/*

* Copyright (c) 2002-2004 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:  

*     This is a concrete class for the handling of a grid. The class handles a

*     rectangular grid arrangement of items held in any linear ordering i.e 

*     cells ordered top to bottom and left, left to right and down etc.

*

*

*/

#if !defined(__AKNGRID_H__)

#define __AKNGRID_H__

// INCLUDES

#include <eiktxlbx.h>

#include <eiklbv.h>

#include <eikfrlbd.h>

#include <eikfrlb.h>

#include <AknGridM.h>

#include <AknGridView.h>

#include <aknappui.h>

// CLASS PREDEFINITIONS

class CAknGridExtension;

// CLASS DECLARATION

/**

*  Application grid handling class from Avkon.

*  Provides support for ordering application grids items.

*

*  @since Series 60 0.9

*/

class CAknGrid : public CEikListBox

    {

private:// enums

    enum TIndicatorEvent

        {

        EMove,

        EChangeNumOfItems,

        EResize

        };

public:

    /**

    * Base class default constructor.

    * @return A pointer to a new @c CAknGrid object.

    */

    IMPORT_C CAknGrid();

    /**

    * Destructor.

    */

    IMPORT_C virtual ~CAknGrid();

    /**

    * This function gives @c CAknGridM class pointer to @c CAknGrid class. 

    * Usually, the @c CAknGridM class object is instantiated automatically 

    * during the construction phase of the @c CAknGrid object. If an 

    * application programmer provides their own grid model class, the 

    * application programmer must instantiate their own grid model class object

    * and give it to the @c CAknGrid object using the @c SetModel function 

    * before calling the @c ConstructL/ConstructFromResourceL function.

    * @param aModel Pointer to @c CAknGridM class.

    */  

    IMPORT_C void SetModel(CAknGridM* aModel);

    /**

    * This is Symbian default constructor. The @c ConstructL function needs to

    * be called in case resource data is not used. If a leave occurs the 

    * framework generates a Symbian Leave code.

    * @param aPatent A CCoeControl pointer.

    * @param aFlags Parameter for @c CEikListBox constructor. If the 

    * parameter is missing default value is 0.

    */  

    IMPORT_C void ConstructL(const CCoeControl* aParent, TInt aFlags = 0);

    /**

    * The @c ConstructFromResourceL function needs to be called in case 

    * resource data is used. Usually, the @c CAknGridM class object is 

    * instantiated automatically during the construction phase of the 

    * @c CAknGrid object. If an application programmer provides their own grid

    * model class, the application programmer must instantiate their own grid 

    * model class object and give it to the @c CAknGrid object using the 

    * @c SetModel function before calling the 

    * @c ConstructL/ConstructFromResourceL function. If a leave occurs the 

    * framework generates a Symbian Leave code.

    * @param aReader Construct controls from resource file.

    */

    IMPORT_C void ConstructFromResourceL(TResourceReader& aReader);

    /**

    * Sets the orientation of the grid, either vertical or horizontal, the

    * ordering of the data and the size of the primary dimension of the

    * grid. The value for the parameter @c aNumOfItemsInPrimaryOrient must be

    * greater than zero since this determines the number of items (be it rows

    * or columns) in the primary orientation of the grid. If a leave occurs

    * the framework generates a Symbian Leave code.

    * @param aVerticalOrientation Items vertical orientation.

    * @param aLeftToRight @c ETrue left to right.

    * @param aTopToBottom @c ETrue top to bottom.

    * @param aNumOfItemsInPrimaryOrient Number of items in primary orient.  

    * @param aNumOfItemsInSecondaryOrient Number of items in Secondary orient.

    * @param aSizeOfItems Item size.

    * @param aWidthOfSpaceBetweenItems =0 Width of space between items.

    * @param aHeightOfSpaceBetweenItems =0 Height of space between items.

    */

    IMPORT_C void SetLayoutL(TBool aVerticalOrientation,

                             TBool aLeftToRight,

                             TBool aTopToBottom,

                             TInt aNumOfItemsInPrimaryOrient,

                             TInt aNumOfItemsInSecondaryOrient,

                             TSize aSizeOfItems,

                             TInt aWidthOfSpaceBetweenItems=0,

                             TInt aHeightOfSpaceBetweenItems=0);

    /**

    * Sets the layout from a resource. Layout includes orientation (either

    * vertical or horizontal), horizontal and vertical direction of numbering,

    * the number of items in the primary and secondary orientation, and the 

    * primary and secondary scrolling types. If a leave occurs the framework 

    * generates a Symbian Leave code.

    * @param aReader Constructs controls from a resource file. 

    */

    IMPORT_C void SetLayoutFromResourceL(TResourceReader& aReader);

    /**

    * Sets the movement of the cursor with respect to scrolling when the

    * end item in the current row or column, whichever is the primary

    * orientation of the data items, is encountered. The movement maybe

    * either stop, loop back to same row or column or move onto the

    * next logical data item in the sequence.

    * @param aScrollingType Items scrolling type enum definition.

    */

    IMPORT_C void SetPrimaryScrollingType(CAknGridView::TScrollingType aScrollingType);

    /** 

    * Sets the movement of the cursor with respect to scrolling when the

    * end item in the secondary dimension of the grid is encountered.

    * The movement maybe either stop, loop back back to same row or column

    * or move onto the next logical data item in the sequence.

    * @param aSecondaryScrolling Secondary scrolling type enum definition.

    */

    IMPORT_C void SetSecondaryScrollingType(CAknGridView::TScrollingType aSecondaryScrolling);

    /**

    * Sets the starting position of the data within the grid. A blank page 

    * cannot be accessed (since cannot move into empty cells) so  a totally 

    * blank page is the same as if the page never existed since the user 

    * cannot scroll into it. For this reason it is suggested that the start

    * position be no more than one page into the grid. If a leave occurs 

    * the framework generates a Symbian Leave code.

    * @param aGridStartPosition Parameter manipulate the grid's starting 

    * position.

    */

    IMPORT_C void SetStartPositionL(TPoint aGridStartPosition);

    /**

    * @c CurrentDataIndex retrieves the index of the selection. In grids, you 

    * should use this method instead of @c CEikListBox::CurrentItemIndex(), 

    * when you are manipulating data stored in the grid's @c ItemTextArray. 

    * While @c CurrentItemIndex() returns the same value as 

    * @c CurrentItemIndex() on most phones, there will be difference in some 

    * language variants where text reading/writing direction is different from 

    * left-to-right.

    * @return A current position of highlight.

    */

    IMPORT_C TInt CurrentDataIndex() const;

    /**

    * Moves the cursor to the required grid data index.

    * @param aDataIndex Data index value.

    */

    IMPORT_C void SetCurrentDataIndex(TInt aDataIndex);

    /**

    * The grid position function. Gives the data index by using grid's 

    * position. The position must be given from the top left corner. If 

    * the function returns -1 the item's position is invalid.

    * @param aGridPosition The data item's co-ordinate values. 

    * @return Activated item's index value.

    */

    IMPORT_C TInt IndexOfPosition(TPoint aGridPosition) const;

    /**

    * The grid position function. Gives the data item's co-ordinate values 

    * by using item's index value.

    * @param aItemIndex The data item's index value.   

    * @return @c TPoint co-ordinate values of active item.

    */

    IMPORT_C TPoint PositionAtIndex(TInt aItemIndex) const;

    /**

    * Item drawer. Gets the pointer to the grid class.

    * @return A pointer to @c CFormattedCellListBoxItemDrawer object.

    */

    IMPORT_C CFormattedCellListBoxItemDrawer* ItemDrawer() const;

    /**

    * Function sets a grid text to the data item. If a leave occurs the 

    * framework generates a Symbian Leave code.

    * @since Series S60 3.0

    * @param aText Descriptor parameter.

    */

    IMPORT_C void SetEmptyGridTextL(const TDesC& aText);

    /**

    * This function sets the empty grid text.

    * @return A pointer to the grid text descriptor.

    */

    inline const TDesC* EmptyGridText() const;

public:

    /**

    * This function creates a new object and returns pointer to it. If the 

    * leave occurs the framework generates a Symbian Leave code.

    * @return A pointer to @c CListBoxView class.

    */

    IMPORT_C virtual CListBoxView* MakeViewClassInstanceL();

    /**

    * This function sets the column width of the grid. Column width cannot be 

    * set in a horizontal grid since the number of columns in the grid is 

    * defined by the initialising call to @c SetLayoutL. The column width 

    * cannot be larger than the width of the viewing rectangle.

    * @param aColumnWidth A parameter defines a width of the column.

    */

    IMPORT_C void SetColumnWidth(TInt aColumnWidth);

    /**

    * This function gives a width of the column.

    * @return A width of the column. 

    */

    IMPORT_C TInt ColumnWidth() const;

public: //from CEikListBox

    /**

    * This function updates the scrollbars, including item position. This 

    * function is called when the size of the scrollbars or data changes. If 

    * the leave occurs the framework generates a Symbian Leave code.

