/*

* 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 "HgScrollbar.h"

#include <ganes/HgScrollbarObserverIface.h>

#include "HgConstants.h"

#include <AknsUtils.h>

#include <AknUtils.h>

#include <AknsDrawUtils.h>

#include <layoutmetadata.cdl.h>

#include <aknlayoutscalable_avkon.cdl.h>

#include <aknlayoutscalable_apps.cdl.h>

#include <bitstd.h>

#include <gulicon.h>

#include <AknIconUtils.h>

#include <AknsUtils.h>

#include <AknsConstants.h>

#include <w32std.h>

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

// CHgScrollbar::NewL()

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

//

CHgScrollbar* CHgScrollbar::NewL( MHgScrollbarObserver& aObserver )

    {

    CHgScrollbar* self = new (ELeave) CHgScrollbar( aObserver );

    CleanupStack::PushL( self );

    self->ConstructL();

    CleanupStack::Pop( self );

    return self;

    }

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

// CHgScrollbar::~CHgScrollbar()

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

//

CHgScrollbar::~CHgScrollbar()

    {

    delete iScrollbarBg;

    delete iScrollbarHandle;

    delete iScrollbarHandleBg;

    delete iScrollbarBgSelected;

    delete iScrollbarHandleSelected;

    }

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

// CHgScrollbar::CHgScrollbar()

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

//

CHgScrollbar::CHgScrollbar( MHgScrollbarObserver& aObserver )

    {

    }

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

// CHgScrollbar::ConstructL()

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

//

void CHgScrollbar::ConstructL()

    {

    }

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

// CHgScrollbar::SetScrollbarL()

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

//

void CHgScrollbar::InitScrollBarL(

        TRect aRect,

        TSize aTotalSize,

        TSize aViewSize,

        TBool aLandscapeScrolling )

    {

    if( iTotalSize == aTotalSize 

            && iViewSize == aViewSize 

            && iLandscapeScrolling == aLandscapeScrolling )

        {

        return;

        }

    TInt variety = aLandscapeScrolling ? 1 : 0;

    TAknLayoutRect layout;

    layout.LayoutRect(aRect, AknLayoutScalable_Avkon::scroll_pane( variety ));

    iScrollbarRect = layout.Rect();

    TBool prevStatic = iStatic;

    if((aTotalSize.iHeight <= aViewSize.iHeight && !aLandscapeScrolling)

            || (aTotalSize.iWidth <= aViewSize.iWidth && aLandscapeScrolling) )

        {

        iTotalSize = aViewSize;

        iStatic = ETrue;

        }

    else

        {

        iTotalSize = aTotalSize;

        iStatic = EFalse;

        }

    // Do we need to init the bg graphics

    TBool initBg = (iViewSize != aViewSize) // view size has been changed 

                    || (prevStatic != iStatic) // static value changed

                    || (iLandscapeScrolling != aLandscapeScrolling); // different scrolling direction

    iViewSize = aViewSize;

    iLandscapeScrolling = aLandscapeScrolling;

    iHandlePosition.SetXY(0,0);

    if(iLandscapeScrolling)

        {

        iTotalLength = iTotalSize.iWidth - iViewSize.iWidth;

        }

    else

        {

        iTotalLength = iTotalSize.iHeight - iViewSize.iHeight;

        }

    // Don't init icons in static mode since they are not drawn

    if(!iStatic)

        InitIconsL( initBg );    

    }

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

// CHgScrollbar::SetViewPosition()

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

//

void CHgScrollbar::SetViewPosition( TPoint aPosition )

    {

    if(!iStatic)

        {

        if(iLandscapeScrolling)

            {

            if (AknLayoutUtils::LayoutMirrored())

                {

                iHandlePosition.iX = (iScrollLength) * (1.0 - aPosition.iX / TReal(iTotalLength));

                }

            else

                {

                iHandlePosition.iX = (iScrollLength) * (aPosition.iX / TReal(iTotalLength));            

                }

            }

        else

            {

            iHandlePosition.iY = (iScrollLength) * (aPosition.iY / TReal(iTotalLength));

            }

        CheckHandlePosition( EFalse );

        }

    }

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

// CHgScrollbar::HandlePointerEventL()

