Re: [gtkmm] Problem with Gdk::Pixbuf in Gtk::TreeView

[Martin Schulze <martin-ml hippogriff de>]

Am 2003.09.03 12:15 schrieb(en) Simon Fuhrmann:
> Hi there!
>
> I have problems settung up a Gtk::TreeView with a column that can
> display a Glib::RefPtr<Gtk::Pixbuf>.
>
> On execution of my code the following error message appears for each
> row I insert into my Gtk::ListStore:
>
> (simfm:2255): GLib-GObject-WARNING **: unable to set property `text'
> of
> type `gchararray' from value of type `GdkPixbuf'

This cryptic error message usually means that the a wrong CellRenderer
(probably CellRendererText) is set up for the column. (-> pixbufs
cannot be converted into text, of course).

Strange, because there is a template specialization of
generate_cellrenderer() (file treeviewcolumn.h) for
Glib::RefPtr<Gdk::Pixbuf>. Is your debugger stable enough so that
you can step into
  this->tree_view.append_column ("Icon", this->column_set.icon);
until you reach generate_cellrenderer() ?

It would be better, of course, if someone else could fill us
in with his experience with pixbuf columns ...

> The Gtk::TreeView is OK in my application but I miss the pixbufs.
>
> Here is the class for the Gtk::TreeModelColumns (ColumnRecord):
>
> ----------8<----------
>
> class cFileListColumns : public Gtk::TreeModel::ColumnRecord
> {
>   public:
>     cFileListColumns (void)
>       {
>         add(this->icon);    add(this->filename);
>         add(this->size);    add(this->uid);
>         add(this->gid);     add(this->inode);
>         add(this->blocks);  add(this->hlink);
>       }
>     Gtk::TreeModelColumn<Glib::RefPtr<Gdk::Pixbuf> > icon;
>     Gtk::TreeModelColumn<Glib::ustring> filename;
>     Gtk::TreeModelColumn<unsigned int> size;
>     Gtk::TreeModelColumn<unsigned int> uid;
>     Gtk::TreeModelColumn<unsigned int> gid;
>     Gtk::TreeModelColumn<unsigned int> inode;
>     Gtk::TreeModelColumn<unsigned int> blocks;
>     Gtk::TreeModelColumn<unsigned int> hlink;
> };
>
> ----------8<----------
>
> One of the columns has the Pixbuf, the "icon" column.
>
> Here comes the code that creates the columns in the Gtk::TreeView
>
> ----------8<----------
>
> void
> cFileList::create_columns (void)
> {
>   /* FIXME: This relation causes errors */
>   this->tree_view.append_column ("Icon", this->column_set.icon);
>   /* This works. */
>   this->tree_view.append_column ("Filename",
> this->column_set.filename);
>   this->tree_view.append_column ("Size", this->column_set.size);
>   this->tree_view.append_column ("UID", this->column_set.uid);
>   this->tree_view.append_column ("GID", this->column_set.gid);
>   this->tree_view.append_column ("Blocks", this->column_set.blocks);
>   this->tree_view.append_column ("Hlink", this->column_set.hlink);
> }
>
> ----------8<----------
>
> I figured out that the problem has something to do with the relation
> of
> the Gtk::TreeView::Column and the Gtk::ModelViewColumn. Because the
> error messages appear even if I omit filling a
> Glib::RefPtr<Gdk::Pixbuf>
> into the store. If I create the Gtk::TreeView::Column manually with a
> Gtk::CellRendererPixbuf without that relation, I don't get this error
> message (but no pixbufs aswell, of corse).

Try to append the manually created column and see if it works then.

Regards,

  Martin



> Finally the code that fills the store:
>
> ----------8<----------
>
> void
> cFileListStore::set_dir (boost::shared_ptr<cDir> dir)
> {
>   this->directory = dir;
>   for (unsigned int i = 0; i < dir->get_count(); ++i)
>     {
>       boost::shared_ptr<cFile> file = (*dir)[i];
>       Gtk::TreeModel::Row row = *(this->store->append());
>       row[this->column_set.icon] = cIconBase::get_broken();
>       row[this->column_set.filename] = file->get_name ();
>       row[this->column_set.size] = file->get_size ();
>       row[this->column_set.uid] = file->get_uid ();
>       row[this->column_set.gid] = file->get_gid ();
>       row[this->column_set.inode] = file->get_inode ();
>       row[this->column_set.blocks] = file->get_blocks ();
>       row[this->column_set.hlink] = file->get_hlink_count ();
>     }
>   return;
> }
>
> ----------8<----------
>
> I'm absolutly sure that ``cIconBase::get_broken()'' returns a valid
> Glib::RefPtr<Gdk::Pixbuf>. And like I said above, if I omit that line
> the errors still appear.
>
> I hope anyone can help, any sample code would be enough I think.
>
> Thanks.
>
> Regards,
>
> --
> Simon Fuhrmann | NightSlayer at gmx.de | http://www.dismember.de
> All people talk about the real life, but where can I download it?
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