Qt slot met slot verbinden

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Qt Signal Slot Thread. QWaitCondition synchronizes threads not by enforcing mutual exclusion but by providing a condition variable. While the other primitives make threads wait until a resource is unlocked, QWaitCondition makes threads wait until a particular condition has been met. To allow the waiting threads to proceed, call wakeOne() to

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This function was introduced in Qt 5.5. [static] void QThread:: msleep (unsigned long msecs) Forces the current thread to sleep for msecs milliseconds. Avoid using this function if you need to wait for a given condition to change. Instead, connect a slot to the signal that indicates the change or use an event handler (see QObject::event()).

Okay, so pretty much every tutorial/understandable-written-in-human-language-documentation is for PyQt4. But, PyQt5 changed how the whole 'connect button to a slot' works, and I still can't figure it out how to do it. I did a quick gui in QtDesigner, and I have a QPushButton and a label. Connecting the same slot to a signal multiple times actually makes multiple connections and therefore invokes the slot as many times as it was registered when the signal is emitted. Arguably only one connection to each slot should be allowed. As Dave Kilian answered, the signals and slots for QSlider don't use double. Also, Qt 4 does not automatically convert the types; it will not allow you to connect them. So, you will have to write your own conversion slot which updates the value of the other item.


The code inside the Worker's slot would then execute in a separate thread. However, you are free to connect the Worker's slots to any signal, from any object, in any thread. It is safe to connect signals and slots across different threads, thanks to a mechanism called queued connections .

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Slots are normal C++ functions and can be called normally; their only special feature is that signals can be connected to them. On the other hand, signals are generated by Qt (moc) and therefore are able to call connected slots: Signals are automatically generated by the moc and must not be implemented in the .cpp file. See full list on doc.qt.io In Qt Designer's signals and slots editing mode, you can connect objects in a form together using Qt's signals and slots mechanism.Both widgets and layouts can be connected via an intuitive connection interface, using the menu of compatible signals and slots provided by Qt Designer.

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There's no need to make it virtual (it already is per C++ semantics), and there's no need to make it a slot again (it already is per Qt semantics). It is incorrect to add the second connection in Derived , it'll simply result in the slot being activated twice per every activation of the signal. Did you checkout already signal-slot page? Basically you need pointers of both classes for use in connect statement. Since your slot. private slots: void SlotDisplayProgress(QString sActivity_i, int nProgressPercentage_i); you can only connect from a routine in MainWidnow (e.g. the ctor). So if you have in MainWindow something like: