Maybe you can subclass QAction with an m_increase member variable. Connect the triggered() signal to a slot on your new QAction subclass and emit a new signal (e.g. triggered(int number)) with the correct parameter. Differences between String-Based and Functor-Based Connections | Qt 5.12 From Qt 5.0 onwards, Qt offers two different ways to write signal-slot connections in C++: The string-based connection syntax and the functor-based connection syntax. There are pros and cons to both syntaxes. The table below summarizes their differences. How to pass parameters to a SLOT function? | Qt Forum You cannot control what will be sent through the signal in the connect statement - only the sender itself uses "emit" keyword (well, can use it) and provides concrete argument (QPushButton pointer in your case).
Connecting signals to slots with less params allowed in Qt
How Qt Signals and Slots Work The Qt signals/slots and property system are based on the ability to introspect the objects at runtime. Introspection means being able to list the methods and properties of an object and have all kinds of information about them such as the type of their arguments. QtScript and QML would have hardly... qt - Как мы можем соединить сигналы и слот... -… В Qt, сигналы и слоты требуют соответствия типов аргументов: QObject :: подключить: Несовместимые отправитель / аргументы приемникаПодпись сигнала должна совпадать с подписью принимающего слота. (Фактически, слот может иметь более короткую сигнатуру, чем... Qt: Emit same signal from one object but with different …
Signals & Slots — Qt for Python
I have a simple question guys, reading the thread about connecting signals with slots with fewer arguments, and of course, the Qt documentation.. However, I do not need to connect signals with slots. I actually want to connect signals with signals with fewer arguments.. The documentation is very clear about slots, but what about signals? SOLVED Qt: qt slots with parameters Signal and slot different
@koahnig said in Extremely stuck with passing two arguments to slot:. @davethedave. Hi and welcome to devnet forum. How many arguments has your signal? If a signal has only one argument, Qt cannot imagine what the second argument shall be.
Connecting signals and slots with different parameters: Is ... HI, I wish to make a connection, and I'm aware that they both must have the same type of parameter in order to work. My question is: Is there a way, or workaround, to this issue? In my project, I want to connect a simple valuechanged signal to a a slot th... Signals & Slots | Qt 4.8 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. Signals & Slots — Qt for Python 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. How to pass parameters to a SLOT function? | Qt Forum
HI, I wish to make a connection, and I'm aware that they both must have the same type of parameter in order to work. My question is: Is there a way, or workaround, to this issue? In my project, I want to connect a simple valuechanged signal to a a slot th...
and the signal (valueChanged) arguments was different from the slot (updateValue) arguments, this will make the compiler to try implicit conversion of the signal and slot arguments and you have one of 2 possibilities: 1. The compiler will try to make auto conversion (implicit conversion) and the conversion succeeded. 2. Connecting signals and slots with different parameters: Is ... HI, I wish to make a connection, and I'm aware that they both must have the same type of parameter in order to work. My question is: Is there a way, or workaround, to this issue? In my project, I want to connect a simple valuechanged signal to a a slot th... How to pass parameters to a SLOT function? | Qt Forum connect(buttonOne, SIGNAL(clicked()), this, SLOT(doSomething(double *))); @ This should work. But clicked() will not pass any data to your slot, so the pointer will be dangling. Plus you probably put the connect statement in a wrong place: it should be shown earlier, not on button click (but that depends on your design. Signals and Slots - Qt Documentation 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.
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. New Signal Slot Syntax - Qt Wiki The old method allows you to connect that slot to a signal that does not have arguments. But I cannot know with template code if a function has default arguments or not. So this feature is disabled. There was an implementation that falls back to the old method if there are more arguments in the slot than in the signal. qt - Passing an argument to a slot - Stack Overflow Maybe you can subclass QAction with an m_increase member variable. Connect the triggered() signal to a slot on your new QAction subclass and emit a new signal (e.g. triggered(int number)) with the correct parameter. Argument type for Qt signal and slot, does const reference ... Disclaimer: My qt is rather rusty, but the signal/slot mechanism is still just C++ function calls. If the signal/slot mechanism actually copies objects into internal storage, my apologies (you'll need to check the Qt pages, there's a big one on signals/slots afaik) - as the bits below will only be relevant in a C++ context, not in a C++ + Qt context.