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, 858 insertions, 0 deletions

diff --git a/src/quick/items/qquickloader.cpp b/src/quick/items/qquickloader.cpp
new file mode 100644
index 0000000000..f9fd9148ee
--- /dev/null
+++ b/src/quick/items/qquickloader.cpp
@@ -0,0 +1,858 @@
+/****************************************************************************
+**
+** 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 QtDeclarative 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 "qquickloader_p_p.h"
+
+#include <QtDeclarative/qdeclarativeinfo.h>
+
+#include <private/qdeclarativeengine_p.h>
+#include <private/qdeclarativeglobal_p.h>
+
+#include <private/qdeclarativecomponent_p.h>
+
+#include <private/qv8_p.h>
+
+QT_BEGIN_NAMESPACE
+
+QQuickLoaderPrivate::QQuickLoaderPrivate()
+    : item(0), component(0), itemContext(0), incubator(0), updatingSize(false),
+      itemWidthValid(false), itemHeightValid(false),
+      active(true), loadingFromSource(false), asynchronous(false)
+{
+}
+
+QQuickLoaderPrivate::~QQuickLoaderPrivate()
+{
+    delete incubator;
+    disposeInitialPropertyValues();
+}
+
+void QQuickLoaderPrivate::itemGeometryChanged(QQuickItem *resizeItem, const QRectF &newGeometry, const QRectF &oldGeometry)
+{
+    if (resizeItem == item) {
+        if (!updatingSize && newGeometry.width() != oldGeometry.width())
+            itemWidthValid = true;
+        if (!updatingSize && newGeometry.height() != oldGeometry.height())
+            itemHeightValid = true;
+        _q_updateSize(false);
+    }
+    QQuickItemChangeListener::itemGeometryChanged(resizeItem, newGeometry, oldGeometry);
+}
+
+void QQuickLoaderPrivate::clear()
+{
+    disposeInitialPropertyValues();
+
+    if (incubator)
+        incubator->clear();
+
+    if (loadingFromSource && component) {
+        component->deleteLater();
+        component = 0;
+    }
+    source = QUrl();
+
+    if (item) {
+        QQuickItemPrivate *p = QQuickItemPrivate::get(item);
+        p->removeItemChangeListener(this, QQuickItemPrivate::Geometry);
+
+        // We can't delete immediately because our item may have triggered
+        // the Loader to load a different item.
+        item->setParentItem(0);
+        item->setVisible(false);
+        item->deleteLater();
+        item = 0;
+    }
+}
+
+void QQuickLoaderPrivate::initResize()
+{
+    QQuickItemPrivate *p = QQuickItemPrivate::get(item);
+    p->addItemChangeListener(this, QQuickItemPrivate::Geometry);
+    // We may override the item's size, so we need to remember
+    // whether the item provided its own valid size.
+    itemWidthValid = p->widthValid;
+    itemHeightValid = p->heightValid;
+    _q_updateSize();
+}
+
+/*!
+    \qmlclass Loader QQuickLoader
+    \inqmlmodule QtQuick 2
+    \ingroup qml-utility-elements
+    \inherits Item
+
+    \brief The Loader item allows dynamically loading an Item-based
+    subtree from a URL or Component.
+
+    Loader is used to dynamically load visual QML components. It can load a
+    QML file (using the \l source property) or a \l Component object (using
+    the \l sourceComponent property). It is useful for delaying the creation
+    of a component until it is required: for example, when a component should
+    be created on demand, or when a component should not be created
+    unnecessarily for performance reasons.
+
+    Here is a Loader that loads "Page1.qml" as a component when the
+    \l MouseArea is clicked:
+
+    \snippet doc/src/snippets/declarative/loader/simple.qml 0
+
+    The loaded item can be accessed using the \l item property.
+
+    If the \l source or \l sourceComponent changes, any previously instantiated
+    items are destroyed. Setting \l source to an empty string or setting
+    \l sourceComponent to \c undefined destroys the currently loaded item,
+    freeing resources and leaving the Loader empty.
+
+    \section2 Loader sizing behavior
+
+    Loader is like any other visual item and must be positioned and sized
+    accordingly to become visible.
+
+    \list
+    \o If an explicit size is not specified for the Loader, the Loader
+    is automatically resized to the size of the loaded item once the
+    component is loaded.
