[Blobs] Customizing display of Node/Edge values

[Malcolm Wallace]

Einar Karttunen <ekarttun at cs.helsinki.fi> writes:

> I am thinking of extending the InfoKind to support types with
> a finite amount of values that should be edited from a
> dedicated dialog box rather than a text edit control 
> (for edge and node values).
> 
> Does this make sense and what aproach do you think would
> be the most sensible for this kind of change?

The XTC (extended and typed controls) library might be useful here.
Some documentation is available at the Dazzle website:
    http://www.cs.uu.nl/dazzle/

If different information types should have different editing
interactions, one option is to add a new method to the InfoKind class,
indicating the appropriate interaction style.
e.g.  (based on the XTC styles)

    data InteractStyle
        = RadioView
        | SingleSelectionList
        | MulipleSelectionList
        | ChoiceView
        | ValueEntry

    class InfoKind a where
        ...
        interactStyle :: a -> InteractStyle

Incidentally, the version of XTC.hs currently distributed in Blobs
is older than the one on the Dazzle webpage, so it would be worth
updating that first.

Regards,
    Malcolm