Re: Two questions

["Andrew E. Makeev" <andrew solvo ru>]

Konstantin L Kouptsov wrote:

> In my program I would like to have a ListStore/TreeView list with 
> several columns, to which I will add additional rows. I also want that 
> each time the row is added, the (re)calculation over entire list is 
> performed, say, using on_row_added(). For the last thing, I need to 
> catch some event and connect it to my on_row_added() function.
>
> 1. To add a row I have the code as follows:
>
> // these are defined elsewhere
>
>  class StimListRow:public Gtk::TreeModel::ColumnRecord
>     { ... } glr,slr;
>  Glib::RefPtr<Gtk::ListStore> good_ref= Gtk::ListStore::create(glr);
>  Gtk::TreeView *treeview;
>
> // now the code:
>
>  Glib::RefPtr<Gtk::TreeSelection> Selection = treeview->get_selection();
>  Gtk::ListStore::iterator iter = Selection->get_selected();
>
>  treeview->remove_all_columns();
>  Gtk::ListStore::Row new_row = *(good_ref->append());
>  int time = row[slr.time];
>  int chan = row[slr.chan];
>  new_row[glr.time] = time;
>  new_row[glr.chan] = chan;
>  treeview->set_model(good_ref);
>  treeview->append_column("Stim", glr.time);
>  treeview->append_column("Channel", glr.chan);
>
> This works, but I am not sure this is the best way. Is there more 
> elegant way of doing that?
You don't need to remove and add columns every time, the same is about 
set_model.
Just call append() for your tree model store, and then set row cells.

> Also, thinking about events to catch, what are the events that may be 
> suitable for my task (i.e. to call recalculate() once after the row 
> was added)
>
>
> 2. When trying to add event handler to solve the previous task, I get 
> an error when adding the following line
>
> good_ref->signal_row_inserted().connect(SigC::slot(*this,&MyWindow::on_row_added),false); 
>
>
>
>
> MyWindow.cc: In member function `int TrigViewWindow::open_trg_file()':
> MyWindow.cc:410: error: no matching function for call to `
>    Glib::SignalProxy2<void, const Gtk::TreePath&, const Gtk::TreeIter&>::
>    connect(SigC::Slot0<void>, bool)'
> /usr/include/gtkmm-2.0/glibmm/signalproxy.h:159: error: candidates are:
>    SigC::Connection Glib::SignalProxy2<R, P1, P2>::connect(const 
> SigC::Slot2<R,
>    P1, P2>&, bool) [with R = void, P1 = const Gtk::TreePath&, P2 = const
>    Gtk::TreeIter&]
>
> Can someone shed a light on what's going on?
you were trying to connect function declared as "void open_trg_file()" 
to signal that requires function declaration like that: "void 
function(const Gtk::TreePath&, const Gtk::TreeIter)". There is 2 ways: 
1st - declare function with fake parameters, 2nd - use SigC adaptors 
(SigC::hide) to "hide" signal arguments.

> I also use glade to design interface, and some of the events added by 
> glade generate the same type of error. Perhaps I am missing something.

Sorry, not familiar with glade, but see problem solution above.

PS
May be we both could use russian to understand your needs better? :)