Use WPF for file conflict dialog.

MessageService.ShowCustomDialog() does not set focus
to the accept button.
Extract common code from the NuGet addin dialogs.

src/AddIns/Misc/PackageManagement/Project/PackageManagement.csproj

@@ -148,6 +148,11 @@
     <Compile Include="Src\EnvDTE\TextPoint.cs" />
     <Compile Include="Src\EnvDTE\Window.cs" />
     <Compile Include="Src\FileConflictResolver.cs" />
+    <Compile Include="Src\FileConflictView.xaml.cs">
+      <DependentUpon>FileConflictView.xaml</DependentUpon>
+      <SubType>Code</SubType>
+    </Compile>
+    <Compile Include="Src\FileConflictViewModel.cs" />
     <Compile Include="Src\IClassKindUpdater.cs" />
     <Compile Include="Src\IDocumentNamespaceCreator.cs" />
     <Compile Include="Src\IPackageExtensions.cs" />
@@ -226,6 +231,7 @@
     <Compile Include="Src\PackageManagementServiceProvider.cs" />
     <Compile Include="Src\ProjectBuilder.cs" />
     <Compile Include="Src\ResolveFileConflictEventArgs.cs" />
+    <Compile Include="Src\ServiceWithWorkbenchOwner.cs" />
     <Compile Include="Src\VirtualMethodUpdater.cs" />
     <Compile Include="Src\NewProjectsCreated.cs" />
     <Compile Include="Src\OpenMSBuildProjects.cs" />
@@ -480,6 +486,7 @@
     <Compile Include="Src\VisualStudio\VsSolution.cs" />
   </ItemGroup>
   <ItemGroup>
+    <Page Include="Src\FileConflictView.xaml" />
     <Page Include="Src\ManagePackagesView.xaml" />
     <Page Include="Src\LicenseAcceptanceView.xaml" />
     <Page Include="Src\PackageManagementOptionsView.xaml" />

src/AddIns/Misc/PackageManagement/Project/Src/FileConflictResolver.cs

@@ -7,38 +7,22 @@ using NuGet;
 
 namespace ICSharpCode.PackageManagement
 {
-	public class FileConflictResolver : IFileConflictResolver
+	public class FileConflictResolver : ServiceWithWorkbenchOwner, IFileConflictResolver
 	{
-		string[] buttons = new string[] { "Yes", "Yes to All", "No", "No to All" };
-		
-		const int YesButtonIndex = 0;
-		const int YesToAllButtonIndex = 1;
-		const int NoButtonIndex = 2;
-		const int NoToAllButtonIndex = 3;
-		
 		public FileConflictResolution ResolveFileConflict(string message)
 		{
-			int result = MessageService.ShowCustomDialog(
-				"File Conflict",
-				message,
-				NoButtonIndex, // "No" is default accept button.
-				-1,
-				buttons);
-			return MapResultToFileConflictResolution(result);
+			var viewModel = new FileConflictViewModel(message);
+			FileConflictView view = CreateFileConflictView(viewModel);
+			view.ShowDialog();
+			return viewModel.GetResolution();
 		}
 		
-		FileConflictResolution MapResultToFileConflictResolution(int result)
+		FileConflictView CreateFileConflictView(FileConflictViewModel viewModel)
 		{
-			switch (result) {
-				case YesButtonIndex:
-					return FileConflictResolution.Overwrite;
-				case YesToAllButtonIndex:
-					return FileConflictResolution.OverwriteAll;
-				case NoToAllButtonIndex:
-					return FileConflictResolution.IgnoreAll;
-				default:
-					return FileConflictResolution.Ignore;
-			}
+			var view = new FileConflictView();
+			view.ViewModel = viewModel;
+			view.Owner = Owner;
+			return view;
 		}
 	}
 }

src/AddIns/Misc/PackageManagement/Project/Src/FileConflictView.xaml

@@ -0,0 +1,63 @@
+<Window
+	x:Class="ICSharpCode.PackageManagement.FileConflictView"
+	xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+	xmlns:core="http://icsharpcode.net/sharpdevelop/core"
+	xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+	Title="File Conflict"
+	FocusManager.FocusedElement="{Binding ElementName=NoButton}"
+	WindowStartupLocation="CenterOwner"
+	Style="{x:Static core:GlobalStyles.DialogWindowStyle}"
+	MinHeight="150"
+	Height="150"
+	MinWidth="400"
+	Width="200">
+	
+	<Window.Resources>
+		<Style TargetType="Button" BasedOn="{x:Static core:GlobalStyles.ButtonStyle}"/>
+	</Window.Resources>
+	
+	<Grid>
+		<Grid.ColumnDefinitions>
+			<ColumnDefinition Width="*"/>
+			<ColumnDefinition Width="Auto"/>
+			<ColumnDefinition Width="Auto"/>
+			<ColumnDefinition Width="Auto"/>
+			<ColumnDefinition Width="Auto"/>
+		</Grid.ColumnDefinitions>
+		<Grid.RowDefinitions>
+			<RowDefinition Height="*"/>
+			<RowDefinition Height="Auto"/>
+		</Grid.RowDefinitions>
+		<TextBlock
+			Margin="5"
+			Text="{Binding Message}"
+			Grid.ColumnSpan="5"
+			TextWrapping="Wrap"/>
+		<Button
+			Margin="4"
+			Grid.Row="1"
+			Grid.Column="1"
+			Command="{Binding YesCommand}"
+			Content="Yes"/>
+		<Button
+			Margin="4"
+			Grid.Row="1"
+			Grid.Column="2"
+			Command="{Binding YesToAllCommand}"
+			Content="Yes to All"/>
+		<Button
+			x:Name="NoButton"
+			Margin="4"
+			Grid.Row="1"
+			Grid.Column="3"
+			IsDefault="True"
+			Command="{Binding NoCommand}"
+			Content="No"/>
+		<Button
+			Margin="4"
+			Grid.Row="1"
+			Grid.Column="4"
+			Command="{Binding NoToAllCommand}"
+			Content="No to All"/>
+	</Grid>
+</Window>

