Merge branch 'master' of scm.dev.nokia.troll.no:qt/qt-qml

10 files changed, 188 insertions, 62 deletions

diff --git a/src/declarative/graphicsitems/qdeclarativeborderimage.cpp b/src/declarative/graphicsitems/qdeclarativeborderimage.cpp
index 1f26338..de16668 100644
--- a/src/declarative/graphicsitems/qdeclarativeborderimage.cpp
+++ b/src/declarative/graphicsitems/qdeclarativeborderimage.cpp
@@ -168,18 +168,26 @@ void QDeclarativeBorderImage::setSource(const QUrl &url)
 
     d->url = url;
     d->sciurl = QUrl();
+    emit sourceChanged(d->url);
+
+    if (isComponentComplete())
+        load();
+}
+
+void QDeclarativeBorderImage::load()
+{
+    Q_D(QDeclarativeBorderImage);
     if (d->progress != 0.0) {
         d->progress = 0.0;
         emit progressChanged(d->progress);
     }
 
-    if (url.isEmpty()) {
+    if (d->url.isEmpty()) {
         d->pix = QPixmap();
         d->status = Null;
         setImplicitWidth(0);
         setImplicitHeight(0);
         emit statusChanged(d->status);
-        emit sourceChanged(d->url);
         update();
     } else {
         d->status = Loading;
@@ -195,11 +203,21 @@ void QDeclarativeBorderImage::setSource(const QUrl &url)
             {
                 QNetworkRequest req(d->url);
                 d->sciReply = qmlEngine(this)->networkAccessManager()->get(req);
-                QObject::connect(d->sciReply, SIGNAL(finished()),
-                                 this, SLOT(sciRequestFinished()));
+
+                static int sciReplyFinished = -1;
+                static int thisSciRequestFinished = -1;
+                if (sciReplyFinished == -1) {
+                    sciReplyFinished =
+                        QNetworkReply::staticMetaObject.indexOfSignal("finished()");
+                    thisSciRequestFinished =
+                        QDeclarativeBorderImage::staticMetaObject.indexOfSlot("sciRequestFinished()");
+                }
+
+                QMetaObject::connect(d->sciReply, sciReplyFinished, this,
+                                     thisSciRequestFinished, Qt::DirectConnection);
             }
         } else {
-            QDeclarativePixmapReply::Status status = QDeclarativePixmapCache::get(d->url, &d->pix);
+            QDeclarativePixmapReply::Status status = QDeclarativePixmapCache::get(d->url, &d->pix, d->async);
             if (status != QDeclarativePixmapReply::Ready && status != QDeclarativePixmapReply::Error) {
                 QDeclarativePixmapReply *reply = QDeclarativePixmapCache::request(qmlEngine(this), d->url);
                 d->pendingPixmapCache = true;
@@ -217,7 +235,6 @@ void QDeclarativeBorderImage::setSource(const QUrl &url)
                     d->status = Ready;
                 d->progress = 1.0;
                 emit statusChanged(d->status);
-                emit sourceChanged(d->url);
                 emit progressChanged(d->progress);
                 update();
             }
@@ -319,13 +336,30 @@ void QDeclarativeBorderImage::setGridScaledImage(const QDeclarativeGridScaledIma
         d->verticalTileMode = sci.verticalTileRule();
 
