/*

* 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:  Taskswitcher Fast Swap area UI

 *

*/

#ifndef TSFASTSWAPGRID_H_

#define TSFASTSWAPGRID_H_

#include <AknGrid.h>

#include <aknconsts.h>

#include "tsdevicestate.h"

class CAknsFrameBackgroundControlContext;

/**

 * Observer for handling fast swap grid events

 */

class MTsFastSwapGridObserver

    {

public:

    /**

     * Called when close icon is tapped on the grid item.

     * 

     * @param  aItemIdx  index of the the item for which close icon

     *                   has been tapped

     */

    virtual void HandleCloseEventL( TInt aItemIdx ) = 0;

    };

/**

 * Avkon grid implementing custom item drawer

 */

class CTsFastSwapGrid: 

    public CAknGrid,

    public MTsDeviceStateObserver,

    public MTsFastSwapTimerObserver

    {

public: // enums

    enum TFastSwapGridBehaviour

        {

        // Highlight always visible

        EHybrid,

        // Touch only highlight handling

        ETouchOnly

        };

public: // Constructor and destructor

    CTsFastSwapGrid();

    ~CTsFastSwapGrid();

    void ConstructL( const CCoeControl* aParent );

public: // From CCoeControl

    void HandlePointerEventL( const TPointerEvent &aPointerEvent );

    void HandleResourceChange( TInt aType );

    void SizeChanged();

    void Draw( const TRect& aRect ) const;

public: //From MTsDeviceStateObserver

    /**

     * Called when a change, to which the observer is registered,

     * has happened.

     */

    virtual void HandleDeviceStateChanged( TChangeType aChangeType );

public: // New functions

    /**

     * Sets fast swap grid observer

     */

    void SetFastSwapGridObserver( MTsFastSwapGridObserver* aObserver  );

    /**

     * Set indexes of items which can be closed.

     * Copies item index array.

     */

    void SetCloseItemsL( RArray<TInt>& aItemIndex );

    /**

     * Checks if the item of given index is closable

     */

    TBool CanCloseItem( TInt aItemIndex );

    /**

     * Checks if the given item's close icon has been tapped.

     */

    TBool IsItemCloseHit( TInt aItemIndex );

    /**

     * Resets index of the item that has been close icon hit

     */

    void ResetCloseHit();

    /**

     * Sets color for the screenshot stroke.

     * 

     * @param  aColor  color for the thumbnail

     * @param  aHighlightedColor  color for thumbnail when item is highlighted

     */

    void SetStrokeColors( TRgb aColor, 

                          TRgb aHighlightedColor );

    /**

     * Sets items for which stroke will be drawn

     * 

     * @param  aItemIndex  array of item indexes for which stroke

     *                     is drawn

     */

    void SetStrokeItemsL( RArray<TInt>& aItemIndex );

    /**

     * Sets grid behaviour

     * 

     * @param  aBehaviour  behaviour to be set

     */

    void SetGridBehaviour( TFastSwapGridBehaviour aBehaviour );

    /**

     * Getter for grid behaviour

     * 

     * @return  girds behaviour

     */

    TFastSwapGridBehaviour GridBehaviour();

    /**

     * Shows highlight. In touch only behaviour highlight

     * will be shown only for ammount of time.

     */

    void ShowHighlight();

    /**

     * Hides highlight.

     */

    void HideHighlight();

    /**

     * Checks if the highlight is currently visible.

     * 

     * @return  ETrue  if highlight is visible

     *          EFalse if highlight is not visible

     */

    TBool IsHighlightVisible();

    /**

     * Sets visible view, items outside of view will not be drawn

     */

    void SetVisibleViewRect( const TRect aRect );

    /**

     * Returns visible view. Items outside of visible rectangle are not drawn.

     */

    TRect VisibleViewRect();

    /**

     * Updates layout data for item drawer. Should be called when

     * layout maybe out of date

     */

    void UpdateItemDrawerLayoutDataL();

    /**

     * Enables/disables avkon event handling.

     * 

     * @param  aEnable  if set to ETrue, pointer events will be forwarded

     *                  to CAknGrid base class if necessary. If set to EFalse,

     *                  no pointer events will be forwarded.

     */

    void EnableAknEventHandling( TBool aEnable );

private: // From CAknGrid

    virtual void CreateItemDrawerL();

private: // From MTsFastSwapTimerObserver

    void TimerCompletedL( CTsFastSwapTimer* aSource );

private: // New functions

    /**

     * Loads close icon bitmap and mask

     */

    void LoadCloseIconAndStrokeParams();

    /**

     * Redraws grid and parent controls

     */

    void Redraw();

private: // Data

    // Grid's parent

    const CCoeControl* iParent;

    // Close icon handling

    RArray<TInt> iCloseItems;

    TInt iCloseIconHitIdx;

    MTsFastSwapGridObserver* iFastSwapGridObserver;

    CTsFastSwapTimer* iCloseIconRedrawTimer;

    // Highlight handling

    TFastSwapGridBehaviour iBehaviour;

    TBool iHighlightVisible;

    // Visible view rectangle (horizontal scrolling support)

    TRect iVisibleViewRect;

    // Flag controlling input handling by grid

    TBool iAknEventHandlingEnabled;

    };

/**

 * Custom item drawer for drawing grid items

 */

class CTsGridItemDrawer: public CFormattedCellListBoxItemDrawer

    {

public: // Constructor and destructor

    CTsGridItemDrawer( CTsFastSwapGrid* aGrid,

                       CFormattedCellListBoxData* aData );

    ~CTsGridItemDrawer();

public: // New functions

    /**

     * Sets close icon drawn for items that can be closed.

