20 ways to debug Qt signals and slots | Sam Dutton's blog Oct 3, 2008 ... Check that classes using signals and slots inherit QObject or a QObject subclass. ... Make sure to run qmake after adding the Q_OBJECT macro to a class. ..... Another option might be turning on Qt's logging, but I've never tried ... Qt MOOC | Part 2 - GitHub Pages Like other meta-data, class information is accessible at run-time through the meta-object; see ... Signals and slots are the key of Qt and object communication within. They are in a sense ... How to Use the Signal/Slot Communication Mechanism? | ROOT a ...
Access UI elements from another class | Qt Forum
Typically, to get the dialog to close and return the appropriate value, we connect a default button, e.g. OK, to the accept() slot and a Cancel button to the reject() slot. Alternatively you can call the done() slot with Accepted or Rejected. An alternative is to call setModal(true) or setWindowModality(), then show(). QTimer Class | Qt Core 5.12.3 The QTimer class provides repetitive and single-shot timers. The QTimer class provides a high-level programming interface for timers. To use it, create a QTimer, connect its timeout() signal to the appropriate slots, and call start(). From then on, it will emit the timeout() signal at constant intervals. QThread Class | Qt Core 5.12.3 The QThread class provides a platform-independent way to manage threads. A QThread object manages one thread of control within the program. QThreads begin executing in run(). By default, run() starts the event loop by calling exec() and runs a Qt event loop inside the thread. QWindow Class | Qt GUI 5.12.3
Subclassing QWidget | C++ GUI Programming with Qt4: Creating ...
Remember old X-Window call-back system? Generally it isn't type safe and flexible. There are many problems with them. Qt offer new event-handling system - signal-slot connections. Imagine alarm clock. When alarm is ringing, signal is sending (emitting). And you're handling it as a slot. Every QObject class may have as many signals of slots as ...
Signals and slots are loosely coupled: A class which emits a signal neither knows .... If on the other hand you want to call two different error functions when the ...
qt-signal-tools is a collection of utility classes related to signal and slots in Qt. It includes: ... QtMetacallAdapter - Low-level interface for calling a function using a list of ... other than those from the signal using QtCallback::bind() or std::tr1::bind() .
c++ - Qt signals and slots in different classes - Stack Overflow
[quote author="p3c0" date="1403361027"]bq. change the existing one. Do you mean you want to add this widget ?[/quote] Yes - add to the existing widget, glavni.cpp is a widget with a graphicsview and some other stuff in it and nasascena.cpp is basically qgraphicsscene which is …
Pointer to another class' slot | Qt Forum I'm currently trying to use Object::connect to call a slot that is defined in another class. The call is as follows: connect(ui->pbMenu, SIGNAL(clicked()), this, SLOT(master->changeForm(menu))); I'm doing it like this as I have several forms that I need to change between, and I don't to redefine the slot in every class/form when I could use a Qt c++ GUI call from another class - Stack Overflow Qt c++ GUI call from another class. Usually, Signals call slots, so add the updateUI signal as a signal to the myServer header and the slot function AppendToBrowser to the MainWindow header under private slots and implementation in its cpp. – TheDarkKnight Jul 3 '13 at 15:05. Access UI elements from another class | Qt Forum Hello, I am trying to figure out how to use UI elements in another class... Spent hours and did not find solution... Headers mainwindow.h controls.h Sources mainwindow.cpp controls.cpp main.cpp Forms mainwindow.ui I would like to add all functions of cont... Qt - Calling one form from another form - Experts Exchange