ShiftOS-C-/source/ShiftUI/System.Windows.Forms.VisualStyles/VisualStylesEngine.cs

//
// VisualStylesEngine.cs: Selects and provides an IVisualStyles.
//
// 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) 2008 George Giolfan
//
// Authors:
//	George Giolfan (georgegiolfan@yahoo.com)
//
using System;

namespace ShiftUI.VisualStyles
{
	class VisualStylesEngine
	{
		static IVisualStyles instance = Initialize ();
		public static IVisualStyles Instance {
			get { return instance; }
		}
		static IVisualStyles Initialize ()
		{
			string environment_variable = Environment.GetEnvironmentVariable("MONO_VISUAL_STYLES");
			if (environment_variable != null)
				environment_variable = environment_variable.ToLower ();
			if (
#if !VISUAL_STYLES_USE_GTKPLUS_ON_WINDOWS
				environment_variable == "gtkplus" &&
#endif
				VisualStylesGtkPlus.Initialize ())
				return new VisualStylesGtkPlus ();
			return new VisualStylesNative ();
		}
	}
}