    */

    IMPORT_C virtual void UpdateScrollBarsL();

    /**

    * This function should be called after one or more items have been added to

    * the grid. If a leave occurs the framework generates a Symbian Leave 

    * code.

    */  

    IMPORT_C void HandleItemAdditionL();

    /**

    * This function should be called after one or more items have been removed 

    * from the grid. If a leave occurs the framework generates a Symbian 

    * Leave code.

    */  

    IMPORT_C void HandleItemRemovalL();

    /**

    * This function is from @c CEikAppUi, handles key events. If a leave 

    * occurs the framework generates a Symbian Leave code.

    * @param aKeyEvent Event to handled.

    * @param aType of the key event.

    * @return Response code ( @c EKeyWasConsumed, @c EKeyWasNotConsumed )

    */  

    IMPORT_C virtual TKeyResponse OfferKeyEventL(const TKeyEvent& aKeyEvent,TEventCode aType);

    /**

    * This function sets the row height of the grid. Row height cannot be set

    * in a vertical grid since the number of rows in the grid is defined by 

    * the initialising call to @c SetLayoutL. The row height cannot be larger 

    * than the height of the viewing rectangle. If a leave occurs the 

    * framework generates a Symbian Leave code. 

    * @param aHeight The height of the item's rows.

    */  

    IMPORT_C void SetItemHeightL(TInt aHeight);

    /**

    * This function handles size changes. This routine assumes that 

    * @c SetLayoutL has been called to set up the grid.

    */  

    IMPORT_C void SizeChanged();

    /**

    * This function creates a new object and returns pointer to 

    * @c CTextListBoxModel class.

    * @return A pointer to @c CTextListBoxModel object.

    */  

    IMPORT_C CTextListBoxModel* Model() const;

    /**

    * This function handles viewable rectangle.

    * @param aRect Rectangle parameter. 

    */  

    IMPORT_C void SetRect(const TRect& aRect);

    /**

    * This function is called when the grid's items, item's data and scroll 

    * bars has been changed. This implementation ensures that the current 

    * item is visible after resize. If a leave occurs the framework generates

    * a Symbian Leave code.

    */  

    IMPORT_C virtual void HandleViewRectSizeChangeL();

    /**

    * This function sets top item index.

    * @param aItemIndex Item index value.

    */  

    IMPORT_C virtual void SetTopItemIndex(TInt aItemIndex) const;

    /**

    * This function handles resource changes.

    * @since Series S60 2.6.

    * @param aType Message type.

    */  

    IMPORT_C virtual void HandleResourceChange(TInt aType);

    /**

    * Indicates whether the control should be redrawn now. If @c ENoDrawNow, 

    * the function has no immediately effect. EDrawNow redraw control 

    * immediately.

    * @since Series S60 3.0.

    */

    IMPORT_C void FocusChanged(TDrawNow aDrawNow);

public: // From CCoeControl

    IMPORT_C void HandlePointerEventL(const TPointerEvent& aPointerEvent);

protected: // from CEikListBox

    /**

    * This function scroll horizontal by one column when the left/right scroll

    * arrows (i.e. the nudge buttons) are tapped.

    * @return A nudge value when the buttons are pressed.

    */

    IMPORT_C virtual TInt HorizontalNudgeValue() const;

    /**

    * This function gets the granularity for horizontal scrolls. The 

    * granularity is the minimum size of a horizontal move of the client area.

    * @return A grain size for horizontal scrolling in pixels. 

    */  

    IMPORT_C virtual TInt HorizScrollGranularityInPixels() const;

    /**

    * This function called by various functions of this class to ensure that

    * the top item index is always a sane value. The implementation in 

    * @c CEikListBox tries to ensure the minimum amount of white space at the 

    * bottom of the list box. Note that this function does not affect the 

    * current item index.

    */  

    IMPORT_C virtual void AdjustTopItemIndex() const;

    /** 

    * This function handles drag events. If a leave occurs the framework 

    * generates a Symbian Leave code.

    * @param aPointerPos The position of the @c TPointerEvent for which this 

    * handler is invoked.

    */

    IMPORT_C virtual void HandleDragEventL(TPoint aPointerPos);

    /** 

    * This function calculates the client area. This method is called by 

    * various functions of this class to recalculate the extent of the client

    * area from @c iViewRect. This implementation takes into account any 

    * rounding of the viewing rectangle made to fit a whole number of items.

    * @param aClientRect On return contains a size for the client area in 

    * pixels. 

    */

    IMPORT_C virtual void RestoreClientRectFromViewRect(TRect& aClientRect) const;

    /** 

    * This function rounds down the height of the rectangle (if necessary) so 

    * that only a whole number of items can be displayed inside the list box.

