Re: weird behavior with TreeModel

[Nalin Singal <nalinsingal yahoo co in>]

Sorry for breaking up the reply.

Regarding the reorderable columns. When you do
menuColumns.id.set_reorderable(), you are trying to
set the column in the treeModel as reoderable. But
actually the column in the treeView is the one which
should be reorderable. Remember there are two
different sets of columns - one in the treemodel and
one in the treeview which are backed up by the
treemodel columns. So the columns in the treeview are
the ones which can be reordered and not the ones in
the treemodel because reordering is just a view thing.
So as you are doing the for loop, get the column you
want to set as reorderable from the treeview and call
set_reorderable on it.

Hope this helps :)

-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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