gui-cs.Terminal.Gui/UnitTests/Views/TableViewTests.cs

using System.Collections;
using System.Data;
using System.Globalization;
using System.Reflection;
using Xunit.Abstractions;

namespace Terminal.Gui.ViewsTests;

public class TableViewTests (ITestOutputHelper output)
{
    /// <summary>Builds a simple list with the requested number of string items</summary>
    /// <param name="items"></param>
    /// <returns></returns>
    public static IList BuildList (int items)
    {
        List<string> list = new ();

        for (var i = 0; i < items; i++)
        {
            list.Add ("Item " + i);
        }

        return list.ToArray ();
    }

    public static DataTableSource BuildTable (int cols, int rows) { return BuildTable (cols, rows, out _); }

    /// <summary>Builds a simple table of string columns with the requested number of columns and rows</summary>
    /// <param name="cols"></param>
    /// <param name="rows"></param>
    /// <returns></returns>
    public static DataTableSource BuildTable (int cols, int rows, out DataTable dt)
    {
        dt = new ();

        for (var c = 0; c < cols; c++)
        {
            dt.Columns.Add ("Col" + c);
        }

        for (var r = 0; r < rows; r++)
        {
            DataRow newRow = dt.NewRow ();

            for (var c = 0; c < cols; c++)
            {
                newRow [c] = $"R{r}C{c}";
            }

            dt.Rows.Add (newRow);
        }

        return new (dt);
    }

    [Fact]
    [AutoInitShutdown]
    public void CellEventsBackgroundFill ()
    {
        var tv = new TableView { Width = 20, Height = 4 };

        var dt = new DataTable ();
        dt.Columns.Add ("C1");
        dt.Columns.Add ("C2");
        dt.Columns.Add ("C3");

        dt.Rows.Add ("Hello", DBNull.Value, "f");

        tv.Table = new DataTableSource (dt);
        tv.NullSymbol = string.Empty;

        var top = new Toplevel ();
        top.Add (tv);
        Application.Begin (top);

        tv.Draw ();

        var expected =
            @"
┌─────┬──┬─────────┐
│C1   │C2│C3       │
├─────┼──┼─────────┤
│Hello│  │f        │
";

        TestHelpers.AssertDriverContentsAre (expected, output);

        var color = new Attribute (Color.Magenta, Color.BrightBlue);

        var scheme = new ColorScheme
        {
            Normal = color,
            HotFocus = color,
            Focus = color,
            Disabled = color,
            HotNormal = color
        };

        // Now the thing we really want to test is the styles!
        // All cells in the column have a column style that says
        // the cell is pink!
        for (var i = 0; i < dt.Columns.Count; i++)
        {
            ColumnStyle style = tv.Style.GetOrCreateColumnStyle (i);
            style.ColorGetter = e => { return scheme; };
        }

        tv.Draw ();

        expected =
            @"
00000000000000000000
00000000000000000000
00000000000000000000
01111101101111111110
";
        TestHelpers.AssertDriverAttributesAre (expected, Application.Driver, tv.ColorScheme.Normal, color);
        top.Dispose ();
    }

    [Fact]
    public void DeleteRow_SelectAll_AdjustsSelectionToPreventOverrun ()
    {
        // create a 4 by 4 table
        var tableView = new TableView
        {
            Table = BuildTable (4, 4, out DataTable dt), MultiSelect = true, Viewport = new (0, 0, 10, 5)
        };
        tableView.BeginInit ();
        tableView.EndInit ();

        tableView.SelectAll ();
        Assert.Equal (16, tableView.GetAllSelectedCells ().Count ());

        // delete one of the columns
        dt.Columns.RemoveAt (2);

        // table should now be 3x4
        Assert.Equal (12, tableView.GetAllSelectedCells ().Count ());

        // remove a row
        dt.Rows.RemoveAt (1);

        // table should now be 3x3
        Assert.Equal (9, tableView.GetAllSelectedCells ().Count ());
    }

    [Fact]
    public void DeleteRow_SelectLastRow_AdjustsSelectionToPreventOverrun ()
    {
        // create a 4 by 4 table
        var tableView = new TableView
        {
            Table = BuildTable (4, 4, out DataTable dt), MultiSelect = true, Viewport = new (0, 0, 10, 5)
        };
        tableView.BeginInit ();
        tableView.EndInit ();

        tableView.ChangeSelectionToEndOfTable (false);

        // select the last row
        tableView.MultiSelectedRegions.Clear ();
        tableView.MultiSelectedRegions.Push (new (new (0, 3), new (0, 3, 4, 1)));

        Assert.Equal (4, tableView.GetAllSelectedCells ().Count ());

        // remove a row
        dt.Rows.RemoveAt (0);

        tableView.EnsureValidSelection ();

        // since the selection no longer exists it should be removed
        Assert.Empty (tableView.MultiSelectedRegions);
    }

    [Fact]
    public void EnsureValidScrollOffsets_LoadSmallerTable ()
    {
        var tableView = new TableView ();
        tableView.BeginInit ();
        tableView.EndInit ();
        tableView.Viewport = new (0, 0, 25, 10);

        Assert.Equal (0, tableView.RowOffset);
        Assert.Equal (0, tableView.ColumnOffset);

        // Set big table
        tableView.Table = BuildTable (25, 50);

        // Scroll down and along
        tableView.RowOffset = 20;
        tableView.ColumnOffset = 10;

        tableView.EnsureValidScrollOffsets ();

        // The scroll should be valid at the moment
        Assert.Equal (20, tableView.RowOffset);
        Assert.Equal (10, tableView.ColumnOffset);

        // Set small table
        tableView.Table = BuildTable (2, 2);

        // Setting a small table should automatically trigger fixing the scroll offsets to ensure valid cells
        Assert.Equal (0, tableView.RowOffset);
        Assert.Equal (0, tableView.ColumnOffset);

        // Trying to set invalid indexes should not be possible
        tableView.RowOffset = 20;
        tableView.ColumnOffset = 10;

        Assert.Equal (1, tableView.RowOffset);
        Assert.Equal (1, tableView.ColumnOffset);
    }

    [Fact]
    public void EnsureValidScrollOffsets_WithNoCells ()
    {
        var tableView = new TableView ();

        Assert.Equal (0, tableView.RowOffset);
        Assert.Equal (0, tableView.ColumnOffset);

        // Set empty table
        tableView.Table = new DataTableSource (new ());

        // Since table has no rows or columns scroll offset should default to 0
        tableView.EnsureValidScrollOffsets ();
        Assert.Equal (0, tableView.RowOffset);
        Assert.Equal (0, tableView.ColumnOffset);
    }

    [Theory]
    [InlineData (true)]
    [InlineData (false)]
    public void GetAllSelectedCells_SingleCellSelected_ReturnsOne (bool multiSelect)
    {
        var tableView = new TableView
        {
            Table = BuildTable (3, 3), MultiSelect = multiSelect, Viewport = new (0, 0, 10, 5)
        };
        tableView.BeginInit ();
        tableView.EndInit ();

        tableView.SetSelection (1, 1, false);

        Assert.Single (tableView.GetAllSelectedCells ());
        Assert.Equal (new (1, 1), tableView.GetAllSelectedCells ().Single ());
    }

    [Fact]
    public void GetAllSelectedCells_SquareSelection_FullRowSelect ()
    {
        var tableView = new TableView
        {
            Table = BuildTable (3, 3), MultiSelect = true, FullRowSelect = true, Viewport = new (0, 0, 10, 5)
        };
        tableView.BeginInit ();
        tableView.EndInit ();

        // move cursor to 1,1
        tableView.SetSelection (1, 1, false);

        // spread selection across to 2,2 (e.g. shift+right then shift+down)
        tableView.SetSelection (2, 2, true);

        Point [] selected = tableView.GetAllSelectedCells ().ToArray ();

        Assert.Equal (6, selected.Length);
        Assert.Equal (new (0, 1), selected [0]);
        Assert.Equal (new (1, 1), selected [1]);
        Assert.Equal (new (2, 1), selected [2]);
        Assert.Equal (new (0, 2), selected [3]);
        Assert.Equal (new (1, 2), selected [4]);
        Assert.Equal (new (2, 2), selected [5]);
    }

    [Fact]
    public void GetAllSelectedCells_SquareSelection_ReturnsFour ()
    {
        var tableView = new TableView
        {
            Table = BuildTable (3, 3), MultiSelect = true, Viewport = new (0, 0, 10, 5)
        };
        tableView.BeginInit ();
        tableView.EndInit ();

        // move cursor to 1,1
        tableView.SetSelection (1, 1, false);

        // spread selection across to 2,2 (e.g. shift+right then shift+down)
        tableView.SetSelection (2, 2, true);

        Point [] selected = tableView.GetAllSelectedCells ().ToArray ();

        Assert.Equal (4, selected.Length);
        Assert.Equal (new (1, 1), selected [0]);
        Assert.Equal (new (2, 1), selected [1]);
        Assert.Equal (new (1, 2), selected [2]);
        Assert.Equal (new (2, 2), selected [3]);
    }

    [Fact]
    public void GetAllSelectedCells_TwoIsolatedSelections_ReturnsSix ()
    {
        var tableView = new TableView
        {
            Table = BuildTable (20, 20), MultiSelect = true, Viewport = new (0, 0, 10, 5)
        };
        tableView.BeginInit ();
        tableView.EndInit ();

        /*
            Sets up disconnected selections like:

            00000000000
            01100000000
            01100000000
            00000001100
            00000000000
        */

        tableView.MultiSelectedRegions.Clear ();
        tableView.MultiSelectedRegions.Push (new (new (1, 1), new (1, 1, 2, 2)));
        tableView.MultiSelectedRegions.Push (new (new (7, 3), new (7, 3, 2, 1)));

        tableView.SelectedColumn = 8;
        tableView.SelectedRow = 3;

        Point [] selected = tableView.GetAllSelectedCells ().ToArray ();

        Assert.Equal (6, selected.Length);

        Assert.Equal (new (1, 1), selected [0]);
        Assert.Equal (new (2, 1), selected [1]);
        Assert.Equal (new (1, 2), selected [2]);
        Assert.Equal (new (2, 2), selected [3]);
        Assert.Equal (new (7, 3), selected [4]);
        Assert.Equal (new (8, 3), selected [5]);
    }

    [Fact]
    public void IsSelected_MultiSelectionOn_BoxSelection ()
    {
        var tableView = new TableView { Table = BuildTable (25, 50), MultiSelect = true };

        // 4 cell horizontal in box 2x2
        tableView.SetSelection (0, 0, false);
        tableView.SetSelection (1, 1, true);

        Assert.True (tableView.IsSelected (0, 0));
        Assert.True (tableView.IsSelected (1, 0));
        Assert.False (tableView.IsSelected (2, 0));

        Assert.True (tableView.IsSelected (0, 1));
        Assert.True (tableView.IsSelected (1, 1));
        Assert.False (tableView.IsSelected (2, 1));

        Assert.False (tableView.IsSelected (0, 2));
        Assert.False (tableView.IsSelected (1, 2));
        Assert.False (tableView.IsSelected (2, 2));
    }

    [Fact]
    public void IsSelected_MultiSelectionOn_Horizontal ()
    {
        var tableView = new TableView { Table = BuildTable (25, 50), MultiSelect = true };

        // 2 cell horizontal selection
        tableView.SetSelection (1, 0, false);
        tableView.SetSelection (2, 0, true);

        Assert.False (tableView.IsSelected (0, 0));
        Assert.True (tableView.IsSelected (1, 0));
        Assert.True (tableView.IsSelected (2, 0));
        Assert.False (tableView.IsSelected (3, 0));

        Assert.False (tableView.IsSelected (0, 1));
        Assert.False (tableView.IsSelected (1, 1));
        Assert.False (tableView.IsSelected (2, 1));
        Assert.False (tableView.IsSelected (3, 1));
    }

    [Fact]
    public void IsSelected_MultiSelectionOn_Vertical ()
    {
        var tableView = new TableView { Table = BuildTable (25, 50), MultiSelect = true };

        // 3 cell vertical selection
        tableView.SetSelection (1, 1, false);
        tableView.SetSelection (1, 3, true);

        Assert.False (tableView.IsSelected (0, 0));
        Assert.False (tableView.IsSelected (1, 0));
        Assert.False (tableView.IsSelected (2, 0));

        Assert.False (tableView.IsSelected (0, 1));
        Assert.True (tableView.IsSelected (1, 1));
        Assert.False (tableView.IsSelected (2, 1));

        Assert.False (tableView.IsSelected (0, 2));
        Assert.True (tableView.IsSelected (1, 2));
        Assert.False (tableView.IsSelected (2, 2));

        Assert.False (tableView.IsSelected (0, 3));
        Assert.True (tableView.IsSelected (1, 3));
        Assert.False (tableView.IsSelected (2, 3));

        Assert.False (tableView.IsSelected (0, 4));
        Assert.False (tableView.IsSelected (1, 4));
        Assert.False (tableView.IsSelected (2, 4));
    }

