CmdPal: Did someone say grid pages? (#40832)

Closes #38269

Still working on this one, but essentially allows a list page to become
a grid page by specifying a `GridProperties` property like so:

```C#
public AllAppsPage()
{
    PlaceholderText = Resources.search_installed_apps_placeholder;
    GridProperties = new MediumGridLayout();
}
```

> This is a very early version and very subject to change. Much to
clean, but feedback & suggestions are welcome.

## Current preview

### SmallGridLayout

<img width="998" height="607" alt="image"
src="https://github.com/user-attachments/assets/ebdf11fd-6c86-4fc3-bf49-bcbb5d32caa4"
/>


### MediumGridLayout

<img width="976" height="586" alt="image"
src="https://github.com/user-attachments/assets/82daa2e9-548e-4864-8885-1c486ca9f891"
/>

### GalleryGridLayout

<img width="988" height="600" alt="image"
src="https://github.com/user-attachments/assets/23ca486a-35c7-467a-b200-4f6ee5f4a95c"
/>

---------

Co-authored-by: Mike Griese <migrie@microsoft.com>

.github/actions/spell-check/allow/code.txt

@@ -320,4 +320,4 @@ MRUINFO
 REGSTR
 
 # Misc Win32 APIs and PInvokes
-INVOKEIDLIST
+INVOKEIDLIST

.github/actions/spell-check/expect.txt

@@ -1451,7 +1451,6 @@ rstringalnum
 rstringalpha
 rstringdigit
 rtb
-RTB
 RTLREADING
 rtm
 runas

src/modules/cmdpal/Microsoft.CmdPal.Core.ViewModels/GalleryGridPropertiesViewModel.cs

@@ -0,0 +1,34 @@
+// Copyright (c) Microsoft Corporation
+// The Microsoft Corporation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using Microsoft.CmdPal.Core.ViewModels.Models;
+using Microsoft.CommandPalette.Extensions;
+
+namespace Microsoft.CmdPal.Core.ViewModels;
+
+public class GalleryGridPropertiesViewModel : IGridPropertiesViewModel
+{
+    private readonly ExtensionObject<IGalleryGridLayout> _model;
+
+    public GalleryGridPropertiesViewModel(IGalleryGridLayout galleryGridLayout)
+    {
+        _model = new(galleryGridLayout);
+    }
+
+    public bool ShowTitle { get; set; }
+
+    public bool ShowSubtitle { get; set; }
+
+    public void InitializeProperties()
+    {
+        var model = _model.Unsafe;
+        if (model is null)
+        {
+            return; // throw?
+        }
+
+        ShowTitle = model.ShowTitle;
+        ShowSubtitle = model.ShowSubtitle;
+    }
+}

src/modules/cmdpal/Microsoft.CmdPal.Core.ViewModels/IGridPropertiesViewModel.cs

@@ -0,0 +1,10 @@
+// Copyright (c) Microsoft Corporation
+// The Microsoft Corporation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+namespace Microsoft.CmdPal.Core.ViewModels;
+
+public interface IGridPropertiesViewModel
+{
+    void InitializeProperties();
+}

src/modules/cmdpal/Microsoft.CmdPal.Core.ViewModels/ListViewModel.cs

@@ -45,6 +45,10 @@ public partial class ListViewModel : PageViewModel, IDisposable
         (!_isFetching) &&
         IsLoading == false;
 
+    public bool IsGridView { get; private set; }
+
+    public IGridPropertiesViewModel? GridProperties { get; private set; }
+
     // Remember - "observable" properties from the model (via PropChanged)
     // cannot be marked [ObservableProperty]
     public bool ShowDetails { get; private set; }
@@ -516,6 +520,13 @@ public partial class ListViewModel : PageViewModel, IDisposable
 
         _isDynamic = model is IDynamicListPage;
 
+        IsGridView = model.GridProperties is not null;
+        UpdateProperty(nameof(IsGridView));
+
+        GridProperties = LoadGridPropertiesViewModel(model.GridProperties);
+        GridProperties?.InitializeProperties();
+        UpdateProperty(nameof(GridProperties));
+
         ShowDetails = model.ShowDetails;
         UpdateProperty(nameof(ShowDetails));
 
@@ -537,9 +548,27 @@ public partial class ListViewModel : PageViewModel, IDisposable
         model.ItemsChanged += Model_ItemsChanged;
     }
 
+    private IGridPropertiesViewModel? LoadGridPropertiesViewModel(IGridProperties? gridProperties)
+    {
+        if (gridProperties is IMediumGridLayout mediumGridLayout)
+        {
+            return new MediumGridPropertiesViewModel(mediumGridLayout);
+        }
+        else if (gridProperties is IGalleryGridLayout galleryGridLayout)
+        {
+            return new GalleryGridPropertiesViewModel(galleryGridLayout);
+        }
+        else if (gridProperties is ISmallGridLayout smallGridLayout)
+        {
+            return new SmallGridPropertiesViewModel(smallGridLayout);
+        }
+
+        return null;
+    }
+
     public void LoadMoreIfNeeded()
     {
-        var model = this._model.Unsafe;
+        var model = _model.Unsafe;
         if (model is null)
         {
             return;
@@ -583,7 +612,7 @@ public partial class ListViewModel : PageViewModel, IDisposable
     {
         base.FetchProperty(propertyName);
 
