That was easy - moved TemporaryFileManager from engine-specific WindowsForms.UserInterface to engine-agnostic UserInterface library

CSharp/Engines/WindowsForms/Libraries/UniversalEditor.UserInterface.WindowsForms/UniversalEditor.UserInterface.WindowsForms.csproj

@@ -149,7 +149,6 @@
       <DesignTime>True</DesignTime>
       <DependentUpon>Resources.resx</DependentUpon>
     </Compile>
-    <Compile Include="TemporaryFileManager.cs" />
     <Compile Include="VirtualFileDataObject.cs" />
   </ItemGroup>
   <ItemGroup>

CSharp/Libraries/UniversalEditor.UserInterface/TemporaryFileManager.cs

@@ -0,0 +1,74 @@
+using System;
+
+namespace UniversalEditor.UserInterface
+{
+	public class TemporaryFileManager
+	{
+		private static Random rand = new Random();
+
+		private static System.Collections.Specialized.StringCollection mvarTemporaryFileNames = new System.Collections.Specialized.StringCollection();
+		private static string mvarTemporaryFilePath = null;
+
+		public static string CreateTemporaryFile(string FileName, byte[] FileData = null)
+		{
+			if (mvarTemporaryFilePath == null) throw new InvalidOperationException();
+			if (!System.IO.Directory.Exists(mvarTemporaryFilePath))
+			{
+				System.IO.Directory.CreateDirectory(mvarTemporaryFilePath);
+			}
+
+			FileName = System.IO.Path.GetFileName(FileName);
+
+			string filePath = mvarTemporaryFilePath + System.IO.Path.DirectorySeparatorChar.ToString() + FileName;
+			if (FileData != null) System.IO.File.WriteAllBytes(filePath, FileData);
+			mvarTemporaryFileNames.Add(filePath);
+			return filePath;
+		}
+
+		public static bool RegisterTemporaryDirectory(string prefix, int maxNameLength)
+		{
+			if (mvarTemporaryFilePath != null)
+			{
+				return false;
+			}
+			string name = String.Empty;
+			do
+			{
+				name = prefix + rand.Next(0, (maxNameLength * 10) - 1).ToString().PadLeft(maxNameLength - prefix.Length, '0');
+			}
+			while (System.IO.Directory.Exists(name));
+
+			string pathName = System.IO.Path.GetTempPath() + System.IO.Path.DirectorySeparatorChar.ToString() + name;
+			System.IO.Directory.CreateDirectory(pathName);
+
+			mvarTemporaryFilePath = pathName;
+			return true;
+		}
+		public static bool UnregisterTemporaryDirectory()
+		{
+			if (mvarTemporaryFilePath == null) return false;
+
+			System.Collections.Generic.List<string> fileNamesNotDeleted = new System.Collections.Generic.List<string>();
+
+			foreach (string fileName in mvarTemporaryFileNames)
+			{
+				if (System.IO.File.Exists(fileName))
+				{
+					try
+					{
+						System.IO.File.Delete(fileName);
+					}
+					catch (Exception ex)
+					{
+						fileNamesNotDeleted.Add(fileName);
+					}
+				}
+			}
+			if (System.IO.Directory.Exists(mvarTemporaryFilePath) && fileNamesNotDeleted.Count == 0)
+			{
+				System.IO.Directory.Delete(mvarTemporaryFilePath, true);
+			}
+			return true;
+		}
+	}
+}

CSharp/Libraries/UniversalEditor.UserInterface/UniversalEditor.UserInterface.csproj

@@ -80,6 +80,7 @@
     <Compile Include="SessionManager.cs" />
     <Compile Include="Settings\SettingsManager.cs" />
     <Compile Include="SingleInstanceManager.cs" />
+    <Compile Include="TemporaryFileManager.cs" />
     <Compile Include="Toolbar.cs" />
     <Compile Include="Toolbox.cs" />
     <Compile Include="UnsavedDocumentOption.cs" />