Add QJSEngine::newQMetaObject

QJSEngine::newQMetaObject let us expose QMetaObject to the QJSEngine,
allowing to construct QObjects instance from javascript.

Additionally, enums values are exposed as property of the QMetaObject
wrapper.

(The engine takes ownership of the created objects)

Change-Id: I5428d4b7061cceacfa89f51e703dce3379b2c329
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>

1 files changed, 36 insertions, 0 deletions

diff --git a/src/qml/jsapi/qjsvalue.cpp b/src/qml/jsapi/qjsvalue.cpp
index 4860908bd3..44746b8c2b 100644
--- a/src/qml/jsapi/qjsvalue.cpp
+++ b/src/qml/jsapi/qjsvalue.cpp
@@ -1234,6 +1234,28 @@ QObject *QJSValue::toQObject() const
 }
 
 /*!
+  \since 5.8
+
+ * If this QJSValue is a QMetaObject, returns the QMetaObject pointer
+ * that the QJSValue represents; otherwise, returns 0.
+ *
+ * \sa isQMetaObject()
+ */
+const QMetaObject *QJSValue::toQMetaObject() const
+{
+    QV4::ExecutionEngine *engine = QJSValuePrivate::engine(this);
+    if (!engine)
+        return 0;
+    QV4::Scope scope(engine);
+    QV4::Scoped<QV4::QMetaObjectWrapper> wrapper(scope, QJSValuePrivate::getValue(this));
+    if (!wrapper)
+        return 0;
+
+    return wrapper->metaObject();
+}
+
+
+/*!
   Returns a QDateTime representation of this value, in local time.
   If this QJSValue is not a date, or the value of the date is NaN
   (Not-a-Number), an invalid QDateTime is returned.
@@ -1286,4 +1308,18 @@ bool QJSValue::isQObject() const
     return val && val->as<QV4::QObjectWrapper>() != 0;
 }
 
+/*!
+  \since 5.8
+
+  Returns true if this QJSValue is a QMetaObject; otherwise returns
+  false.
+
+  \sa toQMetaObject(), QJSEngine::newQMetaObject()
+*/
+bool QJSValue::isQMetaObject() const
+{
+    QV4::Value *val = QJSValuePrivate::getValue(this);
+    return val && val->as<QV4::QMetaObjectWrapper>() != 0;
+}
+
 QT_END_NAMESPACE