/*

* Copyright (c) 2009 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:   ?Description

*

*/

#ifndef STATEHANDLER_H

#define STATEHANDLER_H

#include <QObject>

#include <QList>

#include <glxbasestate.h>

class GlxState;

class GlxViewManager;

class GlxMediaModel;

class GlxAlbumModel;

class QAbstractItemModel;

class GlxActionHandler;

#ifdef BUILD_STATEMANAGER

#define GLX_STATEMANAGER_EXPORT Q_DECL_EXPORT

#else

#define GLX_STATEMANAGER_EXPORT Q_DECL_IMPORT

#endif

class GLX_STATEMANAGER_EXPORT GlxStateManager : public QObject

{

    Q_OBJECT

	friend class TestGlxStateManager;

public :

    GlxStateManager();

    virtual ~GlxStateManager();

    void launchFromExternal();

    void cleanupExternal();

    //internal exposed function

    void enterMarkingMode();

    void exitMarkingMode();

    bool executeCommand(qint32 commandId);

signals :    

    void externalCommand(int cmdId);

    void setupItemsSignal();

public slots:

    void launchApplication();

    void actionTriggered(qint32 id);

    void setupItems();

public :

/*

 * It will create a new state and replace the current state with new state in the stack.

 * It will use in the case of state switching.

 * use -1 if state does not have internal state

 */    

    void changeState(qint32 newStateId, int internalState );

/*

 * Go back to previous state 

 */    

    void previousState();

/*

 * Go back to a state in hierarchy and pop all the state upto that level.

 * if state is not found, then all the state from the hierachy is removed and create a new state on level 0

 * This function will be use in the case when more then one back is required in single event.

 */

    void goBack(qint32 stateId, int internalState);

/*

 * Create a new state and current state should be pushed into stack.

 * use -1 if state does not have internal state

 */  

    void nextState(qint32 newStateId, int internalState );

/*

 * It will delete the current model

 */      

    void removeCurrentModel();

private:

/*

 * Factory function to create the state.

 */  

    GlxState * createState(qint32 state);

/*

 * Factory function to create the model.

 */  	

    void createModel(qint32 stateId, NavigationDir dir = NO_DIR);

/*

 * Factory function to create the grid model.

 */  	

    void createGridModel(int internalState, NavigationDir dir = NO_DIR);

    void eventHandler(qint32 &id);

/*

 * A function to care the exit for application, in the case when application launch from internal and external

 */        

    void exitApplication();

private:

    GlxViewManager      *mViewManager;

    GlxMediaModel       *mAllMediaModel;        // for all grid

    GlxMediaModel       *mAlbumGridMediaModel;  // for album grid 

    GlxAlbumModel       *mAlbumMediaModel;      // for album list

	GlxMediaModel       *mImageviewerMediaModel;// for image viewer 

    QAbstractItemModel  *mCurrentModel;         // no owner ship

    GlxState            *mCurrentState;		

    GlxActionHandler    *mActionHandler;

    int                 mCollectionId;

};

#endif /* STATEHANDLER_H_ */