CmdPal: Fix grid views (#43991)

## Summary of the Pull Request

This PR fixes the crash due to binding to a trimmed property. For this
it converts runtime bindings on GridView to use `{x:Bind}` so this issue
can't happen in the future.

- Fixes a crash related to the `Visibility` property in gallery/grid
views when trimmed during AOT builds.
- Fixes ShowTitle and ShowSubtitle properties, they are now taken into
account in a view.
- Improves UI layout, removes some margins and maches the corner radius
of the item contaienr with the item content in the gallery view.
- Refactores gallery and grid views to move logic from the view to the
view model so we can x:Bind to them.
- Replaces `{Binding}` with `{x:Bind}` to improve performance and enable
compile-time binding validation.
- Properties related to grids are splatted on to the common
`IGridPropertiesViewModel` interface. Subclassing would add extra
overhead without substential benefit.
- Adds new samples to showcase various grid view configurations.

## Pictures? Pictures!

A) Gallery view (with title and subtitle)
<img width="909" height="583" alt="image"
src="https://github.com/user-attachments/assets/b807e7a8-412f-4817-8121-e3470c49e0c0"
/>

B) Gallery view (only title)
<img width="903" height="582" alt="image"
src="https://github.com/user-attachments/assets/b619d63f-04d0-42f2-9207-de256dc5e481"
/>

C) Gallery view (no title or subtitle)
<img width="900" height="583" alt="image"
src="https://github.com/user-attachments/assets/c48cd1fc-8f51-40c1-8bce-607916e9f742"
/>

D) Small icons
<img width="907" height="582" alt="image"
src="https://github.com/user-attachments/assets/8327da0a-fa45-443f-b52c-f0f1edd7b861"
/>

E) Medium icons (with labels)
<img width="914" height="588" alt="image"
src="https://github.com/user-attachments/assets/dee9fab1-54e8-45f8-96d7-502b121a6ac2"
/>

F) Medium icons (no labels)
<img width="915" height="588" alt="image"
src="https://github.com/user-attachments/assets/a32e8af2-6cb1-4106-91db-ca396253c0a3"
/>


<!-- Please review the items on the PR checklist before submitting-->
## PR Checklist

- [x] Closes: #43973
<!-- - [ ] Closes: #yyy (add separate lines for additional resolved
issues) -->
- [ ] **Communication:** I've discussed this with core contributors
already. If the work hasn't been agreed, this work might be rejected
- [ ] **Tests:** Added/updated and all pass
- [ ] **Localization:** All end-user-facing strings can be localized
- [ ] **Dev docs:** Added/updated
- [ ] **New binaries:** Added on the required places
- [ ] [JSON for
signing](https://github.com/microsoft/PowerToys/blob/main/.pipelines/ESRPSigning_core.json)
for new binaries
- [ ] [WXS for
installer](https://github.com/microsoft/PowerToys/blob/main/installer/PowerToysSetup/Product.wxs)
for new binaries and localization folder
- [ ] [YML for CI
pipeline](https://github.com/microsoft/PowerToys/blob/main/.pipelines/ci/templates/build-powertoys-steps.yml)
for new test projects
- [ ] [YML for signed
pipeline](https://github.com/microsoft/PowerToys/blob/main/.pipelines/release.yml)
- [ ] **Documentation updated:** If checked, please file a pull request
on [our docs
repo](https://github.com/MicrosoftDocs/windows-uwp/tree/docs/hub/powertoys)
and link it here: #xxx

<!-- Provide a more detailed description of the PR, other things fixed,
or any additional comments/features here -->
## Detailed Description of the Pull Request / Additional comments

<!-- Describe how you validated the behavior. Add automated tests
wherever possible, but list manual validation steps taken as well -->
## Validation Steps Performed

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

@@ -11,15 +11,15 @@ public class GalleryGridPropertiesViewModel : IGridPropertiesViewModel
 {
     private readonly ExtensionObject<IGalleryGridLayout> _model;
 
+    public bool ShowTitle { get; private set; }
+
+    public bool ShowSubtitle { get; private set; }
+
     public GalleryGridPropertiesViewModel(IGalleryGridLayout galleryGridLayout)
     {
         _model = new(galleryGridLayout);
     }
 
-    public bool ShowTitle { get; set; }
-
-    public bool ShowSubtitle { get; set; }
-
     public void InitializeProperties()
     {
         var model = _model.Unsafe;

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

@@ -6,5 +6,9 @@ namespace Microsoft.CmdPal.Core.ViewModels;
 
 public interface IGridPropertiesViewModel
 {
+    bool ShowTitle { get; }
+
+    bool ShowSubtitle { get; }
+
     void InitializeProperties();
 }

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

@@ -10,10 +10,9 @@ using Microsoft.CommandPalette.Extensions.Toolkit;
 
 namespace Microsoft.CmdPal.Core.ViewModels;
 
