[Solved] Warning: Class implements the interface QGraphicsItem but does not list it in Q_INTERFACES

[xtingray]

Currently I am studying some code that I didn't write and when I compile it I got the warning message of the subject.
I was checking some documents about plugins but I couldn't find nothing conclusive about it.
I'm just curious what that means? How can I avoid it?

Thanks for any hint.

[Guest]

You can check how its used in Qt sources or you could also lookup Q_INTERFACES in the Qt Assistant which says,

bq.
@
class BasicToolsPlugin : public QObject,
public BrushInterface,
public ShapeInterface,
public FilterInterface
{
Q_OBJECT
Q_INTERFACES(BrushInterface ShapeInterface FilterInterface)

public:
...
};
@

[xtingray]

Finally I figured out what is going on here. It seems that this Warning shows up when a class inherits from both QObject AND QGraphicsItem, like this:

@
class KControlNode : public QObject, public QGraphicsItem
@

I think so, because when I changed it for:

@
class KControlNode : public QGraphicsItem
@

and compile the source code again, the Warning disappears :)