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Code Quality: Removed ISidebarViewModel #17972

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0c7408a
Update the UI automation classes
0x5bfa Dec 18, 2025
314d8a3
Removed ISidebarViewModel
0x5bfa Dec 18, 2025
8cbdfc4
Revert the DP changes
0x5bfa Dec 19, 2025
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37 changes: 1 addition & 36 deletions src/Files.App.Controls/Sidebar/ISidebarViewModel.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -7,43 +7,8 @@

namespace Files.App.Controls
{
public record ItemInvokedEventArgs(PointerUpdateKind PointerUpdateKind) { }
public record ItemDroppedEventArgs(object DropTarget, DataPackageView DroppedItem, SidebarItemDropPosition dropPosition, DragEventArgs RawEvent) { }
public record ItemDragOverEventArgs(object DropTarget, DataPackageView DroppedItem, SidebarItemDropPosition dropPosition, DragEventArgs RawEvent) { }
public record ItemContextInvokedArgs(object? Item, Point Position) { }

public interface ISidebarViewModel
{
/// <summary>
/// The source/list of items that will be rendered in the sidebar
/// </summary>
object SidebarItems { get; }

/// <summary>
/// Gets invoked when the context was requested for an item in the sidebar.
/// Also applies when context was requested for the pane itsself.
/// </summary>
/// <param name="sender">The sender of this event</param>
/// <param name="args">The <see cref="ItemContextInvokedArgs"/> for this event.</param>
void HandleItemContextInvokedAsync(object sender, ItemContextInvokedArgs args);

/// <summary>
/// Gets invoked when an item drags over any item of the sidebar.
/// </summary>
/// <param name="args">The <see cref="ItemDragOverEventArgs"/> for this event.</param>
/// <returns>A <see cref="Task"/> that represents the asynchronous operation.</returns>
Task HandleItemDragOverAsync(ItemDragOverEventArgs args);

/// <summary>
/// Gets invoked when an item is dropped on any item of the sidebar.
/// </summary>
/// <param name="args">The <see cref="ItemDroppedEventArgs"/> for this event.</param>
/// <returns>A <see cref="Task"/> that represents the asynchronous operation.</returns>
Task HandleItemDroppedAsync(ItemDroppedEventArgs args);

/// <summary>
/// Gets invoked when an item is invoked (double clicked) on any item of the sidebar.
/// </summary>
/// <param name="item">The item that was invoked.</param>
void HandleItemInvokedAsync(object item, PointerUpdateKind pointerUpdateKind);
}
}
12 changes: 3 additions & 9 deletions src/Files.App.Controls/Sidebar/SidebarItem.cs
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Expand Up @@ -404,12 +404,7 @@ private async void ItemBorder_DragOver(object sender, DragEventArgs e)
VisualStateManager.GoToState(this, "DragInsertBelow", true);
}

if (Owner is not null)
{
var deferral = e.GetDeferral();
await Owner.RaiseItemDragOver(this, insertsAbove, e);
deferral.Complete();
}
Owner?.RaiseItemDragOver(this, insertsAbove, e);
}

private void ItemBorder_ContextRequested(UIElement sender, Microsoft.UI.Xaml.Input.ContextRequestedEventArgs args)
Expand All @@ -423,11 +418,10 @@ private void ItemBorder_DragLeave(object sender, DragEventArgs e)
UpdatePointerState();
}

private async void ItemBorder_Drop(object sender, DragEventArgs e)
private void ItemBorder_Drop(object sender, DragEventArgs e)
{
UpdatePointerState();
if (Owner is not null)
await Owner.RaiseItemDropped(this, DetermineDropTargetPosition(e), e);
Owner?.RaiseItemDropped(this, DetermineDropTargetPosition(e), e);
}

private SidebarItemDropPosition DetermineDropTargetPosition(DragEventArgs args)
Expand Down
22 changes: 9 additions & 13 deletions src/Files.App.Controls/Sidebar/SidebarItemAutomationPeer.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -9,6 +9,9 @@

namespace Files.App.Controls
{
/// <summary>
/// Exposes <see cref="SidebarItem"/> types to Microsoft UI Automation.
/// </summary>
public sealed partial class SidebarItemAutomationPeer : FrameworkElementAutomationPeer, IInvokeProvider, IExpandCollapseProvider, ISelectionItemProvider
{
public ExpandCollapseState ExpandCollapseState
Expand All @@ -17,6 +20,7 @@ public ExpandCollapseState ExpandCollapseState
{
if (Owner.HasChildren)
return Owner.IsExpanded ? ExpandCollapseState.Expanded : ExpandCollapseState.Collapsed;

