radzen-blazor/Radzen.Blazor/Spreadsheet/Tools/RadzenSpreadsheetTableDesignToolset.razor

@namespace Radzen.Blazor
@using Radzen.Blazor
@using Radzen.Blazor.Spreadsheet
@using Radzen.Documents.Spreadsheet
@implements IDisposable

<RadzenTabsItem Text=@(Spreadsheet?.Localize(nameof(RadzenStrings.Spreadsheet_TableDesignTab)) ?? "Table Design") Visible=@IsActive>
    <TableDesignPanel Worksheet=@Worksheet />
</RadzenTabsItem>

@code {
#nullable enable

    [CascadingParameter]
    public Worksheet? Worksheet { get; set; }

    [CascadingParameter]
    public ISpreadsheet? Spreadsheet { get; set; }

    private readonly EventBinding<Worksheet> worksheetBinding;

    public RadzenSpreadsheetTableDesignToolset()
    {
        worksheetBinding = new EventBinding<Worksheet>(
            w =>
            {
                w.Selection.Changed += OnSelectionChanged;
                w.ChromeChanged += OnSelectionChanged;
            },
            w =>
            {
                w.Selection.Changed -= OnSelectionChanged;
                w.ChromeChanged -= OnSelectionChanged;
            });
    }

    private bool IsActive
    {
        get
        {
            if (Worksheet is null)
            {
                return false;
            }

            var sel = Worksheet.Selection.Cell;
            if (sel == CellRef.Invalid)
            {
                return false;
            }

            foreach (var t in Worksheet.Tables)
            {
                if (t.Range.Contains(sel.Row, sel.Column))
                {
                    return true;
                }
            }
            return false;
        }
    }

    protected override void OnParametersSet()
    {
        worksheetBinding.Bind(Worksheet);
    }

    // RadzenTabsItem.Visible is captured at parameter-set time, so we need an explicit
    // StateHasChanged() each time selection moves into or out of a table.
    private void OnSelectionChanged() => StateHasChanged();

    public void Dispose()
    {
        worksheetBinding.Dispose();
    }
}