ILSpy/ILSpy/Commands/CopyFullyQualifiedNameContextMenuEntry.cs

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using System.Composition;

using Avalonia;
using Avalonia.Controls;
using Avalonia.Input.Platform;

using ICSharpCode.ILSpy.Properties;

using ILSpy.TreeNodes;

namespace ILSpy.Commands
{
	/// <summary>
	/// Right-click → "Copy fully qualified name". Visible whenever the selection is exactly
	/// one tree node that wraps a TypeSystem entity (Type/Method/Field/Property/Event).
	/// Copies the entity's <see cref="ICSharpCode.Decompiler.TypeSystem.IEntity.ReflectionName"/>
	/// — the language-independent identifier used by FindNodeByPath etc. — to the clipboard.
	/// </summary>
	[ExportContextMenuEntry(Header = nameof(Resources.CopyName), Order = 9999)]
	[Shared]
	public sealed class CopyFullyQualifiedNameContextMenuEntry : IContextMenuEntry
	{
		public bool IsVisible(TextViewContext context) => GetMemberNodeFromContext(context) != null;

		public bool IsEnabled(TextViewContext context) => true;

		public void Execute(TextViewContext context)
		{
			var text = GetTextToCopy(context);
			if (text == null)
				return;
			// The clipboard is owned by the TopLevel that hosts the source visual; for the
			// assembly tree that's the main window. SetTextAsync runs on the UI thread and we
			// don't await — the menu item already returned by then.
			var topLevel = context.OriginalSource is Visual src ? TopLevel.GetTopLevel(src)
				: context.TreeGrid is { } grid ? TopLevel.GetTopLevel(grid)
				: null;
			topLevel?.Clipboard?.SetTextAsync(text);
		}

		/// <summary>Public for testing: returns the text the entry would write to the clipboard
		/// for the given context, or <see langword="null"/> when the entry isn't applicable.</summary>
		public string? GetTextToCopy(TextViewContext context)
			=> GetMemberNodeFromContext(context)?.Member?.ReflectionName;

		static IMemberTreeNode? GetMemberNodeFromContext(TextViewContext context)
			=> context.SelectedTreeNodes is { Length: 1 } nodes
				? nodes[0] as IMemberTreeNode
				: null;
	}
}