Implemented WaitAdorner for long-running decompilation tasks.

ILSpy/ILSpy.csproj

@@ -130,6 +130,9 @@
     <Page Include="AboutDialog.xaml" />
     <Page Include="MainWindow.xaml" />
     <Page Include="OpenFromGacDialog.xaml" />
+    <Page Include="TextView\DecompilerTextView.xaml">
+      <DependentUpon>DecompilerTextView.cs</DependentUpon>
+    </Page>
     <Page Include="themes\generic.xaml" />
   </ItemGroup>
   <ItemGroup>

ILSpy/MainWindow.xaml

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Window
-	x:Class="ICSharpCode.ILSpy.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:tv="clr-namespace:ICSharpCode.TreeView;assembly=ICSharpCode.TreeView" xmlns:ae="clr-namespace:ICSharpCode.AvalonEdit;assembly=ICSharpCode.AvalonEdit"
+	x:Class="ICSharpCode.ILSpy.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:tv="clr-namespace:ICSharpCode.TreeView;assembly=ICSharpCode.TreeView"
-	xmlns:local="clr-namespace:ICSharpCode.ILSpy"
+	xmlns:local="clr-namespace:ICSharpCode.ILSpy" xmlns:textView="clr-namespace:ICSharpCode.ILSpy.TextView"
 	Title="ILSpy"
 	Width="790"
 	Height="500"
@@ -103,13 +103,7 @@
 			<!-- Right pane: Text Editor -->
 			<DockPanel
 				Grid.Column="2">
-				<ae:TextEditor
+				<textView:DecompilerTextView x:Name="decompilerTextView" />
-					Name="textEditor"
-					FontFamily="Consolas"
-					FontSize="10pt"
-					IsReadOnly="True"
-					Background="{DynamicResource {x:Static SystemColors.InfoBrushKey}}"
-					Foreground="{DynamicResource {x:Static SystemColors.InfoTextBrushKey}}" />
 			</DockPanel>
 		</Grid>
 	</DockPanel>

ILSpy/MainWindow.xaml.cs

@@ -45,7 +45,6 @@ namespace ICSharpCode.ILSpy
 	public partial class MainWindow : Window
 	{
 		AssemblyList assemblyList = new AssemblyList();
-		DecompilerTextView decompilerTextView;
 		FilterSettings filterSettings = new FilterSettings();
 		
 		static readonly System.Reflection.Assembly[] initialAssemblies = {
@@ -67,15 +66,13 @@ namespace ICSharpCode.ILSpy
 		{
 			this.DataContext = filterSettings;
 			InitializeComponent();
-			decompilerTextView = new DecompilerTextView(this, textEditor);
+			decompilerTextView.mainWindow = this;
 			
 			languageComboBox.Items.Add(new Decompiler.CSharpLanguage());
 			languageComboBox.Items.Add(new Disassembler.ILLanguage(false));
 			languageComboBox.Items.Add(new Disassembler.ILLanguage(true));
 			languageComboBox.SelectedItem = languageComboBox.Items[0];
 			
-			textEditor.Text = "Welcome to ILSpy!";
-			
 			AssemblyListTreeNode assemblyListTreeNode = new AssemblyListTreeNode(assemblyList);
 			assemblyListTreeNode.FilterSettings = filterSettings.Clone();
 			filterSettings.PropertyChanged += delegate {

ILSpy/TextView/DecompilerTextView.cs

@@ -6,8 +6,10 @@ using System.Collections.Generic;
 using System.Linq;
 using System.Threading;
 using System.Threading.Tasks;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Media.Animation;
 using System.Windows.Threading;
-
 using ICSharpCode.AvalonEdit;
 using Mono.Cecil;
 
@@ -16,39 +18,41 @@ namespace ICSharpCode.ILSpy.TextView
 	/// <summary>
 	/// Manages the TextEditor showing the decompiled code.
 	/// </summary>
-	sealed class DecompilerTextView
+	sealed partial class DecompilerTextView : UserControl
 	{
-		readonly MainWindow mainWindow;
-		readonly TextEditor textEditor;
 		readonly ReferenceElementGenerator referenceElementGenerator;
+		internal MainWindow mainWindow;
 		
 		DefinitionLookup definitionLookup;
 		CancellationTokenSource currentCancellationTokenSource;
 		
