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/****************************************************************************
**
** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/
**
** This file is part of the QtQml module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** GNU Lesser General Public License Usage
** 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.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU General
** Public License version 3.0 as published by the Free Software Foundation
** and appearing in the file LICENSE.GPL included in the packaging of this
** file. Please review the following information to ensure the GNU General
** Public License version 3.0 requirements will be met:
** http://www.gnu.org/copyleft/gpl.html.
**
** Other Usage
** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qquickbehavior_p.h"
#include "qquickanimation_p.h"
#include <qqmlcontext.h>
#include <qqmlinfo.h>
#include <private/qqmlproperty_p.h>
#include <private/qqmlguard_p.h>
#include <private/qqmlengine_p.h>
#include <private/qabstractanimationjob_p.h>
#include <private/qquicktransition_p.h>
#include <private/qobject_p.h>
QT_BEGIN_NAMESPACE
class QQuickBehaviorPrivate : public QObjectPrivate, public QAnimationJobChangeListener
{
Q_DECLARE_PUBLIC(QQuickBehavior)
public:
QQuickBehaviorPrivate() : animation(0), animationInstance(0), enabled(true), finalized(false)
, blockRunningChanged(false) {}
virtual void animationStateChanged(QAbstractAnimationJob *, QAbstractAnimationJob::State newState, QAbstractAnimationJob::State oldState);
QQmlProperty property;
QVariant targetValue;
QQmlGuard<QQuickAbstractAnimation> animation;
QAbstractAnimationJob *animationInstance;
bool enabled;
bool finalized;
bool blockRunningChanged;
};
/*!
\qmltype Behavior
\instantiates QQuickBehavior
\inqmlmodule QtQuick 2
\ingroup qtquick-transitions-animations
\ingroup qtquick-interceptors
\brief Defines a default animation for a property change
A Behavior defines the default animation to be applied whenever a
particular property value changes.
For example, the following Behavior defines a NumberAnimation to be run
whenever the \l Rectangle's \c width value changes. When the MouseArea
is clicked, the \c width is changed, triggering the behavior's animation:
\snippet qml/behavior.qml 0
Note that a property cannot have more than one assigned Behavior. To provide
multiple animations within a Behavior, use ParallelAnimation or
SequentialAnimation.
If a \l{Qt Quick States}{state change} has a \l Transition that matches the same property as a
Behavior, the \l Transition animation overrides the Behavior for that
state change. For general advice on using Behaviors to animate state changes, see
\l{Using Qt Quick Behaviors with States}.
\sa {Animation and Transitions in Qt Quick}, {declarative/animation/behaviors}{Behavior example}, QtQml
*/
QQuickBehavior::QQuickBehavior(QObject *parent)
: QObject(*(new QQuickBehaviorPrivate), parent)
{
}
QQuickBehavior::~QQuickBehavior()
{
Q_D(QQuickBehavior);
delete d->animationInstance;
}
/*!
\qmlproperty Animation QtQuick2::Behavior::animation
\default
This property holds the animation to run when the behavior is triggered.
*/
QQuickAbstractAnimation *QQuickBehavior::animation()
{
Q_D(QQuickBehavior);
return d->animation;
}
void QQuickBehavior::setAnimation(QQuickAbstractAnimation *animation)
{
Q_D(QQuickBehavior);
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();
}
}
void QQuickBehaviorPrivate::animationStateChanged(QAbstractAnimationJob *, QAbstractAnimationJob::State newState,QAbstractAnimationJob::State)
{
if (!blockRunningChanged)
animation->notifyRunningChanged(newState == QAbstractAnimationJob::Running);
}
/*!
\qmlproperty bool QtQuick2::Behavior::enabled
This property holds whether the behavior will be triggered when the tracked
property changes value.
By default a Behavior is enabled.
*/
bool QQuickBehavior::enabled() const
{
Q_D(const QQuickBehavior);
return d->enabled;
}
void QQuickBehavior::setEnabled(bool enabled)
{
Q_D(QQuickBehavior);
if (d->enabled == enabled)
return;
d->enabled = enabled;
emit enabledChanged();
}
void QQuickBehavior::write(const QVariant &value)
{
Q_D(QQuickBehavior);
bool bypass = !d->enabled || !d->finalized;
if (!bypass)
qmlExecuteDeferred(this);
if (!d->animation || bypass) {
QQmlPropertyPrivate::write(d->property, value, QQmlPropertyPrivate::BypassInterceptor | QQmlPropertyPrivate::DontRemoveBinding);
d->targetValue = value;
return;
}
if (d->animation->isRunning() && value == d->targetValue)
return;
const QVariant ¤tValue = d->property.read();
d->targetValue = value;
if (d->animationInstance && d->animationInstance->duration() != -1
&& !d->animationInstance->isStopped()) {
d->blockRunningChanged = true;
d->animationInstance->stop();
}
QQuickStateOperation::ActionList actions;
QQuickAction action;
action.property = d->property;
action.fromValue = currentValue;
action.toValue = value;
actions << action;
QList<QQmlProperty> after;
QAbstractAnimationJob *prev = d->animationInstance;
d->animationInstance = d->animation->transition(actions, after, QQuickAbstractAnimation::Forward);
if (prev && prev != d->animationInstance)
delete prev;
if (d->animationInstance) {
if (d->animationInstance != prev)
d->animationInstance->addAnimationChangeListener(d, QAbstractAnimationJob::StateChange);
d->animationInstance->start();
d->blockRunningChanged = false;
}
if (!after.contains(d->property))
QQmlPropertyPrivate::write(d->property, value, QQmlPropertyPrivate::BypassInterceptor | QQmlPropertyPrivate::DontRemoveBinding);
}
void QQuickBehavior::setTarget(const QQmlProperty &property)
{
Q_D(QQuickBehavior);
d->property = property;
if (d->animation)
d->animation->setDefaultTarget(property);
QQmlEnginePrivate *engPriv = QQmlEnginePrivate::get(qmlEngine(this));
static int finalizedIdx = -1;
if (finalizedIdx < 0)
finalizedIdx = metaObject()->indexOfSlot("componentFinalized()");
engPriv->registerFinalizeCallback(this, finalizedIdx);
}
void QQuickBehavior::componentFinalized()
{
Q_D(QQuickBehavior);
d->finalized = true;
}
QT_END_NAMESPACE
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