01.04.2017, 15:44, "william.croc...@analog.com" <william.croc...@analog.com>: > On 04/01/2017 03:41 AM, Dan Allen wrote: >> Hi, >> >> Could anyone tell me if it's possible to paint into a QPrintPreviewWidget in >> another thread, and if so, how? >> >> I have created a class to perform printing and this runs in another thread. >> When used for printing it works fine. However when used for the print >> preview, >> nothing is shown unless I force the signal to either Qt::DirectConnection >> (i.e. >> use the GUI thread) or Qt ::BlockingQueuedConnection (i.e. block the GUI >> thread). > > Dan: > > Conventional wisdom, if not the rule of law, states that all GUI activity > should be done from the main thread.
Except OpenGL rendering that may be done from other thread > You may just be experiencing > the Qt library enforcing this rule. > > Bill > >> Thanks, >> >> Dan Allen. >> >> _______________________________________________ >> Interest mailing list >> Interest@qt-project.org >> http://lists.qt-project.org/mailman/listinfo/interest > > _______________________________________________ > Interest mailing list > Interest@qt-project.org > http://lists.qt-project.org/mailman/listinfo/interest -- Regards, Konstantin _______________________________________________ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
