                     buildRoute: (BuildContext context) => new ColorsDemo()
                 ),
                     icon: GalleryIcons.custom_typography,
-                    category: DemoUtils._kStyle,
+                    category: _kStyle,
                     routeName: TypographyDemo.routeName,
                     buildRoute: (BuildContext context) => new TypographyDemo()
                 ),
                     title: "Backdrop",
                     subtitle: "Select a front layer from back layer",
                     icon: GalleryIcons.backdrop,
-                    category: DemoUtils._kMaterialComponents,
+                    category: _kMaterialComponents,
                     routeName: BackdropDemo.routeName,
                     buildRoute: (BuildContext context) => new BackdropDemo()
                 ),
                     icon: GalleryIcons.bottom_app_bar,
-                    category: DemoUtils._kMaterialComponents,
+                    category: _kMaterialComponents,
                     routeName: BottomAppBarDemo.routeName,
                     documentationUrl: "https://docs.flutter.io/flutter/material/BottomAppBar-class.html",
                     buildRoute: (BuildContext context) => new BottomAppBarDemo()
                     subtitle: "Bottom navigation with cross-fading views",
                     icon: GalleryIcons.bottom_navigation,
-                    category: DemoUtils._kMaterialComponents,
+                    category: _kMaterialComponents,
                     routeName: BottomNavigationDemo.routeName,
                     documentationUrl: "https://docs.flutter.io/flutter/material/BottomNavigationBar-class.html",
                     buildRoute: (BuildContext context) => new BottomNavigationDemo()
                     title: "Buttons",
                     subtitle: "Flat, raised, dropdown, and more",
                     icon: GalleryIcons.generic_buttons,
-                    category: DemoUtils._kMaterialComponents,
+                    category: _kMaterialComponents,
                     routeName: ButtonsDemo.routeName,
                     buildRoute: (BuildContext context) => new ButtonsDemo()
                 ),
                     title: "Cards",
                     subtitle: "Baseline cards with rounded corners",
                     icon: GalleryIcons.cards,
-                    category: DemoUtils._kMaterialComponents,
+                    category: _kMaterialComponents,
                     routeName: CardsDemo.routeName,
                     documentationUrl: "https://docs.flutter.io/flutter/material/Card-class.html",
                     buildRoute: (BuildContext context) => new CardsDemo()
                     documentationUrl: "https://docs.flutter.io/flutter/material/Chip-class.html",
                     buildRoute: (BuildContext context) => new ChipDemo()
                 ),
-//                new GalleryDemo(
-//                    title: "Data tables",
-//                    subtitle: "Rows and columns",
-//                    icon: GalleryIcons.data_table,
-//                    category: GalleryDemoCategory._kMaterialComponents,
-//                    routeName: DataTableDemo.routeName,
-//                    documentationUrl: "https://docs.flutter.io/flutter/material/PaginatedDataTable-class.html",
-//                    buildRoute: (BuildContext context) => DataTableDemo()
-//                ),
-//                new GalleryDemo(
-//                    title: "Dialogs",
-//                    subtitle: "Simple, alert, and fullscreen",
-//                    icon: GalleryIcons.dialogs,
-//                    category: GalleryDemoCategory._kMaterialComponents,
-//                    routeName: DialogDemo.routeName,
-//                    documentationUrl: "https://docs.flutter.io/flutter/material/showDialog.html",
-//                    buildRoute: (BuildContext context) => DialogDemo()
-//                ),
-//                new GalleryDemo(
-//                    title: "Elevations",
-//                    subtitle: "Shadow values on cards",
-//                    // TODO(larche): Change to custom icon for elevations when one exists.