-        var model = this._model.Unsafe;
+        var model = _model.Unsafe;
         if (model is null)
         {
             return; // throw?
@@ -591,14 +620,20 @@ public partial class ListViewModel : PageViewModel, IDisposable
 
         switch (propertyName)
         {
+            case nameof(GridProperties):
+                IsGridView = model.GridProperties is not null;
+                GridProperties = LoadGridPropertiesViewModel(model.GridProperties);
+                GridProperties?.InitializeProperties();
+                UpdateProperty(nameof(IsGridView));
+                break;
             case nameof(ShowDetails):
-                this.ShowDetails = model.ShowDetails;
+                ShowDetails = model.ShowDetails;
                 break;
             case nameof(PlaceholderText):
-                this._modelPlaceholderText = model.PlaceholderText;
+                _modelPlaceholderText = model.PlaceholderText;
                 break;
             case nameof(SearchText):
-                this.SearchText = model.SearchText;
+                SearchText = model.SearchText;
                 break;
             case nameof(EmptyContent):
                 EmptyContent = new(new(model.EmptyContent), PageContext);

src/modules/cmdpal/Microsoft.CmdPal.Core.ViewModels/MediumGridPropertiesViewModel.cs

@@ -0,0 +1,31 @@
+// Copyright (c) Microsoft Corporation
+// The Microsoft Corporation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using Microsoft.CmdPal.Core.ViewModels.Models;
+using Microsoft.CommandPalette.Extensions;
+
+namespace Microsoft.CmdPal.Core.ViewModels;
+
+public class MediumGridPropertiesViewModel : IGridPropertiesViewModel
+{
+    private readonly ExtensionObject<IMediumGridLayout> _model;
+
+    public MediumGridPropertiesViewModel(IMediumGridLayout mediumGridLayout)
+    {
+        _model = new(mediumGridLayout);
+    }
+
+    public bool ShowTitle { get; set; }
+
+    public void InitializeProperties()
+    {
+        var model = _model.Unsafe;
+        if (model is null)
+        {
+            return; // throw?
+        }
+
+        ShowTitle = model.ShowTitle;
+    }
+}

src/modules/cmdpal/Microsoft.CmdPal.Core.ViewModels/SmallGridPropertiesViewModel.cs

@@ -0,0 +1,22 @@
+// Copyright (c) Microsoft Corporation
+// The Microsoft Corporation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using Microsoft.CmdPal.Core.ViewModels.Models;
+using Microsoft.CommandPalette.Extensions;
+
+namespace Microsoft.CmdPal.Core.ViewModels;
+
+public class SmallGridPropertiesViewModel : IGridPropertiesViewModel
+{
+    private readonly ExtensionObject<ISmallGridLayout> _model;
+
+    public SmallGridPropertiesViewModel(ISmallGridLayout smallGridLayout)
+    {
+        _model = new(smallGridLayout);
+    }
+
+    public void InitializeProperties()
+    {
+    }
+}

src/modules/cmdpal/Microsoft.CmdPal.UI/Converters/GridItemTemplateSelector.cs

@@ -0,0 +1,40 @@
+// Copyright (c) Microsoft Corporation
+// The Microsoft Corporation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using Microsoft.CmdPal.Core.ViewModels;
+using Microsoft.UI.Xaml;
+using Microsoft.UI.Xaml.Controls;
+
+namespace Microsoft.CmdPal.UI;
+
+internal sealed partial class GridItemTemplateSelector : DataTemplateSelector
+{
+    public IGridPropertiesViewModel? GridProperties { get; set; }
+
+    public DataTemplate? Small { get; set; }
+
+    public DataTemplate? Medium { get; set; }
+
+    public DataTemplate? Gallery { get; set; }
+
+    protected override DataTemplate? SelectTemplateCore(object item, DependencyObject dependencyObject)
+    {
+        DataTemplate? dataTemplate = Medium;
+
+        if (GridProperties is SmallGridPropertiesViewModel)
+        {
+            dataTemplate = Small;
+        }
+        else if (GridProperties is MediumGridPropertiesViewModel)
+        {
+            dataTemplate = Medium;
+        }
+        else if (GridProperties is GalleryGridPropertiesViewModel)
+        {
+            dataTemplate = Gallery;
+        }
+
+        return dataTemplate;
+    }
+}

src/modules/cmdpal/Microsoft.CmdPal.UI/ExtViews/ListPage.xaml

@@ -3,6 +3,7 @@
     x:Class="Microsoft.CmdPal.UI.ListPage"
     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns:cmdpalUI="using:Microsoft.CmdPal.UI"
     xmlns:controls="using:CommunityToolkit.WinUI.Controls"
     xmlns:converters="using:CommunityToolkit.WinUI.Converters"
     xmlns:coreViewModels="using:Microsoft.CmdPal.Core.ViewModels"
@@ -11,8 +12,11 @@
     xmlns:help="using:Microsoft.CmdPal.UI.Helpers"
     xmlns:local="using:Microsoft.CmdPal.UI"
     xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+    xmlns:ui="using:CommunityToolkit.WinUI"
     xmlns:viewModels="using:Microsoft.CmdPal.UI.ViewModels"
+    x:Name="PageRoot"
     Background="Transparent"
+    DataContext="{x:Bind ViewModel, Mode=OneWay}"
     mc:Ignorable="d">
 
