As you might expect, there are some changes in how connections can be terminated in Qt 5, too. Old way. You can disconnect in the old way (using SIGNAL, SLOT) but only if You connected using the old way, or; If you want to disconnect all the slots from a given signal using wild card character; Symetric to the function pointer one Interacting with QML Objects from C++ | Qt QML 5.9 This means the QML engine can use the Qt Meta Object System to dynamically instantiate any QML object type and inspect the created objects. This is useful for creating QML objects from C++ code, whether to display a QML object that can be visually rendered, or to integrate non-visual QML object data into a C++ application. Support for Signals and Slots — PyQt 5.11 Reference Guide
How to Expose a Qt C++ Class with Signals and Slots to QML
Both QML and C++ are powerful and have many advantages. This guide shows how to enhance your C++ class with signals and slots for usage with QML. QtScript – WebKit Any QObject-derived class instance can be exported to JavaScript this way, without the C++ class author having to do anything special; just declare his properties (Q_Property) and slots in the class declaration. QSpinBox Class | Qt Widgets 5.12 The QString overload provides the value with both prefix() and suffix(). The current value can be fetched with value() and set with setValue().
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. e.g.
Qt: meaning of slot return value? ... It seems that's not the only way the return value can be ... Browse other questions tagged c++ qt signals-slots or ask your own ...
Model/View Programming | Qt Widgets 5.12.3
Both QML and C++ are powerful and have many advantages. This guide shows how to enhance your C++ class with signals and slots for usage with QML. QtScript – WebKit Any QObject-derived class instance can be exported to JavaScript this way, without the C++ class author having to do anything special; just declare his properties (Q_Property) and slots in the class declaration. QSpinBox Class | Qt Widgets 5.12 The QString overload provides the value with both prefix() and suffix(). The current value can be fetched with value() and set with setValue(). QMetaMethod Class | Qt Core 5.12.2 Because signals and slots can be dynamically invoked, you must enclose the arguments using the Q_ARG() and Q_Return_ARG() macros. Q_ARG() takes a type name and a const reference of that type; Q_Return_ARG() takes a type name and a non-const …
The return value is used when making syncrhonous calls across threads inside a Qt application (supported via invokeMethod and settingI think that the return value for a slot is only available when the function is called directly (when it is a normal C++ function) or when using invokeMethod.
Qt 4.3: Сигналы и слоты Слот - это функция, вызываемая в ответ на определенный сигнал.Обратите внимание на то, что другие библиотеки, определяющие переменные с именем signals или slots, могут вызвать предупреждения и ошибки при компиляции с приложением, созданным на основе Qt. Как работают сигналы и слоты в Qt (часть 1) / СоХабр Qt хорошо известен своим механизмом сигналов и слотов. Но как это работает? В этом посте мы исследуем внутренности QObject и QMetaObject и раскроем их работу за кадром.Вызов слота. Также возможно вызвать слот по его индексу, используя функцию qt_static_metacall
Как работают сигналы и слоты в Qt | Блог разработчиков… Qt отлично знаменит своим механизмом сигналов и слотов. Но как это работает? В этом посте мы исследуем внутренности QObject и QMetaObject и раскроем их работу за кадром.Вызов слота. Также допустимо вызвать слот по его индексу, применяя функцию qt_static_metacall Signals & Slots | Qt Core 5.7 The signals and slots mechanism is a central feature of Qt and probably the part that differs most from the features provided by other frameworks.Slots can be used for receiving signals, but they are also normal member functions. Just as an object does not know if anything receives its signals, a slot does... Qt 4.5: Signals and Slots