/*

* Copyright (c)  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:  CMmGridView declaration

*

*/

#ifndef C_MMGRIDVIEW_H

#define C_MMGRIDVIEW_H

#include <e32std.h>

#include <e32base.h>

#include <AknGridView.h> 

/**

 *  Multimedia Menu Grid View.

 *

 *  @code

 *  @endcode

 *  @lib mmwidgets

 *  @since S60 v3.0

 *  @ingroup group_mmwidgets

 */

NONSHARABLE_CLASS( CMmGridView ) : public CAknGridView

    {

public:

    /**

     * Two-phased constructor.

     * 

     * @since S60 v3.0

     */

    static CMmGridView* NewL();

    /**

     * Two-phased constructor.

     * 

     * @since S60 v3.0

     */

    static CMmGridView* NewLC();

    /**

     * Destructor.

     * 

     * @since S60 v3.0

     */

    virtual ~CMmGridView();

    /**

     * Draws the grid within the given clipping rectangle.

     *

     * @since S60 v3.0

     * @param aClipRect Clipping rectangle.

     */

	void Draw( const TRect* aClipRect ) const;

	/**

     * Gets item position.

     * 

     * This fuction from @c CAknGridView is overridden so that it

     * returns 'mirrored' item positions when mirrored layout is

     * used. 

     * 

     * @since S60 v3.0

     * @param aItemIndex Item index.

     * @return Item position.

     */

    TPoint ItemPos( TInt aItemIndex ) const;

    /**

     * Converts an (x, y) pixel position to an item index.

     * 

     * This fuction from @c CAknGridView has been overridden in order

     * to make it work properly when mirrored layout is used.

     * 

     * @param aPosition Pixel position in the viewing rectangle.

     * @param aItemIndex Reference to the item index.

     * @return Whether there was an item at aPosition.

     */  

    TBool XYPosToItemIndex(TPoint aPosition, TInt& aItemIndex) const;

	/**

	 * Returns this view's gc.

	 * 

	 * @return pointer to gc

	 */

	CWindowGc* Gc();

    /**

     * @see CAknGridView::UpdateSelectionL

     * 

     * This method of CAknGridView is overriden to so that

     * correct effects are displayed when moving highlight with 

     * rocker key in mirrored layout.

     * Please note that it is necessary because of the hackish

     * solution used to draw items in mirrored layout.

     */

    void UpdateSelectionL( TSelectionMode aSelectionMode );

	/**

	 * @see CAknGridView::MoveCursorL

	 * 

	 * This method of CAknGridView is overriden to so that

	 * correct effects are displayed when moving highlight with 

	 * rocker key in mirrored layout.

     * Please note that it is necessary because of the hackish

     * solution used to draw items in mirrored layout.

	 */

    void MoveCursorL( TCursorMovement aCursorMovement,

            TSelectionMode aSelectionMode );

    /**

     * Gets the current widget vertical item offset.

     * 

     * @since S60 v5.0

     * @return The current widget vertical item offset.

     */

    TInt VerticalItemOffset() const;

	/**

	* This function sets item height in pixels.

	* @param aItemHeight New height in pixels for this view’s items.

	*/	

    void SetItemHeight(TInt aItemHeight);

private:

    /**

     * Default constructor.

     * 

     * @since S60 v3.0 

     */

    CMmGridView();

    /**

     * 2nd phase constructor.

     * 

     * @since S60 v3.0 

     */

    void ConstructL();

    /**

     * Draws the grid within the given clipping rectangle.

     *

     * @since S60 v3.0

     * @param aClipRect Clipping rectangle.

     */

    void DoDraw( const TRect* aClipRect ) const;

    /**

     * Gets item position.

     * 

     * AVKON implementation of ItemPos method does not always work properly.

     * It fails when:

     *   aItemIndex < TopItemIndex() - NumberOfColsInView()

     * Because of that problem this method was created. It is now used in

     * CMmGridView::ItemPos in place where base class (AVKON) implementation

     * was used previously.

     * 

     * @param aItemIndex Item index.

     * @return Item position.

     */

    TPoint CorrectItemPos( TInt aItemIndex ) const;

private:

    /**

     * Stores cursor movement flag during CMmGridView::MoveCursorL execution.

     * 

     * When CMmGridView::MoveCursorL is not executing this member variable is

     * always set to ECursorFirstItem. This is part of the hack that allows

     * for correct effects to be displayed when using rocker key in mirrored

     * layout.

     */

    TCursorMovement iLastCurMove;

    /**

     * Stores previosly highlighted item index during CMmGridView::MoveCursorL

     * execution.

     * 

     * When CMmGridView::MoveCursorL is not executing this member variable is

     * always set to KErrNotFound. This is part of the hack that allows

     * for correct effects to be displayed when using rocker key in mirrored

     * layout.

     */

    TInt iOldIndex;	

    };

#endif // C_MMGRIDVIEW_H