There are certain QObject macros and conventions that are for use in private Qt APIs only. This page describes them.
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Slots conceptually are public interface, since their main purpose is inter-object communication. If you really need a function to be private that function shouldn't be a slot too, it should be just a private member function (if call that function internally you you just call the function, you don't need a connection for that).
Q_PRIVATE_PROPERTY
Introduced here.
Qt Private Slots
This macro is used when you have a C++ class that is public that exposes a property whose type is not public. For example, QQuickItem is a public C++ class that exposes an anchors property, whose type is the private QQuickAnchors class: The magic of crystals.
In this case, the macro expects there to be a getter named anchors() in the type returned by QQuickItem::d_func(), which there is:
When using this macro, it's necessary to include the generated moc file at the end of the corresponding .cpp file:
Private Slots
If you don't do this, you may see an error like the following (example taken from another class -- replace popup with item and it's the same error):
Q_PRIVATE_SLOT
Similar to Q_PRIVATE_PROPERTY, Q_PRIVATE_SLOT is used when you have a slot in a private class that you want to be considered part of the API of the corresponding public class, without affecting the interface (and hence binary compatibility) of that public class. Using QQuickItem as an example again, Q_PRIVATE_SLOT is used to declare this private slot in qquickitem.h:
The slot itself is declared in qquickitem_p.h:
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