Вопрос по Qt ( сигналы, слоты ) / Общее / Форум... Вопрос, система сигналов-слотов в Qt потокобезопасная? У меня в приложении грубо говоря есть два основных потока, каждый из них живет своей жизнью и не зависит друг от друга. Но иногда из одного потока мне нужно передать сообщение в другое, либо наоборот. Using Qt signals and slot machines when the same... -… Qt’s signal and slot mechanism works fine when you have events that occur in one component and need to be handled by one or more other components.It just seems awkward to me to have two signals that convey the same information but which have different names (and likewise for the slots). example connect to - Qt signals and slots: permissions
Signals and slots are used for communication between objects. 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. Introduction In GUI ...
With a few exceptions, the copies have the exact same Qt API as the original object, and are intended to be used exactly as if the original object were available. The QtWebKit Bridge | Qt 4.8 You just want to define how the script responds to a signal and leave it up to the C++ side of your application to establish the connection between the C++ signal and the JavaScript slot. SPL Module Reference: qt All Qt classes are available via the qt namespace and can be instanciated using the "new" keyword, like normal SPL objects: load "qt"; var a = new qt.QApplication(); var l = new qt.QLabel(undef); l.setText("Hello World!") a.setMainWidget(l … What do I do if a slot is not invoked? - KDAB All Qt developers have asked themselves at least once in their careers: “why isn’t my slot invoked?” (I’ve asked myself that question many, many times). There are a number of reasons why a connection may fail to be properly set up, and …
Signals and Slots - Vrije Universiteit Brussel
Support for Signals and Slots¶ One of the key features of Qt is its use of signals and slots to communicate between objects. Their use encourages the development of reusable components. A signal is emitted when something of potential interest happens. A slot is a Python callable. If a signal is connected to a slot then the slot is called when QML Signal and Handler Event System | Qt 4.8 When a signal is connected to a method, the method is automatically invoked whenever the signal is emitted. (In Qt terminology, the method is a slot that is connected to the signal; all methods defined in QML are created as Qt slots.) This enables a signal to be received by a method instead of a signal …
New-style Signal and Slot Support ... However, where a class has overloaded Qt signals (ie. with the same name but with different arguments) PyQt4 needs additional information in order to automatically connect the correct signal. For example the QtGui.QSpinBox class has the following signals:
Why I dislike Qt signals/slots - elfery Why I dislike Qt signals/slots (Originally posted on Sunday, February 19th, 2012.) I've created over a dozen small projects using Qt by now. Most of the time I think I might as well make use of Qt's signals/slots system -- I mean it's ... Signals and Slots | Introduction to GUI Programming with ... All the other buttons are created in the same way, differing only in their variable name and the text that is passed to them. We will start with the simplest connection, which is used by button1. Here is the __init__() method's ...
Getting the most of signal/slot connections : Viking Software…
Signals and Slots. 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 predefined signals, but we can always subclass widgets to add our own signals to them. A slot is a function that is called in response to a particular signal. Signals and Slots in Depth | C++ GUI Programming with Qt4 ... If the parameter types are incompatible, or if the signal or the slot doesn't exist, Qt will issue a warning at run-time if the application is built in debug mode. Similarly, Qt will give a warning if parameter names are included in the signal or slot signatures. So far, we have only used signals and slots with widgets. But the mechanism itself ... c++ - Qt Slots and C++11 lambda - Stack Overflow
Qt 4.8: Signals & Slots