     * Ownership transferred.

     */

    void SetCloseIcon( CFbsBitmap* aBmp, CFbsBitmap* aBmpMask,

                       CFbsBitmap* aBmpPressed, CFbsBitmap* aBmpPressedMask );

    /**

     * Initializes close icon rectangles.

     * 

     * @param  aButtonRect  rectangle for the button, coordinates must be relative to the grid item

     * @param  aIconRect    rectangle for the icon, coordinates must be relative to the grid item

     */

    void SetCloseIconRect( const TRect& aButtonRect, const TRect& aIconRect );

    /**

     * Returns current close icon coordinates for the given item rectangle

     * 

     * @param  aItemRect  rectangle of the item for which close button coordinates

     *                    are to be returned

     */

    TRect GetCloseButtonRect( const TRect& aItemRect ) const;

    /**

     * Sets screen offset for the item drawer to not draw items on the

     * grid edges

     */

    void SetEdgeOffset( TInt aLeftOffset, TInt aRightOffset );

    /**

     * Enables/Disables item drawer background redrawing

     * 

     * @param  aEnable  if set to ETrue, background will be redrawn by item drawer

     *                  if set to EFalse, background will not be redrawn

     */

    void SetRedrawBackground( TBool aEnable );

    /**

     * Sets color for the screenshot stroke.

     * 

     * @param  aColor  color for the thumbnail

     * @param  aHighlightedColor  color for thumbnail when item is highlighted

     */

    void SetStrokeColors( TRgb aNormalColor,

                          TRgb aHighlightedColor );

    /**

     * Sets items for which stroke will be drawn

     * 

     * @param  aItemIndex  array of item indexes for which stroke

     *                     is drawn.

     */

    void SetStrokeItemsL( RArray<TInt>& aItemIndex );

    /**

     * Sets stroke offset and size: values must be relative

     * to item rectangle.

     * 

     * @param  aStrokeOffset  offset of the stroke rectangle relative

     *                        to item rectangle

     * @param aStrokeSize     size of the stroke rectangle

     */

    void SetStrokeOffset( TPoint aStrokeOffset, TSize aStrokeSize );

    /**

     * Set screen rectangle, used by the item drawer to determine

     * drawn area.

     * 

     * @param  aRect  screen rectangle

     */

    void SetScreenRect( TRect aRect );

private: // From CFormattedCellListBoxItemDrawer

    void DrawActualItem( TInt aItemIndex, const TRect& aActualItemRect,

                         TBool aItemIsCurrent, TBool aViewIsEmphasized,

                         TBool aViewIsDimmed, TBool aItemIsSelected ) const;

private: // New functions

    /**

     * Checks if the item rectangle is visible in the view.

     * 

     * @param   aItemRect  rectangle of the item to be checked 

     * @return  ETrue      if rectangle is fully or partially visible

     *          EFalse     if rectangle is not visible

     */

    TBool IsItemRectVisible( const TRect& aItemRect ) const;

    /**

     * Checks if the aRectContained rectancle is contained by aRectContainig 

     * 

     * @param   aRectContained  rectangle that is suppose to be contained 

     * @param   aRectContainig  rectangle that is suppose to be containing 

     * @return  ETrue      if rectangle is fully contained 

     *          EFalse     if rectangle is not fully contained

     */

    TBool IsRectContained(const TRect& aRectContained,

            const TRect& aRectContainig) const;

    /**

     * Calculates current inner button rectangle for close icon

     */

    TRect CalculateInnerButtonRect( const TRect& aOuterRect ) const; 

private: // Data

    // Not owned

    CTsFastSwapGrid* iGrid;

    // Owned

    CFbsBitmap* iCloseIcon;

    CFbsBitmap* iCloseIconMask;

    CFbsBitmap* iCloseIconPressed;

    CFbsBitmap* iCloseIconPressedMask;

    TRect iScreenRect;

    TInt iLeftOffset;

    TInt iRightOffset;

    // Close button data

    TRect iCloseIconRect;

    TRect iCloseButtonRect;

    TBool iRedrawBackground;

    // Stroke data

    TRgb iStrokeColor;

    TRgb iHighlightStrokeColor;

    RArray<TInt> iStrokeItems;

    TRect iStrokeRect;

    };

#endif /* TSFASTSWAPGRID_H_ */