    [Fact]
    [AutoInitShutdown]
    public void LongColumnTest ()
    {
        var tableView = new TableView ();

        var top = new Toplevel ();
        top.Add (tableView);
        Application.Begin (top);

        tableView.ColorScheme = Colors.ColorSchemes ["TopLevel"];

        // 25 characters can be printed into table
        tableView.Viewport = new (0, 0, 25, 5);
        tableView.Style.ShowHorizontalHeaderUnderline = true;
        tableView.Style.ShowHorizontalHeaderOverline = false;
        tableView.Style.AlwaysShowHeaders = true;
        tableView.Style.SmoothHorizontalScrolling = true;

        var dt = new DataTable ();
        dt.Columns.Add ("A");
        dt.Columns.Add ("B");
        dt.Columns.Add ("Very Long Column");

        dt.Rows.Add (1, 2, new string ('a', 500));
        dt.Rows.Add (1, 2, "aaa");

        tableView.Table = new DataTableSource (dt);
        tableView.LayoutSubviews ();
        tableView.Draw ();

        // default behaviour of TableView is not to render
        // columns unless there is sufficient space
        var expected =
            @"
│A│B                    │
├─┼─────────────────────►
│1│2                    │
│1│2                    │
";

        TestHelpers.AssertDriverContentsAre (expected, output);

        // get a style for the long column
        ColumnStyle style = tableView.Style.GetOrCreateColumnStyle (2);

        // one way the API user can fix this for long columns
        // is to specify a MinAcceptableWidth for the column
        style.MaxWidth = 10;

        tableView.LayoutSubviews ();
        tableView.Draw ();

        expected =
            @"
│A│B│Very Long Column   │
├─┼─┼───────────────────┤
│1│2│aaaaaaaaaaaaaaaaaaa│
│1│2│aaa                │
";
        TestHelpers.AssertDriverContentsAre (expected, output);

        // revert the style change
        style.MaxWidth = TableView.DefaultMaxCellWidth;

        // another way API user can fix problem is to implement
        // RepresentationGetter and apply max length there

        style.RepresentationGetter = s => { return s.ToString ().Length < 15 ? s.ToString () : s.ToString ().Substring (0, 13) + "..."; };

        tableView.LayoutSubviews ();
        tableView.Draw ();

        expected =
            @"
│A│B│Very Long Column   │
├─┼─┼───────────────────┤
│1│2│aaaaaaaaaaaaa...   │
│1│2│aaa                │
";
        TestHelpers.AssertDriverContentsAre (expected, output);

        // revert style change
        style.RepresentationGetter = null;

        // Both of the above methods rely on having a fixed
        // size limit for the column.  These are awkward if a
        // table is resizeable e.g. Dim.Fill().  Ideally we want
        // to render in any space available and truncate the content
        // of the column dynamically so it fills the free space at
        // the end of the table.

        // We can now specify that the column can be any length
        // (Up to MaxWidth) but the renderer can accept using
        // less space down to this limit
        style.MinAcceptableWidth = 5;

        tableView.LayoutSubviews ();
        tableView.Draw ();

        expected =
            @"
│A│B│Very Long Column   │
├─┼─┼───────────────────┤
│1│2│aaaaaaaaaaaaaaaaaaa│
│1│2│aaa                │
";
        TestHelpers.AssertDriverContentsAre (expected, output);

        // Now test making the width too small for the MinAcceptableWidth
        // the Column won't fit so should not be rendered
        var driver = (FakeDriver)Application.Driver;
        driver.ClearContents ();

        tableView.Viewport = new (0, 0, 9, 5);
        tableView.LayoutSubviews ();
        tableView.Draw ();

        expected =
            @"
│A│B    │
├─┼─────►
│1│2    │
│1│2    │

";
        TestHelpers.AssertDriverContentsAre (expected, output);

        // setting width to 10 leaves just enough space for the column to
        // meet MinAcceptableWidth of 5.  Column width includes terminator line
        // symbol (e.g. ┤ or │)
        tableView.Viewport = new (0, 0, 10, 5);
        tableView.LayoutSubviews ();
        tableView.Draw ();

        expected =
            @"
│A│B│Very│
├─┼─┼────┤
│1│2│aaaa│
│1│2│aaa │
";
        TestHelpers.AssertDriverContentsAre (expected, output);

        tableView.Viewport = new (0, 0, 25, 5);

        // revert style change
        style.MinAcceptableWidth = TableView.DefaultMinAcceptableWidth;

        // Now let's test the global MaxCellWidth and MinCellWidth
        tableView.Style.ExpandLastColumn = false;
        tableView.MaxCellWidth = 10;
        tableView.MinCellWidth = 3;

        tableView.LayoutSubviews ();
        tableView.Draw ();

        expected =
            @"
│A  │B  │Very Long │    │
├───┼───┼──────────┼────┤
│1  │2  │aaaaaaaaaa│    │
│1  │2  │aaa       │    │
";
        TestHelpers.AssertDriverContentsAre (expected, output);

        // MaxCellWidth limits MinCellWidth
        tableView.MaxCellWidth = 5;
        tableView.MinCellWidth = 10;

        tableView.LayoutSubviews ();
        tableView.Draw ();

        expected =
            @"
│A    │B    │Very │     │
├─────┼─────┼─────┼─────┤
│1    │2    │aaaaa│     │
│1    │2    │aaa  │     │
";
        TestHelpers.AssertDriverContentsAre (expected, output);

        top.Dispose ();
        Application.Shutdown ();
        top.Dispose ();
    }

    [AutoInitShutdown]
    [Fact]
    public void PageDown_ExcludesHeaders ()
    {
        var tableView = new TableView
        {
            Table = BuildTable (25, 50), MultiSelect = true, Viewport = new (0, 0, 10, 5)
        };

        // Header should take up 2 lines
        tableView.Style.ShowHorizontalHeaderOverline = false;
        tableView.Style.ShowHorizontalHeaderUnderline = true;
        tableView.Style.AlwaysShowHeaders = false;

        // ensure that TableView has the input focus
        var top = new Toplevel ();
        top.Add (tableView);
        Application.Begin (top);

        top.FocusDeepest (NavigationDirection.Forward, null);
        Assert.True (tableView.HasFocus);

        Assert.Equal (0, tableView.RowOffset);

        tableView.NewKeyDownEvent (Key.PageDown);

        // window height is 5 rows 2 are header so page down should give 3 new rows
        Assert.Equal (3, tableView.SelectedRow);
        Assert.Equal (1, tableView.RowOffset);

        // header is no longer visible so page down should give 5 new rows
        tableView.NewKeyDownEvent (Key.PageDown);

        Assert.Equal (8, tableView.SelectedRow);
        Assert.Equal (4, tableView.RowOffset);
        top.Dispose ();
    }

    [Fact]
    [SetupFakeDriver]
    public void Redraw_EmptyTable ()
    {
        var tableView = new TableView ();
        tableView.ColorScheme = new ();
        tableView.Viewport = new (0, 0, 25, 10);

        // Set a table with 1 column
        tableView.Table = BuildTable (1, 50, out DataTable dt);
        tableView.Draw ();

        dt.Columns.Remove (dt.Columns [0]);
        tableView.Draw ();
    }

    [Fact]
    public void ScrollDown_OneLineAtATime ()
    {
        var tableView = new TableView ();
        tableView.BeginInit ();
        tableView.EndInit ();

        // Set big table
        tableView.Table = BuildTable (25, 50);

        // 1 header + 4 rows visible
        tableView.Viewport = new (0, 0, 25, 5);
        tableView.Style.ShowHorizontalHeaderUnderline = false;
        tableView.Style.ShowHorizontalHeaderOverline = false;
        tableView.Style.AlwaysShowHeaders = true;

        // select last row
        tableView.SelectedRow = 3; // row is 0 indexed so this is the 4th visible row

        // Scroll down
        tableView.NewKeyDownEvent (new () { KeyCode = KeyCode.CursorDown });

        // Scrolled off the page by 1 row so it should only have moved down 1 line of RowOffset
        Assert.Equal (4, tableView.SelectedRow);
        Assert.Equal (1, tableView.RowOffset);
    }

    [Fact]
    [SetupFakeDriver]
    public void ScrollIndicators ()
    {
        var tableView = new TableView ();
        tableView.BeginInit ();
        tableView.EndInit ();

        tableView.ColorScheme = Colors.ColorSchemes ["TopLevel"];

        // 3 columns are visibile
        tableView.Viewport = new (0, 0, 7, 5);
        tableView.Style.ShowHorizontalHeaderUnderline = true;
        tableView.Style.ShowHorizontalHeaderOverline = false;
        tableView.Style.AlwaysShowHeaders = true;
        tableView.Style.SmoothHorizontalScrolling = true;

        var dt = new DataTable ();
        dt.Columns.Add ("A");
        dt.Columns.Add ("B");
        dt.Columns.Add ("C");
        dt.Columns.Add ("D");
        dt.Columns.Add ("E");
        dt.Columns.Add ("F");

        dt.Rows.Add (1, 2, 3, 4, 5, 6);

        tableView.Table = new DataTableSource (dt);

        // select last visible column
        tableView.SelectedColumn = 2; // column C

        tableView.Draw ();

        // user can only scroll right so sees right indicator
        // Because first column in table is A
        var expected =
            @"
│A│B│C│
├─┼─┼─►
│1│2│3│";

        TestHelpers.AssertDriverContentsAre (expected, output);

        // Scroll right
        tableView.NewKeyDownEvent (new () { KeyCode = KeyCode.CursorRight });

        // since A is now pushed off screen we get indicator showing
        // that user can scroll left to see first column
        tableView.Draw ();

        expected =
            @"
│B│C│D│
◄─┼─┼─►
│2│3│4│";

        TestHelpers.AssertDriverContentsAre (expected, output);

        // Scroll right twice more (to end of columns)
        tableView.NewKeyDownEvent (new () { KeyCode = KeyCode.CursorRight });
        tableView.NewKeyDownEvent (new () { KeyCode = KeyCode.CursorRight });

        tableView.Draw ();

        expected =
            @"
│D│E│F│
◄─┼─┼─┤
│4│5│6│";

        TestHelpers.AssertDriverContentsAre (expected, output);

        // Shutdown must be called to safely clean up Application if Init has been called
        Application.Shutdown ();
    }

    [Fact]
    [SetupFakeDriver]
    public void ScrollRight_SmoothScrolling ()
    {
        var tableView = new TableView ();
        tableView.BeginInit ();
        tableView.EndInit ();

        tableView.ColorScheme = Colors.ColorSchemes ["TopLevel"];
        tableView.LayoutSubviews ();

        // 3 columns are visibile
        tableView.Viewport = new (0, 0, 7, 5);
        tableView.Style.ShowHorizontalHeaderUnderline = false;
        tableView.Style.ShowHorizontalHeaderOverline = false;
        tableView.Style.AlwaysShowHeaders = true;
        tableView.Style.SmoothHorizontalScrolling = true;

        var dt = new DataTable ();
        dt.Columns.Add ("A");
        dt.Columns.Add ("B");
        dt.Columns.Add ("C");
        dt.Columns.Add ("D");
        dt.Columns.Add ("E");
        dt.Columns.Add ("F");

        dt.Rows.Add (1, 2, 3, 4, 5, 6);

        tableView.Table = new DataTableSource (dt);

        // select last visible column
        tableView.SelectedColumn = 2; // column C

        tableView.Draw ();

        var expected =
            @"
│A│B│C│
│1│2│3│";

        TestHelpers.AssertDriverContentsAre (expected, output);

        // Scroll right
        tableView.NewKeyDownEvent (new () { KeyCode = KeyCode.CursorRight });

        tableView.Draw ();

        // Note that with SmoothHorizontalScrolling only a single new column
        // is exposed when scrolling right.  This is not always the case though
        // sometimes if the leftmost column is long (i.e. A is a long column)
        // then when A is pushed off the screen multiple new columns could be exposed
        // (not just D but also E and F).  This is because TableView never shows
        // 'half cells' or scrolls by console unit (scrolling is done by table row/column increments).

        expected =
            @"
│B│C│D│
│2│3│4│";

        TestHelpers.AssertDriverContentsAre (expected, output);
    }

    [Fact]
    [SetupFakeDriver]
    public void ScrollRight_WithoutSmoothScrolling ()
    {
        var tableView = new TableView ();
        tableView.BeginInit ();
        tableView.EndInit ();
        tableView.ColorScheme = Colors.ColorSchemes ["TopLevel"];

        // 3 columns are visibile
        tableView.Viewport = new (0, 0, 7, 5);
        tableView.Style.ShowHorizontalHeaderUnderline = false;
        tableView.Style.ShowHorizontalHeaderOverline = false;
        tableView.Style.AlwaysShowHeaders = true;
        tableView.Style.SmoothHorizontalScrolling = false;

        var dt = new DataTable ();
        dt.Columns.Add ("A");
        dt.Columns.Add ("B");
        dt.Columns.Add ("C");
        dt.Columns.Add ("D");
        dt.Columns.Add ("E");
        dt.Columns.Add ("F");

        dt.Rows.Add (1, 2, 3, 4, 5, 6);

        tableView.Table = new DataTableSource (dt);

