Make QQmlEngine take care of QQmlContext setup

Teach QQmlEnginePrivate to create QQmlContextData for object creation
purposes. This is necessary for both QQmlObjectCreator and qmltc's
generated code

Since tst_qmltc_manual used to test roughly the same code, replace the
test-local implementation with the new one

Task-number: QTBUG-84368
Change-Id: I58a1d4b259f42170d6dfb3809b7dd894bcbacbe1
Reviewed-by: Ulf Hermann <ulf.hermann@qt.io>

2 files changed, 20 insertions, 41 deletions

diff --git a/tests/auto/qml/qmltc_manual/testclasses.h b/tests/auto/qml/qmltc_manual/testclasses.h
index 2f1d8ed1ee..eecc9287ae 100644
--- a/tests/auto/qml/qmltc_manual/testclasses.h
+++ b/tests/auto/qml/qmltc_manual/testclasses.h
@@ -39,6 +39,7 @@
 
 #include <private/qqmlrefcount_p.h>
 #include <private/qqmlcontextdata_p.h>
+#include <private/qqmlengine_p.h>
 
 // utility class that sets up QQmlContext for passed QObject. can be used as a
 // base class to ensure that qmlEngine(object) is valid during initializer list
@@ -46,11 +47,28 @@
 struct ContextRegistrator
 {
     ContextRegistrator(QQmlEngine *engine, QObject *This);
+
     static QQmlRefPointer<QQmlContextData>
     create(QQmlEngine *engine, const QUrl &url,
-           const QQmlRefPointer<QQmlContextData> &parentContext, int index);
+           const QQmlRefPointer<QQmlContextData> &parentContext, int index)
+    {
+        // test-specific wrapping that is document-root-agnostic. calls proper
+        // creation for index == 0 and falls back to returning parentContext
+        // otherwise. the qmltc generates exactly that but with an implicit
+        // index check
+        if (index == 0) {
+            auto priv = QQmlEnginePrivate::get(engine);
+            return priv->createInternalContext(priv->compilationUnitFromUrl(url), parentContext, 0,
+                                               true);
+        }
+        return parentContext;
+    }
+
     static void set(QObject *This, const QQmlRefPointer<QQmlContextData> &context,
-                    QQmlContextData::QmlObjectKind kind);
+                    QQmlContextData::QmlObjectKind kind)
+    {
+        QQmlEnginePrivate::setInternalContext(This, context, kind);
+    }
 };
 
 class HelloWorld : public QObject, public ContextRegistrator
diff --git a/tests/auto/qml/qmltc_manual/tst_qmltc_manual.cpp b/tests/auto/qml/qmltc_manual/tst_qmltc_manual.cpp
index d4056c3628..5628b6e1d4 100644
--- a/tests/auto/qml/qmltc_manual/tst_qmltc_manual.cpp
+++ b/tests/auto/qml/qmltc_manual/tst_qmltc_manual.cpp
@@ -585,45 +585,6 @@ ContextRegistrator::ContextRegistrator(QQmlEngine *engine, QObject *This)
     Q_ASSERT(qmlEngine(This));
 }
 
-QQmlRefPointer<QQmlContextData>
-ContextRegistrator::create(QQmlEngine *engine, const QUrl &url,
-                           const QQmlRefPointer<QQmlContextData> &parentContext, int index)
-{
-    Q_ASSERT(index >= 0);
-    QQmlRefPointer<QQmlContextData> context;
-    if (index == 0) {
-        // create context the same way it is done in QQmlObjectCreator::create()
-        context = QQmlContextData::createRefCounted(parentContext);
-        context->setInternal(true);
-        auto unit = QQmlEnginePrivate::get(engine)->compilationUnitFromUrl(url);
-        context->setImports(unit->typeNameCache);
-        context->initFromTypeCompilationUnit(unit, index);
-    } else {
-        // non-root objects adopt parent context and use that one instead of
-        // creating own
-        context = parentContext;
-        // assume context is initialized in the root object
-    }
-    return context;
-}
-
-void ContextRegistrator::set(QObject *This, const QQmlRefPointer<QQmlContextData> &context,
-                             QQmlContextData::QmlObjectKind kind)
-{
-    Q_ASSERT(This);
-    QQmlData *ddata = QQmlData::get(This, /*create*/ true);
-
-    // NB: copied from QQmlObjectCreator::createInstance()
-    //
-    // the if-statement logic is: if (static_cast<quint32>(index) == 0 ||
-    // ddata->rootObjectInCreation || isInlineComponent) then
-    // QQmlContextData::DocumentRoot
-    context->installContext(ddata, kind);
-    if (kind == QQmlContextData::DocumentRoot)
-        context->setContextObject(This);
-    Q_ASSERT(qmlEngine(This));
-}
-
 HelloWorld::HelloWorld(QQmlEngine *e, QObject *parent)
     : QObject(parent), ContextRegistrator(e, this)
 {