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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::load(QSGParticleData* d)
{
Q_ASSERT(d);
int pos = particleTypeIndex(d);
m_data[pos] = d;
m_loadables << pos;
}
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_items[pos]))
qWarning() << "Current model particles prefers overwrite:false";
//remove old item from the particle that is dying to make room for this one
if(m_items[pos]){
m_deletables << m_items[pos];
m_activeCount--;
}
m_items[pos] = 0;
if(!m_pendingItems.isEmpty()){
m_items[pos] = m_pendingItems.front();
m_pendingItems.pop_front();
}else if(m_delegate){
m_items[pos] = qobject_cast<QSGItem*>(m_delegate->create(qmlContext(this)));
}
if(m_items[pos] && m_data[pos]){//###Data can be zero if creating an item leads to a reset - this screws things up.
m_items[pos]->setX(m_data[pos]->curX() - m_items[pos]->width()/2);//TODO: adjust for system?
m_items[pos]->setY(m_data[pos]->curY() - m_items[pos]->height()/2);
QSGItemParticleAttached* mpa = qobject_cast<QSGItemParticleAttached*>(qmlAttachedPropertiesObject<QSGItemParticle>(m_items[pos]));
if(mpa){
mpa->m_mp = this;
mpa->attach();
}
m_items[pos]->setParentItem(this);
if(m_fade)
m_items[pos]->setOpacity(0.);
m_activeCount++;
}
}
m_loadables.clear();
}
void QSGItemParticle::reload(QSGParticleData* d)
{
//No-op unless we start copying the data.
}
void QSGItemParticle::resize(int oldCount, int newCount)
{
if(!m_system)
return;
groupShuffle(m_items, (QSGItem*)0);
groupShuffle(m_data, (QSGParticleData*)0);
}
void QSGItemParticle::reset()
{
QSGParticlePainter::reset();
//TODO: Cleanup items?
m_items.fill(0);
m_data.fill(0);
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++){
QSGItem* item = m_items[i];
QSGParticleData* data = m_data[i];
if(!item || !data)
continue;
qreal t = ((timeStamp/1000.0) - data->pv.t) / data->pv.lifeSpan;
if(m_stasis.contains(item)) {
m_data[i]->pv.t += dt;//Stasis effect
continue;
}
if(t >= 1.0){//Usually happens from load
m_deletables << item;
m_items[i] = 0;
m_data[i] = 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);
item->setY(data->curY() - item->height()/2);
}
}
QSGItemParticleAttached *QSGItemParticle::qmlAttachedProperties(QObject *object)
{
return new QSGItemParticleAttached(object);
}
QT_END_NAMESPACE
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