Allow for QtQml and QtDeclarative to co-exist at run-time

This patch changes QQmlData to share the very first bit with QDeclarativeData,
to indicate if the QObject in question is exposed in the QML1 or QML2 run-time.

Task-number: QTBUG-35006

Change-Id: I3aa1d7c99038792011afd9f481ad30d9b981721f
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>
Reviewed-by: Lars Knoll <lars.knoll@digia.com>

1 files changed, 17 insertions, 4 deletions

diff --git a/src/qml/qml/qqmlengine.cpp b/src/qml/qml/qqmlengine.cpp
index 81ccec3571..d082b9a8fd 100644
--- a/src/qml/qml/qqmlengine.cpp
+++ b/src/qml/qml/qqmlengine.cpp
@@ -615,12 +615,18 @@ void QQmlPrivate::qdeclarativeelement_destructor(QObject *o)
 
 void QQmlData::destroyed(QAbstractDeclarativeData *d, QObject *o)
 {
-    static_cast<QQmlData *>(d)->destroyed(o);
+    QQmlData *ddata = static_cast<QQmlData *>(d);
+    if (ddata->ownedByQml1)
+        return;
+    ddata->destroyed(o);
 }
 
 void QQmlData::parentChanged(QAbstractDeclarativeData *d, QObject *o, QObject *p)
 {
-    static_cast<QQmlData *>(d)->parentChanged(o, p);
+    QQmlData *ddata = static_cast<QQmlData *>(d);
+    if (ddata->ownedByQml1)
+        return;
+    ddata->parentChanged(o, p);
 }
 
 class QQmlThreadNotifierProxyObject : public QObject
@@ -649,6 +655,7 @@ void QQmlData::signalEmitted(QAbstractDeclarativeData *, QObject *object, int in
 {
     QQmlData *ddata = QQmlData::get(object, false);
     if (!ddata) return; // Probably being deleted
+    if (ddata->ownedByQml1) return;
 
     // In general, QML only supports QObject's that live on the same thread as the QQmlEngine
     // that they're exposed to.  However, to make writing "worker objects" that calculate data
@@ -706,12 +713,18 @@ void QQmlData::signalEmitted(QAbstractDeclarativeData *, QObject *object, int in
 
 int QQmlData::receivers(QAbstractDeclarativeData *d, const QObject *, int index)
 {
-    return static_cast<QQmlData *>(d)->endpointCount(index);
+    QQmlData *ddata = static_cast<QQmlData *>(d);
+    if (ddata->ownedByQml1)
+        return 0;
+    return ddata->endpointCount(index);
 }
 
 bool QQmlData::isSignalConnected(QAbstractDeclarativeData *d, const QObject *, int index)
 {
-    return static_cast<QQmlData *>(d)->signalHasEndpoint(index);
+    QQmlData *ddata = static_cast<QQmlData *>(d);
+    if (ddata->ownedByQml1)
+        return false;
+    return ddata->signalHasEndpoint(index);
 }
 
 int QQmlData::endpointCount(int index)