        // select last visible column
        tableView.SelectedColumn = 2; // column C

        tableView.Draw ();

        var expected =
            @"
│A│B│C│
│1│2│3│";

        TestHelpers.AssertDriverContentsAre (expected, output);

        // Scroll right
        tableView.NewKeyDownEvent (new () { KeyCode = KeyCode.CursorRight });

        tableView.Draw ();

        // notice that without smooth scrolling we just update the first column
        // rendered in the table to the newly exposed column (D).  This is fast
        // since we don't have to worry about repeatedly measuring the content
        // area as we scroll until the new column (D) is exposed.  But it makes
        // the view 'jump' to expose all new columns

        expected =
            @"
│D│E│F│
│4│5│6│";

        TestHelpers.AssertDriverContentsAre (expected, output);

    }

    [Fact]
    public void SelectedCellChanged_NotFiredForSameValue ()
    {
        var tableView = new TableView { Table = BuildTable (25, 50) };

        var called = false;
        tableView.SelectedCellChanged += (s, e) => { called = true; };

        Assert.Equal (0, tableView.SelectedColumn);
        Assert.False (called);

        // Changing value to same as it already was should not raise an event
        tableView.SelectedColumn = 0;

        Assert.False (called);

        tableView.SelectedColumn = 10;
        Assert.True (called);
    }

    [Fact]
    public void SelectedCellChanged_SelectedColumnIndexesCorrect ()
    {
        var tableView = new TableView { Table = BuildTable (25, 50) };

        var called = false;

        tableView.SelectedCellChanged += (s, e) =>
                                         {
                                             called = true;
                                             Assert.Equal (0, e.OldCol);
                                             Assert.Equal (10, e.NewCol);
                                         };

        tableView.SelectedColumn = 10;
        Assert.True (called);
    }

    [Fact]
    public void SelectedCellChanged_SelectedRowIndexesCorrect ()
    {
        var tableView = new TableView { Table = BuildTable (25, 50) };

        var called = false;

        tableView.SelectedCellChanged += (s, e) =>
                                         {
                                             called = true;
                                             Assert.Equal (0, e.OldRow);
                                             Assert.Equal (10, e.NewRow);
                                         };

        tableView.SelectedRow = 10;
        Assert.True (called);
    }

    [Fact]
    [SetupFakeDriver]
    public void ShowHorizontalBottomLine_NoCellLines ()
    {
        TableView tableView = GetABCDEFTableView (out _);

        tableView.ColorScheme = Colors.ColorSchemes ["TopLevel"];

        // 3 columns are visibile
        tableView.Viewport = new (0, 0, 7, 5);
        tableView.Style.ShowHorizontalHeaderUnderline = true;
        tableView.Style.ShowHorizontalHeaderOverline = false;
        tableView.Style.AlwaysShowHeaders = true;
        tableView.Style.SmoothHorizontalScrolling = true;
        tableView.Style.ShowHorizontalBottomline = true;
        tableView.Style.ShowVerticalCellLines = false;

        tableView.Draw ();

        // user can only scroll right so sees right indicator
        // Because first column in table is A
        var expected =
            @"
│A│B│C│
└─┴─┴─►
 1 2 3
───────";

        TestHelpers.AssertDriverContentsAre (expected, output);
    }

    [Fact]
    [SetupFakeDriver]
    public void ShowHorizontalBottomLine_WithVerticalCellLines ()
    {
        TableView tableView = GetABCDEFTableView (out _);

        tableView.ColorScheme = Colors.ColorSchemes ["TopLevel"];

        // 3 columns are visibile
        tableView.Viewport = new (0, 0, 7, 5);
        tableView.Style.ShowHorizontalHeaderUnderline = true;
        tableView.Style.ShowHorizontalHeaderOverline = false;
        tableView.Style.AlwaysShowHeaders = true;
        tableView.Style.SmoothHorizontalScrolling = true;
        tableView.Style.ShowHorizontalBottomline = true;

        tableView.Draw ();

        // user can only scroll right so sees right indicator
        // Because first column in table is A
        var expected =
            @"
│A│B│C│
├─┼─┼─►
│1│2│3│
└─┴─┴─┘";

        TestHelpers.AssertDriverContentsAre (expected, output);
    }

    [Fact]
    [AutoInitShutdown]
    public void TableView_Activate ()
    {
        string activatedValue = null;
        var tv = new TableView (BuildTable (1, 1));
        tv.CellActivated += (s, c) => activatedValue = c.Table [c.Row, c.Col].ToString ();

        var top = new Toplevel ();
        top.Add (tv);
        Application.Begin (top);

        // pressing enter should activate the first cell (selected cell)
        tv.NewKeyDownEvent (Key.Enter);
        Assert.Equal ("R0C0", activatedValue);

        // reset the test
        activatedValue = null;

        // clear keybindings and ensure that Enter does not trigger the event anymore
        tv.KeyBindings.Clear ();
        tv.NewKeyDownEvent (Key.Enter);
        Assert.Null (activatedValue);

        // New method for changing the activation key
        tv.KeyBindings.Add (Key.Z, Command.Accept);
        tv.NewKeyDownEvent (Key.Z);
        Assert.Equal ("R0C0", activatedValue);

        // reset the test
        activatedValue = null;
        tv.KeyBindings.Clear ();

        // Old method for changing the activation key
        tv.CellActivationKey = KeyCode.Z;
        tv.NewKeyDownEvent (Key.Z);
        Assert.Equal ("R0C0", activatedValue);
        top.Dispose ();
    }

    [Theory]
    [SetupFakeDriver]
    [InlineData (false)]
    [InlineData (true)]
    public void TableView_ColorsTest_ColorGetter (bool focused)
    {
        TableView tv = SetUpMiniTable (out DataTable dt);

        tv.LayoutSubviews ();

        // width exactly matches the max col widths
        tv.Viewport = new (0, 0, 5, 4);

        // Create a style for column B
        ColumnStyle bStyle = tv.Style.GetOrCreateColumnStyle (1);

        // when B is 2 use the custom highlight color
        var cellHighlight = new ColorScheme
        {
            Normal = new (Color.BrightCyan, Color.DarkGray),
            HotNormal = new (Color.Green, Color.Blue),
            Focus = new (Color.Cyan, Color.Magenta),

            // Not used by TableView
            HotFocus = new (Color.BrightYellow, Color.White)
        };

        bStyle.ColorGetter = a => Convert.ToInt32 (a.CellValue) == 2 ? cellHighlight : null;

        tv.HasFocus = focused;
        Assert.Equal(focused, tv.HasFocus);

        tv.Draw ();

        var expected = @"
┌─┬─┐
│A│B│
├─┼─┤
│1│2│
";
        TestHelpers.AssertDriverContentsAre (expected, output);

        var expectedColors = @"
00000
00000
00000
01020
";

        TestHelpers.AssertDriverAttributesAre (
                                               expectedColors,
                                               Application.Driver,
                                               tv.ColorScheme.Normal,
                                               focused ? tv.ColorScheme.Focus : tv.ColorScheme.HotNormal,
                                               cellHighlight.Normal
                                              );

        // change the value in the table so that
        // it no longer matches the ColorGetter
        // delegate conditional ( which checks for
        // the value 2)
        dt.Rows [0] [1] = 5;

        tv.Draw ();

        expected = @"
┌─┬─┐
│A│B│
├─┼─┤
│1│5│
";
        TestHelpers.AssertDriverContentsAre (expected, output);

        expectedColors = @"
00000
00000
00000
01000
";

        // now we only see 2 colors used (the selected cell color and Normal
        // cellHighlight should no longer be used because the delegate returned null
        // (now that the cell value is 5 - which does not match the conditional)
        TestHelpers.AssertDriverAttributesAre (
                                               expectedColors,
                                               Application.Driver,
                                               tv.ColorScheme.Normal,
                                               focused ? tv.ColorScheme.Focus : tv.ColorScheme.HotNormal
                                              );
    }

    [Theory]
    [SetupFakeDriver]
    [InlineData (false)]
    [InlineData (true)]
    public void TableView_ColorsTest_RowColorGetter (bool focused)
    {
        TableView tv = SetUpMiniTable (out DataTable dt);
        tv.LayoutSubviews ();

        // width exactly matches the max col widths
        tv.Viewport = new (0, 0, 5, 4);

        var rowHighlight = new ColorScheme
        {
            Normal = new (Color.BrightCyan, Color.DarkGray),
            HotNormal = new (Color.Green, Color.Blue),
            Focus = new (Color.BrightYellow, Color.White),

            // Not used by TableView
            HotFocus = new (Color.Cyan, Color.Magenta)
        };

        // when B is 2 use the custom highlight color for the row
        tv.Style.RowColorGetter += e => Convert.ToInt32 (e.Table [e.RowIndex, 1]) == 2 ? rowHighlight : null;

        tv.HasFocus = focused;
        Assert.Equal (focused, tv.HasFocus);

        tv.Draw ();

        var expected = @"
┌─┬─┐
│A│B│
├─┼─┤
│1│2│
";
        TestHelpers.AssertDriverContentsAre (expected, output);

        var expectedColors = @"
00000
00000
00000
21222
";

        TestHelpers.AssertDriverAttributesAre (
                                               expectedColors,
                                               Application.Driver,
                                               tv.ColorScheme.Normal,
                                               focused ? rowHighlight.Focus : rowHighlight.HotNormal,
                                               rowHighlight.Normal
                                              );

        // change the value in the table so that
        // it no longer matches the RowColorGetter
        // delegate conditional ( which checks for
        // the value 2)
        dt.Rows [0] [1] = 5;

        tv.Draw ();

        expected = @"
┌─┬─┐
│A│B│
├─┼─┤
│1│5│
";
        TestHelpers.AssertDriverContentsAre (expected, output);

        expectedColors = @"
00000
00000
00000
01000
";

        // now we only see 2 colors used (the selected cell color and Normal
        // rowHighlight should no longer be used because the delegate returned null
        // (now that the cell value is 5 - which does not match the conditional)
        TestHelpers.AssertDriverAttributesAre (
                                               expectedColors,
                                               Application.Driver,
                                               tv.ColorScheme.Normal,
                                               focused ? tv.ColorScheme.Focus : tv.ColorScheme.HotNormal
                                              );
    }

    [Theory]
    [SetupFakeDriver]
    [InlineData (false)]
    [InlineData (true)]
    public void TableView_ColorTests_FocusedOrNot (bool focused)
    {
        TableView tv = SetUpMiniTable ();
        tv.LayoutSubviews ();

        // width exactly matches the max col widths
        tv.Viewport = new (0, 0, 5, 4);

        tv.HasFocus = focused;
        Assert.Equal (focused, tv.HasFocus);

        tv.Draw ();

        var expected = @"
┌─┬─┐
│A│B│
├─┼─┤
│1│2│
";
        TestHelpers.AssertDriverContentsAre (expected, output);

        var expectedColors = @"
00000
00000
00000
01000
";

        TestHelpers.AssertDriverAttributesAre (
                                               expectedColors,
                                               Application.Driver,
                                               tv.ColorScheme.Normal,
                                               focused ? tv.ColorScheme.Focus : tv.ColorScheme.HotNormal
                                              );

    }

    [Theory]
    [SetupFakeDriver]
    [InlineData (false)]
    [InlineData (true)]
    public void TableView_ColorTests_InvertSelectedCellFirstCharacter (bool focused)
    {
        TableView tv = SetUpMiniTable ();
        tv.Style.InvertSelectedCellFirstCharacter = true;
        tv.LayoutSubviews ();

        // width exactly matches the max col widths
        tv.Viewport = new (0, 0, 5, 4);

        tv.HasFocus = focused;
        Assert.Equal (focused, tv.HasFocus);

        tv.Draw ();

        var expected = @"
┌─┬─┐
│A│B│
├─┼─┤
│1│2│
";
        TestHelpers.AssertDriverContentsAre (expected, output);

        var expectedColors = @"
00000
00000
00000
01000
";

        var invertFocus = new Attribute (tv.ColorScheme.Focus.Background, tv.ColorScheme.Focus.Foreground);
        var invertHotNormal = new Attribute (tv.ColorScheme.HotNormal.Background, tv.ColorScheme.HotNormal.Foreground);

        TestHelpers.AssertDriverAttributesAre (
                                               expectedColors,
                                               Application.Driver,
                                               tv.ColorScheme.Normal,
                                               focused ? invertFocus : invertHotNormal
                                              );

    }

    [Fact]
    [SetupFakeDriver]
    public void TableView_ExpandLastColumn_False ()
    {
        TableView tv = SetUpMiniTable ();