-public partial class ListItemViewModel(IListItem model, WeakReference<IPageContext> context)
-    : CommandItemViewModel(new(model), context)
+public partial class ListItemViewModel : CommandItemViewModel
 {
-    public new ExtensionObject<IListItem> Model { get; } = new(model);
+    public new ExtensionObject<IListItem> Model { get; }
 
     public List<TagViewModel>? Tags { get; set; }
 
@@ -32,6 +31,40 @@ public partial class ListItemViewModel(IListItem model, WeakReference<IPageConte
 
     public string AccessibleName { get; private set; } = string.Empty;
 
+    public bool ShowTitle { get; private set; }
+
+    public bool ShowSubtitle { get; private set; }
+
+    public bool LayoutShowsTitle
+    {
+        get;
+        set
+        {
+            if (SetProperty(ref field, value))
+            {
+                UpdateShowsTitle();
+            }
+        }
+    }
+
+    public bool LayoutShowsSubtitle
+    {
+        get;
+        set
+        {
+            if (SetProperty(ref field, value))
+            {
+                UpdateShowsSubtitle();
+            }
+        }
+    }
+
+    public ListItemViewModel(IListItem model, WeakReference<IPageContext> context)
+        : base(new(model), context)
+    {
+        Model = new ExtensionObject<IListItem>(model);
+    }
+
     public override void InitializeProperties()
     {
         if (IsInitialized)
@@ -93,16 +126,18 @@ public partial class ListItemViewModel(IListItem model, WeakReference<IPageConte
 
         switch (propertyName)
         {
-            case nameof(Tags):
+            case nameof(model.Tags):
                 UpdateTags(model.Tags);
                 break;
-            case nameof(TextToSuggest):
-                this.TextToSuggest = model.TextToSuggest ?? string.Empty;
+            case nameof(model.TextToSuggest):
+                TextToSuggest = model.TextToSuggest ?? string.Empty;
+                UpdateProperty(nameof(TextToSuggest));
                 break;
-            case nameof(Section):
-                this.Section = model.Section ?? string.Empty;
+            case nameof(model.Section):
+                Section = model.Section ?? string.Empty;
+                UpdateProperty(nameof(Section));
                 break;
-            case nameof(Details):
+            case nameof(model.Details):
                 var extensionDetails = model.Details;
                 Details = extensionDetails is not null ? new(extensionDetails, PageContext) : null;
                 Details?.InitializeProperties();
@@ -110,16 +145,24 @@ public partial class ListItemViewModel(IListItem model, WeakReference<IPageConte
                 UpdateProperty(nameof(HasDetails));
                 UpdateShowDetailsCommand();
                 break;
-            case nameof(MoreCommands):
+            case nameof(model.MoreCommands):
+                UpdateProperty(nameof(MoreCommands));
                 AddShowDetailsCommands();
                 break;
-            case nameof(Title):
-            case nameof(Subtitle):
+            case nameof(model.Title):
+                UpdateProperty(nameof(Title));
+                UpdateShowsTitle();
                 UpdateAccessibleName();
                 break;
+            case nameof(model.Subtitle):
+                UpdateProperty(nameof(Subtitle));
+                UpdateShowsSubtitle();
+                UpdateAccessibleName();
+                break;
+            default:
+                UpdateProperty(propertyName);
+                break;
         }
-
-        UpdateProperty(propertyName);
     }
 
     // TODO: Do we want filters to match descriptions and other properties? Tags, etc... Yes?
@@ -206,11 +249,32 @@ public partial class ListItemViewModel(IListItem model, WeakReference<IPageConte
                 // many COM exception issues.
                 Tags = [.. newTags];
 
-                UpdateProperty(nameof(Tags));
-                UpdateProperty(nameof(HasTags));
+                // We're already in UI thread, so just raise the events
+                OnPropertyChanged(nameof(Tags));
+                OnPropertyChanged(nameof(HasTags));
             });
     }
 
+    private void UpdateShowsTitle()
+    {
+        var oldShowTitle = ShowTitle;
+        ShowTitle = LayoutShowsTitle;
+        if (oldShowTitle != ShowTitle)
+        {
+            UpdateProperty(nameof(ShowTitle));
+        }
+    }
+
+    private void UpdateShowsSubtitle()
+    {
+        var oldShowSubtitle = ShowSubtitle;
+        ShowSubtitle = LayoutShowsSubtitle && !string.IsNullOrWhiteSpace(Subtitle);
+        if (oldShowSubtitle != ShowSubtitle)
+        {
+            UpdateProperty(nameof(ShowSubtitle));
+        }
+    }
+
     protected override void UnsafeCleanup()
     {
         base.UnsafeCleanup();

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

@@ -24,8 +24,7 @@ public partial class ListViewModel : PageViewModel, IDisposable
 
