signal/slot c++ example - How to connect a QML signal with a C++ slot? - qt istana slot 888

Connecting a QML signal to a regular C++ slot is easy: // QML Rectangle { signal foo(); } // C++ old-style QObject::connect(some_qml_container, SIGNAL(foo()), some_qobject, SLOT(fooSlot()); // works!

When a signal is emitted, and both signal and slot are in the same thread, emitting a signal directly executes the connected slot(s).

Your class must inherit from QObject (through QWidget for example) to be able to use the signal/slot mechanism. ... Linking the signals and slots require to know which object must be linked to which, and which function is linked to which signal.

Signals and slots can also be specified as C++ method signature strings passed through the SIGNAL() and/or SLOT() functions ...