/*

* 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:     

*

*/

// INCLUDE FILES

#include <ganes/HgGrid.h>

#include <ganes/HgItem.h>

#include "HgLayoutData.h"

#include "HgIndicatorManager.h"

#include "HgDrawUtils.h"

#include <aknphysics.h>

#include "HgConstants.h"

#include <AknIconUtils.h>

#include <avkon.mbg>

#include <AknUtils.h>

#include <AknsUtils.h>

#include <AknsDrawUtils.h>

#include <AknsConstants.h>

#include <gulicon.h>

#include <AknUtils.h>

#include <layoutmetadata.cdl.h>

#include <aknlayoutscalable_apps.cdl.h>

#include <aknlayoutscalable_avkon.cdl.h>

using namespace AknLayoutScalable_Apps;

// ============================ MEMBER FUNCTIONS ===============================

// -----------------------------------------------------------------------------

// CHgGrid::NewL()

// Two-phased constructor.

// -----------------------------------------------------------------------------

//

EXPORT_C CHgGrid* CHgGrid::NewL ( 

        const TRect& aRect, 

        TInt aItemCount, 

        CGulIcon* aDefaultIcon,

        RWsSession* aSession ) 

    {

    CHgGrid* self = new ( ELeave ) CHgGrid( 

            aItemCount, 

            aDefaultIcon);

    CleanupStack::PushL (self );

    self->ConstructL( aRect, aSession );

    CleanupStack::Pop (self );

    return self;

    }

// -----------------------------------------------------------------------------

// CHgGrid::ConstructL()

// Symbian 2nd phase constructor can leave.

// -----------------------------------------------------------------------------

//

void CHgGrid::ConstructL (const TRect& aRect, RWsSession* aSession )

    {

    TAknLayoutScalableParameterLimits limits = cell_gallery2_pane_ParamLimits(0);

    TInt cols = limits.LastColumn() + 1;

    iLayoutData = CHgGridLayoutData::NewL( cols );

    CHgScroller::ConstructL( aRect, aSession );

    // Activate the window, which makes it ready to be drawn

    ActivateL ( );

    }

// -----------------------------------------------------------------------------

// CHgGrid::CHgGrid()

// C++ default constructor can NOT contain any code, that might leave.

// -----------------------------------------------------------------------------

//

CHgGrid::CHgGrid( 

        TInt aItemCount, 

        CGulIcon* aDefaultIcon )

    {

    // No implementation required

    }

// -----------------------------------------------------------------------------

// CHgGrid::~CHgGrid()

// Destructor.

// -----------------------------------------------------------------------------

//

EXPORT_C CHgGrid::~CHgGrid ( )

    {

    delete iLayoutData;

    }

// -----------------------------------------------------------------------------

// CHgGrid::PreferredImageSize()

// -----------------------------------------------------------------------------

//

EXPORT_C TSize CHgGrid::PreferredImageSize()

    {

    TAknLayoutRect gridAppPane;

    TAknLayoutRect gridItem;

    TAknLayoutRect gridImage;

    gridAppPane.LayoutRect( TRect(), grid_gallery2_pane(0)); 

    gridItem.LayoutRect( gridAppPane.Rect(), cell_gallery2_pane(1, 0, 0));

    gridImage.LayoutRect(gridItem.Rect(), cell_gallery2_pane_g2(1));

    return gridImage.Rect().Size();

    }

// -----------------------------------------------------------------------------

// CHgGrid::InitItemsL()

// -----------------------------------------------------------------------------

//

void CHgGrid::InitItemsL()

    {

    for(TInt i = 0; i < iItemCount; ++i)

        {

        iItems.Append( CHgItem::NewL() );

        }

    }

// -----------------------------------------------------------------------------

// CHgGrid::DoDraw()

// -----------------------------------------------------------------------------

//

void CHgGrid::DoDraw (const TRect& /*aRect*/) const

    {

    // Get the standard graphics context

    TInt xdiff = (iViewPosition.iX-(iWidth/2))% (iLandscapeScrolling ? iRowHeight : iRowWidth);

    TInt ydiff = (iViewPosition.iY-(iHeight/2))%( iLandscapeScrolling ? iRowWidth : iRowHeight);

    if( iItemCount == 0 )

        {

        TRgb color( KRgbBlack );

        if ( AknsUtils::AvkonSkinEnabled() )

            {

            AknsUtils::GetCachedColor( AknsUtils::SkinInstance(),

                                          color,

                                          KAknsIIDQsnTextColors,

                                          EAknsCIQsnTextColorsCG6 );

            }

        if( iEmptyText )

            iDrawUtils->DrawEmptyText(SystemGc(), Rect(), *iEmptyText, color);

        }

    else

        {

        TAknLayoutRect gridAppPane;

        gridAppPane.LayoutRect( GridRect(), iLayoutData->ItemLayout() ); 

        if( iLandscapeScrolling )

            {

            if( AknLayoutUtils::LayoutMirrored() )

