Add folder deletion context menu

StabilityMatrix.Avalonia/DesignData/DesignData.cs

@@ -129,7 +129,7 @@ public static class DesignData
             {
                 Title = "Lora",
                 DirectoryPath = "Packages/lora",
-                CheckpointFiles = new ObservableCollection<CheckpointFile>
+                CheckpointFiles = new AdvancedObservableList<CheckpointFile>
                 {
                     new()
                     {
@@ -162,7 +162,7 @@ public static class DesignData
             {
                 Title = "VAE",
                 DirectoryPath = "Packages/VAE",
-                CheckpointFiles = new ObservableCollection<CheckpointFile>
+                CheckpointFiles = new AdvancedObservableList<CheckpointFile>
                 {
                     new()
                     {

StabilityMatrix.Avalonia/DialogHelper.cs

@@ -4,8 +4,10 @@ using System.ComponentModel;
 using System.Diagnostics;
 using System.Linq;
 using System.Runtime.CompilerServices;
+using Avalonia;
 using Avalonia.Controls;
 using Avalonia.Data;
+using Avalonia.Media;
 using Avalonia.Threading;
 using CommunityToolkit.Mvvm.Input;
 using FluentAvalonia.UI.Controls;
@@ -132,6 +134,41 @@ public static class DialogHelper
             IsPrimaryButtonEnabled = false,
         };
     }
+    
+    /// <summary>
+    /// Create a simple title and description task dialog.
+    /// Sets the XamlRoot to the current top level window.
+    /// </summary>
+    public static TaskDialog CreateTaskDialog(string title, string description)
+    {
+        Dispatcher.UIThread.VerifyAccess();
+        
+        var content = new StackPanel
+        {
+            Children =
+            {
+                new TextBlock
+                {
+                    Margin = new Thickness(0,0,0,8),
+                    FontSize = 16,
+                    Text = title,
+                    TextWrapping = TextWrapping.WrapWithOverflow,
+                },
+                new TextBlock
+                {
+                    Text = description,
+                    TextWrapping = TextWrapping.WrapWithOverflow,
+                }
+            }
+        };
+
+        return new TaskDialog
+        {
+            Title = title,
+            Content = content,
+            XamlRoot = App.VisualRoot
+        };
+    }
 }
 
 // Text fields

StabilityMatrix.Avalonia/Models/AdvancedObservableList.cs

@@ -0,0 +1,71 @@
+using System;
+using System.Collections.Generic;
+using System.Collections.Specialized;
+using Avalonia.Collections;
+using Avalonia.Threading;
+
+namespace StabilityMatrix.Avalonia.Models;
+
+/// <summary>
+/// Observable AvaloniaList supporting child item deletion requests.
+/// </summary>
+public class AdvancedObservableList<T> : AvaloniaList<T>
+{
+    /// <inheritdoc />
+    public AdvancedObservableList()
+    {
+        CollectionChanged += CollectionChangedEventRegistrationHandler;
+    }
+    
+    /// <inheritdoc />
+    public AdvancedObservableList(IEnumerable<T> items) : base(items)
+    {
+        CollectionChanged += CollectionChangedEventRegistrationHandler;
+    }
+    
+    private void CollectionChangedEventRegistrationHandler(object? sender, NotifyCollectionChangedEventArgs e)
+    {
+        if (e.OldItems != null)
+        {
+            foreach (var item in e.OldItems)
+            {
+                TryUnregisterRemovableListItem((T)item);
+            }
+        }
+        if (e.NewItems != null)
+        {
+            foreach (var item in e.NewItems)
+            {
+                TryRegisterRemovableListItem((T)item);
+            }
+        }
+    }
+    
+    private void OnItemRemoveRequested(object? sender, EventArgs e)
+    {
+        if (sender is T item)
+        {
+            Dispatcher.UIThread.Post(() => Remove(item));
+        }
+    }
+    
+    private bool TryRegisterRemovableListItem(T item)
+    {
+        if (item is IRemovableListItem removableListItem)
+        {
+            removableListItem.ParentListRemoveRequested += OnItemRemoveRequested;
+            return true;
+        }
+        return false;
+    }
+    
+    private bool TryUnregisterRemovableListItem(T item)
+    {
+        if (item is IRemovableListItem removableListItem)
+        {
+            removableListItem.ParentListRemoveRequested -= OnItemRemoveRequested;
+            return true;
+        }
+        return false;
+    }
+}

StabilityMatrix.Avalonia/Models/IRemovableListItem.cs

@@ -0,0 +1,8 @@
+using System;
+
+namespace StabilityMatrix.Avalonia.Models;
+
+public interface IRemovableListItem
+{
+    public event EventHandler ParentListRemoveRequested;
+}

