[Development] Adding CPD support to Qt print dialog

[JiDe Zhang]

Whether or not CPD should be implementation in Qt, we can first add some QPA abstraction for Print Dialog like as File Dialog. If the implementation of XDG portal in desktop environment is supported CPD, and Qt supported org.freedesktop.portal.Print, then we can use CPD in Qt applications.

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From: Development <development-bounces at qt-project.org> on behalf of Ilya Fedin <fedin-ilja2010 at ya.ru>
Sent: Friday, September 16, 2022 14:56
To: development at qt-project.org <development at qt-project.org>
Subject: Re: [Development] Adding CPD support to Qt print dialog

On Fri, 16 Sep 2022 06:32:38 +0000
Shawn Rutledge <Shawn.Rutledge at qt.io> wrote:

> Another aspect that I haven’t kept up with very well is how
> containerized applications should do printing.  We have “portal”
> support for file dialogs, for example, but is CPDB intended to work
> the same way regardless whether the app has such security
> restrictions or not?  For that matter, as a design principle, is
> everyone still sure that the way for an application to reach outside
> its container is D-Bus interfaces that are designed to be trusted?
> https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Fblogs.gnome.org%2Fmclasen%2F2018%2F07%2F19%2Fflatpak-a-look-behind-the-portal%2F&data=05%7C01%7C%7Ca0b26386402a4cc52feb08da97b0e52d%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637989083255289842%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=Bv3C78qNStklLcgcdZQ5UGMG3wJHRYKLxJ9xJ13cmmo%3D&reserved=0

There's Print portal for that purpose:
https://nam12.safelinks.protection.outlook.com/?url=https%3A%2F%2Fflatpak.github.io%2Fxdg-desktop-portal%2F%23gdbus-org.freedesktop.portal.Print&data=05%7C01%7C%7Ca0b26386402a4cc52feb08da97b0e52d%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637989083255289842%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=hcj6nnNUiO0Nlg17slHmpO4FcD0CWB%2FMUJR1%2BNlx5qk%3D&reserved=0

What good about it is it shows native file dialogs provided by the
environment that comes as a portal backend daemon. Just like the
FileDialog portal, it doesn't matter for the portal whether the
application is actually sandboxed, so it could be used even in
non-sandboxed environment.
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