--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/vtuis/videotelui/inc/commands/tvtuicmdvalidatorcallback.h	Mon Nov 23 14:47:47 2009 +0200
@@ -0,0 +1,89 @@
+/*
+* Copyright (c) 2007 Nokia Corporation and/or its subsidiary(-ies).
+* All rights reserved.
+* This component and the accompanying materials are made available
+* under the terms of "Eclipse Public License v1.0"
+* which accompanies this distribution, and is available
+* at the URL "http://www.eclipse.org/legal/epl-v10.html".
+*
+* Initial Contributors:
+* Nokia Corporation - initial contribution.
+*
+* Contributors:
+*
+* Description:  Command validator callback class definition.
+*
+*/
+
+
+#ifndef T_VTUICMDVALIDATORCALLBACK_H
+#define T_VTUICMDVALIDATORCALLBACK_H
+
+#include <e32base.h>
+
+/**
+ *  MVtUiCmdValidatorCallBack
+ *
+ *  Command validator callback API.
+ *
+ *  @since S60 v3.2
+ */
+class MVtUiCmdValidatorCallBack
+    {
+
+public:
+
+    /**
+     * Invokes callback call.
+     */
+    virtual TBool Call( TInt ) const = 0;
+
+    };
+
+/**
+ *  TVtUiCmdValidatorCallBack
+ *
+ *  Validator callback wrapper to maintain type safety. Also allows use of
+ *  different types of instances for invocation of callback.
+ *
+ *  @since S60 v3.2
+ */
+template < class T >
+NONSHARABLE_CLASS( TVtUiCmdValidatorCallBack )
+: public MVtUiCmdValidatorCallBack
+    {
+
+    // Callback method type definition
+    typedef TBool ( T::*TCallBackMethod )( TInt ) const;
+
+public:
+
+    /**
+     * Constructor
+     *
+     * @param aInstance Instance on which callback method will be called.
+     * @param aMethod Callback method to be called.
+     */
+    TVtUiCmdValidatorCallBack( const T& aInstance, TCallBackMethod aMethod );
+
+    /**
+     * Executes callback.
+     *
+     * @param aParameter Callback parameter, e.g. command Id or resource Id.
+     * @return Callback result.
+     */
+    TBool Call( TInt aParameter ) const;
+
+private:
+
+    // Instance from which callback method will be invoke
+    const T* iInstance;
+
+    // Callback method pointer
+    TCallBackMethod iMethod;
+
+    };
+
+#include "tvtuicmdvalidatorcallback.inl"
+
+#endif // T_VTUICMDVALIDATORCALLBACK_H