     <Page.Resources>
@@ -23,6 +27,7 @@
             IsSourceGrouped="True"
             Source="{x:Bind ViewModel.Items, Mode=OneWay}" />-->
 
+        <converters:BoolToVisibilityConverter x:Key="BoolToVisibilityConverter" />
         <converters:StringVisibilityConverter
             x:Key="StringVisibilityConverter"
             EmptyValue="Collapsed"
@@ -39,6 +44,14 @@
                 ToolTipService.ToolTip="{x:Bind ToolTip, Mode=OneWay}" />
         </DataTemplate>
 
+        <cmdpalUI:GridItemTemplateSelector
+            x:Key="GridItemTemplateSelector"
+            x:DataType="coreViewModels:ListItemViewModel"
+            Gallery="{StaticResource GalleryGridItemViewModelTemplate}"
+            GridProperties="{x:Bind ViewModel.GridProperties}"
+            Medium="{StaticResource MediumGridItemViewModelTemplate}"
+            Small="{StaticResource SmallGridItemViewModelTemplate}" />
+
         <!--  https://learn.microsoft.com/windows/apps/design/controls/itemsview#specify-the-look-of-the-items  -->
         <DataTemplate x:Key="ListItemViewModelTemplate" x:DataType="coreViewModels:ListItemViewModel">
             <Grid
@@ -102,6 +115,145 @@
                 </ItemsControl>
             </Grid>
         </DataTemplate>
+
+        <!--  Grid item templates for visual grid representation  -->
+        <DataTemplate x:Key="SmallGridItemViewModelTemplate" x:DataType="coreViewModels:ListItemViewModel">
+            <StackPanel
+                Width="60"
+                Height="60"
+                Padding="8,16"
+                HorizontalAlignment="Center"
+                VerticalAlignment="Center"
+                AutomationProperties.Name="{x:Bind Title}"
+                BorderThickness="0"
+                CornerRadius="8"
+                Orientation="Vertical"
+                ToolTipService.ToolTip="{x:Bind Title}">
+
+                <cpcontrols:IconBox
+                    x:Name="GridIconBorder"
+                    Width="28"
+                    Height="28"
+                    Margin="0"
+                    HorizontalAlignment="Center"
+                    VerticalAlignment="Center"
+                    Foreground="{ThemeResource TextFillColorPrimary}"
+                    SourceKey="{x:Bind Icon, Mode=OneWay}"
+                    SourceRequested="{x:Bind help:IconCacheProvider.SourceRequested}" />
+
+            </StackPanel>
+        </DataTemplate>
+
+        <DataTemplate x:Key="MediumGridItemViewModelTemplate" x:DataType="coreViewModels:ListItemViewModel">
+            <StackPanel
+                Width="100"
+                Height="100"
+                Padding="8,16"
+                HorizontalAlignment="Center"
+                VerticalAlignment="Center"
+                AutomationProperties.Name="{x:Bind Title}"
+                BorderThickness="0"
+                CornerRadius="8"
+                Orientation="Vertical"
+                ToolTipService.ToolTip="{x:Bind Title}">
+
+                <cpcontrols:IconBox
+                    x:Name="GridIconBorder"
+                    Width="36"
+                    Height="36"
+                    Margin="0"
+                    HorizontalAlignment="Center"
+                    VerticalAlignment="Center"
+                    CharacterSpacing="12"
+                    FontSize="14"
+                    Foreground="{ThemeResource TextFillColorPrimary}"
+                    SourceKey="{x:Bind Icon, Mode=OneWay}"
+                    SourceRequested="{x:Bind help:IconCacheProvider.SourceRequested}" />
+
+                <TextBlock
+                    x:Name="TitleTextBlock"
+                    MaxHeight="40"
+                    Margin="0,8,0,4"
+                    HorizontalAlignment="Center"
+                    VerticalAlignment="Center"
+                    CharacterSpacing="12"
+                    FontSize="12"
+                    Text="{x:Bind Title}"
+                    TextAlignment="Center"
+                    TextTrimming="WordEllipsis"
+                    TextWrapping="Wrap"
+                    Visibility="{Binding ElementName=PageRoot, Path=DataContext.GridProperties.ShowTitle, Mode=OneWay, Converter={StaticResource BoolToVisibilityConverter}}" />
+            </StackPanel>
+        </DataTemplate>
+
+        <DataTemplate x:Key="GalleryGridItemViewModelTemplate" x:DataType="coreViewModels:ListItemViewModel">
+            <StackPanel
+                Width="160"
+                Margin="4"
+                Padding="0"
+                HorizontalAlignment="Center"
+                VerticalAlignment="Center"
+                AutomationProperties.Name="{x:Bind Title}"
+                BorderThickness="0"
+                CornerRadius="4"
+                Orientation="Vertical"
+                ToolTipService.ToolTip="{x:Bind Title}">
+
+                <Grid
+                    Width="160"
+                    Height="160"
+                    Margin="0"
+                    HorizontalAlignment="Center"
+                    VerticalAlignment="Center"
+                    CornerRadius="4">
+                    <Grid.RowDefinitions>
+                        <RowDefinition />
+                    </Grid.RowDefinitions>
+                    <Viewbox
+                        Grid.Row="1"
+                        HorizontalAlignment="Center"
+                        Stretch="UniformToFill"
+                        StretchDirection="Both">
+                        <cpcontrols:IconBox
+                            CornerRadius="4"
+                            Foreground="{ThemeResource TextFillColorPrimary}"
+                            SourceKey="{x:Bind Icon, Mode=OneWay}"
+                            SourceRequested="{x:Bind help:IconCacheProvider.SourceRequested}" />
+                    </Viewbox>
+                </Grid>
+
+                <StackPanel Padding="4" Orientation="Vertical">
+                    <TextBlock
+                        x:Name="TitleTextBlock"
+                        MaxWidth="152"
+                        MaxHeight="40"
+                        Margin="0"
+                        HorizontalAlignment="Left"
+                        VerticalAlignment="Center"
+                        CharacterSpacing="12"
+                        FontSize="14"
+                        Foreground="{ThemeResource TextFillColorPrimary}"
+                        Text="{x:Bind Title}"
+                        TextAlignment="Center"
+                        TextTrimming="WordEllipsis"
+                        TextWrapping="NoWrap" />
+                    <TextBlock
+                        x:Name="SubTitleTextBlock"
+                        MaxWidth="152"
+                        MaxHeight="40"
+                        Margin="0,4,0,0"
+                        HorizontalAlignment="Left"
+                        VerticalAlignment="Center"
+                        CharacterSpacing="11"
+                        FontSize="11"
+                        Foreground="{ThemeResource TextFillColorTertiary}"
+                        Text="{x:Bind Subtitle}"
+                        TextAlignment="Center"
+                        TextTrimming="WordEllipsis"
+                        TextWrapping="NoWrap" />
+                </StackPanel>
+            </StackPanel>
+        </DataTemplate>
     </Page.Resources>
 