return ExpandCollapseState.LeafNode;
}
}
Expand All @@ -27,7 +31,7 @@ public ExpandCollapseState ExpandCollapseState

public SidebarItemAutomationPeer(SidebarItem owner) : base(owner)
{
this.Owner = owner;
Owner = owner;
}

protected override AutomationControlType GetAutomationControlTypeCore()
Expand All @@ -49,28 +53,22 @@ protected override object GetPatternCore(PatternInterface patternInterface)
else if (patternInterface == PatternInterface.ExpandCollapse)
{
if (Owner.CollapseEnabled)
{
return this;
}
}

return base.GetPatternCore(patternInterface);
}

public void Collapse()
{
if (Owner.CollapseEnabled)
{
Owner.IsExpanded = false;
}
}

public void Expand()
{

if (Owner.CollapseEnabled)
{
Owner.IsExpanded = true;
}
}

public void Invoke()
Expand Down Expand Up @@ -106,13 +104,11 @@ protected override int GetPositionInSetCore()
private IList GetOwnerCollection()
{
if (Owner.FindAscendant<SidebarItem>() is SidebarItem parent && parent.Item?.Children is IList list)
{
return list;
}
if (Owner?.Owner is not null && Owner.Owner.ViewModel.SidebarItems is IList items)
{

if (Owner?.Owner is not null && Owner.Owner?.MenuItemsSource is IList items)
return items;
}

return new List<object>();
}
}
Expand Down
8 changes: 0 additions & 8 deletions src/Files.App.Controls/Sidebar/SidebarView.Properties.cs
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Expand Up @@ -65,14 +65,6 @@ public double NegativeOpenPaneLength
public static readonly DependencyProperty NegativeOpenPaneLengthProperty =
DependencyProperty.Register(nameof(NegativeOpenPaneLength), typeof(double), typeof(SidebarView), new PropertyMetadata(null));

public ISidebarViewModel ViewModel
{
get => (ISidebarViewModel)GetValue(ViewModelProperty);
set => SetValue(ViewModelProperty, value);
}
public static readonly DependencyProperty ViewModelProperty =
DependencyProperty.Register(nameof(ViewModel), typeof(ISidebarViewModel), typeof(SidebarView), new PropertyMetadata(null));

public ISidebarItemModel SelectedItem
{
get => (ISidebarItemModel)GetValue(SelectedItemProperty);
Expand Down
21 changes: 10 additions & 11 deletions src/Files.App.Controls/Sidebar/SidebarView.xaml.cs
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Expand Up @@ -15,8 +15,10 @@ public sealed partial class SidebarView : UserControl, INotifyPropertyChanged
{
private const double COMPACT_MAX_WIDTH = 200;

public event EventHandler<object>? ItemInvoked;
public event EventHandler<ItemInvokedEventArgs>? ItemInvoked;
public event EventHandler<ItemContextInvokedArgs>? ItemContextInvoked;
public event EventHandler<ItemDragOverEventArgs>? ItemDragOver;
public event EventHandler<ItemDroppedEventArgs>? ItemDropped;
public event PropertyChangedEventHandler? PropertyChanged;

internal SidebarItem? SelectedItemContainer = null;
Expand All @@ -40,26 +42,24 @@ internal void RaiseItemInvoked(SidebarItem item, PointerUpdateKind pointerUpdate
if (item.Item is null || item.IsGroupHeader) return;

SelectedItem = item.Item;
ItemInvoked?.Invoke(item, item.Item);
ViewModel.HandleItemInvokedAsync(item.Item, pointerUpdateKind);
ItemInvoked?.Invoke(item, new(pointerUpdateKind));
}

internal void RaiseContextRequested(SidebarItem item, Point e)
{
ItemContextInvoked?.Invoke(item, new ItemContextInvokedArgs(item.Item, e));
ViewModel.HandleItemContextInvokedAsync(item, new ItemContextInvokedArgs(item.Item, e));
ItemContextInvoked?.Invoke(item, new(item.Item, e));
}

internal async Task RaiseItemDropped(SidebarItem sideBarItem, SidebarItemDropPosition dropPosition, DragEventArgs rawEvent)
internal void RaiseItemDropped(SidebarItem sideBarItem, SidebarItemDropPosition dropPosition, DragEventArgs rawEvent)
{
if (sideBarItem.Item is null) return;
await ViewModel.HandleItemDroppedAsync(new ItemDroppedEventArgs(sideBarItem.Item, rawEvent.DataView, dropPosition, rawEvent));
ItemDropped?.Invoke(this, new(sideBarItem.Item, rawEvent.DataView, dropPosition, rawEvent));
}

