[Development] QtQuick Dialogs Widgets fallback

[EXT Mitch Curtis]

> -----Original Message-----
> From: Development <development-bounces at qt-project.org> On Behalf Of
> Kai Uwe Broulik
> Sent: Wednesday, August 23, 2023 4:17 AM
> To: development at qt-project.org
> Subject: [Development] QtQuick Dialogs Widgets fallback
> 
> Hi everyone,

Hi Kai,
 
> we found that the Qt Quick Dialogs (MessageDialog and friends) do not
> support a fallback to their widget counterpart like the ones from
> Qt.labs.platform did.
> 
> In KDE Plasma we do not provide a platform theme implementation for the
> message or color dialogs, as the Qt ones are “good enough”, thus we will get
> the QtQuick fallback which are a bit rough for use in a desktop application.

Which style are you referring to here? If there's a way we can improve our desktop-based fallbacks, it would be good to know about that.

> I understand and fully agree that the Qt Quick Dialogs module shouldn’t link
> QtWidgets, but is there a way we could support a fallback to QMessageBox,
> QColorDialog, etc, as the labs module did?

Assuming that we could make it entirely optional (also for e.g. static builds), I wouldn't be against it, but I'd still prefer to know what could be improved with our (desktop style) Qt Quick fallbacks.

> I found [1] which restructures the relevant styles into their own respective
> plug-in. Is it possible we add a QtQuick.Dialogs.Widgets import that then
> delegates to the relevant widgets, if there’s no platform-provided dialog? I
> don’t want to go down the rabbit hole of adding entire proper QFactory* for
> what is effectively a single conspicuous plug-in, so I wonder if we could
> piggyback on that infrastructure.
> 
> Cheers
> Kai Uwe
> 
> [1] https://codereview.qt-project.org/c/qt/qtdeclarative/+/476748
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