         d->sciurl = d->url.resolved(QUrl(sci.pixmapUrl()));
-        QDeclarativePixmapReply::Status status = QDeclarativePixmapCache::get(d->sciurl, &d->pix);
+        QDeclarativePixmapReply::Status status = QDeclarativePixmapCache::get(d->sciurl, &d->pix, d->async);
         if (status != QDeclarativePixmapReply::Ready && status != QDeclarativePixmapReply::Error) {
             QDeclarativePixmapReply *reply = QDeclarativePixmapCache::request(qmlEngine(this), d->sciurl);
             d->sciPendingPixmapCache = true;
-            connect(reply, SIGNAL(finished()), this, SLOT(requestFinished()));
-            connect(reply, SIGNAL(downloadProgress(qint64,qint64)),
-                    this, SLOT(requestProgress(qint64,qint64)));
+
+            static int replyDownloadProgress = -1;
+            static int replyFinished = -1;
+            static int thisRequestProgress = -1;
+            static int thisRequestFinished = -1;
+            if (replyDownloadProgress == -1) {
+                replyDownloadProgress =
+                    QDeclarativePixmapReply::staticMetaObject.indexOfSignal("downloadProgress(qint64,qint64)");
+                replyFinished =
+                    QDeclarativePixmapReply::staticMetaObject.indexOfSignal("finished()");
+                thisRequestProgress =
+                    QDeclarativeBorderImage::staticMetaObject.indexOfSlot("requestProgress(qint64,qint64)");
+                thisRequestFinished =
+                    QDeclarativeBorderImage::staticMetaObject.indexOfSlot("requestFinished()");
+            }
+
+            QMetaObject::connect(reply, replyFinished, this,
+                                 thisRequestFinished, Qt::DirectConnection);
+            QMetaObject::connect(reply, replyDownloadProgress, this,
+                                 thisRequestProgress, Qt::DirectConnection);
         } else {
             //### should be unified with requestFinished
             setImplicitWidth(d->pix.width());
@@ -337,7 +371,6 @@ void QDeclarativeBorderImage::setGridScaledImage(const QDeclarativeGridScaledIma
                 d->status = Ready;
             d->progress = 1.0;
             emit statusChanged(d->status);
-            emit sourceChanged(d->url);
             emit progressChanged(1.0);
             update();
         }
@@ -350,10 +383,10 @@ void QDeclarativeBorderImage::requestFinished()
 
     if (d->url.path().endsWith(QLatin1String(".sci"))) {
         d->sciPendingPixmapCache = false;
-        QDeclarativePixmapCache::get(d->sciurl, &d->pix);
+        QDeclarativePixmapCache::get(d->sciurl, &d->pix, d->async);
     } else {
         d->pendingPixmapCache = false;
-        if (QDeclarativePixmapCache::get(d->url, &d->pix) != QDeclarativePixmapReply::Ready)
+        if (QDeclarativePixmapCache::get(d->url, &d->pix, d->async) != QDeclarativePixmapReply::Ready)
             d->status = Error;
     }
     setImplicitWidth(d->pix.width());
@@ -363,7 +396,6 @@ void QDeclarativeBorderImage::requestFinished()
         d->status = Ready;
     d->progress = 1.0;
     emit statusChanged(d->status);
-    emit sourceChanged(d->url);
     emit progressChanged(1.0);
     update();
 }
diff --git a/src/declarative/graphicsitems/qdeclarativeborderimage_p.h b/src/declarative/graphicsitems/qdeclarativeborderimage_p.h
index db81fd8..a759e67 100644
--- a/src/declarative/graphicsitems/qdeclarativeborderimage_p.h
+++ b/src/declarative/graphicsitems/qdeclarativeborderimage_p.h
@@ -84,6 +84,9 @@ Q_SIGNALS:
     void horizontalTileModeChanged();
     void verticalTileModeChanged();
 
+protected:
+    virtual void load();
+
 private:
     void setGridScaledImage(const QDeclarativeGridScaledImage& sci);
 
diff --git a/src/declarative/graphicsitems/qdeclarativeimage.cpp b/src/declarative/graphicsitems/qdeclarativeimage.cpp
index 33b38e0..338b086 100644
--- a/src/declarative/graphicsitems/qdeclarativeimage.cpp
+++ b/src/declarative/graphicsitems/qdeclarativeimage.cpp
@@ -300,6 +300,21 @@ void QDeclarativeImage::geometryChanged(const QRectF &newGeometry, const QRectF
     The URL may be absolute, or relative to the URL of the component.
 */
 
+/*!
+    \qmlproperty bool Image::asynchronous
+
+    Specifies that images on the local filesystem should be loaded
+    asynchronously in a separate thread.  The default value is
+    false, causing the user interface thread to block while the
+    image is loaded.  Setting \a asynchronous to true is useful where
+    maintaining a responsive user interface is more desireable
+    than having images immediately visible.
+
+    Note that this property is only valid for images read from the
+    local filesystem.  Images loaded via a network resource (e.g. HTTP)
+    are always loaded asynchonously.
+*/
+
 void QDeclarativeImage::paint(QPainter *p, const QStyleOptionGraphicsItem *, QWidget *)
 {
     Q_D(QDeclarativeImage);
diff --git a/src/declarative/graphicsitems/qdeclarativeimagebase.cpp b/src/declarative/graphicsitems/qdeclarativeimagebase.cpp
index 18053d3..a8cce3f 100644
--- a/src/declarative/graphicsitems/qdeclarativeimagebase.cpp
+++ b/src/declarative/graphicsitems/qdeclarativeimagebase.cpp
@@ -75,6 +75,23 @@ qreal QDeclarativeImageBase::progress() const
     return d->progress;
 }
 