     // Observable from MVVM Toolkit will auto create public properties that use INotifyPropertyChange change
     // https://learn.microsoft.com/dotnet/communitytoolkit/mvvm/observablegroupedcollections for grouping support
-    [ObservableProperty]
-    public partial ObservableCollection<ListItemViewModel> FilteredItems { get; set; } = [];
+    public ObservableCollection<ListItemViewModel> FilteredItems { get; } = [];
 
     public FiltersViewModel? Filters { get; set; }
 
@@ -224,6 +223,8 @@ public partial class ListViewModel : PageViewModel, IDisposable
             // TODO we can probably further optimize this by also keeping a
             // HashSet of every ExtensionObject we currently have, and only
             // building new viewmodels for the ones we haven't already built.
+            var showsTitle = GridProperties?.ShowTitle ?? true;
+            var showsSubtitle = GridProperties?.ShowSubtitle ?? true;
             foreach (var item in newItems)
             {
                 // Check for cancellation during item processing
@@ -237,6 +238,8 @@ public partial class ListViewModel : PageViewModel, IDisposable
                 // If an item fails to load, silently ignore it.
                 if (viewModel.SafeFastInit())
                 {
+                    viewModel.LayoutShowsTitle = showsTitle;
+                    viewModel.LayoutShowsSubtitle = showsSubtitle;
                     newViewModels.Add(viewModel);
                 }
             }
@@ -583,6 +586,7 @@ public partial class ListViewModel : PageViewModel, IDisposable
         GridProperties = LoadGridPropertiesViewModel(model.GridProperties);
         GridProperties?.InitializeProperties();
         UpdateProperty(nameof(GridProperties));
+        ApplyLayoutToItems();
 
         ShowDetails = model.ShowDetails;
         UpdateProperty(nameof(ShowDetails));
@@ -608,22 +612,15 @@ public partial class ListViewModel : PageViewModel, IDisposable
         model.ItemsChanged += Model_ItemsChanged;
     }
 
-    private IGridPropertiesViewModel? LoadGridPropertiesViewModel(IGridProperties? gridProperties)
+    private static IGridPropertiesViewModel? LoadGridPropertiesViewModel(IGridProperties? gridProperties)
     {
-        if (gridProperties is IMediumGridLayout mediumGridLayout)
+        return gridProperties switch
         {
-            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;
+            IMediumGridLayout mediumGridLayout => new MediumGridPropertiesViewModel(mediumGridLayout),
+            IGalleryGridLayout galleryGridLayout => new GalleryGridPropertiesViewModel(galleryGridLayout),
+            ISmallGridLayout smallGridLayout => new SmallGridPropertiesViewModel(smallGridLayout),
+            _ => null,
+        };
     }
 
     public void LoadMoreIfNeeded()
@@ -685,6 +682,7 @@ public partial class ListViewModel : PageViewModel, IDisposable
                 GridProperties = LoadGridPropertiesViewModel(model.GridProperties);
                 GridProperties?.InitializeProperties();
                 UpdateProperty(nameof(IsGridView));
+                ApplyLayoutToItems();
                 break;
             case nameof(ShowDetails):
                 ShowDetails = model.ShowDetails;
@@ -730,6 +728,21 @@ public partial class ListViewModel : PageViewModel, IDisposable
            });
     }
 
+    private void ApplyLayoutToItems()
+    {
+        lock (_listLock)
+        {
+            var showsTitle = GridProperties?.ShowTitle ?? true;
+            var showsSubtitle = GridProperties?.ShowSubtitle ?? true;
+
+            foreach (var item in Items)
+            {
+                item.LayoutShowsTitle = showsTitle;
+                item.LayoutShowsSubtitle = showsSubtitle;
+            }
+        }
+    }
+
     public void Dispose()
     {
         GC.SuppressFinalize(this);

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

@@ -11,13 +11,15 @@ public class MediumGridPropertiesViewModel : IGridPropertiesViewModel
 {
     private readonly ExtensionObject<IMediumGridLayout> _model;
 
+    public bool ShowTitle { get; private set; }
+
+    public bool ShowSubtitle => false;
+
     public MediumGridPropertiesViewModel(IMediumGridLayout mediumGridLayout)
     {
         _model = new(mediumGridLayout);
     }
 
-    public bool ShowTitle { get; set; }
-
     public void InitializeProperties()
     {
         var model = _model.Unsafe;

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

@@ -11,6 +11,10 @@ public class SmallGridPropertiesViewModel : IGridPropertiesViewModel
 {
     private readonly ExtensionObject<ISmallGridLayout> _model;
 
+    public bool ShowTitle => false;
+
+    public bool ShowSubtitle => false;
+
     public SmallGridPropertiesViewModel(ISmallGridLayout smallGridLayout)
     {
         _model = new(smallGridLayout);

src/modules/cmdpal/Microsoft.CmdPal.UI/Converters/GridItemContainerStyleSelector.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;
+using Microsoft.UI.Xaml;
+using Microsoft.UI.Xaml.Controls;
+
+namespace Microsoft.CmdPal.UI;
+
+internal sealed partial class GridItemContainerStyleSelector : StyleSelector
+{
+    public IGridPropertiesViewModel? GridProperties { get; set; }
+
+    public Style? Small { get; set; }
+
+    public Style? Medium { get; set; }
+
+    public Style? Gallery { get; set; }
+
+    protected override Style? SelectStyleCore(object item, DependencyObject container)
+    {
+        return GridProperties switch
+        {
+            SmallGridPropertiesViewModel => Small,
+            MediumGridPropertiesViewModel => Medium,
+            GalleryGridPropertiesViewModel => Gallery,
+            _ => Medium,
+        };
+    }
+}