-//                    icon: GalleryIcons.cupertino_progress,
-//                    category: GalleryDemoCategory._kMaterialComponents,
-//                    routeName: ElevationDemo.routeName,
-//                    documentationUrl: "https://docs.flutter.io/flutter/material/Material/elevation.html",
-//                    buildRoute: (BuildContext context) => ElevationDemo()
-//                ),
-//                new GalleryDemo(
-//                    title: "Expand/collapse list control",
-//                    subtitle: "A list with one sub-list level",
-//                    icon: GalleryIcons.expand_all,
-//                    category: GalleryDemoCategory._kMaterialComponents,
-//                    routeName: TwoLevelListDemo.routeName,
-//                    documentationUrl: "https://docs.flutter.io/flutter/material/ExpansionTile-class.html",
-//                    buildRoute: (BuildContext context) => TwoLevelListDemo()
-//                ),
-//                new GalleryDemo(
-//                    title: "Expansion panels",
-//                    subtitle: "List of expanding panels",
-//                    icon: GalleryIcons.expand_all,
-//                    category: GalleryDemoCategory._kMaterialComponents,
-//                    routeName: ExpansionPanelsDemo.routeName,
-//                    documentationUrl: "https://docs.flutter.io/flutter/material/ExpansionPanel-class.html",
-//                    buildRoute: (BuildContext context) => ExpansionPanelsDemo()
-//                ),
-//                new GalleryDemo(
-//                    title: "Grid",
-//                    subtitle: "Row and column layout",
-//                    icon: GalleryIcons.grid_on,
-//                    category: GalleryDemoCategory._kMaterialComponents,
-//                    routeName: GridListDemo.routeName,
-//                    documentationUrl: "https://docs.flutter.io/flutter/widgets/GridView-class.html",
-//                    buildRoute: (BuildContext context) => new GridListDemo()
-//                ),
-//                new GalleryDemo(
-//                    title: "Icons",
-//                    subtitle: "Enabled and disabled icons with opacity",
-//                    icon: GalleryIcons.sentiment_very_satisfied,
-//                    category: GalleryDemoCategory._kMaterialComponents,
-//                    routeName: IconsDemo.routeName,
-//                    documentationUrl: "https://docs.flutter.io/flutter/material/IconButton-class.html",
-//                    buildRoute: (BuildContext context) => IconsDemo()
-//                ),
-//                new GalleryDemo(
-//                    title: "Lists",
-//                    subtitle: "Scrolling list layouts",
-//                    icon: GalleryIcons.list_alt,
-//                    category: GalleryDemoCategory._kMaterialComponents,
-//                    routeName: ListDemo.routeName,
-//                    documentationUrl: "https://docs.flutter.io/flutter/material/ListTile-class.html",
-//                    buildRoute: (BuildContext context) => new ListDemo()
-//                ),
-//                new GalleryDemo(
-//                    title: "Lists: leave-behind list items",
-//                    subtitle: "List items with hidden actions",
-//                    icon: GalleryIcons.lists_leave_behind,
-//                    category: GalleryDemoCategory._kMaterialComponents,
-//                    routeName: LeaveBehindDemo.routeName,
-//                    documentationUrl: "https://docs.flutter.io/flutter/widgets/Dismissible-class.html",
-//                    buildRoute: (BuildContext context) => new LeaveBehindDemo()
-//                ),
-//                new GalleryDemo(
-//                    title: "Lists: reorderable",
-//                    subtitle: "Reorderable lists",
-//                    icon: GalleryIcons.list_alt,
-//                    category: GalleryDemoCategory._kMaterialComponents,
-//                    routeName: ReorderableListDemo.routeName,
-//                    documentationUrl: "https://docs.flutter.io/flutter/material/ReorderableListView-class.html",
-//                    buildRoute: (BuildContext context) => new ReorderableListDemo()
-//                ),
-//                new GalleryDemo(
-//                    title: "Menus",
-//                    subtitle: "Menu buttons and simple menus",
-//                    icon: GalleryIcons.more_vert,
-//                    category: GalleryDemoCategory._kMaterialComponents,
-//                    routeName: MenuDemo.routeName,
-//                    documentationUrl: "https://docs.flutter.io/flutter/material/PopupMenuButton-class.html",
-//                    buildRoute: (BuildContext context) => new MenuDemo()
-//                ),
-//                new GalleryDemo(
-//                    title: "Navigation drawer",
-//                    subtitle: "Navigation drawer with standard header",
-//                    icon: GalleryIcons.menu,
-//                    category: GalleryDemoCategory._kMaterialComponents,
-//                    routeName: DrawerDemo.routeName,
-//                    documentationUrl: "https://docs.flutter.io/flutter/material/Drawer-class.html",
-//                    buildRoute: (BuildContext context) => DrawerDemo()
-//                ),
-//                new GalleryDemo(
-//                    title: "Pagination",
-//                    subtitle: "PageView with indicator",
-//                    icon: GalleryIcons.page_control,
-//                    category: GalleryDemoCategory._kMaterialComponents,
-//                    routeName: PageSelectorDemo.routeName,
-//                    documentationUrl: "https://docs.flutter.io/flutter/material/TabBarView-class.html",
-//                    buildRoute: (BuildContext context) => PageSelectorDemo()
-//                ),
-//                new GalleryDemo(
-//                    title: "Pickers",
-//                    subtitle: "Date and time selection widgets",
-//                    icon: GalleryIcons.@event,
-//                    category: GalleryDemoCategory._kMaterialComponents,
-//                    routeName: DateAndTimePickerDemo.routeName,
-//                    documentationUrl: "https://docs.flutter.io/flutter/material/showDatePicker.html",
