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/*!

    \class QAnimationGroup

    \brief The QAnimationGroup class is an abstract base class for groups of animations.

    \since 4.6

    \ingroup animation

    An animation group is a container for animations (subclasses of

    QAbstractAnimation). A group is usually responsible for managing

    the \l{QAbstractAnimation::State}{state} of its animations, i.e.,

    it decides when to start, stop, resume, and pause them. Currently,

    Qt provides two such groups: QParallelAnimationGroup and

    QSequentialAnimationGroup. Look up their class descriptions for

    details.

    Since QAnimationGroup inherits from QAbstractAnimation, you can

    combine groups, and easily construct complex animation graphs.

    You can query QAbstractAnimation for the group it belongs to

    (using the \l{QAbstractAnimation::}{group()} function).

    To start a top-level animation group, you simply use the

    \l{QAbstractAnimation::}{start()} function from

    QAbstractAnimation. By a top-level animation group, we think of a

    group that itself is not contained within another group. Starting

    sub groups directly is not supported, and may lead to unexpected

    behavior.

    \omit OK, we'll put in a snippet on this here \endomit

    QAnimationGroup provides methods for adding and retrieving

    animations. Besides that, you can remove animations by calling

    remove(), and clear the animation group by calling

    clear(). You may keep track of changes in the group's

    animations by listening to QEvent::ChildAdded and

    QEvent::ChildRemoved events.

    \omit OK, let's find a snippet here as well. \endomit

    QAnimationGroup takes ownership of the animations it manages, and

    ensures that they are deleted when the animation group is deleted.

    \sa QAbstractAnimation, QVariantAnimation, {The Animation Framework}

*/

#include "qanimationgroup.h"

#include <QtCore/qdebug.h>

#include <QtCore/qcoreevent.h>

#include "qanimationgroup_p.h"

#ifndef QT_NO_ANIMATION

QT_BEGIN_NAMESPACE

/*!

    Constructs a QAnimationGroup.

    \a parent is passed to QObject's constructor.

*/

QAnimationGroup::QAnimationGroup(QObject *parent)

    : QAbstractAnimation(*new QAnimationGroupPrivate, parent)

{

}

/*!

    \internal

*/

QAnimationGroup::QAnimationGroup(QAnimationGroupPrivate &dd, QObject *parent)

    : QAbstractAnimation(dd, parent)

{

}

/*!

    Destroys the animation group. It will also destroy all its animations.

*/

QAnimationGroup::~QAnimationGroup()

{

}

/*!

    Returns a pointer to the animation at \a index in this group. This

    function is useful when you need access to a particular animation.  \a

    index is between 0 and animationCount() - 1.

    \sa animationCount(), indexOfAnimation()

*/

QAbstractAnimation *QAnimationGroup::animationAt(int index) const

{

    Q_D(const QAnimationGroup);

    if (index < 0 || index >= d->animations.size()) {

        qWarning("QAnimationGroup::animationAt: index is out of bounds");

        return 0;

    }

    return d->animations.at(index);

}

/*!

    Returns the number of animations managed by this group.

    \sa indexOfAnimation(), addAnimation(), animationAt()

*/

int QAnimationGroup::animationCount() const

{

    Q_D(const QAnimationGroup);

    return d->animations.size();

}

/*!

    Returns the index of \a animation. The returned index can be passed

    to the other functions that take an index as an argument.

    \sa insertAnimation(), animationAt(), takeAnimation()

*/

int QAnimationGroup::indexOfAnimation(QAbstractAnimation *animation) const

{

    Q_D(const QAnimationGroup);

    return d->animations.indexOf(animation);

}

/*!

    Adds \a animation to this group. This will call insertAnimation with

    index equals to animationCount().

    \note The group takes ownership of the animation.

    \sa removeAnimation()

*/

void QAnimationGroup::addAnimation(QAbstractAnimation *animation)

{

    Q_D(QAnimationGroup);

    insertAnimation(d->animations.count(), animation);

}

/*!

