Qt signal slot additional parameters
Just implement a QPushButton::clicked() slot that is connected to multiple push buttons. Inside that cast sender() to QPushButton* to access the button and identify it. You can then emit a user defined signal with additional parameters.
How Qt Signals and Slots Work - Part 2 - Qt5 New Syntax How Qt Signals and Slots Work - Part 2 - Qt5 New Syntax This is the sequel of my previous article explaining the implementation details of the signals and slots. In the Part 1 , we have seen the general principle and how it works with the old syntax. Signals and Slots | Introduction to GUI Programming with ... A slot may not have more arguments than the signal that is connected to it, but may have less; the additional parameters are then discarded. Corresponding signal and slot arguments must have the same types, so for example, we could not connect a QDial's valueChanged(int) signal to a QLineEdit's setText(QString) slot. A Qt way: Automatic Connections: using Qt signals and slots ...
Signals & Slots | Qt 4.8
qobject.cpp source code [qtbase/src/corelib/kernel/qobject.cpp ... 113, qWarning( "QObject::connect: Cannot queue arguments of type '%s'\n". 114, "(Make ..... 663, connect a signal to a slot with connect() and destroy the .... 781, From Qt 4.2, dynamic properties can be added to and removed from QObject. Prefer to use normalised signal/slot signatures | -Wmarc
No, it is not possible. You are only allowed to connect slots with less or equal argument count, than in corresponding signal. (see documentation). You have to create proxy slot, that will call desired one.
Qt Signal Slot Multithread, Protected, Public, or Private Signals. ... if a signal has more parameters than the slot it is connected to, the additional parameters are ... Signals and Slots — Flow Framework 5.3.x-dev documentation The concept of signals and slots has been introduced by the Qt toolkit and ... Whatever parameters are defined will be handed over to any slots listening to that ... Copied or Not Copied: Arguments in Signal-Slot Connections ... 29 Jun 2013 ... How does the behaviour differ for direct and queued signal-slot connections? ... The Qt documentation doesn't say a word about it. There is a ... 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.
Hi the other way around is easy, I mean you can send/Signal more arguments than you want to receive in your Slot (Qt happily throws the extra arguments away for you). But receiving more arguments than sending, then Qt has to grab something out of thin air, Qt is good but not that good.
Qt Fundamentals Qt Basics. Qt Basics ... Exceptionally if a signal has more parameters than the slot it is connected to, the additional parameters are ignored MochiKit.Signal - Simple universal event handling If the slot was a single function, then it is called with this set to the object originating the signal with whatever parameters it was signalled with. OneSignal Plugin | Felgo Documentation The following example defines an additional key named screen:
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