        // the thing we are testing
        tv.Style.ExpandLastColumn = false;

        tv.Draw ();

        var expected = @"
┌─┬─┬────┐
│A│B│    │
├─┼─┼────┤
│1│2│    │
";
        TestHelpers.AssertDriverContentsAre (expected, output);

    }

    [Fact]
    [SetupFakeDriver]
    public void TableView_ExpandLastColumn_False_ExactBounds ()
    {
        TableView tv = SetUpMiniTable ();

        // the thing we are testing
        tv.Style.ExpandLastColumn = false;

        // width exactly matches the max col widths
        tv.Viewport = new (0, 0, 5, 4);

        tv.Draw ();

        var expected = @"
┌─┬─┐
│A│B│
├─┼─┤
│1│2│
";
        TestHelpers.AssertDriverContentsAre (expected, output);
    }

    [Fact]
    [SetupFakeDriver]
    public void TableView_ExpandLastColumn_True ()
    {
        TableView tv = SetUpMiniTable ();

        // the thing we are testing
        tv.Style.ExpandLastColumn = true;

        tv.Draw ();

        var expected = @"
┌─┬──────┐
│A│B     │
├─┼──────┤
│1│2     │
";
        TestHelpers.AssertDriverContentsAre (expected, output);
    }

    [Fact]
    [SetupFakeDriver]
    public void TableView_ShowHeadersFalse_AllLines ()
    {
        TableView tv = GetABCDEFTableView (out _);
        tv.Viewport = new (0, 0, 5, 5);

        tv.Style.ShowHeaders = false;
        tv.Style.ShowHorizontalHeaderOverline = true;
        tv.Style.ShowHorizontalHeaderUnderline = true;

        // Horizontal scrolling option is part of the underline
        tv.Style.ShowHorizontalScrollIndicators = true;

        tv.Draw ();

        var expected = @"
┌─┬─┐
├─┼─►
│1│2│
";
        TestHelpers.AssertDriverContentsAre (expected, output);
    }

    [Fact]
    [SetupFakeDriver]
    public void TableView_ShowHeadersFalse_AndNoHeaderLines ()
    {
        TableView tv = GetABCDEFTableView (out _);
        tv.Viewport = new (0, 0, 5, 5);

        tv.Style.ShowHeaders = false;
        tv.Style.ShowHorizontalHeaderOverline = false;
        tv.Style.ShowHorizontalHeaderUnderline = false;

        tv.Draw ();

        var expected = @"
│1│2│
";
        TestHelpers.AssertDriverContentsAre (expected, output);
    }

    [Fact]
    [SetupFakeDriver]
    public void TableView_ShowHeadersFalse_OverlineTrue ()
    {
        TableView tv = GetABCDEFTableView (out _);
        tv.Viewport = new (0, 0, 5, 5);

        tv.Style.ShowHeaders = false;
        tv.Style.ShowHorizontalHeaderOverline = true;
        tv.Style.ShowHorizontalHeaderUnderline = false;

        tv.Draw ();

        var expected = @"
┌─┬─┐
│1│2│
";
        TestHelpers.AssertDriverContentsAre (expected, output);
    }

    [Fact]
    [SetupFakeDriver]
    public void TableView_ShowHeadersFalse_UnderlineTrue ()
    {
        TableView tv = GetABCDEFTableView (out _);
        tv.Viewport = new (0, 0, 5, 5);

        tv.Style.ShowHeaders = false;
        tv.Style.ShowHorizontalHeaderOverline = false;
        tv.Style.ShowHorizontalHeaderUnderline = true;

        // Horizontal scrolling option is part of the underline
        tv.Style.ShowHorizontalScrollIndicators = true;

        tv.Draw ();

        var expected = @"
├─┼─►
│1│2│
";
        TestHelpers.AssertDriverContentsAre (expected, output);
    }

    [Fact]
    [SetupFakeDriver]
    public void TableViewMultiSelect_CannotFallOffBottom ()
    {
        TableView tv = SetUpMiniTable (out DataTable dt);
        dt.Rows.Add (1, 2); // add another row (brings us to 2 rows)

        tv.MultiSelect = true;
        tv.SelectedColumn = 0;
        tv.SelectedRow = 0;
        tv.NewKeyDownEvent (Key.CursorRight.WithShift);
        tv.NewKeyDownEvent (Key.CursorDown.WithShift);

        Assert.Equal (new (0, 0, 2, 2), tv.MultiSelectedRegions.Single ().Rectangle);

        // this next moves should be ignored because we already selected the whole table
        tv.NewKeyDownEvent (Key.CursorRight.WithShift);
        tv.NewKeyDownEvent (Key.CursorDown.WithShift);

        Assert.Equal (new (0, 0, 2, 2), tv.MultiSelectedRegions.Single ().Rectangle);
        Assert.Equal (1, tv.SelectedColumn);
        Assert.Equal (1, tv.SelectedRow);
    }

    [Fact]
    [SetupFakeDriver]
    public void TableViewMultiSelect_CannotFallOffLeft ()
    {
        TableView tv = SetUpMiniTable (out DataTable dt);
        dt.Rows.Add (1, 2); // add another row (brings us to 2 rows)

        tv.MultiSelect = true;
        tv.SelectedColumn = 1;
        tv.SelectedRow = 1;
        tv.NewKeyDownEvent (Key.CursorLeft.WithShift);

        Assert.Equal (new (0, 1, 2, 1), tv.MultiSelectedRegions.Single ().Rectangle);

        // this next shift left should be ignored because we are already at the bounds
        tv.NewKeyDownEvent (Key.CursorLeft.WithShift);

        Assert.Equal (new (0, 1, 2, 1), tv.MultiSelectedRegions.Single ().Rectangle);

        Assert.Equal (0, tv.SelectedColumn);
        Assert.Equal (1, tv.SelectedRow);
    }

    [Fact]
    [SetupFakeDriver]
    public void TableViewMultiSelect_CannotFallOffRight ()
    {
        TableView tv = SetUpMiniTable (out DataTable dt);
        dt.Rows.Add (1, 2); // add another row (brings us to 2 rows)

        tv.MultiSelect = true;
        tv.SelectedColumn = 0;
        tv.SelectedRow = 1;
        tv.NewKeyDownEvent (Key.CursorRight.WithShift);

        Assert.Equal (new (0, 1, 2, 1), tv.MultiSelectedRegions.Single ().Rectangle);

        // this next shift right should be ignored because we are already at the right bounds
        tv.NewKeyDownEvent (Key.CursorRight.WithShift);

        Assert.Equal (new (0, 1, 2, 1), tv.MultiSelectedRegions.Single ().Rectangle);

        Assert.Equal (1, tv.SelectedColumn);
        Assert.Equal (1, tv.SelectedRow);
    }

    [Fact]
    [SetupFakeDriver]
    public void TableViewMultiSelect_CannotFallOffTop ()
    {
        TableView tv = SetUpMiniTable (out DataTable dt);
        dt.Rows.Add (1, 2); // add another row (brings us to 2 rows)
        tv.LayoutSubviews ();

        tv.MultiSelect = true;
        tv.SelectedColumn = 1;
        tv.SelectedRow = 1;
        tv.NewKeyDownEvent (Key.CursorLeft.WithShift);
        tv.NewKeyDownEvent (Key.CursorUp.WithShift);

        Assert.Equal (new (0, 0, 2, 2), tv.MultiSelectedRegions.Single ().Rectangle);

        // this next moves should be ignored because we already selected the whole table
        tv.NewKeyDownEvent (Key.CursorLeft.WithShift);
        tv.NewKeyDownEvent (Key.CursorUp.WithShift);

        Assert.Equal (new (0, 0, 2, 2), tv.MultiSelectedRegions.Single ().Rectangle);
        Assert.Equal (0, tv.SelectedColumn);
        Assert.Equal (0, tv.SelectedRow);

    }

    [Fact]
    [AutoInitShutdown]
    public void Test_CollectionNavigator ()
    {
        var tv = new TableView ();
        tv.ColorScheme = Colors.ColorSchemes ["TopLevel"];
        tv.Viewport = new (0, 0, 50, 7);

        tv.Table = new EnumerableTableSource<string> (
                                                      new [] { "fish", "troll", "trap", "zoo" },
                                                      new () { { "Name", t => t }, { "EndsWith", t => t.Last () } }
                                                     );

        tv.LayoutSubviews ();

        tv.Draw ();

        var expected =
            @"
┌─────┬──────────────────────────────────────────┐
│Name │EndsWith                                  │
├─────┼──────────────────────────────────────────┤
│fish │h                                         │
│troll│l                                         │
│trap │p                                         │
│zoo  │o                                         │";

        TestHelpers.AssertDriverContentsAre (expected, output);

        Assert.Equal (0, tv.SelectedRow);

        // this test assumes no focus
        Assert.False (tv.HasFocus);

        // already on fish
        tv.NewKeyDownEvent (new () { KeyCode = KeyCode.F });
        Assert.Equal (0, tv.SelectedRow);

        // not focused
        tv.NewKeyDownEvent (new () { KeyCode = KeyCode.Z });
        Assert.Equal (0, tv.SelectedRow);

        // ensure that TableView has the input focus
        var top = new Toplevel ();
        top.Add (tv);
        Application.Begin (top);

        top.FocusDeepest (NavigationDirection.Forward, null);
        Assert.True (tv.HasFocus);

        // already on fish
        tv.NewKeyDownEvent (new () { KeyCode = KeyCode.F });
        Assert.Equal (0, tv.SelectedRow);

        // move to zoo
        tv.NewKeyDownEvent (new () { KeyCode = KeyCode.Z });
        Assert.Equal (3, tv.SelectedRow);

        // move to troll
        tv.NewKeyDownEvent (new () { KeyCode = KeyCode.T });
        Assert.Equal (1, tv.SelectedRow);

        // move to trap
        tv.NewKeyDownEvent (new () { KeyCode = KeyCode.T });
        Assert.Equal (2, tv.SelectedRow);

        // change columns to navigate by column 2
        Assert.Equal (0, tv.SelectedColumn);
        Assert.Equal (2, tv.SelectedRow);
        tv.NewKeyDownEvent (new () { KeyCode = KeyCode.CursorRight });
        Assert.Equal (1, tv.SelectedColumn);
        Assert.Equal (2, tv.SelectedRow);

        // nothing ends with t so stay where you are
        tv.NewKeyDownEvent (new () { KeyCode = KeyCode.T });
        Assert.Equal (2, tv.SelectedRow);

        //jump to fish which ends in h
        tv.NewKeyDownEvent (new () { KeyCode = KeyCode.H });
        Assert.Equal (0, tv.SelectedRow);

        // jump to zoo which ends in o
        tv.NewKeyDownEvent (new () { KeyCode = KeyCode.O });
        Assert.Equal (3, tv.SelectedRow);
        top.Dispose ();
    }

    [Fact]
    [SetupFakeDriver]
    public void Test_ScreenToCell ()
    {
        TableView tableView = GetTwoRowSixColumnTable ();
        tableView.BeginInit ();
        tableView.EndInit ();
        tableView.LayoutSubviews ();

        tableView.Draw ();

        // user can only scroll right so sees right indicator
        // Because first column in table is A
        var expected =
            @"
│A│B│C│
├─┼─┼─►
│1│2│3│
│1│2│3│";

        TestHelpers.AssertDriverContentsAre (expected, output);

        // ---------------- X=0 -----------------------
        // click is before first cell
        Assert.Null (tableView.ScreenToCell (0, 0));
        Assert.Null (tableView.ScreenToCell (0, 1));
        Assert.Null (tableView.ScreenToCell (0, 2));
        Assert.Null (tableView.ScreenToCell (0, 3));
        Assert.Null (tableView.ScreenToCell (0, 4));

        // ---------------- X=1 -----------------------
        // click in header
        Assert.Null (tableView.ScreenToCell (1, 0));

        // click in header row line
        Assert.Null (tableView.ScreenToCell (1, 1));

        // click in cell 0,0
        Assert.Equal (Point.Empty, tableView.ScreenToCell (1, 2));

        // click in cell 0,1
        Assert.Equal (new Point (0, 1), tableView.ScreenToCell (1, 3));

        // after last row
        Assert.Null (tableView.ScreenToCell (1, 4));

        // ---------------- X=2 -----------------------
        // ( even though there is a horizontal dividing line here we treat it as a hit on the cell before)
        // click in header
        Assert.Null (tableView.ScreenToCell (2, 0));

        // click in header row line
        Assert.Null (tableView.ScreenToCell (2, 1));

        // click in cell 0,0
        Assert.Equal (Point.Empty, tableView.ScreenToCell (2, 2));

        // click in cell 0,1
        Assert.Equal (new Point (0, 1), tableView.ScreenToCell (2, 3));

        // after last row
        Assert.Null (tableView.ScreenToCell (2, 4));

        // ---------------- X=3 -----------------------
        // click in header
        Assert.Null (tableView.ScreenToCell (3, 0));

