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+/****************************************************************************
+**
+** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtDeclarative module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, 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 qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#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.
+
+    A Transition defines the animations to be applied when a \l State change occurs.
+
+    For example, the following \l Rectangle has two states: the default state, and
+    an added "moved" state. In the "moved state, the rectangle's position changes 
+    to (50, 50).  The added \l Transition specifies that when the rectangle
+    changes between the default and the "moved" state, any changes
+    to the \c x and \c y properties should be animated, using an \c Easing.InOutQuad.
+   
+    \snippet doc/src/snippets/declarative/transition.qml 0
+
+    Items can have multiple transitions, if 
+
+    To specify multiple transitions, specify \l Item::transitions as a list:
+
+    \qml
+    Item {
+        ...
+        transitions: [
+            Transition { ... }
+            Transition { ... }
+        ]
+    }
+    \endqml
+
+    \sa {declarative/animation/states}{states example}, {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 indicate the state changes that trigger the transition.
+
+    The default values for these properties is "*" (that is, any state).
+
+    For example, the following transition has not set the \c to and \c from
+    properties, so the animation is always applied when changing between
+    the two states (i.e. when the mouse is pressed and released).
+
+    \snippet doc/src/snippets/declarative/transition-from-to.qml 0
+
+    If the transition was changed to this:
+
+    \qml
+        transitions: Transition { 
+            to: "brighter"
+            ColorAnimation { duration: 1000 }
+        }
+    }
+    \endqml
+
+    The animation would only be applied when changing from the default state to
+    the "brighter" state (i.e. when the mouse is pressed, but not on release).
+
+    \sa reversible
+*/
+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.
+
+    By default, transitions run in parallel and are applied to all state
+    changes if the \l from and \l to states have not been set. In this
+    situation, the transition is automatically applied when a state change
+    is reversed, and it is not necessary to set this property to reverse
+    the transition.
+
+    However, if a SequentialAnimation is used, or if the \l from or \l to 
+    properties have been set, this property will need to be set to reverse
+    a transition when a state change is reverted. For example, the following
+    transition applies a sequential animation when the mouse is pressed,
+    and reverses the sequence of the animation when the mouse is released:
+
+    \snippet doc/src/snippets/declarative/transition-reversible.qml 0
+
+    If the transition did not set the \c to and \c reversible values, then 
+    on the mouse release, the transition would play the PropertyAnimation
+    before the ColorAnimation instead of reversing the sequence.
+*/
+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.
+
+    \qml
+    Transition {
+        PropertyAnimation { ... }
+        NumberAnimation { ... }
+    }
+    \endqml
+
+    The top-level animations are run in parallel. To run them sequentially,
+    define them within a SequentialAnimation:
+
+    \qml
+    Transition {
+        SequentialAnimation {
+            PropertyAnimation { ... }
+            NumberAnimation { ... }
+        }
+    }
+    \endqml
+*/
+QDeclarativeListProperty<QDeclarativeAbstractAnimation> QDeclarativeTransition::animations()
+{
+    Q_D(QDeclarativeTransition);
+    return QDeclarativeListProperty<QDeclarativeAbstractAnimation>(this, &d->animations, QDeclarativeTransitionPrivate::append_animation);
+}
+
+QT_END_NAMESPACE
+
+#include <qdeclarativetransition.moc>