/*

* 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;

class GlxTNObserver;

#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 :

    /*

     * Constructor

     */

    GlxStateManager();

    /*

     * Destructor

     */

    virtual ~GlxStateManager();

    /*

     * Fuction to launch the application from some external world

     */

    void launchFromExternal();

    /*

     * Clean the all externel data

     */

    void cleanupExternal();

    /*

     *  Move the views to the multiple item selection state

     */

    void enterMarkingMode();

    /*

     * Exit from the multiselection state

     */

    void exitMarkingMode();

    /*

     * Execute the commant on multiple selected item

     */

    bool executeCommand(qint32 commandId);

    /*

     *  when application goes into background or come back to foreground

     *  set and reset the background thumbnail generation property

     */

    bool eventFilter(QObject *obj, QEvent *ev);    

signals :

    /*

     * Send the user activities ( command ) to the external world

     */

    void externalCommand(int cmdId);

    /*

     * TO send the signal to initialise the rest of items

     * which is not created in the launch sequence

     */

    void setupItemsSignal();

public slots:

    /*

     * To launch the application

     */

    void launchApplication();

    /*

     * To handle the user action, view switching etc

     */

    void actionTriggered(qint32 id);

    /*

     * To create the items which is not created in the aluch sequence

     */

    void setupItems();

    /*

     * call back function to monitor the change in thumbnail manager

     */

    void updateTNProgress( int count);

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();

    /*

     * It will delete the all model used by state manager

     */

    void cleanAllModel();

private:

    /*

     *  Launch the harvesting and TN generation progress bar dialog

     */

    void launchProgressDialog();

    /*

     * remove the harvesting and TN generation progress bar dialog

     */

    void vanishProgressDialog();

    /*

     * 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);

    /*

     * To set the fullscreen context based on the currrent orientation

     */    

    void setFullScreenContext();

    /*

     * Apllication event handler function

     */

    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;

    GlxTNObserver       *mTNObserver;

    int                 mCollectionId;

    bool                isProgressbarRunning;

};

#endif /* STATEHANDLER_H_ */