[Kde-pim] Q: virtual / unread email collections; flags; drop data

[Sebastian Kügler]

Hey PIMsters,

<summary>
- How do I create virtual folders based on a SPARQL query?
- How would a SPARQL query showing unread emails look like?
- Which are the canonical flags to be used for read and important?
- How is the drag+drop data in kmail's items structured?
</summary>


I've done some Lion Mail hacking during the past days, and am now at a point 
where things start working again -- in principle -- through the use of the 
EntityTreeModel. That seems to work quite well, cool. :) (Code is in 
playground/base/applets/lionmail.)

Now I need to touch new ground. I can show a collection, get change 
notifications and all that, but it's still just a normal collection. What I'd 
like (need), is:

- a collection showing unread emails in the inbox (easiest case)
- a collection showing unread emails from folder A, B, C (poweruser case)
- a collection showing emails marked as important

My guess would be that I need a suitable SPARQL query to setup the 'virtual 
collection', and a sortproxymodel to massage it into an ordered list I can 
work with. I know next to nothing about SPARQL (but some SQL), so if someone 
had an example I could modify, that would be most helpful. An example how I'd 
setup a virtual folder based on a SPARQL query would be very useful as well.


Something else I'm rather confused about are flags. The ones I find in my 
Akonadi-collected emails are "\SEEN", "\Seen", "important", "\FLAGGED". Which 
ones are the right ones to use? Or should I go hunt for Nepomuk tags of 
emails?


Then, drag & drop. What I'm doing right now is put a URL list into the drop 
data, but that doesn't seem to be accepted as valid drop data by KMail. What's 
the right way to go about this? I can sift through the kmail code base, but if 
anyone here knows off-hand, that would save me some time I'd rather spend at 
the swimming pool. :-)

Thanks for the hints (so far, and the coming up ones :)).

Cheers,
-- 
sebas

http://www.kde.org | http://vizZzion.org | GPG Key ID: 9119 0EF9
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