Re: Removing a pixmap from a Gtk::CtreeNode

[Paolo Molaro <lupus ximian com>]

On 11/12/01 Raul Dias wrote:
> I am wondering how does a a pixmap works inside a node/row in a Gtk::CTree 
> (or Gtk::CList) and what's the best way to remove/clean it.
>
> AFAIK (please correct me if I am wrong), a Gtk::Gdk::Pixmap is the pixmap stored
> in the X11 server itself and a Gtk::Pixmap is a widget which can be used to display
> a Gtk::Gdk::Pixmap.
>
> To add a pixmap in the 2nd column of a Gtk::CTreeNode I use:
> $ctree->node_set_pixmap( $node, 1, $gtk_gdk_pixmap, $mask);
>
> Now when I retrieve it to destroy() it I use:
>
> ($pixmap, $mask) = $ctree->node_get_pixmap( $node, 1);
>
> However $pixmap is a Gtk::Gdk::Pixmap and not a Gtk::Pixmap,
> which means that I can't destroy() it.

A Gtk::Gdk::Pixmap will be automatically destroyed when it's reference
count drops to 0, you don't need to do anything. The same holds true for
widgets (except Gtk::Window ones: they are special since they are
toplevel widgets).

> So, I ask: Did the Gtk::CTreeNode create and Gtk::Pixmap, when I inserted it?
> If so, how can I retrieve it (to destroy and free memory) ?

Gtk::CTreeNode didn't create a Gtk::Pixmap. If you want the
Gtk::Gdk::Pixmap to disappear, use:

        $ctree->node_set_text ($node, $column, "");

> If not, how does it work?  how can I clean the column (cell) ?
>
> Right now I am using $ctree->node_set_text ( '', 1);
> However knowing gtk+, I would suppose it creates a label (empty) to place in there.

Nope, the Gtk::CTree widget renders the cell contents itself, it doesn't
create label widgets at all.

lupus

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