    * @param aRect Rectangle parameter.

    */

    IMPORT_C virtual TInt AdjustRectHeightToWholeNumberOfItems(TRect& aRect) const;

    /**

    * Updates the position of grids scroll bars’ thumbs to reflect the vertical 

    * position of selector.

    */

    IMPORT_C virtual void UpdateScrollBarThumbs() const;

    /**

    * Gets a count of the component controls of this grid.

    * @return The number of component controls.

    */

    IMPORT_C virtual TInt CountComponentControls() const;

protected:

    /**

    * Moves to the next or previous item on the grid. If a leave occurs the 

    * framework generates a Symbian Leave code.

    * @param aPoint Co-ordinate object parameter.

    */

    IMPORT_C void MoveToNextOrPreviousItemL(TPoint aPoint);

    /** 

    * This protected function used by functions to check/alter the dimensions

    * of the grid as data items are added or removed or the size of the items

    * are altered. It also assumes that @c SetLayoutL has been called. 

    * This will not leave if scrollbars have both been turned off. If a leave 

    * occurs the framework generates a Symbian Leave code.

    */

    IMPORT_C virtual void CalcGridSizeL();

    /**

    * Creates a formatted list item drawer. If a leave occurs the framework 

    * generates a Symbian Leave code.

    */

    IMPORT_C virtual void CreateItemDrawerL();

private:

    __DECLARE_TEST;

    // grid model helper

    inline CAknGridM* GridModel() const;

    // grid view helper

    inline CAknGridView* GridView() const;

    /**

    * This function sets the size and initial layout of items. If a leave 

    * occurs the framework generates a Symbian Leave code.

    * @param aOrientation

    * @param aHorizontal

    * @param aVertical

    * @param aNumOfItemsInPrimaryOrient

    * @param aNumOfItemsInSecondaryOrient

    * @param aSizeOfItems

    * @param aWidthOfSpaceBetweenItems

    * @param aHeightOfSpaceBetweenItems

    */

    void DoSetLayoutL(TInt aOrientation,

                      TInt aHorizontal,

                      TInt aVertical,

                      TInt aNumOfItemsInPrimaryOrient,

                      TInt aNumOfItemsInSecondaryOrient,

                      TSize aSizeOfItems,

                      TInt aWidthOfSpaceBetweenItems=0,

                      TInt aHeightOfSpaceBetweenItems=0);

private:

    /**

    * From CAknControl

    */

    IMPORT_C void* ExtensionInterface( TUid aInterface );

private: // from MListBoxModel

    IMPORT_C virtual TAny* MListBoxModel_Reserved();

protected: 

    /**

    * From @c MEikScrollBarObserver

    *

    * This function handles scroll events caused by scroll bar. 

    * It updates grid's view by event and new thumb position. 

    *

    * @param aScrollBar pointer to scroll bar sent this event

    * @param aEventType type of event

    */

    IMPORT_C virtual void HandleScrollEventL(CEikScrollBar* aScrollBar, TEikScrollEvent aEventType);

    /**

    * From @c MObjectProvider.

    *

    * Retrieves an object of the same type as that encapsulated in aId. This 

    * function is used to allow controls to ask their owners for access to 

    * other objects that they own.

    * 

    * @param aId An encapsulated object type ID.

    * @return Encapsulates the pointer to the object provided. 

    *         Note that the encapsulated pointer may be NULL.

    */

    IMPORT_C virtual TTypeUid::Ptr MopSupplyObject(TTypeUid aId);

private:

    TInt  iMinColWidth;

    TBool iCurrentIsValid;

    TInt  iNumOfColsInView;

    TInt  iNumOfRowsInView;

    TSize iSpaceBetweenItems;

        TInt  iSpare; // was iNumOfItemsInPrimaryOrient;

    TBitFlags iOrientationFlags;

    TBitFlags iHorizontalFlags;

    TBitFlags iVerticalFlags;

    CAknGridExtension *iExtension; // spare taken to use as extension class

    };

/**

 * Return Model

 */

inline CAknGridM* CAknGrid::GridModel() const

    {

    return STATIC_CAST(CAknGridM*,iModel);

    }

/**

 * Return View 

 */

inline CAknGridView* CAknGrid::GridView() const

    {

    return STATIC_CAST(CAknGridView*,iView);

    }

/**

 * Return text currently in the empty grid text

 */

inline const TDesC* CAknGrid::EmptyGridText() const

    {

    return STATIC_CAST(CAknGridView*,iView)->EmptyListText();

    }