QML: Allow named lists of value types

We register QList<T> as sequential container type for any value type T
we get. This way we can always find a type to use for list<t> with t
being a value type. The metatypes are shuffled around so that we have an
easier time associating a type with its list and vice versa.

As QQmlPropertyData's isQList flag denotes both QQmlListProperty<T> and
QList<T> now, we need to use QMetaType::IsQmlList more often.

Conversely, any name given to extra sequential containers registered via
QML_SEQUENTIAL_CONTAINER is explicitly ignored now. As you can do
list<foo> for any type foo now, there is not much of a point in having
further named container registrations for the same type. It would just
make things more complicated. Mind that the name had already been
ignored before, just not explicitly.

[ChangeLog][QtQml] You can now use lists of value types in QML. For
example a property of type list<int> will hold a list of integers.

Task-number: QTBUG-82443
Change-Id: I7bee61cee3963dae5d231bf59f70b8012984371d
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>

1 files changed, 3 insertions, 1 deletions

diff --git a/src/qml/qml/qqmlmetatype_p.h b/src/qml/qml/qqmlmetatype_p.h
index aaa8bafada..1fb4d915da 100644
--- a/src/qml/qml/qqmlmetatype_p.h
+++ b/src/qml/qml/qqmlmetatype_p.h
@@ -172,6 +172,8 @@ public:
     static QQmlType qmlTypeById(int qmlTypeId);
 
     static QQmlType qmlType(QMetaType metaType);
+    static QQmlType qmlListType(QMetaType metaType);
+
     static QQmlType qmlType(const QUrl &unNormalizedUrl, bool includeNonFileImports = false);
 
     static QQmlRefPointer<QQmlPropertyCache> propertyCache(
@@ -198,7 +200,7 @@ public:
 
     static QObject *toQObject(const QVariant &, bool *ok = nullptr);
 
-    static QMetaType listType(QMetaType type);
+    static QMetaType listValueType(QMetaType type);
     static QQmlAttachedPropertiesFunc attachedPropertiesFunc(QQmlEnginePrivate *,
                                                              const QMetaObject *);
     static bool isInterface(QMetaType type);