Make the main menu extensible using MEF.

ILSpy/AboutPage.cs

@@ -3,6 +3,7 @@
 
 using System;
 using System.ComponentModel;
+using System.ComponentModel.Composition;
 using System.Diagnostics;
 using System.IO;
 using System.Linq;
@@ -14,13 +15,23 @@ using System.Windows.Data;
 using System.Windows.Input;
 using System.Xml;
 using System.Xml.Linq;
+
 using ICSharpCode.Decompiler;
 using ICSharpCode.ILSpy.TextView;
 
 namespace ICSharpCode.ILSpy
 {
-	static class AboutPage
+	[ExportMainMenuCommand(Menu = "_Help", Header = "_About", Order = 99999)]
+	sealed class AboutPage : SimpleCommand
 	{
+		[Import]
+		DecompilerTextView decompilerTextView = null;
+		
+		public override void Execute(object parameter)
+		{
+			Display(decompilerTextView);
+		}
+		
 		static readonly Uri UpdateUrl = new Uri("http://www.ilspy.net/updates.xml");
 		
 		static AvailableVersionInfo latestAvailableVersion;

ILSpy/Commands.cs

@@ -6,6 +6,15 @@ using System.Windows.Input;
 
 namespace ICSharpCode.ILSpy
 {
+	[ExportMainMenuCommand(Menu = "_File", Header = "E_xit", Order = 99999, Category = "Exit")]
+	sealed class ExitCommand : SimpleCommand
+	{
+		public override void Execute(object parameter)
+		{
+			MainWindow.Instance.Close();
+		}
+	}
+	
 	[ExportToolbarCommand(ToolTip = "Back", Icon = "Images/Back.png", Category = "Navigation")]
 	sealed class BrowseBackCommand : CommandWrapper {
 		public BrowseBackCommand() : base(NavigationCommands.BrowseBack) {}
@@ -50,4 +59,19 @@ namespace ICSharpCode.ILSpy
 			return wrappedCommand.CanExecute(parameter);
 		}
 	}
+	
+	public abstract class SimpleCommand : ICommand
+	{
+		public event EventHandler CanExecuteChanged {
+			add { CommandManager.RequerySuggested += value; }
+			remove { CommandManager.RequerySuggested -= value; }
+		}
+		
+		public abstract void Execute(object parameter);
+		
+		public virtual bool CanExecute(object parameter)
+		{
+			return true;
+		}
+	}
 }

ILSpy/ExportCommandAttribute.cs

@@ -22,7 +22,7 @@ namespace ICSharpCode.ILSpy
 	public class ExportToolbarCommandAttribute : ExportAttribute
 	{
 		public ExportToolbarCommandAttribute()
-			: base(typeof(ICommand))
+			: base("ToolbarCommand", typeof(ICommand))
 		{
 		}
 		
@@ -32,4 +32,32 @@ namespace ICSharpCode.ILSpy
 		public double Order { get; set; }
 	}
 	#endregion
+	
+	#region Main Menu
+	public interface IMainMenuCommandMetadata
+	{
+		string Icon { get; }
+		string Header { get; }
+		string Menu { get; }
+		string Category { get; }
+		
+		double Order { get; }
+	}
+	
+	[MetadataAttribute]
+	[AttributeUsage(AttributeTargets.Class, AllowMultiple=false)]
+	public class ExportMainMenuCommandAttribute : ExportAttribute
+	{
+		public ExportMainMenuCommandAttribute()
+			: base("MainMenuCommand", typeof(ICommand))
+		{
+		}
+		
+		public string Icon { get; set; }
+		public string Header { get; set; }
+		public string Menu { get; set; }
+		public string Category { get; set; }
+		public double Order { get; set; }
+	}
+	#endregion
 }

