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/****************************************************************************
**
** Copyright (C) 2009 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 <qmlbinding.h>
#include <private/qmltransitionmanager_p_p.h>
#include <private/qmlstate_p_p.h>
QT_BEGIN_NAMESPACE
class QmlTransitionManagerPrivate
{
public:
QmlTransitionManagerPrivate()
: state(0), transition(0) {}
void applyBindings();
typedef QList<SimpleAction> SimpleActionList;
QmlState *state;
QmlTransition *transition;
QmlStateOperation::ActionList bindingsList;
SimpleActionList completeList;
};
QmlTransitionManager::QmlTransitionManager()
: d(new QmlTransitionManagerPrivate)
{
}
void QmlTransitionManager::setState(QmlState *s)
{
d->state = s;
}
QmlTransitionManager::~QmlTransitionManager()
{
delete d; d = 0;
}
void QmlTransitionManager::complete()
{
d->applyBindings();
for (int ii = 0; ii < d->completeList.count(); ++ii) {
const QmlMetaProperty &prop = d->completeList.at(ii).property;
prop.write(d->completeList.at(ii).value);
}
d->completeList.clear();
if (d->state)
static_cast<QmlStatePrivate*>(QObjectPrivate::get(d->state))->complete();
}
void QmlTransitionManagerPrivate::applyBindings()
{
foreach(const Action &action, bindingsList) {
if (action.toBinding) {
action.property.setBinding(action.toBinding);
} else if (action.event) {
if (action.reverseEvent)
action.event->reverse();
else
action.event->execute();
}
}
bindingsList.clear();
}
void QmlTransitionManager::transition(const QList<Action> &list,
QmlTransition *transition)
{
cancel();
QmlStateOperation::ActionList applyList = list;
// Determine which actions are binding changes.
foreach(const Action &action, applyList) {
if (action.toBinding)
d->bindingsList << action;
if (action.fromBinding)
action.property.setBinding(0); // Disable current binding
if (action.event && action.event->changesBindings()) { //### assume isReversable()?
d->bindingsList << action;
if (action.reverseEvent)
action.event->clearReverseBindings();
else
action.event->clearForwardBindings();
}
}
// Animated transitions need both the start and the end value for
// each property change. In the presence of bindings, the end values
// are non-trivial to calculate. As a "best effort" attempt, we first
// apply all the property and binding changes, then read all the actual
// final values, then roll back the changes and proceed as normal.
//
// This doesn't catch everything, and it might be a little fragile in
// some cases - but whatcha going to do?
if (!d->bindingsList.isEmpty()) {
//### do extra actions here?
// Apply all the property and binding changes
for (int ii = 0; ii < applyList.size(); ++ii) {
const Action &action = applyList.at(ii);
if (action.toBinding) {
action.property.setBinding(action.toBinding, QmlMetaProperty::BypassInterceptor | QmlMetaProperty::DontRemoveBinding);
} else if (!action.event) {
action.property.write(action.toValue, QmlMetaProperty::BypassInterceptor | QmlMetaProperty::DontRemoveBinding);
} else if (action.event->isReversable()) {
if (action.reverseEvent)
action.event->reverse();
else
action.event->execute();
applyList << action.event->extraActions();
}
}
// Read all the end values for binding changes
for (int ii = 0; ii < applyList.size(); ++ii) {
Action *action = &applyList[ii];
if (action->event)
continue;
const QmlMetaProperty &prop = action->property;
if (action->toBinding || !action->toValue.isValid()) { //### is this always right (used for exta actions)
action->toValue = prop.read();
}
}
// Revert back to the original values
foreach(const Action &action, applyList) {
if (action.event) {
if (action.event->isReversable()) {
if (action.reverseEvent) { //reverse the reverse
action.event->clearForwardBindings();
action.event->rewind();
action.event->clearReverseBindings();
} else {
action.event->clearReverseBindings();
action.event->rewind();
action.event->clearForwardBindings();
}
}
continue;
}
if (action.toBinding)
action.property.setBinding(0); // Make sure this is disabled during the transition
action.property.write(action.fromValue, QmlMetaProperty::BypassInterceptor | QmlMetaProperty::DontRemoveBinding);
}
}
if (transition) {
QList<QmlMetaProperty> touched;
d->transition = transition;
d->transition->prepare(applyList, touched, this);
// Modify the action list to remove actions handled in the transition
for (int ii = 0; ii < applyList.count(); ++ii) {
const Action &action = applyList.at(ii);
if (action.event) {
if (action.actionDone) {
applyList.removeAt(ii);
--ii;
}
} else {
if (touched.contains(action.property)) {
if (action.toValue != action.fromValue)
d->completeList <<
SimpleAction(action, SimpleAction::EndState);
applyList.removeAt(ii);
--ii;
}
}
}
}
// Any actions remaining have not been handled by the transition and should
// be applied immediately. We skip applying bindings, as they are all
// applied at the end in applyBindings() to avoid any nastiness mid
// transition
foreach(const Action &action, applyList) {
if (action.event && !action.event->changesBindings()) {
if (action.event->isReversable() && action.reverseEvent)
action.event->reverse();
else
action.event->execute();
} else if (!action.event && !action.toBinding) {
action.property.write(action.toValue);
}
}
if (!transition)
d->applyBindings();
}
void QmlTransitionManager::cancel()
{
if (d->transition) {
// ### this could potentially trigger a complete in rare circumstances
d->transition->stop();
d->transition = 0;
}
for(int i = 0; i < d->bindingsList.count(); ++i) {
Action action = d->bindingsList[i];
if (action.toBinding && action.deletableToBinding) {
action.property.setBinding(0);
delete action.toBinding;
action.toBinding = 0;
action.deletableToBinding = false;
} else if (action.event) {
//### what do we do here?
}
}
d->bindingsList.clear();
d->completeList.clear();
}
QT_END_NAMESPACE
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