internal async Task RaiseItemDragOver(SidebarItem sideBarItem, SidebarItemDropPosition dropPosition, DragEventArgs rawEvent)
internal void RaiseItemDragOver(SidebarItem sideBarItem, SidebarItemDropPosition dropPosition, DragEventArgs rawEvent)
{
if (sideBarItem.Item is null) return;
await ViewModel.HandleItemDragOverAsync(new ItemDragOverEventArgs(sideBarItem.Item, rawEvent.DataView, dropPosition, rawEvent));
ItemDragOver?.Invoke(this, new(sideBarItem.Item, rawEvent.DataView, dropPosition, rawEvent));
}

private void UpdateMinimalMode()
Expand Down Expand Up @@ -230,8 +230,7 @@ private void SidebarResizer_ManipulationCompleted(object sender, ManipulationCom

private void MenuItemHostScrollViewer_ContextRequested(UIElement sender, ContextRequestedEventArgs e)
{
var newArgs = new ItemContextInvokedArgs(null, e.TryGetPosition(this, out var point) ? point : default);
ViewModel.HandleItemContextInvokedAsync(this, newArgs);
ItemContextInvoked?.Invoke(this, new(null, e.TryGetPosition(this, out var point) ? point : default));
e.Handled = true;
}

Expand Down
14 changes: 7 additions & 7 deletions src/Files.App.Controls/Sidebar/SidebarViewAutomationPeer.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -6,6 +6,9 @@

namespace Files.App.Controls
{
/// <summary>
/// Exposes <see cref="SidebarView"/> types to Microsoft UI Automation.
/// </summary>
public sealed partial class SidebarViewAutomationPeer : FrameworkElementAutomationPeer, ISelectionProvider
{
public bool CanSelectMultiple => false;
Expand All @@ -20,20 +23,17 @@ public SidebarViewAutomationPeer(SidebarView owner) : base(owner)

protected override object GetPatternCore(PatternInterface patternInterface)
{
if (patternInterface == PatternInterface.Selection)
{
if (patternInterface is PatternInterface.Selection)
return this;
}

return base.GetPatternCore(patternInterface);
}

public IRawElementProviderSimple[] GetSelection()
{
if (Owner.SelectedItemContainer != null)
return
[
ProviderFromPeer(CreatePeerForElement(Owner.SelectedItemContainer))
];
return [ProviderFromPeer(CreatePeerForElement(Owner.SelectedItemContainer))];

return [];
}
}
Expand Down
2 changes: 1 addition & 1 deletion src/Files.App/ViewModels/UserControls/SidebarViewModel.cs
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Expand Up @@ -19,7 +19,7 @@

namespace Files.App.ViewModels.UserControls
{
public sealed partial class SidebarViewModel : ObservableObject, IDisposable, ISidebarViewModel
public sealed partial class SidebarViewModel : ObservableObject, IDisposable
{
private INetworkService NetworkService { get; } = Ioc.Default.GetRequiredService<INetworkService>();
private IUserSettingsService UserSettingsService { get; } = Ioc.Default.GetRequiredService<IUserSettingsService>();
Expand Down
7 changes: 5 additions & 2 deletions src/Files.App/Views/MainPage.xaml
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Expand Up @@ -180,11 +180,14 @@
HorizontalContentAlignment="Stretch"
DisplayMode="{x:Bind SidebarAdaptiveViewModel.SidebarDisplayMode, Mode=TwoWay}"
IsPaneOpen="{x:Bind ViewModel.IsSidebarPaneOpen, Mode=TwoWay}"
ItemContextInvoked="SidebarControl_ItemContextInvoked"
ItemDragOver="SidebarControl_ItemDragOver"
ItemDropped="SidebarControl_ItemDropped"
ItemInvoked="SidebarControl_ItemInvoked"
Loaded="SidebarControl_Loaded"
MenuItemsSource="{x:Bind SidebarAdaptiveViewModel.SidebarItems, Mode=OneWay}"
OpenPaneLength="{x:Bind UserSettingsService.AppearanceSettingsService.SidebarWidth, Mode=TwoWay}"
SelectedItem="{x:Bind SidebarAdaptiveViewModel.SidebarSelectedItem, Mode=TwoWay}"
ViewModel="{x:Bind SidebarAdaptiveViewModel}">
SelectedItem="{x:Bind SidebarAdaptiveViewModel.SidebarSelectedItem, Mode=TwoWay}">

