Re: weird behavior with TreeModel

[Nalin Singal <nalinsingal yahoo co in>]

Well John, about the first error(Re: clearing the
model) - you are doing menuTreeModel.clear(). This
clears the model itself as you just cleared the
POINTER. Do menuTreeModel->clear(), instead.

-Nalin

--- John Taber <jtaber johntaber net> wrote:

> Has anyone else had problems with TreeModel?
> 1) If I try to append rows after using
> TreeModel.clear(), it segfaults.
> 2) If I try to define a column as reorderable - it
> does not compile but 
> if I put it in a loop thru all the columns it
> compiles okay.
> 3) I'm getting weird behavior when using a table
> refresh function 
> (setListToDisplay) - sometimes the view does not
> load the data, some 
> times I get a glibmm memory error.
> 
> I'm running gtkmm 2.6.1 with gtk 2.6.4 with gcc
> 3.3.5 on debian sid
> 
> Here's excerpt of what I've been using - anything
> wrong in what I'm doing?
> 
> in .h file:
>      virtual void menuTreeOnClicked(const
> Gtk::TreeModel::Path& path,
>          Gtk::TreeViewColumn* column);
>      //------ menu tree ----------
>      class ModelColumns : public
> Gtk::TreeModel::ColumnRecord {
>      public:
>          ModelColumns() {
>              add(id);
>              add(name);
>          }
>          Gtk::TreeModelColumn<int>id;
>          Gtk::TreeModelColumn<std::string>name;
>      };
>      ModelColumns menuColumns;
>      Gtk::ScrolledWindow menuWindow;
>      Gtk::TreeView menuTreeView;
>      Glib::RefPtr<Gtk::ListStore> menuTreeModel;
> 
> in .cpp file
>      //---------- menu tree 
> -------------------------
>      menuTreeModel =
> Gtk::ListStore::create(menuColumns);
>      menuTreeView.set_model(menuTreeModel);
>      //Gtk::TreeModel::Row row =
> *(menuTreeModel->append());
>      //row[menuColumns.id] = 0;
>      //row[menuColumns.name] = "";
>      menuTreeView.append_column("ID",
> menuColumns.id);
>      //(menuColumns.id).set_reorderable();
>      menuTreeView.append_column("Name",
> menuColumns.name);
>      for(int i=0;i<2;i++) {
>          Gtk::TreeView::Column* mColumn =
> menuTreeView.get_column(i);
>          mColumn->set_reorderable();
>      }
>      menuWindow.set_policy(Gtk::POLICY_AUTOMATIC,
> Gtk::POLICY_AUTOMATIC);
>      menuWindow.add(menuTreeView);
>     
>
menuTreeView.signal_row_activated().connect(sigc::mem_fun(*this,
>            &LanduseListDialog::menuTreeOnClicked) );
> .....
> void
>
LanduseListDialog::setListToDisplay(std::vector<Data*>data)
> {
>      if (data.empty()) {return;}
>      //menuTreeModel.clear();
>      Gtk::TreeModel::Row row;
>      for (uint i=0;i<data.size();i++) {
>          row = *(menuTreeModel->append());
>          row[menuColumns.id] = data[i]->getid();
>          row[menuColumns.name] = data[i]->getname();
>      }
> }
> 
> 
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