Allow extending the toolbar using MEF.

ILSpy/Commands.cs

@@ -0,0 +1,53 @@
+// Copyright (c) AlphaSierraPapa for the SharpDevelop Team (for details please see \doc\copyright.txt)
+// This code is distributed under MIT X11 license (for details please see \doc\license.txt)
+
+using System;
+using System.Windows.Input;
+
+namespace ICSharpCode.ILSpy
+{
+	[ExportToolbarCommand(ToolTip = "Back", Icon = "Images/Back.png", Category = "Navigation")]
+	sealed class BrowseBackCommand : CommandWrapper {
+		public BrowseBackCommand() : base(NavigationCommands.BrowseBack) {}
+	}
+	
+	[ExportToolbarCommand(ToolTip = "Forward", Icon = "Images/Forward.png", Category = "Navigation", Order = 1)]
+	sealed class BrowseForwardCommand : CommandWrapper {
+		public BrowseForwardCommand() : base(NavigationCommands.BrowseForward) {}
+	}
+	
+	[ExportToolbarCommand(ToolTip = "Open", Icon = "Images/Open.png", Category = "Open")]
+	sealed class OpenCommand : CommandWrapper {
+		public OpenCommand() : base(ApplicationCommands.Open) {}
+	}
+	
+	[ExportToolbarCommand(ToolTip = "Reload all assemblies", Icon = "Images/Refresh.png", Category = "Open", Order = 1)]
+	sealed class RefreshCommand : CommandWrapper {
+		public RefreshCommand() : base(NavigationCommands.Refresh) {}
+	}
+	
+	class CommandWrapper : ICommand
+	{
+		ICommand wrappedCommand;
+		
+		public CommandWrapper(ICommand wrappedCommand)
+		{
+			this.wrappedCommand = wrappedCommand;
+		}
+		
+		public event EventHandler CanExecuteChanged {
+			add { wrappedCommand.CanExecuteChanged += value; }
+			remove { wrappedCommand.CanExecuteChanged -= value; }
+		}
+		
+		public void Execute(object parameter)
+		{
+			wrappedCommand.Execute(parameter);
+		}
+		
+		public bool CanExecute(object parameter)
+		{
+			return wrappedCommand.CanExecute(parameter);
+		}
+	}
+}

ILSpy/ExportCommandAttribute.cs

@@ -0,0 +1,35 @@
+// Copyright (c) AlphaSierraPapa for the SharpDevelop Team (for details please see \doc\copyright.txt)
+// This code is distributed under MIT X11 license (for details please see \doc\license.txt)
+
+using System;
+using System.ComponentModel.Composition;
+using System.Windows.Input;
+
+namespace ICSharpCode.ILSpy
+{
+	#region Toolbar
+	public interface IToolbarCommandMetadata
+	{
+		string Icon { get; }
+		string ToolTip { get; }
+		string Category { get; }
+		
+		double Order { get; }
+	}
+	
+	[MetadataAttribute]
+	[AttributeUsage(AttributeTargets.Class, AllowMultiple=false)]
+	public class ExportToolbarCommandAttribute : ExportAttribute
+	{
+		public ExportToolbarCommandAttribute()
+			: base(typeof(ICommand))
+		{
+		}
+		
+		public string ToolTip { get; set; }
+		public string Icon { get; set; }
+		public string Category { get; set; }
+		public double Order { get; set; }
+	}
+	#endregion
+}

ILSpy/ILSpy.csproj

@@ -88,6 +88,8 @@
     <Compile Include="AssemblyList.cs" />
     <Compile Include="AssemblyListManager.cs" />
     <Compile Include="BamlDecompiler.cs" />
+    <Compile Include="Commands.cs" />
+    <Compile Include="ExportCommandAttribute.cs" />
     <Compile Include="Controls\SearchBox.cs" />
     <Compile Include="Controls\SortableGridViewColumn.cs" />
     <Compile Include="CSharpLanguage.cs" />