+
+bool QDeclarativeImageBase::asynchronous() const
+{
+    Q_D(const QDeclarativeImageBase);
+    return d->async;
+}
+
+void QDeclarativeImageBase::setAsynchronous(bool async)
+{
+    Q_D(QDeclarativeImageBase);
+    if (d->async != async) {
+        d->async = async;
+        emit asynchronousChanged();
+    }
+}
+
+
 QUrl QDeclarativeImageBase::source() const
 {
     Q_D(const QDeclarativeImageBase);
@@ -94,23 +111,31 @@ void QDeclarativeImageBase::setSource(const QUrl &url)
     }
 
     d->url = url;
+    emit sourceChanged(d->url);
+
+    if (isComponentComplete())
+        load();
+}
+
+void QDeclarativeImageBase::load()
+{
+    Q_D(QDeclarativeImageBase);
     if (d->progress != 0.0) {
         d->progress = 0.0;
         emit progressChanged(d->progress);
     }
 
-    if (url.isEmpty()) {
+    if (d->url.isEmpty()) {
         d->pix = QPixmap();
         d->status = Null;
         setImplicitWidth(0);
         setImplicitHeight(0);
         emit statusChanged(d->status);
-        emit sourceChanged(d->url);
         emit pixmapChanged();
         update();
     } else {
         d->status = Loading;
-        QDeclarativePixmapReply::Status status = QDeclarativePixmapCache::get(d->url, &d->pix);
+        QDeclarativePixmapReply::Status status = QDeclarativePixmapCache::get(d->url, &d->pix, d->async);
         if (status != QDeclarativePixmapReply::Ready && status != QDeclarativePixmapReply::Error) {
             QDeclarativePixmapReply *reply = QDeclarativePixmapCache::request(qmlEngine(this), d->url);
             d->pendingPixmapCache = true;
@@ -147,7 +172,6 @@ void QDeclarativeImageBase::setSource(const QUrl &url)
             }
             d->progress = 1.0;
             emit statusChanged(d->status);
-            emit sourceChanged(d->url);
             emit progressChanged(d->progress);
             emit pixmapChanged();
             update();
@@ -163,7 +187,7 @@ void QDeclarativeImageBase::requestFinished()
 
     d->pendingPixmapCache = false;
 
-    if (QDeclarativePixmapCache::get(d->url, &d->pix) != QDeclarativePixmapReply::Ready)
+    if (QDeclarativePixmapCache::get(d->url, &d->pix, d->async) != QDeclarativePixmapReply::Ready)
         d->status = Error;
     setImplicitWidth(d->pix.width());
     setImplicitHeight(d->pix.height());
@@ -172,7 +196,6 @@ void QDeclarativeImageBase::requestFinished()
         d->status = Ready;
     d->progress = 1.0;
     emit statusChanged(d->status);
-    emit sourceChanged(d->url);
     emit progressChanged(1.0);
     emit pixmapChanged();
     update();
@@ -187,5 +210,12 @@ void QDeclarativeImageBase::requestProgress(qint64 received, qint64 total)
     }
 }
 
+void QDeclarativeImageBase::componentComplete()
+{
+    Q_D(QDeclarativeImageBase);
+    QDeclarativeItem::componentComplete();
+    if (d->url.isValid())
+        load();
+}
 
 QT_END_NAMESPACE
diff --git a/src/declarative/graphicsitems/qdeclarativeimagebase_p.h b/src/declarative/graphicsitems/qdeclarativeimagebase_p.h
index 47be139..c8c50ac 100644
--- a/src/declarative/graphicsitems/qdeclarativeimagebase_p.h
+++ b/src/declarative/graphicsitems/qdeclarativeimagebase_p.h
@@ -57,6 +57,7 @@ class Q_DECLARATIVE_EXPORT QDeclarativeImageBase : public QDeclarativeItem
     Q_PROPERTY(Status status READ status NOTIFY statusChanged)
     Q_PROPERTY(QUrl source READ source WRITE setSource NOTIFY sourceChanged)
     Q_PROPERTY(qreal progress READ progress NOTIFY progressChanged)
+    Q_PROPERTY(bool asynchronous READ asynchronous WRITE setAsynchronous NOTIFY asynchronousChanged)
 
 public:
     ~QDeclarativeImageBase();
@@ -67,13 +68,19 @@ public:
     QUrl source() const;
     virtual void setSource(const QUrl &url);
 
