Add ListView-like hotkeys support to TableView

src/TableView.Properties.cs

@@ -310,6 +310,11 @@ public bool CanPaste
     /// </summary>
     public static readonly DependencyProperty ShowDragRectangleProperty = DependencyProperty.Register(nameof(ShowDragRectangle), typeof(bool), typeof(TableView), new PropertyMetadata(true, OnShowDragRectangleChanged));
 
+    /// <summary>
+    /// Identifies the <see cref="UseListViewHotkeys"/> dependency property.
+    /// </summary>
+    public static readonly DependencyProperty UseListViewHotkeysProperty = DependencyProperty.Register(nameof(UseListViewHotkeys), 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.
     /// </summary>
@@ -869,6 +874,15 @@ public bool CanReorderColumns
         set => SetValue(CanReorderColumnsProperty, value);
     }
 
+    /// <summary>
+    /// Gets or sets whether the TableView should use ListView like hotkeys for navigation and selection.
+    /// </summary>
+    public bool UseListViewHotkeys
+    {
+        get => (bool)GetValue(UseListViewHotkeysProperty);
+        set => SetValue(UseListViewHotkeysProperty, value);
+    }
+
     /// <summary>
     /// Handles changes to the ItemsSource property.
     /// </summary>

src/TableView.cs

@@ -170,6 +170,16 @@ protected override DependencyObject GetContainerForItemOverride()
         return row;
     }
 
+    /// <summary>
+    /// Gets a value indicating whether keyboard input should be handled in row context,
+    /// i.e. when <see cref="UseListViewHotkeys"/> is enabled and the effective selection unit is a row.
+    /// </summary>
+    private bool IsRowKeyboardContext =>
+        UseListViewHotkeys &&
+        (SelectionUnit == TableViewSelectionUnit.Row ||
+         (SelectionUnit == TableViewSelectionUnit.CellOrRow &&
+          LastSelectionUnit == TableViewSelectionUnit.Row));
+
     /// <inheritdoc/>
     protected override void OnKeyDown(KeyRoutedEventArgs e)
     {
@@ -182,9 +192,92 @@ protected override void OnKeyDown(KeyRoutedEventArgs e)
             return;
         }
 
+        if (!IsEditing && IsRowKeyboardContext)
+        {
+            if (!shiftKey &&
+                !ctrlKey &&
+                SelectionMode == ListViewSelectionMode.Multiple &&
+                e.Key == VirtualKey.Enter)
+            {
+                ToggleCurrentRowSelection();
+                e.Handled = true;
+                return;
+            }
+
+            var rowSelectionOnly = SelectionUnit == TableViewSelectionUnit.Row;
+
+            if (e.Key is VirtualKey.Up or VirtualKey.Down or
+                    VirtualKey.Home or VirtualKey.End or
+                    VirtualKey.PageUp or VirtualKey.PageDown ||
+                (rowSelectionOnly && (e.Key is VirtualKey.Left or VirtualKey.Right)))
+            {
+                int? prevCellRow = null;
+                if (SelectionUnit == TableViewSelectionUnit.Row && CurrentCellSlot.HasValue)
+                {
+                    prevCellRow = CurrentCellSlot.Value.Row;
+                }
+
+                base.OnKeyDown(e); // Let ListView move the row focus / selection
+
+                var focusedIndex = GetFocusedRowIndex();
+                if (focusedIndex >= 0)
+                {
+                    CurrentRowIndex = focusedIndex;
+                    SelectionStartRowIndex ??= focusedIndex;
+                }
+
+                if (SelectionUnit == TableViewSelectionUnit.Row &&
+                    prevCellRow.HasValue &&
+                    focusedIndex >= 0 &&
+                    focusedIndex != prevCellRow.Value)
+                {
+                    CurrentCellSlot = null;  // will un-apply old cell's current-state border
+                }
+                return;
+            }
+        }
+
+        // Everything else (cell nav, F2 in cell mode, Space, etc.)
         HandleNavigations(e, shiftKey, ctrlKey);
     }
 
+    private void ToggleCurrentRowSelection()
+    {
+        var index = GetFocusedRowIndex();
+
+        if (index < 0)
+        {
+            var rowIndex = CurrentRowIndex ?? SelectedIndex;
+
+            if (rowIndex is < 0 || rowIndex >= Items.Count)
+            {
+                return;
+            }
+
+            index = rowIndex;
+        }
+
+
+        if (index < 0 || index >= Items.Count) { return; }
+
+        var isSelected = SelectedRanges.Any(r => r.IsInRange(index));
+
+        var singleIndexRange = new ItemIndexRange(index, 1u);
+
+        if (isSelected)
+        {
+            DeselectRange(singleIndexRange);
+        }
+        else
+        {
+            SelectRange(singleIndexRange);
+        }
+
+        SelectionStartRowIndex = index;
+        CurrentRowIndex = index;
+
+    }
+
     /// <summary>
     /// Handles navigation keys.
     /// </summary>
@@ -533,6 +626,34 @@ private TableViewCellSlot GetNextSlot(TableViewCellSlot? currentSlot, bool isShi
         return new TableViewCellSlot(nextRow, nextColumn);
     }
 
+    private int GetFocusedRowIndex()
+    {
+        if (XamlRoot is null)
+            return -1;
+
+        var focused = FocusManager.GetFocusedElement(XamlRoot) as DependencyObject;
+        if (focused is null)
+            return -1;
+
+        var row = GetRowFromElement(focused);
+        return row?.Index ?? -1;
+    }
+
+    private static TableViewRow? GetRowFromElement(DependencyObject element)
+    {
+        var current = element;
+
+        while (current is not null)
+        {
+            if (current is TableViewRow row)
+                return row;
+
+            current = VisualTreeHelper.GetParent(current);
+        }
+
+        return null;
+    }
+
     /// <summary>
     /// Copies the selected rows or cells content to the clipboard.
     /// </summary>