Read unknown project items from MSBuild files, allow project to override creation of project items (patch by Scott Ferrett).

git-svn-id: svn://svn.sharpdevelop.net/sharpdevelop/trunk@784 1ccf3a8d-04fe-1044-b7c0-cef0b8235c61

src/Main/Base/Project/Src/Project/AbstractProject.cs

@@ -690,6 +690,11 @@ namespace ICSharpCode.SharpDevelop.Project
 			return ParseProjectContent.CreateUninitalized(this);
 		}
 
+		public virtual ProjectItem CreateProjectItem(string itemType)
+		{
+			return new UnknownProjectItem(this, itemType);
+		}
+		
 		/// <summary>
 		/// Saves project preferences (currently opened files, bookmarks etc.) to the
 		/// a property container.

src/Main/Base/Project/Src/Project/IProject.cs

@@ -111,6 +111,12 @@ namespace ICSharpCode.SharpDevelop.Project
 		/// </summary>
 		ParseProjectContent CreateProjectContent();
 		
+		/// <summary>
+		/// Creates a new projectItem for the passed itemType
+		/// This method should only be called by ProjectItemFactory.CreateProjectItem()!
+		/// </summary>
+		ProjectItem CreateProjectItem(string itemType);
+
 		CompilerResults Build();
 		CompilerResults Rebuild();
 		CompilerResults Clean();

src/Main/Base/Project/Src/Project/Items/ProjectItem.cs

@@ -131,7 +131,7 @@ namespace ICSharpCode.SharpDevelop.Project
 		
 		public static ProjectItem ReadItem(XmlTextReader reader, IProject project, string itemType)
 		{
-			ProjectItem newItem = ProjectItemFactory.CreateProjectItem(project, itemType);
+			ProjectItem newItem = project != null ? project.CreateProjectItem(itemType) : ProjectItemFactory.CreateProjectItem(project, itemType);
 			newItem.Include  = reader.GetAttribute("Include");
 			if (!reader.IsEmptyElement) {
 				PropertyGroup.ReadProperties(reader, newItem.Properties, itemType);

src/Main/Base/Project/Src/Project/MSBuildProject.cs

@@ -66,6 +66,11 @@ namespace ICSharpCode.SharpDevelop.Project
 		}
 		
 		#region Xml reading routines
+		public override ProjectItem CreateProjectItem(string itemType)
+		{
+			return ProjectItemFactory.CreateProjectItem(this, itemType);
+		}
+
 		static PropertyGroup ReadPropertyGroup(XmlReader reader)
 		{
 			PropertyGroup properties = new PropertyGroup();