StabilityMatrix.Avalonia/ViewModels/CheckpointFile.cs

@@ -5,10 +5,7 @@ using System.Diagnostics;
 using System.IO;
 using System.Linq;
 using System.Threading.Tasks;
-using AsyncAwaitBestPractices;
 using Avalonia.Data;
-using Avalonia.Media.Imaging;
-using Avalonia.Threading;
 using CommunityToolkit.Mvvm.ComponentModel;
 using CommunityToolkit.Mvvm.Input;
 using FluentAvalonia.UI.Controls;
@@ -25,9 +22,6 @@ public partial class CheckpointFile : ViewModelBase
 {
     private static readonly Logger Logger = LogManager.GetCurrentClassLogger();
 
-    // Event for when this file is deleted
-    public event EventHandler<CheckpointFile>? Deleted;
-
     /// <summary>
     /// Absolute path to the checkpoint file.
     /// </summary>
@@ -122,7 +116,7 @@ public partial class CheckpointFile : ViewModelBase
                 IsLoading = false;
             }
         }
-        Deleted?.Invoke(this, this);
+        RemoveFromParentList();
     }
 
     [RelayCommand]

StabilityMatrix.Avalonia/ViewModels/CheckpointFolder.cs

@@ -1,6 +1,5 @@
 using System;
 using System.Collections.Generic;
-using System.Collections.ObjectModel;
 using System.Collections.Specialized;
 using System.IO;
 using System.Linq;
@@ -9,10 +8,10 @@ using Avalonia.Controls;
 using Avalonia.Input;
 using Avalonia.Platform.Storage;
 using Avalonia.Threading;
-using AvaloniaEdit.Utils;
 using CommunityToolkit.Mvvm.ComponentModel;
 using CommunityToolkit.Mvvm.Input;
 using FluentAvalonia.UI.Controls;
+using StabilityMatrix.Avalonia.Models;
 using StabilityMatrix.Core.Extensions;
 using StabilityMatrix.Core.Helper;
 using StabilityMatrix.Core.Models;
@@ -77,9 +76,9 @@ public partial class CheckpointFolder : ViewModelBase
     public ProgressViewModel Progress { get; } = new();
 
     public CheckpointFolder? ParentFolder { get; init; }
-    public ObservableCollection<CheckpointFolder> SubFolders { get; init; } = new();
+    public AdvancedObservableList<CheckpointFolder> SubFolders { get; init; } = new();
-    public ObservableCollection<CheckpointFile> CheckpointFiles { get; init; } = new();
+    public AdvancedObservableList<CheckpointFile> CheckpointFiles { get; init; } = new();
-    public ObservableCollection<CheckpointFile> DisplayedCheckpointFiles { get; set; }
+    public AdvancedObservableList<CheckpointFile> DisplayedCheckpointFiles { get; set; }
 
     public CheckpointFolder(
         ISettingsManager settingsManager,
@@ -121,7 +120,7 @@ public partial class CheckpointFolder : ViewModelBase
         {
             var filteredFiles = CheckpointFiles.Where(y =>
                 y.FileName.Contains(value, StringComparison.OrdinalIgnoreCase));
-            DisplayedCheckpointFiles = new ObservableCollection<CheckpointFile>(filteredFiles);
+            DisplayedCheckpointFiles = new AdvancedObservableList<CheckpointFile>(filteredFiles);
         }
     }
 
@@ -137,30 +136,9 @@ public partial class CheckpointFolder : ViewModelBase
         }
     }
     
-    // On collection changes
     private void OnCheckpointFilesChanged(object? sender, NotifyCollectionChangedEventArgs e)
     {
         OnPropertyChanged(nameof(TitleWithFilesCount));
-        if (e.NewItems == null) return;
-        // On new added items, add event handler for deletion
-        foreach (CheckpointFile item in e.NewItems)
-        {
-            item.Deleted += OnCheckpointFileDelete;
-        }
-    }
-
-    /// <summary>
-    /// Handler for CheckpointFile requesting to be deleted from the collection.
-    /// </summary>
-    /// <param name="sender"></param>
-    /// <param name="file"></param>
-    private void OnCheckpointFileDelete(object? sender, CheckpointFile file)
-    {
-        Dispatcher.UIThread.Post(() =>
-        {
-            CheckpointFiles.Remove(file);
-            DisplayedCheckpointFiles.Remove(file);
-        });
     }
 
     public async Task OnDrop(DragEventArgs e)
@@ -190,6 +168,52 @@ public partial class CheckpointFolder : ViewModelBase
         await ProcessRunner.OpenFolderBrowser(path);
     }
     
