Il giorno 01/nov/2011, alle ore 23:36, John Layt ha scritto: > On Monday 31 Oct 2011 09:37:18 Giovanni Bajo wrote: >> Hi John, >> >> thank you very much for accepting to be the printer maintainer. >> >> Last year, we (Develer) proposed a patch that was rejected: >> http://qt.gitorious.org/qt/qt/merge_requests/733 >> >> We then opened a bug to discuss an alternative API to implement the features >> we require: https://bugreports.qt.nokia.com//browse/QTBUG-12168 >> >> (the two links above summarize our needs quite well) >> >> If we could agree on the API at least, we could move on and submit a new >> patch. >> >> Thanks! > > Hi Giovanni, > > Thanks for bringing this to my notice. I have to confess that QPrintPreview > is something I haven't touched and so have little knowledge of and it is on > my > learning TODO list. I'll need to get up to speed there before I can comment > on the proposal properly, but it does feel somewhat awkward to me. > > The big hurdle is that we don't really want to make any changes to the > existing printing code in 5.0 other than the work done to split it into a > separate module. We want to leave any significant changes for the new module > in 5.1 or 5.2. That said, if the implementation is a single new method that > doesn't change much of the existing code and doesn't change the existing api > or its behaviour then I would consider it.
OK. More to the point, the QPrintPreview::drawPage() method I was thinking of is very simple: it would just draw the specified page's QPicture through the provided painter (so probably a one-liner). Currently, our modified Qt build uses the patch in the merge request (a method to get a copy of the internal QPictures) but since there were concerns with exposing those objects, we would still be set with just being able to draw them. > The bug report mentions 2 points, 1) to Aquire a separate preview for each > page and 2) the ability to print page subsets like 1,8,12. I can say now > that > 2) is not supported by Qt currently and will not be supported in > QPrintSupport > in 5.0 as it would require considerable changes to the existing code and api. > > It is a feature that will be in the new printing module though in 5.1/5.2 (in > fact, it was writing patches to do this that led to my becoming maintainer). > > Will fixing 1) still be useful to you without 2)? Yes, in my case fixing 1 is enough because I can emulate 2 through it (once I get the preview of each page as a "paintable", it's easy to draw the subset of pages your want onto a QPainter and call newPage() inbetween). Thanks! -- Giovanni Bajo :: [email protected] Develer S.r.l. :: http://www.develer.com My Blog: http://giovanni.bajo.it
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