     <Grid>
@@ -110,66 +262,50 @@
             TargetType="x:Boolean"
             Value="{x:Bind ViewModel.ShowEmptyContent, Mode=OneWay}">
             <controls:Case Value="False">
-                <ListView
-                    x:Name="ItemsList"
-                    Padding="0,2,0,0"
-                    ContextCanceled="ItemsList_OnContextCanceled"
-                    ContextRequested="ItemsList_OnContextRequested"
-                    DoubleTapped="ItemsList_DoubleTapped"
-                    IsDoubleTapEnabled="True"
-                    IsItemClickEnabled="True"
-                    ItemClick="ItemsList_ItemClick"
-                    ItemTemplate="{StaticResource ListItemViewModelTemplate}"
-                    ItemsSource="{x:Bind ViewModel.FilteredItems, Mode=OneWay}"
-                    SelectionChanged="ItemsList_SelectionChanged">
-                    <ListView.ItemContainerTransitions>
-                        <TransitionCollection />
-                    </ListView.ItemContainerTransitions>
-                    <!--<ListView.GroupStyle>
-                        <GroupStyle HidesIfEmpty="True">
-                            <GroupStyle.HeaderTemplate>
-                                <DataTemplate>
-                                    <TextBlock
-                                        Margin="0,16,0,0"
-                                        Foreground="{ThemeResource TextFillColorSecondaryBrush}"
-                                        Text="{Binding Key, Mode=OneWay}" />
-                                </DataTemplate>
-                            </GroupStyle.HeaderTemplate>
-                        </GroupStyle>
-                    </ListView.GroupStyle>-->
-                </ListView>
-            </controls:Case>
-            <controls:Case Value="True">
-                <StackPanel
-                    Margin="24"
-                    HorizontalAlignment="Center"
-                    VerticalAlignment="Center"
-                    Orientation="Vertical"
-                    Spacing="4">
-                    <cpcontrols:IconBox
-                        x:Name="IconBorder"
-                        Width="48"
-                        Height="48"
-                        Margin="8"
-                        Foreground="{ThemeResource TextFillColorSecondaryBrush}"
-                        SourceKey="{x:Bind ViewModel.EmptyContent.Icon, Mode=OneWay}"
-                        SourceRequested="{x:Bind help:IconCacheProvider.SourceRequested}" />
-                    <TextBlock
-                        Margin="0,4,0,0"
-                        HorizontalAlignment="Center"
-                        FontWeight="SemiBold"
-                        Text="{x:Bind ViewModel.EmptyContent.Title, Mode=OneWay}"
-                        TextAlignment="Center"
-                        TextWrapping="Wrap" />
-                    <TextBlock
-                        HorizontalAlignment="Center"
-                        Foreground="{ThemeResource TextFillColorSecondaryBrush}"
-                        Text="{x:Bind ViewModel.EmptyContent.Subtitle, Mode=OneWay}"
-                        TextAlignment="Center"
-                        TextWrapping="Wrap" />
-                </StackPanel>
+                <controls:SwitchPresenter
+                    HorizontalAlignment="Stretch"
+                    TargetType="x:Boolean"
+                    Value="{x:Bind ViewModel.IsGridView, Mode=OneWay}">
+                    <controls:Case Value="False">
+                        <ListView
+                            x:Name="ItemsList"
+                            Padding="0,2,0,0"
+                            ContextCanceled="Items_OnContextCanceled"
+                            ContextRequested="Items_OnContextRequested"
+                            DoubleTapped="Items_DoubleTapped"
+                            IsDoubleTapEnabled="True"
+                            IsItemClickEnabled="True"
+                            ItemClick="Items_ItemClick"
+                            ItemTemplate="{StaticResource ListItemViewModelTemplate}"
+                            ItemsSource="{x:Bind ViewModel.FilteredItems, Mode=OneWay}"
+                            RightTapped="Items_RightTapped"
+                            SelectionChanged="Items_SelectionChanged">
+                            <ListView.ItemContainerTransitions>
+                                <TransitionCollection />
+                            </ListView.ItemContainerTransitions>
+                        </ListView>
+                    </controls:Case>
+                    <controls:Case Value="True">
+                        <GridView
+                            x:Name="ItemsGrid"
+                            Padding="8"
+                            ContextCanceled="Items_OnContextCanceled"
+                            ContextRequested="Items_OnContextRequested"
+                            DoubleTapped="Items_DoubleTapped"
+                            IsDoubleTapEnabled="True"
+                            IsItemClickEnabled="True"
+                            ItemClick="Items_ItemClick"
+                            ItemTemplateSelector="{StaticResource GridItemTemplateSelector}"
+                            ItemsSource="{x:Bind ViewModel.FilteredItems, Mode=OneWay}"
+                            RightTapped="Items_RightTapped"
+                            SelectionChanged="Items_SelectionChanged">
+                            <GridView.ItemContainerTransitions>
+                                <TransitionCollection />
+                            </GridView.ItemContainerTransitions>
+                        </GridView>
+                    </controls:Case>
+                </controls:SwitchPresenter>
             </controls:Case>
         </controls:SwitchPresenter>
-
     </Grid>
 </Page>