        // click in header row line
        Assert.Null (tableView.ScreenToCell (3, 1));

        // click in cell 1,0
        Assert.Equal (new Point (1, 0), tableView.ScreenToCell (3, 2));

        // click in cell 1,1
        Assert.Equal (new Point (1, 1), tableView.ScreenToCell (3, 3));

        // after last row
        Assert.Null (tableView.ScreenToCell (3, 4));
    }

    [Fact]
    [SetupFakeDriver]
    public void Test_ScreenToCell_DataColumnOverload ()
    {
        TableView tableView = GetTwoRowSixColumnTable ();
        tableView.LayoutSubviews ();

        tableView.Draw ();

        // user can only scroll right so sees right indicator
        // Because first column in table is A
        var expected =
            @"
│A│B│C│
├─┼─┼─►
│1│2│3│
│1│2│3│";

        TestHelpers.AssertDriverContentsAre (expected, output);
        int? col;

        // ---------------- X=0 -----------------------
        // click is before first cell
        Assert.Null (tableView.ScreenToCell (0, 0, out col));
        Assert.Null (col);
        Assert.Null (tableView.ScreenToCell (0, 1, out col));
        Assert.Null (col);
        Assert.Null (tableView.ScreenToCell (0, 2, out col));
        Assert.Null (col);
        Assert.Null (tableView.ScreenToCell (0, 3, out col));
        Assert.Null (col);
        Assert.Null (tableView.ScreenToCell (0, 4, out col));
        Assert.Null (col);

        // ---------------- X=1 -----------------------
        // click in header
        Assert.Null (tableView.ScreenToCell (1, 0, out col));
        Assert.Equal ("A", tableView.Table.ColumnNames [col.Value]);

        // click in header row line  (click in the horizontal line below header counts as click in header above - consistent with the column hit box)
        Assert.Null (tableView.ScreenToCell (1, 1, out col));
        Assert.Equal ("A", tableView.Table.ColumnNames [col.Value]);

        // click in cell 0,0
        Assert.Equal (Point.Empty, tableView.ScreenToCell (1, 2, out col));
        Assert.Null (col);

        // click in cell 0,1
        Assert.Equal (new Point (0, 1), tableView.ScreenToCell (1, 3, out col));
        Assert.Null (col);

        // after last row
        Assert.Null (tableView.ScreenToCell (1, 4, out col));
        Assert.Null (col);

        // ---------------- X=2 -----------------------
        // click in header
        Assert.Null (tableView.ScreenToCell (2, 0, out col));
        Assert.Equal ("A", tableView.Table.ColumnNames [col.Value]);

        // click in header row line
        Assert.Null (tableView.ScreenToCell (2, 1, out col));
        Assert.Equal ("A", tableView.Table.ColumnNames [col.Value]);

        // click in cell 0,0
        Assert.Equal (Point.Empty, tableView.ScreenToCell (2, 2, out col));
        Assert.Null (col);

        // click in cell 0,1
        Assert.Equal (new Point (0, 1), tableView.ScreenToCell (2, 3, out col));
        Assert.Null (col);

        // after last row
        Assert.Null (tableView.ScreenToCell (2, 4, out col));
        Assert.Null (col);

        // ---------------- X=3 -----------------------
        // click in header
        Assert.Null (tableView.ScreenToCell (3, 0, out col));
        Assert.Equal ("B", tableView.Table.ColumnNames [col.Value]);

        // click in header row line
        Assert.Null (tableView.ScreenToCell (3, 1, out col));
        Assert.Equal ("B", tableView.Table.ColumnNames [col.Value]);

        // click in cell 1,0
        Assert.Equal (new Point (1, 0), tableView.ScreenToCell (3, 2, out col));
        Assert.Null (col);

        // click in cell 1,1
        Assert.Equal (new Point (1, 1), tableView.ScreenToCell (3, 3, out col));
        Assert.Null (col);

        // after last row
        Assert.Null (tableView.ScreenToCell (3, 4, out col));
        Assert.Null (col);
    }

    [Fact]
    public void Test_SumColumnWidth_UnicodeLength ()
    {
        Assert.Equal (11, "hello there".EnumerateRunes ().Sum (c => c.GetColumns ()));

        // Creates a string with the peculiar (french?) r symbol
        string surrogate = "Les Mise" + char.ConvertFromUtf32 (int.Parse ("0301", NumberStyles.HexNumber)) + "rables";

        // The unicode width of this string is shorter than the string length! 
        Assert.Equal (14, surrogate.EnumerateRunes ().Sum (c => c.GetColumns ()));
        Assert.Equal (15, surrogate.Length);
    }

    [Fact]
    [SetupFakeDriver]
    public void TestColumnStyle_AllColumnsVisibleFalse_BehavesAsTableNull ()
    {
        TableView tableView = GetABCDEFTableView (out DataTable dt);

        for (var i = 0; i < 6; i++)
        {
            tableView.Style.GetOrCreateColumnStyle (i).Visible = false;
        }

        tableView.LayoutSubviews ();

        // expect nothing to be rendered when all columns are invisible
        var expected =
            @"
";

        tableView.Draw ();
        TestHelpers.AssertDriverContentsAre (expected, output);

        // expect behavior to match when Table is null
        tableView.Table = null;

        tableView.Draw ();
        TestHelpers.AssertDriverContentsAre (expected, output);
    }

    [InlineData (true)]
    [InlineData (false)]
    [Theory]
    [SetupFakeDriver]
    public void TestColumnStyle_FirstColumnVisibleFalse_CursorStaysAt1 (bool useHome)
    {
        TableView tableView = GetABCDEFTableView (out DataTable dt);
        tableView.LayoutSubviews ();

        tableView.Style.GetOrCreateColumnStyle (0).Visible = false;
        tableView.SelectedColumn = 0;

        Assert.Equal (0, tableView.SelectedColumn);

        // column 0 is invisible so this method should move to 1
        tableView.EnsureValidSelection ();
        Assert.Equal (1, tableView.SelectedColumn);

        tableView.NewKeyDownEvent (
                                   new () { KeyCode = useHome ? KeyCode.Home : KeyCode.CursorLeft }
                                  );

        // Expect the cursor to stay at 1
        Assert.Equal (1, tableView.SelectedColumn);
    }

    [Fact]
    [SetupFakeDriver]
    public void TestColumnStyle_FirstColumnVisibleFalse_IsNotRendered ()
    {
        TableView tableView = GetABCDEFTableView (out DataTable dt);

        tableView.Style.ShowHorizontalScrollIndicators = true;
        tableView.Style.ShowHorizontalHeaderUnderline = true;
        tableView.Style.GetOrCreateColumnStyle (0).Visible = false;

        tableView.LayoutSubviews ();
        tableView.Draw ();

        var expected =
            @"
│B│C│D│
├─┼─┼─►
│2│3│4│";

        TestHelpers.AssertDriverContentsAre (expected, output);
    }

    [InlineData (true)]
    [InlineData (false)]
    [Theory]
    [SetupFakeDriver]
    public void TestColumnStyle_LastColumnVisibleFalse_CursorStaysAt2 (bool useEnd)
    {
        TableView tableView = GetABCDEFTableView (out DataTable dt);
        tableView.LayoutSubviews ();

        // select D 
        tableView.SelectedColumn = 3;
        Assert.Equal (3, tableView.SelectedColumn);

        tableView.Style.GetOrCreateColumnStyle (3).Visible = false;
        tableView.Style.GetOrCreateColumnStyle (4).Visible = false;
        tableView.Style.GetOrCreateColumnStyle (5).Visible = false;

        // column D is invisible so this method should move to 2 (C)
        tableView.EnsureValidSelection ();
        Assert.Equal (2, tableView.SelectedColumn);

        tableView.NewKeyDownEvent (
                                   new () { KeyCode = useEnd ? KeyCode.End : KeyCode.CursorRight }
                                  );

        // Expect the cursor to stay at 2
        Assert.Equal (2, tableView.SelectedColumn);
    }

    [Fact]
    [SetupFakeDriver]
    public void TestColumnStyle_PreceedingColumnsInvisible_NoScrollIndicator ()
    {
        TableView tableView = GetABCDEFTableView (out DataTable dt);

        tableView.Style.ShowHorizontalScrollIndicators = true;
        tableView.Style.ShowHorizontalHeaderUnderline = true;

        tableView.ColumnOffset = 1;
        tableView.LayoutSubviews ();
        tableView.Draw ();

        // normally we should have scroll indicators because A,E and F are of screen
        var expected =
            @"
│B│C│D│
◄─┼─┼─►
│2│3│4│";

        TestHelpers.AssertDriverContentsAre (expected, output);

        // but if E and F are invisible so we shouldn't show right
        tableView.Style.GetOrCreateColumnStyle (4).Visible = false;
        tableView.Style.GetOrCreateColumnStyle (5).Visible = false;

        expected =
            @"
│B│C│D│
◄─┼─┼─┤
│2│3│4│";
        tableView.Draw ();
        TestHelpers.AssertDriverContentsAre (expected, output);

        // now also A is invisible so we cannot scroll in either direction
        tableView.Style.GetOrCreateColumnStyle (0).Visible = false;

        expected =
            @"
│B│C│D│
├─┼─┼─┤
│2│3│4│";
        tableView.Draw ();
        TestHelpers.AssertDriverContentsAre (expected, output);
    }

    [Fact]
    [SetupFakeDriver]
    public void TestColumnStyle_RemainingColumnsInvisible_NoScrollIndicator ()
    {
        TableView tableView = GetABCDEFTableView (out DataTable dt);

        tableView.Style.ShowHorizontalScrollIndicators = true;
        tableView.Style.ShowHorizontalHeaderUnderline = true;
        tableView.LayoutSubviews ();
        tableView.Draw ();

        // normally we should have scroll indicators because DEF are of screen
        var expected =
            @"
│A│B│C│
├─┼─┼─►
│1│2│3│";

        TestHelpers.AssertDriverContentsAre (expected, output);

        // but if DEF are invisible we shouldn't be showing the indicator
        tableView.Style.GetOrCreateColumnStyle (3).Visible = false;
        tableView.Style.GetOrCreateColumnStyle (4).Visible = false;
        tableView.Style.GetOrCreateColumnStyle (5).Visible = false;

        expected =
            @"
│A│B│C│
├─┼─┼─┤
│1│2│3│";
        tableView.Draw ();
        TestHelpers.AssertDriverContentsAre (expected, output);
    }

    [Fact]
    [SetupFakeDriver]
    public void TestColumnStyle_VisibleFalse_CursorStepsOverInvisibleColumns ()
    {
        TableView tableView = GetABCDEFTableView (out DataTable dt);
        tableView.LayoutSubviews ();

        tableView.Style.GetOrCreateColumnStyle (1).Visible = false;
        tableView.SelectedColumn = 0;

        tableView.NewKeyDownEvent (new () { KeyCode = KeyCode.CursorRight });

        // Expect the cursor navigation to skip over the invisible column(s)
        Assert.Equal (2, tableView.SelectedColumn);

        tableView.NewKeyDownEvent (new () { KeyCode = KeyCode.CursorLeft });

        // Expect the cursor navigation backwards to skip over invisible column too
        Assert.Equal (0, tableView.SelectedColumn);
    }

    [Theory]
    [SetupFakeDriver]
    [InlineData (true, true)]
    [InlineData (false, true)]
    [InlineData (true, false)]
    [InlineData (false, false)]
    public void TestColumnStyle_VisibleFalse_DoesNotEffect_EnsureSelectedCellIsVisible (
        bool smooth,
        bool invisibleCol
    )
    {
        TableView tableView = GetABCDEFTableView (out DataTable dt);
        tableView.LayoutSubviews ();
        tableView.Style.SmoothHorizontalScrolling = smooth;

        if (invisibleCol)
        {
            tableView.Style.GetOrCreateColumnStyle (3).Visible = false;
        }

        // New TableView should have first cell selected 
        Assert.Equal (0, tableView.SelectedColumn);

        // With no scrolling
        Assert.Equal (0, tableView.ColumnOffset);

        // A,B and C are visible on screen at the moment so these should have no effect
        tableView.SelectedColumn = 1;
        tableView.EnsureSelectedCellIsVisible ();
        Assert.Equal (0, tableView.ColumnOffset);

        tableView.SelectedColumn = 2;
        tableView.EnsureSelectedCellIsVisible ();
        Assert.Equal (0, tableView.ColumnOffset);

        // Selecting D should move the visible table area to fit D onto the screen
        tableView.SelectedColumn = 3;
        tableView.EnsureSelectedCellIsVisible ();
        Assert.Equal (smooth ? 1 : 3, tableView.ColumnOffset);
    }

    [Fact]
    [SetupFakeDriver]
    public void TestColumnStyle_VisibleFalse_IsNotRendered ()
    {
        TableView tableView = GetABCDEFTableView (out _);

        tableView.Style.GetOrCreateColumnStyle (1).Visible = false;
        tableView.LayoutSubviews ();
        tableView.Draw ();

        var expected =
            @"
│A│C│D│
│1│3│4│";