-//                    buildRoute: (BuildContext context) => DateAndTimePickerDemo()
-//                ),
-//                new GalleryDemo(
-//                    title: "Progress indicators",
-//                    subtitle: "Linear, circular, indeterminate",
-//                    icon: GalleryIcons.progress_activity,
-//                    category: GalleryDemoCategory._kMaterialComponents,
-//                    routeName: ProgressIndicatorDemo.routeName,
-//                    documentationUrl: "https://docs.flutter.io/flutter/material/LinearProgressIndicator-class.html",
-//                    buildRoute: (BuildContext context) => ProgressIndicatorDemo()
-//                ),
-//                new GalleryDemo(
-//                    title: "Pull to refresh",
-//                    subtitle: "Refresh indicators",
-//                    icon: GalleryIcons.refresh,
-//                    category: GalleryDemoCategory._kMaterialComponents,
-//                    routeName: OverscrollDemo.routeName,
-//                    documentationUrl: "https://docs.flutter.io/flutter/material/RefreshIndicator-class.html",
-//                    buildRoute: (BuildContext context) => OverscrollDemo()
-//                ),
-//                new GalleryDemo(
-//                    title: "Search",
-//                    subtitle: "Expandable search",
-//                    icon: Icons.search,
-//                    category: GalleryDemoCategory._kMaterialComponents,
-//                    routeName: SearchDemo.routeName,
-//                    documentationUrl: "https://docs.flutter.io/flutter/material/showSearch.html",
-//                    buildRoute: (BuildContext context) => SearchDemo()
-//                ),
-//                new GalleryDemo(
-//                    title: "Selection controls",
-//                    subtitle: "Checkboxes, radio buttons, and switches",
-//                    icon: GalleryIcons.check_box,
-//                    category: GalleryDemoCategory._kMaterialComponents,
-//                    routeName: SelectionControlsDemo.routeName,
-//                    buildRoute: (BuildContext context) => SelectionControlsDemo()
-//                ),
-//                new GalleryDemo(
-//                    title: "Sliders",
-//                    subtitle: "Widgets for selecting a value by swiping",
-//                    icon: GalleryIcons.sliders,
-//                    category: GalleryDemoCategory._kMaterialComponents,
-//                    routeName: SliderDemo.routeName,
-//                    documentationUrl: "https://docs.flutter.io/flutter/material/Slider-class.html",
-//                    buildRoute: (BuildContext context) => SliderDemo()
-//                ),
-//                new GalleryDemo(
-//                    title: "Snackbar",
-//                    subtitle: "Temporary messaging",
-//                    icon: GalleryIcons.snackbar,
-//                    category: GalleryDemoCategory._kMaterialComponents,
-//                    routeName: SnackBarDemo.routeName,
-//                    documentationUrl: "https://docs.flutter.io/flutter/material/ScaffoldState/showSnackBar.html",
-//                    buildRoute: (BuildContext context) => SnackBarDemo()
-//                ),
-//                new GalleryDemo(
-//                    title: "Tabs",
-//                    subtitle: "Tabs with independently scrollable views",
-//                    icon: GalleryIcons.tabs,
-//                    category: GalleryDemoCategory._kMaterialComponents,
-//                    routeName: TabsDemo.routeName,
-//                    documentationUrl: "https://docs.flutter.io/flutter/material/TabBarView-class.html",
-//                    buildRoute: (BuildContext context) => TabsDemo()
-//                ),
-//                new GalleryDemo(
-//                    title: "Tabs: Scrolling",
-//                    subtitle: "Tab bar that scrolls",
-//                    category: GalleryDemoCategory._kMaterialComponents,
-//                    icon: GalleryIcons.tabs,
-//                    routeName: ScrollableTabsDemo.routeName,
-//                    documentationUrl: "https://docs.flutter.io/flutter/material/TabBar-class.html",
-//                    buildRoute: (BuildContext context) => ScrollableTabsDemo()
-//                ),
-//                new GalleryDemo(
-//                    title: "Text fields",
-//                    subtitle: "Single line of editable text and numbers",
-//                    icon: GalleryIcons.text_fields_alt,
-//                    category: GalleryDemoCategory._kMaterialComponents,
-//                    routeName: TextFormFieldDemo.routeName,
-//                    documentationUrl: "https://docs.flutter.io/flutter/material/TextFormField-class.html",
-//                    buildRoute: (BuildContext context) =>  const TextFormFieldDemo()
-//                ),
-//                new GalleryDemo(
-//                    title: "Tooltips",
-//                    subtitle: "Short message displayed on long-press",
-//                    icon: GalleryIcons.tooltip,
-//                    category: GalleryDemoCategory._kMaterialComponents,
-//                    routeName: TooltipDemo.routeName,
-//                    documentationUrl: "https://docs.flutter.io/flutter/material/Tooltip-class.html",
-//                    buildRoute: (BuildContext context) => TooltipDemo()
-//                ),
-//
-//                // Cupertino Components
-//                new GalleryDemo(
-//                    title: "Activity Indicator",
-//                    icon: GalleryIcons.cupertino_progress,
-//                    category: GalleryDemoCategory._kCupertinoComponents,
-//                    routeName: CupertinoProgressIndicatorDemo.routeName,
-//                    documentationUrl: "https://docs.flutter.io/flutter/cupertino/CupertinoActivityIndicator-class.html",
-//                    buildRoute: (BuildContext context) => CupertinoProgressIndicatorDemo()
-//                ),
-//                new GalleryDemo(
-//                    title: "Alerts",
-//                    icon: GalleryIcons.dialogs,
-//                    category: GalleryDemoCategory._kCupertinoComponents,
-//                    routeName: CupertinoAlertDemo.routeName,
