Provide a way to statically register namespaces

Previously, qmltyperegistrar would stumble over any QML_* macros in
namespaces, as the namespaces could not be used as template arguments.
However, namespaces are intended to be usable by QML as uncreatable
"types".

Now, qmltyperegistrar checks the namespace flag that moc records in the
JSON output, and if that is given, registers an uncreatable metaobject
instead of a type. Therefore you can use QML_ELEMENT and friends to
register namespaces, just like you would register classes (except that
they're implicitly uncreatable, of course).

Task-number: QTBUG-68796
Change-Id: I186d7e9425471c32fb1a1f29c0c0b946afb2a9d2
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>

5 files changed, 76 insertions, 12 deletions

diff --git a/tests/auto/qml/qqmllanguage/data/cppstaticnamespace.2.qml b/tests/auto/qml/qqmllanguage/data/cppstaticnamespace.2.qml
new file mode 100644
index 0000000000..3b37c29b18
--- /dev/null
+++ b/tests/auto/qml/qqmllanguage/data/cppstaticnamespace.2.qml
@@ -0,0 +1,5 @@
+import StaticTest 1.0
+
+MyStaticSecondNamespacedType {
+    list: [ MyStaticNamespacedType {} ]
+}
diff --git a/tests/auto/qml/qqmllanguage/data/cppstaticnamespace.qml b/tests/auto/qml/qqmllanguage/data/cppstaticnamespace.qml
new file mode 100644
index 0000000000..2778baadb9
--- /dev/null
+++ b/tests/auto/qml/qqmllanguage/data/cppstaticnamespace.qml
@@ -0,0 +1,6 @@
+import StaticTest 1.0
+
+MyStaticNamespacedType {
+    myEnum: MyStaticNamespace.Key5
+    property int intProperty: MyStaticNamespace.MyOtherNSEnum.OtherKey2
+}
diff --git a/tests/auto/qml/qqmllanguage/qqmllanguage.pro b/tests/auto/qml/qqmllanguage/qqmllanguage.pro
index 724a27320c..6c54525544 100644
--- a/tests/auto/qml/qqmllanguage/qqmllanguage.pro
+++ b/tests/auto/qml/qqmllanguage/qqmllanguage.pro
@@ -1,4 +1,7 @@
-CONFIG += testcase
+CONFIG += testcase qmltypes
+QML_IMPORT_NAME = StaticTest
+QML_IMPORT_VERSION = 1.0
+
 TARGET = tst_qqmllanguage
 macx:CONFIG -= app_bundle
 
diff --git a/tests/auto/qml/qqmllanguage/testtypes.h b/tests/auto/qml/qqmllanguage/testtypes.h
index 148179cb9c..8852bf7af9 100644
--- a/tests/auto/qml/qqmllanguage/testtypes.h
+++ b/tests/auto/qml/qqmllanguage/testtypes.h
@@ -750,6 +750,47 @@ private:
     bool m_ownRWObj;
 };
 
+namespace MyStaticNamespace {
+    Q_NAMESPACE
+    QML_ELEMENT
+
+    enum MyNSEnum {
+        Key1 = 1,
+        Key2,
+        Key5 = 5
+    };
+    Q_ENUM_NS(MyNSEnum);
+
+    enum class MyOtherNSEnum {
+        OtherKey1 = 1,
+        OtherKey2
+    };
+    Q_ENUM_NS(MyOtherNSEnum);
+
+
+    class MyNamespacedType : public QObject
+    {
+        Q_OBJECT
+        Q_PROPERTY(MyStaticNamespace::MyNSEnum myEnum MEMBER m_myEnum)
+        QML_NAMED_ELEMENT(MyStaticNamespacedType)
+        MyStaticNamespace::MyNSEnum m_myEnum = MyNSEnum::Key1;
+    };
+
+    class MySecondNamespacedType : public QObject
+    {
+        Q_OBJECT
+        Q_PROPERTY(QQmlListProperty<MyStaticNamespace::MyNamespacedType> list READ list)
+        QML_NAMED_ELEMENT(MyStaticSecondNamespacedType)
+    public:
+        QQmlListProperty<MyNamespacedType> list()
+        {
+            return QQmlListProperty<MyNamespacedType>(this, &m_list);
+        }
+
+    private:
+        QList<MyNamespacedType *> m_list;
+    };
+}
 
 namespace MyNamespace {
     Q_NAMESPACE
diff --git a/tests/auto/qml/qqmllanguage/tst_qqmllanguage.cpp b/tests/auto/qml/qqmllanguage/tst_qqmllanguage.cpp
index bd23806e3a..4d4056ba3f 100644
--- a/tests/auto/qml/qqmllanguage/tst_qqmllanguage.cpp
+++ b/tests/auto/qml/qqmllanguage/tst_qqmllanguage.cpp
@@ -1858,21 +1858,30 @@ void tst_qqmllanguage::valueTypes()
 
 void tst_qqmllanguage::cppnamespace()
 {
-    {
-        QQmlComponent component(&engine, testFileUrl("cppnamespace.qml"));
+    QScopedPointer<QObject> object;
+
+    auto create = [&](const char *file) {
+        QQmlComponent component(&engine, testFileUrl(file));
         VERIFY_ERRORS(0);
-        QScopedPointer<QObject> object(component.create());
+        object.reset(component.create());
         QVERIFY(object != nullptr);
+    };
 
-        QCOMPARE(object->property("intProperty").toInt(), (int)MyNamespace::MyOtherNSEnum::OtherKey2);
-    }
+    auto createAndCheck = [&](const char *file) {
+        create(file);
+        return !QTest::currentTestFailed();
+    };
 
-    {
-        QQmlComponent component(&engine, testFileUrl("cppnamespace.2.qml"));
-        VERIFY_ERRORS(0);
-        QScopedPointer<QObject> object(component.create());
-        QVERIFY(object != nullptr);
-    }
+    QVERIFY(createAndCheck("cppnamespace.qml"));
+    QCOMPARE(object->property("intProperty").toInt(),
+             (int)MyNamespace::MyOtherNSEnum::OtherKey2);
+
+    QVERIFY(createAndCheck("cppstaticnamespace.qml"));
+    QCOMPARE(object->property("intProperty").toInt(),
+             (int)MyStaticNamespace::MyOtherNSEnum::OtherKey2);
+
+    QVERIFY(createAndCheck("cppnamespace.2.qml"));
+    QVERIFY(createAndCheck("cppstaticnamespace.2.qml"));
 }
 
 void tst_qqmllanguage::aliasProperties()