+    bool asynchronous() const;
+    void setAsynchronous(bool);
+
 Q_SIGNALS:
     void sourceChanged(const QUrl &);
     void statusChanged(Status);
     void progressChanged(qreal progress);
     void pixmapChanged();
+    void asynchronousChanged();
 
 protected:
+    virtual void load();
+    virtual void componentComplete();
     QDeclarativeImageBase(QDeclarativeImageBasePrivate &dd, QDeclarativeItem *parent);
 
 private Q_SLOTS:
diff --git a/src/declarative/graphicsitems/qdeclarativeimagebase_p_p.h b/src/declarative/graphicsitems/qdeclarativeimagebase_p_p.h
index d540e40..2e062a8 100644
--- a/src/declarative/graphicsitems/qdeclarativeimagebase_p_p.h
+++ b/src/declarative/graphicsitems/qdeclarativeimagebase_p_p.h
@@ -68,7 +68,8 @@ public:
     QDeclarativeImageBasePrivate()
       : status(QDeclarativeImageBase::Null),
         progress(0.0),
-        pendingPixmapCache(false)
+        pendingPixmapCache(false),
+        async(false)
     {
     }
 
@@ -76,7 +77,8 @@ public:
     QDeclarativeImageBase::Status status;
     QUrl url;
     qreal progress;
-    bool pendingPixmapCache;
+    bool pendingPixmapCache : 1;
+    bool async : 1;
 };
 
 QT_END_NAMESPACE
diff --git a/src/declarative/graphicsitems/qdeclarativeitem.cpp b/src/declarative/graphicsitems/qdeclarativeitem.cpp
index 5dd44fa..3db60ee 100644
--- a/src/declarative/graphicsitems/qdeclarativeitem.cpp
+++ b/src/declarative/graphicsitems/qdeclarativeitem.cpp
@@ -2604,7 +2604,6 @@ void QDeclarativeItem::setWidth(qreal w)
 
     prepareGeometryChange();
     d->width = w;
-    update();
 
     geometryChanged(QRectF(x(), y(), width(), height()),
                     QRectF(x(), y(), oldWidth, height()));
@@ -2641,7 +2640,6 @@ void QDeclarativeItem::setImplicitWidth(qreal w)
 
     prepareGeometryChange();
     d->width = w;
-    update();
 
     geometryChanged(QRectF(x(), y(), width(), height()),
                     QRectF(x(), y(), oldWidth, height()));
@@ -2676,7 +2674,6 @@ void QDeclarativeItem::setHeight(qreal h)
 
     prepareGeometryChange();
     d->height = h;
-    update();
 
     geometryChanged(QRectF(x(), y(), width(), height()),
                     QRectF(x(), y(), width(), oldHeight));
@@ -2713,7 +2710,6 @@ void QDeclarativeItem::setImplicitHeight(qreal h)
 
     prepareGeometryChange();
     d->height = h;
-    update();
 
     geometryChanged(QRectF(x(), y(), width(), height()),
                     QRectF(x(), y(), width(), oldHeight));
diff --git a/src/declarative/qml/qdeclarativecompiler.cpp b/src/declarative/qml/qdeclarativecompiler.cpp
index 0593a5d..b6ebd60 100644
--- a/src/declarative/qml/qdeclarativecompiler.cpp
+++ b/src/declarative/qml/qdeclarativecompiler.cpp
@@ -1326,6 +1326,16 @@ int QDeclarativeCompiler::findSignalByName(const QMetaObject *mo, const QByteArr
         if (methodName == name)
             return ii;
     }
+
+    // If no signal is found, but the signal is of the form "onBlahChanged",
+    // return the notify signal for the property "Blah"
+    if (name.endsWith("Changed")) {
+        QByteArray propName = name.mid(0, name.length() - 7);
+        int propIdx = mo->indexOfProperty(propName.constData());
+        if (propIdx >= 0)
+            return mo->property(propIdx).notifySignalIndex();
+    }
+
     return -1;
 }
 
diff --git a/src/declarative/util/qdeclarativepixmapcache.cpp b/src/declarative/util/qdeclarativepixmapcache.cpp
index c4b07cc..cfb25dd 100644
--- a/src/declarative/util/qdeclarativepixmapcache.cpp
+++ b/src/declarative/util/qdeclarativepixmapcache.cpp
@@ -79,6 +79,14 @@ inline uint qHash(const QUrl &uri)
 }
 #endif
 