    Inserts \a animation into this animation group at \a index.

    If \a index is 0 the animation is inserted at the beginning.

    If \a index is animationCount(), the animation is inserted at the end.

    \note The group takes ownership of the animation.

    \sa takeAnimation(), addAnimation(), indexOfAnimation(), removeAnimation()

*/

void QAnimationGroup::insertAnimation(int index, QAbstractAnimation *animation)

{

    Q_D(QAnimationGroup);

    if (index < 0 || index > d->animations.size()) {

        qWarning("QAnimationGroup::insertAnimation: index is out of bounds");

        return;

    }

    if (QAnimationGroup *oldGroup = animation->group())

        oldGroup->removeAnimation(animation);

    d->animations.insert(index, animation);

    QAbstractAnimationPrivate::get(animation)->group = this;

    // this will make sure that ChildAdded event is sent to 'this'

    animation->setParent(this);

    d->animationInsertedAt(index);

}

/*!

    Removes \a animation from this group. The ownership of \a animation is

    transferred to the caller.

    \sa takeAnimation(), insertAnimation(), addAnimation()

*/

void QAnimationGroup::removeAnimation(QAbstractAnimation *animation)

{

    Q_D(QAnimationGroup);

    if (!animation) {

        qWarning("QAnimationGroup::remove: cannot remove null animation");

        return;

    }

    int index = d->animations.indexOf(animation);

    if (index == -1) {

        qWarning("QAnimationGroup::remove: animation is not part of this group");

        return;

    }

    takeAnimation(index);

}

/*!

    Returns the animation at \a index and removes it from the animation group.

    \note The ownership of the animation is transferred to the caller.

    \sa removeAnimation(), addAnimation(), insertAnimation(), indexOfAnimation()

*/

QAbstractAnimation *QAnimationGroup::takeAnimation(int index)

{

    Q_D(QAnimationGroup);

    if (index < 0 || index >= d->animations.size()) {

        qWarning("QAnimationGroup::takeAnimation: no animation at index %d", index);

        return 0;

    }

    QAbstractAnimation *animation = d->animations.at(index);

    QAbstractAnimationPrivate::get(animation)->group = 0;

    // ### removing from list before doing setParent to avoid inifinite recursion

    // in ChildRemoved event

    d->animations.removeAt(index);

    animation->setParent(0);

    d->animationRemoved(index, animation);

    return animation;

}

/*!

    Removes and deletes all animations in this animation group, and resets the current

    time to 0.

    \sa addAnimation(), removeAnimation()

*/

void QAnimationGroup::clear()

{

    Q_D(QAnimationGroup);

    qDeleteAll(d->animations);

}

/*!

    \reimp

*/

bool QAnimationGroup::event(QEvent *event)

{

    Q_D(QAnimationGroup);

    if (event->type() == QEvent::ChildAdded) {

        QChildEvent *childEvent = static_cast<QChildEvent *>(event);

        if (QAbstractAnimation *a = qobject_cast<QAbstractAnimation *>(childEvent->child())) {

            if (a->group() != this)

                addAnimation(a);

        }

    } else if (event->type() == QEvent::ChildRemoved) {

        QChildEvent *childEvent = static_cast<QChildEvent *>(event);

        QAbstractAnimation *a = static_cast<QAbstractAnimation *>(childEvent->child());

        // You can only rely on the child being a QObject because in the QEvent::ChildRemoved

        // case it might be called from the destructor.

        int index = d->animations.indexOf(a);

        if (index != -1)

            takeAnimation(index);

    }

    return QAbstractAnimation::event(event);

}

void QAnimationGroupPrivate::animationRemoved(int index, QAbstractAnimation *)

{

    Q_Q(QAnimationGroup);

    Q_UNUSED(index);

    if (animations.isEmpty()) {

        currentTime = 0;

        q->stop();

    }

}

QT_END_NAMESPACE

#include "moc_qanimationgroup.cpp"

#endif //QT_NO_ANIMATION