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

@@ -20,21 +20,12 @@ internal sealed partial class GridItemTemplateSelector : DataTemplateSelector
 
     protected override DataTemplate? SelectTemplateCore(object item, DependencyObject dependencyObject)
     {
-        DataTemplate? dataTemplate = Medium;
-
-        if (GridProperties is SmallGridPropertiesViewModel)
+        return GridProperties switch
         {
-            dataTemplate = Small;
-        }
-        else if (GridProperties is MediumGridPropertiesViewModel)
-        {
-            dataTemplate = Medium;
-        }
-        else if (GridProperties is GalleryGridPropertiesViewModel)
-        {
-            dataTemplate = Gallery;
-        }
-
-        return dataTemplate;
+            SmallGridPropertiesViewModel => Small,
+            MediumGridPropertiesViewModel => Medium,
+            GalleryGridPropertiesViewModel => Gallery,
+            _ => Medium,
+        };
     }
 }

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

@@ -5,33 +5,151 @@
     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"
     xmlns:cpcontrols="using:Microsoft.CmdPal.UI.Controls"
     xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
     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>
-        <!--  TODO: Figure out what we want to do here for filtering/grouping and where  -->
-        <!--  https://learn.microsoft.com/windows/windows-app-sdk/api/winrt/microsoft.ui.xaml.data.collectionviewsource  -->
-        <!--<CollectionViewSource
-            x:Name="ItemsCVS"
-            IsSourceGrouped="True"
-            Source="{x:Bind ViewModel.Items, Mode=OneWay}" />-->
 
