Re: drag/drop after sort

[Dan Espen <dane mk telcordia com>]

muppet <scott asofyet org> writes:
> On Dec 31, 2004, at 1:32 PM, Dan Espen wrote:
>
> > Torsten Schoenfeld <kaffeetisch gmx de> writes:
> > > So, manually reordering a sorted list with d'n'd
> > > wouldn't have any effect, since moved rows would automatically jump  
> > > back
> > > to their original position -- hence d'n'd reordering is disabled when
> > > sorting is enabled.
> >
> > If that is the design, I think its a bad design.  I sort on one or 2  
> > columns to get the approximate order I need and then drag/drop the  
> > remaining rows that didn't land where I wanted them to.
> >
> > I think that's entirely normal for a list of things without unique  
> > keys.
>
> Not necessarily bad design --- in 90% of use cases for a sortable list  
> or tree, you want completely automatic sorting, and this works very  
> well.  What you're wanting is to use the sorting functions as  
> single-shot helpers for manual sorting, which is a special case.

It may be good for 90% of the cases, but I've written 2 apps
using GTK1, and both of them require this functionality.
So for me, it's bad in 100% of the cases.
I have no problem with the default behavior, its the inability
to turn it off that I consider bad design.

> > I take it, there is no way to clear this "sorted" indicator?
> > I'm searching the sources and I don't see the indicator, let
> > alone a way to clear it.
>
> According to the TreeSortable iface docs, it looks like you either set  
> a sort func or set the sort column id to "default":
>
> http://developer.gnome.org/doc/API/2.0/gtk/GtkTreeSortable.html#gtk- 
> tree-sortable-set-default-sort-func
>
> "If sort_func is NULL, then there will be no default comparison  
> function. This means that once the model has been sorted, it can't go  
> back to the default state. In this case, when the current sort column  
> id of sortable is GTK_TREE_SORTABLE_DEFAULT_SORT_COLUMN_ID, the model  
> will be unsorted."

Are you saying this will clear the sorted status?
I tried:

  $slist->get_model->set_default_sort_func(FALSE);
  $ctree->set_sort_column_id(-1);

Neither of which helps.

The -1 is GTK_TREE_SORTABLE_DEFAULT_SORT_COLUMN_ID,
and I took a wild guess on the default sort func.

> There's also the column's set_sort_indicator() and set_sort_order()  
> methods --- set_sort_indicator() tells the column whether to show the  
> sort direction indicator, while set_sort_order() tells the column  
> whether to sort up or down.
>
> http://developer.gnome.org/doc/API/2.0/gtk/GtkTreeViewColumn.html#gtk- 
> tree-view-column-set-sort-order

I've been able to clear the arrow, but it didn't help with the
problem I have.  Setting the sort order to ascending or descending
doesn't help either.  It doesn't look like it will accept a
sort order of 'none' or 'unsorted'.
 
> > After reading the first part of this, my first inclination was to copy  
> > the SimpleList data somewhere else, destroy the SimpleList and  
> > recreate it.
>
> If you don't have huge amounts of data, this can be done easily by  
> simply populating a new model with the contents of the old model, then  
> swapping out the models and destroying the old one; that way the view  
> doesn't have to be recreated.  This won't work with SimpleList, though  
> -- SimpleList caches a reference to the model in the TiedRow class and  
> connects some signals to the model when setting up the view, so  
> swapping the model would be bad.

Well I have a SimpleList.  I know how to get the data out of it,
but it looks like it doesn't have a 'delete' method.
I just tried:

$slist = Gtk2::SimpleList->new (@colTitles);

but that didn't seem to do anything.
I guess you are saying there is no way to kill off a SimpleList
and create a new one?

This is a small amount of data.

I did find the "test.pl" sample in the gtk perl package which
has a button for ctree which brings up a Ctree that lets you
sort columns and rearrange freely.  I couldn't figure out
how mimic what it does with SimpleList.
Nor could I identify what it does to allow dnd after
a column sort.

-- 
Dan Espen                           E-mail: dane mk telcordia com