Qt Slot Derived Class

  1. Qt Slot Derived Classes
  2. Qt Slot Derived Class Example

Detailed Description. The QObject class is the base class of all Qt objects. QObject is the heart of the Qt Object Model.The central feature in this model is a very powerful mechanism for seamless object communication called signals and slots. Support for QtCore.Signal, QtCore.Slot and QtCore.Property, including the creation of a dynamic QMetaObject. Features with wrapper generator. PythonQt offers the additional PythonQtQtAll library which wraps the complete Qt API, including all C classes and all non-slots on QObject derived classes. This offers the following features. Signals and slots are loosely coupled: A class which emits a signal neither knows nor cares which slots receive the signal. Qt's signals and slots mechanism ensures that if you connect a signal to a slot, the slot will be called with the signal's parameters at the right time. Signals and slots can take any number of arguments of any type. @Asperamanca said in Disconnect all incoming and outgoing connections from QObject-derived class manually. He QGraphicsItem destructor of the parent item (which runs before the QObject destructor) destroys the child, which fires a signal to tell the world text editing was canceled, which calls the slot in my already half-destroyed parent item.

Qt Slot Derived Classes

QDBusAbstractAdaptor uses the standard QObject mechanism of signals, slots and properties to determine what signals, methods and properties to export to the bus. Any signal emitted by QDBusAbstractAdaptor-derived classes will be automatically be relayed through any D-Bus connections the object is registered on.


I’ve been using Qt for several years now in a couple different projects. Only today did I learn about QMetaObject::connectSlotsByName.

As the documentation states, this function will recursively search the given object for signals matching the format of:

Qt Slot Derived Class Example

If you’re using Qt Designer and MOC’ing, this fuction gets called automatically in your ui_<mainwindow>.h file inside of setupUi(). This means that you don’t have to manually connect the objects in your .ui files. I didn’t know this! You can simply do something like:

And that’s it! You don’t have to define the signals/slots in Designer, you don’t have to manually connect them (as I had been doing). Nothing! It just works!

I had never seen this mentioned in any tutorial or even code examples. I only stumbled upon it when looking at another project for something completely unrelated. But this is a great time saver! Casino jas de bouffan drive.