src/modules/cmdpal/Microsoft.CmdPal.UI/ExtViews/ListPage.xaml.cs

@@ -13,6 +13,7 @@ using Microsoft.CmdPal.UI.ViewModels;
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.UI.Xaml;
 using Microsoft.UI.Xaml.Controls;
+using Microsoft.UI.Xaml.Controls.Primitives;
 using Microsoft.UI.Xaml.Input;
 using Microsoft.UI.Xaml.Media;
 using Microsoft.UI.Xaml.Navigation;
@@ -38,13 +39,21 @@ public sealed partial class ListPage : Page,
     public static readonly DependencyProperty ViewModelProperty =
         DependencyProperty.Register(nameof(ViewModel), typeof(ListViewModel), typeof(ListPage), new PropertyMetadata(null, OnViewModelChanged));
 
+    private ListViewBase ItemView
+    {
+        get
+        {
+            return ViewModel?.IsGridView == true ? ItemsGrid : ItemsList;
+        }
+    }
+
     public ListPage()
     {
         this.InitializeComponent();
         this.NavigationCacheMode = NavigationCacheMode.Disabled;
-        this.ItemsList.Loaded += ItemsList_Loaded;
-        this.ItemsList.PreviewKeyDown += ItemsList_PreviewKeyDown;
-        this.ItemsList.PointerPressed += ItemsList_PointerPressed;
+        this.ItemView.Loaded += Items_Loaded;
+        this.ItemView.PreviewKeyDown += Items_PreviewKeyDown;
+        this.ItemView.PointerPressed += Items_PointerPressed;
     }
 
     protected override void OnNavigatedTo(NavigationEventArgs e)
@@ -55,11 +64,11 @@ public sealed partial class ListPage : Page,
         }
 
         if (e.NavigationMode == NavigationMode.Back
-            || (e.NavigationMode == NavigationMode.New && ItemsList.Items.Count > 0))
+            || (e.NavigationMode == NavigationMode.New && ItemView.Items.Count > 0))
         {
             // Upon navigating _back_ to this page, immediately select the
             // first item in the list
-            ItemsList.SelectedIndex = 0;
+            ItemView.SelectedIndex = 0;
         }
 
         // RegisterAll isn't AOT compatible
@@ -90,7 +99,6 @@ public sealed partial class ListPage : Page,
         {
             ViewModel?.SafeCleanup();
             CleanupHelper.Cleanup(this);
-            Bindings.StopTracking();
         }
 
         // Clean-up event listeners
@@ -100,7 +108,7 @@ public sealed partial class ListPage : Page,
     }
 
     [System.Diagnostics.CodeAnalysis.SuppressMessage("CodeQuality", "IDE0051:Remove unused private members", Justification = "VS is too aggressive at pruning methods bound in XAML")]
-    private void ItemsList_ItemClick(object sender, ItemClickEventArgs e)
+    private void Items_ItemClick(object sender, ItemClickEventArgs e)
     {
         if (e.ClickedItem is ListItemViewModel item)
         {
@@ -123,9 +131,9 @@ public sealed partial class ListPage : Page,
         }
     }
 
