I use the QTIMER ,QTIMEEDIT,QTIME to show the time passed away.Here is the processment:When clicked the button.the QTIME timer_seconds minus one second and the QTIMEEDIT part show the time passed away.But if I clicked the button too fast.The timer_seconds would minus more than one second ,it might be minus two or three seconds which in fact that it only passed one second.The reason which i thought is I active the QTIMER function more than one times at a short time.So how to control the qtimer class to make sure the qtimer being actived at only one time.Do i need to use the QTHREAD and QMUAX some classes like that?And how?