--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/taskswitcher/contextengine/hgfswpreviewprovider/inc/hgpreviewobserver.h	Mon Jan 18 20:10:36 2010 +0200
@@ -0,0 +1,60 @@
+/*
+* ==============================================================================
+*  Name        : %name: hgpreviewobserver.h %
+*  Part of     : Hg fast swap preview provider plugin
+*  Description : Preview provider API
+*  Version     : %version: 1 %
+*
+*  Copyright (c) 2008 Nokia Corporation.
+*  This material, including documentation and any related
+*  computer programs, is protected by copyright controlled by
+*  Nokia Corporation. All rights are reserved. Copying,
+*  including reproducing, storing, adapting or translating, any
+*  or all of this material requires the prior written consent of
+*  Nokia Corporation. This material also contains confidential
+*  information which may not be disclosed to others without the
+*  prior written consent of Nokia Corporation.
+* ==============================================================================
+*/
+
+#ifndef HGPREVIEWOBSERVER_H
+#define HGPREVIEWOBSERVER_H
+
+// INCLUDES
+#include <e32base.h>
+
+/**
+ * Observer for preview screenshot changes. Client must implement this and 
+ * register itself when calling CHgFastSwapPreviewProvider::NewL. Callback
+ * methods are called whenever there is a new preview screenshot taken from
+ * the applications or when an application is exited.
+ *
+ * @see CHgFastSwapPreviewProvider
+ */
+class MHgFastSwapPreviewObserver
+    {
+public:
+
+    /**
+     * Called when application has changed and screenshot has been taken. 
+     * New sceenshots will be taken and provided to the client via this 
+     * callback every time the application goes to background.
+     *
+     * @param aWgId Window group id of the application.
+     * @param aFbsHandle Handle to screenshot CFbsBitmap.
+     */         
+    virtual void HandleFswPpApplicationChange( TInt aWgId, TInt aFbsHandle ) = 0;
+    
+    /**
+     * Called when application has been exited. Client can free the resources
+     * related to aWgId (for example a copied bitmap) since the application is
+     * no more running.
+     *
+     * @param aWgId Window group id of the application.
+     */         
+    virtual void HandleFswPpApplicationUnregistered( TInt aWgId ) = 0;    
+    };
+
+#endif // HGPREVIEWOBSERVER_H
+
+// End of file