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

#include "qquickanimationcontroller_p.h"
#include <QtQml/qqmlinfo.h>
#include <private/qqmlengine_p.h>

QT_BEGIN_NAMESPACE


class QQuickAnimationControllerPrivate : public QObjectPrivate
{
    Q_DECLARE_PUBLIC(QQuickAnimationController)
public:
    QQuickAnimationControllerPrivate()
        : progress(0.0), animation(0), animationInstance(0), finalized(false) {}

    qreal progress;
    QQuickAbstractAnimation *animation;
    QAbstractAnimationJob *animationInstance;
    bool finalized:1;

};

/*!
    \qmlclass AnimationController QQuickAnimationController
    \inqmlmodule QtQuick 2
    \ingroup qml-animation-transition
    \brief The AnimationController element allows you to control animations manually.

    Normally animations are driven by an internal timer, but the AnimationController
    allows the given \a animation to be driven by a \a progress value explicitly.
*/


QQuickAnimationController::QQuickAnimationController(QObject *parent)
: QObject(*(new QQuickAnimationControllerPrivate), parent)
{
}

QQuickAnimationController::~QQuickAnimationController()
{
    Q_D(QQuickAnimationController);
    delete d->animationInstance;
}

/*!
    \qmlproperty real QtQuick2::AnimationController::progress
    This property holds the animation progress value.

    The valid \c progress value is 0.0 to 1.0, setting values less than 0 will be converted to 0,
    setting values great than 1 will be converted to 1.
*/
qreal QQuickAnimationController::progress() const
{
    Q_D(const QQuickAnimationController);
    return d->progress;
}

void QQuickAnimationController::setProgress(qreal progress)
{
    Q_D(QQuickAnimationController);
    progress = qBound(qreal(0), progress, qreal(1));

    if (progress != d->progress) {
        d->progress = progress;
        updateProgress();
        emit progressChanged();
    }
}

/*!
    \qmlproperty real QtQuick2::AnimationController::animation
    \default

    This property holds the animation to be controlled by the AnimationController.

    Note:An animation controlled by AnimationController will always have its
         \c running and \c paused properties set to true. It can not be manually
         started or stopped (much like an animation in a Behavior can not be manually started or stopped).
*/
QQuickAbstractAnimation *QQuickAnimationController::animation() const
{
    Q_D(const QQuickAnimationController);
    return d->animation;
}

void QQuickAnimationController::classBegin()
{
    QQmlEnginePrivate *engPriv = QQmlEnginePrivate::get(qmlEngine(this));
    engPriv->registerFinalizeCallback(this, this->metaObject()->indexOfSlot("componentFinalized()"));
}


void QQuickAnimationController::setAnimation(QQuickAbstractAnimation *animation)
{
    Q_D(QQuickAnimationController);

    if (animation != d->animation) {
        if (animation) {
            if (animation->userControlDisabled()) {
                qmlInfo(this) << "QQuickAnimationController::setAnimation: the animation is controlled by others, can't be used in AnimationController.";
                return;
            }
            animation->setDisableUserControl();
        }

        if (d->animation)
            d->animation->setEnableUserControl();

        d->animation = animation;
        reload();
        emit animationChanged();
    }
}

/*!
    \qmlmethod QtQuick2::AnimationController::reload()
    \brief Reloads the animation properties.

    If the animation properties changed, calling this method to reload the animation definations.
*/
void QQuickAnimationController::reload()
{
    Q_D(QQuickAnimationController);
    if (!d->finalized)
        return;

    if (!d->animation) {
        d->animationInstance = 0;
    } else {
        QQuickStateActions actions;
        QQmlProperties properties;
        QAbstractAnimationJob *oldInstance = d->animationInstance;
        d->animationInstance = d->animation->transition(actions, properties, QQuickAbstractAnimation::Forward);
        if (oldInstance && oldInstance != d->animationInstance)
            delete oldInstance;
        d->animationInstance->setLoopCount(1);
        d->animationInstance->start();
        d->animationInstance->pause();
        updateProgress();
    }
}

void QQuickAnimationController::updateProgress()
{
    Q_D(QQuickAnimationController);
    if (!d->animationInstance)
        return;

    d->animationInstance->start();
    QQmlAnimationTimer::unregisterAnimation(d->animationInstance);
    d->animationInstance->setCurrentTime(d->progress * d->animationInstance->duration());
}

void QQuickAnimationController::componentFinalized()
{
    Q_D(QQuickAnimationController);
    d->finalized = true;
    reload();
}


QT_END_NAMESPACE