If multiple signals point to the same slot function, you want to know which signal is triggered.

Signal and slot And If multiple signals point to the same slot function
If multiple signals point to the same slot function , Want to know which signal is triggered .

contect(colorPushBtn, SIGNAL(clicked()), this, SLOT(doPushBtn()));
contect(errorPushBtn, SIGNAL(clicked()), this, SLOT(doPushBtn()));

// colorPushBtn and colorPushBtn Is a different button . Want to know which button ,

QPushButton *btn = qobject_cast<QPushButton*>(sender());
if (btn == colorPushBtn) {
	//  Color dialog 
}