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+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the Declarative 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 "qsgitemparticle_p.h"
+#include <QtDeclarative/private/qsgvisualitemmodel_p.h>
+#include <qsgnode.h>
+#include <QTimer>
+#include <QDeclarativeComponent>
+#include <QDebug>
+
+QT_BEGIN_NAMESPACE
+
+QSGItemParticle::QSGItemParticle(QSGItem *parent) :
+ QSGParticlePainter(parent), m_fade(true), m_delegate(0)
+{
+ setFlag(QSGItem::ItemHasContents);
+ QTimer* manageDelegates = new QTimer(this);//TODO: don't leak
+ connect(manageDelegates, SIGNAL(timeout()),
+ this, SLOT(tick()));
+ manageDelegates->setInterval(16);
+ manageDelegates->setSingleShot(false);
+ manageDelegates->start();
+}
+
+
+void QSGItemParticle::freeze(QSGItem* item)
+{
+ m_stasis << item;
+}
+
+
+void QSGItemParticle::unfreeze(QSGItem* item)
+{
+ m_stasis.remove(item);
+}
+
+void QSGItemParticle::take(QSGItem *item, bool prioritize)
+{
+ if(prioritize)
+ m_pendingItems.push_front(item);
+ else
+ m_pendingItems.push_back(item);
+}
+
+void QSGItemParticle::give(QSGItem *item)
+{
+ //TODO: This
+}
+
+void QSGItemParticle::initialize(int idx)
+{
+ m_loadables << idx;//defer to other thread
+}
+
+void QSGItemParticle::reload(int idx)
+{
+}
+
+void QSGItemParticle::tick()
+{
+ foreach(QSGItem* item, m_deletables){
+ if(m_fade)
+ item->setOpacity(0.);
+ QSGItemParticleAttached* mpa;
+ if((mpa = qobject_cast<QSGItemParticleAttached*>(qmlAttachedPropertiesObject<QSGItemParticle>(item))))
+ mpa->detach();//reparent as well?
+ //TODO: Delete iff we created it
+ m_activeCount--;
+ }
+ m_deletables.clear();
+
+ foreach(int pos, m_loadables){
+ if(m_stasis.contains(m_data[pos]->delegate))
+ qWarning() << "Current model particles prefers overwrite:false";
+ //remove old item from the particle that is dying to make room for this one
+ if(m_data[pos]->delegate){
+ m_deletables << m_data[pos]->delegate;
+ m_activeCount--;
+ }
+ m_data[pos]->delegate = 0;
+ if(!m_pendingItems.isEmpty()){
+ m_data[pos]->delegate = m_pendingItems.front();
+ m_pendingItems.pop_front();
+ }else if(m_delegate){
+ m_data[pos]->delegate = qobject_cast<QSGItem*>(m_delegate->create(qmlContext(this)));
+ }
+ if(m_data[pos]->delegate && m_data[pos]){//###Data can be zero if creating an item leads to a reset - this screws things up.
+ m_data[pos]->delegate->setX(m_data[pos]->curX() - m_data[pos]->delegate->width()/2);//TODO: adjust for system?
+ m_data[pos]->delegate->setY(m_data[pos]->curY() - m_data[pos]->delegate->height()/2);
+ QSGItemParticleAttached* mpa = qobject_cast<QSGItemParticleAttached*>(qmlAttachedPropertiesObject<QSGItemParticle>(m_data[pos]->delegate));
+ if(mpa){
+ mpa->m_mp = this;
+ mpa->attach();
+ }
+ m_data[pos]->delegate->setParentItem(this);
+ if(m_fade)
+ m_data[pos]->delegate->setOpacity(0.);
+ m_activeCount++;
+ }
+ }
+ m_loadables.clear();
+}
+
+void QSGItemParticle::reset()
+{
+ QSGParticlePainter::reset();
+ //TODO: Cleanup items?
+ m_loadables.clear();
+ //deletables?
+}
+
+
+QSGNode* QSGItemParticle::updatePaintNode(QSGNode* n, UpdatePaintNodeData* d)
+{
+ //Dummy update just to get painting tick
+ if(m_pleaseReset){
+ m_pleaseReset = false;
+ reset();
+ }
+ prepareNextFrame();
+
+ update();//Get called again
+ if(n)
+ n->markDirty(QSGNode::DirtyMaterial);
+ return QSGItem::updatePaintNode(n,d);
+}
+
+void QSGItemParticle::prepareNextFrame()
+{
+ qint64 timeStamp = m_system->systemSync(this);
+ qreal curT = timeStamp/1000.0;
+ qreal dt = curT - m_lastT;
+ m_lastT = curT;
+ if(!m_activeCount)
+ return;
+
+ //TODO: Size, better fade?
+ for(int i=0; i<count(); i++){
+ QSGParticleData* data = m_data[i];
+ QSGItem* item = data->delegate;
+ if(!item)
+ continue;
+ qreal t = ((timeStamp/1000.0) - data->t) / data->lifeSpan;
+ if(m_stasis.contains(item)) {
+ m_data[i]->t += dt;//Stasis effect
+ continue;
+ }
+ if(t >= 1.0){//Usually happens from load
+ m_deletables << item;
+ m_data[i]->delegate = 0;
+ m_activeCount--;
+ }else{//Fade
+ if(m_fade){
+ qreal o = 1.;
+ if(t<0.2)
+ o = t*5;
+ if(t>0.8)
+ o = (1-t)*5;
+ item->setOpacity(o);
+ }else{
+ item->setOpacity(1.);//###Without fade, it's just a binary toggle - if we turn it off we have to turn it back on
+ }
+ }
+ item->setX(data->curX() - item->width()/2 - m_systemOffset.x());
+ item->setY(data->curY() - item->height()/2 - m_systemOffset.y());
+ }
+}
+
+QSGItemParticleAttached *QSGItemParticle::qmlAttachedProperties(QObject *object)
+{
+ return new QSGItemParticleAttached(object);
+}
+
+QT_END_NAMESPACE