+    \o If the size of the Loader is specified explicitly by setting
+    the width, height or by anchoring, the loaded item will be resized
+    to the size of the Loader.
+    \endlist
+
+    In both scenarios the size of the item and the Loader are identical.
+    This ensures that anchoring to the Loader is equivalent to anchoring
+    to the loaded item.
+
+    \table
+    \row
+    \o sizeloader.qml
+    \o sizeitem.qml
+    \row
+    \o \snippet doc/src/snippets/declarative/loader/sizeloader.qml 0
+    \o \snippet doc/src/snippets/declarative/loader/sizeitem.qml 0
+    \row
+    \o The red rectangle will be sized to the size of the root item.
+    \o The red rectangle will be 50x50, centered in the root item.
+    \endtable
+
+
+    \section2 Receiving signals from loaded items
+
+    Any signals emitted from the loaded item can be received using the
+    \l Connections element. For example, the following \c application.qml
+    loads \c MyItem.qml, and is able to receive the \c message signal from
+    the loaded item through a \l Connections object:
+
+    \table
+    \row
+    \o application.qml
+    \o MyItem.qml
+    \row
+    \o \snippet doc/src/snippets/declarative/loader/connections.qml 0
+    \o \snippet doc/src/snippets/declarative/loader/MyItem.qml 0
+    \endtable
+
+    Alternatively, since \c MyItem.qml is loaded within the scope of the
+    Loader, it could also directly call any function defined in the Loader or
+    its parent \l Item.
+
+
+    \section2 Focus and key events
+
+    Loader is a focus scope. Its \l {Item::}{focus} property must be set to
+    \c true for any of its children to get the \e {active focus}. (See
+    \l{qmlfocus#Acquiring Focus and Focus Scopes}{the focus documentation page}
+    for more details.) Any key events received in the loaded item should likely
+    also be \l {KeyEvent::}{accepted} so they are not propagated to the Loader.
+
+    For example, the following \c application.qml loads \c KeyReader.qml when
+    the \l MouseArea is clicked.  Notice the \l {Item::}{focus} property is
+    set to \c true for the Loader as well as the \l Item in the dynamically
+    loaded object:
+
+    \table
+    \row
+    \o application.qml
+    \o KeyReader.qml
+    \row
+    \o \snippet doc/src/snippets/declarative/loader/focus.qml 0
+    \o \snippet doc/src/snippets/declarative/loader/KeyReader.qml 0
+    \endtable
+
+    Once \c KeyReader.qml is loaded, it accepts key events and sets
+    \c event.accepted to \c true so that the event is not propagated to the
+    parent \l Rectangle.
+
+    \sa {dynamic-object-creation}{Dynamic Object Creation}
+*/
+
+QQuickLoader::QQuickLoader(QQuickItem *parent)
+  : QQuickImplicitSizeItem(*(new QQuickLoaderPrivate), parent)
+{
+    setFlag(ItemIsFocusScope);
+}
+
+QQuickLoader::~QQuickLoader()
+{
+    Q_D(QQuickLoader);
+    if (d->item) {
+        QQuickItemPrivate *p = QQuickItemPrivate::get(d->item);
+        p->removeItemChangeListener(d, QQuickItemPrivate::Geometry);
+    }
+}
+
+/*!
+    \qmlproperty bool QtQuick2::Loader::active
+    This property is \c true if the Loader is currently active.
+    The default value for the \l active property is \c true.
+
+    If the Loader is inactive, changing the \l source or \l sourceComponent
+    will not cause the item to be instantiated until the Loader is made active.
+
+    Setting the value to inactive will cause any \l item loaded by the loader
+    to be released, but will not affect the \l source or \l sourceComponent.
+
+    The \l status of an inactive loader is always \c Null.
+
+    \sa source, sourceComponent
+ */
+bool QQuickLoader::active() const
+{
+    Q_D(const QQuickLoader);
+    return d->active;
+}
+
+void QQuickLoader::setActive(bool newVal)
+{
+    Q_D(QQuickLoader);
+    if (d->active != newVal) {
+        d->active = newVal;
+        if (newVal == true) {
+            if (d->loadingFromSource) {
+                loadFromSource();
+            } else {
+                loadFromSourceComponent();
+            }
+        } else {
+            if (d->item) {
+                QQuickItemPrivate *p = QQuickItemPrivate::get(d->item);
+                p->removeItemChangeListener(d, QQuickItemPrivate::Geometry);
+
+                // We can't delete immediately because our item may have triggered
+                // the Loader to load a different item.
