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. qt4 - How to get sender widget with a signal/slot ... It's possible to bind more than one signal to one slot (isn't?). So, is there a way to understand which widget sends the signal? I'm looking for something like sender argument of events in .NET [SOLVED]How to get emitter of a signal in the slot? | Qt Forum Hi, Currently I have five QListEdit widgets in a widget of my program. I need to connect their editingFinished() signal to a shared slot, but they have to be distinguished inside the slot. I guess it's impossible to get emitter of a signal in Qt, but writ...
qt - Sender in signal-to-signal connection - Stack Overflow
Qt allows us to connect multiple signals to the same signal or slot. This can be useful when we provide the user with many ways of performing the same operation. Sometimes, however, we would like the slot to behave slightly differently depending on which widget invoked it. Signals and Slots in Qt5 - Woboq As you might have seen in the previous example, the slot was just declared as public and not as slot. Qt will indeed call directly the function pointer of the slot, and will not need moc introspection anymore. (It still needs it for the signal) But what we can also do is connecting to any function or functor: Signals & Slots — Qt for Python
Сигналы и слоты в Qt / Хабр
Multithreading - Qt send signal to different thread Tag: multithreading,qt,signals,slot. I have searched SO for this question, but they were a bit different than mine.When the signal is emited, i get: ASSERT failure in QCoreApplication::sendEvent: "Cannot send events to objects owned by a different thread. Сигналы и слоты в Qt: установка, особенности работы,… Qt сигналы и слоты помогают включить ориентированную на событие функцию в графические пользовательские интерфейсы приложений.Сигналы и слоты сделали Qt увлекательным и инновационным инструментом. Это метод, в которым «один объект» гарантирует, что когда... Как работают сигналы и слоты в Qt Сигналы и слоты, а также система свойств Qt, основываются на возможностях самоанализа объектов во время выполнения программы. Самоанализ означает способность перечислить методы и свойства объекта и иметь всю информацию про них, в частности... Using Qt with 3rd Party Signals and Slots
Кто послал сигнал в слот? - русский QT форум.connect(ui->cbMember, SIGNAL(editTextChanged(const QString &)), this, SLOT(formMembersList(const QString &)))QT 4.6.2, QT Creator. как написано выше - можно смотреть QObject::sender() но!
Qt signal and slot equivalent in c#? - social.msdn.microsoft.com Hi All, I need to know the QT signal equivalent in c#.I analysed about the Qt Signal and slot concept,think which is similer to Delegate and events.But i have a doubt in Deleghate and events.I will mentioned the doubt by code snippet(in Qt) Qt for Beginners - Qt Wiki assuming that FooObjectA have a bared signal, and FooObjectB have a baz slot. You have to write the signature of the signal and the slot inside the two macros SIGNAL and SLOT. If you want to get some information about what these macros do, please read the last section of this chapter. [Solved] Problem with signal/slot carrying pointer - qt ... I have class A, which dynamically allocates an instance of class B when a method is called, and emits a signal which carries the instance of B. In another class named handler, I have a slot which recives an object of type B. And in the main function, I connect them like this: connect(a, SIGNAL(changed(B*)), handler, SLOT(process(B*))); Qt: Part2 -- Signal & Slot - C/C++ Tutorials - Codecall
Support for Signals and Slots — PyQt 5.11 Reference Guide
How to identify which signal called the slot? | Qt Forum The only way is to pass that info as a signal/slot parameter. It goes against the design of signals/slots to do so though. Receiver should not have to know anything about the sender, and, in particular, there might not be a sender at all if the slot was called directly. c++ - Qt: Signal main thread - Stack Overflow I can emit from this thread, but only if I connect the slot using Qt::DirectConnection. The upshot is that QObject::sender() in the SLOT will always return NULL. I wish to call deleteLater() for instance, but that can only be scheduled in a QThread. I think I need to get back to the main thread, but how can I signal the object on the main thread? Reasons for signal/slot connection with sender == receiver ... Also by passing Qt::QueuedConnection, you enforce the event to go through the event loop, which isn't necessary in most cases (think also copying of the slot's arguments), and furthermore it may cause out of order execution in your emitting object in some rare cases (i.e. when there's a lot of ping-ponging of signals and slots). Signals & Slots | Qt Core 5.10
Особенности Qt: слоты и сигналы, описание QObject... Вводная часть: Qt – это не только элементы графического интерфейса. Этот фреймворк представляет собой взаимосвязанную систему. Родственность Qt-объектов осуществляется через наследование класса... New Signal Slot Syntax/ru - Qt Wiki