-        <converters:BoolToVisibilityConverter x:Key="BoolToVisibilityConverter" />
-        <converters:StringVisibilityConverter
-            x:Key="StringVisibilityConverter"
-            EmptyValue="Collapsed"
-            NotEmptyValue="Visible" />
+        <!--
+            GridViewItemCornerRadius is the corner radius defined in GridView template; make
+            it bigger to match the radii of the gallery
+        -->
+        <CornerRadius x:Key="GalleryGridViewItemContainerCornerRadius">6</CornerRadius>
+        <CornerRadius x:Key="IconGridViewItemContainerCornerRadius">4</CornerRadius>
+        <CornerRadius x:Key="GalleryGridViewItemRadius">4</CornerRadius>
+        <CornerRadius x:Key="SmallGridViewItemCornerRadius">8</CornerRadius>
+        <CornerRadius x:Key="MediumGridViewItemCornerRadius">8</CornerRadius>
+
+        <Style x:Key="IconGridViewItemStyle" TargetType="GridViewItem">
+            <Setter Property="Template">
+                <Setter.Value>
+                    <ControlTemplate TargetType="GridViewItem">
+                        <ListViewItemPresenter
+                            x:Name="Root"
+                            HorizontalContentAlignment="{TemplateBinding HorizontalContentAlignment}"
+                            VerticalContentAlignment="{TemplateBinding VerticalContentAlignment}"
+                            CheckBoxBorderBrush="{ThemeResource GridViewItemCheckBoxBorderBrush}"
+                            CheckBoxBrush="{ThemeResource GridViewItemCheckBoxBrush}"
+                            CheckBoxCornerRadius="{ThemeResource GridViewItemCheckBoxCornerRadius}"
+                            CheckBoxDisabledBorderBrush="{ThemeResource GridViewItemCheckBoxDisabledBorderBrush}"
+                            CheckBoxDisabledBrush="{ThemeResource GridViewItemCheckBoxDisabledBrush}"
+                            CheckBoxPointerOverBorderBrush="{ThemeResource GridViewItemCheckBoxPointerOverBorderBrush}"
+                            CheckBoxPointerOverBrush="{ThemeResource GridViewItemCheckBoxPointerOverBrush}"
+                            CheckBoxPressedBorderBrush="{ThemeResource GridViewItemCheckBoxPressedBorderBrush}"
+                            CheckBoxPressedBrush="{ThemeResource GridViewItemCheckBoxPressedBrush}"
+                            CheckBoxSelectedBrush="{ThemeResource GridViewItemCheckBoxSelectedBrush}"
+                            CheckBoxSelectedDisabledBrush="{ThemeResource GridViewItemCheckBoxSelectedDisabledBrush}"
+                            CheckBoxSelectedPointerOverBrush="{ThemeResource GridViewItemCheckBoxSelectedPointerOverBrush}"
+                            CheckBoxSelectedPressedBrush="{ThemeResource GridViewItemCheckBoxSelectedPressedBrush}"
+                            CheckBrush="{ThemeResource GridViewItemCheckBrush}"
+                            CheckDisabledBrush="{ThemeResource GridViewItemCheckDisabledBrush}"
+                            CheckMode="{ThemeResource GridViewItemCheckMode}"
+                            CheckPressedBrush="{ThemeResource GridViewItemCheckPressedBrush}"
+                            ContentMargin="{TemplateBinding Padding}"
+                            ContentTransitions="{TemplateBinding ContentTransitions}"
+                            Control.IsTemplateFocusTarget="True"
+                            CornerRadius="{StaticResource IconGridViewItemContainerCornerRadius}"
+                            DisabledOpacity="{ThemeResource ListViewItemDisabledThemeOpacity}"
+                            DragBackground="{ThemeResource GridViewItemDragBackground}"
+                            DragForeground="{ThemeResource GridViewItemDragForeground}"
+                            DragOpacity="{ThemeResource ListViewItemDragThemeOpacity}"
+                            FocusBorderBrush="{ThemeResource GridViewItemFocusBorderBrush}"
+                            FocusVisualMargin="{TemplateBinding FocusVisualMargin}"
+                            FocusVisualPrimaryBrush="{TemplateBinding FocusVisualPrimaryBrush}"
+                            FocusVisualPrimaryThickness="{TemplateBinding FocusVisualPrimaryThickness}"
+                            FocusVisualSecondaryBrush="{TemplateBinding FocusVisualSecondaryBrush}"
+                            FocusVisualSecondaryThickness="{TemplateBinding FocusVisualSecondaryThickness}"
+                            PlaceholderBackground="{ThemeResource GridViewItemPlaceholderBackground}"
+                            PointerOverBackground="{ThemeResource GridViewItemBackgroundPointerOver}"
+                            PointerOverBorderBrush="{ThemeResource GridViewItemPointerOverBorderBrush}"
+                            PointerOverForeground="{ThemeResource GridViewItemForegroundPointerOver}"
+                            PressedBackground="{ThemeResource GridViewItemBackgroundPressed}"
+                            ReorderHintOffset="{ThemeResource GridViewItemReorderHintThemeOffset}"
+                            SelectedBackground="{ThemeResource GridViewItemBackgroundSelected}"
+                            SelectedBorderBrush="{ThemeResource GridViewItemSelectedBorderBrush}"
+                            SelectedBorderThickness="{ThemeResource GridViewItemSelectedBorderThickness}"
+                            SelectedDisabledBackground="{ThemeResource GridViewItemBackgroundSelectedDisabled}"
+                            SelectedDisabledBorderBrush="{ThemeResource GridViewItemSelectedDisabledBorderBrush}"
+                            SelectedForeground="{ThemeResource GridViewItemForegroundSelected}"
+                            SelectedInnerBorderBrush="{ThemeResource GridViewItemSelectedInnerBorderBrush}"
+                            SelectedPointerOverBackground="{ThemeResource GridViewItemBackgroundSelectedPointerOver}"
+                            SelectedPointerOverBorderBrush="{ThemeResource GridViewItemSelectedPointerOverBorderBrush}"
