Re: How to remove selected items

[Armin Burgmeier <armin arbur net>]

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Robert Caryl wrote:
> Furthermore, I am going to assume that you have written a function in
> your class that will serve as the callback slot parameter for  
> Gtk::TreeSelection::selected_foreach_iter.  In this callback slot you
> should make a call to Gtk::TreeModel::erase using the iterator passed as
> its formal parameter, and voila!  Your selected rows will be deleted. 

The GTK+ documentation states the following for
gtk_tree_selection_selected_foreach: "Note that you cannot modify the
tree or selection from within this function."

This is the way I did it. It is plain C, but you probably get the idea.
It is perhaps even possible to avoid the conversion to iterators if you
delete the rows in the reverse order (from bottom to top).

static void
cg_element_editor_remove_button_clicked_cb (G_GNUC_UNUSED GtkButton *button,
                                            gpointer user_data)
{
	CgElementEditor *editor;
	CgElementEditorPrivate *priv;
	GtkTreeSelection *selection;
	GtkTreeIter *iter;
	GtkTreePath *path;
	GList *selected_rows;
	GList *selected_iters;
	GList *cur_item;
	
	editor = CG_ELEMENT_EDITOR (user_data);
	priv = CG_ELEMENT_EDITOR_PRIVATE (editor);
	selection = gtk_tree_view_get_selection (priv->view);
	selected_rows = gtk_tree_selection_get_selected_rows (selection, NULL);
	selected_iters = NULL;

	/* Convert paths to iters because changing the model borks offsets
	 * in paths, but since GtkListStore has GTK_TREE_MODEL_PERSIST set,
	 * iters continue to live after changing the model. */
	for (cur_item = selected_rows; cur_item != NULL; cur_item = cur_item->next)
	{
		path = cur_item->data;
		iter = g_new (GtkTreeIter, 1);

		gtk_tree_model_get_iter (priv->list, iter, path);
		selected_iters = g_list_prepend (selected_iters, iter);

		gtk_tree_path_free (path);
	}
	
	for (cur_item = selected_iters;
	     cur_item != NULL;
	     cur_item = cur_item->next)
	{
		iter = cur_item->data;
		gtk_list_store_remove (GTK_LIST_STORE (priv->list), iter);
		g_free (iter);
	}
	
	g_list_free (selected_rows);
	g_list_free (selected_iters);
}

Greetings,
Armin
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