diff -r b72c6db6890b -r 5dc02b23752f src/declarative/graphicsitems/qdeclarativeloader.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/declarative/graphicsitems/qdeclarativeloader.cpp	Tue Jul 06 15:10:48 2010 +0300
@@ -0,0 +1,478 @@
+/****************************************************************************
+**
+** Copyright (C) 2010 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 "private/qdeclarativeloader_p_p.h"
+
+#include <qdeclarativeinfo.h>
+#include <qdeclarativeengine_p.h>
+#include <qdeclarativeglobal_p.h>
+
+QT_BEGIN_NAMESPACE
+
+QDeclarativeLoaderPrivate::QDeclarativeLoaderPrivate()
+    : item(0), component(0), ownComponent(false)
+{
+}
+
+QDeclarativeLoaderPrivate::~QDeclarativeLoaderPrivate()
+{
+}
+
+void QDeclarativeLoaderPrivate::itemGeometryChanged(QDeclarativeItem *resizeItem, const QRectF &newGeometry, const QRectF &oldGeometry)
+{
+    if (resizeItem == item)
+        _q_updateSize(false);
+    QDeclarativeItemChangeListener::itemGeometryChanged(resizeItem, newGeometry, oldGeometry);
+}
+
+void QDeclarativeLoaderPrivate::clear()
+{
+    if (ownComponent) {
+        component->deleteLater();
+        component = 0;
+        ownComponent = false;
+    }
+    source = QUrl();
+
+    if (item) {
+        if (QDeclarativeItem *qmlItem = qobject_cast<QDeclarativeItem*>(item)) {
+            QDeclarativeItemPrivate *p =
+                    static_cast<QDeclarativeItemPrivate *>(QGraphicsItemPrivate::get(qmlItem));
+            p->removeItemChangeListener(this, QDeclarativeItemPrivate::Geometry);
+        }
+
+        // We can't delete immediately because our item may have triggered
+        // the Loader to load a different item.
+        if (item->scene()) {
+            item->scene()->removeItem(item);
+        } else {
+            item->setParentItem(0);
+            item->setVisible(false);
+        }
+        item->deleteLater();
+        item = 0;
+    }
+}
+
+void QDeclarativeLoaderPrivate::initResize()
+{
+    Q_Q(QDeclarativeLoader);
+    if (QDeclarativeItem *qmlItem = qobject_cast<QDeclarativeItem*>(item)) {
+        QDeclarativeItemPrivate *p =
+                static_cast<QDeclarativeItemPrivate *>(QGraphicsItemPrivate::get(qmlItem));
+        p->addItemChangeListener(this, QDeclarativeItemPrivate::Geometry);
+    } else if (item && item->isWidget()) {
+        QGraphicsWidget *widget = static_cast<QGraphicsWidget*>(item);
+        widget->installEventFilter(q);
+    }
+    _q_updateSize();
+}
+
+/*!
+    \qmlclass Loader QDeclarativeLoader
+    \since 4.7
+    \inherits Item
+
+    \brief The Loader item allows dynamically loading an Item-based
+    subtree from a QML URL or Component.
+
+    Loader instantiates an item from a component. The component to
+    instantiate may be specified directly by the \c sourceComponent
+    property, or loaded from a URL via the \c source property.
+
+    It is also an effective means of delaying the creation of a component
+    until it is required:
+    \code
+    Loader { id: pageLoader }
+    Rectangle {
+        MouseArea { anchors.fill: parent; onClicked: pageLoader.source = "Page1.qml" }
+    }
+    \endcode
+
+    If the Loader source is changed, any previous items instantiated
+    will be destroyed.  Setting \c source to an empty string, or setting
+    sourceComponent to \e undefined
+    will destroy the currently instantiated items, freeing resources
+    and leaving the Loader empty.  For example:
+
+    \code
+    pageLoader.source = ""
+      or
+    pageLoader.sourceComponent = undefined
+    \endcode
+
+    unloads "Page1.qml" and frees resources consumed by it.
+
+    \sa {dynamic-object-creation}{Dynamic Object Creation}
+*/
+
+/*!
+    \internal
+    \class QDeclarativeLoader
+    \qmlclass Loader
+ */
+
+/*!
+    Create a new QDeclarativeLoader instance.
+ */
+QDeclarativeLoader::QDeclarativeLoader(QDeclarativeItem *parent)
+  : QDeclarativeItem(*(new QDeclarativeLoaderPrivate), parent)
+{
+    Q_D(QDeclarativeItem);
+    d->flags |= QGraphicsItem::ItemIsFocusScope;
+}
+
+/*!