-		public DecompilerTextView(MainWindow mainWindow, TextEditor textEditor)
+		public DecompilerTextView()
 		{
-			if (mainWindow == null)
+			InitializeComponent();
-				throw new ArgumentNullException("mainWindow");
-			if (textEditor == null)
-				throw new ArgumentNullException("textEditor");
-			this.mainWindow = mainWindow;
-			this.textEditor = textEditor;
 			this.referenceElementGenerator = new ReferenceElementGenerator(this);
 			textEditor.TextArea.TextView.ElementGenerators.Add(referenceElementGenerator);
+			textEditor.Text = "Welcome to ILSpy!";
 		}
 		
 		public void Decompile(IEnumerable<ILSpyTreeNodeBase> treeNodes)
 		{
-			if (currentCancellationTokenSource != null)
+			if (waitAdorner.Visibility != Visibility.Visible) {
-				currentCancellationTokenSource.Cancel();
+				waitAdorner.Visibility = Visibility.Visible;
+				waitAdorner.BeginAnimation(OpacityProperty, new DoubleAnimation(0, 1, new Duration(TimeSpan.FromSeconds(0.5)), FillBehavior.Stop));
+			}
+			CancellationTokenSource previousCancellationTokenSource = currentCancellationTokenSource;
 			var myCancellationTokenSource = new CancellationTokenSource();
 			currentCancellationTokenSource = myCancellationTokenSource;
-			var task = RunDecompiler(Language.Current, treeNodes.ToArray(), myCancellationTokenSource.Token);
+			// cancel the previous only after current was set to the new one (avoid that the old one still finishes successfully)
+			if (previousCancellationTokenSource != null)
+				previousCancellationTokenSource.Cancel();
+			var task = RunDecompiler(ILSpy.Language.Current, treeNodes.ToArray(), myCancellationTokenSource.Token);
 			task.ContinueWith(
 				delegate {
 					try {
 						if (currentCancellationTokenSource == myCancellationTokenSource) {
 							currentCancellationTokenSource = null;
+							waitAdorner.Visibility = Visibility.Collapsed;
 							try {
 								SmartTextOutput textOutput = task.Result;
 								referenceElementGenerator.References = textOutput.References;
@@ -61,6 +65,12 @@ namespace ICSharpCode.ILSpy.TextView
 								definitionLookup = null;
 								textEditor.Text = string.Join(Environment.NewLine, ex.InnerExceptions.Select(ie => ie.ToString()));
 							}
+						} else {
+							try {
+								task.Wait();
+							} catch (AggregateException) {
+								// observe the exception (otherwise the task's finalizer will shut down the AppDomain)
+							}
 						}
 					} finally {
 						myCancellationTokenSource.Dispose();
@@ -69,7 +79,7 @@ namespace ICSharpCode.ILSpy.TextView
 				TaskScheduler.FromCurrentSynchronizationContext());
 		}
 		
-		static Task<SmartTextOutput> RunDecompiler(Language language, ILSpyTreeNodeBase[] nodes, CancellationToken cancellationToken)
+		static Task<SmartTextOutput> RunDecompiler(ILSpy.Language language, ILSpyTreeNodeBase[] nodes, CancellationToken cancellationToken)
 		{
 			return Task.Factory.StartNew(
 				delegate {
@@ -91,7 +101,7 @@ namespace ICSharpCode.ILSpy.TextView
 					textEditor.TextArea.Focus();
 					textEditor.Select(pos, 0);
 					textEditor.ScrollTo(textEditor.TextArea.Caret.Line, textEditor.TextArea.Caret.Column);
-					mainWindow.Dispatcher.Invoke(DispatcherPriority.Background, new Action(
+					Dispatcher.Invoke(DispatcherPriority.Background, new Action(
 						delegate {
 							CaretHighlightAdorner.DisplayCaretHighlightAnimation(textEditor.TextArea);
 						}));
@@ -113,5 +123,11 @@ namespace ICSharpCode.ILSpy.TextView
 				mainWindow.SelectNode(assemblyList.Assemblies.FirstOrDefault(node => node.AssemblyDefinition == reference));
 			}
 		}
+		
+		void cancelButton_Click(object sender, RoutedEventArgs e)
+		{
+			if (currentCancellationTokenSource != null)
+				currentCancellationTokenSource.Cancel();
+		}
 	}
 }

ILSpy/TextView/DecompilerTextView.xaml

@@ -0,0 +1,24 @@
+<UserControl x:Class="ICSharpCode.ILSpy.TextView.DecompilerTextView" x:ClassModifier="internal" x:Name="self"
+             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:ae="clr-namespace:ICSharpCode.AvalonEdit;assembly=ICSharpCode.AvalonEdit">
+	<UserControl.Resources>
+		<BooleanToVisibilityConverter x:Key="boolToVisibility" />
+	</UserControl.Resources>
+	<Grid>
+		<ae:TextEditor
+			Name="textEditor"
+			FontFamily="Consolas"
+			FontSize="10pt"
+			IsReadOnly="True"
+			Background="{DynamicResource {x:Static SystemColors.InfoBrushKey}}"
+			Foreground="{DynamicResource {x:Static SystemColors.InfoTextBrushKey}}" />
+		<Border Name="waitAdorner" Background="#80FFFFFF">
+			<StackPanel HorizontalAlignment="Center" VerticalAlignment="Center">
+				<TextBlock FontSize="14pt">Decompiling...</TextBlock>
+				<ProgressBar IsIndeterminate="True" Height="16" Margin="0, 4" />
+				<Button Click="cancelButton_Click" HorizontalAlignment="Center">Cancel</Button>
+			</StackPanel>
+		</Border>
+	</Grid>
+</UserControl>