+                d->item->setParentItem(0);
+                d->item->setVisible(false);
+                d->item->deleteLater();
+                d->item = 0;
+                emit itemChanged();
+            }
+            emit statusChanged();
+        }
+        emit activeChanged();
+    }
+}
+
+
+/*!
+    \qmlproperty url QtQuick2::Loader::source
+    This property holds the URL of the QML component to instantiate.
+
+    Note the QML component must be an \l{Item}-based component. The loader
+    cannot load non-visual components.
+
+    To unload the currently loaded item, set this property to an empty string,
+    or set \l sourceComponent to \c undefined. Setting \c source to a
+    new URL will also cause the item created by the previous URL to be unloaded.
+
+    \sa sourceComponent, status, progress
+*/
+QUrl QQuickLoader::source() const
+{
+    Q_D(const QQuickLoader);
+    return d->source;
+}
+
+void QQuickLoader::setSource(const QUrl &url)
+{
+    setSource(url, true); // clear previous values
+}
+
+void QQuickLoader::setSource(const QUrl &url, bool needsClear)
+{
+    Q_D(QQuickLoader);
+    if (d->source == url)
+        return;
+
+    if (needsClear)
+        d->clear();
+
+    d->source = url;
+    d->loadingFromSource = true;
+
+    if (d->active)
+        loadFromSource();
+    else
+        emit sourceChanged();
+}
+
+void QQuickLoader::loadFromSource()
+{
+    Q_D(QQuickLoader);
+    if (d->source.isEmpty()) {
+        emit sourceChanged();
+        emit statusChanged();
+        emit progressChanged();
+        emit itemChanged();
+        return;
+    }
+
+    if (isComponentComplete()) {
+        d->component = new QDeclarativeComponent(qmlEngine(this), d->source, this);
+        d->load();
+    }
+}
+
+/*!
+    \qmlproperty Component QtQuick2::Loader::sourceComponent
+    This property holds the \l{Component} to instantiate.
+
+    \qml
+    Item {
+        Component {
+            id: redSquare
+            Rectangle { color: "red"; width: 10; height: 10 }
+        }
+
+        Loader { sourceComponent: redSquare }
+        Loader { sourceComponent: redSquare; x: 10 }
+    }
+    \endqml
+
+    To unload the currently loaded item, set this property to an empty string
+    or \c undefined.
+
+    \sa source, progress
+*/
+
+QDeclarativeComponent *QQuickLoader::sourceComponent() const
+{
+    Q_D(const QQuickLoader);
+    return d->component;
+}
+
+void QQuickLoader::setSourceComponent(QDeclarativeComponent *comp)
+{
+    Q_D(QQuickLoader);
+    if (comp == d->component)
+        return;
+
+    d->clear();
+
+    d->component = comp;
+    d->loadingFromSource = false;
+
+    if (d->active)
+        loadFromSourceComponent();
+    else
+        emit sourceComponentChanged();
+}
+
+void QQuickLoader::resetSourceComponent()
+{
+    setSourceComponent(0);
+}
+
+void QQuickLoader::loadFromSourceComponent()
+{
+    Q_D(QQuickLoader);
+    if (!d->component) {
+        emit sourceComponentChanged();
+        emit statusChanged();
+        emit progressChanged();
+        emit itemChanged();
+        return;
+    }
+
+    if (isComponentComplete())
+        d->load();
+}
+
+/*!
+    \qmlmethod object QtQuick2::Loader::setSource(url source, object properties)
+
+    Creates an object instance of the given \a source component that will have
+    the given \a properties. The \a properties argument is optional.  The instance
+    will be accessible via the \l item property once loading and instantiation
+    is complete.
+
+    If the \l active property is \c false at the time when this function is called,
+    the given \a source component will not be loaded but the \a source and initial
+    \a properties will be cached.  When the loader is made \l active, an instance of
+    the \a source component will be created with the initial \a properties set.
+
+    Setting the initial property values of an instance of a component in this manner
+    will \bold{not} trigger any associated \l{Behavior}s.
+
+    Note that the cached \a properties will be cleared if the \l source or \l sourceComponent
+    is changed after calling this function but prior to setting the loader \l active.
