/*

* Copyright (c) 2002-2005 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of the License "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:  History View

*

*/

// INCLUDE FILES

#include <../bidi.h>

#include    "HistoryView.h"

#include    "HistoryController.h"

#include    "HistoryEntry.h"

#include    <coemain.h>

#include    "WebSurface.h"

#include "eikon.hrh"

// EXTERNAL DATA STRUCTURES

//extern  ?external_data;

// EXTERNAL FUNCTION PROTOTYPES

//extern ?external_function( ?arg_type,?arg_type );

// CONSTANTS

const int KHistoryViewOffsetX = 2;

const int KAutoScrollPeriodic = 300 * 1000;

//Animation related factors

const int KResizeFactorIncr = 20;

const int KAnimFactorInc = 25;

const int KDragDelta = 7;

const int KFastScrollAnimFactorInc = 40;

const int KMaxAnimFactor = 100;

const int KMinAnimFactor = 0;

const int KMinimumScroll = 20;

#define KSideImageBorderColor KRgbBlack

// ============================= LOCAL FUNCTIONS ===============================

TBool animRepaint(TAny* aAny)

{

    HistoryView* historyView = static_cast<HistoryView*> (aAny);

    bool result = historyView->calcRepaintRect();

    return result;

}

TBool animPlaceHolderRepaint(TAny* aAny)

{

    HistoryView* historyView = static_cast<HistoryView*> (aAny);

    bool result = historyView->animatePlaceHolderPosition();

    return result;

}

TInt autoScrollCallback( TAny* aPtr )

{

    static_cast<HistoryView*>(aPtr)->autoScroll();

    return KErrNone;

}

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

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

// HistoryView::HistoryView

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

// might leave.

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

//

HistoryView::HistoryView(HistoryController& historyController, bool previous)

    : m_historyController( &historyController ),

    m_resizeFactor (KMinAnimFactor),

    m_placeHolderResizeFactor(KMinAnimFactor)

{

    m_historyStackIndex = historyController.currentIndex();

    m_centerPageIndex = m_historyStackIndex;

    if (previous) {

        // we can assume that index is greater than 1 if ShowView

        // is invoked as a result of "Back" operation

        m_centerPageIndex--;

    }

}

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

// ?HistoryView::ConstructL

// Symbian 2nd phase constructor can leave.

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

//

void HistoryView::ConstructL()

{

    CCoeControl* parent = m_historyController->historyCallback()->parent();

    SetContainerWindowL(*parent);

    m_repaintTimer = CIdle::NewL( CActive::EPriorityHigh );

    // rendering surface

    m_renderTarget = m_historyController->historyCallback()->surface();

    // Create an offscreen device and context

    m_bitmapDevice = CFbsBitmapDevice::NewL( m_renderTarget->offscreenBitmap() );

    User::LeaveIfError(m_bitmapDevice->CreateContext(m_bitmapContext));

    SetRect(parent->Rect());

    m_repaintTimer->Start(TCallBack(&animRepaint,this));

}

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

// HistoryView::NewL

// Two-phased constructor.

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

//

HistoryView* HistoryView::NewL(HistoryController& historyController, bool previous)

{

    HistoryView* self = new( ELeave ) HistoryView(historyController, previous);

    CleanupStack::PushL( self );

    self->ConstructL();

    CleanupStack::Pop();

    return self;

}

// Destructor

HistoryView::~HistoryView()

{

    delete m_bitmapDevice;

    delete m_bitmapContext;

    if (m_repaintTimer->IsActive()) {

        m_repaintTimer->Cancel();

    }

    delete m_repaintTimer;

    if (m_autoScrollPeriodic) {

        m_autoScrollPeriodic->Cancel();

        delete m_autoScrollPeriodic;

    }

}

bool HistoryView::calcRepaintRect()

{

    if (m_resizeFactor == KMaxAnimFactor) {

        m_repaintRect.SetRect(Rect().iTl,Rect().Size());

        m_historyController->updateDisplay();

        return false;

    }

    m_repaintRect.SetRect(Rect().iTl,TSize(Rect().Width()*m_resizeFactor/100,Rect().Height()*m_resizeFactor/100));

    m_resizeFactor += KResizeFactorIncr;

    m_historyController->updateDisplay();

    return true;

}

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

// HistoryView::OfferKeyEventL

// Processes Key Event

// (other items were commented in a header).

