/*

* Copyright (c) 2002-2006 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:  The event handler to handle events of list box in dialog.

*

*/

#ifndef C_AKNFILESELECTIONEVENTHANDLER_H

#define C_AKNFILESELECTIONEVENTHANDLER_H

// INCLUDES

#include <cstack.h>

#include <f32file.h>

#include "MAknCommonDialogsEventObserver.h"

#include "CAknCommonDialogsBase.h"

#include "MAknCFDFileSystemObserver.h"

// FORWARD DECLARATIONS

class MAknFileSelectionObserver;

class CAknFileSelectionModel;

class CAknCFDFileSystemEvent;

class CAknCommonDialogsPopupList;

// CLASS DEFINITION

/**

*  A class that handles events reported from an UI class in file selection.

*

*  @lib CommonDialogs.lib

*  @since 1.2

*/

NONSHARABLE_CLASS(CAknFileSelectionEventHandler) : public CBase, public MAknCommonDialogsEventObserver,

        public MAknCFDFileSystemObserver

    {

    public:     // Constructors and destructors

        /**

        * Static constructor.

        * @param aCoeEnv A pointer to control environment.

        * @param aModel A pointer to file selection model.

        * @param aDialogType Type of the dialog.

        * @param aObserver A reference to a pointer to an observer which is

        *        asked if the selected item can be selected.

        * @param aLeftSoftkeyFile Left softkey text when a file is focused.

        * @param aLeftSoftkeyFolder Left softkey text when a folder is focused.

        * @param aRightSoftkeyRootFolder Right softkey text when user browses

        *        in the root folder.

        * @param aRightSoftkeySubfolder Right softkey text when user browses

        *        in a subdirectory.

        * @return Returns a pointer to an instance of itself.

        */

        static CAknFileSelectionEventHandler* NewL(

            CCoeEnv* aCoeEnv,

            CAknFileSelectionModel* aModel,

            const TCommonDialogType& aDialogType,

            MAknFileSelectionObserver*& aObserver,

            const HBufC*& aLeftSoftkeyFile,

            const HBufC*& aLeftSoftkeyFolder,

            const HBufC*& aRightSoftkeyRootFolder,

            const HBufC*& aRightSoftkeySubfolder );

        ~CAknFileSelectionEventHandler();

    public:     // New methods

        /**

        * Pushes listbox indices to stack.

        * @param aTopIndex Index of the topmost item in the listbox window.

        * @param aFocus Index of the item focused.

        */

        void PushIndicesL( TInt aTopIndex, TInt aFocus );

        /**

        * Pops listbox indexes from stack. Sets values to 0 if stack is empty.

        * @param aTopIndex Index of the topmost item in the listbox window.

        * @param aFocus Index of the item focused.

        */

        void PopIndices( TInt& aTopIndex, TInt& aFocus );

        /**

        * Resets current softkeys to EFirstTime.

        */

        void ResetSoftkeyStatus();

        /**

        * Updates softkey texts if they need to be changed.

        * @param aCurrentItemIndex Index of the currently selected item.

        * @param aContainer A pointer to a button group container to update buttons.

        */

        void UpdateSoftkeysL( TInt aCurrentItemIndex, CEikButtonGroupContainer* aContainer );

    public:     // Functions from base classes

        /**

        * From MAknCommonDialogsEventObserver

        */

        TAction HandleEventL(

            TEvent aEvent,

            TInt& aFocusedItemIndex,

            TInt& aTopItemIndex,

            CEikButtonGroupContainer* aContainer );

        void StartFileSystemNotifierL(CAknCommonDialogsPopupList* aPopupList);

        void StopFileSystemNotifier();

        virtual void NotifyFileSystemChangedL();

    private:    // Enumerations

        /**

        * Enumerations for softkey statuses.

        * If softkey status has changed the text must be redrawn.

        */

        enum TSoftkeyStatus

            {

            EFirstTime = -1,

            ESKNotVisible,

            ESKFileFocused,

            ESKFolderFocused,

            ESKInRootFolder,

            ESKInSubfolder

            };

        /**

        * A small container class.

        */

        class TFocusItem

            {

            public:

                inline TFocusItem( TInt aTopIndex, TInt aFocus );

                TInt iTopIndex; // Index of the first item in listbox view.

                TInt iFocus; // Index of the focused item.

            };

    private:    // Constructors and destructors

        void ConstructL();

        /**

        * Constructor.

        * @param aCoeEnv A pointer to control environment.

        * @param aModel A pointer to file selection model.

        * @param aDialogType Type of the dialog.

        * @param aObserver A reference to a pointer to an observer which is

        *        asked if the selected item can be selected.

        * @param aLeftSoftkeyFile Left softkey text when a file is focused.

        * @param aLeftSoftkeyFolder Left softkey text when a folder is focused.

        * @param aRightSoftkeyRootFolder Right softkey text when user browses

        *        in the root folder.

        * @param aRightSoftkeySubfolder Right softkey text when user browses

        *        in a subdirectory.

        */

        CAknFileSelectionEventHandler(

            CCoeEnv* aCoeEnv,

            CAknFileSelectionModel* aModel,

            const TCommonDialogType& aType,

            MAknFileSelectionObserver*& aObserver,

            const HBufC*& aLeftSoftkeyFile,

            const HBufC*& aLeftSoftkeyFolder,

            const HBufC*& aRightSoftkeyRootFolder,

            const HBufC*& aRightSoftkeySubfolder );

    private:    // Data

        // Own: Left softkey status

        TSoftkeyStatus iCurrentLeftSoftkey;

        // Own Right softkey status.

        TSoftkeyStatus iCurrentRightSoftkey;

        // Own: Stack for listbox focuses.

        CStack<TFocusItem, ETrue> iStack;

        // Ref: Pointer to control environment

        CCoeEnv* iCoeEnv;

        // Ref: Pointer to file selection engine

        CAknFileSelectionModel* iModel;

        TEntry  iEntry;

        // Ref: Dialog type

        const TCommonDialogType& iDialogType;

        // Ref: File selection observer

        MAknFileSelectionObserver*& iObserver;

        // Ref: Softkey text

        const HBufC*& iLeftSoftkeyFile;

        // Ref: Softkey text

        const HBufC*& iLeftSoftkeyFolder;

        // Ref: Softkey text

        const HBufC*& iRightSoftkeyRootFolder;

        // Ref: Softkey text

        const HBufC*& iRightSoftkeySubfolder;

        CAknCFDFileSystemEvent* iFSObserver;

        CAknCommonDialogsPopupList* iPopupList;

    };

// Constructor for TFocusItem object

inline CAknFileSelectionEventHandler::TFocusItem::TFocusItem(

    TInt aTopIndex,

    TInt aFocus )

    :   iTopIndex( aTopIndex ),

        iFocus( aFocus )

    {

    }

#endif // C_AKNFILESELECTIONEVENTHANDLER_H