Say hello to QtQuick module

This change moves the QtQuick 2 types and C++ API (including
SceneGraph) to a new module (AKA library), QtQuick.

99% of this change is moving files from src/declarative to
src/quick, and from tests/auto/declarative to
tests/auto/qtquick2.

The loading of QtQuick 2 ("import QtQuick 2.0") is now delegated to
a plugin, src/imports/qtquick2, just like it's done for QtQuick 1.

All tools, examples, and tests that use QtQuick C++ API have gotten
"QT += quick" or "QT += quick-private" added to their .pro file.

A few additional internal QtDeclarative classes had to be exported
(via Q_DECLARATIVE_PRIVATE_EXPORT) since they're needed by the
QtQuick 2 implementation.

The old header locations (e.g. QtDeclarative/qquickitem.h) will
still be supported for some time, but will produce compile-time
warnings. (To avoid the QtQuick implementation using the
compatibility headers (since QtDeclarative's includepath comes
first), a few include statements were modified, e.g. from
"#include <qsgnode.h>" to "#include <QtQuick/qsgnode.h>".)

There's a change in qtbase that automatically adds QtQuick to the
module list if QtDeclarative is used. Together with the compatibility
headers, this should help reduce the migration pain for existing
projects.

In theory, simply getting an existing QtDeclarative-based project
to compile and link shouldn't require any changes for now -- but
porting to the new scheme is of course recommended, and will
eventually become mandatory.

Task-number: QTBUG-22889
Reviewed-by: Lars Knoll <lars.knoll@nokia.com>
Change-Id: Ia52be9373172ba2f37e7623231ecb060316c96a7
Reviewed-by: Kent Hansen <kent.hansen@nokia.com>
Reviewed-by: Sergio Ahumada <sergio.ahumada@nokia.com>