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

//

TKeyResponse HistoryView::OfferKeyEventL(const TKeyEvent& aKeyEvent, TEventCode )

{

    TKeyResponse keyResponse( EKeyWasNotConsumed );

    m_fastScroll = false;

    // Determine the key event and handle it

    switch (aKeyEvent.iCode)

        {

        // The arrow key events

        case EKeyRightUpArrow:        // Northeast

        case EStdKeyDevice11:         //   : Extra KeyEvent supports diagonal event simulator wedge

        case EKeyRightArrow:          // East

        case EKeyRightDownArrow:      // Southeast

        case EStdKeyDevice12:         //   : Extra KeyEvent supports diagonal event simulator wedge

            {

                if (aKeyEvent.iRepeats>0) {

                    m_fastScroll = true;

                }

                int historyLength = m_historyController->historyLength();

                if (m_centerPageIndex < ( historyLength -1 )) {

                    m_direction = 1;

                    //Start Animation

                    if (m_repaintTimer->IsActive()) {

                        m_repaintTimer->Cancel();

                        m_resizeFactor = KMaxAnimFactor;

                    }

                    m_repaintTimer->Start(TCallBack(&animPlaceHolderRepaint,this));

                    keyResponse = EKeyWasConsumed;

                }

                break;

            }

        case EKeyLeftUpArrow:         // Northwest

        case EStdKeyDevice10:         //   : Extra KeyEvent supports diagonal event simulator wedge

        case EKeyLeftArrow:           // West

        case EKeyLeftDownArrow:       // Southwest

        case EStdKeyDevice13:         //   : Extra KeyEvent supports diagonal event simulator wedge

            {

                if (aKeyEvent.iRepeats>0) {

                    m_fastScroll = true;

                }

                if (m_centerPageIndex > 0) {

                    m_direction = -1;

                    //Start Animation

                    if (m_repaintTimer->IsActive()) {

                        m_repaintTimer->Cancel();

                        m_resizeFactor = KMaxAnimFactor;

                    }

                    m_repaintTimer->Start(TCallBack(&animPlaceHolderRepaint,this));

                    keyResponse = EKeyWasConsumed;

                }

                break;

            }

            // The enter key events. aka activate key:

        case EKeyEnter:

        case EKeyDevice3:

            {

                //history

                int index = m_historyController->currentIndex();

                HistoryEntry* entryCenter = m_historyController->entryByIndex( m_centerPageIndex );

                HistoryEntry* entryCurrent = m_historyController->entryByIndex( index );

                if (entryCenter && entryCenter->ifWml()) {   // look at last known history stack info if WML

                    m_historyController->setPossibleWmlOEB( false );

                    if (m_centerPageIndex < index ) {

                        m_historyController->setPossibleWmlOEB( true );  // this is always a possibility when navigating back to wml from html

                    }

                    if ( entryCurrent && entryCurrent->ifWml() == false || ((m_centerPageIndex != index) && ((m_centerPageIndex -1 ) != index) && ((m_centerPageIndex + 1) != index)) ) {

                        loadUrl();

                    }

                    else {

                        m_historyController->historyCallback()->handleWmlBackL();

                    }

                }

                else {

                    if (m_centerPageIndex != index)

                    {

                    	loadUrl();	

                    }

                }

                keyResponse = EKeyWasConsumed;

                m_historyController->closeHistoryView();

                break;

            }

        default:

            break;

        }

    return keyResponse;

}

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

// HistoryView::updateDisplay

// Processes Key Event

// (other items were commented in a header).

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

//

void HistoryView::updateDisplay()

{

    m_bitmapContext->Clear();

    m_bitmapContext->Reset();

    // updateDisplay something to the bitmap

    m_centerEntry = m_historyController->entryByIndex( m_centerPageIndex );

    HistoryEntry* leftEntry = m_historyController->entryByIndex( m_centerPageIndex-1 );

    HistoryEntry* rightEntry = m_historyController->entryByIndex( m_centerPageIndex+1 );

    if (leftEntry) {

        if (!leftEntry->thumbnail()) {

            TRAP_IGNORE(leftEntry->constructThumbnailL());

        }

        if (leftEntry->thumbnail()) {

        }

    }

    // updateDisplay the next thumbnail

    if (rightEntry) {

        if (!rightEntry->thumbnail()) {

            TRAP_IGNORE(rightEntry->constructThumbnailL());

        }

        if (rightEntry->thumbnail()) {

        }

    }

    // updateDisplay the center thumbnail

    if (m_centerEntry ) {

        if (!m_centerEntry->thumbnail()) {

            TRAP_IGNORE(m_centerEntry->constructThumbnailL());

        }

        if (m_centerEntry->thumbnail()) {

            m_bitmapContext->BitBlt( m_centerPlaceHolderRect.iTl, m_centerEntry->thumbnail(), TRect(TPoint(0,0), m_centerPlaceHolderRect.Size()) );

