signal & slot

[Ashkan_s]

Is there a way to stop execution of a slot/function when a signal is emitted?

[Zlatomir]

You have to tell more information about what are you trying to do, so generic answer is you can disconnect the signal-slot connection or use return/exceptions if the condition to "stop" the slot execution is true.

[Ashkan_s]

I needed to check for a condition in a loop, the condition was a change in the range of a QScrollBar. So I wrote something like this pseudo-code:

int max = QScrollBar::maximum();
 
while (max == QScrollBar::maximum())
{
    do something;
}

int max = QScrollBar::maximum();

while (max == QScrollBar::maximum())
{
    do something;
}

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Then it crossed my mind to use QAbstractSlider::rangeChanged signal to control the execution of the loop if it is possible. This signal reports what I am looking for.

By stopping execution of a slot/function I mean exiting from it in the middle of execution of the slot/function.