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Check Gtk2::ListStore empty or not
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Check Gtk2::ListStore empty or not
by Peter Dennis-2
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Hi All,
Is it possible to check if a Gtk2::ListStore is empty? At the moment I have a combo box with a list of items. The user can select items from the combo box and add them to a list. But I don't want them to be able to add duplicate items to the list. So first I was going to check if the list was empty. If it was then it can add an item, but if it wasn't then get an array of the items already in the list store, loop through them checking that the combo selection isn't already there and then add the item. I'm not entirely sure how to check if the list is empty. At the moment I'm trying: if ($list_store->get_iter_first) #or if (defined $list_store->get_iter_first) # get what's there and check for duplicates else # add item to list but this doesn't work because when I try to get everything from my first column: my @col1 = $list_store->get($list_iter, 1); It says: variable not allowed to be undef where GtkTreeIter is wanted at line 331 which matches the 'my @col1' line above. Could someone please help me with the testing logic. I understand it needs to be defined, but it can only be defined if there's something in the row, but then I can't test if it's empty. Very confused..... Many thanks, Peter. _______________________________________________ gtk-perl-list mailing list gtk-perl-list@... http://mail.gnome.org/mailman/listinfo/gtk-perl-list |
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Re: Check Gtk2::ListStore empty or not
by Tadej Borovšak
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Hi.
I would use construct like this one: --- CODE --- my $iter = $list_store->get_iter_first; if( $iter ) # Get contents of first line my @line = $list_store->get( $iter ); else # Add new line --- CODE --- This might not be the best way, but it should work. Tadej -- Tadej Borovšak tadeboro.blogspot.com tadeboro@... tadej.borovsak@... _______________________________________________ gtk-perl-list mailing list gtk-perl-list@... http://mail.gnome.org/mailman/listinfo/gtk-perl-list |
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Re: Check Gtk2::ListStore empty or not
by anguila
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integer = $tree_model->iter_n_children ($iter=undef)Returns the number of children $iter has. If $iter is undef (or omitted) then returns the number of toplevel nodes. with $list_store->iter_n_children(undef) you will know if is empty or not and the rows that it has throug a integer value.The way of tadej showed is correct too. David.
On Mon, Jul 27, 2009 at 1:49 PM, Tadej Borovšak <tadeboro@...> wrote: Hi. _______________________________________________ gtk-perl-list mailing list gtk-perl-list@... http://mail.gnome.org/mailman/listinfo/gtk-perl-list |
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Re: Check Gtk2::ListStore empty or not
by Peter Dennis-2
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2009/7/27 anguila <anguila@...>:
> integer = $tree_model->iter_n_children ($iter=undef) > > $iter (Gtk2::TreeIter or undef) > > Returns the number of children $iter has. If $iter is undef (or omitted) > then returns the number of toplevel nodes. > > with $list_store->iter_n_children(undef) you will know if is empty or not > and the rows that it has throug a integer value. > > > The way of tadej showed is correct too. > > David. > > On Mon, Jul 27, 2009 at 1:49 PM, Tadej Borovšak <tadeboro@...> wrote: >> >> Hi. >> >> I would use construct like this one: >> >> --- CODE --- >> my $iter = $list_store->get_iter_first; >> if( $iter ) >> # Get contents of first line >> my @line = $list_store->get( $iter ); >> else >> # Add new line >> >> --- CODE --- >> >> This might not be the best way, but it should work. >> >> Tadej >> Thank you both for the suggestions. I will try them out and see how I go. _______________________________________________ gtk-perl-list mailing list gtk-perl-list@... http://mail.gnome.org/mailman/listinfo/gtk-perl-list |
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