Custom sortable columns in QFileSystemModel
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Thast's why https://doc.qt.io/qt-6/qfilesystemmodel.html#lastModified is there.
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@JonB said in Custom sortable columns in QFileSystemModel:
You are now talking about a "Date Modified" column inbuilt into QFileSystemModel, and not the "creation date" column you added for your birthTime()?
Yes. This column value is QString, not QDateTime. You may check sources: https://codebrowser.dev/qt5/qtbase/src/widgets/dialogs/qfilesystemmodel.cpp.html#808
@Jo-Jo
I now see that, and see from https://codebrowser.dev/qt5/qtbase/src/widgets/dialogs/qfilesystemmodel.cpp.html#737 that it is called in the implementation ofQFileSystemModel::data()for column #3, which is what I needed to know.I also see it is formatted as a string with
QLocale::ShortFormat. I don't know what that looks like, I don't know how "precise" it is (e.g. down to, say, milliseconds or likely not?), I don't know what the locale-aware formatting does with it. Putting all these together it would not surprise me if it is unsuitable for sorting, and/or for converting back (accurately) to a datetime/comparing. Whereas thebirthTime()you use for your extra column is indeed a datetime type and is suitable.Hence, as both I and @Christian-Ehrlicher have said, I would use
lastModified()just as you usebirthDate()for this column in your own code fordata()method.