-    private void ItemsList_DoubleTapped(object sender, DoubleTappedRoutedEventArgs e)
+    private void Items_DoubleTapped(object sender, DoubleTappedRoutedEventArgs e)
     {
-        if (ItemsList.SelectedItem is ListItemViewModel vm)
+        if (ItemView.SelectedItem is ListItemViewModel vm)
         {
             var settings = App.Current.Services.GetService<SettingsModel>()!;
             if (!settings.SingleClickActivates)
@@ -136,10 +144,10 @@ public sealed partial class ListPage : Page,
     }
 
     [System.Diagnostics.CodeAnalysis.SuppressMessage("CodeQuality", "IDE0051:Remove unused private members", Justification = "VS is too aggressive at pruning methods bound in XAML")]
-    private void ItemsList_SelectionChanged(object sender, SelectionChangedEventArgs e)
+    private void Items_SelectionChanged(object sender, SelectionChangedEventArgs e)
     {
         var vm = ViewModel;
-        var li = ItemsList.SelectedItem as ListItemViewModel;
+        var li = ItemView.SelectedItem as ListItemViewModel;
         _ = Task.Run(() =>
         {
             vm?.UpdateSelectedItemCommand.Execute(li);
@@ -154,12 +162,12 @@ public sealed partial class ListPage : Page,
         // here, then in Page_ItemsUpdated trying to select that cached item if
         // it's in the list (otherwise, clear the cache), but that seems
         // aggressively BODGY for something that mostly just works today.
-        if (ItemsList.SelectedItem is not null)
+        if (ItemView.SelectedItem is not null)
         {
-            ItemsList.ScrollIntoView(ItemsList.SelectedItem);
+            ItemView.ScrollIntoView(ItemView.SelectedItem);
 
             // Automation notification for screen readers
-            var listViewPeer = Microsoft.UI.Xaml.Automation.Peers.ListViewAutomationPeer.CreatePeerForElement(ItemsList);
+            var listViewPeer = Microsoft.UI.Xaml.Automation.Peers.ListViewAutomationPeer.CreatePeerForElement(ItemView);
             if (listViewPeer is not null && li is not null)
             {
                 var notificationText = li.Title;
@@ -172,10 +180,37 @@ public sealed partial class ListPage : Page,
         }
     }
 
-    private void ItemsList_Loaded(object sender, RoutedEventArgs e)
+    private void Items_RightTapped(object sender, RightTappedRoutedEventArgs e)
     {
-        // Find the ScrollViewer in the ListView
-        var listViewScrollViewer = FindScrollViewer(this.ItemsList);
+        if (e.OriginalSource is FrameworkElement element &&
+            element.DataContext is ListItemViewModel item)
+        {
+            if (ItemView.SelectedItem != item)
+            {
+                ItemView.SelectedItem = item;
+            }
+
+            ViewModel?.UpdateSelectedItemCommand.Execute(item);
+
+            var pos = e.GetPosition(element);
+
+            _ = DispatcherQueue.TryEnqueue(
+                () =>
+                {
+                    WeakReferenceMessenger.Default.Send<OpenContextMenuMessage>(
+                        new OpenContextMenuMessage(
+                            element,
+                            Microsoft.UI.Xaml.Controls.Primitives.FlyoutPlacementMode.BottomEdgeAlignedLeft,
+                            pos,
+                            ContextMenuFilterLocation.Top));
+                });
+        }
+    }
+
+    private void Items_Loaded(object sender, RoutedEventArgs e)
+    {
+        // Find the ScrollViewer in the ItemView (ItemsList or ItemsGrid)
+        var listViewScrollViewer = FindScrollViewer(this.ItemView);
 
         if (listViewScrollViewer is not null)
         {
@@ -207,25 +242,25 @@ public sealed partial class ListPage : Page,
         // And then have these commands manipulate that state being bound to the UI instead
         // We may want to see how other non-list UIs need to behave to make this decision
         // At least it's decoupled from the SearchBox now :)
-        if (ItemsList.SelectedIndex < ItemsList.Items.Count - 1)
+        if (ItemView.SelectedIndex < ItemView.Items.Count - 1)
         {
-            ItemsList.SelectedIndex++;
+            ItemView.SelectedIndex++;
         }
         else
         {
-            ItemsList.SelectedIndex = 0;
+            ItemView.SelectedIndex = 0;
         }
     }
 
     public void Receive(NavigatePreviousCommand message)
     {
-        if (ItemsList.SelectedIndex > 0)
+        if (ItemView.SelectedIndex > 0)
         {
-            ItemsList.SelectedIndex--;
+            ItemView.SelectedIndex--;
         }
         else
         {
-            ItemsList.SelectedIndex = ItemsList.Items.Count - 1;
+            ItemView.SelectedIndex = ItemView.Items.Count - 1;
         }
     }
 
