Hi,
This is a result of QVariant being a value type. If you make a copy and modify
it, then the original remains as-is. The call to setContextProperty creates a
copy. If you want explicitly shared data between the JavaScript environment and
C++ then I would recommend using a JavaScript object - accessed from C++ as
QJSValue, because those are explicitly shared.
Simon
Original Message
From: Gerhard Scheikl
Sent: Sunday, June 14, 2015 19:43
To: development@qt-project.org
Subject: [Development] QVariantMap <-> QML
Hi
I recently discovered some unexpected behavior when exchanging a QVariantMap
with QML code:
Here's what I'm doing on the C++ side:
my_map = json_document.toVariant();
engine.rootContext()->setContextProperty("myMap", my_map);
Then on the QML side:
myMap.asdf.name = "asdf"
This change is not reflected in the original map.
Obviously, accessing asdf.name returns a copy.
Is this the intended behavior?
If so, how can I ensure that the data in C++ and on the QML side is always the
same?
(use QJSValue? use a QObject hierarchy with dynamic properties?)
Thanks!
Best regards
Gerhard
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