--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/backsteppingsrv/inc/bsengine.h	Thu Dec 17 08:54:17 2009 +0200
@@ -0,0 +1,154 @@
+/*
+* 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:  Engine for BS Engine
+ *
+*/
+
+
+#ifndef C_CBSENGINE_H
+#define C_CBSENGINE_H
+
+#include <e32base.h>
+
+class CBSConfiguration;
+class CBSApplicationInfo;
+class CEikonEnv;
+
+/**
+ * Engine for BS solution
+ * It is the place when whole BS logic is implemented.
+ *
+ *  @since S60 v3.2
+ */
+class CBSEngine : public CBase
+    {
+public:
+
+    static CBSEngine* NewL();
+    static CBSEngine* NewLC();
+
+    /**
+     * Destructor
+     */
+    virtual ~CBSEngine();
+
+    /*
+     * This method is notified when new application gain focus
+     * 
+     * @since S60 3.2
+     * @param aApp application UID
+     */
+    void HandleFocusChangeL( const TUid& aApp );
+
+    /**
+     * Invoked when activation event appeared
+     * appliction state changed or focus state changed
+     *
+     * @since S60 3.2
+     * @param aApp application UID
+     * @param aState state of application (like view ids)
+     * @param aFocused indicate if it was item/exit state
+     * @return EBSEngineCommandWasConsumed if event was consumed,
+     *  else EBSEngineCommandWasNotConsumed
+     */
+    TInt HandleActivationEventL( const TUid& aApp, const TDesC8& aState,
+        TBool aFocused );
+
+    /**
+     * Invoked when back event appeared
+     *
+     * @since S60 3.2
+     * @param aApp application UID
+     * @param aState state of application (like view ids)
+     * @param aCheckOnly indicates if only checking should be done (no actual action)
+     * @return EBSEngineCommandWasConsumed if event was consumed,
+     *  else EBSEngineCommandWasNotConsumed
+     */
+    TInt HandleBackEventL( const TUid& aApp, const TDesC8& aState,
+        TBool aCheckOnly );
+
+    /**
+     * Remove information about given application from BS stack
+     */
+    void RemoveAppRecord( const TUid& aApp );
+
+    /**
+     * Marks that application was pressed
+     */
+    void ApplicationKeyWasPressed();
+
+private:
+
+    CBSEngine();
+
+    void ConstructL();
+
+    /**
+     * Returns previous application in focus stack for given application.
+     *
+     * @since S60 3.2
+     * @param aApp application UID
+     * @return UID of previous application, 
+     * if information is missing returns TUid::Null
+     */
+    TUid FindPreviousApp( const TUid& aApp );
+
+    /**
+     * Sends given appliction to background
+     * @since S60 3.2
+     * @param aApp application UID
+     */
+    void SendToBackground( const TUid& aApp );
+    /**
+     * Resets BS history
+     */
+    void ResetHistory();
+
+private:
+    // data
+
+    /**
+     * list of application in BS stact
+     */
+    RPointerArray<CBSApplicationInfo> iAppsStack;
+
+    /**
+     * focus stack
+     */
+    RArray<TInt> iFocusHistory;
+
+    /**
+     * flag for handling fast swap events
+     */
+    TBool swap;
+
+    /**
+     * flag for application key state
+     */
+    TBool wasPressed;
+
+    /**
+     * Configuration of BS
+     * Own.  
+     */
+    CBSConfiguration* iConfiguration;
+
+    /**
+     * Eikon environment
+     * Not own.  
+     */
+    CEikonEnv* iEnv;
+    };
+
+#endif // C_CBSENGINE_H