Re: STL Predicate for searching a treeview columns

["Erik Ohrnberger" <Erik echohome org>]

thomschu,
    Thanks.  That looks better to me than a for loop with a boolean exit
flag!

    Erik.

On Wed, March 15, 2006 03:19, thomschu wrote:
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> Ohrnberger, Erik wrote:
>
> | Started learning more and more about the STL, and found that it is
> | really easy and convenient to use Predicate templates to search STL
> | containers that are not indexed, like list and vector.
> |
> | For example, if you have a vector of strings, the code ends up
> | looking something like this:
> |
> | // Predicate for searching a vector of strings // Example use: //
> | iter = find_if( container.begin(), container.end(), StrListPred( s
> | ) ); class StrListPred { public: StrListPred( std::string x )    : id(
> | x ) { }
> |
> | bool operator()( const std::string& o ) const { return o == id; }
> | protected: const std::string            id; };
> |
> | Now, has anyone used this technique to search a TreeViewModel?  If
> | so, could you please share your code?  (I want to get rid of all
> | the ugly, non-STL like individual search loops if possible).
> |
> | Thanks in advance, Erik.
> | _______________________________________________ gtkmm-list mailing
> | list gtkmm-list gnome org
> | http://mail.gnome.org/mailman/listinfo/gtkmm-list
> |
> |
> Hi,
> TreeModel has functions foreach_iter(), foreach() and foreach_path().
> (so far i know STL has a foreach as well)
> I search in a TreeViewModel like this :
> I have a function search() which gets a string Im looking for (in this
> case I look for it in the column "name").
> The function search() uses the foreach_path()-function from the
> TreeModel which calls a callback-method for each
> row. In addition with the help of the libsig++ I bind 2 more
> Parameters - the query Im looking for and the path
> which is my return value (the path to the Row in which I found the
> "name" with the requested value).
> Maybe not as convinient as you wanted. :-)
>
> bool MyTreeView::on_foreach_node(const Gtk::TreeModel::Path &path,
> std::string query, std::string *r_path)
> {
> ~  Gtk::TreeModel::iterator iter = m_refTreeStore->get_iter(path);
> ~  const Gtk::TreeModel::Row row = *iter;
> ~  std::string name = row[m_columns.name];
> ~  if(name == query) {
> ~    r_path->assign(path.to_string());
> ~    return true;
> ~  }
> ~  return false;
> }
>
> std::string MyTreeView::searchName(std::string query)
> {
> ~  std::string path = "";
>
> ~  m_refTreeStore->foreach_path(sigc::bind(sigc::mem_fun(*this,
> &MyTreeView::on_foreach_node), query, &path));
>
> ~  return path;
>
> }
>
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