Sorry, I'm wrong about point (1) :(
I've actually put 3 different types of renderers in the same column.
I'm attaching more of my codes for your reference:
(header file)
Gtk::CellRendererToggle renderer_selected;
Gtk::CellRendererPixbuf renderer_type_pixbuf;
Gtk::CellRendererText renderer_1;
Gtk::TreeViewColumn col_1;
(source file)
folder_type_pixbuf
= Gdk::Pixbuf::create_from_file("folder.png")->scale_simple(16, 16,
Gdk::INTERP_HYPER);
file_type_pixbuf
= Gdk::Pixbuf::create_from_file("file.png")->scale_simple(16, 16,
Gdk::INTERP_HYPER);
folder_pixbuf = Gdk::Pixbuf::create_from_file("folder.xpm");
folder_open_pixbuf = Gdk::Pixbuf::create_from_file("folder-open.xpm");
file_pixbuf = Gdk::Pixbuf::create_from_file("file.xpm");
col_1.set_title("Name");
col_1.pack_start(renderer_selected, true);
col_1.add_attribute(renderer_selected, "active", SELECTED_COL);
col_1.pack_start(renderer_type_pixbuf, true);
col_1.add_attribute(renderer_type_pixbuf, "pixbuf", TYPE_PIXBUF_COL);
col_1.add_attribute(renderer_type_pixbuf, "pixbuf_expander_closed",
TYPE_CLOSED_PIXBUF_COL);
col_1.add_attribute(renderer_type_pixbuf, "pixbuf_expander_open",
TYPE_OPEN_PIXBUF_COL);
col_1.pack_start(renderer_1, true);
col_1.add_attribute(renderer_1, "text", NAME_COL);
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