Error handling, better path remembrance

src/AppCommon/FileTime.App.Core/ViewModels/ItemViewModel.cs

@@ -4,6 +4,7 @@ using DynamicData;
 using FileTime.App.Core.Models;
 using FileTime.App.Core.Models.Enums;
 using FileTime.App.Core.Services;
+using FileTime.Core.Helper;
 using FileTime.Core.Models;
 using MoreLinq;
 using MvvmGen;
@@ -15,6 +16,8 @@ namespace FileTime.App.Core.ViewModels;
 [Inject(typeof(IItemNameConverterService), "_itemNameConverterService")]
 public abstract partial class ItemViewModel : IItemViewModel
 {
+    private ITabViewModel? _parentTab;
+
     [Property]
     private IItem? _baseItem;
 
@@ -44,6 +47,8 @@ public abstract partial class ItemViewModel : IItemViewModel
 
     public void Init(IItem item, ITabViewModel parentTab, ItemViewModelType itemViewModelType)
     {
+        _parentTab = parentTab;
+
         var sourceCollection = itemViewModelType switch
         {
             ItemViewModelType.Main => parentTab.CurrentItemsCollectionObservable,
@@ -51,21 +56,21 @@ public abstract partial class ItemViewModel : IItemViewModel
             ItemViewModelType.SelectedChild => parentTab.SelectedsChildrenCollectionObservable,
             _ => throw new InvalidEnumArgumentException()
         };
-        
+
         BaseItem = item;
         DisplayName = _appState.SearchText.Select(s => _itemNameConverterService.GetDisplayName(item.DisplayName, s));
         DisplayNameText = item.DisplayName;
-        
-        IsMarked = itemViewModelType is ItemViewModelType.Main 
+
+        IsMarked = itemViewModelType is ItemViewModelType.Main
             ? parentTab.MarkedItems.ToCollection().Select(m => m.Any(i => i.Path == item.FullName?.Path))
             : Observable.Return(false);
-        
+
         IsSelected = itemViewModelType is ItemViewModelType.Main
             ? parentTab.CurrentSelectedItem.Select(EqualsTo)
-            : Observable.Return(false);
-        
+            : Observable.Return(IsInDeespestPath());
+
         IsAlternative = sourceCollection.Select(c => c?.Index().FirstOrDefault(i => EqualsTo(i.Value)).Key % 2 == 0);
-        
+
         ViewMode = Observable.CombineLatest(IsMarked, IsSelected, IsAlternative, GenerateViewMode).Throttle(TimeSpan.FromMilliseconds(10));
         Attributes = item.Attributes;
         CreatedAt = item.CreatedAt;
@@ -86,4 +91,19 @@ public abstract partial class ItemViewModel : IItemViewModel
     {
         return BaseItem?.FullName?.Path is string path && path == itemViewModel?.BaseItem?.FullName?.Path;
     }
+
+    private bool IsInDeespestPath()
+    {
+        if (_parentTab?.Tab?.LastDeepestSelectedPath is null
+            || BaseItem?.FullName is null)
+        {
+            return false;
+        }
+
+        var ownFullName = BaseItem.FullName;
+        var deepestPath = _parentTab.Tab.LastDeepestSelectedPath;
+        var commonPath = new FullName(PathHelper.GetCommonPath(ownFullName.Path, deepestPath.Path));
+
+        return commonPath.Path == ownFullName.Path;
+    }
 }