Re: Gtk2::SimpleList

On Monday, May 31, 2004, at 02:24 AM, Daniel Kasak wrote:

> At least I know what I *can't* do ;)

there's nothing you can't do!  just depends on how sophisticated you 
make your code (and, possibly, how slow you're willing to let it run ;-)

> > (it is rather easy to get SimpleList to use custom renderers, by 
> > creating new column types.)
>
> So does that mean I can do all the validation *and* database 
> synchronisation in custom cell renderers, and then just drop the 
> renderers into a SimpleList?

i don't think you'd necessarily want to do database interaction in your 
cell renderer.  you're quite safe leaving that at the row level, 
managed by the list handling code.  the sort of validation i was 
talking about is making sure numbers are in the right range, that 
strings do not exceed a certain length, enums contain valid values, 
etc.  these are all things that you can set up on a per-column basis, 
often from the table description; you don't really need cell 
granularity for that.

if you set up a bunch of renderers that can validate the user's input 
at that low level, then you can be comfortable that when the 
row-changed signal fires, you have a decent set of data in the changed 
row that you can then update in the database.


> I will, however, have a look at TreeView / ListStore stuff. Maybe I 
> should learn that too?

even if you continue to use SimpleList, it will not hurt you at all to 
learn how TreeView and ListStore work together.  besides, if you want 
to use a tree, you have to use TreeView and TreeStore.  it's actually 
not hard, just takes a bit of messing about to figure out what 
everything does.  there's an excellent treeview tutorial linked from 
the gtk2-perl website's "links" page; it's written for C, but it's 
fairly easy to figure out the corresponding perl.

--
Holy crap, dude, we have kids!
        -- Elysse, six days after giving birth to twins