+
+    Example:
+    \table
+    \row
+    \o
+    \qml
+    // ExampleComponent.qml
+    import QtQuick 2.0
+    Rectangle {
+        id: rect
+        color: "red"
+        width: 10
+        height: 10
+
+        Behavior on color {
+            NumberAnimation {
+                target: rect
+                property: "width"
+                to: (rect.width + 20)
+                duration: 0
+            }
+        }
+    }
+    \endqml
+    \o
+    \qml
+    // example.qml
+    import QtQuick 2.0
+    Item {
+        Loader {
+            id: squareLoader
+            onLoaded: console.log(squareLoader.item.width); // prints [10], not [30]
+        }
+
+        Component.onCompleted: {
+            squareLoader.setSource("ExampleComponent.qml", { "color": "blue" });
+            // will trigger the onLoaded code when complete.
+        }
+    }
+    \endqml
+    \endtable
+
+    \sa source, active
+*/
+void QQuickLoader::setSource(QDeclarativeV8Function *args)
+{
+    Q_ASSERT(args);
+    Q_D(QQuickLoader);
+
+    bool ipvError = false;
+    args->returnValue(v8::Undefined());
+    v8::Handle<v8::Object> ipv = d->extractInitialPropertyValues(args, this, &ipvError);
+    if (ipvError)
+        return;
+
+    d->clear();
+    QUrl sourceUrl = d->resolveSourceUrl(args);
+    if (!ipv.IsEmpty()) {
+        d->disposeInitialPropertyValues();
+        d->initialPropertyValues = qPersistentNew(ipv);
+        d->qmlGlobalForIpv = qPersistentNew(args->qmlGlobal());
+    }
+
+    setSource(sourceUrl, false); // already cleared and set ipv above.
+}
+
+void QQuickLoaderPrivate::disposeInitialPropertyValues()
+{
+    if (!initialPropertyValues.IsEmpty())
+        qPersistentDispose(initialPropertyValues);
+    if (!qmlGlobalForIpv.IsEmpty())
+        qPersistentDispose(qmlGlobalForIpv);
+}
+
+void QQuickLoaderPrivate::load()
+{
+    Q_Q(QQuickLoader);
+
+    if (!q->isComponentComplete() || !component)
+        return;
+
+    if (!component->isLoading()) {
+        _q_sourceLoaded();
+    } else {
+        QObject::connect(component, SIGNAL(statusChanged(QDeclarativeComponent::Status)),
+                q, SLOT(_q_sourceLoaded()));
+        QObject::connect(component, SIGNAL(progressChanged(qreal)),
+                q, SIGNAL(progressChanged()));
+        emit q->statusChanged();
+        emit q->progressChanged();
+        if (loadingFromSource)
+            emit q->sourceChanged();
+        else
+            emit q->sourceComponentChanged();
+        emit q->itemChanged();
+    }
+}
+
+void QQuickLoaderIncubator::setInitialState(QObject *o)
+{
+    loader->setInitialState(o);
+}
+
+void QQuickLoaderPrivate::setInitialState(QObject *obj)
+{
+    Q_Q(QQuickLoader);
+
+    QQuickItem *item = qobject_cast<QQuickItem*>(obj);
+    if (item) {
+        QDeclarative_setParent_noEvent(itemContext, obj);
+        QDeclarative_setParent_noEvent(item, q);
+        item->setParentItem(q);
+    }
+
+    if (initialPropertyValues.IsEmpty())
+        return;
+
+    QDeclarativeComponentPrivate *d = QDeclarativeComponentPrivate::get(component);
+    Q_ASSERT(d && d->engine);
+    d->initializeObjectWithInitialProperties(qmlGlobalForIpv, initialPropertyValues, obj);
+}
+
+void QQuickLoaderIncubator::statusChanged(Status status)
+{
+    loader->incubatorStateChanged(status);
+}
+
+void QQuickLoaderPrivate::incubatorStateChanged(QDeclarativeIncubator::Status status)
+{
+    Q_Q(QQuickLoader);
+    if (status == QDeclarativeIncubator::Loading || status == QDeclarativeIncubator::Null)
+        return;
+
+    if (status == QDeclarativeIncubator::Ready) {
+        QObject *obj = incubator->object();
+        item = qobject_cast<QQuickItem*>(obj);
+        if (item) {
+            initResize();
+        } else {
+            qmlInfo(q) << QQuickLoader::tr("Loader does not support loading non-visual elements.");
+            delete itemContext;
+            itemContext = 0;
+            delete obj;
+        }
+        incubator->clear();
+    } else if (status == QDeclarativeIncubator::Error) {
