Qt slots with return values

Old-style Signal and Slot Support — PyQt 4.9.4 Reference…

Slots - PUC-Rio QObject is the base class to most Qt classes. ..... A slot can return values, but not through connections. ○. Any number of signals can be connected to a slot. ○. Lambda Expressions and Qt 4.x - Silmor.de bool myComparison(const MyStruct&a,const MyStruct&b) { return a.member ... ()>l,QObject* parent = 0):m_ptr(l){} public slots: void call(){if(m_ptr) m_ptr();} }; ... are copied (the lambda knows its context by value instead of by reference), but that ... Package 'qtbase' methods and extending 'Qt' classes from R. Other packages build upon .... the values are double, a QSizeF instance is returned, otherwise an instance of .... These are typically signals and slots, although arbitrary methods/constructors are also ... Copied or Not Copied: Arguments in Signal-Slot Connections ...

Сигналы и слоты в Qt реализованы с механизмом надежности работы в потоках, а это означает, что вы можете высылать сигналы и получать, не заботясь о блокировке ресурсов. Вы можете перемещать объект, созданный в одном потоке, в другой.

One of the key features of Qt is its use of signals and slots to communicate ... that is the signature of the signal that would be returned by Qt's SIGNAL() macro. .... def valueChanged(self, value): """ Two slots will be defined in the QMetaObject. Debugging Qt's signal-slot connections… – Ray Rischpater, KF6GPE Feb 13, 2012 ... Debugging Qt's signal-slot connections… What do ... If need be, ensure that connect succeeds by testing its return value (it should return true .

Support for Signals and Slots — PyQt 5.11.1 Reference Guide

PyQt/Sending Python values with signals and slots - Python Wiki Sending Python values with signals and slots. On the #pyqt channel on Freenode, Khertan asked about sending Python values via Qt's signals and slots mechanism.. The following example uses the PyQt_PyObject value declaration with an old-style signal-slot connection, and again when the signal is emitted, to communicate a Python dictionary. Qt Remote Objects 5.12.3 Qt Remote Objects (QtRO) is an inter-process communication (IPC) module developed for Qt. The idea is to extend Qt's existing functionalities to enable an easy exchange of information between processes or computers. Passing extra arguments to PyQt slots - Eli Bendersky's website April 25, 2011 at 13:38 Tags Python, Qt A frequent question coming up when programming with PyQt is how to pass extra arguments to slots. After all, the signal-slot connection mechanism only specifies how to connect a signal to a slot - the signal's arguments are passed to the slot, but no additional (user-defined) arguments may be directly passed. Qt - A simple tree model | qt Tutorial

Return value from slot in differnet thread | Qt Forum

Qt 5 and C++11: Lambdas Are Your Friend | Custom Software ... Sep 12, 2013 ... Since Qt 5 was released I had been putting off upgrading to Qt 5 on a project I have ... SIGNAL and SLOT used in the connect method calls are macros that ... used in the body by value) connect(pushButton, &QPushButton::clicked, .... and performs functions such as recognizing you when you return to our ... 20 ways to debug Qt signals and slots | Sam Dutton's blog Oct 3, 2008 ... Check the return value of the connect statement: connect returns true if it successfully ... Follow Qt's naming conventions for signals and slots:. QML2 to C++ and back again, with signals and slots - andrew-jones ... Nov 23, 2014 ... Signals and Slots are a feature of Qt used for communication ... I will emit the signal when the button is pressed, passing the value of the text ...