ILSpy/ILSpy/Commands/ShowOptionsCommand.cs

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using System.Collections.Generic;
using System.Composition;

using ICSharpCode.ILSpy.Properties;

using ILSpy.Docking;
using ILSpy.Options;
using ILSpy.ViewModels;

namespace ILSpy.Commands
{
	/// <summary>
	/// Opens (or focuses, if already open) the Options document tab. Mounted under the View
	/// menu mirroring the WPF host's `ShowOptionsCommand`. Ensures a single open instance —
	/// re-invocation just reactivates the existing tab.
	/// </summary>
	[ExportMainMenuCommand(ParentMenuID = nameof(Resources._View), Header = nameof(Resources._Options), MenuCategory = nameof(Resources.Options), MenuOrder = 999)]
	[Shared]
	[method: ImportingConstructor]
	internal sealed class ShowOptionsCommand(
		DockWorkspace dockWorkspace,
		SettingsService settingsService,
		// "OptionPages" is the named MEF contract every ExportOptionPageAttribute publishes
		// under (see ExportOptionPageAttribute ctor). [ImportMany] alone resolves to the
		// default contract for IOptionPage and would come up empty.
		[ImportMany("OptionPages")] IEnumerable<ExportFactory<IOptionPage, IOptionsMetadata>> optionPages) : SimpleCommand
	{
		public override void Execute(object? parameter)
		{
			// Singleton: one retained Options tab for the session. Reopening after close reuses
			// the same ContentTabPage (and its OptionsPageModel, so the selected page survives).
			dockWorkspace.OpenSingletonTab("options",
				() => dockWorkspace.OpenNewTab(new OptionsPageModel(settingsService, optionPages)));
		}
	}
}