-//                    documentationUrl: "https://docs.flutter.io/flutter/cupertino/showCupertinoDialog.html",
-//                    buildRoute: (BuildContext context) => CupertinoAlertDemo()
-//                ),
-//                new GalleryDemo(
-//                    title: "Buttons",
-//                    icon: GalleryIcons.generic_buttons,
-//                    category: GalleryDemoCategory._kCupertinoComponents,
-//                    routeName: CupertinoButtonsDemo.routeName,
-//                    documentationUrl: "https://docs.flutter.io/flutter/cupertino/CupertinoButton-class.html",
-//                    buildRoute: (BuildContext context) => CupertinoButtonsDemo()
-//                ),
-//                new GalleryDemo(
-//                    title: "Navigation",
-//                    icon: GalleryIcons.bottom_navigation,
-//                    category: GalleryDemoCategory._kCupertinoComponents,
-//                    routeName: CupertinoNavigationDemo.routeName,
-//                    documentationUrl: "https://docs.flutter.io/flutter/cupertino/CupertinoTabScaffold-class.html",
-//                    buildRoute: (BuildContext context) => CupertinoNavigationDemo()
-//                ),
-//                new GalleryDemo(
-//                    title: "Pickers",
-//                    icon: GalleryIcons.@event,
-//                    category: GalleryDemoCategory._kCupertinoComponents,
-//                    routeName: CupertinoPickerDemo.routeName,
-//                    documentationUrl: "https://docs.flutter.io/flutter/cupertino/CupertinoPicker-class.html",
-//                    buildRoute: (BuildContext context) => CupertinoPickerDemo()
-//                ),
-//                new GalleryDemo(
-//                    title: "Pull to refresh",
-//                    icon: GalleryIcons.cupertino_pull_to_refresh,
-//                    category: _kCupertinoComponents,
-//                    routeName: CupertinoRefreshControlDemo.routeName,
-//                    documentationUrl:
-//                    "https://docs.flutter.io/flutter/cupertino/CupertinoSliverRefreshControl-class.html",
-//                    buildRoute: (BuildContext context) => CupertinoRefreshControlDemo()
-//                ),
-//                new GalleryDemo(
-//                    title: "Segmented Control",
-//                    icon: GalleryIcons.tabs,
-//                    category: GalleryDemoCategory._kCupertinoComponents,
-//                    routeName: CupertinoSegmentedControlDemo.routeName,
-//                    documentationUrl: "https://docs.flutter.io/flutter/cupertino/CupertinoSegmentedControl-class.html",
-//                    buildRoute: (BuildContext context) => CupertinoSegmentedControlDemo()
-//                ),
-//                new GalleryDemo(
-//                    title: "Sliders",
-//                    icon: GalleryIcons.sliders,
-//                    category: GalleryDemoCategory._kCupertinoComponents,
-//                    routeName: CupertinoSliderDemo.routeName,
-//                    documentationUrl: "https://docs.flutter.io/flutter/cupertino/CupertinoSlider-class.html",
-//                    buildRoute: (BuildContext context) => CupertinoSliderDemo()
-//                ),
-//                new GalleryDemo(
-//                    title: "Switches",
-//                    icon: GalleryIcons.cupertino_switch,
-//                    category: GalleryDemoCategory._kCupertinoComponents,
-//                    routeName: CupertinoSwitchDemo.routeName,
-//                    documentationUrl: "https://docs.flutter.io/flutter/cupertino/CupertinoSwitch-class.html",
-//                    buildRoute: (BuildContext context) => CupertinoSwitchDemo()
-//                ),
-//                new GalleryDemo(
-//                    title: "Text Fields",
-//                    icon: GalleryIcons.text_fields_alt,
-//                    category: GalleryDemoCategory._kCupertinoComponents,
-//                    routeName: CupertinoTextFieldDemo.routeName,
-//                    buildRoute: (BuildContext context) => CupertinoTextFieldDemo()
-//                ),
-//
-//                // Media
-//                new GalleryDemo(
-//                    title: "Animated images",
-//                    subtitle: "GIF and WebP animations",
-//                    icon: GalleryIcons.animation,
-//                    category: GalleryDemoCategory._kMedia,
-//                    routeName: ImagesDemo.routeName,
-//                    buildRoute: (BuildContext context) => ImagesDemo()
-//                ),
-//                new GalleryDemo(
-//                    title: "Video",
-//                    subtitle: "Video playback",
-//                    icon: GalleryIcons.drive_video,
-//                    category: GalleryDemoCategory._kMedia,
-//                    routeName: VideoDemo.routeName,
-//                    buildRoute: (BuildContext context) => new VideoDemo()
-//                ),
+                // new GalleryDemo(
+                //     title: "Data tables",
+                //     subtitle: "Rows and columns",
+                //     icon: GalleryIcons.data_table,
+                //     category: GalleryDemoCategory._kMaterialComponents,
+                //     routeName: DataTableDemo.routeName,
+                //     documentationUrl: "https://docs.flutter.io/flutter/material/PaginatedDataTable-class.html",
+                //     buildRoute: (BuildContext context) => DataTableDemo()
+                // ),
+                // new GalleryDemo(
+                //     title: "Dialogs",
+                //     subtitle: "Simple, alert, and fullscreen",
+                //     icon: GalleryIcons.dialogs,
+                //     category: GalleryDemoCategory._kMaterialComponents,
+                //     routeName: DialogDemo.routeName,
+                //     documentationUrl: "https://docs.flutter.io/flutter/material/showDialog.html",
+                //     buildRoute: (BuildContext context) => DialogDemo()
+                // ),
+                // new GalleryDemo(
+                //     title: "Elevations",
+                //     subtitle: "Shadow values on cards",
+                //     // TODO(larche): Change to custom icon for elevations when one exists.
