[Development] Adding CPD support to Qt print dialog

[Gaurav Guleria]

Yes, CPDB is just a different backend for the existing print dialog GUI. 
It's merely a different way of enumerating printers and their features.

I have already prepared a simple CPDB plugin (still requires a few 
changes and additions) which can already respond to 
QPrinterInfo::availablePrinters() queries: 
https://github.com/TinyTrebuchet/qtbase/commits/cpdb.

On 9/26/22 21:30, Shawn Rutledge wrote:
>
>> On 2022 Sep 26, at 16:54, Volker Hilsheimer <volker.hilsheimer at qt.io> 
>> wrote:
>>
>> I think it will be easier to understand what abstraction we need once 
>> we have a patch to look at that implements CPDB support. That we 
>> don’t have a QPA-level abstraction for print dialogs in Qt shouldn’t 
>> block adding CPDB support.
>>
>> However, rather than throwing more #if’ery complexity into 
>> qprintdialog_unix.cpp it might be best to make a dedicated 
>> implementation of a CPDB-dialog.
>
> But it was already pointed out that the widget dialog is intended to 
> look exactly the same, right?  This is not a native dialog, it’s just 
> a different backend that the same old widget dialog should learn how 
> to deal with, AFAIU.  And qprintdialog_unix.cpp is really building up 
> the widget hierarchy for it.  It has a complex feature set.  We 
> haven’t been writing new widgets ourselves, and a few more #if’s will 
> be less to maintain than a whole new widget-based dialog would be.
>
> Refactoring into whatever plugins or QPA stuff is worth discussing, 
> but I guess it will be easier to visualize the refactoring after we’ve 
> got something that works.  And I haven’t dug into the implementation 
> enough to think about whether anything there is reusable in Qt Quick. 
>  QPrinterInfo is public, so I guess the first natural “model” for the 
> dialog is going to end up being the list returned from 
> QPrinterInfo::availablePrinters() anyway.
>
>
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