Moved direct WinAPI access into a service

Eve-O-Preview/DwmAPI/Implementation/DwmThumbnail.cs

@@ -0,0 +1,76 @@
+using System;
+using EveOPreview.DwmInterop;
+
+namespace EveOPreview.DwmAPI
+{
+	class DwmThumbnail : IDwmThumbnail
+	{
+		#region Private fields
+		private readonly IWindowManager _windowManager;
+		private IntPtr _handle;
+		private DWM_THUMBNAIL_PROPERTIES _properties;
+		#endregion
+
+		public DwmThumbnail(IWindowManager windowManager)
+		{
+			this._windowManager = windowManager;
+		}
+
+		public void Register(IntPtr destination, IntPtr source)
+		{
+			this._properties = new DWM_THUMBNAIL_PROPERTIES();
+			this._properties.dwFlags = DWM_TNP_CONSTANTS.DWM_TNP_VISIBLE
+									  + DWM_TNP_CONSTANTS.DWM_TNP_OPACITY
+									  + DWM_TNP_CONSTANTS.DWM_TNP_RECTDESTINATION
+									  + DWM_TNP_CONSTANTS.DWM_TNP_SOURCECLIENTAREAONLY;
+			this._properties.opacity = 255;
+			this._properties.fVisible = true;
+			this._properties.fSourceClientAreaOnly = true;
+
+			if (!this._windowManager.IsCompositionEnabled)
+			{
+				return;
+			}
+
+			this._handle = DwmApiNativeMethods.DwmRegisterThumbnail(destination, source);
+		}
+
+		public void Unregister()
+		{
+			if (!this._windowManager.IsCompositionEnabled)
+			{
+				return;
+			}
+
+			try
+			{
+				DwmApiNativeMethods.DwmUnregisterThumbnail(this._handle);
+			}
+			catch (ArgumentException)
+			{
+			}
+		}
+
+		public void Move(int left, int top, int right, int bottom)
+		{
+			this._properties.rcDestination = new RECT(left, top, right, bottom);
+		}
+
+		public void Update()
+		{
+			if (!this._windowManager.IsCompositionEnabled)
+			{
+				return;
+			}
+
+			try
+			{
+				DwmApiNativeMethods.DwmUpdateThumbnailProperties(this._handle, this._properties);
+			}
+			catch (ArgumentException)
+			{
+				//This exception will be thrown if the EVE client disappears while this method is running
+			}
+		}
+	}
+}