refactor TValue<T> to record and move to Helpers

Author: w-ahmad

src/Helpers/TValue.cs

@@ -0,0 +1,25 @@
+namespace WinUI.TableView.Helpers;
+
+/// <summary>
+/// Represents a value type wrapper that enables implicit conversion between the wrapped value and the wrapper type.
+/// </summary>
+/// <typeparam name="T">The value type to be wrapped. Must be a struct.</typeparam>
+/// <param name="Value">The value to wrap.</param>
+internal record TValue<T>(T Value) where T : struct
+{
+    /// <summary>
+    /// Defines an implicit conversion from a TValue<T> instance to its underlying value of type T.
+    /// </summary>
+    public static implicit operator T(TValue<T> value)
+    {
+        return value.Value;
+    }
+
+    /// <summary>
+    /// Defines an implicit conversion from the underlying value type to a TValue<T> instance.
+    /// </summary>
+    public static implicit operator TValue<T>(T value)
+    {
+        return new(value);
+    }
+}

src/TableView.Properties.cs

@@ -8,6 +8,7 @@
 using System.Linq;
 using System.Runtime.CompilerServices;
 using System.Threading.Tasks;
+using WinUI.TableView.Helpers;
 
 namespace WinUI.TableView;
 
@@ -263,7 +264,7 @@ public partial class TableView
     /// <summary>
     /// Identifies the <see cref="ShowFilterItemsCount"/> dependency property.
     /// </summary>
-    public static readonly DependencyProperty ShowFilterItemsCountProperty =  DependencyProperty.Register(nameof(ShowFilterItemsCount), typeof(bool), typeof(TableView), new PropertyMetadata(false));
+    public static readonly DependencyProperty ShowFilterItemsCountProperty = DependencyProperty.Register(nameof(ShowFilterItemsCount), typeof(bool), typeof(TableView), new PropertyMetadata(false));
 
     /// <summary>
     /// Gets or sets a value indicating whether opening the column filter over header right-click is enabled.
@@ -360,6 +361,9 @@ public bool ShowFilterItemsCount
     /// </summary>
     internal bool IsEditing { get; private set; }
 
+    /// <summary>
+    /// Gets the visibility states of details pane for each item.
+    /// </summary>
     internal ConditionalWeakTable<object, TValue<bool>> DetailsPaneStates { get; } = [];
 
     /// <summary>

src/TableViewRowPresenter.cs

@@ -14,26 +14,6 @@
 
 namespace WinUI.TableView;
 
-internal class TValue<T> where T : struct
-{
-    public TValue(T value)
-    {
-        Value = value;
-    }
-
-    public T Value { get; }
-
-    public static implicit operator T(TValue<T> value)
-    {
-        return value.Value;
-    }
-
-    public static implicit operator TValue<T>(T value)
-    {
-        return new(value);
-    }
-}
-
 /// <summary>
 /// Represents a control that presents visuals for the <see cref="WinUI.TableView.TableViewRow"/>.
 /// </summary>