ILSpy/ILSpy/Docking/DockWorkspace.cs

// Copyright (c) 2026 AlphaSierraPapa for the SharpDevelop Team
//
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// substantial portions of the Software.
//
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// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Composition;

using Dock.Model.Controls;
using Dock.Model.Core;
using Dock.Model.Core.Events;

using ILSpy.Analyzers;
using ILSpy.AssemblyTree;
using ILSpy.Languages;
using ILSpy.Search;
using ILSpy.TextView;
using ILSpy.TreeNodes;
using ILSpy.ViewModels;

namespace ILSpy.Docking
{
	[Export]
	[Shared]
	public class DockWorkspace
	{
		readonly ILSpyDockFactory factory;
		readonly AssemblyTreeModel assemblyTreeModel;
		readonly LanguageService languageService;

		public IFactory Factory => factory;

		public IRootDock Layout { get; }

		public IReadOnlyList<ToolPaneMenuItem> ToolPaneMenuItems { get; }

		[ImportingConstructor]
		public DockWorkspace(
			AssemblyTreeModel assemblyTreeModel,
			SearchPaneModel searchPaneModel,
			AnalyzerTreeViewModel analyzerTreeViewModel,
			LanguageService languageService)
		{
			this.assemblyTreeModel = assemblyTreeModel;
			this.languageService = languageService;
			factory = new ILSpyDockFactory(assemblyTreeModel, searchPaneModel, analyzerTreeViewModel);
			Layout = factory.CreateLayout();
			if (factory.InitialDecompilerTab is { } initialTab)
				initialTab.Language = languageService.CurrentLanguage;

			assemblyTreeModel.PropertyChanged += OnAssemblyTreePropertyChanged;
			languageService.PropertyChanged += OnLanguagePropertyChanged;
			// Layout/factory initialization (locators, parent/factory wiring) is done by
			// the DockControl in MainWindow.axaml via InitializeFactory/InitializeLayout.

			ToolPaneMenuItems = new List<ToolPaneMenuItem> {
				new(assemblyTreeModel, factory),
				new(searchPaneModel, factory),
				new(analyzerTreeViewModel, factory),
			};

			factory.DockableAdded += OnDocumentMembershipChanged;
			factory.DockableRemoved += OnDocumentMembershipChanged;
			factory.DockableClosed += OnDocumentMembershipChanged;
			factory.DockableClosing += OnDockableClosing;

			// TODO: layout persistence (load on startup, save on exit). DockSerializer.SystemTextJson
			// trips System.Text.Json's MaxDepth=64 limit on our layout because Dock's JsonConverterList<T>
			// calls JsonSerializer.Serialize per list element, which doesn't preserve the writer's
			// reference-tracking state between calls — so Owner/Factory back-refs aren't deduplicated as
			// $ref. Options when revisiting: try Dock.Serializer.Newtonsoft (better cycle handling),
			// or build a custom JsonSerializerOptions with MaxDepth raised + replicate Dock's internal
			// polymorphic resolver.
		}

		void OnDocumentMembershipChanged(object? sender, EventArgs e) => UpdateLastDocumentCanClose();

		// Convert a tool pane's "close" (X button) into "hide" so the Window menu can restore it.
		// Documents are still closed for real — they get garbage-collected.
		void OnDockableClosing(object? sender, DockableClosingEventArgs e)
		{
			if (e.Dockable is ToolPaneModel toolPane)
			{
				e.Cancel = true;
				factory.HideDockable(toolPane);
			}
		}

		// When only one document is open, make it un-closeable so the user can't end up with an
		// empty document area.
		void UpdateLastDocumentCanClose()
		{
			var docs = factory.Documents?.VisibleDockables;
			if (docs == null)
				return;
			bool canClose = docs.Count > 1;
			foreach (var d in docs)
			{
				d.CanClose = canClose;
			}
		}

		void OnAssemblyTreePropertyChanged(object? sender, PropertyChangedEventArgs e)
		{
			if (e.PropertyName == nameof(AssemblyTreeModel.SelectedItem))
				ShowSelectedNode();
		}

		void OnLanguagePropertyChanged(object? sender, PropertyChangedEventArgs e)
		{
			if (e.PropertyName == nameof(LanguageService.CurrentLanguage))
			{
				if (GetActiveDecompilerTab() is { } tab)
				{
					tab.Language = languageService.CurrentLanguage;
					// Re-decompile by re-assigning the same node so the tab refreshes for the new language.
					var node = tab.CurrentNode;
					tab.CurrentNode = null;
					tab.CurrentNode = node;
				}
			}
		}

		void ShowSelectedNode()
		{
			if (assemblyTreeModel.SelectedItem is not ILSpyTreeNode node)
				return;
			var tab = GetActiveDecompilerTab();
			if (tab == null)
			{
				tab = factory.InitialDecompilerTab;
				if (tab == null || factory.Documents == null)
					return;
				factory.AddDockable(factory.Documents, tab);
				factory.SetActiveDockable(tab);
				factory.SetFocusedDockable(factory.Documents, tab);
			}
			tab.Language = languageService.CurrentLanguage;
			tab.CurrentNode = node;
		}

		DecompilerTabPageModel? GetActiveDecompilerTab()
		{
			if (factory.Documents?.ActiveDockable is DecompilerTabPageModel active)
				return active;
			if (factory.Documents?.VisibleDockables != null)
			{
				foreach (var d in factory.Documents.VisibleDockables)
					if (d is DecompilerTabPageModel m)
						return m;
			}
			return null;
		}

		public TabPageModel OpenNewTab(TabPageModel tab)
		{
			if (factory.Documents != null)
			{
				factory.AddDockable(factory.Documents, tab);
				factory.SetActiveDockable(tab);
				factory.SetFocusedDockable(factory.Documents, tab);
			}
			return tab;
		}
	}
}