+                            SelectedPressedBackground="{ThemeResource GridViewItemBackgroundSelectedPressed}"
+                            SelectedPressedBorderBrush="{ThemeResource GridViewItemSelectedPressedBorderBrush}"
+                            SelectionCheckMarkVisualEnabled="{ThemeResource GridViewItemSelectionCheckMarkVisualEnabled}" />
+                    </ControlTemplate>
+                </Setter.Value>
+            </Setter>
+        </Style>
+
+        <Style x:Key="GalleryGridViewItemStyle" TargetType="GridViewItem">
+            <Setter Property="Template">
+                <Setter.Value>
+                    <ControlTemplate TargetType="GridViewItem">
+                        <ListViewItemPresenter
+                            x:Name="Root"
+                            HorizontalContentAlignment="{TemplateBinding HorizontalContentAlignment}"
+                            VerticalContentAlignment="{TemplateBinding VerticalContentAlignment}"
+                            CheckBoxBorderBrush="{ThemeResource GridViewItemCheckBoxBorderBrush}"
+                            CheckBoxBrush="{ThemeResource GridViewItemCheckBoxBrush}"
+                            CheckBoxCornerRadius="{ThemeResource GridViewItemCheckBoxCornerRadius}"
+                            CheckBoxDisabledBorderBrush="{ThemeResource GridViewItemCheckBoxDisabledBorderBrush}"
+                            CheckBoxDisabledBrush="{ThemeResource GridViewItemCheckBoxDisabledBrush}"
+                            CheckBoxPointerOverBorderBrush="{ThemeResource GridViewItemCheckBoxPointerOverBorderBrush}"
+                            CheckBoxPointerOverBrush="{ThemeResource GridViewItemCheckBoxPointerOverBrush}"
+                            CheckBoxPressedBorderBrush="{ThemeResource GridViewItemCheckBoxPressedBorderBrush}"
+                            CheckBoxPressedBrush="{ThemeResource GridViewItemCheckBoxPressedBrush}"
+                            CheckBoxSelectedBrush="{ThemeResource GridViewItemCheckBoxSelectedBrush}"
+                            CheckBoxSelectedDisabledBrush="{ThemeResource GridViewItemCheckBoxSelectedDisabledBrush}"
+                            CheckBoxSelectedPointerOverBrush="{ThemeResource GridViewItemCheckBoxSelectedPointerOverBrush}"
+                            CheckBoxSelectedPressedBrush="{ThemeResource GridViewItemCheckBoxSelectedPressedBrush}"
+                            CheckBrush="{ThemeResource GridViewItemCheckBrush}"
+                            CheckDisabledBrush="{ThemeResource GridViewItemCheckDisabledBrush}"
+                            CheckMode="{ThemeResource GridViewItemCheckMode}"
+                            CheckPressedBrush="{ThemeResource GridViewItemCheckPressedBrush}"
+                            ContentMargin="{TemplateBinding Padding}"
+                            ContentTransitions="{TemplateBinding ContentTransitions}"
+                            Control.IsTemplateFocusTarget="True"
+                            CornerRadius="{StaticResource GalleryGridViewItemContainerCornerRadius}"
+                            DisabledOpacity="{ThemeResource ListViewItemDisabledThemeOpacity}"
+                            DragBackground="{ThemeResource GridViewItemDragBackground}"
+                            DragForeground="{ThemeResource GridViewItemDragForeground}"
+                            DragOpacity="{ThemeResource ListViewItemDragThemeOpacity}"
+                            FocusBorderBrush="{ThemeResource GridViewItemFocusBorderBrush}"
+                            FocusVisualMargin="{TemplateBinding FocusVisualMargin}"
+                            FocusVisualPrimaryBrush="{TemplateBinding FocusVisualPrimaryBrush}"
+                            FocusVisualPrimaryThickness="{TemplateBinding FocusVisualPrimaryThickness}"
+                            FocusVisualSecondaryBrush="{TemplateBinding FocusVisualSecondaryBrush}"
+                            FocusVisualSecondaryThickness="{TemplateBinding FocusVisualSecondaryThickness}"
+                            PlaceholderBackground="{ThemeResource GridViewItemPlaceholderBackground}"
+                            PointerOverBackground="{ThemeResource GridViewItemBackgroundPointerOver}"
+                            PointerOverBorderBrush="{ThemeResource GridViewItemPointerOverBorderBrush}"
+                            PointerOverForeground="{ThemeResource GridViewItemForegroundPointerOver}"
+                            PressedBackground="{ThemeResource GridViewItemBackgroundPressed}"
+                            ReorderHintOffset="{ThemeResource GridViewItemReorderHintThemeOffset}"
+                            SelectedBackground="{ThemeResource GridViewItemBackgroundSelected}"
+                            SelectedBorderBrush="{ThemeResource GridViewItemSelectedBorderBrush}"
+                            SelectedBorderThickness="{ThemeResource GridViewItemSelectedBorderThickness}"
+                            SelectedDisabledBackground="{ThemeResource GridViewItemBackgroundSelectedDisabled}"
+                            SelectedDisabledBorderBrush="{ThemeResource GridViewItemSelectedDisabledBorderBrush}"
+                            SelectedForeground="{ThemeResource GridViewItemForegroundSelected}"
+                            SelectedInnerBorderBrush="{ThemeResource GridViewItemSelectedInnerBorderBrush}"
+                            SelectedPointerOverBackground="{ThemeResource GridViewItemBackgroundSelectedPointerOver}"
+                            SelectedPointerOverBorderBrush="{ThemeResource GridViewItemSelectedPointerOverBorderBrush}"
+                            SelectedPressedBackground="{ThemeResource GridViewItemBackgroundSelectedPressed}"
+                            SelectedPressedBorderBrush="{ThemeResource GridViewItemSelectedPressedBorderBrush}"
+                            SelectionCheckMarkVisualEnabled="{ThemeResource GridViewItemSelectionCheckMarkVisualEnabled}" />
+                    </ControlTemplate>
+                </Setter.Value>
+            </Setter>
+        </Style>
 