ILSpy/MainWindow.xaml

@@ -33,7 +33,7 @@
 	</Window.CommandBindings>
 	<DockPanel>
 		<!-- Main menu -->
-		<Menu DockPanel.Dock="Top">
+		<Menu DockPanel.Dock="Top" Name="mainMenu">
 			<MenuItem Header="_File">
 				<MenuItem Command="Open">
 					<MenuItem.Icon>
@@ -52,8 +52,6 @@
 						<Image Width="16" Height="16" Source="Images/SaveFile.png" />
 					</MenuItem.Icon>
 				</MenuItem>
-				<Separator />
-				<MenuItem Header="E_xit" Click="ExitClick" />
 			</MenuItem>
 			<MenuItem Header="_View">
 				<MenuItem Header="Show _internal types and members" IsCheckable="True" IsChecked="{Binding FilterSettings.ShowInternalApi}">
@@ -63,9 +61,6 @@
 				</MenuItem>
 				<MenuItem Header="Show _analyzer" Name="showAnalyzer" IsCheckable="True" Checked="ShowAnalyzer_Checked" Unchecked="ShowAnalyzer_Unchecked" />
 			</MenuItem>
-			<MenuItem Header="_Help">
-				<MenuItem Header="_About" Click="AboutClick" />
-			</MenuItem>
 		</Menu>
 		<!-- ToolBar -->
 		<ToolBar
@@ -135,7 +130,7 @@
 				VerticalAlignment="Stretch"
 				BorderBrush="Transparent" />
 			<!-- Right pane: Text Editor -->
-			<Grid Grid.Column="2">
+			<Grid Grid.Column="2" Name="rightPane">
 				<Grid.ColumnDefinitions>
 					<ColumnDefinition
 						Width="*" />
@@ -156,7 +151,7 @@
 					</DockPanel>
 				</Border>
 				
-				<textView:DecompilerTextView x:Name="decompilerTextView" Grid.Row="1" />
+				<!-- decompilerTextView is inserted into row 1 by code -->
 				
 				<GridSplitter
 					Grid.ZIndex="1"

ILSpy/MainWindow.xaml.cs

@@ -29,8 +29,10 @@ using System.Windows;
 using System.Windows.Controls;
 using System.Windows.Input;
 using System.Windows.Media.Imaging;
+
 using ICSharpCode.Decompiler;
 using ICSharpCode.Decompiler.FlowAnalysis;
+using ICSharpCode.ILSpy.TextView;
 using ICSharpCode.ILSpy.TreeNodes;
 using ICSharpCode.ILSpy.TreeNodes.Analyzer;
 using ICSharpCode.TreeView;
@@ -51,6 +53,9 @@ namespace ICSharpCode.ILSpy
 		AssemblyList assemblyList;
 		AssemblyListTreeNode assemblyListTreeNode;
 		
+		[Import]
+		DecompilerTextView decompilerTextView = null;
+		
 		static MainWindow instance;
 		
 		public static MainWindow Instance {
@@ -78,7 +83,9 @@ namespace ICSharpCode.ILSpy
 			this.WindowState = sessionSettings.WindowState;
 			
 			InitializeComponent();
-			decompilerTextView.mainWindow = this;
+			App.CompositionContainer.ComposeParts(this);
+			Grid.SetRow(decompilerTextView, 1);
+			rightPane.Children.Add(decompilerTextView);
 			
 			if (sessionSettings.SplitterPosition > 0 && sessionSettings.SplitterPosition < 1) {
 				leftColumn.Width = new GridLength(sessionSettings.SplitterPosition, GridUnitType.Star);
@@ -86,28 +93,38 @@ namespace ICSharpCode.ILSpy
 			}
 			sessionSettings.FilterSettings.PropertyChanged += filterSettings_PropertyChanged;
 			
-			App.CompositionContainer.ComposeParts(this);
+			InitMainMenu();
+			InitToolbar();
+			
+			this.Loaded += new RoutedEventHandler(MainWindow_Loaded);
+		}
+		
+		#region Toolbar extensibility
+		[ImportMany("ToolbarCommand", typeof(ICommand))]
+		Lazy<ICommand, IToolbarCommandMetadata>[] toolbarCommands = null;
+		
+		void InitToolbar()
+		{
 			int navigationPos = 0;
 			int openPos = 1;
-			foreach (var commandGroup in ToolbarCommands.GroupBy(c => c.Metadata.Category)) {
+			foreach (var commandGroup in toolbarCommands.OrderBy(c => c.Metadata.Order).GroupBy(c => c.Metadata.Category)) {
 				if (commandGroup.Key == "Navigation") {
-					foreach (var command in commandGroup.OrderBy(c => c.Metadata.Order)) {
+					foreach (var command in commandGroup) {
 						toolBar.Items.Insert(navigationPos++, MakeToolbarItem(command));
 						openPos++;
 					}
 				} else if (commandGroup.Key == "Open") {
-					foreach (var command in commandGroup.OrderBy(c => c.Metadata.Order)) {
+					foreach (var command in commandGroup) {
 						toolBar.Items.Insert(openPos++, MakeToolbarItem(command));
 					}
 				} else {
 					toolBar.Items.Add(new Separator());
-					foreach (var command in commandGroup.OrderBy(c => c.Metadata.Order)) {
+					foreach (var command in commandGroup) {
 						toolBar.Items.Add(MakeToolbarItem(command));
 					}
 				}
 			}
 			
