[Qt-qml] QML Query

[bea.lam at nokia.com]

Hi,

On 25/01/2011, at 7:02 PM, ext Dumb Acnt wrote:

> Hi All,
> 
> I had a quick QML question that I wanted to bounce off of you all.
> 
> I was looking at the minehunt [http://doc.qt.nokia.com/latest/demos-declarative-minehunt.html] Qt declarative example and am able to see good application of this in my application.
> 
> However I have a slight deviation from the data structure point of view here. I would like to make the TileData class in the minehunt example to be a composition of other QObject derived classes which will also expose their properties to the QML view.
> 
> However I have failed to do so as once a class is make to derive from QObject it can no longer be copied and hence can not have a READ Q_PROPERTY for the QML view to come and read it. Unless I am assuming we make it a pointer. However this as well does not seem to work for me. Here is what I am thinking of about extending the TileData class.

Yes, the property needs to be a pointer. The property declaration in TileData should look like this:

	Q_PROPERTY (TileType* tileType READ tileType NOTIFY tileTypeChanged)

Also the TileType class must be registered using qmlRegisterType() in main.cpp, like it is for the TileData class.


This part of the "Extending QML from C++" tutorial might be useful: 

http://doc.qt.nokia.com/4.7-snapshot/declarative-tutorials-extending-chapter4-custompropertytypes.html


regards,

Bea