Qt slots with return values

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.

Returns an object representing a built-in Qt slot QCheckBox::setIconSize. Return value of this function can be used for creating Qt connections using qt_core ... Qt - A simple tree model | qt Tutorial qt documentation: A simple tree model ... Example. QModelIndex does not actually know about it's parent/child indexes, it only contains a row, a column and a pointer ... Signals and Slots | Introduction to GUI Programming with ... Signals and Slots. Every GUI library ... (makers of Qt) have called "signals and slots". ... If the values are the same, we do nothing and return; otherwise, ...

What do I do if a slot is not invoked? - KDAB

VTK: vtkEventQtSlotConnect Class Reference ... Class Reference. Manage connections between VTK events and Qt slots. ... Return 1 if this class is the same type of (or a subclass of) the named class. More. Coding Guidelines - Mumble Wiki Oct 11, 2015 ... 4.1.1 Member functions; 4.1.2 Qt Slots; 4.1.3 Member variables ... Getters should be prefixed with get/is/has, be constant and name the variable they return ... If the enumeration values need explanation use multiple lines.

Boost.Signals позволяет различные стратегии используя возвращаемые значения слотов для формирования возвращаемого значения сигнала. Например. добавляя их, формируя из них vector или возвращая последний. Общая мудрость (выраженная в документации Qt...

Old-style Signal and Slot Support — PyQt 4.9.4 Reference… The returned value is normally passed to the QtCore.QObject.connect() method. PyQt allows any Python callable to be used as a slot, not just Qt slots. This is done by simply referencing the callable. Because Qt slots are implemented as class methods they are also available as Python callables. Qt 4.1: Signals and Slots

Return value from slot in differnet thread | Qt Forum

c++ - Qt: meaning of slot return value? - Stack Overflow This is passed by QMetaObject::invokeMethod. So the return value in the moc generated code is saved and passed back to the caller. So for normal signal-slot interactions the return value is not used for anything at all. However, the mechanism exists so that return values from slots can be accessed if the slot is called via invokeMethod. Slot return value - what if it would be not lost? | Qt Forum

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Qt ::ItemFlags StringListModel ::flags( const QModelIndex &index) const { if ( !index .isValid()) return Qt ::ItemIsEnabled; return QAbstractItemModel ::flags(index) | Qt ::ItemIsEditable; }

QAbstractItemModel Class | Qt Core 5.12.3 [virtual] bool QAbstractItemModel:: setHeaderData( int section, Qt::Orientation orientation, const QVariant & value, int role = Qt::EditRole) QPushButton Class | Qt Widgets 5.12.2 In Qt, the QAbstractButton base class provides most of the modes and other API, and QPushButton provides GUI logic. See QAbstractButton for more information about the API.