        }

    }

    m_bitmapContext->SetPenColor( KCenterImageBorderColor );

    m_bitmapContext->DrawRect( m_centerPlaceHolderRect );

    // Reset Brush

    m_bitmapContext->SetBrushColor(TRgb(255,255,255));

    m_bitmapContext->SetBrushStyle(CGraphicsContext::ENullBrush);

  // updateState(-1);

}

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

// HistoryView::getCenterEntryTitle

//

// return page title of center entry

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

TPtrC HistoryView::getCenterEntryTitle()

{

    if (m_direction == 0) {

        if ( m_centerEntry ) {

            return m_centerEntry->pageTitle();

        }

        return KNullDesC();

    }

    if (m_repaintTimer->IsActive()) {

        if (m_direction == 1) {

            return m_historyController->entryByIndex( m_centerPageIndex + 1)->pageTitle();

        }

        else {

            return m_historyController->entryByIndex( m_centerPageIndex - 1)->pageTitle();

        }

    }

    return TPtrC();

}

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

// HistoryView::Draw

//

// Draws the bitmap

// for the viewable content.

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

void HistoryView::Draw(const TRect& ) const

{

    CWindowGc& gc = SystemGc();

    if (m_resizeFactor!=KMaxAnimFactor) {

        gc.DrawBitmap(m_repaintRect,m_renderTarget->offscreenBitmap());

        gc.DrawRect(Rect());

    }

    else {

        // put offscreen bitmap onto the screen

        gc.BitBlt( m_offscreenRect.iTl, m_renderTarget->offscreenBitmap());

    }

}

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

// HistoryView::SetRect

// public Class Method

// Updates the size of the offscreen bitmap  to improve performance.

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

void HistoryView::SizeChanged()

{

    if ( m_offscreenRect != Rect() ) {

        // Set the Offscreen rect adjusted for scrollbars

        m_offscreenRect = Rect();

        // need to resize the bitmap...

        updateOffscreenBitmapL();

        calculateLayout();

        updateDisplay();

        MakeVisible(true);

    }

}

void HistoryView::calculateLayout()

{

    TSize screenSize = m_offscreenRect.Size();

    TSize viewSize((screenSize.iWidth -2*KHistoryViewOffsetX), screenSize.iHeight);

    int centerImageWidth(viewSize.iWidth*KCenterThumbnailWidthPercent/100);

    int centerImageHeight(viewSize.iHeight*KCenterThumbnailHeightPercent/100);

    TSize centerImageSize(centerImageWidth, centerImageHeight);

    int sideImageWidth(viewSize.iWidth*KSideThumbnailWidthPercent/100);

    int sideImageHeight(viewSize.iHeight*KSideThumbnailHeightPercent/100);

    TSize sideImageSize(sideImageWidth, sideImageHeight);

    int centerImageX(KHistoryViewOffsetX+sideImageWidth);

    int centerImageY(viewSize.iHeight*(100-KCenterThumbnailHeightPercent)/(2*100));

    TPoint centerImageOrigin(centerImageX, centerImageY);

    m_centerPlaceHolderRect.SetRect(centerImageOrigin, centerImageSize);

    int sideImageY(viewSize.iHeight*(100-KSideThumbnailHeightPercent)/(2*100));

    TPoint leftThumbnailOrigin( KHistoryViewOffsetX, sideImageY );

    TPoint rightThumbnailOrigin( (int)(KHistoryViewOffsetX+sideImageWidth+centerImageWidth), sideImageY );

    m_leftPlaceHolderRect.SetRect(leftThumbnailOrigin,sideImageSize);

    m_rightPlaceHolderRect.SetRect(rightThumbnailOrigin,sideImageSize);

    int xPos(m_centerPlaceHolderRect.iBr.iX - m_centerPlaceHolderRect.Size().iWidth/2);

    int yPos(m_centerPlaceHolderRect.iBr.iY);

    int dH(Rect().iBr.iY - m_centerPlaceHolderRect.iBr.iY - 6);

    m_leftArrow[0] = TPoint( KHistoryViewOffsetX + dH, yPos + 3 );

    m_leftArrow[1] = TPoint( KHistoryViewOffsetX + dH, yPos + dH );

    m_leftArrow[2] = TPoint( m_leftArrow[0].iX - (m_leftArrow[1].iY-m_leftArrow[0].iY), (m_leftArrow[0].iY + m_leftArrow[1].iY)/2);

    m_rightArrow[0] = TPoint( viewSize.iWidth - KHistoryViewOffsetX - dH, yPos + 3 );

    m_rightArrow[1] = TPoint( viewSize.iWidth - KHistoryViewOffsetX - dH, yPos + dH );

    m_rightArrow[2] = TPoint( m_rightArrow[0].iX+(m_rightArrow[1].iY-m_rightArrow[0].iY), (m_rightArrow[0].iY+m_rightArrow[1].iY)/2 );