ILSpy/Images/Images.cs

@@ -68,5 +68,17 @@ namespace ICSharpCode.ILSpy
 		
 		public static readonly BitmapImage Delete = LoadBitmap("Delete");
 		public static readonly BitmapImage Search = LoadBitmap("Search");
+		
+		public static BitmapImage LoadImage(object part, string icon)
+		{
+			Uri uri;
+			if (part.GetType().Assembly == typeof(Images).Assembly)
+				uri = new Uri("pack://application:,,,/" + icon);
+			else
+				throw new NotImplementedException();
+			BitmapImage image = new BitmapImage(uri);
+			image.Freeze();
+			return image;
+		}
 	}
 }

ILSpy/MainWindow.xaml

@@ -83,19 +83,9 @@
 					</Style.Triggers>
 				</Style>
 			</ToolBar.Resources>
-			<Button Command="BrowseBack" ToolTip="Back">
+			<!-- 'Navigation' toolbar category is inserted here -->
-				<Image Width="16" Height="16" Source="Images/Back.png" />
-			</Button>
-			<Button Command="BrowseForward" ToolTip="Forward">
-				<Image Width="16" Height="16" Source="Images/Forward.png" />
-			</Button>
 			<Separator />
-			<Button Command="Open" ToolTip="Open">
+			<!-- 'Open' toolbar category is inserted here -->
-				<Image Width="16" Height="16" Source="Images/Open.png" />
-			</Button>
-			<Button Command="Refresh" ToolTip="Reload all assemblies">
-				<Image Width="16" Height="16" Source="Images/Refresh.png" />
-			</Button>
 			<Separator />
 			<CheckBox IsChecked="{Binding FilterSettings.ShowInternalApi}" ToolTip="Show internal types and members">
 				<Image Width="16" Height="16" Source="Images/PrivateInternal.png" />

ILSpy/MainWindow.xaml.cs

@@ -18,8 +18,10 @@
 
 using System;
 using System.Collections.Generic;
+using System.Collections.ObjectModel;
 using System.Collections.Specialized;
 using System.ComponentModel;
+using System.ComponentModel.Composition;
 using System.Diagnostics;
 using System.Linq;
 using System.Threading.Tasks;
@@ -84,9 +86,46 @@ namespace ICSharpCode.ILSpy
 			}
 			sessionSettings.FilterSettings.PropertyChanged += filterSettings_PropertyChanged;
 			
+			App.CompositionContainer.ComposeParts(this);
+			int navigationPos = 0;
+			int openPos = 1;
+			foreach (var commandGroup in ToolbarCommands.GroupBy(c => c.Metadata.Category)) {
+				if (commandGroup.Key == "Navigation") {
+					foreach (var command in commandGroup.OrderBy(c => c.Metadata.Order)) {
+						toolBar.Items.Insert(navigationPos++, MakeToolbarItem(command));
+						openPos++;
+					}
+				} else if (commandGroup.Key == "Open") {
+					foreach (var command in commandGroup.OrderBy(c => c.Metadata.Order)) {
+						toolBar.Items.Insert(openPos++, MakeToolbarItem(command));
+					}
+				} else {
+					toolBar.Items.Add(new Separator());
+					foreach (var command in commandGroup.OrderBy(c => c.Metadata.Order)) {
+						toolBar.Items.Add(MakeToolbarItem(command));
+					}
+				}
+			}
+			
 			this.Loaded += new RoutedEventHandler(MainWindow_Loaded);
 		}
 		
+		Button MakeToolbarItem(Lazy<ICommand, IToolbarCommandMetadata> command)
+		{
+			return new Button {
+				Command = command.Value,
+				ToolTip = command.Metadata.ToolTip,
+				Content = new Image {
+					Width = 16,
+					Height = 16,
+					Source = Images.LoadImage(command.Value, command.Metadata.Icon)
+				}
+			};
+		}
+		
+		[ImportMany]
+		internal Lazy<ICommand, IToolbarCommandMetadata>[] ToolbarCommands { get; set; }
+		
 		void MainWindow_Loaded(object sender, RoutedEventArgs e)
 		{
 			ILSpySettings spySettings = this.spySettings;