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/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtCore 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.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
/*!
\class QPropertyAnimation
\brief The QPropertyAnimation class animates Qt properties
\since 4.6
\ingroup animation
QPropertyAnimation interpolates over \l{Qt's Property System}{Qt
properties}. As property values are stored in \l{QVariant}s, the
class inherits QVariantAnimation, and supports animation of the
same \l{QVariant::Type}{variant types} as its super class.
A class declaring properties must be a QObject. To make it
possible to animate a property, it must provide a setter (so that
QPropertyAnimation can set the property's value). Note that this
makes it possible to animate many of Qt's widgets. Let's look at
an example:
\code
QPropertyAnimation animation(myWidget, "geometry");
animation.setDuration(10000);
animation.setStartValue(QRect(0, 0, 100, 30));
animation.setEndValue(QRect(250, 250, 100, 30));
animation.start();
\endcode
The property name and the QObject instance of which property
should be animated are passed to the constructor. You can then
specify the start and end value of the property. The procedure is
equal for properties in classes you have implemented
yourself--just check with QVariantAnimation that your QVariant
type is supported.
The QVariantAnimation class description explains how to set up the
animation in detail. Note, however, that if a start value is not
set, the property will start at the value it had when the
QPropertyAnimation instance was created.
QPropertyAnimation works like a charm on its own. For complex
animations that, for instance, contain several objects,
QAnimationGroup is provided. An animation group is an animation
that can contain other animations, and that can manage when its
animations are played. Look at QParallelAnimationGroup for an
example.
\sa QVariantAnimation, QAnimationGroup, {The Animation Framework}
*/
#include "qpropertyanimation.h"
#include "qanimationgroup.h"
#include "qpropertyanimation_p.h"
#include <private/qmutexpool_p.h>
#ifndef QT_NO_ANIMATION
QT_BEGIN_NAMESPACE
void QPropertyAnimationPrivate::updateMetaProperty()
{
if (!target || propertyName.isEmpty()) {
propertyType = QVariant::Invalid;
propertyIndex = -1;
return;
}
propertyType = targetValue->property(propertyName).userType();
propertyIndex = targetValue->metaObject()->indexOfProperty(propertyName);
if (propertyIndex == -1 && !targetValue->dynamicPropertyNames().contains(propertyName))
qWarning("QPropertyAnimation: you're trying to animate a non-existing property %s of your QObject", propertyName.constData());
if (propertyType != QVariant::Invalid)
convertValues(propertyType);
}
void QPropertyAnimationPrivate::updateProperty(const QVariant &newValue)
{
if (state == QAbstractAnimation::Stopped)
return;
if (!target) {
q_func()->stop(); //the target was destroyed we need to stop the animation
return;
}
if (propertyIndex != -1 && newValue.userType() == propertyType) {
//no conversion is needed, we directly call the QObject::qt_metacall
void *data = const_cast<void*>(newValue.constData());
targetValue->qt_metacall(QMetaObject::WriteProperty, propertyIndex, &data);
} else {
targetValue->setProperty(propertyName.constData(), newValue);
}
}
/*!
Construct a QPropertyAnimation object. \a parent is passed to QObject's
constructor.
*/
QPropertyAnimation::QPropertyAnimation(QObject *parent)
: QVariantAnimation(*new QPropertyAnimationPrivate, parent)
{
}
/*!
Construct a QPropertyAnimation object. \a parent is passed to QObject's
constructor. The animation changes the property \a propertyName on \a
target. The default duration is 250ms.
\sa targetObject, propertyName
*/
QPropertyAnimation::QPropertyAnimation(QObject *target, const QByteArray &propertyName, QObject *parent)
: QVariantAnimation(*new QPropertyAnimationPrivate, parent)
{
setTargetObject(target);
setPropertyName(propertyName);
}
/*!
Destroys the QPropertyAnimation instance.
