context: // Permission is hereby granted, free of charge, to any person obtaining
  // a copy of this software and associated documentation files (the
  // "Software"), to deal in the Software without restriction, including
  // without limitation the rights to use, copy, modify, merge, publish,
  // distribute, sublicense, and/or sell copies of the Software, and to
  // permit persons to whom the Software is furnished to do so, subject to
  // the following conditions:
  // 
  // The above copyright notice and this permission notice shall be
  // included in all copies or substantial portions of the Software.
  // 
  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  //
  // Copyright (c) 2005 Novell, Inc. (http://www.novell.com)
  //
  // Authors:
  //	Peter Dennis Bartok	(pbartok@novell.com)
  //	Alexander Olk		(alex.olk@googlemail.com)
  //
  //
  
  using System.Drawing;
  using System.Runtime.InteropServices;
  using System.IO;
  using System;
  
  namespace System.Windows.Forms {
  	internal class X11DesktopColors {
  		#region Structs	& Enums
  		[StructLayout(LayoutKind.Sequential)]	
  		internal struct GdkColorStruct {
  			internal int pixel;
  			internal short red;
  			internal short green;
  			internal short blue;
  		}
  
  		[StructLayout(LayoutKind.Sequential)]	
  		internal struct GObjectStruct {
  			public IntPtr Instance;
  			public IntPtr ref_count;
  			public IntPtr data;
  		}
  
  		[StructLayout(LayoutKind.Sequential)]
  		internal struct GtkStyleStruct {
  			internal GObjectStruct obj;
  			[MarshalAs(System.Runtime.InteropServices.UnmanagedType.ByValArray, SizeConst=5)]
  			internal GdkColorStruct[] fg;
  			[MarshalAs(System.Runtime.InteropServices.UnmanagedType.ByValArray, SizeConst=5)]
  			internal GdkColorStruct[] bg;
  			[MarshalAs(System.Runtime.InteropServices.UnmanagedType.ByValArray, SizeConst=5)]
  			internal GdkColorStruct[] light;
  			[MarshalAs(System.Runtime.InteropServices.UnmanagedType.ByValArray, SizeConst=5)]
  			internal GdkColorStruct[] dark;
  			[MarshalAs(System.Runtime.InteropServices.UnmanagedType.ByValArray, SizeConst=5)]
  			internal GdkColorStruct[] mid;
  			[MarshalAs(System.Runtime.InteropServices.UnmanagedType.ByValArray, SizeConst=5)]
  			internal GdkColorStruct[] text;
  			[MarshalAs(System.Runtime.InteropServices.UnmanagedType.ByValArray, SizeConst=5)]
  			internal GdkColorStruct[] baseclr;
  			[MarshalAs(System.Runtime.InteropServices.UnmanagedType.ByValArray, SizeConst=5)]
  			internal GdkColorStruct[] text_aa;              /* Halfway between text/base */
  
  			internal GdkColorStruct black;
  			internal GdkColorStruct white;
  
  			/* TODO: There is more stuff that we will add when we need it*/
  		}
  
  		private enum Desktop {
  			Gtk,
  			KDE,
  			Unknown
  		}
  		#endregion	// Structs & Enums
  
  		#region Local Variables
  		static private Desktop		desktop;
  		#endregion	// Local Variables
  
  		#region Constructors
  		static X11DesktopColors() {
  			FindDesktopEnvironment();
  			
  			switch(desktop) {
  				case Desktop.Gtk: {
  					//IntPtr		dispmgr;
  					//IntPtr		gdkdisplay;
  					IntPtr		widget;
  					IntPtr		style_ptr;
  					GtkStyleStruct	style;
  
  					try {
  						GtkInit();
  						//dispmgr =  gdk_display_manager_get ();
  						//gdkdisplay =  gdk_display_manager_get_default_display (dispmgr);
  
  						widget = gtk_invisible_new ();
  						gtk_widget_ensure_style (widget);
  						style_ptr = gtk_widget_get_style (widget);
  
  						style = (GtkStyleStruct) Marshal.PtrToStructure (style_ptr, typeof (GtkStyleStruct));
  						
  						ThemeEngine.Current.ColorControl = ColorFromGdkColor (style.bg[0]);
  						ThemeEngine.Current.ColorControlText = ColorFromGdkColor (style.fg[0]);
  						ThemeEngine.Current.ColorControlDark = ColorFromGdkColor (style.dark[0]);
  						ThemeEngine.Current.ColorControlLight = ColorFromGdkColor (style.light[0]);
  						ThemeEngine.Current.ColorControlLightLight = ControlPaint.Light (ThemeEngine.Current.ColorControlLight);
  						ThemeEngine.Current.ColorControlDarkDark = ControlPaint.Dark (ThemeEngine.Current.ColorControlDark);
  
