Firsy of all, thanks for all your help.
But, there is a big problem if we use a flag or a scroll amount in a paintEvent(), we can not differentiate that it is call by we update(currentIndex()) or Qt Server sometimes.
one more question: Qt normally erases the widget's area before the paintEvent() call, now,
How can i disable Qt to erase the content? some times I don't want to clear the content when I call update(), like this task to scroll focus item text.
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