[Development] potential bug with qml context properties

[Nurmi J-P]

On Sep 23, 2013, at 6:12 PM, Matt Broadstone <mbroadst at gmail.com> wrote:

> On Fri, Sep 20, 2013 at 9:57 AM, Matt Broadstone <mbroadst at gmail.com> wrote:
> Hi,
> I'm running into a strange error related to context properties in qml. Basically, I'm trying to expose a QQmlPropertyMap into the context of my QQmlApplicationEngine, and within the qml set up a "recursive" binding so that changes to that map from C++ are expressed in qml, and vica versa. This was not difficult to achieve, however, I keep getting ReferenceErrors stating that the context property is not defined (even though setting singleshot timer to change the map indeed reflects a change in the qml scene), not to mention a slightly less annoying (but annoying nonetheless) warning that I've set up a recursive binding. I'm wondering if this is a bug, or if I'm just doing something wrong. 
> 
> I have a very simple example of what I'm trying to do posted on these two pastebins, if someone has a second to take a look that'd be great:
> 
> (c++) http://pastebin.com/S7XeYHEG
> (qml) http://pastebin.com/THsPsVkM
> 
> 
> Any follow up on this from the qml guys? Should I be targeting a qml specific ML? 

Hi Matt,

Set the context property first, and then load the QML and it should work:

    QQmlApplicationEngine engine;
    QQmlContext *ctxt = engine.rootContext();
    ctxt->setContextProperty("testData", object.propertyMap());    
    engine.load(QUrl::fromLocalFile("main.qml"));

--
J-P Nurmi