Re: Editable toggle when multiple model cols in view col

[Edd Dawson <edd nunswithguns net>]

Hi again Murray,

Sorry to be such a nuisance... :)
Thanks for your help so far.

Murray Cumming wrote:
> > Murray Cumming wrote:
> > > On Sun, 2006-09-17 at 02:41 +0100, Edd Dawson wrote:
> > > [snip]
> > > > The book
> > > > (http://www.gtkmm.org/docs/gtkmm-2.4/docs/tutorial/html/ch08s02.html)
> > > > says:
> > > >
> > > > "You must set the cell's editable property to true, like so:
> > > >
> > > > cell.property_editable() = true;"
> > [ 8< --- snip ]
> >
> > > I think you need to use the "activatable" property.
> > That's what I suspected but I thought the last line of my code was editing
> > the
> > activatable property suitably? I tried replacing it with:
> >
> > rend->property_activatable() = true;
> >
> > This made no noticeable difference.
> >
> > One behavior that I have noticed is that if I leave the activatable
> > property
> > alone, the check-box is 'greyed-out'. So is activatable really the same as
> > editable? It's certainly doing something, but not what I want.
>
> Maybe you are not setting the new value in the model when the check box is
> clicked. You need to not only set the cell to editable/activatable, but
> respond to the edit/activate action and use (maybe after validating) the
> new value. You should find examples of this in various programs, or you
> can read the implementations of the add_column_editable() methods, which
> also do this.

I have tried connecting a member function to the cell renderer's 
signal_toggled() slot, which as far as I can see is the only available slot for 
a CellRendererToggle. This doesn't do a lot i.e. my breakpoint within the 
slot-function never gets hit.

The thing that's really baffling me is that when I originally had the bool and 
string in different view columns and added the column using 
append_column_editable (after following some of the example code), everything 
worked absolutely fine.

I looked in the treeview.h header for the implementation as you suggested, but 
it requires the use of machinery that isn't part of the gtkmm client interface.
Also, none of the examples have similar functionality i.e. an /editable/ model 
column bundled with a non-editable model-column in a single view-column.

Is there any reason that you know of as to why doing it this way should be so 
different/convoluted/non-obvious/un-documented? In case you can't tell, I'm 
pushing for more information to be made available on this subject with the gtkmm 
distribution :) This is something I'll be glad to help with if I can ever figure 
this out.

I'm beginning to think that the functionality is actually missing, or at least 
not exposed to gtkmm clients as well as it should be. Perhaps I should put 
together a tiny program in the hope that someone can provide the two-line fix 
I'm after?!

Edd