Add ColumnAutoWidthMode

src/ColumnAutoWidthMode.cs

@@ -0,0 +1,22 @@
+namespace WinUI.TableView;
+
+/// <summary>
+/// Specifies the behavior for automatic column width.
+/// </summary>
+public enum ColumnAutoWidthMode
+{
+    /// <summary>
+    /// Column width is adjusted to both header and maximum cell width.
+    /// </summary>
+    Both,
+
+    /// <summary>
+    /// Column width is adjusted to maximum cell width.
+    /// </summary>
+    Cells,
+
+    /// <summary>
+    /// Column width is adjusted to header width.
+    /// </summary>
+    Header
+}

src/Columns/TableViewColumn.cs

@@ -183,6 +183,15 @@ public double ActualWidth
         set => SetValue(ActualWidthProperty, value);
     }
 
+    /// <summary>
+    /// Gets or sets the ColumnAutoWidthMode of the column.
+    /// </summary>
+    public ColumnAutoWidthMode? ColumnAutoWidthMode
+    {
+        get => (ColumnAutoWidthMode?)GetValue(ColumnAutoWidthModeProperty);
+        set => SetValue(ColumnAutoWidthModeProperty, value);
+    }
+
     /// <summary>
     /// Gets or sets a value indicating whether the column can be resized.
     /// </summary>
@@ -504,6 +513,11 @@ public string? SortMemberPath
     /// </summary>
     public static readonly DependencyProperty ActualWidthProperty = DependencyProperty.Register(nameof(ActualWidth), typeof(double), typeof(TableViewColumn), new PropertyMetadata(0d, OnPropertyChanged));
 
+    /// <summary>
+    /// Identifies the ActualWidth dependency property.
+    /// </summary>
+    public static readonly DependencyProperty ColumnAutoWidthModeProperty = DependencyProperty.Register(nameof(ColumnAutoWidthMode), typeof(ColumnAutoWidthMode?), typeof(TableViewColumn), new PropertyMetadata(null));
+
     /// <summary>
     /// Identifies the CanResize dependency property.
     /// </summary>

src/TableView.Properties.cs

@@ -221,6 +221,11 @@ public partial class TableView
     /// </summary>
     public static readonly DependencyProperty RowHeaderTemplateSelectorProperty = DependencyProperty.Register(nameof(RowHeaderTemplateSelector), typeof(DataTemplateSelector), typeof(TableView), new PropertyMetadata(null, OnRowHeaderTemplateChanged));
 
+    /// <summary>
+    /// Identifies the ColumnAutoWidthMode dependency property.
+    /// </summary>
+    public static readonly DependencyProperty ColumnAutoWidthModeProperty = DependencyProperty.Register(nameof(ColumnAutoWidthMode), typeof(ColumnAutoWidthMode), typeof(TableView), new PropertyMetadata(ColumnAutoWidthMode.Both));
+
     /// <summary>
     /// Identifies the FrozenColumnCount dependency property.
     /// </summary>
@@ -725,6 +730,15 @@ public DataTemplateSelector RowHeaderTemplateSelector
         set => SetValue(RowHeaderTemplateSelectorProperty, value);
     }
 
+    /// <summary>
+    /// Gets or sets the ColumnAutoWidthMode for all columns.
+    /// </summary>
+    public ColumnAutoWidthMode ColumnAutoWidthMode
+    {
+        get => (ColumnAutoWidthMode)GetValue(ColumnAutoWidthModeProperty);
+        set => SetValue(ColumnAutoWidthModeProperty, value);
+    }
+
     /// <summary>
     /// Gets or sets the number of columns that stays in view on horizontal scroll.
     /// </summary>

src/TableViewCell.cs

@@ -111,7 +111,7 @@ void OnContentLoaded(object sender, RoutedEventArgs e)
     /// <inheritdoc/>
     protected override Size MeasureOverride(Size availableSize)
     {
-        if (Column is not null && Row is not null && _contentPresenter is not null && Content is FrameworkElement element)
+        if (TableView is not null && Column is not null && Row is not null && _contentPresenter is not null && Content is FrameworkElement element)
         {
             if (Column is TableViewTemplateColumn)
             {
@@ -132,16 +132,20 @@ protected override Size MeasureOverride(Size availableSize)
 
             element.Measure(new Size(double.PositiveInfinity, double.PositiveInfinity));
 