1 files changed, 285 insertions, 0 deletions

diff --git a/src/quick/particles/qquicktrailemitter.cpp b/src/quick/particles/qquicktrailemitter.cpp
new file mode 100644
index 0000000000..272a3ebf84
--- /dev/null
+++ b/src/quick/particles/qquicktrailemitter.cpp
@@ -0,0 +1,285 @@
+/****************************************************************************
+**
+** 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.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** 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 "qquicktrailemitter_p.h"
+#include <private/qdeclarativeengine_p.h>
+#include <cmath>
+QT_BEGIN_NAMESPACE
+
+/*!
+    \qmlclass TrailEmitter QQuickTrailEmitter
+    \inqmlmodule QtQuick.Particles 2
+    \inherits QQuickParticleEmitter
+    \brief The TrailEmitter element allows you to emit logical particles from other logical particles.
+
+    This element emits logical particles into the ParticleSystem, with the
+    starting positions based on those of other logical particles.
+*/
+QQuickTrailEmitter::QQuickTrailEmitter(QQuickItem *parent) :
+    QQuickParticleEmitter(parent)
+  , m_particlesPerParticlePerSecond(0)
+  , m_lastTimeStamp(0)
+  , m_emitterXVariation(0)
+  , m_emitterYVariation(0)
+  , m_followCount(0)
+  , m_emissionExtruder(0)
+  , m_defaultEmissionExtruder(new QQuickParticleExtruder(this))
+{
+    //TODO: If followed increased their size
+    connect(this, SIGNAL(followChanged(QString)),
+            this, SLOT(recalcParticlesPerSecond()));
+    connect(this, SIGNAL(particleDurationChanged(int)),
+            this, SLOT(recalcParticlesPerSecond()));
+    connect(this, SIGNAL(particlesPerParticlePerSecondChanged(int)),
+            this, SLOT(recalcParticlesPerSecond()));
+}
+
+/*!
+    \qmlproperty string QtQuick.Particles2::TrailEmitter::follow
+
+    The type of logical particle which this is emitting from.
+*/
+/*!
+    \qmlproperty qreal QtQuick.Particles2::TrailEmitter::speedFromMovement
+
+    If this value is non-zero, then any movement of the emitter will provide additional
+    starting velocity to the particles based on the movement. The additional vector will be the
+    same angle as the emitter's movement, with a magnitude that is the magnitude of the emitters
+    movement multiplied by speedFromMovement.
+
+    Default value is 0.
+*/
+/*!
+    \qmlproperty Shape QtQuick.Particles2::TrailEmitter::emitShape
+
+    As the area of a TrailEmitter is the area it follows, a separate shape can be provided
+    to be the shape it emits out of. This shape has width and height specified by emitWidth
+    and emitHeight, and is centered on the followed particle's position.
+
+    The default shape is a filled Rectangle.
+*/
+/*!
+    \qmlproperty real QtQuick.Particles2::TrailEmitter::emitWidth
+
+    The width in pixels the emitShape is scaled to. If set to TrailEmitter.ParticleSize,
+    the width will be the current size of the particle being followed.
+
+    Default is 0.
+*/
+/*!
+    \qmlproperty real QtQuick.Particles2::TrailEmitter::emitHeight
+
+    The height in pixels the emitShape is scaled to. If set to TrailEmitter.ParticleSize,
+    the height will be the current size of the particle being followed.
+
+    Default is 0.
+*/
+/*!
+    \qmlproperty real QtQuick.Particles2::TrailEmitter::emitRatePerParticle
+*/
+/*!
+    \qmlsignal QtQuick.Particles2::TrailEmitter::emitFollowParticles(Array particles, real followed)
+
+    This handler is called when particles are emitted from the \a followed particle. \a particles contains an array of particle objects which can be directly manipulated.
+
+    If you use this signal handler, emitParticles will not be emitted.
+
+*/
+
+bool QQuickTrailEmitter::isEmitFollowConnected()
+{
+    static int idx = QObjectPrivate::get(this)->signalIndex("emitFollowParticles(QDeclarativeV8Handle,QDeclarativeV8Handle)");
+    return QObjectPrivate::get(this)->isSignalConnected(idx);
+}
+
+void QQuickTrailEmitter::recalcParticlesPerSecond(){
+    if (!m_system)
+        return;
+    m_followCount = m_system->groupData[m_system->groupIds[m_follow]]->size();
+    if (!m_followCount){
+        setParticlesPerSecond(1);//XXX: Fix this horrendous hack, needed so they aren't turned off from start (causes crashes - test that when gone you don't crash with 0 PPPS)
+    }else{
+        setParticlesPerSecond(m_particlesPerParticlePerSecond * m_followCount);
+        m_lastEmission.resize(m_followCount);
+        m_lastEmission.fill(m_lastTimeStamp);
+    }
+}
+
+void QQuickTrailEmitter::reset()
+{
+    m_followCount = 0;
+}
+
+void QQuickTrailEmitter::emitWindow(int timeStamp)
+{
+    if (m_system == 0)
+        return;
+    if (!m_enabled && !m_pulseLeft && m_burstQueue.isEmpty())
+        return;
+    if (m_followCount != m_system->groupData[m_system->groupIds[m_follow]]->size()){
+        qreal oldPPS = m_particlesPerSecond;
+        recalcParticlesPerSecond();
+        if (m_particlesPerSecond != oldPPS)
+            return;//system may need to update
+    }
+
+    if (m_pulseLeft){
+        m_pulseLeft -= timeStamp - m_lastTimeStamp * 1000.;
+        if (m_pulseLeft < 0){
+            timeStamp += m_pulseLeft;
+            m_pulseLeft = 0;
+        }
+    }
+