+    Destroy the loader instance.
+ */
+QDeclarativeLoader::~QDeclarativeLoader()
+{
+}
+
+/*!
+    \qmlproperty url Loader::source
+    This property holds the URL of the QML component to
+    instantiate.
+
+    \sa sourceComponent, status, progress
+*/
+QUrl QDeclarativeLoader::source() const
+{
+    Q_D(const QDeclarativeLoader);
+    return d->source;
+}
+
+void QDeclarativeLoader::setSource(const QUrl &url)
+{
+    Q_D(QDeclarativeLoader);
+    if (d->source == url)
+        return;
+
+    d->clear();
+
+    d->source = url;
+    if (d->source.isEmpty()) {
+        emit sourceChanged();
+        emit statusChanged();
+        emit progressChanged();
+        emit itemChanged();
+        return;
+    }
+
+    d->component = new QDeclarativeComponent(qmlEngine(this), d->source, this);
+    d->ownComponent = true;
+    if (!d->component->isLoading()) {
+        d->_q_sourceLoaded();
+    } else {
+        connect(d->component, SIGNAL(statusChanged(QDeclarativeComponent::Status)),
+                this, SLOT(_q_sourceLoaded()));
+        connect(d->component, SIGNAL(progressChanged(qreal)),
+                this, SIGNAL(progressChanged()));
+        emit statusChanged();
+        emit progressChanged();
+        emit sourceChanged();
+        emit itemChanged();
+    }
+}
+
+/*!
+    \qmlproperty Component Loader::sourceComponent
+    The sourceComponent 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
+
+    \sa source, progress
+*/
+
+QDeclarativeComponent *QDeclarativeLoader::sourceComponent() const
+{
+    Q_D(const QDeclarativeLoader);
+    return d->component;
+}
+
+void QDeclarativeLoader::setSourceComponent(QDeclarativeComponent *comp)
+{
+    Q_D(QDeclarativeLoader);
+    if (comp == d->component)
+        return;
+
+    d->clear();
+
+    d->component = comp;
+    d->ownComponent = false;
+    if (!d->component) {
+        emit sourceChanged();
+        emit statusChanged();
+        emit progressChanged();
+        emit itemChanged();
+        return;
+    }
+
+    if (!d->component->isLoading()) {
+        d->_q_sourceLoaded();
+    } else {
+        connect(d->component, SIGNAL(statusChanged(QDeclarativeComponent::Status)),
+                this, SLOT(_q_sourceLoaded()));
+        connect(d->component, SIGNAL(progressChanged(qreal)),
+                this, SIGNAL(progressChanged()));
+        emit progressChanged();
+        emit sourceChanged();
+        emit statusChanged();
+        emit itemChanged();
+    }
+}
+
+void QDeclarativeLoader::resetSourceComponent()
+{
+    setSourceComponent(0);
+}
+
+void QDeclarativeLoaderPrivate::_q_sourceLoaded()
+{
+    Q_Q(QDeclarativeLoader);
+
+    if (component) {
+        if (!component->errors().isEmpty()) {
+            QDeclarativeEnginePrivate::warning(qmlEngine(q), component->errors());
+            emit q->sourceChanged();
+            emit q->statusChanged();
+            emit q->progressChanged();
+            return;
+        }
+
+        QDeclarativeContext *ctxt = new QDeclarativeContext(qmlContext(q));
+        ctxt->setContextObject(q);
+
+        QDeclarativeComponent *c = component;
+        QObject *obj = component->create(ctxt);
+        if (component != c) {
+            // component->create could trigger a change in source that causes
+            // component to be set to something else. In that case we just
+            // need to cleanup.
+            delete obj;
+            delete ctxt;
+            return;
+        }
+        if (obj) {
+            item = qobject_cast<QGraphicsObject *>(obj);
+            if (item) {
+                QDeclarative_setParent_noEvent(ctxt, obj);
+                QDeclarative_setParent_noEvent(item, q);
+                item->setParentItem(q);
+//                item->setFocus(true);
+                initResize();
+            } else {
+                qmlInfo(q) << QDeclarativeLoader::tr("Loader does not support loading non-visual elements.");
+                delete obj;
+                delete ctxt;
+            }
+        } else {
+            if (!component->errors().isEmpty())
+                QDeclarativeEnginePrivate::warning(qmlEngine(q), component->errors());
+            delete obj;
+            delete ctxt;
+            source = QUrl();
+        }
+        emit q->sourceChanged();
+        emit q->statusChanged();
+        emit q->progressChanged();
+        emit q->itemChanged();
+        emit q->loaded();
+    }
+}
+
+/*!