+        if (!incubator->errors().isEmpty())
+            QDeclarativeEnginePrivate::warning(qmlEngine(q), incubator->errors());
+        delete itemContext;
+        itemContext = 0;
+        delete incubator->object();
+        source = QUrl();
+    }
+    if (loadingFromSource)
+        emit q->sourceChanged();
+    else
+        emit q->sourceComponentChanged();
+    emit q->statusChanged();
+    emit q->progressChanged();
+    emit q->itemChanged();
+    emit q->loaded();
+    disposeInitialPropertyValues(); // cleanup
+}
+
+void QQuickLoaderPrivate::_q_sourceLoaded()
+{
+    Q_Q(QQuickLoader);
+    if (!component || !component->errors().isEmpty()) {
+        if (component)
+            QDeclarativeEnginePrivate::warning(qmlEngine(q), component->errors());
+        if (loadingFromSource)
+            emit q->sourceChanged();
+        else
+            emit q->sourceComponentChanged();
+        emit q->statusChanged();
+        emit q->progressChanged();
+        disposeInitialPropertyValues(); // cleanup
+        return;
+    }
+
+    QDeclarativeContext *creationContext = component->creationContext();
+    if (!creationContext) creationContext = qmlContext(q);
+    itemContext = new QDeclarativeContext(creationContext);
+    itemContext->setContextObject(q);
+
+    delete incubator;
+    incubator = new QQuickLoaderIncubator(this, asynchronous ? QDeclarativeIncubator::Asynchronous : QDeclarativeIncubator::AsynchronousIfNested);
+
+    component->create(*incubator, itemContext);
+
+    if (incubator && incubator->status() == QDeclarativeIncubator::Loading)
+        emit q->statusChanged();
+}
+
+/*!
+    \qmlproperty enumeration QtQuick2::Loader::status
+
+    This property holds the status of QML loading.  It can be one of:
+    \list
+    \o Loader.Null - the loader is inactive or no QML source has been set
+    \o Loader.Ready - the QML source has been loaded
+    \o Loader.Loading - the QML source is currently being loaded
+    \o Loader.Error - an error occurred while loading the QML source
+    \endlist
+
+    Use this status to provide an update or respond to the status change in some way.
+    For example, you could:
+
+    \list
+    \o Trigger a state change:
+    \qml
+        State { name: 'loaded'; when: loader.status == Loader.Ready }
+    \endqml
+
+    \o Implement an \c onStatusChanged signal handler:
+    \qml
+        Loader {
+            id: loader
+            onStatusChanged: if (loader.status == Loader.Ready) console.log('Loaded')
+        }
+    \endqml
+
+    \o Bind to the status value:
+    \qml
+        Text { text: loader.status == Loader.Ready ? 'Loaded' : 'Not loaded' }
+    \endqml
+    \endlist
+
+    Note that if the source is a local file, the status will initially be Ready (or Error). While
+    there will be no onStatusChanged signal in that case, the onLoaded will still be invoked.
+
+    \sa progress
+*/
+
+QQuickLoader::Status QQuickLoader::status() const
+{
+    Q_D(const QQuickLoader);
+
+    if (!d->active)
+        return Null;
+
+    if (d->component) {
+        switch (d->component->status()) {
+        case QDeclarativeComponent::Loading:
+            return Loading;
+        case QDeclarativeComponent::Error:
+            return Error;
+        case QDeclarativeComponent::Null:
+            return Null;
+        default:
+            break;
+        }
+    }
+
+    if (d->incubator) {
+        switch (d->incubator->status()) {
+        case QDeclarativeIncubator::Loading:
+            return Loading;
+        case QDeclarativeIncubator::Error:
+            return Error;
+        default:
+            break;
+        }
+    }
+
+    if (d->item)
+        return Ready;
+
+    return d->source.isEmpty() ? Null : Error;
+}
+
+void QQuickLoader::componentComplete()
+{
+    Q_D(QQuickLoader);
+    QQuickItem::componentComplete();
+    if (active()) {
+        if (d->loadingFromSource) {
+            d->component = new QDeclarativeComponent(qmlEngine(this), d->source, this);
+        }
+        d->load();
+    }
+}
+
+/*!