+                //     icon: GalleryIcons.cupertino_progress,
+                //     category: GalleryDemoCategory._kMaterialComponents,
+                //     routeName: ElevationDemo.routeName,
+                //     documentationUrl: "https://docs.flutter.io/flutter/material/Material/elevation.html",
+                //     buildRoute: (BuildContext context) => ElevationDemo()
+                // ),
+                // new GalleryDemo(
+                //     title: "Expand/collapse list control",
+                //     subtitle: "A list with one sub-list level",
+                //     icon: GalleryIcons.expand_all,
+                //     category: GalleryDemoCategory._kMaterialComponents,
+                //     routeName: TwoLevelListDemo.routeName,
+                //     documentationUrl: "https://docs.flutter.io/flutter/material/ExpansionTile-class.html",
+                //     buildRoute: (BuildContext context) => TwoLevelListDemo()
+                // ),
+                // new GalleryDemo(
+                //     title: "Expansion panels",
+                //     subtitle: "List of expanding panels",
+                //     icon: GalleryIcons.expand_all,
+                //     category: GalleryDemoCategory._kMaterialComponents,
+                //     routeName: ExpansionPanelsDemo.routeName,
+                //     documentationUrl: "https://docs.flutter.io/flutter/material/ExpansionPanel-class.html",
+                //     buildRoute: (BuildContext context) => ExpansionPanelsDemo()
+                // ),
+                // new GalleryDemo(
+                //     title: "Grid",
+                //     subtitle: "Row and column layout",
+                //     icon: GalleryIcons.grid_on,
+                //     category: GalleryDemoCategory._kMaterialComponents,
+                //     routeName: GridListDemo.routeName,
+                //     documentationUrl: "https://docs.flutter.io/flutter/widgets/GridView-class.html",
+                //     buildRoute: (BuildContext context) => new GridListDemo()
+                // ),
+                // new GalleryDemo(
+                //     title: "Icons",
+                //     subtitle: "Enabled and disabled icons with opacity",
+                //     icon: GalleryIcons.sentiment_very_satisfied,
+                //     category: GalleryDemoCategory._kMaterialComponents,
+                //     routeName: IconsDemo.routeName,
+                //     documentationUrl: "https://docs.flutter.io/flutter/material/IconButton-class.html",
+                //     buildRoute: (BuildContext context) => IconsDemo()
+                // ),
+                // new GalleryDemo(
+                //     title: "Lists",
+                //     subtitle: "Scrolling list layouts",
+                //     icon: GalleryIcons.list_alt,
+                //     category: GalleryDemoCategory._kMaterialComponents,
+                //     routeName: ListDemo.routeName,
+                //     documentationUrl: "https://docs.flutter.io/flutter/material/ListTile-class.html",
+                //     buildRoute: (BuildContext context) => new ListDemo()
+                // ),
+                // new GalleryDemo(
+                //     title: "Lists: leave-behind list items",
+                //     subtitle: "List items with hidden actions",
+                //     icon: GalleryIcons.lists_leave_behind,
+                //     category: GalleryDemoCategory._kMaterialComponents,
+                //     routeName: LeaveBehindDemo.routeName,
+                //     documentationUrl: "https://docs.flutter.io/flutter/widgets/Dismissible-class.html",
+                //     buildRoute: (BuildContext context) => new LeaveBehindDemo()
+                // ),
+                // new GalleryDemo(
+                //     title: "Lists: reorderable",
+                //     subtitle: "Reorderable lists",
+                //     icon: GalleryIcons.list_alt,
+                //     category: GalleryDemoCategory._kMaterialComponents,
+                //     routeName: ReorderableListDemo.routeName,
+                //     documentationUrl: "https://docs.flutter.io/flutter/material/ReorderableListView-class.html",
+                //     buildRoute: (BuildContext context) => new ReorderableListDemo()
+                // ),
+                // new GalleryDemo(
+                //     title: "Menus",
+                //     subtitle: "Menu buttons and simple menus",
+                //     icon: GalleryIcons.more_vert,
+                //     category: GalleryDemoCategory._kMaterialComponents,
+                //     routeName: MenuDemo.routeName,
+                //     documentationUrl: "https://docs.flutter.io/flutter/material/PopupMenuButton-class.html",
+                //     buildRoute: (BuildContext context) => new MenuDemo()
+                // ),
+                // new GalleryDemo(
+                //     title: "Navigation drawer",
+                //     subtitle: "Navigation drawer with standard header",
+                //     icon: GalleryIcons.menu,
+                //     category: GalleryDemoCategory._kMaterialComponents,
+                //     routeName: DrawerDemo.routeName,
+                //     documentationUrl: "https://docs.flutter.io/flutter/material/Drawer-class.html",
+                //     buildRoute: (BuildContext context) => DrawerDemo()
+                // ),
+                // new GalleryDemo(
+                //     title: "Pagination",
+                //     subtitle: "PageView with indicator",
+                //     icon: GalleryIcons.page_control,
+                //     category: GalleryDemoCategory._kMaterialComponents,
+                //     routeName: PageSelectorDemo.routeName,
+                //     documentationUrl: "https://docs.flutter.io/flutter/material/TabBarView-class.html",
+                //     buildRoute: (BuildContext context) => PageSelectorDemo()
+                // ),
+                // new GalleryDemo(
+                //     title: "Pickers",
+                //     subtitle: "Date and time selection widgets",
+                //     icon: GalleryIcons.@event,
+                //     category: GalleryDemoCategory._kMaterialComponents,
+                //     routeName: DateAndTimePickerDemo.routeName,
+                //     documentationUrl: "https://docs.flutter.io/flutter/material/showDatePicker.html",
+                //     buildRoute: (BuildContext context) => DateAndTimePickerDemo()
+                // ),
+                // new GalleryDemo(
+                //     title: "Progress indicators",
+                //     subtitle: "Linear, circular, indeterminate",
+                //     icon: GalleryIcons.progress_activity,
+                //     category: GalleryDemoCategory._kMaterialComponents,
+                //     routeName: ProgressIndicatorDemo.routeName,
+                //     documentationUrl: "https://docs.flutter.io/flutter/material/LinearProgressIndicator-class.html",
+                //     buildRoute: (BuildContext context) => ProgressIndicatorDemo()
+                // ),
+                // new GalleryDemo(
+                //     title: "Pull to refresh",
+                //     subtitle: "Refresh indicators",
+                //     icon: GalleryIcons.refresh,
+                //     category: GalleryDemoCategory._kMaterialComponents,
+                //     routeName: OverscrollDemo.routeName,
+                //     documentationUrl: "https://docs.flutter.io/flutter/material/RefreshIndicator-class.html",
+                //     buildRoute: (BuildContext context) => OverscrollDemo()
+                // ),
+                // new GalleryDemo(
+                //     title: "Search",
+                //     subtitle: "Expandable search",
+                //     icon: Icons.search,
+                //     category: GalleryDemoCategory._kMaterialComponents,
+                //     routeName: SearchDemo.routeName,
+                //     documentationUrl: "https://docs.flutter.io/flutter/material/showSearch.html",
+                //     buildRoute: (BuildContext context) => SearchDemo()
+                // ),
+                // new GalleryDemo(
+                //     title: "Selection controls",
+                //     subtitle: "Checkboxes, radio buttons, and switches",
+                //     icon: GalleryIcons.check_box,
+                //     category: GalleryDemoCategory._kMaterialComponents,
+                //     routeName: SelectionControlsDemo.routeName,
+                //     buildRoute: (BuildContext context) => SelectionControlsDemo()
+                // ),
+                // new GalleryDemo(
+                //     title: "Sliders",
+                //     subtitle: "Widgets for selecting a value by swiping",
+                //     icon: GalleryIcons.sliders,
+                //     category: GalleryDemoCategory._kMaterialComponents,
+                //     routeName: SliderDemo.routeName,
+                //     documentationUrl: "https://docs.flutter.io/flutter/material/Slider-class.html",
+                //     buildRoute: (BuildContext context) => SliderDemo()
+                // ),
+                // new GalleryDemo(
+                //     title: "Snackbar",
+                //     subtitle: "Temporary messaging",
+                //     icon: GalleryIcons.snackbar,
+                //     category: GalleryDemoCategory._kMaterialComponents,
+                //     routeName: SnackBarDemo.routeName,
+                //     documentationUrl: "https://docs.flutter.io/flutter/material/ScaffoldState/showSnackBar.html",
+                //     buildRoute: (BuildContext context) => SnackBarDemo()
+                // ),
+                // new GalleryDemo(
+                //     title: "Tabs",
+                //     subtitle: "Tabs with independently scrollable views",
+                //     icon: GalleryIcons.tabs,
+                //     category: GalleryDemoCategory._kMaterialComponents,
+                //     routeName: TabsDemo.routeName,
+                //     documentationUrl: "https://docs.flutter.io/flutter/material/TabBarView-class.html",
+                //     buildRoute: (BuildContext context) => TabsDemo()
+                // ),
+                // new GalleryDemo(
+                //     title: "Tabs: Scrolling",
+                //     subtitle: "Tab bar that scrolls",
+                //     category: GalleryDemoCategory._kMaterialComponents,
+                //     icon: GalleryIcons.tabs,
+                //     routeName: ScrollableTabsDemo.routeName,
+                //     documentationUrl: "https://docs.flutter.io/flutter/material/TabBar-class.html",
+                //     buildRoute: (BuildContext context) => ScrollableTabsDemo()
+                // ),
+                // new GalleryDemo(
+                //     title: "Text fields",
+                //     subtitle: "Single line of editable text and numbers",
+                //     icon: GalleryIcons.text_fields_alt,
+                //     category: GalleryDemoCategory._kMaterialComponents,
+                //     routeName: TextFormFieldDemo.routeName,
+                //     documentationUrl: "https://docs.flutter.io/flutter/material/TextFormField-class.html",
+                //     buildRoute: (BuildContext context) =>  const TextFormFieldDemo()
+                // ),
+                // new GalleryDemo(
+                //     title: "Tooltips",
+                //     subtitle: "Short message displayed on long-press",
+                //     icon: GalleryIcons.tooltip,
+                //     category: GalleryDemoCategory._kMaterialComponents,
+                //     routeName: TooltipDemo.routeName,
+                //     documentationUrl: "https://docs.flutter.io/flutter/material/Tooltip-class.html",
+                //     buildRoute: (BuildContext context) => TooltipDemo()
+                // ),
+                //
+                // Cupertino Components
+                // new GalleryDemo(
+                //     title: "Activity Indicator",
+                //     icon: GalleryIcons.cupertino_progress,
+                //     category: _kCupertinoComponents,
+                //     routeName: CupertinoProgressIndicatorDemo.routeName,
+                //     documentationUrl: "https://docs.flutter.io/flutter/cupertino/CupertinoActivityIndicator-class.html",
+                //     buildRoute: (BuildContext context) => CupertinoProgressIndicatorDemo()
+                // ),
+                // new GalleryDemo(
+                //     title: "Alerts",
+                //     icon: GalleryIcons.dialogs,
+                //     category: GalleryDemoCategory._kCupertinoComponents,
+                //     routeName: CupertinoAlertDemo.routeName,
+                //     documentationUrl: "https://docs.flutter.io/flutter/cupertino/showCupertinoDialog.html",
+                //     buildRoute: (BuildContext context) => CupertinoAlertDemo()
+                // ),
+                new GalleryDemo(
+                    title: "Buttons",
+                    icon: GalleryIcons.generic_buttons,
+                    category: _kCupertinoComponents,
+                    routeName: CupertinoButtonsDemo.routeName,
+                    documentationUrl: "https://docs.flutter.io/flutter/cupertino/CupertinoButton-class.html",
+                    buildRoute: (BuildContext context) => new CupertinoButtonsDemo()
+                ),
+                // new GalleryDemo(
+                //     title: "Navigation",
+                //     icon: GalleryIcons.bottom_navigation,
+                //     category: GalleryDemoCategory._kCupertinoComponents,
+                //     routeName: CupertinoNavigationDemo.routeName,
+                //     documentationUrl: "https://docs.flutter.io/flutter/cupertino/CupertinoTabScaffold-class.html",
+                //     buildRoute: (BuildContext context) => CupertinoNavigationDemo()
+                // ),
+                // new GalleryDemo(
+                //     title: "Pickers",
+                //     icon: GalleryIcons.@event,
+                //     category: GalleryDemoCategory._kCupertinoComponents,
+                //     routeName: CupertinoPickerDemo.routeName,
+                //     documentationUrl: "https://docs.flutter.io/flutter/cupertino/CupertinoPicker-class.html",
+                //     buildRoute: (BuildContext context) => CupertinoPickerDemo()
+                // ),
+                // new GalleryDemo(
+                //     title: "Pull to refresh",
+                //     icon: GalleryIcons.cupertino_pull_to_refresh,
+                //     category: _kCupertinoComponents,
+                //     routeName: CupertinoRefreshControlDemo.routeName,
+                //     documentationUrl:
+                //     "https://docs.flutter.io/flutter/cupertino/CupertinoSliverRefreshControl-class.html",
+                //     buildRoute: (BuildContext context) => CupertinoRefreshControlDemo()
+                // ),
+                // new GalleryDemo(
+                //     title: "Segmented Control",
+                //     icon: GalleryIcons.tabs,
+                //     category: GalleryDemoCategory._kCupertinoComponents,
+                //     routeName: CupertinoSegmentedControlDemo.routeName,
+                //     documentationUrl: "https://docs.flutter.io/flutter/cupertino/CupertinoSegmentedControl-class.html",
+                //     buildRoute: (BuildContext context) => CupertinoSegmentedControlDemo()
+                // ),
+                // new GalleryDemo(
+                //     title: "Sliders",
+                //     icon: GalleryIcons.sliders,
+                //     category: GalleryDemoCategory._kCupertinoComponents,
+                //     routeName: CupertinoSliderDemo.routeName,
+                //     documentationUrl: "https://docs.flutter.io/flutter/cupertino/CupertinoSlider-class.html",
+                //     buildRoute: (BuildContext context) => CupertinoSliderDemo()
+                // ),
+                // new GalleryDemo(
+                //     title: "Switches",
+                //     icon: GalleryIcons.cupertino_switch,
+                //     category: GalleryDemoCategory._kCupertinoComponents,
+                //     routeName: CupertinoSwitchDemo.routeName,
+                //     documentationUrl: "https://docs.flutter.io/flutter/cupertino/CupertinoSwitch-class.html",
+                //     buildRoute: (BuildContext context) => CupertinoSwitchDemo()
+                // ),
+                // new GalleryDemo(
+                //     title: "Text Fields",
+                //     icon: GalleryIcons.text_fields_alt,
+                //     category: GalleryDemoCategory._kCupertinoComponents,
+                //     routeName: CupertinoTextFieldDemo.routeName,
+                //     buildRoute: (BuildContext context) => CupertinoTextFieldDemo()
+                // ),
+                //
+                // // Media
+                // new GalleryDemo(
+                //     title: "Animated images",
+                //     subtitle: "GIF and WebP animations",
+                //     icon: GalleryIcons.animation,
+                //     category: GalleryDemoCategory._kMedia,
+                //     routeName: ImagesDemo.routeName,
+                //     buildRoute: (BuildContext context) => ImagesDemo()
+                // ),
+                // new GalleryDemo(
+                //     title: "Video",
+                //     subtitle: "Video playback",
+                //     icon: GalleryIcons.drive_video,
+                //     category: GalleryDemoCategory._kMedia,
+                //     routeName: VideoDemo.routeName,
+                //     buildRoute: (BuildContext context) => new VideoDemo()
+                // ),
-//                galleryDemos.Insert(0,