-			this.Loaded += new RoutedEventHandler(MainWindow_Loaded);
 		}
 		
 		Button MakeToolbarItem(Lazy<ICommand, IToolbarCommandMetadata> command)
@@ -122,9 +139,41 @@ namespace ICSharpCode.ILSpy
 				}
 			};
 		}
+		#endregion
 		
-		[ImportMany]
-		internal Lazy<ICommand, IToolbarCommandMetadata>[] ToolbarCommands { get; set; }
+		#region Main Menu extensibility
+		[ImportMany("MainMenuCommand", typeof(ICommand))]
+		Lazy<ICommand, IMainMenuCommandMetadata>[] mainMenuCommands = null;
+		
+		void InitMainMenu()
+		{
+			foreach (var topLevelMenu in mainMenuCommands.OrderBy(c => c.Metadata.Order).GroupBy(c => c.Metadata.Menu)) {
+				var topLevelMenuItem = mainMenu.Items.OfType<MenuItem>().FirstOrDefault(m => (m.Header as string) == topLevelMenu.Key);
+				foreach (var category in topLevelMenu.GroupBy(c => c.Metadata.Category)) {
+					if (topLevelMenuItem == null) {
+						topLevelMenuItem = new MenuItem();
+						topLevelMenuItem.Header = topLevelMenu.Key;
+						mainMenu.Items.Add(topLevelMenuItem);
+					} else {
+						topLevelMenuItem.Items.Add(new Separator());
+					}
+					foreach (var entry in category) {
+						MenuItem menuItem = new MenuItem();
+						menuItem.Header = entry.Metadata.Header;
+						menuItem.Command = entry.Value;
+						if (!string.IsNullOrEmpty(entry.Metadata.Icon)) {
+							menuItem.Icon = new Image {
+								Width = 16,
+								Height = 16,
+								Source = Images.LoadImage(entry.Value, entry.Metadata.Icon)
+							};
+						}
+						topLevelMenuItem.Items.Add(menuItem);
+					}
+				}
+			}
+		}
+		#endregion
 		
 		void MainWindow_Loaded(object sender, RoutedEventArgs e)
 		{
@@ -375,18 +424,6 @@ namespace ICSharpCode.ILSpy
 		}
 		#endregion
 		
-		#region Exit/About
-		void ExitClick(object sender, RoutedEventArgs e)
-		{
-			Close();
-		}
-		
-		void AboutClick(object sender, RoutedEventArgs e)
-		{
-			AboutPage.Display(decompilerTextView);
-		}
-		#endregion
-		
 		#region Decompile / Save
 		void TreeView_SelectionChanged(object sender, SelectionChangedEventArgs e)
 		{

ILSpy/TextView/DecompilerTextView.cs

@@ -18,6 +18,7 @@
 
 using System;
 using System.Collections.Generic;
+using System.ComponentModel.Composition;
 using System.Diagnostics;
 using System.Globalization;
 using System.IO;
@@ -49,12 +50,12 @@ namespace ICSharpCode.ILSpy.TextView
 	/// Manages the TextEditor showing the decompiled code.
 	/// Contains all the threading logic that makes the decompiler work in the background.
 	/// </summary>
+	[Export, PartCreationPolicy(CreationPolicy.Shared)]
 	public sealed partial class DecompilerTextView : UserControl
 	{
 		readonly ReferenceElementGenerator referenceElementGenerator;
 		readonly UIElementGenerator uiElementGenerator;
 		FoldingManager foldingManager;
-		internal MainWindow mainWindow;
 		
 		DefinitionLookup definitionLookup;
 		CancellationTokenSource currentCancellationTokenSource;
@@ -477,7 +478,7 @@ namespace ICSharpCode.ILSpy.TextView
 					return;
 				}
 			}
-			mainWindow.JumpToReference(reference);
+			MainWindow.Instance.JumpToReference(reference);
 		}
 		
 		/// <summary>