         <DataTemplate x:Key="TagTemplate" x:DataType="coreViewModels:TagViewModel">
             <cpcontrols:Tag
@@ -48,10 +166,17 @@
             x:Key="GridItemTemplateSelector"
             x:DataType="coreViewModels:ListItemViewModel"
             Gallery="{StaticResource GalleryGridItemViewModelTemplate}"
-            GridProperties="{x:Bind ViewModel.GridProperties}"
+            GridProperties="{x:Bind ViewModel.GridProperties, Mode=OneWay}"
             Medium="{StaticResource MediumGridItemViewModelTemplate}"
             Small="{StaticResource SmallGridItemViewModelTemplate}" />
 
+        <cmdpalUI:GridItemContainerStyleSelector
+            x:Key="GridItemContainerStyleSelector"
+            Gallery="{StaticResource GalleryGridViewItemStyle}"
+            GridProperties="{x:Bind ViewModel.GridProperties, Mode=OneWay}"
+            Medium="{StaticResource IconGridViewItemStyle}"
+            Small="{StaticResource IconGridViewItemStyle}" />
+
         <!--  https://learn.microsoft.com/windows/apps/design/controls/itemsview#specify-the-look-of-the-items  -->
         <DataTemplate x:Key="ListItemViewModelTemplate" x:DataType="coreViewModels:ListItemViewModel">
             <Grid
@@ -94,7 +219,7 @@
                         Text="{x:Bind Subtitle, Mode=OneWay}"
                         TextTrimming="CharacterEllipsis"
                         TextWrapping="NoWrap"
-                        Visibility="{x:Bind Subtitle, Mode=OneWay, Converter={StaticResource StringVisibilityConverter}}" />
+                        Visibility="{x:Bind ShowSubtitle, Mode=OneWay}" />
                 </StackPanel>
 
                 <ItemsControl
@@ -124,11 +249,11 @@
                 Padding="8,16"
                 HorizontalAlignment="Center"
                 VerticalAlignment="Center"
-                AutomationProperties.Name="{x:Bind Title}"
+                AutomationProperties.Name="{x:Bind Title, Mode=OneWay}"
                 BorderThickness="0"
-                CornerRadius="8"
+                CornerRadius="{StaticResource SmallGridViewItemCornerRadius}"
                 Orientation="Vertical"
-                ToolTipService.ToolTip="{x:Bind Title}">
+                ToolTipService.ToolTip="{x:Bind Title, Mode=OneWay}">
 
                 <cpcontrols:IconBox
                     x:Name="GridIconBorder"
@@ -145,23 +270,22 @@
         </DataTemplate>
 
         <DataTemplate x:Key="MediumGridItemViewModelTemplate" x:DataType="coreViewModels:ListItemViewModel">
-            <StackPanel
+            <Grid
                 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}">
-
+                Padding="8"
+                AutomationProperties.Name="{x:Bind Title, Mode=OneWay}"
+                CornerRadius="{StaticResource MediumGridViewItemCornerRadius}"
+                ToolTipService.ToolTip="{x:Bind Title, Mode=OneWay}">
+                <Grid.RowDefinitions>
+                    <RowDefinition Height="*" />
+                    <RowDefinition Height="Auto" />
+                </Grid.RowDefinitions>
                 <cpcontrols:IconBox
                     x:Name="GridIconBorder"
+                    Grid.Row="0"
                     Width="36"
                     Height="36"
-                    Margin="0"
                     HorizontalAlignment="Center"
                     VerticalAlignment="Center"
                     CharacterSpacing="12"
@@ -169,21 +293,20 @@
                     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"
+                    Grid.Row="1"
+                    Height="32"
+                    Margin="0,8,0,0"
                     HorizontalAlignment="Center"
-                    VerticalAlignment="Center"
                     CharacterSpacing="12"
                     FontSize="12"
-                    Text="{x:Bind Title}"
+                    Text="{x:Bind Title, Mode=OneWay}"
                     TextAlignment="Center"
                     TextTrimming="WordEllipsis"
                     TextWrapping="Wrap"
-                    Visibility="{Binding ElementName=PageRoot, Path=DataContext.GridProperties.ShowTitle, Mode=OneWay, Converter={StaticResource BoolToVisibilityConverter}}" />
-            </StackPanel>
+                    Visibility="{x:Bind LayoutShowsTitle, Mode=OneWay}" />
+            </Grid>
         </DataTemplate>
 
         <DataTemplate x:Key="GalleryGridItemViewModelTemplate" x:DataType="coreViewModels:ListItemViewModel">
@@ -193,11 +316,11 @@
                 Padding="0"
                 HorizontalAlignment="Center"
                 VerticalAlignment="Center"
-                AutomationProperties.Name="{x:Bind Title}"
+                AutomationProperties.Name="{x:Bind Title, Mode=OneWay}"
                 BorderThickness="0"
-                CornerRadius="4"
+                CornerRadius="{StaticResource GalleryGridViewItemRadius}"
                 Orientation="Vertical"
-                ToolTipService.ToolTip="{x:Bind Title}">
+                ToolTipService.ToolTip="{x:Bind Title, Mode=OneWay}">
 
                 <Grid
                     Width="160"
@@ -205,12 +328,8 @@
                     Margin="0"
                     HorizontalAlignment="Center"
                     VerticalAlignment="Center"
-                    CornerRadius="4">
-                    <Grid.RowDefinitions>
-                        <RowDefinition />
-                    </Grid.RowDefinitions>
+                    CornerRadius="{StaticResource GalleryGridViewItemRadius}">
                     <Viewbox
-                        Grid.Row="1"
                         HorizontalAlignment="Center"
                         Stretch="UniformToFill"
                         StretchDirection="Both">
@@ -222,35 +341,39 @@
                     </Viewbox>
                 </Grid>
 
