Is there a list of QGraphicsItem types?

idlefrog

This is probably a rather nooby question, but for the life of me I can't find a page which lists all the type values for QGraphicsItems.
i.e. values returned from QGraphicsItem::type()

Of course I know I can extract a list from qgraphicsitem.h but isn't it formally documented somewhere?
Having searched the forum, I only see mention of qgraphicsitem_cast, and QGraphicsItem::Type.

Any help much appreciated!

Christian Ehrlicher

If you want to distinguish between your custom types and use qgraphicsitem_cast<> you have to define unique id's returned by type().

Christian Ehrlicher

No there is not. But why do you need it?

idlefrog

@Christian-Ehrlicher I'm trying to identify all the objects in the scene, and avoid placing a context menu over certain items. Although perhaps I should know what's in my scene and I have this back to front. But there are many items small & big.

JonB

@idlefrog
If you use woboq to look at the source for QGraphicsItem::type() you'll come across e.g.

class Q_WIDGETS_EXPORT QGraphicsEllipseItem
 enum { Type = 4 };
int type() const override;
int QGraphicsEllipseItem::type() const
{
    return Type;
}

in various files. So it's done via an "anonymous enum", defined in each derived class. I can't see anything which gathers those all together for you.

Christian Ehrlicher

But why you can't simply compare the type() integer with the ones you want to be able to show a context menu and use e.g. QGraphicsEllipseItem::Type instead an integer?

idlefrog

@Christian-Ehrlicher Well, I don't know what they are, or where they are made, and they don't have any object name. I'm trying to reverse engineer in a way. It seems as if I will have to add 'type()' methods to all the prime suspects, but it's not a systematic approach.

Which makes me think that perhaps my approach is all wrong here.
Anyhow, your help is much appreciated! Any suggestions are welcome :)

idlefrog

@JonB Thanks! Although for now, I'll just make do with grepping the qgraphicsitem.h if need be. Am currently reviewing / inspecting the code to understand it, and perhaps find out who's who in my scene!

Christian Ehrlicher

@idlefrog said in Is there a list of QGraphicsItem types?:

It seems as if I will have to add 'type()' methods to all the prime suspect

You're aware that such a function already exists? Still don't understand the problem.

idlefrog

@Christian-Ehrlicher Sorry, I probably am not being that clear. But I have a number of derived classes from QGraphicsItem, but even with the debugger can't identify them. So if I add 'type()' methods to those, I should start to identify the classes that I'm clicking on, and were they are. But knowing their base type is of course a start.

Christian Ehrlicher

If you want to distinguish between your custom types and use qgraphicsitem_cast<> you have to define unique id's returned by type().

idlefrog

@Christian-Ehrlicher Thanks... am just starting to do that. Although I wondering how best to allocate the ID's without creating some god enum object. So I may just for settle on picking unique/random IDs for just those that I suspect are under the cursor.

Christian Ehrlicher

Noone stops you from defining an enum by yourself starting with Qt::UserType.