+    //TODO: Implement startTime and speedFromMovement
+    qreal time = timeStamp / 1000.;
+    qreal particleRatio = 1. / m_particlesPerParticlePerSecond;
+    qreal pt;
+    qreal maxLife = (m_particleDuration + m_particleDurationVariation)/1000.0;
+
+    //Have to map it into this system, because particlesystem automaps it back
+    QPointF offset = m_system->mapFromItem(this, QPointF(0, 0));
+    qreal sizeAtEnd = m_particleEndSize >= 0 ? m_particleEndSize : m_particleSize;
+
+    int gId = m_system->groupIds[m_follow];
+    int gId2 = m_system->groupIds[m_group];
+    for (int i=0; i<m_system->groupData[gId]->data.count(); i++) {
+        QQuickParticleData *d = m_system->groupData[gId]->data[i];
+        if (!d->stillAlive()){
+            m_lastEmission[i] = time; //Should only start emitting when it returns to life
+            continue;
+        }
+        pt = m_lastEmission[i];
+        if (pt < d->t)
+            pt = d->t;
+        if (pt + maxLife < time)//We missed so much, that we should skip emiting particles that are dead by now
+            pt = time - maxLife;
+
+        if ((width() || height()) && !effectiveExtruder()->contains(QRectF(offset.x(), offset.y(), width(), height()),QPointF(d->curX(), d->curY()))){
+            m_lastEmission[d->index] = time;//jump over this time period without emitting, because it's outside
+            continue;
+        }
+
+        QList<QQuickParticleData*> toEmit;
+
+        while (pt < time || !m_burstQueue.isEmpty()){
+            QQuickParticleData* datum = m_system->newDatum(gId2, !m_overwrite);
+            if (datum){//else, skip this emission
+                datum->e = this;//###useful?
+
+                // Particle timestamp
+                datum->t = pt;
+                datum->lifeSpan =
+                        (m_particleDuration
+                         + ((rand() % ((m_particleDurationVariation*2) + 1)) - m_particleDurationVariation))
+                        / 1000.0;
+
+                // Particle position
+                // Note that burst location doesn't get used for follow emitter
+                qreal followT =  pt - d->t;
+                qreal followT2 = followT * followT * 0.5;
+                qreal eW = m_emitterXVariation < 0 ? d->curSize() : m_emitterXVariation;
+                qreal eH = m_emitterYVariation < 0 ? d->curSize() : m_emitterYVariation;
+                //Subtract offset, because PS expects this in emitter coordinates
+                QRectF boundsRect(d->x - offset.x() + d->vx * followT + d->ax * followT2 - eW/2,
+                                  d->y - offset.y() + d->vy * followT + d->ay * followT2 - eH/2,
+                                  eW, eH);
+
+                QQuickParticleExtruder* effectiveEmissionExtruder = m_emissionExtruder ? m_emissionExtruder : m_defaultEmissionExtruder;
+                const QPointF &newPos = effectiveEmissionExtruder->extrude(boundsRect);
+                datum->x = newPos.x();
+                datum->y = newPos.y();
+
+                // Particle speed
+                const QPointF &speed = m_speed->sample(newPos);
+                datum->vx = speed.x()
+                    + m_speed_from_movement * d->vx;
+                datum->vy = speed.y()
+                    + m_speed_from_movement * d->vy;
+
+                // Particle acceleration
+                const QPointF &accel = m_acceleration->sample(newPos);
+                datum->ax = accel.x();
+                datum->ay = accel.y();
+
+                // Particle size
+                float sizeVariation = -m_particleSizeVariation
+                        + rand() / float(RAND_MAX) * m_particleSizeVariation * 2;
+
+                float size = qMax((qreal)0.0, m_particleSize + sizeVariation);
+                float endSize = qMax((qreal)0.0, sizeAtEnd + sizeVariation);
+
+                datum->size = size * float(m_enabled);
+                datum->endSize = endSize * float(m_enabled);
+
+                toEmit << datum;
+
+                m_system->emitParticle(datum);
+            }
+            if (!m_burstQueue.isEmpty()){
+                m_burstQueue.first().first--;
+                if (m_burstQueue.first().first <= 0)
+                    m_burstQueue.pop_front();
+            }else{
+                pt += particleRatio;
+            }
+        }
+
+        if (isEmitConnected() || isEmitFollowConnected()) {
+            v8::HandleScope handle_scope;
+            v8::Context::Scope scope(QDeclarativeEnginePrivate::getV8Engine(qmlEngine(this))->context());
+            v8::Handle<v8::Array> array = v8::Array::New(toEmit.size());
+            for (int i=0; i<toEmit.size(); i++)
+                array->Set(i, toEmit[i]->v8Value().toHandle());
+
+            if (isEmitFollowConnected())
+                emitFollowParticles(QDeclarativeV8Handle::fromHandle(array), d->v8Value());//A chance for many arbitrary JS changes
+            else if (isEmitConnected())
+                emitParticles(QDeclarativeV8Handle::fromHandle(array));//A chance for arbitrary JS changes
+        }
+        foreach (QQuickParticleData* d, toEmit)
+            m_system->emitParticle(d);
+        m_lastEmission[d->index] = pt;
+    }
+
+    m_lastTimeStamp = time;
+}
+QT_END_NAMESPACE