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

//

TBool CHgScrollbar::HandlePointerEventL( const TPointerEvent& aEvent )

    {

    return HandleScrollBarPointerEvent( aEvent );

    }

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

// CHgScrollbar::HandleScrollBarPointerEvent()

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

//

TBool CHgScrollbar::HandleScrollBarPointerEvent( const TPointerEvent& aEvent )

    {

    TBool ret = EFalse;

    // Quick and dirty hack, remove when logic for fetching the correct drag rect is available

    TRect dragArea( iScrollbarRect );

    dragArea.iBr.iX += KScrollAreaOffset; 

    dragArea.iTl.iX -= KScrollAreaOffset;

    // Start drag

    if( aEvent.iType == TPointerEvent::EButton1Down && dragArea.Contains(aEvent.iPosition))

        {

        TSize size(iHandleSize);

        size.iWidth += KScrollAreaOffset*2;

        TRect handleRect( dragArea.iTl + iHandlePosition, size );

        iDragging = handleRect.Contains( aEvent.iPosition );

        iPrevDrag = aEvent.iPosition;

        iHandler = ret = ETrue;

        CheckHandlePosition( !iStatic );

        }

    // Drag

    if( aEvent.iType == TPointerEvent::EDrag && iHandler)

        {

        if( iDragging )

            {

            if(iLandscapeScrolling)

                {

                iHandlePosition.iX -= iPrevDrag.iX - aEvent.iPosition.iX;

                }

            else

                {

                iHandlePosition.iY -= iPrevDrag.iY - aEvent.iPosition.iY;

                }

            CheckHandlePosition( !iStatic );

            iPrevDrag = aEvent.iPosition;

            }

        ret = ETrue;

        }

    // End drag

    if( aEvent.iType == TPointerEvent::EButton1Up && iHandler)

        {

        if(!iDragging)

            {

            TBool below = iLandscapeScrolling ? 

                    aEvent.iPosition.iX > iHandlePosition.iX 

                    : aEvent.iPosition.iY > iHandlePosition.iY;

            iHandlePosition += below ? iHandleSize.AsPoint() : -iHandleSize.AsPoint();

            }

        CheckHandlePosition( !iStatic );

        iHandler = iDragging = EFalse; 

        ret = ETrue;

        }

    return ret;    

    }

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

// CHgScrollbar::Draw()

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

//

void CHgScrollbar::Draw( CWindowGc& aGc )

    {

    if(!iStatic)

        DrawScrollbar( aGc );

    }

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

// CHgScrollbar::DrawScrollbar()

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

//

void CHgScrollbar::DrawScrollbar( CWindowGc& aGc )

    {

    if(iScrollbarBg && iScrollbarHandle && iScrollbarHandleBg)

        {

        if(iHandler)

            {

            aGc.BitBltMasked(iScrollbarRect.iTl, 

                    iScrollbarHandleBg->Bitmap(),

                    iScrollbarHandleBg->Bitmap()->SizeInPixels(),

                    iScrollbarHandleBg->Mask(),

                    EFalse);

            aGc.BitBltMasked(iScrollbarRect.iTl + iHandlePosition, 

                    iScrollbarHandleSelected->Bitmap(),

                    iScrollbarHandleSelected->Bitmap()->SizeInPixels(),

                    iScrollbarHandleSelected->Mask(),

                    EFalse);

            }

        else

            {

            aGc.BitBltMasked(iScrollbarRect.iTl, 

                    iScrollbarBg->Bitmap(),

                    iScrollbarBg->Bitmap()->SizeInPixels(),

                    iScrollbarBg->Mask(),

                    EFalse);

            aGc.BitBltMasked(iScrollbarRect.iTl + iHandlePosition, 

                    iScrollbarHandle->Bitmap(),

                    iScrollbarHandle->Bitmap()->SizeInPixels(),

                    iScrollbarHandle->Mask(),

                    EFalse);

            }

        }

    }

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

// CHgScrollbar::CheckHandlePosition()

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

//

void CHgScrollbar::CheckHandlePosition( TBool aReportChange )

    {

    if(iLandscapeScrolling)

        {

        iHandlePosition.iY = 0;

        if(iHandlePosition.iX < 0 )

            iHandlePosition.iX = 0;

        if(iHandlePosition.iX > iScrollLength)

            iHandlePosition.iX = iScrollLength;

