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#include "private/qdeclarativestate_p.h"

#include "private/qdeclarativestategroup_p.h"

#include "private/qdeclarativestate_p_p.h"

#include "private/qdeclarativestateoperations_p.h"

#include "private/qdeclarativeanimation_p.h"

#include "private/qdeclarativeanimation_p_p.h"

#include "private/qdeclarativetransitionmanager_p_p.h"

#include <QParallelAnimationGroup>

QT_BEGIN_NAMESPACE

/*!

    \qmlclass Transition QDeclarativeTransition

    \since 4.7

    \brief The Transition element defines animated transitions that occur on state changes.

    \sa {qmlstates}{States}, {state-transitions}{Transitions}, {QtDeclarative}

*/

/*!

    \internal

    \class QDeclarativeTransition

    \brief The QDeclarativeTransition class allows you to define animated transitions that occur on state changes.

*/

//ParallelAnimationWrapper allows us to do a "callback" when the animation finishes, rather than connecting

//and disconnecting signals and slots frequently

class ParallelAnimationWrapper : public QParallelAnimationGroup

{

    Q_OBJECT

public:

    ParallelAnimationWrapper(QObject *parent = 0) : QParallelAnimationGroup(parent) {}

    QDeclarativeTransitionPrivate *trans;

protected:

    virtual void updateState(QAbstractAnimation::State newState, QAbstractAnimation::State oldState);

};

class QDeclarativeTransitionPrivate : public QObjectPrivate

{

    Q_DECLARE_PUBLIC(QDeclarativeTransition)

public:

    QDeclarativeTransitionPrivate() 

    : fromState(QLatin1String("*")), toState(QLatin1String("*")), 

      reversed(false), reversible(false), endState(0)

    {

        group.trans = this;

    }

    QString fromState;

    QString toState;

    bool reversed;

    bool reversible;

    ParallelAnimationWrapper group;

    QDeclarativeTransitionManager *endState;

    void complete()

    {

        endState->complete();

    }

    static void append_animation(QDeclarativeListProperty<QDeclarativeAbstractAnimation> *list, QDeclarativeAbstractAnimation *a);

    QList<QDeclarativeAbstractAnimation *> animations;

};

void QDeclarativeTransitionPrivate::append_animation(QDeclarativeListProperty<QDeclarativeAbstractAnimation> *list, QDeclarativeAbstractAnimation *a)

{

    QDeclarativeTransition *q = static_cast<QDeclarativeTransition *>(list->object);

    q->d_func()->animations.append(a);

    q->d_func()->group.addAnimation(a->qtAnimation());

    a->setDisableUserControl();

}

void ParallelAnimationWrapper::updateState(QAbstractAnimation::State newState, QAbstractAnimation::State oldState)

{

    QParallelAnimationGroup::updateState(newState, oldState);

    if (newState == Stopped && (duration() == -1

        || (direction() == QAbstractAnimation::Forward && currentLoopTime() == duration())

        || (direction() == QAbstractAnimation::Backward && currentLoopTime() == 0)))

    {

        trans->complete();

    }

}

QDeclarativeTransition::QDeclarativeTransition(QObject *parent)

    : QObject(*(new QDeclarativeTransitionPrivate), parent)

{

}

QDeclarativeTransition::~QDeclarativeTransition()

{

}

void QDeclarativeTransition::stop()

{

    Q_D(QDeclarativeTransition);

    d->group.stop();

}

void QDeclarativeTransition::setReversed(bool r)

{

    Q_D(QDeclarativeTransition);

    d->reversed = r;

}

void QDeclarativeTransition::prepare(QDeclarativeStateOperation::ActionList &actions,

                            QList<QDeclarativeProperty> &after,

                            QDeclarativeTransitionManager *endState)

{

    Q_D(QDeclarativeTransition);

    qmlExecuteDeferred(this);

    if (d->reversed) {

        for (int ii = d->animations.count() - 1; ii >= 0; --ii) {

            d->animations.at(ii)->transition(actions, after, QDeclarativeAbstractAnimation::Backward);

        }

    } else {

        for (int ii = 0; ii < d->animations.count(); ++ii) {

            d->animations.at(ii)->transition(actions, after, QDeclarativeAbstractAnimation::Forward);

        }

    }

    d->endState = endState;

    d->group.setDirection(d->reversed ? QAbstractAnimation::Backward : QAbstractAnimation::Forward);

    d->group.start();

}

/*!

    \qmlproperty string Transition::from

    \qmlproperty string Transition::to

    These properties are selectors indicating which state changes should trigger the transition.

    from is used in conjunction with to to determine when a transition should

    be applied. By default from and to are both "*" (any state). In the following example,

    the transition is applied when changing from state1 to state2.

    \code

    Transition {

        from: "state1"

        to: "state2"

        ...

    }

    \endcode

*/

QString QDeclarativeTransition::fromState() const

{

    Q_D(const QDeclarativeTransition);

    return d->fromState;

}

void QDeclarativeTransition::setFromState(const QString &f)

{

    Q_D(QDeclarativeTransition);

    if (f == d->fromState)

        return;

    d->fromState = f;

    emit fromChanged();

}

/*!

    \qmlproperty bool Transition::reversible

    This property holds whether the transition should be automatically reversed when the conditions that triggered this transition are reversed.

    The default value is false.

*/

bool QDeclarativeTransition::reversible() const

{

    Q_D(const QDeclarativeTransition);

    return d->reversible;

}

void QDeclarativeTransition::setReversible(bool r)

{

    Q_D(QDeclarativeTransition);

    if (r == d->reversible)

        return;

    d->reversible = r;

    emit reversibleChanged();

}

QString QDeclarativeTransition::toState() const

{

    Q_D(const QDeclarativeTransition);

    return d->toState;

}

void QDeclarativeTransition::setToState(const QString &t)

{

    Q_D(QDeclarativeTransition);

    if (t == d->toState)

        return;

    d->toState = t;

    emit toChanged();

}

/*!

    \qmlproperty list<Animation> Transition::animations

    \default

    This property holds a list of the animations to be run for this transition.

    The top-level animations are run in parallel. To run them sequentially,

    you can create a single SequentialAnimation which contains all the animations,

    and assign that to animations the animations property.

    \default

*/

QDeclarativeListProperty<QDeclarativeAbstractAnimation> QDeclarativeTransition::animations()

{

    Q_D(QDeclarativeTransition);

    return QDeclarativeListProperty<QDeclarativeAbstractAnimation>(this, &d->animations, QDeclarativeTransitionPrivate::append_animation);

}

QT_END_NAMESPACE

#include <qdeclarativetransition.moc>