[Gtk-sharp-list] What's the best way to display fractions in a TreeView

[Matjaž Mihelič]

On Fri, 2009-07-24 at 15:19 -0700, Slug wrote:
> I'm really having a lot of trouble figuring out how I should go about
> displaying a bunch of numeric values as fractions in a TreeView.  If I
> convert them to strings and load them into the model, then the sorting is
> all out of order when I click on the column header.  It looks like this
> (which is wrong):
>      1    1/4
>      11  1/2
>      2    3/4
> 

use double or decimal as store value, use CellRendererText and then use
cell function
  TreeViewColumn.SetCellDataFunc(CellRenderer,TreeCellDataFunc) 
to calculate Text value;)

> Is there a delegate I can invoke in the TreeStore or on CellRendererText
> where I can stick the code that converts the raw numeric values in the model
> to the formatted strings that get displayed in the end?   Or, do I have to
> create a subclass 
> ( e.g. CellRendererFractionText : CellRendererText )  and then override the
> Render method.  This seems like a huge hassle for something so common -
> especially because there are no simple examples on how to do this for just a
> simple little bit of read only text.   
> 
> I must be totally missing something big and obvious  - what is it ? 
> 
> thx - Slugs
>