        }

    else

        {

        iHandlePosition.iX = 0;

        if(iHandlePosition.iY < 0 )

            iHandlePosition.iY = 0;

        if(iHandlePosition.iY > iScrollLength)

            iHandlePosition.iY = iScrollLength;

        }

    if( aReportChange )

        {

        TPoint pos (iViewSize.iWidth/2, iViewSize.iHeight/2);

        if(iLandscapeScrolling)

            {

            if (AknLayoutUtils::LayoutMirrored())

                {

                pos.iX += (1.0 - iHandlePosition.iX / TReal(iScrollLength)) * (iTotalLength);

                }

            else

                {

                pos.iX += (iHandlePosition.iX / TReal(iScrollLength)) * (iTotalLength);            

                }

            }

        else

            {

            pos.iY += (iHandlePosition.iY / TReal(iScrollLength)) * (iTotalLength);

            }

        iObserver.ScrollBarPositionChanged( pos );

        }

    }

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

// CHgScrollbar::InitIconsL()

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

//

void CHgScrollbar::InitIconsL( TBool aInitBgIcons )

    {

    if(aInitBgIcons)

        {

        delete iScrollbarBg; iScrollbarBg = NULL;

        delete iScrollbarBgSelected; iScrollbarBgSelected = NULL;

        delete iScrollbarHandleBg; iScrollbarHandleBg = NULL;

        CreateIconL(iScrollbarBg, iScrollbarRect.Size());

        CreateIconL(iScrollbarBgSelected, iScrollbarRect.Size());

        CreateIconL(iScrollbarHandleBg, iScrollbarRect.Size());

        }

    TReal xFactor = iScrollbarRect.Width()/TReal(iTotalSize.iWidth);

    TReal yFactor = iScrollbarRect.Height()/TReal(iTotalSize.iHeight); 

    iHandleSize = TSize ( iViewSize.iWidth * xFactor, iViewSize.iHeight * yFactor );

    if(iLandscapeScrolling)

        {

        TInt min = 2*iHandleSize.iHeight;

        if( iHandleSize.iWidth < min )

            {

            iHandleSize.iWidth = min;

            }

        iScrollLength = iScrollbarRect.Width() - iHandleSize.iWidth;

        }

    else

        {

        TInt min = 2*iHandleSize.iWidth;

        if( iHandleSize.iHeight < min )

            {

            iHandleSize.iHeight = min;

            }

        iScrollLength = iScrollbarRect.Height() - iHandleSize.iHeight;

        }

    delete iScrollbarHandle; iScrollbarHandle = NULL;

    delete iScrollbarHandleSelected; iScrollbarHandleSelected = NULL;

    CreateIconL(iScrollbarHandle, iHandleSize );

    CreateIconL(iScrollbarHandleSelected, iHandleSize );

    if( iLandscapeScrolling )

        {

        if( aInitBgIcons )

            {

            DrawIconL( *iScrollbarBg, 

                    KAknsIIDQsnCpScrollHorizontalBgTop, 

                    KAknsIIDQsnCpScrollHorizontalBgMiddle, 

                    KAknsIIDQsnCpScrollHorizontalBgBottom );

            // TODO, check if this is needed.

    //        DrawIconL( *iScrollbarHandleBg, 

    //                KAknsIIDQsnCpScrollHorizontalHandleBgTop, 

    //                KAknsIIDQsnCpScrollHorizontalHandleBgMiddle, 

    //                KAknsIIDQsnCpScrollHorizontalHandleBgBottom );

            DrawIconL( *iScrollbarBgSelected, 

                    KAknsIIDQsnCpScrollHorizontalBgTopPressed, 

                    KAknsIIDQsnCpScrollHorizontalBgMiddlePressed, 

                    KAknsIIDQsnCpScrollHorizontalBgBottomPressed );

            }

        DrawIconL( *iScrollbarHandle, 

                KAknsIIDQsnCpScrollHorizontalHandleTop, 

                KAknsIIDQsnCpScrollHorizontalHandleMiddle, 

                KAknsIIDQsnCpScrollHorizontalHandleBottom);