+    [RelayCommand]
+    private async Task Delete()
+    {
+        var directory = new DirectoryPath(DirectoryPath);
+
+        if (!directory.Exists)
+        {
+            RemoveFromParentList();
+            return;
+        }
+
+        var dialog = DialogHelper.CreateTaskDialog(
+            "Are you sure you want to delete this folder?",directory);
+
+        dialog.ShowProgressBar = false;
+        dialog.Buttons = new List<TaskDialogButton>
+        {
+            TaskDialogButton.YesButton,
+            TaskDialogButton.NoButton
+        };
+        
+        dialog.Closing += async (sender, e) =>
+        {
+            // We only want to use the deferral on the 'Yes' Button
+            if ((TaskDialogStandardResult)e.Result == TaskDialogStandardResult.Yes)
+            {
+                var deferral = e.GetDeferral();
+
+                sender.ShowProgressBar = true;
+                sender.SetProgressBarState(0, TaskDialogProgressState.Indeterminate);
+
+                await using (new MinimumDelay(200, 300))
+                {
+                    await directory.DeleteAsync(true);
+                }
+                
+                RemoveFromParentList();
+                deferral.Complete();
+            }
+        };
+
+        dialog.XamlRoot = App.VisualRoot;
+
+        await dialog.ShowAsync(true);
+    }
+    
     [RelayCommand]
     private async Task CreateSubFolder()
     {

StabilityMatrix.Avalonia/ViewModels/CheckpointsPageViewModel.cs

@@ -36,7 +36,9 @@ public partial class CheckpointsPageViewModel : PageViewModelBase
     [ObservableProperty] private bool isImportAsConnected;
     [ObservableProperty] private bool isLoading;
     [ObservableProperty] private bool isIndexing;
-    [ObservableProperty] private string searchFilter;
+    
+    [ObservableProperty]
+    private string searchFilter = string.Empty;
 
     partial void OnIsImportAsConnectedChanged(bool value)
     {
@@ -47,7 +49,8 @@ public partial class CheckpointsPageViewModel : PageViewModelBase
         }
     }
 
-    [ObservableProperty] private ObservableCollection<CheckpointFolder> checkpointFolders = new();
+    [ObservableProperty]
+    private ObservableCollection<CheckpointFolder> checkpointFolders = new();
 
     [ObservableProperty]
     private ObservableCollection<CheckpointFolder> displayedCheckpointFolders = new();
@@ -70,7 +73,8 @@ public partial class CheckpointsPageViewModel : PageViewModelBase
 
         // Set UI states
         IsImportAsConnected = settingsManager.Settings.IsImportAsConnected;
-        SearchFilter = string.Empty;
+        // Refresh search filter
+        OnSearchFilterChanged(string.Empty);
         
         if (Design.IsDesignMode) return;
         
@@ -81,6 +85,7 @@ public partial class CheckpointsPageViewModel : PageViewModelBase
         IsIndexing = false;
     }
 
+    // ReSharper disable once UnusedParameterInPartialMethod
     partial void OnSearchFilterChanged(string value)
     {
         var filteredFolders = CheckpointFolders

StabilityMatrix.Avalonia/ViewModels/ViewModelBase.cs

@@ -1,10 +1,28 @@
-using System.Threading.Tasks;
+using System;
+using System.Threading.Tasks;
+using AsyncAwaitBestPractices;
 using CommunityToolkit.Mvvm.ComponentModel;
+using StabilityMatrix.Avalonia.Models;
 
 namespace StabilityMatrix.Avalonia.ViewModels;
 
-public class ViewModelBase : ObservableValidator
+public class ViewModelBase : ObservableValidator, IRemovableListItem
 {
+    private WeakEventManager? parentListRemoveRequestedEventManager;
+    
+    public event EventHandler ParentListRemoveRequested
+    {
+        add
+        {
+            parentListRemoveRequestedEventManager ??= new WeakEventManager();
+            parentListRemoveRequestedEventManager.AddEventHandler(value);
+        }
+        remove => parentListRemoveRequestedEventManager?.RemoveEventHandler(value);
+    }
+
+    protected void RemoveFromParentList() => parentListRemoveRequestedEventManager?.RaiseEvent(
+        this, EventArgs.Empty, nameof(ParentListRemoveRequested));
+    
     public virtual void OnLoaded()
     {
         

StabilityMatrix.Avalonia/Views/CheckpointsPage.axaml

@@ -216,6 +216,11 @@
                         <ui:MenuFlyoutItem Text="Show in Explorer" IconSource="Open"
                                            Command="{Binding ShowInExplorerCommand}"
                                            CommandParameter="{Binding DirectoryPath}"/>
+                        <!-- Only allow deletion of non-root folders (Parent is not null) -->
+                        <ui:MenuFlyoutItem Text="Delete" IconSource="Delete"
+                                           IsEnabled="{Binding ParentFolder, Converter={x:Static ObjectConverters.IsNotNull}}"
+                                           IsVisible="{Binding ParentFolder, Converter={x:Static ObjectConverters.IsNotNull}}"
+                                           Command="{Binding DeleteCommand}"/>
                         <ui:MenuFlyoutSeparator/>
                         <ui:MenuFlyoutSubItem Text="New" IconSource="Add">
                             <ui:MenuFlyoutSubItem.Items>