        TestHelpers.AssertDriverContentsAre (expected, output);
    }

    [Fact]
    [SetupFakeDriver]
    public void TestColumnStyle_VisibleFalse_MultiSelected ()
    {
        TableView tableView = GetABCDEFTableView (out DataTable dt);
        tableView.LayoutSubviews ();

        // user has rectangular selection 
        tableView.MultiSelectedRegions.Push (
                                             new (
                                                  Point.Empty,
                                                  new (0, 0, 3, 1)
                                                 )
                                            );

        Assert.Equal (3, tableView.GetAllSelectedCells ().Count ());
        Assert.True (tableView.IsSelected (0, 0));
        Assert.True (tableView.IsSelected (1, 0));
        Assert.True (tableView.IsSelected (2, 0));
        Assert.False (tableView.IsSelected (3, 0));

        // if middle column is invisible
        tableView.Style.GetOrCreateColumnStyle (1).Visible = false;

        // it should not be included in the selection
        Assert.Equal (2, tableView.GetAllSelectedCells ().Count ());
        Assert.True (tableView.IsSelected (0, 0));
        Assert.False (tableView.IsSelected (1, 0));
        Assert.True (tableView.IsSelected (2, 0));
        Assert.False (tableView.IsSelected (3, 0));

        Assert.DoesNotContain (new (1, 0), tableView.GetAllSelectedCells ());
    }

    [Fact]
    [SetupFakeDriver]
    public void TestColumnStyle_VisibleFalse_MultiSelectingStepsOverInvisibleColumns ()
    {
        TableView tableView = GetABCDEFTableView (out _);
        tableView.LayoutSubviews ();

        // if middle column is invisible
        tableView.Style.GetOrCreateColumnStyle (1).Visible = false;

        tableView.NewKeyDownEvent (Key.CursorRight.WithShift);

        // Selection should extend from A to C but skip B
        Assert.Equal (2, tableView.GetAllSelectedCells ().Count ());
        Assert.True (tableView.IsSelected (0, 0));
        Assert.False (tableView.IsSelected (1, 0));
        Assert.True (tableView.IsSelected (2, 0));
        Assert.False (tableView.IsSelected (3, 0));

        Assert.DoesNotContain (new (1, 0), tableView.GetAllSelectedCells ());
    }

    [Fact]
    [SetupFakeDriver]
    public void TestControlClick_MultiSelect_ThreeRowTable_FullRowSelect ()
    {
        TableView tv = GetTwoRowSixColumnTable (out DataTable dt);
        dt.Rows.Add (1, 2, 3, 4, 5, 6);
        tv.LayoutSubviews ();

        tv.MultiSelect = true;

        // Clicking in bottom row
        tv.NewMouseEvent (
                          new () { Position = new (1, 4), Flags = MouseFlags.Button1Clicked }
                         );

        // should select that row
        Assert.Equal (2, tv.SelectedRow);

        // shift clicking top row
        tv.NewMouseEvent (
                          new () { Position = new (1, 2), Flags = MouseFlags.Button1Clicked | MouseFlags.ButtonCtrl }
                         );

        // should extend the selection
        // to include bottom and top row but not middle
        Assert.Equal (0, tv.SelectedRow);

        Point [] selected = tv.GetAllSelectedCells ().ToArray ();

        Assert.Contains (Point.Empty, selected);
        Assert.DoesNotContain (new (0, 1), selected);
        Assert.Contains (new (0, 2), selected);
    }

    [Fact]
    [SetupFakeDriver]
    public void TestEnumerableDataSource_BasicTypes ()
    {
        ((FakeDriver)Application.Driver!).SetBufferSize (100, 100);
        var tv = new TableView ();
        tv.ColorScheme = Colors.ColorSchemes ["TopLevel"];
        tv.Viewport = new (0, 0, 50, 6);

        tv.Table = new EnumerableTableSource<Type> (
                                                    new [] { typeof (string), typeof (int), typeof (float) },
                                                    new ()
                                                    {
                                                        { "Name", t => t.Name }, { "Namespace", t => t.Namespace },
                                                        { "BaseType", t => t.BaseType }
                                                    }
                                                   );

        tv.LayoutSubviews ();

        tv.Draw ();

        var expected =
            @"
┌──────┬─────────┬───────────────────────────────┐
│Name  │Namespace│BaseType                       │
├──────┼─────────┼───────────────────────────────┤
│String│System   │System.Object                  │
│Int32 │System   │System.ValueType               │
│Single│System   │System.ValueType               │";

        TestHelpers.AssertDriverContentsAre (expected, output);
    }

    [Fact]
    [SetupFakeDriver]
    public void TestFullRowSelect_AlwaysUseNormalColorForVerticalCellLines ()
    {
        TableView tv = GetTwoRowSixColumnTable (out DataTable dt);
        dt.Rows.Add (1, 2, 3, 4, 5, 6);

        tv.Viewport = new (0, 0, 7, 6);
        tv.Frame = new (0, 0, 7, 6);
        tv.LayoutSubviews ();

        tv.FullRowSelect = true;
        tv.Style.ShowHorizontalBottomline = true;
        tv.Style.AlwaysUseNormalColorForVerticalCellLines = true;

        // Clicking in bottom row
        tv.NewMouseEvent (
                          new () { Position = new (1, 4), Flags = MouseFlags.Button1Clicked }
                         );

        // should select that row
        Assert.Equal (2, tv.SelectedRow);

        tv.OnDrawContent (tv.Viewport);

        var expected =
            @"
│A│B│C│
├─┼─┼─►
│1│2│3│
│1│2│3│
│1│2│3│
└─┴─┴─┘";

        TestHelpers.AssertDriverContentsAre (expected, output);

        Attribute normal = tv.ColorScheme.Normal;
        tv.ColorScheme = new (tv.ColorScheme) { Focus = new (Color.Magenta, Color.White) };
        Attribute focus = tv.ColorScheme.Focus;

        tv.Draw ();

        // Focus color (1) should be used for cells only because
        // AlwaysUseNormalColorForVerticalCellLines is true
        expected =
            @"
0000000
0000000
0000000
0000000
0101010
0000000";

        TestHelpers.AssertDriverAttributesAre (expected, Application.Driver, normal, focus);
    }

    [Fact]
    [SetupFakeDriver]
    public void TestFullRowSelect_SelectionColorDoesNotStop_WhenShowVerticalCellLinesIsFalse ()
    {
        TableView tv = GetTwoRowSixColumnTable (out DataTable dt);
        dt.Rows.Add (1, 2, 3, 4, 5, 6);
        tv.LayoutSubviews ();

        tv.Viewport = new (0, 0, 7, 6);

        tv.FullRowSelect = true;
        tv.Style.ShowVerticalCellLines = false;
        tv.Style.ShowVerticalHeaderLines = false;

        // Clicking in bottom row
        tv.NewMouseEvent (
                          new () { Position = new (1, 4), Flags = MouseFlags.Button1Clicked }
                         );

        // should select that row
        Assert.Equal (2, tv.SelectedRow);

        tv.Draw ();

        var expected =
            @"
A B C
───────
1 2 3
1 2 3
1 2 3";

        TestHelpers.AssertDriverContentsAre (expected, output);

        Attribute normal = tv.ColorScheme.Normal;
        tv.ColorScheme = new (tv.ColorScheme) { Focus = new (Color.Magenta, Color.White) };
        Attribute focus = tv.ColorScheme.Focus;
        tv.Draw ();

        // Focus color (1) should be used for rendering the selected line
        // Note that because there are no vertical cell lines we use the focus
        // color for the whole row
        expected =
            @"
000000
000000
000000
000000
111111";

        TestHelpers.AssertDriverAttributesAre (expected, Application.Driver, normal, focus);
    }

    [Fact]
    [SetupFakeDriver]
    public void TestFullRowSelect_SelectionColorStopsAtTableEdge_WithCellLines ()
    {
        TableView tv = GetTwoRowSixColumnTable (out DataTable dt);
        dt.Rows.Add (1, 2, 3, 4, 5, 6);

        tv.Viewport = new (0, 0, 7, 6);
        tv.Frame = new (0, 0, 7, 6);
        tv.LayoutSubviews ();

        tv.FullRowSelect = true;
        tv.Style.ShowHorizontalBottomline = true;

        // Clicking in bottom row
        tv.NewMouseEvent (
                          new () { Position = new (1, 4), Flags = MouseFlags.Button1Clicked }
                         );

        // should select that row
        Assert.Equal (2, tv.SelectedRow);

        tv.OnDrawContent (tv.Viewport);

        var expected =
            @"
│A│B│C│
├─┼─┼─►
│1│2│3│
│1│2│3│
│1│2│3│
└─┴─┴─┘";

        TestHelpers.AssertDriverContentsAre (expected, output);

        Attribute normal = tv.ColorScheme.Normal;
        tv.ColorScheme = new (tv.ColorScheme) { Focus = new (Color.Magenta, Color.White) };
        Attribute focus = tv.ColorScheme.Focus;

        tv.Draw ();

        // Focus color (1) should be used for rendering the selected line
        // But should not spill into the borders.  Normal color (0) should be
        // used for the rest.
        expected =
            @"
0000000
0000000
0000000
0000000
0111110
0000000";

        TestHelpers.AssertDriverAttributesAre (expected, Application.Driver, normal, focus);
    }

    [Theory]
    [SetupFakeDriver]
    [InlineData (Orientation.Horizontal, false)]
    [InlineData (Orientation.Vertical, false)]
    [InlineData (Orientation.Horizontal, true)]
    [InlineData (Orientation.Vertical, true)]
    public void TestListTableSource (Orientation orient, bool parallel)
    {
        IList list = BuildList (16);

        var tv = new TableView ();

        //tv.BeginInit (); tv.EndInit ();
        tv.ColorScheme = Colors.ColorSchemes ["TopLevel"];
        tv.Viewport = new (0, 0, 25, 4);

        tv.Style = new ()
        {
            ShowHeaders = false, ShowHorizontalHeaderOverline = false, ShowHorizontalHeaderUnderline = false
        };
        var listStyle = new ListColumnStyle { Orientation = orient, ScrollParallel = parallel };

        tv.Table = new ListTableSource (list, tv, listStyle);

        tv.LayoutSubviews ();

        tv.Draw ();

        var horizPerpExpected =
            @"
│Item 0│Item 1          │
│Item 2│Item 3          │
│Item 4│Item 5          │
│Item 6│Item 7          │";

        var horizParaExpected =
            @"
│Item 0 │Item 1 │Item 2 │
│Item 4 │Item 5 │Item 6 │
│Item 8 │Item 9 │Item 10│
│Item 12│Item 13│Item 14│";

        var vertPerpExpected =
            @"
│Item 0│Item 4│Item 8   │
│Item 1│Item 5│Item 9   │
│Item 2│Item 6│Item 10  │
│Item 3│Item 7│Item 11  │";

        var vertParaExpected =
            @"
│Item 0│Item 8          │
│Item 1│Item 9          │
│Item 2│Item 10         │
│Item 3│Item 11         │";

        string expected;

        if (orient == Orientation.Vertical)
        {
            if (parallel)
            {
                expected = vertParaExpected;
            }
            else
            {
                expected = vertPerpExpected;
            }
        }
        else
        {
            if (parallel)
            {
                expected = horizParaExpected;
            }
            else
            {
                expected = horizPerpExpected;
            }
        }

        TestHelpers.AssertDriverContentsAre (expected, output);
    }

    [InlineData (true)]
    [InlineData (false)]
    [Theory]
    [SetupFakeDriver]
    public void TestMoveStartEnd_WithFullRowSelect (bool withFullRowSelect)
    {
        TableView tableView = GetTwoRowSixColumnTable ();
        tableView.LayoutSubviews ();
        tableView.FullRowSelect = withFullRowSelect;

        tableView.SelectedRow = 1;
        tableView.SelectedColumn = 1;

        tableView.NewKeyDownEvent (Key.Home.WithCtrl);

        if (withFullRowSelect)
        {
            // Should not be any horizontal movement when
            // using navigate to Start/End and FullRowSelect
            Assert.Equal (1, tableView.SelectedColumn);
            Assert.Equal (0, tableView.SelectedRow);
        }
        else
        {
            Assert.Equal (0, tableView.SelectedColumn);
            Assert.Equal (0, tableView.SelectedRow);
        }

        tableView.NewKeyDownEvent (
                                   new (
                                        KeyCode.End | KeyCode.CtrlMask
                                       )
                                  );

        if (withFullRowSelect)
        {
            Assert.Equal (1, tableView.SelectedColumn);
            Assert.Equal (1, tableView.SelectedRow);
        }
        else
        {
            Assert.Equal (5, tableView.SelectedColumn);
            Assert.Equal (1, tableView.SelectedRow);
        }
    }

