Guys,
I'm sure somebody here recently posted advice about tagging TreeModel entries
with arbitrary data using a hidden column.
I have an application where a ListStore is shown in a TreeView and each row
needs to be associated with an instance of a data class. At the moment it's a
horrid kludge because there is a std::vector of the data instances that needs
to be kept in the same order as the ListStore. So I tried to take the advice I
thought I'd read here.
class DLF_ModelColumns : public Gtk::TreeModel::ColumnRecord
{
public:
Gtk::TreeModelColumn<Glib::ustring> varname;
Gtk::TreeModelColumn<Glib::ustring> value;
Gtk::TreeModelColumn<Glib::ustring> units;
Gtk::TreeModelColumn<Glib::ustring> description;
#ifndef SEPARATE_LIST_OF_ITEMS
// Gtk::TreeModelColumn< Glib::RefPtr<DLF_ScreenItem> > dataitem;
Gtk::TreeModelColumn<DLF_ScreenItem*> dataitem;
// Gtk::TreeModelColumn< Glib::Value<DLF_ScreenItem*> > dataitem;
#endif
Gtk::TreeModelColumn<int> objindex;
DLF_ModelColumns() {
add(varname); add(value); add(units); add(description);
#ifndef SEPARATE_LIST_OF_ITEMS
add(dataitem);
#endif
add(objindex);
}
};
As you can see, I've been playing. The two commented out variants of "dataitem"
don't even compile. The integer "objindex" (as shown in the tutorial) appears
fine, but doesn't really do what I need. If I include "dataitem" (by undefining
the magic symbol) then the code builds OK and mostly seems to work except that
I get HUGE NUMBERS of GTK warnings and criticals when I run it.
(ovscal:16841): GLib-GObject-WARNING **: gvalue.c:96: cannot initialize GValue
with type `(null)', this type has no GTypeValueTable implementation
(ovscal:16841): GLib-GObject-CRITICAL **: g_value_unset: assertion `G_IS_VALUE
(value)' failed
(ovscal:16841): GLib-GObject-WARNING **: gtype.c:3339: type id `0' is invalid
(ovscal:16841): GLib-GObject-WARNING **: can't peek value table for type
`<invalid>' which is not currently referenced
So what am I doing wrong? How am I supposed to associate an arbitrary data item
with a ListStore row?
Thanks,
Rob
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