+static QString toLocalFileOrQrc(const QUrl& url)
+{
+    QString r = url.toLocalFile();
+    if (r.isEmpty() && url.scheme() == QLatin1String("qrc"))
+        r = QLatin1Char(':') + url.path();
+    return r;
+}
+
 class QDeclarativeImageReaderEvent : public QEvent
 {
 public:
@@ -208,6 +216,7 @@ bool QDeclarativeImageRequestHandler::event(QEvent *event)
 
             // fetch
             if (url.scheme() == QLatin1String("image")) {
+                // Use QmlImageProvider
                 QImage image = QDeclarativeEnginePrivate::get(engine)->getImageFromProvider(url);
                 QDeclarativeImageReaderEvent::ReadError errorCode = QDeclarativeImageReaderEvent::NoError;
                 QString errorStr;
@@ -217,14 +226,36 @@ bool QDeclarativeImageRequestHandler::event(QEvent *event)
                 }
                 QCoreApplication::postEvent(runningJob, new QDeclarativeImageReaderEvent(errorCode, errorStr, image));
             } else {
-                QNetworkRequest req(url);
-                req.setAttribute(QNetworkRequest::HttpPipeliningAllowedAttribute, true);
-                QNetworkReply *reply = networkAccessManager()->get(req);
+                QString lf = toLocalFileOrQrc(url);
+                if (!lf.isEmpty()) {
+                    // Image is local - load/decode immediately
+                    QImage image;
+                    QDeclarativeImageReaderEvent::ReadError errorCode = QDeclarativeImageReaderEvent::NoError;
+                    QString errorStr;
+                    QFile f(lf);
+                    if (f.open(QIODevice::ReadOnly)) {
+                        QImageReader imgio(&f);
+                        if (!imgio.read(&image)) {
+                            errorStr = QLatin1String("Error decoding: ") + url.toString()
+                                          + QLatin1String(" \"") + imgio.errorString() + QLatin1String("\"");
+                            errorCode = QDeclarativeImageReaderEvent::Loading;
+                        }
+                    } else {
+                        errorStr = QLatin1String("Cannot open: ") + url.toString();
+                        errorCode = QDeclarativeImageReaderEvent::Loading;
+                    }
+                    QCoreApplication::postEvent(runningJob, new QDeclarativeImageReaderEvent(errorCode, errorStr, image));
+                } else {
+                    // Network resource
+                    QNetworkRequest req(url);
+                    req.setAttribute(QNetworkRequest::HttpPipeliningAllowedAttribute, true);
+                    QNetworkReply *reply = networkAccessManager()->get(req);
 
-                QMetaObject::connect(reply, replyDownloadProgress, runningJob, downloadProgress);
-                QMetaObject::connect(reply, replyFinished, this, thisNetworkRequestDone);
+                    QMetaObject::connect(reply, replyDownloadProgress, runningJob, downloadProgress);
+                    QMetaObject::connect(reply, replyFinished, this, thisNetworkRequestDone);
 
-                replies.insert(reply, runningJob);
+                    replies.insert(reply, runningJob);
+                }
             }
         }
         return true;
@@ -381,14 +412,6 @@ static bool readImage(QIODevice *dev, QPixmap *pixmap, QString &errorString)
     This class is NOT reentrant.
  */
 
-static QString toLocalFileOrQrc(const QUrl& url)
-{
-    QString r = url.toLocalFile();
-    if (r.isEmpty() && url.scheme() == QLatin1String("qrc"))
-        r = QLatin1Char(':') + url.path();
-    return r;
-}
-
 typedef QHash<QUrl, QDeclarativePixmapReply *> QDeclarativePixmapReplyHash;
 Q_GLOBAL_STATIC(QDeclarativePixmapReplyHash, qmlActivePixmapReplies);
 
