[Development] Adding CPD support to Qt print dialog

[G G]

I have added CPDB support to the print dialog, and opened a pull request
here: https://codereview.qt-project.org/c/qt/qtbase/+/437301. It would be
great if anyone is able to review it.

To build qt with CPDB support, make sure you have CPDB frontend library:
https://github.com/openprinting/cpdb-libs and CPDB CUPS backend:
https://github.com/openprinting/cpdb-backend-cups installed. Their debian
packages are outdated, since I had to make some one time changes and
improvements to CPDB while adding support to the GTK and Qt print dialog.
Once you have both of them installed, the "configure" command should
automatically pick up on the CPDB backend and prefer it over the CUPS
backend.

For now, I have used "#if QT_CONFIG(cpdb) ... #endif"  constructs in the
UNIX print backend, and also added a CPDB Job widget, which shares the same
UI as CUPS Job widget but different implementation.

Thanks,
Gaurav


On Fri, Sep 16, 2022 at 3:50 AM Gaurav Guleria <gaurav.gen3 at gmail.com>
wrote:

> Hello all,
>
> I am Gaurav Guleria, a GSoC student, working with Till Kamppeter to add
> and improve Common Print Dialog (CPD) support to existing print dialogs
> like GTK and Qt. More about CPD can be read here:
> https://openprinting.github.io/projects/04-print-dialog/.
>
> I wanted to ask about your opinions on the implementation and the way we
> should proceed with it. I talked with a few people and read this old
> article here: https://wiki.qt.io/Qt-5-QtPrint, which suggests the Qt
> team prefers CPD support as a plugin rather than a direct integration
> into the QPrintDialog.
>
> Just to summarize briefly, implementing CPD support directly in the
> print dialog would mean that the Qt team wouldn't have to worry about
> any future CUPS changes, or any other print backends for that matter, as
> CPD will handle them all instead.
>
> It would be really helpful if you could share your views on this and
> give your suggestions.
>
> Thanks,
>
> Gaurav
>
>
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