/****************************************************************************

**

** Copyright (C) 2008-2010 Nokia Corporation and/or its subsidiary(-ies).

** All rights reserved.

** Contact: Nokia Corporation (developer.feedback@nokia.com)

**

** This file is part of the HbWidgets module of the UI Extensions for Mobile.

**

** GNU Lesser General Public License Usage

** This file may be used under the terms of the GNU Lesser General Public

** License version 2.1 as published by the Free Software Foundation and

** appearing in the file LICENSE.LGPL included in the packaging of this file.

** Please review the following information to ensure the GNU Lesser General

** Public License version 2.1 requirements will be met:

** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.

**

** In addition, as a special exception, Nokia gives you certain additional

** rights.  These rights are described in the Nokia Qt LGPL Exception

** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.

**

** If you have questions regarding the use of this file, please contact

** Nokia at developer.feedback@nokia.com.

**

****************************************************************************/

#include "hbprogresssliderhandle_p.h"

#include <hbtooltip.h>

#include <hbstyleoptionprogresssliderhandle_p.h>

#include <hbextendedlocale.h>

#include <QGraphicsSceneMouseEvent>

#define HBPROGRESSSLIDERHANDLE_TRACES

#ifdef HBPROGRESSSLIDERHANDLE_TRACES

#include <QtDebug>

#endif

#include <hbwidgetfeedback.h>

#ifdef HB_EFFECTS

#include "hbeffect.h"

#include "hbeffectinternal_p.h"

#define HB_PRGRESSSLIDERHANDLE_ITEM_TYPE "HB_PROGRESSSLIDERHANDLE"

#endif

#ifdef HB_GESTURE_FW

#include <hbtapgesture.h>

#include <hbpangesture.h>

#endif

#define   HandleMargin 0

/*!

    \reimp

    \fn int HbProgressSliderHandle::type() const

 */

HbProgressSliderHandle::HbProgressSliderHandle(HbHandleParent *parent) 

    :HbWidget(parent->parentGraphicsItem()),

    q(parent),

{

    mFlags = 0;

    mFlags |= TextVisible;

    HbStyle *style = static_cast<HbStyle*>(q->style());

    mHandleIconItem = style->createPrimitive(HbStyle::P_ProgressSliderHandle_icon,this);

    HbStyle::setItemName(mHandleIconItem , "icon");

    mTouchItem = style->createPrimitive(HbStyle::P_ProgressSliderHandle_toucharea, this); 

    HbStyle::setItemName(mTouchItem , "toucharea");

    setProperty("state","normal");

#ifdef HB_EFFECTS

    HbEffectInternal::add(HB_PRGRESSSLIDERHANDLE_ITEM_TYPE,"progressslider_handlepress", "progressslider_handlepress");

    HbEffectInternal::add(HB_PRGRESSSLIDERHANDLE_ITEM_TYPE,"progressslider_handlerelease", "progressslider_handlerelease");

    HbEffectInternal::add(HB_PRGRESSSLIDERHANDLE_ITEM_TYPE,"progressslider_handleoutofbound", "progressslider_handleoutofbound");

#endif

#ifdef HB_GESTURE_FW

    grabGesture(Qt::TapGesture);

    grabGesture(Qt::PanGesture);

    if(QGraphicsObject *touchArea = mTouchItem->toGraphicsObject()) {

        touchArea->grabGesture(Qt::TapGesture);

        touchArea->grabGesture(Qt::PanGesture);

    }

#endif 

}

HbProgressSliderHandle::~HbProgressSliderHandle() 

{

}

void HbProgressSliderHandle::setHandleIcon(const HbIcon& icon)

{

    if(icon.isNull()) {

        return;

    }

    HbStyle *style = qobject_cast<HbStyle*>(q->style());

    mHandleIcon= icon;

    HbStyleOptionProgressSliderHandle option;

    initStyleOption(&option);

    style->updatePrimitive(mHandleIconItem, HbStyle::P_ProgressSliderHandle_icon, &option);

}

void HbProgressSliderHandle::gestureEvent(QGestureEvent *event)

{

    Q_UNUSED(event);

    // HbWidgetBase::gestureEvent() ignores, overriding to accept

}

void HbProgressSliderHandle::mousePressEvent(QGraphicsSceneMouseEvent *event) 

{

    HbWidget::mousePressEvent(event);

#ifdef HB_EFFECTS

    HbEffect::start(this, HB_PRGRESSSLIDERHANDLE_ITEM_TYPE, "progressslider_handlepress");

#endif

    mFlags |= HbProgressSliderHandle::MousePressed;

    HbStyleOptionProgressSliderHandle option;

    option.pressedState = true;

    if (mHandleIconItem) {

        style()->updatePrimitive(mHandleIconItem, HbStyle::P_ProgressSliderHandle_icon, &option);

