1 files changed, 63 insertions, 0 deletions
diff --git a/src/qml/qmltc/qqmltcobjectcreationhelper.cpp b/src/qml/qmltc/qqmltcobjectcreationhelper.cpp
new file mode 100644
index 0000000000..bab86de1b9
--- /dev/null
+++ b/src/qml/qmltc/qqmltcobjectcreationhelper.cpp
@@ -0,0 +1,63 @@
+// Copyright (C) 2022 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
+
+#include "qqmltcobjectcreationhelper_p.h"
+
+#include <private/qqmlmetatype_p.h>
+#include <private/qmetaobjectbuilder_p.h>
+#include <private/qobject_p.h>
+#include <private/qqmltype_p_p.h>
+
+QT_BEGIN_NAMESPACE
+
+void qmltcCreateDynamicMetaObject(QObject *object, const QmltcTypeData &data)
+{
+    // TODO: when/if qmltc-compiled types would be registered via
+    // qmltyperegistrar, instead of creating a dummy QQmlTypePrivate, fetch the
+    // good QQmlType via QQmlMetaType::qmlType(). to do it correctly, one needs,
+    // along with the meta object, module name and revision. all that should be
+    // available ahead-of-time to qmltc.
+    auto qmlTypePrivate = new QQmlTypePrivate(data.regType);
+
+    // tie qmlTypePrivate destruction to objects's destruction. the type's
+    // content is not needed once the associated object is deleted
+    QObject::connect(object, &QObject::destroyed, object,
+                     [qmlTypePrivate](QObject *) { qmlTypePrivate->release(); },
+                     Qt::DirectConnection);
+
+    // initialize QQmlType::QQmlCppTypeData
+    Q_ASSERT(data.regType == QQmlType::CppType);
+    qmlTypePrivate->extraData.cppTypeData->allocationSize = data.allocationSize;
+    qmlTypePrivate->extraData.cppTypeData->newFunc = nullptr;
+    qmlTypePrivate->extraData.cppTypeData->userdata = nullptr;
+    qmlTypePrivate->extraData.cppTypeData->noCreationReason =
+            QStringLiteral("Qmltc-compiled type is not creatable via QQmlType");
+    qmlTypePrivate->extraData.cppTypeData->createValueTypeFunc = nullptr;
+    qmlTypePrivate->extraData.cppTypeData->parserStatusCast = -1;
+    qmlTypePrivate->extraData.cppTypeData->extFunc = nullptr;
+    qmlTypePrivate->extraData.cppTypeData->extMetaObject = nullptr;
+    qmlTypePrivate->extraData.cppTypeData->customParser = nullptr;
+    qmlTypePrivate->extraData.cppTypeData->attachedPropertiesFunc = nullptr;
+    qmlTypePrivate->extraData.cppTypeData->attachedPropertiesType = nullptr;
+    qmlTypePrivate->extraData.cppTypeData->propertyValueSourceCast = -1;
+    qmlTypePrivate->extraData.cppTypeData->propertyValueInterceptorCast = -1;
+    qmlTypePrivate->extraData.cppTypeData->finalizerCast = -1;
+    qmlTypePrivate->extraData.cppTypeData->registerEnumClassesUnscoped = false;
+    qmlTypePrivate->extraData.cppTypeData->registerEnumsFromRelatedTypes = false;
+
+    qmlTypePrivate->baseMetaObject = data.metaObject;
+
+    QQmlType qmlType(qmlTypePrivate);
+    Q_ASSERT(qmlType.isValid());
+
+    QObjectPrivate *op = QObjectPrivate::get(object);
+    // ### inefficient - rather, call this function only once for the leaf type
+    if (op->metaObject) {
+        delete op->metaObject;
+        op->metaObject = nullptr;
+    }
+
+    qmlType.createProxy(object);
+}
+
+QT_END_NAMESPACE