                {

                for(TInt i = iCurrentRow; i < iCols; ++i)

                    {

                    TInt xPos = - (((i-iCurrentRow)*iRowHeight) - xdiff); 

                    if( i < 0 )

                        continue;

                    else if( xPos  < -iWidth )

                        break;

                    DrawRows( i, gridAppPane.Rect(), xPos );

                    }                        

                }

            else

                {

                for(TInt i = iCurrentRow; i < iCols; ++i)

                    {

                    TInt xPos = ((i-iCurrentRow)*iRowHeight) - xdiff; 

                    if( i < 0 )

                        continue;

                    else if( xPos > iWidth )

                        break;

                    DrawRows( i, gridAppPane.Rect(), xPos );

                    }                        

                }

            }

        else

            {

            for(TInt i = iCurrentRow; i < iRows; ++i)

                {

                TInt yPos = ((i-iCurrentRow)*iRowHeight) - ydiff; 

                if( i < 0 )

                    continue;

                else if( yPos > iHeight )

                    break;

                DrawCols( i, gridAppPane.Rect(), yPos );

                }            

            }

        }

    }

// -----------------------------------------------------------------------------

// CHgGrid::DrawRows()

// -----------------------------------------------------------------------------

//

void CHgGrid::DrawRows( TInt aCol, const TRect& aRect, TInt aXPos ) const

    {

    for(TInt j = 0; j < iRows; ++j)

        {

        TInt index = aCol*iRows + j;

        if( index < iItems.Count())

            {

            TAknLayoutRect gridItem;

            gridItem.LayoutRect( aRect,iLayoutData->ColumnLayout(j) );

            TRect rect(gridItem.Rect());

            rect.Move( aXPos, 0 );

            DrawItem( index, rect );

            }

        else

            {

            break;

            }

        }

    }

// -----------------------------------------------------------------------------

// CHgGrid::DrawCols()

// -----------------------------------------------------------------------------

//

void CHgGrid::DrawCols(TInt aRow, const TRect& aRect, TInt aYPos) const

    {

    for(TInt j = 0; j < iCols; ++j)

        {

        TInt index = aRow*iCols + j;

        if( index < iItems.Count())

            {

            TAknLayoutRect gridItem;

            gridItem.LayoutRect( aRect,iLayoutData->ColumnLayout(j) );

            TRect rect(gridItem.Rect());

            rect.Move( 0, aYPos );

            DrawItem( index, rect );

            }

        else

            {

            break;

            }

        }

    }

// -----------------------------------------------------------------------------

// CHgGrid::DoDraw()

// -----------------------------------------------------------------------------

//

void CHgGrid::DrawItem(TInt aIndex, const TRect& aRect ) const

    {

    CHgItem* item = iItems[aIndex];

    CGulIcon* icon = item->Icon() ? item->Icon() : iDefaultIcon;

    if( aIndex == iSelectedIndex )

        {

        DrawHighlight(aRect);

        }

    CWindowGc& gc = SystemGc();

    iDrawUtils->DrawImage(gc, aRect, iLayoutData->IconLayout(), *icon);

    // Draw the indicators.

    iIndicatorManager->DrawIndicators(

            gc,

            aRect, 

            item->Flags(), 

            iLayoutData->FirstIndicatorLayout(), 

            iLayoutData->SecondIndicatorLayout() );            

    }

// -----------------------------------------------------------------------------

// CHgGrid::HandleSizeChanged()

// -----------------------------------------------------------------------------

//

void CHgGrid::HandleSizeChanged ( )

    {    

    iLandscapeScrolling = Layout_Meta_Data::IsLandscapeOrientation() && iLandScapeScrollingSupported;

    TInt oldCount = iLandscapeScrolling ? iRows : iCols;

    CalculateSizes();

    if( iLandscapeScrolling )

        {

        iCols = iItemCount / iRows;

        if(iItemCount%iRows)

            {

            ++iCols; // partially filled col

            }        

        iItemsOnScreen = iWidth / iRowHeight;

        if((iWidth % iRowHeight))

            iItemsOnScreen += 2;

        else

            iItemsOnScreen++;

        iItemsOnScreen *= iRows;

        if( oldCount != iRows )

            {

            FitTopItemToView( iCurrentRow*oldCount );        

            }                

        }

    else

        {

        iRows = iItemCount / iCols;

        if(iItemCount%iCols)

            {

            ++iRows; // partially filled row

            }        

        iItemsOnScreen = iHeight / iRowHeight;

        if((iHeight % iRowHeight))

            iItemsOnScreen += 2;

        else

            iItemsOnScreen++;

        iItemsOnScreen *= iCols;

        if( oldCount != iCols )

            {

            FitTopItemToView( iCurrentRow*oldCount );        

            }        

        }        

    }

// -----------------------------------------------------------------------------

// CHgGrid::CalculateSizes()

// -----------------------------------------------------------------------------

//

void CHgGrid::CalculateSizes()

    {

    // Count number of visible rows

    // First is checked if 3x4 or 4x3 items fits to the grid.

