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

**

** 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 HbCore 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 "hbeffectopacity_p.h"

#include "hbeffectutils_p.h"

#include "hbeffectgroup_p.h"

#include "hbeffectdef_p.h"

#include <QGraphicsItem>

#include <QRectF>

#include <QtDebug>

HbEffectOpacityAnimation::HbEffectOpacityAnimation(

    HbEffectGroup *group,

    int duration) :

    HbEffectAnimation(group)

{

    setDuration(duration);

}

void HbEffectOpacityAnimation::handleAnimationUpdate(const QVariant &value)

{

    qreal opacity = qVariantValue<qreal>(value);

    mGroup->targetItem()->setOpacity(opacity);

}

void HbEffectOpacityAnimation::handleAnimationFinish()

{

    mGroup->effectFinished();

}

// HbEffectOpacity

HbEffectOpacity::HbEffectOpacity(

    const QList<HbEffectFxmlParamData> &data,

    QGraphicsItem *item,

    HbEffectGroup *group) :

    HbEffectAbstract(0, item, group),

    mAnimation(0)

{

    // Default values of if something is not passed in FXML

    mStartOpacity = 1.0f;

    mEndOpacity = 1.0f;

    int duration = 0;

    QEasingCurve curve = QEasingCurve::Linear;

    QList<HbKeyFrame> keyFrameList;

    const HbEffectFxmlParamData *opacityParam = 0;

    // Handle FXML parameters

    Q_FOREACH(const HbEffectFxmlParamData & param, data) {

        if (param.name() == FXML_KEYWORD_OPACITY) {

            keyFrameList = param.keyFrames();

            HbEffectUtils::resolveFxmlDuration(duration, param);

            HbEffectUtils::resolveFxmlCurveShape(curve, param);

            // Get static value

            param.getValue(mStartOpacity);

            mEndOpacity = mStartOpacity;

            opacityParam = &param;

        }

    }

    if (duration > 0) {

        mAnimation = new HbEffectOpacityAnimation(group, duration);

        foreach(const HbKeyFrame & kf, keyFrameList) {

            if (HbEffectUtils::fuzzyIsNull(kf.pos)) {

                // Start value 0.0 does not work so this trick fixes that.

                mStartOpacity = kf.val + 0.0001f;

            } else if (HbEffectUtils::fuzzyIsOneOrGreater(kf.pos)) {

                mEndOpacity = kf.val;

            }

            // Set keyframe in animation

            else {

                mAnimation->setKeyValueAt(kf.pos, QVariant(kf.val));

            }

        }

        mAnimation->addLooping(opacityParam);

        mAnimation->setEndValue(QVariant(mEndOpacity));

        mAnimation->setStartValue(QVariant(mStartOpacity));

        mAnimation->mCurve = curve;

    }

}

HbEffectOpacity::~HbEffectOpacity()

{

#if QT_VERSION >= 0x040500

    // Item might be deleted at this point, so it cannot be used here

    //item()->setOpacity(mEndOpacity);//performing cancel:bug fix

#endif // QT_VERSION

    delete mAnimation;

}

QString HbEffectOpacity::name() const

{

    return HB_EFFECT_NAME_OPACITY;

}

void HbEffectOpacity::init()

{

}

void HbEffectOpacity::setStartState(QTransform &/*transform*/)

{

#if !(QT_VERSION < 0x040500)

    item()->setOpacity(mStartOpacity);

#endif

}

/* Starts the opacity effect animation. If the effect is already started,

the result is undefined.

*/

void HbEffectOpacity::start()

{

#if !(QT_VERSION < 0x040500)

    item()->setOpacity(mStartOpacity);

#endif

    if (mAnimation) {

        mAnimation->stop();

        mAnimation->setCurrentTime(0);

        mAnimation->start();

    }

    // Static effect

    else {

        // Handle finish immediately, effect has been set in setStartState().

        Hb::EffectEvent reason = Hb::EffectNotStarted;

        group()->effectFinished(reason);

    }

}

/* Cancels the effect animation and sets the animation end state immediately.

*/

void HbEffectOpacity::cancel(QTransform &transform, bool itemIsValid)

{

    Q_UNUSED(transform)

    if (mAnimation) {

        mAnimation->stop();

    }

#if QT_VERSION >= 0x040500

    if (itemIsValid) {

        item()->setOpacity(mEndOpacity);

    }

#endif // QT_VERSION

}

void HbEffectOpacity::updateItemTransform(QTransform &/*transform*/)

{

    // Nothing needed because opacity does not use a transform.

}

void HbEffectOpacity::pause()

{

    if (mAnimation) {

        mAnimation->pause();

    }

}

void HbEffectOpacity::resume()

{

    if (mAnimation) {

        mAnimation->resume();

    }

}