Re: hideing elements of the gtktreemodel

[Domsodi Gergely <doome uhulinux hu>]

Hi!

Thanks for the solution, but I think it is not good for me because you
remove the rows from the model.

I need a solution what only changes the visibility of the rows, and
doesn't alter any other things (so the model shall remain unchanged I
think). So if i do a foreach() or an itern_nth_child() on its parent,
the hidden row shall do as if it were there.

Thanks in advance!

On Wed, 27 Aug 2003 01:48:53 +0200
Torsten Schoenfeld <kaffeetisch web de> wrote:

> On Tue, 26 Aug 2003 14:37:17 +0200, Domsodi Gergely wrote:
> 
> > What are the possibilities of showing just a part of the model, not
> > the whole one?
> 
> I use the following to achieve something similiar: hide rows of a list
> store if they don't match a given pattern. I'm sure you can modify it
> to work on trees.
> 
> sub filter {
>   my ($filter_name, $filter_home, $filter_mobile) = @_;
> 
>   # first, re-add all hidden rows so that they're processed again.
>   # automatic sorting is assumed.
>   foreach (@{$model -> { _hidden }}) {
>     $model -> set(
>       $model -> append(),
>       COLUMN_NAME, $_ -> [0],
>       COLUMN_HOME, $_ -> [1] || "",
>       COLUMN_MOBILE, $_ -> [2] || "");
>   }
> 
>   $model -> { _hidden } = [];
>   my @victims = ();
> 
>   # at least one filter has to be defined.
>   if ($filter_name ne "" || $filter_home ne "" || $filter_mobile ne
>   "") {
>     # iterate over every row.
>     $model -> foreach(sub {
>       my ($model, $path, $iterator) = @_;
>       my ($value_name,
>           $value_home,
>           $value_mobile) = ($model -> get($iterator, COLUMN_NAME),
>                             $model -> get($iterator, COLUMN_HOME),
>                             $model -> get($iterator, COLUMN_MOBILE));
> 
>       # see if the values match the patterns; a simple substring match
>       #  
>       # in this case.
>       unless (index($value_name, $filter_name) > -1 &&
>               index($value_home, $filter_home) > -1 &&             
>               index($value_mobile, $filter_mobile) > -1) {
>         # if the row doesn't match all criteria, add its values to the
>         # list of hidden rows.
>         push(@{$model -> { _hidden }}, [$value_name, $value_home,
>         $value_mobile]);
> 
>         # and store a row reference to it in the victims array for
>         # later removal. you can't just use the path or an iterator
>         # here     because the store may change further. row
>         # references listen to all relevant signals and adjust
>         # themselves accordingly so that  they're still valid when we
>         # need them. you also can't just remove the row at this point
>         # as this would totally confuse $model -> foreach() and make
>         # all your iterators invalid.
>         push(@victims, Gtk2::TreeRowReference -> new($model, $path));
>       }
> 
>       # make sure to return zero here to make $model -> foreach() go
>       # on.
>       return 0;
>     });
> 
>     # all that's left now is to remove the matching rows.
>     foreach (@victims) {
>       $model -> remove($model -> get_iter($_ -> get_path()));
>     }
>   }
> 
>   return 1;
> }
> 
> I thought about submitting this as a FAQ or a recipe but am unsure
> whether it's relevant.
> 
> HTH,
> -Torsten
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-- 
doome