    [Fact]
    [SetupFakeDriver]
    public void TestShiftClick_MultiSelect_TwoRowTable_FullRowSelect ()
    {
        TableView tv = GetTwoRowSixColumnTable ();
        tv.LayoutSubviews ();

        tv.MultiSelect = true;

        // Clicking in bottom row
        tv.NewMouseEvent (
                          new () { Position = new (1, 3), Flags = MouseFlags.Button1Clicked }
                         );

        // should select that row
        Assert.Equal (1, tv.SelectedRow);

        // shift clicking top row
        tv.NewMouseEvent (
                          new () { Position = new (1, 2), Flags = MouseFlags.Button1Clicked | MouseFlags.ButtonShift }
                         );

        // should extend the selection
        Assert.Equal (0, tv.SelectedRow);

        Point [] selected = tv.GetAllSelectedCells ().ToArray ();

        Assert.Contains (Point.Empty, selected);
        Assert.Contains (new (0, 1), selected);
    }

    [Fact]
    [SetupFakeDriver]
    public void TestTableViewCheckboxes_ByObject ()
    {
        TableView tv = GetPetTable (out EnumerableTableSource<PickablePet> source);
        tv.LayoutSubviews ();
        IReadOnlyCollection<PickablePet> pets = source.Data;

        CheckBoxTableSourceWrapperByObject<PickablePet> wrapper = new (
                                                                       tv,
                                                                       source,
                                                                       p => p.IsPicked,
                                                                       (p, b) => p.IsPicked = b
                                                                      );

        tv.Table = wrapper;

        tv.Draw ();

        var expected =
            @"
┌─┬───────┬─────────────┐
│ │Name   │Kind         │
├─┼───────┼─────────────┤
│☐│Tammy  │Cat          │
│☐│Tibbles│Cat          │
│☐│Ripper │Dog          │";

        TestHelpers.AssertDriverContentsAre (expected, output);

#pragma warning disable xUnit2029
        Assert.Empty (pets.Where (p => p.IsPicked));
#pragma warning restore xUnit2029

        tv.NewKeyDownEvent (Key.Space);

        Assert.True (pets.First ().IsPicked);

        tv.Draw ();

        expected =
            @"
┌─┬───────┬─────────────┐
│ │Name   │Kind         │
├─┼───────┼─────────────┤
│☑│Tammy  │Cat          │
│☐│Tibbles│Cat          │
│☐│Ripper │Dog          │";

        TestHelpers.AssertDriverContentsAre (expected, output);

        tv.NewKeyDownEvent (Key.CursorDown);
        tv.NewKeyDownEvent (Key.Space);

        Assert.True (pets.ElementAt (0).IsPicked);
        Assert.True (pets.ElementAt (1).IsPicked);
        Assert.False (pets.ElementAt (2).IsPicked);

        tv.Draw ();

        expected =
            @"
┌─┬───────┬─────────────┐
│ │Name   │Kind         │
├─┼───────┼─────────────┤
│☑│Tammy  │Cat          │
│☑│Tibbles│Cat          │
│☐│Ripper │Dog          │";

        TestHelpers.AssertDriverContentsAre (expected, output);

        tv.NewKeyDownEvent (Key.CursorUp);
        tv.NewKeyDownEvent (Key.Space);

        Assert.False (pets.ElementAt (0).IsPicked);
        Assert.True (pets.ElementAt (1).IsPicked);
        Assert.False (pets.ElementAt (2).IsPicked);

        tv.Draw ();

        expected =
            @"
┌─┬───────┬─────────────┐
│ │Name   │Kind         │
├─┼───────┼─────────────┤
│☐│Tammy  │Cat          │
│☑│Tibbles│Cat          │
│☐│Ripper │Dog          │";

        TestHelpers.AssertDriverContentsAre (expected, output);
    }

    [Fact]
    [SetupFakeDriver]
    public void TestTableViewCheckboxes_MultiSelectIsUnion_WhenToggling ()
    {
        TableView tv = GetTwoRowSixColumnTable (out DataTable dt);
        dt.Rows.Add (1, 2, 3, 4, 5, 6);
        tv.LayoutSubviews ();

        var wrapper = new CheckBoxTableSourceWrapperByIndex (tv, tv.Table);
        tv.Table = wrapper;
        wrapper.CheckedRows.Add (0);
        wrapper.CheckedRows.Add (2);

        tv.Draw ();

        var expected =
            @"
│ │A│B│
├─┼─┼─►
│☑│1│2│
│☐│1│2│
│☑│1│2│";

        //toggle top two at once
        tv.NewKeyDownEvent (Key.CursorDown.WithShift);
        Assert.True (tv.IsSelected (0, 0));
        Assert.True (tv.IsSelected (0, 1));
        tv.NewKeyDownEvent (Key.Space);

        // Because at least 1 of the rows is not yet ticked we toggle them all to ticked
        TestHelpers.AssertDriverContentsAre (expected, output);
        Assert.Contains (0, wrapper.CheckedRows);
        Assert.Contains (1, wrapper.CheckedRows);
        Assert.Contains (2, wrapper.CheckedRows);
        Assert.Equal (3, wrapper.CheckedRows.Count);

        tv.Draw ();

        expected =
            @"
│ │A│B│
├─┼─┼─►
│☑│1│2│
│☑│1│2│
│☑│1│2│";

        TestHelpers.AssertDriverContentsAre (expected, output);

        // Untoggle the top 2
        tv.NewKeyDownEvent (Key.Space);

        tv.Draw ();

        expected =
            @"
│ │A│B│
├─┼─┼─►
│☐│1│2│
│☐│1│2│
│☑│1│2│";
        TestHelpers.AssertDriverContentsAre (expected, output);
        Assert.Single (wrapper.CheckedRows, 2);
    }

    [Fact]
    [SetupFakeDriver]
    public void TestTableViewCheckboxes_SelectAllToggle ()
    {
        TableView tv = GetTwoRowSixColumnTable (out DataTable dt);
        dt.Rows.Add (1, 2, 3, 4, 5, 6);
        tv.LayoutSubviews ();

        var wrapper = new CheckBoxTableSourceWrapperByIndex (tv, tv.Table);
        tv.Table = wrapper;

        //toggle all cells
        tv.NewKeyDownEvent (Key.A.WithCtrl);
        tv.NewKeyDownEvent (Key.Space);

        tv.Draw ();

        var expected =
            @"
│ │A│B│
├─┼─┼─►
│☑│1│2│
│☑│1│2│
│☑│1│2│";

        TestHelpers.AssertDriverContentsAre (expected, output);
        Assert.Contains (0, wrapper.CheckedRows);
        Assert.Contains (1, wrapper.CheckedRows);
        Assert.Contains (2, wrapper.CheckedRows);
        Assert.Equal (3, wrapper.CheckedRows.Count);

        // Untoggle all again
        tv.NewKeyDownEvent (Key.Space);

        tv.Draw ();

        expected =
            @"
│ │A│B│
├─┼─┼─►
│☐│1│2│
│☐│1│2│
│☐│1│2│";

        TestHelpers.AssertDriverContentsAre (expected, output);

        Assert.Empty (wrapper.CheckedRows);
    }

    [Fact]
    [SetupFakeDriver]
    public void TestTableViewCheckboxes_SelectAllToggle_ByObject ()
    {
        TableView tv = GetPetTable (out EnumerableTableSource<PickablePet> source);
        tv.LayoutSubviews ();
        IReadOnlyCollection<PickablePet> pets = source.Data;

        CheckBoxTableSourceWrapperByObject<PickablePet> wrapper = new (
                                                                       tv,
                                                                       source,
                                                                       p => p.IsPicked,
                                                                       (p, b) => p.IsPicked = b
                                                                      );

        tv.Table = wrapper;

        Assert.DoesNotContain (pets, p => p.IsPicked);

        //toggle all cells
        tv.NewKeyDownEvent (Key.A.WithCtrl);
        tv.NewKeyDownEvent (Key.Space);

        Assert.True (pets.All (p => p.IsPicked));

        tv.Draw ();

        var expected =
            @"
┌─┬───────┬─────────────┐
│ │Name   │Kind         │
├─┼───────┼─────────────┤
│☑│Tammy  │Cat          │
│☑│Tibbles│Cat          │
│☑│Ripper │Dog          │";

        TestHelpers.AssertDriverContentsAre (expected, output);

        tv.NewKeyDownEvent (Key.Space);

#pragma warning disable xUnit2029
        Assert.Empty (pets.Where (p => p.IsPicked));
#pragma warning restore xUnit2029

        tv.Draw ();

        expected =
            @"
┌─┬───────┬─────────────┐
│ │Name   │Kind         │
├─┼───────┼─────────────┤
│☐│Tammy  │Cat          │
│☐│Tibbles│Cat          │
│☐│Ripper │Dog          │
";

        TestHelpers.AssertDriverContentsAre (expected, output);
    }

    [Fact]
    [SetupFakeDriver]
    public void TestTableViewCheckboxes_Simple ()
    {
        TableView tv = GetTwoRowSixColumnTable (out DataTable dt);
        dt.Rows.Add (1, 2, 3, 4, 5, 6);
        tv.LayoutSubviews ();

        var wrapper = new CheckBoxTableSourceWrapperByIndex (tv, tv.Table);
        tv.Table = wrapper;

        tv.Draw ();

        var expected =
            @"
│ │A│B│
├─┼─┼─►
│☐│1│2│
│☐│1│2│
│☐│1│2│";

        TestHelpers.AssertDriverContentsAre (expected, output);

        Assert.Empty (wrapper.CheckedRows);

        //toggle the top cell
        tv.NewKeyDownEvent (Key.Space);

        Assert.Single (wrapper.CheckedRows, 0);

        tv.Draw ();

        expected =
            @"
│ │A│B│
├─┼─┼─►
│☑│1│2│
│☐│1│2│
│☐│1│2│";

        TestHelpers.AssertDriverContentsAre (expected, output);

        tv.NewKeyDownEvent (Key.CursorDown);
        tv.NewKeyDownEvent (Key.Space);

        Assert.Contains (0, wrapper.CheckedRows);
        Assert.Contains (1, wrapper.CheckedRows);
        Assert.Equal (2, wrapper.CheckedRows.Count);

        tv.Draw ();

        expected =
            @"
│ │A│B│
├─┼─┼─►
│☑│1│2│
│☑│1│2│
│☐│1│2│";

        TestHelpers.AssertDriverContentsAre (expected, output);

        // untoggle top one
        tv.NewKeyDownEvent (Key.CursorUp);
        tv.NewKeyDownEvent (Key.Space);

        Assert.Single (wrapper.CheckedRows, 1);

        tv.Draw ();

        expected =
            @"
│ │A│B│
├─┼─┼─►
│☐│1│2│
│☑│1│2│
│☐│1│2│";

        TestHelpers.AssertDriverContentsAre (expected, output);
    }

    [Fact]
    [SetupFakeDriver]
    public void TestTableViewRadioBoxes_Simple_ByObject ()
    {
        TableView tv = GetPetTable (out EnumerableTableSource<PickablePet> source);
        tv.LayoutSubviews ();
        IReadOnlyCollection<PickablePet> pets = source.Data;

        CheckBoxTableSourceWrapperByObject<PickablePet> wrapper = new (
                                                                       tv,
                                                                       source,
                                                                       p => p.IsPicked,
                                                                       (p, b) => p.IsPicked = b
                                                                      );

        wrapper.UseRadioButtons = true;

        tv.Table = wrapper;
        tv.Draw ();

        var expected =
            @"
┌─┬───────┬─────────────┐
│ │Name   │Kind         │
├─┼───────┼─────────────┤
│○│Tammy  │Cat          │
│○│Tibbles│Cat          │
│○│Ripper │Dog          │
";

        TestHelpers.AssertDriverContentsAre (expected, output);

#pragma warning disable xUnit2029
        Assert.Empty (pets.Where (p => p.IsPicked));
#pragma warning restore xUnit2029

        tv.NewKeyDownEvent (Key.Space);

        Assert.True (pets.First ().IsPicked);

        tv.Draw ();

        expected =
            @"
┌─┬───────┬─────────────┐
│ │Name   │Kind         │
├─┼───────┼─────────────┤
│◉│Tammy  │Cat          │
│○│Tibbles│Cat          │
│○│Ripper │Dog          │";

        TestHelpers.AssertDriverContentsAre (expected, output);

        tv.NewKeyDownEvent (Key.CursorDown);
        tv.NewKeyDownEvent (Key.Space);

        Assert.False (pets.ElementAt (0).IsPicked);
        Assert.True (pets.ElementAt (1).IsPicked);
        Assert.False (pets.ElementAt (2).IsPicked);

        tv.Draw ();

        expected =
            @"
┌─┬───────┬─────────────┐
│ │Name   │Kind         │
├─┼───────┼─────────────┤
│○│Tammy  │Cat          │
│◉│Tibbles│Cat          │
│○│Ripper │Dog          │";