*/
QPropertyAnimation::~QPropertyAnimation()
{
stop();
}
/*!
\property QPropertyAnimation::targetObject
\brief the target QObject for this animation.
This property defines the target QObject for this animation.
*/
QObject *QPropertyAnimation::targetObject() const
{
return d_func()->target.data();
}
void QPropertyAnimation::setTargetObject(QObject *target)
{
Q_D(QPropertyAnimation);
if (d->targetValue == target)
return;
if (d->state != QAbstractAnimation::Stopped) {
qWarning("QPropertyAnimation::setTargetObject: you can't change the target of a running animation");
return;
}
d->target = d->targetValue = target;
d->updateMetaProperty();
}
/*!
\property QPropertyAnimation::propertyName
\brief the target property name for this animation
This property defines the target property name for this animation. The
property name is required for the animation to operate.
*/
QByteArray QPropertyAnimation::propertyName() const
{
Q_D(const QPropertyAnimation);
return d->propertyName;
}
void QPropertyAnimation::setPropertyName(const QByteArray &propertyName)
{
Q_D(QPropertyAnimation);
if (d->state != QAbstractAnimation::Stopped) {
qWarning("QPropertyAnimation::setPropertyName: you can't change the property name of a running animation");
return;
}
d->propertyName = propertyName;
d->updateMetaProperty();
}
/*!
\reimp
*/
bool QPropertyAnimation::event(QEvent *event)
{
return QVariantAnimation::event(event);
}
/*!
This virtual function is called by QVariantAnimation whenever the current value
changes. \a value is the new, updated value. It updates the current value
of the property on the target object.
\sa currentValue, currentTime
*/
void QPropertyAnimation::updateCurrentValue(const QVariant &value)
{
Q_D(QPropertyAnimation);
d->updateProperty(value);
}
/*!
\reimp
If the startValue is not defined when the state of the animation changes from Stopped to Running,
the current property value is used as the initial value for the animation.
*/
void QPropertyAnimation::updateState(QAbstractAnimation::State oldState,
QAbstractAnimation::State newState)
{
Q_D(QPropertyAnimation);
if (!d->target && oldState == Stopped) {
qWarning("QPropertyAnimation::updateState: Changing state of an animation without target");
return;
}
QVariantAnimation::updateState(oldState, newState);
QPropertyAnimation *animToStop = 0;
{
QMutexLocker locker(QMutexPool::globalInstanceGet(&staticMetaObject));
typedef QPair<QObject *, QByteArray> QPropertyAnimationPair;
typedef QHash<QPropertyAnimationPair, QPropertyAnimation*> QPropertyAnimationHash;
static QPropertyAnimationHash hash;
//here we need to use value because we need to know to which pointer
//the animation was referring in case stopped because the target was destroyed
QPropertyAnimationPair key(d->targetValue, d->propertyName);
if (newState == Running) {
d->updateMetaProperty();
animToStop = hash.value(key, 0);
hash.insert(key, this);
// update the default start value
if (oldState == Stopped) {
d->setDefaultStartEndValue(d->targetValue->property(d->propertyName.constData()));
//let's check if we have a start value and an end value
if (d->direction == Forward && !startValue().isValid() && !d->defaultStartEndValue.isValid())
qWarning("QPropertyAnimation::updateState: starting an animation without start value");
if (d->direction == Backward && !endValue().isValid() && !d->defaultStartEndValue.isValid())
qWarning("QPropertyAnimation::updateState: starting an animation without end value");
}
} else if (hash.value(key) == this) {
hash.remove(key);
}
}
//we need to do that after the mutex was unlocked
if (animToStop) {
// try to stop the top level group
QAbstractAnimation *current = animToStop;
while (current->group() && current->state() != Stopped)
current = current->group();
current->stop();
}
}
#include "moc_qpropertyanimation.cpp"
QT_END_NAMESPACE
#endif //QT_NO_ANIMATION
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