    iCols = limits.LastColumn() + 1;

    iRows = limits.LastRow() + 1;

    iLayoutData->ChangeCols( iCols );

    if( iLandscapeScrolling )

        {

        for(TInt i = 0; i < iRows; ++i)

            {

            }

        }

    else

        {

        for(TInt i = 0; i < iCols; ++i)

            {

            }

        }

    TAknLayoutRect gridAppPane;

    TAknLayoutRect gridItem;

    TAknLayoutRect gridImage;

    gridAppPane.LayoutRect( GridRect(),  iLayoutData->ItemLayout()); 

    gridItem.LayoutRect( gridAppPane.Rect(),  iLayoutData->ColumnLayout(0));

    gridImage.LayoutRect( gridItem.Rect(),  iLayoutData->IconLayout());

    if( iLandscapeScrolling )

        {

        iRowHeight = gridItem.Rect().Width();

        iRowWidth = gridItem.Rect().Height();        

        }

    else

        {

        iRowHeight = gridItem.Rect().Height();

        iRowWidth = gridItem.Rect().Width();        

        }

    iImageSize = gridImage.Rect().Size();

    TAknLayoutRect indicator;

    indicator.LayoutRect( gridItem.Rect(), iLayoutData->FirstIndicatorLayout() );

    iIndicatorSize = indicator.Rect().Size();

    }

// -----------------------------------------------------------------------------

// CHgGrid::GetSelected()

// -----------------------------------------------------------------------------

//

TInt CHgGrid::GetSelected( TPoint aPosition ) const

    {

    TAknLayoutRect gridAppPane;

    gridAppPane.LayoutRect( GridRect(), iLayoutData->ItemLayout()); 

    aPosition -= gridAppPane.Rect().iTl;

    TInt index = 0;

    if( iLandscapeScrolling )

        {

        TInt y = aPosition.iY + ((iViewPosition.iY - (iHeight/2)) % iRowWidth);

        y /= iRowWidth;

        TInt x = 0;

        if( AknLayoutUtils::LayoutMirrored() )

            {

            x = aPosition.iX - ((iViewPosition.iX - (iWidth/2)) % iRowHeight);

            if(x < 0) // to correct the division

                x-= iRowHeight;

            x /= iRowHeight;

            x = ((iWidth / iRowHeight) - 1) - x; // mirrored correction to x

            }

        else

            {

            x = aPosition.iX + ((iViewPosition.iX - (iWidth/2)) % iRowHeight);

            x /= iRowHeight;

            }

        index = (iCurrentRow*iRows) + (x*iRows) + y;        

        }

    else

        {

        TInt x = aPosition.iX + ((iViewPosition.iX - (iWidth/2)) % iRowWidth);

        TInt y = aPosition.iY + ((iViewPosition.iY - (iHeight/2)) % iRowHeight);

        x /= iRowWidth;

        y /= iRowHeight;

        if( AknLayoutUtils::LayoutMirrored() )

            {

            x = (iCols - 1) - x;

            }

        index = (iCurrentRow*iCols) + (y*iCols) + x;        

        }

    return index >= iItems.Count() || index < 0 ? KErrNotFound : index;

    }

// -----------------------------------------------------------------------------

// CHgGrid::TotalSize()

// -----------------------------------------------------------------------------

//

TSize CHgGrid::TotalSize() const

    {

    return iLandscapeScrolling ? TSize( iCols*iRowHeight, iHeight ) : TSize(iWidth, iRows*iRowHeight);

    }

// -----------------------------------------------------------------------------

// CHgGrid::DrawHighlight()

// -----------------------------------------------------------------------------

//

void CHgGrid::DrawHighlight( const TRect& aOuterRect ) const

    {

    TRect innerRect( aOuterRect );

    innerRect.Shrink(2,2);

    CWindowGc& gc = SystemGc();

    if( HasHighlight() )

        {

        if( iPointerDown && !iPanning && iFocusedIndex != KErrNotFound && iSelectionToFocusedItem )

            {

            AknsDrawUtils::DrawFrame( AknsUtils::SkinInstance(),

                   gc,

                   aOuterRect,

                   innerRect,

                   KAknsIIDQsnFrGridPressed,

                   KAknsIIDQsnFrGridCenterPressed );        

            }

        else

            {

            AknsDrawUtils::DrawFrame( AknsUtils::SkinInstance(),

                   gc,

                   aOuterRect,

                   innerRect,

                   KAknsIIDQsnFrGrid,

                   KAknsIIDQsnFrGridCenter );        

            }

        }

    else if( iPointerDown && !iPanning )

        {

        AknsDrawUtils::DrawFrame( AknsUtils::SkinInstance(),

               gc,

               aOuterRect,

               innerRect,

               KAknsIIDQsnFrGrid,

               KAknsIIDQsnFrGridCenter );        

        }

    }

// -----------------------------------------------------------------------------

// CHgGrid::DoHandleKeyEvent()

// -----------------------------------------------------------------------------

//