        DrawIconL( *iScrollbarHandleSelected, 

                KAknsIIDQsnCpScrollHorizontalHandleTopPressed, 

                KAknsIIDQsnCpScrollHorizontalHandleMiddlePressed, 

                KAknsIIDQsnCpScrollHorizontalHandleBottomPressed );        

        }

    else

        {

        if(aInitBgIcons)

            {

            DrawIconL( *iScrollbarBg, 

                    KAknsIIDQsnCpScrollBgTop, 

                    KAknsIIDQsnCpScrollBgMiddle, 

                    KAknsIIDQsnCpScrollBgBottom );

            DrawIconL( *iScrollbarHandleBg, 

                    KAknsIIDQsnCpScrollHandleBgTop, 

                    KAknsIIDQsnCpScrollHandleBgMiddle, 

                    KAknsIIDQsnCpScrollHandleBgBottom );

            DrawIconL( *iScrollbarBgSelected, 

                    KAknsIIDQsnCpScrollBgTopPressed, 

                    KAknsIIDQsnCpScrollBgMiddlePressed, 

                    KAknsIIDQsnCpScrollBgBottomPressed );

            }

        DrawIconL( *iScrollbarHandle, 

                KAknsIIDQsnCpScrollHandleTop, 

                KAknsIIDQsnCpScrollHandleMiddle, 

                KAknsIIDQsnCpScrollHandleBottom);

        DrawIconL( *iScrollbarHandleSelected, 

                KAknsIIDQsnCpScrollHandleTopPressed, 

                KAknsIIDQsnCpScrollHandleMiddlePressed, 

                KAknsIIDQsnCpScrollHandleBottomPressed );        

        }

    }

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

// CHgScrollbar::CreateIconL()

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

//

void CHgScrollbar::CreateIconL( CGulIcon*& aIcon, TSize aSize)

    {

    CFbsBitmap* bmap = new (ELeave) CFbsBitmap;

    CleanupStack::PushL( bmap );

    User::LeaveIfError( bmap->Create( aSize , EColor64K));

    CFbsBitmap* mask = new (ELeave) CFbsBitmap;

    CleanupStack::PushL( mask );

    User::LeaveIfError( mask->Create( aSize , EGray256));

    aIcon = CGulIcon::NewL( bmap, mask );

    CleanupStack::Pop(2, bmap);

    }

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

// CHgScrollbar::DrawIconL()

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

//

void CHgScrollbar::DrawIconL( CGulIcon& aIcon,

        const TAknsItemID& aTop,

        const TAknsItemID& aMiddle,

        const TAknsItemID& aBottom )

    {

    TRect rect;

    TSize iconSize(aIcon.Bitmap()->SizeInPixels());

    TSize tSize;

    TPoint point(0,0);

    if(iLandscapeScrolling)

        {

        tSize.SetSize(iconSize.iHeight, iconSize.iHeight);

        }

    else

        {

        tSize.SetSize(iconSize.iWidth, iconSize.iWidth);

        }

    // TOP

    rect.SetRect(point, tSize);

    DrawBitmapL( aIcon, aTop, rect );

    // MIDDLE

    TSize middlesize(iconSize);

    if(iLandscapeScrolling)

        {

        point.iX = tSize.iWidth;

        middlesize.iWidth -= 2*tSize.iWidth;

        }

    else

        {

        point.iY = tSize.iHeight;

        middlesize.iHeight -= 2*tSize.iHeight;

        }

    rect.SetRect(point, middlesize);

    DrawBitmapL( aIcon, aMiddle, rect);

    // BOTTOM

    point = iconSize.AsPoint()-tSize;

    rect.SetRect(point, tSize);

    DrawBitmapL( aIcon, aBottom, rect );

    }

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

// CHgScrollbar::DrawBitmapL()

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

//

void CHgScrollbar::DrawBitmapL( CGulIcon& aIcon,

        const TAknsItemID& aItem,

        const TRect& aDestRect )

    {

    CFbsBitmap* bitmap = NULL;

    CFbsBitmap* mask = NULL;

    TRAP_IGNORE( AknsUtils::CreateIconL(AknsUtils::SkinInstance(), aItem, bitmap, mask, KNullDesC, -1, -1); )

    if(!bitmap)