On Monday, January 16, 2012 13:21:19 you wrote: > On Monday 16 January 2012 02:13:44 Stephen Kelly wrote: > [...] > > > If QML doesn't re-read the rolenames when the model is reset, then > > there's a patch to be made in QtDeclarative. (QAbstractProxyModel > > doesn't re-read them on reset either. Ogoffart rejected my patch to > > make it do that for reasons which never made sense to me and which I > > now forget and can't find on the internet). > > I don't recall all the details either, but if I remember correctly, your > patch was doing things that were not allowed. > The role name feature is a bit broken as you can't really modify them. (As > usual with features that are added to Qt in a rush by the decarative team > for their own use cases, without much thinking ahead) > > The documentation say: > "This function allows mapping of role identifiers to role property names in > Declarative UI. This function must be called before the model is used. > Modifying the role names after the model has been set may result in > undefined behaviour." > > And you were calling it while the model was already in use, and I think it > was the reason why I rejected.
Yes, I think that was it. Bad documentation IMO. Resetting the model means you have to read everything from it from scratch. It is very much well enough defined IMO that resetting the model might mean that it has different role names. > > > Anyway the Qt 5.0 way to set rolenames is to implement a virtual method. > > Please see if that addresses your concern, and if it doesn't, then > > please > > write an example which doesn't require a proxy which hides 'multiple > > underlying models'. That might not work anyway for various reasons (if > > you are using QAbstractProxyModel). Use an example such as 'a proxy > > model which returns a string filename for an image instead of a QImage > > for the decoration role'. > > I think Qt 5 still do not implement ways to notify that the role name > change. Resetting the model means 'everything just changed'. The rolenames are part of 'everything'. I think all it takes is fixing the documentation for Qt 5 to make that clearer for you. Thanks, -- Stephen Kelly <stephen.ke...@kdab.com> | Software Engineer KDAB (Deutschland) GmbH & Co.KG, a KDAB Group Company www.kdab.com || Germany +49-30-521325470 || Sweden (HQ) +46-563-540090 KDAB - Qt Experts - Platform-Independent Software Solutions
signature.asc
Description: This is a digitally signed message part.
_______________________________________________ Development mailing list Development@qt-project.org http://lists.qt-project.org/mailman/listinfo/development
