/*

* Copyright (c) 2010 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 <QTimer>

#include <QGraphicsWebView>

#include <QWebPage>

#include <QWebFrame>

#include <QGraphicsScene>

#include <QGraphicsView>

#include "WebTouchNavigation.h"

#include "KineticHelper.h"

#define SCROLL_TIMEOUT   40

namespace GVA {

using namespace qstmGesture;

DecelEdit::DecelEdit(WebTouchNavigation* nav) : QLineEdit(), m_nav(nav)

{

    setMaxLength(6);

    connect(this, SIGNAL(editingFinished()), this, SLOT(setDecel()));

//    connect(this, SIGNAL(returnPressed ()), this, SLOT(setDecel()));

}

void DecelEdit::setDecel()

{

    QString txt = text();

    bool ok = false;

    int decel = txt.toInt(&ok);

    m_nav->m_kinetic->setDeceleration((qreal)decel);

    hide();

}

WebTouchNavigation::WebTouchNavigation(QGraphicsWebView* view) :

		 m_view(view),

		 m_scrollTimer(0)

{

	m_webPage = m_view->page();

	m_kinetic = new KineticHelper(this);

	m_decelEdit = new DecelEdit(this);

}

WebTouchNavigation::~WebTouchNavigation()

{

	disconnect(m_scrollTimer, SIGNAL(timeout()),this,SLOT(pan()));

	delete m_scrollTimer;

	delete m_kinetic;

}

void WebTouchNavigation::handleQStmGesture(QStm_Gesture* gesture)

{

	QStm_GestureType type = gesture->getGestureStmType();

	switch (type) {

	    case QStmTapGestureType:

	    {

	    	doTap(gesture);

	    	break;

	    }

	    case QStmPanGestureType:

	    {

	    	doPan(gesture);

	    	break;

	    }

	    case QStmFlickGestureType:

	    {

	    	doFlick(gesture);

	    	break;

	    }

	    case QStmDoubleTapGestureType:

	    {

	        m_decelEdit->show();

	    	break;

	    }

	    case QStmTouchGestureType:

	    {

	    	doTouch(gesture);

	    	break;

	    }

	}

}

void WebTouchNavigation::doTouch(QStm_Gesture* gesture)

{

	stopScrolling();

	if (m_kinetic->isScrolling()) {

	    m_kinetic->stopScrolling();

	}

}

void WebTouchNavigation::stopScrolling()

{

	if (m_scrollTimer && m_scrollTimer->isActive()) {

	    m_scrollTimer->stop();

	    m_scrollDelta = QPoint(0,0);

	}

}

void WebTouchNavigation::doFlick(QStm_Gesture* gesture)

{

	QPointF pos = mapFromGlobal(gesture->position());

	m_kineticSpeed = gesture->getSpeedVec();

	QStm_GestureDirection direction = static_cast<QStm_GestureDirection>(gesture->getDirection()); 

	if (direction == ENorth || direction == ESouth) {

		m_kineticSpeed.setY(0.0);

	}

	else if (direction == EEast || direction == EWest) {

		m_kineticSpeed.setX(0.0);

	}

	m_kineticSpeed *= -1.0;

	m_frame = m_webPage->frameAt(pos.toPoint());

	m_kinetic->startScrolling();

}

void WebTouchNavigation::doPan(QStm_Gesture* gesture)

{

	if (gesture->gestureState() == Qt::GestureFinished) {

		stopScrolling();

	}

	else {

	  m_scrollDelta += gesture->getLengthAndDirection();

	  Q_ASSERT(m_scrollDelta.x() != 0 || m_scrollDelta.y() != 0);

	  QPointF pos = mapFromGlobal(gesture->position());

	  m_frame = m_webPage->frameAt(pos.toPoint());

      if(!m_scrollTimer) {

          m_scrollTimer = new QTimer(this);

          m_scrollTimer->setSingleShot(false);

          QObject::connect(m_scrollTimer, SIGNAL(timeout()), this, SLOT(pan()));

      }

      if (!m_scrollTimer->isActive()) {

          m_scrollTimer->stop();

          m_scrollTimer->start(SCROLL_TIMEOUT);

      }

	}

}

void WebTouchNavigation::pan()

{

	if (m_scrollDelta.x() != 0 || m_scrollDelta.y() != 0) {

	    m_frame->scroll(-m_scrollDelta.x(), m_scrollDelta.y());

	    m_scrollDelta = QPoint(0,0);

	}

}

void WebTouchNavigation::doTap(QStm_Gesture* gesture)

{

	QPoint gpos = gesture->position(); 

	QPoint pos = mapFromGlobal(gpos).toPoint();

	Qt::MouseButtons buttons = Qt::LeftButton;        

	buttons &= ~Qt::RightButton;

	buttons &= ~Qt::MidButton; 

	buttons &= Qt::MouseButtonMask;

	QMouseEvent mdown (QEvent::MouseButtonPress, pos, gpos, Qt::LeftButton, buttons, Qt::NoModifier);

	QMouseEvent mup (QEvent::MouseButtonRelease, pos, gpos, Qt::LeftButton, Qt::NoButton, Qt::NoModifier);

	m_webPage->event(&mdown);

	m_webPage->event(&mup);

}

QPointF WebTouchNavigation::mapFromGlobal(const QPointF& gpos)

{

	QGraphicsScene* scene = m_view->scene();

	QList<QGraphicsView*> gvList = scene->views();

	QList<QGraphicsView*>::iterator it;

	for(it = gvList.begin(); it != gvList.end(); it++) {

	    if (static_cast<QGraphicsView*>(*it)->hasFocus()) {

	        QWidget* viewport = static_cast<QGraphicsView*>(*it)->viewport();

	        return m_view->mapFromScene(viewport->mapFromGlobal(gpos.toPoint()));

        }

	}

	return QPointF(0.0, 0.0);	

}

void WebTouchNavigation::scrollTo(QPoint& pos)

{

    m_frame->setScrollPosition(pos);

}

QPoint WebTouchNavigation::getScrollPosition()

{

    return m_frame->scrollPosition();

}

QPoint WebTouchNavigation::getInitialPosition()

{

    return m_frame->scrollPosition();    

}

QPointF WebTouchNavigation::getInitialSpeed()

{

    return m_kineticSpeed;    

}

}