        TestHelpers.AssertDriverContentsAre (expected, output);

        tv.NewKeyDownEvent (Key.CursorUp);
        tv.NewKeyDownEvent (Key.Space);

        Assert.True (pets.ElementAt (0).IsPicked);
        Assert.False (pets.ElementAt (1).IsPicked);
        Assert.False (pets.ElementAt (2).IsPicked);

        tv.Draw ();

        expected =
            @"
┌─┬───────┬─────────────┐
│ │Name   │Kind         │
├─┼───────┼─────────────┤
│◉│Tammy  │Cat          │
│○│Tibbles│Cat          │
│○│Ripper │Dog          │";

        TestHelpers.AssertDriverContentsAre (expected, output);
    }

    [Fact]
    public void TestToggleCells_MultiSelectOn ()
    {
        // 2 row table
        TableView tableView = GetABCDEFTableView (out DataTable dt);
        tableView.LayoutSubviews ();
        dt.Rows.Add (1, 2, 3, 4, 5, 6);

        tableView.MultiSelect = true;
        tableView.KeyBindings.ReplaceCommands (Key.Space, Command.Select);

        Point selectedCell = tableView.GetAllSelectedCells ().Single ();
        Assert.Equal (0, selectedCell.X);
        Assert.Equal (0, selectedCell.Y);

        // Go Right
        tableView.NewKeyDownEvent (Key.CursorRight);

        selectedCell = tableView.GetAllSelectedCells ().Single ();
        Assert.Equal (1, selectedCell.X);
        Assert.Equal (0, selectedCell.Y);

        // Toggle Select
        tableView.NewKeyDownEvent (Key.Space);
        TableSelection m = tableView.MultiSelectedRegions.Single ();
        Assert.True (m.IsToggled);
        Assert.Equal (1, m.Origin.X);
        Assert.Equal (0, m.Origin.Y);
        selectedCell = tableView.GetAllSelectedCells ().Single ();
        Assert.Equal (1, selectedCell.X);
        Assert.Equal (0, selectedCell.Y);

        // Go Left
        tableView.NewKeyDownEvent (Key.CursorLeft);

        // Both Toggled and Moved to should be selected
        Assert.Equal (2, tableView.GetAllSelectedCells ().Count ());
        Point s1 = tableView.GetAllSelectedCells ().ElementAt (0);
        Point s2 = tableView.GetAllSelectedCells ().ElementAt (1);
        Assert.Equal (1, s1.X);
        Assert.Equal (0, s1.Y);
        Assert.Equal (0, s2.X);
        Assert.Equal (0, s2.Y);

        // Go Down
        tableView.NewKeyDownEvent (Key.CursorDown);

        // Both Toggled and Moved to should be selected but not 0,0
        // which we moved down from
        Assert.Equal (2, tableView.GetAllSelectedCells ().Count ());
        s1 = tableView.GetAllSelectedCells ().ElementAt (0);
        s2 = tableView.GetAllSelectedCells ().ElementAt (1);
        Assert.Equal (1, s1.X);
        Assert.Equal (0, s1.Y);
        Assert.Equal (0, s2.X);
        Assert.Equal (1, s2.Y);

        // Go back to the toggled cell
        tableView.NewKeyDownEvent (new () { KeyCode = KeyCode.CursorRight });
        tableView.NewKeyDownEvent (new () { KeyCode = KeyCode.CursorUp });

        // Toggle off 
        tableView.NewKeyDownEvent (new () { KeyCode = KeyCode.Space });

        // Go Left
        tableView.NewKeyDownEvent (new () { KeyCode = KeyCode.CursorLeft });

        selectedCell = tableView.GetAllSelectedCells ().Single ();
        Assert.Equal (0, selectedCell.X);
        Assert.Equal (0, selectedCell.Y);
    }

    [Fact]
    public void TestToggleCells_MultiSelectOn_FullRowSelect ()
    {
        // 2 row table
        TableView tableView = GetABCDEFTableView (out DataTable dt);
        tableView.LayoutSubviews ();
        dt.Rows.Add (1, 2, 3, 4, 5, 6);
        tableView.FullRowSelect = true;
        tableView.MultiSelect = true;
        tableView.KeyBindings.ReplaceCommands (Key.Space, Command.Select);

        // Toggle Select Cell 0,0
        tableView.NewKeyDownEvent (new () { KeyCode = KeyCode.Space });

        // Go Down
        tableView.NewKeyDownEvent (new () { KeyCode = KeyCode.CursorDown });

        TableSelection m = tableView.MultiSelectedRegions.Single ();
        Assert.True (m.IsToggled);
        Assert.Equal (0, m.Origin.X);
        Assert.Equal (0, m.Origin.Y);

        //First row toggled and Second row active = 12 selected cells
        Assert.Equal (12, tableView.GetAllSelectedCells ().Count ());

        tableView.NewKeyDownEvent (new () { KeyCode = KeyCode.CursorRight });
        tableView.NewKeyDownEvent (new () { KeyCode = KeyCode.CursorUp });

        Assert.Single (tableView.MultiSelectedRegions.Where (r => r.IsToggled));

        // Can untoggle at 1,0 even though 0,0 was initial toggle because FullRowSelect is on
        tableView.NewKeyDownEvent (new () { KeyCode = KeyCode.Space });

#pragma warning disable xUnit2029
        Assert.Empty (tableView.MultiSelectedRegions.Where (r => r.IsToggled));
#pragma warning restore xUnit2029
    }

    [Fact]
    public void TestToggleCells_MultiSelectOn_SquareSelectToggled ()
    {
        // 3 row table
        TableView tableView = GetABCDEFTableView (out DataTable dt);
        tableView.LayoutSubviews ();
        dt.Rows.Add (1, 2, 3, 4, 5, 6);
        dt.Rows.Add (1, 2, 3, 4, 5, 6);
        tableView.MultiSelect = true;
        tableView.KeyBindings.ReplaceCommands (Key.Space, Command.Select);

        // Make a square selection
        tableView.NewKeyDownEvent (new () { KeyCode = KeyCode.ShiftMask | KeyCode.CursorDown });
        tableView.NewKeyDownEvent (new () { KeyCode = KeyCode.ShiftMask | KeyCode.CursorRight });

        Assert.Equal (4, tableView.GetAllSelectedCells ().Count ());

        // Toggle the square selected region on
        tableView.NewKeyDownEvent (new () { KeyCode = KeyCode.Space });

        // Go Right
        tableView.NewKeyDownEvent (new () { KeyCode = KeyCode.CursorRight });

        //Toggled on square + the active cell (x=2,y=1)
        Assert.Equal (5, tableView.GetAllSelectedCells ().Count ());
        Assert.Equal (2, tableView.SelectedColumn);
        Assert.Equal (1, tableView.SelectedRow);

        // Untoggle the rectangular region by hitting toggle in
        // any cell in that rect
        tableView.NewKeyDownEvent (new () { KeyCode = KeyCode.CursorUp });
        tableView.NewKeyDownEvent (new () { KeyCode = KeyCode.CursorLeft });

        Assert.Equal (4, tableView.GetAllSelectedCells ().Count ());
        tableView.NewKeyDownEvent (new () { KeyCode = KeyCode.Space });
        Assert.Single (tableView.GetAllSelectedCells ());
    }

    [Fact]
    public void TestToggleCells_MultiSelectOn_Two_SquareSelects_BothToggled ()
    {
        // 6 row table
        TableView tableView = GetABCDEFTableView (out DataTable dt);
        tableView.LayoutSubviews ();
        dt.Rows.Add (1, 2, 3, 4, 5, 6);
        dt.Rows.Add (1, 2, 3, 4, 5, 6);
        dt.Rows.Add (1, 2, 3, 4, 5, 6);
        dt.Rows.Add (1, 2, 3, 4, 5, 6);
        dt.Rows.Add (1, 2, 3, 4, 5, 6);
        tableView.MultiSelect = true;
        tableView.KeyBindings.ReplaceCommands (Key.Space, Command.Select);

        // Make first square selection (0,0 to 1,1)
        tableView.NewKeyDownEvent (new () { KeyCode = KeyCode.ShiftMask | KeyCode.CursorDown });
        tableView.NewKeyDownEvent (new () { KeyCode = KeyCode.ShiftMask | KeyCode.CursorRight });
        tableView.NewKeyDownEvent (new () { KeyCode = KeyCode.Space });
        Assert.Equal (4, tableView.GetAllSelectedCells ().Count ());

        // Make second square selection leaving 1 unselected line between them
        tableView.NewKeyDownEvent (new () { KeyCode = KeyCode.CursorLeft });
        tableView.NewKeyDownEvent (new () { KeyCode = KeyCode.CursorDown });
        tableView.NewKeyDownEvent (new () { KeyCode = KeyCode.CursorDown });
        tableView.NewKeyDownEvent (new () { KeyCode = KeyCode.ShiftMask | KeyCode.CursorDown });
        tableView.NewKeyDownEvent (new () { KeyCode = KeyCode.ShiftMask | KeyCode.CursorRight });

        // 2 square selections
        Assert.Equal (8, tableView.GetAllSelectedCells ().Count ());
    }

    private TableView GetABCDEFTableView (out DataTable dt)
    {
        var tableView = new TableView ();
        tableView.BeginInit ();
        tableView.EndInit ();

        tableView.ColorScheme = Colors.ColorSchemes ["TopLevel"];

        // 3 columns are visible
        tableView.Viewport = new (0, 0, 7, 5);
        tableView.Style.ShowHorizontalHeaderUnderline = false;
        tableView.Style.ShowHorizontalHeaderOverline = false;
        tableView.Style.AlwaysShowHeaders = true;
        tableView.Style.SmoothHorizontalScrolling = false;

        dt = new ();
        dt.Columns.Add ("A");
        dt.Columns.Add ("B");
        dt.Columns.Add ("C");
        dt.Columns.Add ("D");
        dt.Columns.Add ("E");
        dt.Columns.Add ("F");

        dt.Rows.Add (1, 2, 3, 4, 5, 6);
        tableView.Table = new DataTableSource (dt);

        return tableView;
    }

    private TableView GetPetTable (out EnumerableTableSource<PickablePet> source)
    {
        var tv = new TableView ();
        tv.ColorScheme = Colors.ColorSchemes ["TopLevel"];
        tv.Viewport = new (0, 0, 25, 6);

        List<PickablePet> pets = new ()
        {
            new (false, "Tammy", "Cat"),
            new (false, "Tibbles", "Cat"),
            new (false, "Ripper", "Dog")
        };

        tv.Table = source = new (
                                 pets,
                                 new ()
                                 {
                                     { "Name", p => p.Name }, { "Kind", p => p.Kind }
                                 }
                                );

        tv.LayoutSubviews ();

        return tv;
    }

    private TableView GetTwoRowSixColumnTable () { return GetTwoRowSixColumnTable (out _); }

    private TableView GetTwoRowSixColumnTable (out DataTable dt)
    {
        var tableView = new TableView ();
        tableView.ColorScheme = Colors.ColorSchemes ["TopLevel"];

        // 3 columns are visible
        tableView.Viewport = new (0, 0, 7, 5);
        tableView.Style.ShowHorizontalHeaderUnderline = true;
        tableView.Style.ShowHorizontalHeaderOverline = false;
        tableView.Style.AlwaysShowHeaders = true;
        tableView.Style.SmoothHorizontalScrolling = true;

        dt = new ();
        dt.Columns.Add ("A");
        dt.Columns.Add ("B");
        dt.Columns.Add ("C");
        dt.Columns.Add ("D");
        dt.Columns.Add ("E");
        dt.Columns.Add ("F");

        dt.Rows.Add (1, 2, 3, 4, 5, 6);
        dt.Rows.Add (1, 2, 3, 4, 5, 6);

        tableView.Table = new DataTableSource (dt);

        return tableView;
    }

    private TableView SetUpMiniTable () { return SetUpMiniTable (out _); }

    private TableView SetUpMiniTable (out DataTable dt)
    {
        var tv = new TableView ();
        tv.BeginInit ();
        tv.EndInit ();
        tv.Viewport = new (0, 0, 10, 4);

        dt = new ();
        dt.Columns.Add ("A");
        dt.Columns.Add ("B");
        dt.Rows.Add (1, 2);

        tv.Table = new DataTableSource (dt);
        tv.Style.GetOrCreateColumnStyle (0).MinWidth = 1;
        tv.Style.GetOrCreateColumnStyle (0).MinWidth = 1;
        tv.Style.GetOrCreateColumnStyle (1).MaxWidth = 1;
        tv.Style.GetOrCreateColumnStyle (1).MaxWidth = 1;

        tv.ColorScheme = Colors.ColorSchemes ["Base"];

        return tv;
    }

    private class PickablePet
    {
        public PickablePet (bool isPicked, string name, string kind)
        {
            IsPicked = isPicked;
            Name = name;
            Kind = kind;
        }

        public bool IsPicked { get; set; }
        public string Kind { get; }
        public string Name { get; }
    }
}