/*

* Copyright (c) 2008 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:   

*

*/

// INCLUDE FILES

#include <../bidi.h>

#include "WebPagePinchZoomHandler.h"

#include "WebView.h"

#include "PluginSkin.h"

const int KBitmapUpdateTimeout  = 100*1000;

const int KPinchExitWaitTimeout = 300*1000;

const int KPinchZoomStepSizeSmall  = 3;

const int KPinchZoomStepSizeMedium = 4;

const int KPinchZoomStepSizeLarge  = 5;

const int KMinPinchFactor = 1;

int pinchBitmapUpdateTimerCb( void* ptr );

int pinchExitWaitTimerCb( void* ptr );

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

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

// WebPagePinchZoomHandler::NewL

// The two-phase Symbian constructor

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

//

WebPagePinchZoomHandler* WebPagePinchZoomHandler::NewL(WebView* webView)

{

    WebPagePinchZoomHandler* self = new (ELeave) WebPagePinchZoomHandler(webView);

    CleanupStack::PushL(self);

    self->constructL();

    CleanupStack::Pop(); //self

    return self;

}

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

// WebPagePinchZoomHandler::WebPointerEventHandler

// C++ default constructor

//

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

//

WebPagePinchZoomHandler::WebPagePinchZoomHandler(WebView* webView)

: m_webView(webView)

, m_zoomOutBaseLevel(0)

, m_pinchCenterSet(false)

, m_zoomStepSize(0)

, m_pinchActive(false)

, m_pinchCenter(0,0)

{

}

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

// WebPagePinchZoomHandler::constructL

// The constructor that can contain code that might leave.

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

//

void WebPagePinchZoomHandler::constructL()

{

    m_bitmapUpdateTimer = CPeriodic::NewL(CActive::EPriorityHigh);

    m_pinchExitWaitTimer = CPeriodic::NewL(CActive::EPriorityHigh);

}

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

// WebPagePinchZoomHandler::~WebPagePinchZoomHandler

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

WebPagePinchZoomHandler::~WebPagePinchZoomHandler()

{

    if (m_bitmapUpdateTimer->IsActive())

        m_bitmapUpdateTimer->Cancel();

    delete m_bitmapUpdateTimer;

    if (m_pinchExitWaitTimer->IsActive()) 

        m_pinchExitWaitTimer->Cancel();

    delete m_pinchExitWaitTimer;

}

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

// getPinchZoomStepSize

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

TInt WebPagePinchZoomHandler::getPinchZoomStepSize()

{

    TInt zoomStepSize = 0;

    TInt absPinchFactor = Abs (m_pinchFactor);

    if (absPinchFactor == 0)

        return zoomStepSize;

    if ( absPinchFactor >= KMinPinchFactor  &&  absPinchFactor <= 10 ) {

        zoomStepSize = KPinchZoomStepSizeSmall;

    }    

    else if ( absPinchFactor > 10 && absPinchFactor <= 20 ) {

        zoomStepSize = KPinchZoomStepSizeMedium;

    }  

    else if ( absPinchFactor > 20 ) {

        zoomStepSize = KPinchZoomStepSizeLarge;

    }

    return (m_pinchFactor/absPinchFactor) * zoomStepSize; 

}

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

// handlePinchGestureEventL

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

void WebPagePinchZoomHandler::handlePinchGestureEventL(const TStmGestureEvent& aGesture)

{

    if(aGesture.GestureState() == EGestureEnter) {

        m_pinchActive = true;

        handlePinchGestureL(aGesture);

    }

    else {

        m_pinchActive = false;

        handlePinchGestureExitL(aGesture);

    }

}

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

// handlePinchGestureL

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

void WebPagePinchZoomHandler::handlePinchGestureL(const TStmGestureEvent& aGesture)

{

    m_pinchFactor = aGesture.Details();

    TInt zoomValue = 0;

    TInt currentZoom = m_webView->zoomLevel();

    TInt zoomStepSize = getPinchZoomStepSize();

    if (zoomStepSize == 0)

        return;

    zoomValue = currentZoom + zoomStepSize;

    if (m_zoomStepSize > 0 && zoomStepSize < 0)  m_zoomOutBaseLevel = currentZoom / 2;

    m_zoomStepSize = zoomStepSize;

    if(zoomValue >= m_webView->minZoomLevel() && zoomValue <= m_webView->maxZoomLevel()) {

        if (!m_pinchCenterSet) {

            TPoint pinchCenter = aGesture.PinchEndPos() + aGesture.CurrentPos(); 

            m_pinchCenter.iX = pinchCenter.iX / 2;

            m_pinchCenter.iY = pinchCenter.iY / 2;

            m_pinchCenterSet = true;

            if (zoomStepSize < 0)   m_zoomOutBaseLevel = currentZoom / 2;  

        }

        if (!(zoomStepSize < 0 && zoomValue < m_zoomOutBaseLevel))

            setZoomLevelL(zoomValue);

    }

}

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

// handlePinchGestureExitL

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

void WebPagePinchZoomHandler::handlePinchGestureExitL(const TStmGestureEvent& aGesture)

{

    m_zoomOutBaseLevel  = 0;

    m_zoomStepSize = 0;

    m_pinchCenterSet = false;

    if (!m_bitmapUpdateTimer->IsActive()) 

        m_bitmapUpdateTimer->Start( KBitmapUpdateTimeout,KBitmapUpdateTimeout,TCallBack(&pinchBitmapUpdateTimerCb,this));

    if (!m_pinchExitWaitTimer->IsActive()) 

        m_pinchExitWaitTimer->Start( KPinchExitWaitTimeout,0,TCallBack(&pinchExitWaitTimerCb,this));

}

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

// setZoomLevelL

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

void WebPagePinchZoomHandler::setZoomLevelL(int zoomLevel)

{

    m_webView->setPinchBitmapZoomLevelL(zoomLevel);

}

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

// isPinchActive

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

TBool WebPagePinchZoomHandler::isPinchActive()

{

  bool pinchActive = false;

  if (m_pinchActive == true || m_pinchExitWaitTimer->IsActive())

      pinchActive = true;

  return pinchActive;

}

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

// updateBitmap

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

void WebPagePinchZoomHandler::updateBitmap(void)

{

    m_bitmapUpdateTimer->Cancel();

    m_webView->restoreZoomLevel(m_webView->scalingFactor());

    m_webView->startCheckerBoardDestroyTimer();

}

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

// handlepinchExitWaitTimer

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

void WebPagePinchZoomHandler::handlepinchExitWaitTimer(void)

{

    m_pinchExitWaitTimer->Cancel();

}

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

// pinchBitmapUpdateTimerCb

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

int pinchBitmapUpdateTimerCb(void* ptr)

{

    ((WebPagePinchZoomHandler*)ptr)->updateBitmap();

    return 0;

}

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

// pinchExitWaitTimerCb

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

int pinchExitWaitTimerCb(void* ptr)

{

    ((WebPagePinchZoomHandler*)ptr)->handlepinchExitWaitTimer();

    return 0;

}

//  End of File