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

**

** 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 <hbglobal.h>

#include "hbeffectanimation_p.h"

#include "hbeffectgroup_p.h"

#include "hbeffectdef_p.h"

#include "hbeffectfxmldata_p.h"

#include <QGraphicsItem>

#include <QtDebug>

HbEffectAnimation::HbEffectAnimation() :

    QVariantAnimation(),

    mCurve(QEasingCurve::Linear),

    mLoopStart(-1),

    mLoopEnd(-1),

    mInactive(false),

    mFinished(false)

{

    connect(this, SIGNAL(finished()), this, SLOT(handleFinished()));

}

HbEffectAnimation::~HbEffectAnimation()

{

}

void HbEffectAnimation::addLooping(const HbEffectFxmlParamData *param, HbEffectGroup *group)

{

    if (param) {

        if (param->loopDefined()) {

            int duration = QVariantAnimation::duration();

            int loopStart = (int)(param->loopStart() * float(duration));

            int loopEnd = (int)(param->loopEnd() * float(duration));

            // Limit given values to valid range

            loopStart = qBound(0, loopStart, duration);

            loopEnd = qBound(0, loopEnd, duration);

            // Add looping range to animation if loop end is after its start

            if (loopEnd > loopStart) {

                mLoopStart = loopStart;

                mLoopEnd = loopEnd;

                group->setLooping(true);

            }

        }

    }

}

void HbEffectAnimation::updateCurrentValue(const QVariant &value)

{

    if (mInactive) {

        return;

    }

    // If there is a loop defined, check whether the current time of

    // the animation is past the loop end. If it is, do not update the effect with that value

    // but instead change the current time back to (loopStartTime + currentTime - LoopEndTime).

    if (looping()) {

        int current = currentTime();

        if (current > mLoopEnd) {

            int newCurrentTime = mLoopStart + current - mLoopEnd;

            // If the calculated new current time is again beyond the loop end,

            // change it to the loop end to avoid infinite recursion.

            if (newCurrentTime > mLoopEnd) {

                newCurrentTime = mLoopEnd;

            }

            //qDebug() << "Loop restarted: current time changed from" << current << "to" << newCurrentTime;

            // Set the current time of the animation according to the defined loop,

            // it will create a callback to this function again.

            setCurrentTime(newCurrentTime);

            return;

        }

    }

    // Create a callback to derived classes

    handleAnimationUpdate(value);

}

void HbEffectAnimation::handleFinished()

{

    // Restart loop if the animation is looping

    if (looping()) {

        int current = currentTime();

        int newCurrentTime = mLoopStart + current - mLoopEnd;

        // If the calculated new current time is again beyond the loop end,

        // change it to the loop end to avoid infinite recursion.

        if (newCurrentTime > mLoopEnd) {

            newCurrentTime = mLoopEnd;

        }

        //qDebug() << "Loop restarted: current time changed from" << current << "to" << newCurrentTime;

        // Temporarily prevent the animation from reacting to update request,

        // because start() causes update with time=0 and the loop might start from a later point of time.

        mInactive = true;

        // Restart the animation

        start();

        mInactive = false;

        // Set the current time of the animation according to the defined loop.

        setCurrentTime(newCurrentTime);

    }

    // Otherwise handle finish

    else {

        mFinished = true;

        // Create a callback to derived classes

        handleAnimationFinish();

    }

}

QVariant HbEffectAnimation::interpolated(const QVariant &from, const QVariant &to, qreal progress) const

{

    // Interpolation is handled here so that we can apply curve shape to each keyframe separately.

    // QVariantAnimation would apply the curve shape to the whole animation.

    qreal fromValue = qVariantValue<qreal>(from);

    qreal toValue = qVariantValue<qreal>(to);

    return fromValue + mCurve.valueForProgress(progress) * (toValue - fromValue);

}

// End of File