Qpushbutton do something until click other button

[isan]

I set timer in my pushbutton ,in start button start timer to send function every 3 second and stop button stop timer

connect(tm, SIGNAL(timeout()), this, SLOT(sninv());
        tm->start(3000);

connect(tm, SIGNAL(timeout()), this, SLOT(sninv());
        tm->start(3000);

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tnx..