title: Qt Accidental activation of dragLeaveEvent，what should I do?
body: <p>I have a <code>QPushButton</code> on a <code>QScrollArea</code>, the parent of the <code>QPushButton</code> is the <code>QScrollArea</code>. I drag the object to the <code>QScrollArea</code> and then to the <code>QPushButton</code> which always activates the <code>dragLeaveEvent</code> of the <code>QScrollArea</code>, I don't want this function to activate, what should I do?</p>