+    \qmlsignal QtQuick2::Loader::onLoaded()
+
+    This handler is called when the \l status becomes \c Loader.Ready, or on successful
+    initial load.
+*/
+
+
+/*!
+\qmlproperty real QtQuick2::Loader::progress
+
+This property holds the progress of loading QML data from the network, from
+0.0 (nothing loaded) to 1.0 (finished).  Most QML files are quite small, so
+this value will rapidly change from 0 to 1.
+
+\sa status
+*/
+qreal QQuickLoader::progress() const
+{
+    Q_D(const QQuickLoader);
+
+    if (d->item)
+        return 1.0;
+
+    if (d->component)
+        return d->component->progress();
+
+    return 0.0;
+}
+
+/*!
+\qmlproperty bool QtQuick2::Loader::asynchronous
+
+This property holds whether the component will be instantiated asynchronously.
+
+Loading asynchronously creates the objects declared by the component
+across multiple frames, and reduces the
+likelihood of glitches in animation.  When loading asynchronously the status
+will change to Loader.Loading.  Once the entire component has been created, the
+\l item will be available and the status will change to Loader.Ready.
+
+To avoid seeing the items loading progressively set \c visible appropriately, e.g.
+
+\code
+Loader {
+    source: "mycomponent.qml"
+    asynchronous: true
+    visible: status == Loader.Ready
+}
+\endcode
+
+Note that this property affects object instantiation only; it is unrelated to
+loading a component asynchronously via a network.
+*/
+bool QQuickLoader::asynchronous() const
+{
+    Q_D(const QQuickLoader);
+    return d->asynchronous;
+}
+
+void QQuickLoader::setAsynchronous(bool a)
+{
+    Q_D(QQuickLoader);
+    if (d->asynchronous == a)
+        return;
+
+    d->asynchronous = a;
+    emit asynchronousChanged();
+}
+
+void QQuickLoaderPrivate::_q_updateSize(bool loaderGeometryChanged)
+{
+    Q_Q(QQuickLoader);
+    if (!item || updatingSize)
+        return;
+
+    updatingSize = true;
+
+    qreal iWidth = !itemWidthValid ? item->implicitWidth() : item->width();
+    qreal iHeight = !itemHeightValid ? item->implicitHeight() : item->height();
+    q->setImplicitSize(iWidth, iHeight);
+
+    if (loaderGeometryChanged && q->widthValid())
+        item->setWidth(q->width());
+    if (loaderGeometryChanged && q->heightValid())
+        item->setHeight(q->height());
+
+    updatingSize = false;
+}
+
+/*!
+    \qmlproperty Item QtQuick2::Loader::item
+    This property holds the top-level item that is currently loaded.
+*/
+QQuickItem *QQuickLoader::item() const
+{
+    Q_D(const QQuickLoader);
+    return d->item;
+}
+
+void QQuickLoader::geometryChanged(const QRectF &newGeometry, const QRectF &oldGeometry)
+{
+    Q_D(QQuickLoader);
+    if (newGeometry != oldGeometry) {
+        d->_q_updateSize();
+    }
+    QQuickItem::geometryChanged(newGeometry, oldGeometry);
+}
+
+QUrl QQuickLoaderPrivate::resolveSourceUrl(QDeclarativeV8Function *args)
+{
+    QV8Engine *v8engine = args->engine();
+    QString arg = v8engine->toString((*args)[0]->ToString());
+    if (arg.isEmpty())
+        return QUrl();
+
+    QDeclarativeContextData *context = args->context();
+    Q_ASSERT(context);
+    return context->resolvedUrl(QUrl(arg));
+}
+
+v8::Handle<v8::Object> QQuickLoaderPrivate::extractInitialPropertyValues(QDeclarativeV8Function *args, QObject *loader, bool *error)
+{
+    v8::Local<v8::Object> valuemap;
+    if (args->Length() >= 2) {
+        v8::Local<v8::Value> v = (*args)[1];
+        if (!v->IsObject() || v->IsArray()) {
+            *error = true;
+            qmlInfo(loader) << loader->tr("setSource: value is not an object");
+        } else {
+            *error = false;
+            valuemap = v8::Local<v8::Object>::Cast(v);
+        }
+    }
+
+    return valuemap;
+}
+
+#include <moc_qquickloader_p.cpp>
+
+QT_END_NAMESPACE