Am 08.09.2013 um 21:11 schrieb Alexander Syvak <alexander....@gmail.com>:
> Thank you, captain.
> But I am interested when the repaint is needed in Qt.
No, you were asking when the paint event is *sent* (see your own subject!) and
not when it is *needed* which are two different things!
I already told you when the event is "sent": when Qt thinks there is "a good
time to do so"!
For instance you can call QWidget several times in a row, combined with the
Window Manager also telling Qt to update (specific region of) a window ("system
events") - and you could still get just *one* paint event: the Qt event queue
decides itself *when* to sent the paint event.
My previous answer was deliberately a bit sloppy for at least three reasons:
a) to match with your sloppy question style ("short, undpecific, question only
in the subject, without motivation why you need to know etc.
b) it's actually a RTFM question, e.g. start here:
http://qt-project.org/doc/qt-4.8/qt4-arthur.html
c) But most importantly once you start asking - as an application developer -
about the "whens" of certain events then you're mostly up to something *wrong*
(or you already do something wrong and wonder about poor performance, e.g.
blocking/delaying the Qt event queue in the GUI thread): the "paint" API is a
contract between you and Qt: Qt promises to take care about the paint *events*
(but again: *when* or *why* exactly your application receives them is none of
your business!), your application promises to do the actual work ("paint").
If on the other hand you are *really* interested about the *interna* of Qt then
you are probably better off on the qt developer mailing list.
So long, sailor!
Captain Oliver_______________________________________________
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