Qt signaleert de retourwaarde van slots

Jul 09, 2011 · Here, I want to briefly discuss how the same effect can be achieved with Qt itself. C++ is not as dynamic as Python, so Python's approaches of using lambda or functools.partial won't work [1] . Fortunately, the Qt folks provided a solution that can make passing extra arguments to slots relatively simple.

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. The recommended way of working with threads in Qt has changed since the documentation was written. It is usually better not to add signals, let alone slots, to QThread. Instead, create a QObject (derived) instance, and call moveToThread on it to move it to the thread. Put your signals and slots in this worker object instead. The signal/slot mechanism in Qt, is a static mechanism. The classes have to be preprocessed by the moc compiler. Now I want to create signals and slots dynamically at run-time. I already have a working solution, but it feels to me like a hack, although I am using publicly available methods. This is the code for dynamic slots: The Qt::QueuedConnection will ensure that the Slot is called in the thread of the corresponding QObject. It uses the fact, that every thread in Qt ( QThread ) has a Event-queue by default. So if you call the Signal of the QObject the method generated by Qt will enqueue the command to call the Slot in the Event-queue of the other QObjects thread.

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A comunicação entre os widgets, no Qt, é feita através de sinais (signals) e slots. O mecanismo para ligar um sinal a um slot é através da função connect : QObject :: connect ( p_widget1 , … The signal/slot mechanism in Qt, is a static mechanism. The classes have to be preprocessed by the moc compiler. Now I want to create signals and slots dynamically at run-time. I already have a working solution, but it feels to me like a hack, although I am using publicly available methods. This is the code for dynamic slots:

Looking through the Qt source it seems that when a slot is called from QMetaObject::invokeMethod the return type can be specified and the return value obtained. (Have a look at invokeMethod in the Qt help) I could not find many examples of this actually being used in the Qt source. One I found was. bool QAbstractItemDelegate::helpEvent

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In Qt Designer's signals and slots editing mode, you can connect objects in a form together using Qt's signals and slots mechanism. Both widgets and layouts can be connected via an intuitive connection interface, using the menu of compatible signals and slots provided by Qt Designer. When a form is saved, all connections are preserved so that they will be ready for use when your project is built.

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