+    \qmlproperty enumeration Loader::status
+
+    This property holds the status of QML loading.  It can be one of:
+    \list
+    \o Loader.Null - 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
+
+    Note that a change in the status property does not cause anything to happen
+    (although it reflects what has happened to the loader internally). If you wish
+    to react to the change in status you need to do it yourself, for example in one
+    of the following ways:
+    \list
+    \o Create a state, so that a state change occurs, e.g. State{name: 'loaded'; when: loader.status = Loader.Ready;}
+    \o Do something inside the onLoaded signal handler, e.g. Loader{id: loader; onLoaded: console.log('Loaded');}
+    \o Bind to the status variable somewhere, e.g. Text{text: if(loader.status!=Loader.Ready){'Not Loaded';}else{'Loaded';}}
+    \endlist
+    \sa progress
+
+    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.
+*/
+
+QDeclarativeLoader::Status QDeclarativeLoader::status() const
+{
+    Q_D(const QDeclarativeLoader);
+
+    if (d->component)
+        return static_cast<QDeclarativeLoader::Status>(d->component->status());
+
+    if (d->item)
+        return Ready;
+
+    return d->source.isEmpty() ? Null : Error;
+}
+
+void QDeclarativeLoader::componentComplete()
+{
+    QDeclarativeItem::componentComplete();
+    if (status() == Ready)
+        emit loaded();
+}
+
+
+/*!
+    \qmlsignal Loader::onLoaded()
+
+    This handler is called when the \l status becomes Loader.Ready, or on successful
+    initial load.
+*/
+
+
+/*!
+\qmlproperty real 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 QDeclarativeLoader::progress() const
+{
+    Q_D(const QDeclarativeLoader);
+
+    if (d->item)
+        return 1.0;
+
+    if (d->component)
+        return d->component->progress();
+
+    return 0.0;
+}
+
+void QDeclarativeLoaderPrivate::_q_updateSize(bool loaderGeometryChanged)
+{
+    Q_Q(QDeclarativeLoader);
+    if (!item)
+        return;
+    if (QDeclarativeItem *qmlItem = qobject_cast<QDeclarativeItem*>(item)) {
+        q->setImplicitWidth(qmlItem->width());
+        if (loaderGeometryChanged && q->widthValid())
+            qmlItem->setWidth(q->width());
+        q->setImplicitHeight(qmlItem->height());
+        if (loaderGeometryChanged && q->heightValid())
+            qmlItem->setHeight(q->height());
+    } else if (item && item->isWidget()) {
+        QGraphicsWidget *widget = static_cast<QGraphicsWidget*>(item);
+        QSizeF widgetSize = widget->size();
+        q->setImplicitWidth(widgetSize.width());
+        if (loaderGeometryChanged && q->widthValid())
+            widgetSize.setWidth(q->width());
+        q->setImplicitHeight(widgetSize.height());
+        if (loaderGeometryChanged && q->heightValid())
+            widgetSize.setHeight(q->height());
+        if (widget->size() != widgetSize)
+            widget->resize(widgetSize);
+    }
+}
+
+/*!
+    \qmlproperty Item Loader::item
+    This property holds the top-level item created from source.
+*/
+QGraphicsObject *QDeclarativeLoader::item() const
+{
+    Q_D(const QDeclarativeLoader);
+    return d->item;
+}
+
+void QDeclarativeLoader::geometryChanged(const QRectF &newGeometry, const QRectF &oldGeometry)
+{
+    Q_D(QDeclarativeLoader);
+    if (newGeometry != oldGeometry) {
+        d->_q_updateSize();
+    }
+    QDeclarativeItem::geometryChanged(newGeometry, oldGeometry);
+}
+
+QVariant QDeclarativeLoader::itemChange(GraphicsItemChange change, const QVariant &value)
+{
+    Q_D(QDeclarativeLoader);
+    if (change == ItemSceneHasChanged) {
+        if (d->item && d->item->isWidget()) {
+            d->item->removeEventFilter(this);
+            d->item->installEventFilter(this);
+        }
+    }
+    return QDeclarativeItem::itemChange(change, value);
+}
+
+bool QDeclarativeLoader::eventFilter(QObject *watched, QEvent *e)
+{
+    Q_D(QDeclarativeLoader);
+    if (watched == d->item && e->type() == QEvent::GraphicsSceneResize) {
+        if (d->item && d->item->isWidget())
+            d->_q_updateSize(false);
+    }
+    return QDeclarativeItem::eventFilter(watched, e);
+}
+
+#include <moc_qdeclarativeloader_p.cpp>
+
+QT_END_NAMESPACE