@@ -235,7 +270,7 @@ public sealed partial class ListPage : Page,
         {
             ViewModel?.InvokeItemCommand.Execute(null);
         }
-        else if (ItemsList.SelectedItem is ListItemViewModel item)
+        else if (ItemView.SelectedItem is ListItemViewModel item)
         {
             ViewModel?.InvokeItemCommand.Execute(item);
         }
@@ -247,7 +282,7 @@ public sealed partial class ListPage : Page,
         {
             ViewModel?.InvokeSecondaryCommandCommand.Execute(null);
         }
-        else if (ItemsList.SelectedItem is ListItemViewModel item)
+        else if (ItemView.SelectedItem is ListItemViewModel item)
         {
             ViewModel?.InvokeSecondaryCommandCommand.Execute(item);
         }
@@ -283,19 +318,19 @@ public sealed partial class ListPage : Page,
         //
         // It's important to do this here, because once there's no selection
         // (which can happen as the list updates) we won't get an
-        // ItemsList_SelectionChanged again to give us another chance to change
+        // ItemView_SelectionChanged again to give us another chance to change
         // the selection from null -> something. Better to just update the
         // selection once, at the end of all the updating.
-        if (ItemsList.SelectedItem is null)
+        if (ItemView.SelectedItem is null)
         {
-            ItemsList.SelectedIndex = 0;
+            ItemView.SelectedIndex = 0;
         }
 
         // Always reset the selected item when the top-level list page changes
         // its items
         if (!sender.IsNested)
         {
-            ItemsList.SelectedIndex = 0;
+            ItemView.SelectedIndex = 0;
         }
     }
 
@@ -304,7 +339,7 @@ public sealed partial class ListPage : Page,
         var prop = e.PropertyName;
         if (prop == nameof(ViewModel.FilteredItems))
         {
-            Debug.WriteLine($"ViewModel.FilteredItems {ItemsList.SelectedItem}");
+            Debug.WriteLine($"ViewModel.FilteredItems {ItemView.SelectedItem}");
         }
     }
 
@@ -328,12 +363,12 @@ public sealed partial class ListPage : Page,
         return null;
     }
 
-    private void ItemsList_OnContextRequested(UIElement sender, ContextRequestedEventArgs e)
+    private void Items_OnContextRequested(UIElement sender, ContextRequestedEventArgs e)
     {
         var (item, element) = e.OriginalSource switch
         {
             // caused by keyboard shortcut (e.g. Context menu key or Shift+F10)
-            ListViewItem listViewItem => (ItemsList.ItemFromContainer(listViewItem) as ListItemViewModel, listViewItem),
+            SelectorItem selectorItem => (ItemView.ItemFromContainer(selectorItem) as ListItemViewModel, selectorItem),
 
             // caused by right-click on the ListViewItem
             FrameworkElement { DataContext: ListItemViewModel itemViewModel } frameworkElement => (itemViewModel, frameworkElement),
@@ -346,9 +381,9 @@ public sealed partial class ListPage : Page,
             return;
         }
 
-        if (ItemsList.SelectedItem != item)
+        if (ItemView.SelectedItem != item)
         {
-            ItemsList.SelectedItem = item;
+            ItemView.SelectedItem = item;
         }
 
         ViewModel?.UpdateSelectedItemCommand.Execute(item);
@@ -371,14 +406,14 @@ public sealed partial class ListPage : Page,
         e.Handled = true;
     }
 
-    private void ItemsList_OnContextCanceled(UIElement sender, RoutedEventArgs e)
+    private void Items_OnContextCanceled(UIElement sender, RoutedEventArgs e)
     {
         _ = DispatcherQueue.TryEnqueue(() => WeakReferenceMessenger.Default.Send<CloseContextMenuMessage>());
     }
 
-    private void ItemsList_PointerPressed(object sender, PointerRoutedEventArgs e) => _lastInputSource = InputSource.Pointer;
+    private void Items_PointerPressed(object sender, PointerRoutedEventArgs e) => _lastInputSource = InputSource.Pointer;
 
-    private void ItemsList_PreviewKeyDown(object sender, KeyRoutedEventArgs e)
+    private void Items_PreviewKeyDown(object sender, KeyRoutedEventArgs e)
     {
         if (e.Key is VirtualKey.Enter or VirtualKey.Space)
         {