}

bool HistoryView::animatePlaceHolderPosition()

{

    if (m_placeHolderResizeFactor >= KMaxAnimFactor) {

        //Restore old values and end AO

        if (m_direction == 1) {

            m_centerPageIndex++;

            // delete thumbnail going out of the view

            HistoryEntry* entry = m_historyController->entryByIndex( m_centerPageIndex-2 );

            if (entry) {

                entry->deleteThumbnail();

            }

        }

        if (m_direction == -1) {

            m_centerPageIndex--;

            // delete thumbnail going out of the view

            HistoryEntry* entry = m_historyController->entryByIndex( m_centerPageIndex+2 );

            if (entry) {

                entry->deleteThumbnail();

            }

        }

        m_placeHolderResizeFactor = 0;

        m_direction = 0;

        updateDisplay();

        m_historyController->updateDisplay();

        return false;

    }

    TRect rect[4];

    int dw = 0;

    int dh = 0;

    int dx = 0;

    //left movement

    if (m_direction == -1) {

        TPoint pt(m_leftPlaceHolderRect.iTl.iX,m_leftPlaceHolderRect.iTl.iY+ m_leftPlaceHolderRect.Height()/2);

        rect[0] = TRect(pt,TSize(0,0));

        dw = m_leftPlaceHolderRect.Width()*m_placeHolderResizeFactor/200;

        dh = m_leftPlaceHolderRect.Height()*m_placeHolderResizeFactor/200;

        rect[0].Grow(dw,dh);

        rect[0].Move(dw,0);

        rect[1] = m_leftPlaceHolderRect;

        dx = (m_centerPlaceHolderRect.iTl.iX - m_leftPlaceHolderRect.iTl.iX)*m_placeHolderResizeFactor/100;

        dw = (m_centerPlaceHolderRect.Width() - m_leftPlaceHolderRect.Width())*m_placeHolderResizeFactor/200;

        dh = (m_centerPlaceHolderRect.Height() - m_leftPlaceHolderRect.Height())*m_placeHolderResizeFactor/200;

        rect[1].Grow(dw,dh);

        rect[1].Move(dx + dw,0);

        rect[2] = m_centerPlaceHolderRect;

        dx = (m_rightPlaceHolderRect.iTl.iX - m_centerPlaceHolderRect.iTl.iX)*m_placeHolderResizeFactor/100;

        dw = (m_centerPlaceHolderRect.Width() - m_rightPlaceHolderRect.Width())*m_placeHolderResizeFactor/200;

        dh = (m_centerPlaceHolderRect.Height() - m_rightPlaceHolderRect.Height())*m_placeHolderResizeFactor/200;

        rect[2].Shrink(dw,dh);

        rect[2].Move(dx - dw,0);

        rect[3] = m_rightPlaceHolderRect;

        dw = (m_rightPlaceHolderRect.Width())*m_placeHolderResizeFactor/200;

        dh = (m_rightPlaceHolderRect.Height())*m_placeHolderResizeFactor/200;

        rect[3].Shrink(dw,dh);

        rect[3].Move(2*dw,0);

        HistoryEntry* entry = 0;

        //Here we clear the rectangle where we are going to repaint

        m_bitmapContext->SetPenStyle(CGraphicsContext::ENullPen);

        m_bitmapContext->SetBrushColor(TRgb(255,255,255));

        m_bitmapContext->SetBrushStyle(CGraphicsContext::ESolidBrush);

        m_bitmapContext->DrawRect(TRect(TPoint(0,m_centerPlaceHolderRect.iTl.iY),TSize(Rect().Width(),m_centerPlaceHolderRect.Height())));

        for (int i = 0;i<4;i++)

        {

            entry = m_historyController->entryByIndex( m_centerPageIndex-2 + i );

            if (entry && entry->thumbnail())

            {

                TRect intersectRect(TPoint(0,0),m_renderTarget->offscreenBitmap()->SizeInPixels());

                intersectRect.Intersection(rect[i]);

                if (!intersectRect.IsEmpty())

                {

                    m_bitmapContext->BitBlt( intersectRect.iTl, entry->thumbnail(), TRect(TPoint(0,0), rect[i].Size()) );

                    m_bitmapContext->SetPenStyle(CGraphicsContext::ESolidPen);

                    m_bitmapContext->SetPenColor( KSideImageBorderColor );