QtQml: Make QLocale an actual value type

We want to be accessible to qmllint and other QML tooling. To this end,
make all legal invocations of its methods properly typed invokables.
Keep two QQmlV4Function overloads to produce error messages if the
methods are called with the wrong parameters. We have to do this because
JavaScript is more liberal in its argument coercion than the methods
would like.

Un-deprecate QJSNumberCoercion::isInteger() since it's actually quite
practical here.

Pick-to: 6.7
Fixes: QTBUG-112366
Change-Id: I016e5edc47efaade44461c504c1b3e2b1b829b58
Reviewed-by: Oliver Eftevaag <oliver.eftevaag@qt.io>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Ulf Hermann <ulf.hermann@qt.io>
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>

1 files changed, 11 insertions, 0 deletions

diff --git a/src/qml/qml/qqmlvaluetypewrapper_p.h b/src/qml/qml/qqmlvaluetypewrapper_p.h
index df173e6325..5b3894a07f 100644
--- a/src/qml/qml/qqmlvaluetypewrapper_p.h
+++ b/src/qml/qml/qqmlvaluetypewrapper_p.h
@@ -120,6 +120,17 @@ public:
             ExecutionEngine *engine, const void *, const QMetaObject *metaObject, QMetaType type);
 
     QVariant toVariant() const;
+
+    template<typename ValueType>
+    ValueType *cast()
+    {
+        if (QMetaType::fromType<ValueType>() != d()->metaType())
+            return nullptr;
+        if (d()->isReference() && !readReferenceValue())
+            return nullptr;
+        return static_cast<ValueType *>(d()->gadgetPtr());
+    }
+
     bool toGadget(void *data) const;
     bool isEqual(const QVariant& value) const;
     int typeId() const;