ILSpy/ILSpy/ViewModels/MetadataTablePageModel.cs

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using System;
using System.Collections.Generic;

using Avalonia.Controls;

using CommunityToolkit.Mvvm.ComponentModel;

namespace ILSpy.ViewModels
{
	/// <summary>
	/// Tab content for a metadata-table view: an item list bound to a DataGrid plus the
	/// column descriptors the view rebinds on every <c>DataContext</c> change. The DataGrid's
	/// <c>Columns</c> collection isn't an Avalonia property, so the model can't bind it
	/// declaratively — the view assigns it imperatively from <see cref="Columns"/>.
	/// </summary>
	public sealed partial class MetadataTablePageModel : TabPageModel
	{
		[ObservableProperty]
		private IReadOnlyList<object> items = Array.Empty<object>();

		[ObservableProperty]
		private IReadOnlyList<DataGridColumn> columns = Array.Empty<DataGridColumn>();

		/// <summary>
		/// When set, the view scrolls the grid so the row at this 0-based index is visible
		/// (Phase 3 token navigation). Cleared back to <see langword="null"/> after the view
		/// honours it so back-navigation can re-trigger the same scroll.
		/// </summary>
		[ObservableProperty]
		private int? scrollToRow;

		/// <summary>
		/// Raised when the user clicks a hyperlink-styled token cell. The host (the dock
		/// workspace) resolves the (row, columnName) pair to a metadata token and navigates
		/// to the target table row.
		/// </summary>
		public event Action<MetadataCellNavigationEventArgs>? NavigateToCellRequested;

		internal void RaiseNavigateToCell(object row, string columnName)
			=> NavigateToCellRequested?.Invoke(new MetadataCellNavigationEventArgs(row, columnName));
	}

	/// <summary>The (row, column) pair clicked in a token cell.</summary>
	public sealed record MetadataCellNavigationEventArgs(object Row, string ColumnName);
}