Adding random columns to Dolphin should be fairly easy. The hard part is
making it in a performant way. Most of the information you want to
display is stored in Nepomuk and by default read for each item
separately. This is of course a bad situation. One query for all
displayed items would work much snappier. This is something that we
could discuss in further detail though.
My recommendation: start by implementing it the slow way (maybe by using
a separate thread that populates the additional columns via
Nepomuk::Resource::property() one by one).
The only question then is: which columns to propose. You could of course
start with a hardcoded list and later we could think of some smart way
to get the possible metadata to show - maybe by checking all files'
mimetype or something...

Cheers,
Sebastian

On 07/13/2010 03:03 AM, Aaron Peterson wrote:
> Hiya,
> 
>  I am seeking a mentor to help me get into kde development.
> 
> I am very excited as I now have a 4.5 branch development environment
> partially set up, and I read a few C++ tutorials, followed a QT
> tutorial... and have been browsing websvn.
> 
> I would like to be able to add columns to dolphin's details view.
> 
> These files seem important:
> http://websvn.kde.org/branches/KDE/4.5/kdelibs/kfile/kdiroperatordetailview.cpp?view=markup
> 
> http://websvn.kde.org/branches/KDE/4.5/kdelibs/kfile/kdiroperatordetailview.cpp?view=markup
> approx line 662
> 
> 
> Specifically, I want to add image properties, like height and width,
> md5sum.  Also I would like to be able to make the selection indicator
> be in it's own column, rather than overlap the icon (however, hacking
> at the icon level would work better)
> 
> Basically, I would like to make it very easy to add columns to a
> detailsview. and I think the changes  would be in Kio, as a child of
> kdirmodel, but I would like to know more.
> 
> 
> --------------------------------------------
> more hopes
> ----------------------
>  [I would also like to make other ways to sort files, based on last4
> digits of filename and other things that I hacked into windows
> explorer to make my job easier] [ This would also be helpful for
> koffice, where items can be sorted by contents, author, and other
> properties]
> 
> Also  I would like experiment with  a toggle switch to change between
> selection and execution modes. (click a button to make it so KDE
> doesn't try to execute or open anything in a certain directory).
> 
> I also want to work with accessibility features.
>