PythonQt: PythonQtSlotInfo Class Reference returns if the slot is a constructor slot More... QObject * decorator const QString fullSignature (bool skipReturnValue=false, int optionalArgsIndex=-1) const get the full signature including return type More... QByteArray signature const get the Qt signature of the slot More... QByteArray slotName (bool removeDecorators=false) const How Qt Signals and Slots Work - Part 2 - Qt5 New Syntax In the function FunctionPointer::call, the args[0] is meant to receive the return value of the slot. If the signal returns a value, it is a pointer to an object of the return type of the signal, else, it is 0. If the slot returns a value, we need to copy it in arg[0]. If it returns void, we do nothing. How Qt Signals and Slots Work - Woboq Qt is well known for its signals and slots mechanism. But how does it work? In this blog post, we will explore the internals of QObject and QMetaObject and discover how signals and slot work under the hood. In this blog article, I show portions of Qt5 code, sometimes edited for formatting and brevity. How to Bind a QML Property to a C++ Function - Qt Wiki
Как использовать сигналы-слоты? В общем не могу понять как сделать. Было бы неплохо, если бы Вы показали на этом примере какВот что получилось: Теперь нужно сам алгоритм писать. Но как слоты-сигналы реализовать? Я понял, что через connect, но как не доходит.
c++ - QT return value from a signal? - Stack Overflow I'm running all my SQLite database operations in a separate thread to ensure that the GUI wont freeze up. I'm doing this by connecting up signals and slots for the methods. However now I need to ... How to pass parameters to a SLOT function? | Qt Forum connect(buttonOne, SIGNAL(clicked()), this, SLOT(doSomething(double *))); @ This should work. But clicked() will not pass any data to your slot, so the pointer will be dangling. Plus you probably put the connect statement in a wrong place: it should be shown earlier, not on button click (but that depends on your design. QMetaMethod Class | Qt 4.8 The return value of this method call is placed in returnValue. If the invocation is asynchronous, the return value cannot be evaluated. You can pass up to ten arguments (val0, val1, val2, val3, val4, val5, val6, val7, val8, and val9) to this method call. QGenericArgument and QGenericReturnArgument are internal helper classes.
Slot with return value called via Signal between differen Threads | …
Signals and Slots - Qt Documentation An abstract view of some signals and slots connections In Qt we have an alternative to the callback technique. We use signals and slots. A signal is emitted when a particular event occurs. Qt's widgets have many pre-defined signals, but we can always subclass to add our own. A slot is a function that is called in reponse to a particular signal. Qt: meaning of slot return value? - Stack Overflow I 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 ... How C++ lambda expressions can improve your Qt code - Medium
От переводчика: это вторая часть перевода статьи Olivier Goffart о внутренней архитектуре сигналов и слотов в Qt 5, перевод первой части тут. Новый синтаксис в Qt5 Новый синтаксис выглядит...
QIODevice Class | Qt Core 5.12.2 Qt and respective logos are trademarks of The Qt Company Ltd. in Finland and/or other countries worldwide. All other trademarks are property of their respective owners. QAbstractItemView Class | Qt Widgets 5.12 The model's implementation of flags() should do that by not returning Qt::ItemIsDropEnabled. QWindow Class | Qt GUI 5.12.3 On windowing systems that do not make this information visible to the application, isExposed() will simply return the same value as isVisible(). QSettings Class | Qt Core 5.12.2
Qt Signals And Slots - Programming Examples
Calculator Example | Qt Widgets 5.12.3 The private createButton() function is used as part of the widget construction. abortOperation() is called whenever a division by zero occurs or when a square root operation is applied to a negative number. QAbstractItemModel Class | Qt Core 5.12.3 [virtual] bool QAbstractItemModel:: setHeaderData( int section, Qt::Orientation orientation, const QVariant & value, int role = Qt::EditRole) The QtWebKit Bridge | Qt 4.8
QTextBrowser Class | Qt Widgets 5.12.3