<!-- Inner Content -->
<controls:SidebarView.InnerContent>
Expand Down
23 changes: 23 additions & 0 deletions src/Files.App/Views/MainPage.xaml.cs
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Expand Up @@ -13,6 +13,7 @@
using Microsoft.UI.Xaml.Navigation;
using Windows.Foundation.Metadata;
using Windows.Graphics;
using Windows.UI.Input;
using WinUIEx;
using GridSplitter = Files.App.Controls.GridSplitter;
using VirtualKey = Windows.System.VirtualKey;
Expand Down Expand Up @@ -465,5 +466,27 @@ private void Page_PointerReleased(object sender, PointerRoutedEventArgs e)
// shortcuts from working properly, see https://github.com/microsoft/microsoft-ui-xaml/issues/6467
DispatcherQueue.TryEnqueue(() => ContentPageContext.ShellPage?.PaneHolder.FocusActivePane());
}

private void SidebarControl_ItemContextInvoked(object sender, ItemContextInvokedArgs e)
{
SidebarAdaptiveViewModel.HandleItemContextInvokedAsync(sender, e);
}

private async void SidebarControl_ItemDragOver(object sender, ItemDragOverEventArgs e)
{
var deferral = e.RawEvent.GetDeferral();
await SidebarAdaptiveViewModel.HandleItemDragOverAsync(e);
deferral.Complete();
}

private async void SidebarControl_ItemDropped(object sender, ItemDroppedEventArgs e)
{
await SidebarAdaptiveViewModel.HandleItemDroppedAsync(e);
}
Comment on lines +482 to +485
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@sentry sentry bot Dec 19, 2025

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Bug: The async event handler SidebarControl_ItemDropped is missing a required deferral, which can cause the drag operation's data to become invalid before async work finishes.
Severity: HIGH | Confidence: High

🔍 Detailed Analysis

The SidebarControl_ItemDropped event handler is an async method that performs significant asynchronous work, such as file operations and database updates, via SidebarAdaptiveViewModel.HandleItemDroppedAsync. However, it fails to acquire a deferral from the ItemDroppedEventArgs. In the WinUI drag-and-drop API, a deferral is necessary to prevent the operating system from cleaning up the drag operation's data context before the asynchronous work completes. Without it, the DataPackageView could be invalidated mid-operation, leading to failed drop actions.

💡 Suggested Fix

In the SidebarControl_ItemDropped method, acquire a deferral from the event arguments before the await call and complete it after the operation is finished. Example: var deferral = e.RawEvent.GetDeferral(); await SidebarAdaptiveViewModel.HandleItemDroppedAsync(e); deferral.Complete();

🤖 Prompt for AI Agent 
Review the code at the location below. A potential bug has been identified by an AI
agent.
Verify if this is a real issue. If it is, propose a fix; if not, explain why it's not
valid.

Location: src/Files.App/Views/MainPage.xaml.cs#L482-L485

Potential issue: The `SidebarControl_ItemDropped` event handler is an `async` method
that performs significant asynchronous work, such as file operations and database
updates, via `SidebarAdaptiveViewModel.HandleItemDroppedAsync`. However, it fails to
acquire a deferral from the `ItemDroppedEventArgs`. In the WinUI drag-and-drop API, a
deferral is necessary to prevent the operating system from cleaning up the drag
operation's data context before the asynchronous work completes. Without it, the
`DataPackageView` could be invalidated mid-operation, leading to failed drop actions.

Did we get this right? 👍 / 👎 to inform future reviews.
Reference ID: 7750491

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@0x5bfa 0x5bfa Dec 19, 2025

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I moved this code from here, where there is no deferral code.

image


private void SidebarControl_ItemInvoked(object sender, ItemInvokedEventArgs e)
{
SidebarAdaptiveViewModel.HandleItemInvokedAsync(((SidebarItem)sender).Item, e.PointerUpdateKind);
}
}
}
30 changes: 0 additions & 30 deletions tests/Files.App.UITests/TestData/TestSidebarViewModel.cs
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This file was deleted.

2 changes: 0 additions & 2 deletions tests/Files.App.UITests/Views/SidebarViewPage.xaml.cs
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Expand Up @@ -15,8 +15,6 @@ public SidebarViewPage()
sidebarModels.Add(new TestSidebarModel { Text = "Test 1" });
sidebarModels.Add(new TestSidebarModel { Text = "Test 2" });
sidebarModels.Add(new TestSidebarModel { Text = "Test 3" });

Sidebar.ViewModel = new TestSidebarViewModel();
}
}
}
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