[Interest] QWidget + friends; How to restore properties across sessions?

Mark Gaiser markg85 at gmail.com
Sat Aug 16 20:12:17 CEST 2014

On Sat, Aug 16, 2014 at 10:37 AM, Christoph Feck <christoph at maxiom.de> wrote:
> On Friday 15 August 2014 21:48:08 Mark Gaiser wrote:
>> Now i'm searching for alternatives to this approach to prevent
>> handling the bookkeeping myself and still have the same result. For
>> instance, would it be possible to have some function (in QObject or
>> QWidget i guess) where you either:
>> - Define which properties should be saved/restored across sessions,
>> bookkeeping would be done internaly.
>> - or just some "QObject::persistentSettings(bool)" function that -
>> when true - saves any properties and restores them upon next
>> request in a persistent manner.
> Each QMetaObject has a userProperty() which identifies the value that
> the user can change in the object. To get a key for the settings file,
> you can use special objectName()s. For example, in Smaragd, I prefix
> any object that should have a persistent user property with "cm_" (for
> config manager). See code at [1].
> In Skulpture, there are two older versions of this file, one of them
> uses QSettings[2] instead of KConfigGroup[3]. Those additionally
> handle oddities with combo boxes, but they do not use userProperty().

Hi Christoph,

That is roughly the solution i'm looking for.
But i'd like to go one step further. Do you know of some way - without
editing the Qt source itself - to automatically pass each QWidget the
gets constructed through the ConfigManager class? That would remove
the need to add each GUI "manually" (in your case the Config UI main
widget) in the ConfigManager.

> [1]
> https://projects.kde.org/projects/playground/artwork/smaragd/repository/revisions/master/entry/src/config/configmanager.h
> [2]
> http://quickgit.kde.org/?p=scratch%2Fcfeck%2Fskulpture.git&a=blob&h=43b6b8a73c34c54befe3a8289908e6a8d6344077&hb=431fdd98819adc8ac1890c01312b81f08f68562f&f=src%2Fconfig%2Fconfigmanager.h
> [3]
> http://quickgit.kde.org/?p=scratch%2Fcfeck%2Fskulpture.git&a=blob&h=c9816cacd6bec235e776e314c9ea5400d2fb44be&hb=431fdd98819adc8ac1890c01312b81f08f68562f&f=kwin-client%2Fconfig%2Fconfigmanager.h
> --
> Christoph Feck
> http://kdepepo.wordpress.com/
> KDE Quality Team

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