[Interest] QPrintPreviewWidget

william.crocker at analog.com william.crocker at analog.com
Sat Apr 1 14:43:37 CEST 2017

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).

Conventional wisdom, if not the rule of law, states that all GUI activity
should be done from the main thread. You may just be experiencing
the Qt library enforcing this rule.


> Thanks,
> Dan Allen.
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