GtkListStore
A list-like data structure that can be used with the #GtkTreeView
The #GtkListStore object is a list model for use with a #GtkTreeView
widget. It implements the #GtkTreeModel interface, and consequentialy,
can use all of the methods available there. It also implements the
#GtkTreeSortable interface so it can be sorted by the view.
Finally, it also implements the tree drag and
drop interfaces.
The #GtkListStore can accept most GObject types as a column type, though
it can't accept all custom types. Internally, it will keep a copy of
data passed in (such as a string or a boxed pointer). Columns that
accept #GObjects are handled a little differently. The
#GtkListStore will keep a reference to the object instead of copying the
value. As a result, if the object is modified, it is up to the
application writer to call @gtk_tree_model_row_changed to emit the
"row_changed" signal. This most commonly affects lists with
#GdkPixbufs stored.
Creating a simple list store.
enum {
COLUMN_STRING,
COLUMN_INT,
COLUMN_BOOLEAN,
N_COLUMNS
};
{
GtkListStore *list_store;
GtkTreePath *path;
GtkTreeIter iter;
gint i;
list_store = gtk_list_store_new (N_COLUMNS,
G_TYPE_STRING,
G_TYPE_INT,
G_TYPE_BOOLEAN);
for (i = 0; i < 10; i++)
{
gchar *some_data;
some_data = get_some_data (i);
/* Add a new row to the model */
gtk_list_store_append (list_store, &iter);
gtk_list_store_set (list_store, &iter,
COLUMN_STRING, some_data,
COLUMN_INT, i,
COLUMN_BOOLEAN, FALSE,
-1);
/* As the store will keep a copy of the string internally, we
* free some_data.
*/
g_free (some_data);
}
/* Modify a particular row */
path = gtk_tree_path_new_from_string ("4");
gtk_tree_model_get_iter (GTK_TREE_MODEL (list_store),
&iter,
path);
gtk_tree_path_free (path);
gtk_list_store_set (list_store, &iter,
COLUMN_BOOLEAN, TRUE,
-1);
}
Performance Considerations
Internally, the #GtkListStore was implemented with a linked list with a
tail pointer prior to GTK+ 2.6. As a result, it was fast at data
insertion and deletion, and not fast at random data access. The
#GtkListStore sets the #GTK_TREE_MODEL_ITERS_PERSIST flag, which means
that #GtkTreeIters can be cached while the row exists. Thus, if
access to a particular row is needed often and your code is expected to
run on older versions of GTK+, it is worth keeping the iter around.
#GtkTreeModel, #GtkTreeStore
@n_columns:
@Varargs:
@Returns:
@n_columns:
@types:
@Returns:
@list_store:
@n_columns:
@types:
@list_store:
@iter:
@Varargs:
@list_store:
@iter:
@var_args:
@list_store:
@iter:
@column:
@value:
@list_store:
@iter:
@Returns:
@store:
@list_store:
@iter:
@position:
@store:
@list_store:
@iter:
@sibling:
@store:
@list_store:
@iter:
@sibling:
@store:
@list_store:
@iter:
@position:
@Varargs:
@list_store:
@iter:
@position:
@columns:
@values:
@n_values:
@list_store:
@iter:
@store:
@list_store:
@iter:
@store:
@list_store:
@list_store:
@iter:
@Returns:
@store:
@new_order:
@store:
@a:
@b:
@store:
@iter:
@position:
@store:
@iter:
@position: