com.unity.uiwidgets/Samples/UIWidgetsSamples_2019_4/Assets/UIWidgetsGallery/gallery/demos.cs

using System.Collections.Generic;
using System.Linq;
using UIWidgetsGallery.demo;
using UIWidgetsGallery.demo.material;
using Unity.UIWidgets.external;
using Unity.UIWidgets.foundation;
using Unity.UIWidgets.material;
using Unity.UIWidgets.widgets;

namespace UIWidgetsGallery.gallery
{
    public class GalleryDemoCategory
    {
        public GalleryDemoCategory(
            string name,
            IconData icon)
        {
            this.name = name;
            this.icon = icon;
        }

        public readonly string name;
        public readonly IconData icon;

        public bool Equals(GalleryDemoCategory other)
        {
            if (ReferenceEquals(this, other)) return true;

            if (ReferenceEquals(other, null)) return false;

            return icon.Equals(other.icon) && name == other.name;
        }

        public override bool Equals(object obj)
        {
            if (ReferenceEquals(this, obj)) return true;

            if (ReferenceEquals(obj, null)) return false;

            if (obj.GetType() != GetType()) return false;

            return Equals((GalleryDemoCategory) obj);
        }

        public static bool operator ==(GalleryDemoCategory left, GalleryDemoCategory right)
        {
            return Equals(left, right);
        }

        public static bool operator !=(GalleryDemoCategory left, GalleryDemoCategory right)
        {
            return !Equals(left, right);
        }

        public override int GetHashCode()
        {
            unchecked
            {
                return ((icon?.GetHashCode() ?? 0) * 397) ^ (name?.GetHashCode() ?? 0);
            }
        }

        public override string ToString()
        {
            return $"{GetType()}{name}";
        }

        public static readonly GalleryDemoCategory _kDemos = new GalleryDemoCategory(
            name: "Studies",
            icon: GalleryIcons.animation
        );

        public static readonly GalleryDemoCategory _kStyle = new GalleryDemoCategory(
            name: "Style",
            icon: GalleryIcons.custom_typography
        );

        public static readonly GalleryDemoCategory _kMaterialComponents = new GalleryDemoCategory(
            name: "Material",
            icon: GalleryIcons.category_mdc
        );

        public static readonly GalleryDemoCategory _kCupertinoComponents = new GalleryDemoCategory(
            name: "Cupertino",
            icon: GalleryIcons.phone_iphone
        );

        public static readonly GalleryDemoCategory _kMedia = new GalleryDemoCategory(
            name: "Media",
            icon: GalleryIcons.drive_video
        );
    }

    internal class GalleryDemo
    {
        public GalleryDemo(
            string title = null,
            IconData icon = null,
            string subtitle = null,
            GalleryDemoCategory category = null,
            string routeName = null,
            string documentationUrl = null,
            WidgetBuilder buildRoute = null
        )
        {
            D.assert(title != null);
            D.assert(category != null);
            D.assert(routeName != null);
            D.assert(buildRoute != null);

            this.title = title;
            this.icon = icon;
            this.subtitle = subtitle;
            this.category = category;
            this.routeName = routeName;
            this.documentationUrl = documentationUrl;
            this.buildRoute = buildRoute;
        }

        public readonly string title;
        public readonly IconData icon;
        public readonly string subtitle;
        public readonly GalleryDemoCategory category;
        public readonly string routeName;
        public readonly WidgetBuilder buildRoute;
        public readonly string documentationUrl;

        public override string ToString()
        {
            return $"{GetType()}({title} {routeName})";
        }

        public static List<GalleryDemo> _buildGalleryDemos()
        {
            List<GalleryDemo> galleryDemos = new List<GalleryDemo>()
            {
                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) => new 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) => new 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) => 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) => new CupertinoNavigationDemo()
                ),
                new GalleryDemo(
                    title: "Pickers",
                    icon: GalleryIcons.cards,
                    category: GalleryDemoCategory._kCupertinoComponents,
                    routeName: CupertinoPickerDemo.routeName,
                    documentationUrl: "https://docs.flutter.io/flutter/cupertino/CupertinoPicker-class.html",
                    buildRoute: (BuildContext context) => new CupertinoPickerDemo()
                ),
                new GalleryDemo(
                    title: "Pull to refresh",
                    icon: GalleryIcons.cupertino_pull_to_refresh,
                    category: GalleryDemoCategory._kCupertinoComponents,
                    routeName: CupertinoRefreshControlDemo.routeName,
                    documentationUrl:
                    "https://docs.flutter.io/flutter/cupertino/CupertinoSliverRefreshControl-class.html",
                    buildRoute: (BuildContext context) => new 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) => new 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) => new 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) => new CupertinoSwitchDemo()
                ),
                new GalleryDemo(
                    title: "Text Fields",
                    icon: GalleryIcons.text_fields_alt,
                    category: GalleryDemoCategory._kCupertinoComponents,
                    routeName: CupertinoTextFieldDemo.routeName,
                    buildRoute: (BuildContext context) => new CupertinoTextFieldDemo()
                ),
                new GalleryDemo(
                    title: "Shrine",
                    subtitle: "Basic shopping app",
                    icon: GalleryIcons.shrine,
                    category: GalleryDemoCategory._kDemos,
                    routeName: ShrineDemo.routeName,
                    buildRoute: (BuildContext context) => new ShrineDemo()
                ),
                new GalleryDemo(
                    title: "Backdrop",
                    subtitle: $"Select a front layer from back layer",
                    icon: GalleryIcons.backdrop,
                    category: GalleryDemoCategory._kMaterialComponents,
                    routeName: BackdropDemo.routeName,
                    buildRoute: (BuildContext context) => new BackdropDemo()
                ),
                new GalleryDemo(
                    title: "Banner",
                    subtitle: "Displaying a banner within a list",
                    icon: GalleryIcons.lists_leave_behind,
                    category: GalleryDemoCategory._kMaterialComponents,
                    routeName: BannerDemo.routeName,
                    documentationUrl: "https://api.flutter.dev/flutter/material/MaterialBanner-class.html",
                    buildRoute: (BuildContext context) => new BannerDemo()
                ),
                new GalleryDemo(
                    title: "Bottom app bar",
                    subtitle: "Optional floating action button notch",
                    icon: GalleryIcons.bottom_app_bar,
                    category: GalleryDemoCategory._kMaterialComponents,
                    routeName: BottomAppBarDemo.routeName,
                    documentationUrl: "https://docs.flutter.io/flutter/material/BottomAppBar-class.html",
                    buildRoute: (BuildContext context) => new BottomAppBarDemo()
                ),
                new GalleryDemo(
                    title: "Bottom navigation",
                    subtitle: "Bottom navigation with cross-fading views",
                    icon: GalleryIcons.bottom_navigation,
                    category: GalleryDemoCategory._kMaterialComponents,
                    routeName: BottomNavigationDemo.routeName,
                    documentationUrl: "https://docs.flutter.io/flutter/material/BottomNavigationBar-class.html",
                    buildRoute: (BuildContext context) => new BottomNavigationDemo()
                ),
                new GalleryDemo(
                    title: "Bottom sheet: Modal",
                    subtitle: "A dismissable bottom sheet",
                    icon: GalleryIcons.bottom_sheets,
                    category: GalleryDemoCategory._kMaterialComponents,
                    routeName: ModalBottomSheetDemo.routeName,
                    documentationUrl: "https://docs.flutter.io/flutter/material/showModalBottomSheet.html",
                    buildRoute: (BuildContext context) => new ModalBottomSheetDemo()
                ),
                new GalleryDemo(
                    title: "Bottom sheet: Persistent",
                    subtitle: "A bottom sheet that sticks around",
                    icon: GalleryIcons.bottom_sheet_persistent,
                    category: GalleryDemoCategory._kMaterialComponents,
                    routeName: PersistentBottomSheetDemo.routeName,
                    documentationUrl: "https://docs.flutter.io/flutter/material/ScaffoldState/showBottomSheet.html",
                    buildRoute: (BuildContext context) => new PersistentBottomSheetDemo()
                ),
                new GalleryDemo(
                    title: "Buttons",
                    subtitle: "Flat, raised, dropdown, and more",
                    icon: GalleryIcons.generic_buttons,
                    category: GalleryDemoCategory._kMaterialComponents,
                    routeName: ButtonsDemo.routeName,
                    buildRoute: (BuildContext context) => new ButtonsDemo()
                ),
                new GalleryDemo(
                    title: "Cards",
                    subtitle: "Baseline cards with rounded corners",
                    icon: GalleryIcons.cards,
                    category: GalleryDemoCategory._kMaterialComponents,
                    routeName: CardsDemo.routeName,
                    documentationUrl: "https://docs.flutter.io/flutter/material/Card-class.html",
                    buildRoute: (BuildContext context) => new CardsDemo()
                ),
                new GalleryDemo(
                    title: "Buttons: Floating Action Button",
                    subtitle: "FAB with transitions",
                    icon: GalleryIcons.buttons,
                    category: GalleryDemoCategory._kMaterialComponents,
                    routeName: TabsFabDemo.routeName,
                    documentationUrl: "https://docs.flutter.io/flutter/material/FloatingActionButton-class.html",
                    buildRoute: (BuildContext context) => new TabsFabDemo()
                ),
                new GalleryDemo(
                    title: "Chips",
                    subtitle: "Labeled with delete buttons and avatars",
                    icon: GalleryIcons.chips,
                    category: GalleryDemoCategory._kMaterialComponents,
                    routeName: ChipDemo.routeName,
                    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) => new DataTableDemo()
                ),
                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) => new 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) => new 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) => new 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) => new 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) => new 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) => new TabsDemo()
                ),
                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) => new 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) => new ElevationDemo()
                ),
                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) => new DrawerDemo()
                ),
                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) => new 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) => new 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: "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) => new PageSelectorDemo()
                ),
                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) => new ProgressIndicatorDemo()
                ),
                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) => new 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) => new 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) => new TooltipDemo()
                )
            };

            return galleryDemos;
        }

        public static readonly List<GalleryDemo> kAllGalleryDemos = _buildGalleryDemos();

        public static readonly HashSet<GalleryDemoCategory> kAllGalleryDemoCategories =
            new HashSet<GalleryDemoCategory>(kAllGalleryDemos
                .Select<GalleryDemo, GalleryDemoCategory>((GalleryDemo demo) => demo.category).ToList());


        private static Dictionary<GalleryDemoCategory, List<GalleryDemo>> _generateCategoryToDemos()
        {
            Dictionary<GalleryDemoCategory, List<GalleryDemo>> result =
                new Dictionary<GalleryDemoCategory, List<GalleryDemo>>();

            foreach (var category in kAllGalleryDemoCategories)
                result.Add(category,
                    LinqUtils<GalleryDemo>.WhereList(kAllGalleryDemos,((GalleryDemo demo) => { return demo.category == category; })));

            return result;
        }

        public static readonly Dictionary<GalleryDemoCategory, List<GalleryDemo>> kGalleryCategoryToDemos =
            _generateCategoryToDemos();

        private static Dictionary<string, string> _generateDemoDocumentationUrls()
        {
            Dictionary<string, string> result = new Dictionary<string, string>();

            foreach (var demo in kAllGalleryDemos)
                if (demo.documentationUrl != null)
                    result.Add(demo.routeName, demo.documentationUrl);

            return result;
        }

        public static readonly Dictionary<string, string> kDemoDocumentationUrl = _generateDemoDocumentationUrls();
    }
}