-            var desiredWidth = element.DesiredSize.Width;
-            desiredWidth += Padding.Left;
-            desiredWidth += Padding.Right;
-            desiredWidth += BorderThickness.Left;
-            desiredWidth += BorderThickness.Right;
-            desiredWidth += _selectionBorder?.BorderThickness.Right ?? 0;
-            desiredWidth += _selectionBorder?.BorderThickness.Left ?? 0;
-            desiredWidth += _v_gridLine?.ActualWidth ?? 0d;
-
-            Column.DesiredWidth = Math.Max(Column.DesiredWidth, desiredWidth);
+            var autoSizeMode = Column.ColumnAutoWidthMode ?? TableView.ColumnAutoWidthMode;
+            if (autoSizeMode is ColumnAutoWidthMode.Cells or ColumnAutoWidthMode.Both)
+            {
+                var desiredWidth = element.DesiredSize.Width;
+                desiredWidth += Padding.Left;
+                desiredWidth += Padding.Right;
+                desiredWidth += BorderThickness.Left;
+                desiredWidth += BorderThickness.Right;
+                desiredWidth += _selectionBorder?.BorderThickness.Right ?? 0;
+                desiredWidth += _selectionBorder?.BorderThickness.Left ?? 0;
+                desiredWidth += _v_gridLine?.ActualWidth ?? 0d;
+
+                Column.DesiredWidth = Math.Max(Column.DesiredWidth, desiredWidth);
+            }
 
             #region TEMP_FIX_FOR_ISSUE https://github.com/microsoft/microsoft-ui-xaml/issues/9860
             var contentWidth = Column.ActualWidth;

src/TableViewColumnHeader.cs

@@ -10,6 +10,7 @@
 using System.Collections.Generic;
 using System.Linq;
 using System.Threading.Tasks;
+using Windows.Foundation;
 using Windows.System;
 using Windows.UI.Core;
 using WinUI.TableView.Collections;
@@ -597,6 +598,23 @@ protected override void OnPointerReleased(PointerRoutedEventArgs e)
         _reorderStarted = false;
     }
 
+    /// <inheritdoc/>
+    protected override Size MeasureOverride(Size availableSize)
+    {
+        var desiredHeaderSize = base.MeasureOverride(availableSize);
+
+        if (Column is not null && _tableView is not null)
+        {
+            var autoWidthMode = Column.ColumnAutoWidthMode ?? _tableView.ColumnAutoWidthMode;
+            if (autoWidthMode is ColumnAutoWidthMode.Header or ColumnAutoWidthMode.Both)
+            {
+                Column.DesiredWidth = Math.Max(Column.DesiredWidth, desiredHeaderSize.Width);
+            }
+        }
+
+        return desiredHeaderSize;
+    }
+
     /// <summary>
     /// Ensures grid lines are applied.
     /// </summary>

src/TableViewHeaderRow.cs

@@ -289,7 +289,8 @@ internal void CalculateHeaderWidths()
             var starUnitWeight = starColumns.Select(x => x.Width.Value).Sum();
             var fixedWidth = autoColumns.Select(x =>
             {
-                if (x.HeaderControl is { } header)
+                var autoWidthMode = x.ColumnAutoWidthMode ?? TableView.ColumnAutoWidthMode;
+                if (x.HeaderControl is { } header && autoWidthMode is not ColumnAutoWidthMode.Cells)
                 {
                     header.Measure(new Size(double.PositiveInfinity, height));
                     return Math.Max(x.DesiredWidth, header.DesiredSize.Width);