src/modules/cmdpal/ext/SamplePagesExtension/Pages/SampleGalleryListPage.cs

@@ -0,0 +1,66 @@
+// Copyright (c) Microsoft Corporation
+// The Microsoft Corporation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using Microsoft.CommandPalette.Extensions;
+using Microsoft.CommandPalette.Extensions.Toolkit;
+
+namespace SamplePagesExtension;
+
+internal sealed partial class SampleGalleryListPage : ListPage
+{
+    public SampleGalleryListPage()
+    {
+        Icon = new IconInfo("\uE7C5");
+        Name = "Sample Gallery List Page";
+        GridProperties = new GalleryGridLayout();
+    }
+
+    public override IListItem[] GetItems()
+    {
+        return [
+            new ListItem(new NoOpCommand())
+            {
+                Title = "Sample Title",
+                Subtitle = "I don't do anything",
+                Icon = IconHelpers.FromRelativePath("Assets/Images/RedRectangle.png"),
+            },
+            new ListItem(new NoOpCommand())
+            {
+                Title = "Another Title",
+                Subtitle = "I don't do anything",
+                Icon = IconHelpers.FromRelativePath("Assets/Images/Swirls.png"),
+            },
+            new ListItem(new NoOpCommand())
+            {
+                Title = "More Titles",
+                Subtitle = "I don't do anything",
+                Icon = IconHelpers.FromRelativePath("Assets/Images/Win-Digital.png"),
+            },
+            new ListItem(new NoOpCommand())
+            {
+                Title = "Stop With The Titles",
+                Subtitle = "I don't do anything",
+                Icon = IconHelpers.FromRelativePath("Assets/Images/RedRectangle.png"),
+            },
+            new ListItem(new NoOpCommand())
+            {
+                Title = "Another Title",
+                Subtitle = "I don't do anything",
+                Icon = IconHelpers.FromRelativePath("Assets/Images/Space.png"),
+            },
+            new ListItem(new NoOpCommand())
+            {
+                Title = "More Titles",
+                Subtitle = "I don't do anything",
+                Icon = IconHelpers.FromRelativePath("Assets/Images/Swirls.png"),
+            },
+            new ListItem(new NoOpCommand())
+            {
+                Title = "Stop With The Titles",
+                Subtitle = "I don't do anything",
+                Icon = IconHelpers.FromRelativePath("Assets/Images/Win-Digital.png"),
+            },
+        ];
+    }
+}

src/modules/cmdpal/ext/SamplePagesExtension/SamplesListPage.cs

@@ -33,6 +33,11 @@ public partial class SamplesListPage : ListPage
             Title = "Dynamic List Page Command",
             Subtitle = "Changes the list of items in response to the typed query",
         },
+        new ListItem(new SampleGalleryListPage())
+        {
+            Title = "Gallery List Page Command",
+            Subtitle = "Displays items as a gallery",
+        },
         new ListItem(new OnLoadPage())
         {
             Title = "Demo of OnLoad/OnUnload",

src/modules/cmdpal/extensionsdk/Microsoft.CommandPalette.Extensions.Toolkit/GalleryGridLayout.cs

@@ -0,0 +1,32 @@
+// Copyright (c) Microsoft Corporation
+// The Microsoft Corporation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+namespace Microsoft.CommandPalette.Extensions.Toolkit;
+
+public partial class GalleryGridLayout : BaseObservable, IGalleryGridLayout
+{
+    public virtual bool ShowTitle
+    {
+        get => field;
+        set
+        {
+            field = value;
+            OnPropertyChanged(nameof(ShowTitle));
+        }
+    }
+
+    = true;
+
+    public virtual bool ShowSubtitle
+    {
+        get => field;
+        set
+        {
+            field = value;
+            OnPropertyChanged(nameof(ShowSubtitle));
+        }
+    }
+
+    = true;
+}

src/modules/cmdpal/extensionsdk/Microsoft.CommandPalette.Extensions.Toolkit/MediumGridLayout.cs

@@ -0,0 +1,20 @@
+// Copyright (c) Microsoft Corporation
+// The Microsoft Corporation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+namespace Microsoft.CommandPalette.Extensions.Toolkit;
+
+public partial class MediumGridLayout : BaseObservable, IMediumGridLayout
+{
+    public virtual bool ShowTitle
+    {
+        get => field;
+        set
+        {
+            field = value;
+            OnPropertyChanged(nameof(ShowTitle));
+        }
+    }
+
+    = true;
+}

src/modules/cmdpal/extensionsdk/Microsoft.CommandPalette.Extensions.Toolkit/SmallGridLayout.cs

@@ -0,0 +1,9 @@
+// Copyright (c) Microsoft Corporation
+// The Microsoft Corporation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+namespace Microsoft.CommandPalette.Extensions.Toolkit;
+
+public partial class SmallGridLayout : BaseObservable, ISmallGridLayout
+{
+}

src/modules/cmdpal/extensionsdk/Microsoft.CommandPalette.Extensions/Microsoft.CommandPalette.Extensions.idl

@@ -273,10 +273,26 @@ namespace Microsoft.CommandPalette.Extensions
         String Section { get; };
         String TextToSuggest { get; };
     }
+
+    [uuid("50C6F080-1CBE-4CE4-B92F-DA2F116ED524")]
+    [contract(Microsoft.CommandPalette.Extensions.ExtensionsContract, 1)]
+    interface IGridProperties requires INotifyPropChanged { }
+
+    [uuid("05914D59-6ECB-4992-9CF2-5982B5120A26")]
+    [contract(Microsoft.CommandPalette.Extensions.ExtensionsContract, 1)]
+    interface ISmallGridLayout requires IGridProperties { }
     
     [contract(Microsoft.CommandPalette.Extensions.ExtensionsContract, 1)]
-    interface IGridProperties  {
-        Windows.Foundation.Size TileSize { get; };
+    interface IMediumGridLayout requires IGridProperties
+    {
+        Boolean ShowTitle { get; };
+    }
+    
+    [contract(Microsoft.CommandPalette.Extensions.ExtensionsContract, 1)]
+    interface IGalleryGridLayout requires IGridProperties
+    {
+        Boolean ShowTitle { get; };
+        Boolean ShowSubtitle { get; };
     }
     
     [contract(Microsoft.CommandPalette.Extensions.ExtensionsContract, 1)]