if(QMessageBox::question(this,tr("Leave game"),tr("Are you sure you want to leave this game?"),QMessageBox::Yes|QMessageBox::No,QMessageBox::No)!=QMessageBox::Yes)
if(QMessageBox::question(this,tr("Leave game"),tr("Are you sure you want to leave this game?"),QMessageBox::Yes|QMessageBox::No,QMessageBox::No)!=QMessageBox::Yes)