  						// We don't want ControlLight to disappear on a white background!
  						if (ThemeEngine.Current.ColorControlLight.ToArgb () == Color.White.ToArgb ()) {
  							ThemeEngine.Current.ColorControlLight = Color.FromArgb (255, 227, 227, 227);
  						}
  						widget = gtk_menu_new ();
  						gtk_widget_ensure_style (widget);
  						style_ptr = gtk_widget_get_style (widget);
  
  						style = (GtkStyleStruct) Marshal.PtrToStructure (style_ptr, typeof (GtkStyleStruct));
  
  						ThemeEngine.Current.ColorMenu = ColorFromGdkColor (style.bg [0]);
  						ThemeEngine.Current.ColorMenuText = ColorFromGdkColor (style.text [0]);
  					}
  
  					catch (DllNotFoundException) {
  						Console.Error.WriteLine("Gtk not found (missing LD_LIBRARY_PATH to libgtk-x11-2.0.so.0?), using built-in colorscheme");
  					}
  
  					catch {
  						Console.Error.WriteLine("Gtk colorscheme read failure, using built-in colorscheme");
  					}
  					break;
  				}
  					
  				case Desktop.KDE: {
  						if (! ReadKDEColorsheme() )
  							Console.Error.WriteLine("KDE colorscheme read failure, using built-in colorscheme");
  						break;
  					}
  					
  				default: {
  					break;
  				}
  			}
  		}
  
  		static void GtkInit ()
  		{
  			gtk_init_check (IntPtr.Zero, IntPtr.Zero);
  		}
  		#endregion	// Constructors
  
  		#region Properties
  		static void FindDesktopEnvironment() {
  			desktop = Desktop.Gtk;
  			string session =  Environment.GetEnvironmentVariable("DESKTOP_SESSION");
  				
  			if ( session != null ) {
  				session = session.ToUpper( );
  					
  				if ( session == "DEFAULT" ) {
  					string helper = Environment.GetEnvironmentVariable("KDE_FULL_SESSION");
  						
  					if ( helper != null )
  						desktop = Desktop.KDE;
  				} else
  				if ( session.StartsWith("KDE") )
  					desktop = Desktop.KDE;
  			}
  		}
  		#endregion	// Properties
  
  		#region Methods
  		static internal void Initialize() {
  			// Do nothing; all is done in our static ctor
  		}
  
  		private static Color ColorFromGdkColor (GdkColorStruct gtkcolor) {
  			return Color.FromArgb (255, 
  				(gtkcolor.red >> 8)  & 0xff, 
  				(gtkcolor.green  >> 8) & 0xff,
  				(gtkcolor.blue >> 8) & 0xff );
  		}
  		
  		private static bool ReadKDEColorsheme() {
  			string full_kdegloabals_filename = Environment.GetFolderPath(Environment.SpecialFolder.Personal)
  				+ "/"
  				+ ".kde/share/config/kdeglobals";
  			
  			if (!File.Exists(full_kdegloabals_filename)) 
  				return false;
  			
  			StreamReader sr = new StreamReader(full_kdegloabals_filename);
  			
  			string line = sr.ReadLine();
  			
  			Color tmp_color;
  			
  			while (line != null) {
  				line = line.Trim();
  				
  				if (line.StartsWith( "background=")) {
  					tmp_color = GetColorFromKDEString(line);
  					
  					if (tmp_color != Color.Empty) {
  						ThemeEngine.Current.ColorControl = tmp_color;
  						ThemeEngine.Current.ColorMenu = tmp_color;
  					}
  				} else
  				if (line.StartsWith( "foreground=")) {
  					tmp_color = GetColorFromKDEString(line);
  					
  					if (tmp_color != Color.Empty) {
  						ThemeEngine.Current.ColorControlText = tmp_color;
  						ThemeEngine.Current.ColorMenuText = tmp_color;						
  					}
  				} else
  				if (line.StartsWith("selectBackground")) {
  					tmp_color = GetColorFromKDEString(line);
  					
  					if (tmp_color != Color.Empty) {
  						ThemeEngine.Current.ColorHighlight = tmp_color;
  					}
  				} else
  				if (line.StartsWith("selectForeground")) {
  					tmp_color = GetColorFromKDEString(line);
  					
  					if (tmp_color != Color.Empty) {
  						ThemeEngine.Current.ColorHighlightText = tmp_color;
  					}
  				}
  				
  				line = sr.ReadLine();
  			}
  			
  			sr.Close();
  			
  			return true;
  		}
  		
  		private static Color GetColorFromKDEString(string line) {
  			string[] split = line.Split(new char[] {'='});
  			
  			if (split.Length > 0) {
  
gt: 				line = split[1];