[SOLVED] Connecting signal and slot between parent and ... Hello, I have an application with a main widget (parentWidget). Within my main widget I create a new widget (we can call it childWidget). Within childWidget I create a new widget (call it grandchildWidget). I want to connect a signal from my grandchild to... Qt - Calling widget parent's slots - Stack Overflow Why are you trying to call the parent's slot? As it is already a slot, why don't you emit a signal from the child and connect this signal to the parent's slot? – erelender Apr 6 '10 at 13:15 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. They are completely type safe. qt - connecting signal/slot across different threads ...
If you have not explicitly connected any signals or slots, and the only events ... If your QObject is a GUI object you've passed given to Qt for it to delete all is good. ... integers will alias so that signals intended for the second slot in parent class B ...
Cannot connect signal and slot from different thread. | Qt ... @Wuzi said in Cannot connect signal and slot from different thread.. Qt::QueuedConnection will be made automatically when I create a connection between two threads or do I have to set it explizit? It is done automatically if you connect after moving to thread. Disconnect specific slot from all signals | Qt Forum Disconnect specific slot from all signals Disconnect specific slot from all signals ... If you deleted receiver (the parent class), then all of the signals/slots associated with that object will be deleted as well on cleanup...or delete the children classes...that's the only way I can think of doing it. ... Looks like your connection to Qt ... Signals and Slots - Qt Documentation 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.
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Qt – signály a sloty | IT blog
qt documentation: Connecting overloaded signals/slots. Example. While being better in many regards, the new connection syntax in Qt5 has one big weakness: Connecting overloaded signals and slots.
Signals and slots Connect | Qt Forum with signals and slots. It can be a bit of a challenge to have pointers to both objects in same place but often the mainwindow is a good place. Note that its also ok to connect signal to signal. This can be used to surface some signals from inside a class to outside world. Like if you have a dialog with an TextEdit.
New Signal Slot Syntax - Qt Wiki
Cannot connect signal and slot from different thread. | Qt ... After I created the socket, I try to connect QUdpSocket::readyRead with my own function readData() from another thread. When I initialize in the UDP constructor QObject with the default constructor with no arguments, the output result is, that the first connect works fine and I get data, the disconnect works fine, because I don't get anymore data, but the reconnect does not work anymore. connect signal from subclass to father's slot | Qt Forum Qt Development General and Desktop connect signal from subclass to father's slot connect signal from subclass to father's slot. This topic has been deleted. Only users with topic management privileges can see it. Josz. last edited by Josz . Hi, I have a method in MainWindow called debug. MainWindow contains an object called inputline and into inputLine, there is a QPushbutton called sendButton ... New Signal Slot Syntax - Qt Wiki Connecting in Qt 5. There are several ways to connect a signal in Qt 5. Old syntax. Qt 5 continues to support the old string-based syntax for connecting signals and slots defined in a QObject or any class that inherits from QObject (including QWidget) Signals & Slots | Qt Core 5.12.3
Connecting in Qt 5. There are several ways to connect a signal in Qt 5. Old syntax. Qt 5 continues to support the old string-based syntax for connecting signals and slots defined in a QObject or any class that inherits from QObject (including QWidget) . connect( sender, SIGNAL( valueChanged( QString, QString ) ), receiver, SLOT( updateValue( QString ) ) ); qt - How to connect a qml child component signal to a c++ ... I want to connect a child item component signal to a c++ slot but it is not working. I have one file ButtonItem.qml in which the code is like Item { id: button property string label Qt connect signal to slot - Stack Overflow connect(test_btn, SIGNAL(clicked()), SLOT(test_function())); The widgets and buttons appear as expected in the application but when I click it nothing happens. If I add the same connect code to the main window it works (for calling a test function from the main window) i.e. Signals and Slots - Qt Documentation 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.