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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/qdeclarativebehavior_p.h"
#include "private/qdeclarativeanimation_p.h"
#include "private/qdeclarativetransition_p.h"
#include <qdeclarativecontext.h>
#include <qdeclarativeinfo.h>
#include <qdeclarativeproperty_p.h>
#include <qdeclarativeguard_p.h>
#include <qdeclarativeengine_p.h>
#include <private/qobject_p.h>
QT_BEGIN_NAMESPACE
class QDeclarativeBehaviorPrivate : public QObjectPrivate
{
Q_DECLARE_PUBLIC(QDeclarativeBehavior)
public:
QDeclarativeBehaviorPrivate() : animation(0), enabled(true), finalized(false) {}
QDeclarativeProperty property;
QVariant currentValue;
QVariant targetValue;
QDeclarativeGuard<QDeclarativeAbstractAnimation> animation;
bool enabled;
bool finalized;
};
/*!
\qmlclass Behavior QDeclarativeBehavior
\since 4.7
\brief The Behavior element allows you to specify a default animation for a property change.
Behaviors provide one way to specify \l{qdeclarativeanimation.html}{animations} in QML.
In the example below, the rectangle will use a bounce easing curve over 200 millisecond for any changes to its y property:
\code
Rectangle {
width: 20; height: 20
color: "#00ff00"
y: 200 // initial value
Behavior on y {
NumberAnimation {
easing.type: Easing.OutBounce
easing.amplitude: 100
duration: 200
}
}
}
\endcode
Currently only a single Behavior may be specified for a property;
this Behavior can be enabled and disabled via the \l{enabled} property.
\sa {declarative/animation/behaviors}{Behavior example}, QtDeclarative
*/
QDeclarativeBehavior::QDeclarativeBehavior(QObject *parent)
: QObject(*(new QDeclarativeBehaviorPrivate), parent)
{
}
QDeclarativeBehavior::~QDeclarativeBehavior()
{
}
/*!
\qmlproperty Animation Behavior::animation
\default
The animation to use when the behavior is triggered.
*/
QDeclarativeAbstractAnimation *QDeclarativeBehavior::animation()
{
Q_D(QDeclarativeBehavior);
return d->animation;
}
void QDeclarativeBehavior::setAnimation(QDeclarativeAbstractAnimation *animation)
{
Q_D(QDeclarativeBehavior);
if (d->animation) {
qmlInfo(this) << tr("Cannot change the animation assigned to a Behavior.");
return;
}
d->animation = animation;
if (d->animation) {
d->animation->setDefaultTarget(d->property);
d->animation->setDisableUserControl();
}
}
/*!
\qmlproperty bool Behavior::enabled
Whether the Behavior will be triggered when the property it is tracking changes.
By default a Behavior is enabled.
*/
bool QDeclarativeBehavior::enabled() const
{
Q_D(const QDeclarativeBehavior);
return d->enabled;
}
void QDeclarativeBehavior::setEnabled(bool enabled)
{
Q_D(QDeclarativeBehavior);
if (d->enabled == enabled)
return;
d->enabled = enabled;
emit enabledChanged();
}
void QDeclarativeBehavior::write(const QVariant &value)
{
Q_D(QDeclarativeBehavior);
qmlExecuteDeferred(this);
if (!d->animation || !d->enabled || !d->finalized) {
QDeclarativePropertyPrivate::write(d->property, value, QDeclarativePropertyPrivate::BypassInterceptor | QDeclarativePropertyPrivate::DontRemoveBinding);
d->targetValue = value;
return;
}
if (value == d->targetValue)
return;
d->currentValue = d->property.read();
d->targetValue = value;
if (d->animation->qtAnimation()->duration() != -1)
d->animation->qtAnimation()->stop();
QDeclarativeStateOperation::ActionList actions;
QDeclarativeAction action;
action.property = d->property;
action.fromValue = d->currentValue;
action.toValue = value;
actions << action;
QList<QDeclarativeProperty> after;
d->animation->transition(actions, after, QDeclarativeAbstractAnimation::Forward);
d->animation->qtAnimation()->start();
if (!after.contains(d->property))
QDeclarativePropertyPrivate::write(d->property, value, QDeclarativePropertyPrivate::BypassInterceptor | QDeclarativePropertyPrivate::DontRemoveBinding);
}
void QDeclarativeBehavior::setTarget(const QDeclarativeProperty &property)
{
Q_D(QDeclarativeBehavior);
d->property = property;
d->currentValue = property.read();
if (d->animation)
d->animation->setDefaultTarget(property);
QDeclarativeEnginePrivate *engPriv = QDeclarativeEnginePrivate::get(qmlEngine(this));
engPriv->registerFinalizedParserStatusObject(this, this->metaObject()->indexOfSlot("componentFinalized()"));
}
void QDeclarativeBehavior::componentFinalized()
{
Q_D(QDeclarativeBehavior);
d->finalized = true;
}
QT_END_NAMESPACE
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