@@ -500,40 +523,48 @@ bool QDeclarativePixmapReply::release(bool defer)
 
     Returns Ready, or Error if the image has been retrieved,
     otherwise the current retrieval status.
+
+    If \a async is false the image will be loaded and decoded immediately;
+    otherwise the image will be loaded and decoded in a separate thread.
+
+    Note that images sourced from the network will always be loaded and
+    decoded asynchonously.
 */
-QDeclarativePixmapReply::Status QDeclarativePixmapCache::get(const QUrl& url, QPixmap *pixmap)
+QDeclarativePixmapReply::Status QDeclarativePixmapCache::get(const QUrl& url, QPixmap *pixmap, bool async)
 {
     QDeclarativePixmapReply::Status status = QDeclarativePixmapReply::Unrequested;
+    QByteArray key = url.toEncoded(QUrl::FormattingOption(0x100));
+    QString strKey = QString::fromLatin1(key.constData(), key.count());
 
 #ifndef QT_NO_LOCALFILE_OPTIMIZED_QML
-    QString lf = toLocalFileOrQrc(url);
-    if (!lf.isEmpty()) {
-        status = QDeclarativePixmapReply::Ready;
-        if (!QPixmapCache::find(lf,pixmap)) {
-            QFile f(lf);
-            if (f.open(QIODevice::ReadOnly)) {
-                QString errorString;
-                if (!readImage(&f, pixmap, errorString)) {
-                    errorString = QLatin1String("Error decoding: ") + url.toString()
-                                  + QLatin1String(" \"") + errorString + QLatin1String("\"");
-                    qWarning() << errorString;
+    if (!async) {
+        QString lf = toLocalFileOrQrc(url);
+        if (!lf.isEmpty()) {
+            status = QDeclarativePixmapReply::Ready;
+            if (!QPixmapCache::find(strKey,pixmap)) {
+                QFile f(lf);
+                if (f.open(QIODevice::ReadOnly)) {
+                    QString errorString;
+                    if (!readImage(&f, pixmap, errorString)) {
+                        errorString = QLatin1String("Error decoding: ") + url.toString()
+                                      + QLatin1String(" \"") + errorString + QLatin1String("\"");
+                        qWarning() << errorString;
+                        *pixmap = QPixmap();
+                        status = QDeclarativePixmapReply::Error;
+                    }
+                } else {
+                    qWarning() << "Cannot open" << url;
                     *pixmap = QPixmap();
                     status = QDeclarativePixmapReply::Error;
                 }
-            } else {
-                qWarning() << "Cannot open" << url;
-                *pixmap = QPixmap();
-                status = QDeclarativePixmapReply::Error;
+                if (status == QDeclarativePixmapReply::Ready)
+                    QPixmapCache::insert(strKey, *pixmap);
             }
-            if (status == QDeclarativePixmapReply::Ready)
-                QPixmapCache::insert(lf, *pixmap);
+            return status;
         }
-        return status;
     }
 #endif
 
-    QByteArray key = url.toEncoded(QUrl::FormattingOption(0x100));
-    QString strKey = QString::fromLatin1(key.constData(), key.count());
     QDeclarativePixmapReplyHash::Iterator iter = qmlActivePixmapReplies()->find(url);
     if (iter != qmlActivePixmapReplies()->end() && (*iter)->status() == QDeclarativePixmapReply::Ready) {
         // Must check this, since QPixmapCache::insert may have failed.
diff --git a/src/declarative/util/qdeclarativepixmapcache_p.h b/src/declarative/util/qdeclarativepixmapcache_p.h
index c615254..b8949db 100644
--- a/src/declarative/util/qdeclarativepixmapcache_p.h
+++ b/src/declarative/util/qdeclarativepixmapcache_p.h
@@ -92,7 +92,7 @@ private:
 class Q_DECLARATIVE_EXPORT QDeclarativePixmapCache
 {
 public:
-    static QDeclarativePixmapReply::Status get(const QUrl& url, QPixmap *pixmap);
+    static QDeclarativePixmapReply::Status get(const QUrl& url, QPixmap *pixmap, bool async=false);
     static QDeclarativePixmapReply *request(QDeclarativeEngine *, const QUrl& url);
     static void cancel(const QUrl& url, QObject *obj);
     static int pendingRequests();