    }

    mMousePressPos = event->scenePos();

    mItemPosAtPress = pos();

    if(q->textVisible()) {

        HbToolTip::showText(q->toolTipText(),this, QRectF(mItemPosAtPress,QSize(0,0)),q->textAlignment());

    }

    HbWidgetFeedback::triggered(q->parentGraphicsWidget(), Hb::InstantPressed, Hb::ModifierSliderHandle);

    event->accept();

    q->emitSliderPressed();    

}

void HbProgressSliderHandle::mouseReleaseEvent(QGraphicsSceneMouseEvent *event) 

{

    HbWidget::mouseReleaseEvent(event);

    HbStyleOptionProgressSliderHandle option;

    option.pressedState = false;

    if (mHandleIconItem) {

        style()->updatePrimitive(mHandleIconItem, HbStyle::P_ProgressSliderHandle_icon, &option);

    }

    if (isHandleMoving()) {

      HbWidgetFeedback::continuousStopped(q->parentGraphicsWidget(), Hb::ContinuousDragged);

    }

    HbWidgetFeedback::triggered(q->parentGraphicsWidget(), Hb::InstantReleased, Hb::ModifierSliderHandle);

#ifdef HB_EFFECTS

    HbEffect::start(this, HB_PRGRESSSLIDERHANDLE_ITEM_TYPE, "progressslider_handlerelease");

#endif

    mFlags &= ~HbProgressSliderHandle::MousePressed;

    mFlags &=~HandleMoving;

    event->accept();

    q->emitSliderReleased();

}

void HbProgressSliderHandle::handleTrackRelease(QGraphicsSceneMouseEvent * event)

{

    Q_UNUSED(event);

    setHandlePosForValue(q->progressValue());   

}

void HbProgressSliderHandle::handleTrackPress(QGraphicsSceneMouseEvent * event)

{

    QPointF newPos = q->parentGraphicsItem()->mapFromScene(event->scenePos());

    if((newPos.x() >=  q->boundingRect().x()) && (newPos.x() <=  q->boundingRect().width())) {   

        if(q->orientation() == Qt::Horizontal){

            mItemCurPos = QPointF(newPos.x() - boundingRect().width()/2, pos().y());

        }

        else{

            mItemCurPos = QPointF(pos().x(), newPos.y()-boundingRect().height()/2);

        }

        mItemCurPos = normalizedPos(mItemCurPos,false);

        setPos(mItemCurPos);

        processItemChange(mItemCurPos);

    }

}

void HbProgressSliderHandle::mouseMoveEvent ( QGraphicsSceneMouseEvent * event ) 

{

    HbWidget::mouseMoveEvent(event);

    mFlags |=HandleMoving;

    QPointF scenePos = event->scenePos();

    if(q->orientation() == Qt::Horizontal){

             mItemCurPos = QPointF((event->scenePos().x() - mMousePressPos.x()) + mItemPosAtPress.x(), pos().y());

             HbWidgetFeedback::continuousTriggered(qobject_cast<HbWidget*>(q->parentGraphicsWidget()), Hb::ContinuousDragged);

             if(mItemCurPos.x()+boundingRect().width() < q->boundingRect().width()

                 && mItemCurPos.x()>HandleMargin){

                setPos(mItemCurPos);

             }

             else{

                processItemChange(mItemCurPos);

             }

        }

     if (!mTouchItem->boundingRect().contains(parentItem()->mapFromScene(scenePos))) {

        #ifdef HB_EFFECTS

            HbEffect::start(this, HB_PRGRESSSLIDERHANDLE_ITEM_TYPE, "progressslider_handleoutofbound");

        #endif

    }

    if(q->textVisible()) {

        HbToolTip::showText(q->toolTipText(),this, QRectF(mItemCurPos,QSize(0,0)),q->textAlignment());

    }

    else {

    event->accept();

    q->emitSliderMoved(pointToValue(mItemCurPos));

}

int HbProgressSliderHandle::pointToValue(QPointF point) const

{

    QRectF rect = q->boundingRect();

    qreal effectiveWidth;

    point = normalizedPos(point,q->invertedAppearance());

    qreal givenPixel;

    if(q->orientation() == Qt::Horizontal){

        effectiveWidth = rect.width() - boundingRect().width();

        givenPixel = point.x();

    }

    else{

        effectiveWidth = rect.height() - boundingRect().height();

        givenPixel = effectiveWidth-point.y();

    }

    qreal tickPerPixel = (qreal)(q->maximum()-q->minimum())/effectiveWidth;

    qreal tickForGivenPixel = givenPixel * tickPerPixel;

    tickForGivenPixel = qRound(tickForGivenPixel);

    int value;

    if(!q->invertedAppearance()) {

        value = q->minimum() + (int)tickForGivenPixel;