-//                    new GalleryDemo(
-//                        title: "Pesto",
-//                        subtitle: "Simple recipe browser",
-//                        icon: Icons.adjust,
-//                        category: GalleryDemoCategory._kDemos,
-//                        routeName: PestoDemo.routeName,
-//                        buildRoute: (BuildContext context) => new PestoDemo()
-//                    )
-//                );
+                // galleryDemos.Insert(0,
+                //     new GalleryDemo(
+                //         title: "Pesto",
+                //         subtitle: "Simple recipe browser",
+                //         icon: Icons.adjust,
+                //         category: GalleryDemoCategory._kDemos,
+                //         routeName: PestoDemo.routeName,
+                //         buildRoute: (BuildContext context) => new PestoDemo()
+                //     )
+                // );
                 return true;
             });
 
                 demo => demo.documentationUrl
             );
     }
-}
+}

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Samples/UIWidgetsGallery/demo/cupertino/cupertino_buttons_demo.cs

+using System.Collections.Generic;
+using Unity.UIWidgets.cupertino;
+using Unity.UIWidgets.material;
+using Unity.UIWidgets.painting;
+using Unity.UIWidgets.rendering;
+using Unity.UIWidgets.widgets;
+
+namespace UIWidgetsGallery.gallery {
+    class CupertinoButtonsDemo : StatefulWidget {
+        public static string routeName = "/cupertino/buttons";
+        public override State createState() => new _CupertinoButtonDemoState();
+    }
+
+    class _CupertinoButtonDemoState : State<CupertinoButtonsDemo> {
+        int _pressedCount = 0;
+
+
+        public override Widget build(BuildContext context) {
+            return new CupertinoPageScaffold(
+                navigationBar: new CupertinoNavigationBar(
+                    middle: new Text("Buttons"),
+                    previousPageTitle: "Cupertino",
+                    trailing: new CupertinoDemoDocumentationButton(CupertinoButtonsDemo.routeName)
+                ),
+                child: new DefaultTextStyle(
+                    style: CupertinoTheme.of(context).textTheme.textStyle,
+                    child: new SafeArea(
+                        child: new Column(
+                            children: new List<Widget> {
+                                new Padding(
+                                    padding: EdgeInsets.all(16.0f),
+                                    child: new Text(
+                                        "iOS themed buttons are flat. They can have borders or backgrounds but only when necessary."
+                                    )
+                                ),
+                                new Expanded(
+                                    child: new Column(
+                                        mainAxisAlignment: MainAxisAlignment.center,
+                                        children: new List<Widget> {
+                                            new Text(this._pressedCount > 0
+                                                ? $"Button pressed {this._pressedCount} time" +
+                                                  (this._pressedCount == 1 ? "" : "s")
+                                                : " "),
+                                            new Padding(padding: EdgeInsets.all(12.0f)),
+                                            new Align(
+                                                alignment: new Alignment(0.0f, -0.2f),
+                                                child:
+                                                new Row(
+                                                    mainAxisSize: MainAxisSize.min,
+                                                    children: new List<Widget> {
+                                                        new CupertinoButton(
+                                                            child: new Text("Cupertino Button"),
+                                                            onPressed:
+                                                            () => { this.setState(() => { this._pressedCount += 1; }); }
+                                                        ),
+                                                        new CupertinoButton(
+                                                            child: new Text("Disabled"),
+                                                            onPressed: null
+                                                        )
+                                                    }
+                                                )
+                                            ),
+                                            new Padding(padding: EdgeInsets.all(12.0f)),
+                                            CupertinoButton.filled(
+                                                child: new Text("With Background"),
+                                                onPressed:
+                                                () => { this.setState(() => { this._pressedCount += 1; }); }
+                                            ),
+                                            new Padding(padding: EdgeInsets.all(12.0f)),
+                                            CupertinoButton.filled(
+                                                child: new Text("Disabled"),
+                                                onPressed: null
+                                            ),
+                                        }
+                                    )
+                                )
+                            }
+                        )
+                    )
+                )
+            );
+        }
+    }
+}

Samples/UIWidgetsGallery/demo/cupertino/cupertino_buttons_demo.cs.meta

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