Qt signal slot get sender

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Signals & Slots | Qt 4.8

I can emit from this thread, but only if I connect the slot using Qt::DirectConnection. The upshot is that QObject::sender() in the SLOT will always return NULL. I wish to call deleteLater() for instance, but that can only be scheduled in a QThread. I think I need to get back to the main thread, but how can I signal the object on the main thread? New Signal Slot Syntax - Qt Wiki Connecting in Qt 5. There are several ways to connect a signal in Qt 5. Old syntax. Qt 5 continues to support the old string-based syntax for connecting signals and slots defined in a QObject or any class that inherits from QObject (including QWidget) . connect( sender, SIGNAL( valueChanged( QString, QString ) ), receiver, SLOT( updateValue( QString ) ) ); Signals & Slots | Qt 4.8 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. Mapping Many Signals to One - Qt Documentation Qt allows us to connect multiple signals to the same signal or slot. This can be useful when we provide the user with many ways of performing the same operation. Sometimes, however, we would like the slot to behave slightly differently depending on which widget invoked it.

How to get calling button from a clicked event. ... Connect each button's click() signal with one and the same slot and use QObject * QObject::sender const [protected] in this slot to find out which button sent the signal ... Browse other questions tagged qt signals-slots pyside multiplexing or ask your own question. asked. 8 years, 2 months ...

[SOLVED]How to get emitter of a signal in the slot? | Qt Forum Hi, Currently I have five QListEdit widgets in a widget of my program. I need to connect their editingFinished() signal to a shared slot, but they have to be distinguished inside the slot. I guess it's impossible to get emitter of a signal in Qt, but writ... qt - Sender in signal-to-signal connection - Stack Overflow It's almost a function call. It is however setting the ::sender() pointers at (perhaps) each level of signal indirection - in the simple SIGNAL-SLOT connection, the SLOT can detect which object caused the signal that invoked the SLOT. This can be easily used to do custom multiple callers - slot invocations.

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

Сигналы и слоты в Qt / Хабр Механизм сигналов и слотов главная особенность Qt и вероятно та часть, которая отличаетcя от особенностей, предоставляемых другими фреймворками.В Qt используется другая техника — сигналы и слоты. Сигнал вырабатывается когда происходит определенное событие. QT: работаем с сигналами и слотами QT: работаем с сигналами и слотами. Этот "классический" слегка доработанный пример на сигналы и слоты в QT показывает, как их соединять, как разрывать иsender — указатель на объект, отправляющий сигнал; signal — это сигнал, с которым осуществляется соединение. How to get sender widget with a signal/slot mechanism? -… It's possible to bind more than one signal to one slot (isn't?). So, is there a way to understand which widget sends the signal? I'm looking for something like sender argument ofUse QObject::sender() in the slot, like in the following Example: void MainWindow::someSetupFunction( void ) {. Qt/C++ - Урок 024. Сигналы и слоты в Qt5

Suppose trials frontier slot machine rewards we have the qt cross thread signal slot following simple class:. – Adam W Jan 18 '10 at 17:59 @e8johan "make sure that yourUse moveToThread The key to getting slots to execute in a worker thread is to use the moveToThread method as Aiua pointed out.

c++ - Qt: Signal main thread - Stack Overflow