src/AddIns/Misc/PackageManagement/Project/Src/FileConflictView.xaml.cs

@@ -0,0 +1,32 @@
+// Copyright (c) AlphaSierraPapa for the SharpDevelop Team (for details please see \doc\copyright.txt)
+// This code is distributed under the GNU LGPL (for details please see \doc\license.txt)
+
+using System;
+using System.Windows;
+
+namespace ICSharpCode.PackageManagement
+{
+	public partial class FileConflictView : Window
+	{
+		FileConflictViewModel viewModel;
+		
+		public FileConflictView()
+		{
+			InitializeComponent();
+		}
+		
+		public FileConflictViewModel ViewModel {
+			get { return viewModel; }
+			set {
+				viewModel = value;
+				viewModel.Close += CloseView;
+				DataContext = viewModel;
+			}
+		}
+		
+		void CloseView(object sender, EventArgs e)
+		{
+			DialogResult = true;
+		}
+	}
+}

src/AddIns/Misc/PackageManagement/Project/Src/FileConflictViewModel.cs

@@ -0,0 +1,48 @@
+// Copyright (c) AlphaSierraPapa for the SharpDevelop Team (for details please see \doc\copyright.txt)
+// This code is distributed under the GNU LGPL (for details please see \doc\license.txt)
+
+using System;
+using System.Windows.Input;
+using NuGet;
+
+namespace ICSharpCode.PackageManagement
+{
+	public class FileConflictViewModel
+	{
+		FileConflictResolution resolution = FileConflictResolution.Ignore;
+		
+		public FileConflictViewModel(string message)
+		{
+			this.Message = message;
+			CreateCommands();
+		}
+		
+		void CreateCommands()
+		{
+			YesCommand = new DelegateCommand(param => UpdateResolution(FileConflictResolution.Overwrite));
+			YesToAllCommand = new DelegateCommand(param => UpdateResolution(FileConflictResolution.OverwriteAll));
+			NoCommand = new DelegateCommand(param => UpdateResolution(FileConflictResolution.Ignore));
+			NoToAllCommand = new DelegateCommand(param => UpdateResolution(FileConflictResolution.IgnoreAll));
+		}
+		
+		void UpdateResolution(FileConflictResolution resolution)
+		{
+			this.resolution = resolution;
+			Close(this, new EventArgs());
+		}
+		
+		public event EventHandler Close;
+		
+		public ICommand YesCommand { get; private set; }
+		public ICommand YesToAllCommand { get; private set; }
+		public ICommand NoCommand { get; private set; }
+		public ICommand NoToAllCommand { get; private set; }
+		
+		public string Message { get; private set; }
+		
+		public FileConflictResolution GetResolution()
+		{
+			return resolution;
+		}
+	}
+}

src/AddIns/Misc/PackageManagement/Project/Src/LicenseAcceptanceService.cs

@@ -10,20 +10,8 @@ using NuGet;
 
 namespace ICSharpCode.PackageManagement
 {
-	public class LicenseAcceptanceService : ILicenseAcceptanceService
+	public class LicenseAcceptanceService : ServiceWithWorkbenchOwner, ILicenseAcceptanceService
 	{
-		Window owner;
-		
-		public Window Owner {
-			get {
-				if (owner == null) {
-					owner = WorkbenchSingleton.MainWindow;
-				}
-				return owner;
-			}
-			set { owner = value; }
-		}
-		
 		public bool AcceptLicenses(IEnumerable<IPackage> packages)
 		{
 			LicenseAcceptanceView view = CreateLicenseAcceptanceView(packages);

src/AddIns/Misc/PackageManagement/Project/Src/SelectProjectsService.cs

@@ -8,20 +8,8 @@ using ICSharpCode.SharpDevelop.Gui;
 
 namespace ICSharpCode.PackageManagement
 {
-	public class SelectProjectsService : ISelectProjectsService
+	public class SelectProjectsService : ServiceWithWorkbenchOwner, ISelectProjectsService
 	{
-		Window owner;
-		
-		public Window Owner {
-			get {
-				if (owner == null) {
-					owner = WorkbenchSingleton.MainWindow;
-				}
-				return owner;
-			}
-			set { owner = value; }
-		}
-		
 		public bool SelectProjects(IEnumerable<IPackageManagementSelectedProject> projects)
 		{
 			SelectProjectsView view = CreateSelectProjectsView(projects);

src/AddIns/Misc/PackageManagement/Project/Src/ServiceWithWorkbenchOwner.cs

@@ -0,0 +1,24 @@
+// Copyright (c) AlphaSierraPapa for the SharpDevelop Team (for details please see \doc\copyright.txt)
+// This code is distributed under the GNU LGPL (for details please see \doc\license.txt)
+
+using System;
+using System.Windows;
+using ICSharpCode.SharpDevelop.Gui;
+
+namespace ICSharpCode.PackageManagement
+{
+	public class ServiceWithWorkbenchOwner
+	{
+		Window owner;
+		
+		public Window Owner {
+			get {
+				if (owner == null) {
+					owner = WorkbenchSingleton.MainWindow;
+				}
+				return owner;
+			}
+			set { owner = value; }
+		}
+	}
+}