[Kde-pim] Dragging akonadi items

[Ingo Klöcker]

On Sunday 21 February 2010, Robin Atwood wrote:
> If I drag a kaddressbook item to kwrite, the akonadi: URL is resolved
> and I can see the VCS entry in the editor. If I drag it to my
> KLineEdit widget I just get the URL despite that I have the
> UrlDropsEnabled property set. What am I missing? (A lot, I suspect!)

I think you misunderstand the UrlDropsEnabled property. The API 
documentation [1] says:
=====
void KLineEdit::setUrlDropsEnabled( bool enable )

Enables/Disables handling of URL drops.

If enabled and the user drops an URL, the decoded URL will be inserted. 
Otherwise the default behavior of QLineEdit is used, which inserts the 
encoded URL.
=====

So, URLs will not be resolved, but just decoded, i.e. %-encoded 
characters will be converted to the corresponding Unicode character.

IMO resolving of URLs cannot be handled by a plain vanilla KLineEdit 
because what the URL should be resolved to depends on the context. An 
akonadi-URL representing a contact could be resolved to the contact's 
name, the contact's email address, the contact's phone number, etc., 
depending on the context (i.e. does the line edit expect a name, an 
email address, a phone number, etc.).

The line edit used in KMail's composer for the email addresses is a 
subclass of KLineEdit which (among other features like address book 
completion) provides special handling of mailto:-URLs and akonadi:-URLs.

IMO a better approach than subclassing (which IMNSHO is almost always 
the wrong approach) would be making KLineEdit extensible with URL 
resolvers. Then the user of KLineEdit could add the correct resolvers 
depending on the context.


Regards,
Ingo

[1] http://api.kde.org/4.x-api/kdelibs-
apidocs/kdeui/html/classKLineEdit.html#aaa093c035a4cb233bb99da6cf78ac48f
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