-                <StackPanel Padding="4" Orientation="Vertical">
+                <StackPanel
+                    Padding="4"
+                    Orientation="Vertical"
+                    Spacing="4"
+                    Visibility="{x:Bind help:BindTransformers.VisibleWhenAny(ShowTitle, ShowSubtitle)}">
                     <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}"
+                        Text="{x:Bind Title, Mode=OneWay}"
                         TextAlignment="Center"
                         TextTrimming="WordEllipsis"
-                        TextWrapping="NoWrap" />
+                        TextWrapping="NoWrap"
+                        Visibility="{x:Bind ShowTitle, Mode=OneWay}" />
                     <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}"
+                        Text="{x:Bind Subtitle, Mode=OneWay}"
                         TextAlignment="Center"
                         TextTrimming="WordEllipsis"
-                        TextWrapping="NoWrap" />
+                        TextWrapping="NoWrap"
+                        Visibility="{x:Bind ShowSubtitle, Mode=OneWay}" />
                 </StackPanel>
             </StackPanel>
         </DataTemplate>
@@ -295,6 +418,7 @@
                             IsDoubleTapEnabled="True"
                             IsItemClickEnabled="True"
                             ItemClick="Items_ItemClick"
+                            ItemContainerStyleSelector="{StaticResource GridItemContainerStyleSelector}"
                             ItemTemplateSelector="{StaticResource GridItemTemplateSelector}"
                             ItemsSource="{x:Bind ViewModel.FilteredItems, Mode=OneWay}"
                             RightTapped="Items_RightTapped"
@@ -302,6 +426,7 @@
                             <GridView.ItemContainerTransitions>
                                 <TransitionCollection />
                             </GridView.ItemContainerTransitions>
+                            <GridView.ItemContainerStyle />
                         </GridView>
                     </controls:Case>
                 </controls:SwitchPresenter>

src/modules/cmdpal/Microsoft.CmdPal.UI/Helpers/BindTransformers.cs

@@ -15,4 +15,7 @@ internal static class BindTransformers
 
     public static Visibility EmptyOrWhitespaceToCollapsed(string? input)
         => string.IsNullOrWhiteSpace(input) ? Visibility.Collapsed : Visibility.Visible;
+
+    public static Visibility VisibleWhenAny(bool value1, bool value2)
+        => (value1 || value2) ? Visibility.Visible : Visibility.Collapsed;
 }

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

@@ -9,13 +9,6 @@ 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 [

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

@@ -0,0 +1,59 @@
+// 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 SampleGridsListPage : ListPage
+{
+    private readonly IListItem[] _items =
+    [
+        new ListItem(new SampleGalleryListPage { GridProperties = new GalleryGridLayout { ShowTitle = true, ShowSubtitle = true } })
+        {
+            Title = "Gallery list page (title and subtitle)",
+            Subtitle = "A sample gallery list page with images",
+            Icon = IconHelpers.FromRelativePath("Assets/Images/Swirls.png"),
+        },
+        new ListItem(new SampleGalleryListPage { GridProperties = new GalleryGridLayout { ShowTitle = true, ShowSubtitle = false } })
+        {
+            Title = "Gallery list page (title, no subtitle)",
+            Subtitle = "A sample gallery list page with images",
+            Icon = IconHelpers.FromRelativePath("Assets/Images/Swirls.png"),
+        },
+        new ListItem(new SampleGalleryListPage { GridProperties = new GalleryGridLayout { ShowTitle = false, ShowSubtitle = false } })
+        {
+            Title = "Gallery list page (no title, no subtitle)",
+            Subtitle = "A sample gallery list page with images",
+            Icon = IconHelpers.FromRelativePath("Assets/Images/Swirls.png"),
+        },
+        new ListItem(new SampleGalleryListPage { GridProperties = new SmallGridLayout() })
+        {
+            Title = "Small grid list page",
+            Subtitle = "A sample grid list page with text items",
+            Icon = IconHelpers.FromRelativePath("Assets/Images/Win-Digital.png"),
+        },
+        new ListItem(new SampleGalleryListPage { GridProperties = new MediumGridLayout { ShowTitle = true } })
+        {
+            Title = "Medium grid (with title)",
+            Subtitle = "A sample grid list page with text items",
+            Icon = IconHelpers.FromRelativePath("Assets/Images/Win-Digital.png"),
+        },
+        new ListItem(new SampleGalleryListPage { GridProperties = new MediumGridLayout { ShowTitle = false } })
+        {
+            Title = "Medium grid (hidden title)",
+            Subtitle = "A sample grid list page with text items",
+            Icon = IconHelpers.FromRelativePath("Assets/Images/Win-Digital.png"),
+        }
+    ];
+
+    public SampleGridsListPage()
+    {
+        Icon = new IconInfo("\uE7C5");
+        Name = "Grid and gallery lists";
+    }
+
+    public override IListItem[] GetItems() => _items;
+}

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

@@ -34,9 +34,9 @@ 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())
+        new ListItem(new SampleGridsListPage())
         {
-            Title = "Gallery List Page Command",
+            Title = "Grid views and galleries",
             Subtitle = "Displays items as a gallery",
         },
         new ListItem(new OnLoadPage())