    } else {

        value = q->maximum() - (int)tickForGivenPixel;

    }

    if(value>q->maximum()) {

        return q->maximum();

    }

    else if(value<q->minimum()) {

        return q->minimum();

    }

    return value;

}

// converts value to handle coordinates

QPointF HbProgressSliderHandle::valueToHandlePos(int value) const

{

    QRectF r1 = q->boundingRect();

    QRectF r2 = boundingRect();

    qreal width;

    if(q->orientation()== Qt::Horizontal){

        width = r1.width() - r2.width();

    }

    else{

        width = r1.height() - r2.height();

    }

    if(q->maximum() != q->minimum()){

        qreal pixelpertick = width/(qreal)(q->maximum()-q->minimum());

        qreal noOfTicks = qreal(value - q->minimum());

        qreal xpos =  noOfTicks * pixelpertick;

        if(q->orientation() == Qt::Horizontal){

            return QPointF(xpos, r1.top());

        }

        else{

            return QPointF(r1.left(),width-xpos);

        }

    }

    else{

        return QPointF(0,0);

    }

}

QPointF HbProgressSliderHandle::normalizedPos(const QPointF&  pos,bool inverted) const 

{

    Q_UNUSED(inverted);

    QPointF newPos = pos;

    if(q->orientation() == Qt::Horizontal){

        if (newPos.x() < HandleMargin) {

            newPos.setX( HandleMargin );

        }

        if (newPos.x() > q->boundingRect().width() - boundingRect().width() - HandleMargin) {

            newPos.setX(q->boundingRect().width() - boundingRect().width() - HandleMargin);

        }

    }

    else{

        if (newPos.y() < HandleMargin) {

            newPos.setY( HandleMargin );

        }

        if (newPos.y() > q->boundingRect().height() - boundingRect().height() - HandleMargin) {

            newPos.setY(q->boundingRect().height() - boundingRect().height() - HandleMargin);

        }

    }

    return newPos;

}

bool HbProgressSliderHandle::isHandlePressed() const

{

    return mFlags.testFlag(HbProgressSliderHandle::MousePressed);

}

bool HbProgressSliderHandle::isHandleMoving() const

{

    return mFlags.testFlag(HbProgressSliderHandle::HandleMoving);

}

QVariant HbProgressSliderHandle::processItemChange(const QVariant &value)

{

        // value is the new position

        QPointF pt = value.toPointF();

        int newValue = pointToValue(pt);

        if(q->orientation() == Qt::Horizontal){

            pt.setY(q->boundingRect().top());

        }

        else{

            pt.setX(q->boundingRect().left());

        }

        q->emitSliderMoved(newValue);

        QPointF newPos = pt;

        return normalizedPos(newPos,false);

}

void HbProgressSliderHandle::setHandlePosForValue(int progressValue)

{

    if(!mFlags.testFlag(HbProgressSliderHandle::MousePressed)){

        QPointF newPos = valueToHandlePos(progressValue);

        QPointF pos = normalizedPos(newPos,q->invertedAppearance());

        if(q->invertedAppearance()) {

            if(q->orientation() == Qt::Horizontal){

                qreal xVal = q->boundingRect().width() - pos.x() - boundingRect().width();

                pos.setX(xVal);

            }

            else{

                qreal yVal = q->boundingRect().height() - pos.y() - boundingRect().height();

                pos.setY(yVal);

            }

        }

        qreal yPos = qreal (q->boundingRect().height()-boundingRect().height()) /2 ;

        setPos(pos.x(),yPos);

    }   

}

void  HbProgressSliderHandle::updatePrimitives()

{    

    HbStyleOptionProgressSliderHandle option;

    initStyleOption(&option);

    if (mHandleIconItem) {

        style()->updatePrimitive(mHandleIconItem, HbStyle::P_ProgressSliderHandle_icon, &option);

    }

}

/*!

    Returns the pointer for \a primitive passed.

    Will return NULL if \a primitive passed is invalid

*/

QGraphicsItem* HbProgressSliderHandle::primitive(HbStyle::Primitive primitive) const

{

    switch (primitive) {

        case HbStyle::P_ProgressSliderHandle_icon:

            return mHandleIconItem;

        case HbStyle::P_ProgressSliderHandle_toucharea:

            return mTouchItem;

        default:

            return 0;

    }

}

/*!

    Initializes \a option with the values from this HbProgressSliderHandle. 

    This method is useful for subclasses when they need a HbStyleOptionProgressSliderHandle,

    but don't want to fill in all the information themselves.

 */

void HbProgressSliderHandle::initStyleOption(HbStyleOptionProgressSliderHandle *option) const

{

    HbWidget::initStyleOption(option);

    option->handleIcon = mHandleIcon;

    option->pressedState = false;

}