Using a GtkTreeModelSort

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24

{
  GtkTreeView *tree_view1;
  GtkTreeView *tree_view2;
  GtkTreeModel *sort_model1;
  GtkTreeModel *sort_model2;
  GtkTreeModel *child_model;

  // get the child model
  child_model = get_my_model ();

  // Create the first tree
  sort_model1 = gtk_tree_model_sort_new_with_model (child_model);
  tree_view1 = gtk_tree_view_new_with_model (sort_model1);

  // Create the second tree
  sort_model2 = gtk_tree_model_sort_new_with_model (child_model);
  tree_view2 = gtk_tree_view_new_with_model (sort_model2);

  // Now we can sort the two models independently
  gtk_tree_sortable_set_sort_column_id (GTK_TREE_SORTABLE (sort_model1),
                                        COLUMN_1, GTK_SORT_ASCENDING);
  gtk_tree_sortable_set_sort_column_id (GTK_TREE_SORTABLE (sort_model2),
                                        COLUMN_1, GTK_SORT_DESCENDING);
}

To demonstrate how to access the underlying child model from the sort model, the next example will be a callback for the GtkTreeSelection “changed” signal. In this callback, we get a string from COLUMN_1 of the model. We then modify the string, find the same selected row on the child model, and change the row there.

Accessing the child model of in a selection changed callback

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39

void
selection_changed (GtkTreeSelection *selection, gpointer data)
{
  GtkTreeModel *sort_model = NULL;
  GtkTreeModel *child_model;
  GtkTreeIter sort_iter;
  GtkTreeIter child_iter;
  char *some_data = NULL;
  char *modified_data;

  // Get the current selected row and the model.
  if (! gtk_tree_selection_get_selected (selection,
                                         &sort_model,
                                         &sort_iter))
    return;

  // Look up the current value on the selected row and get
  // a new value to change it to.
  gtk_tree_model_get (GTK_TREE_MODEL (sort_model), &sort_iter,
                      COLUMN_1, &some_data,
                      -1);

  modified_data = change_the_data (some_data);
  g_free (some_data);

  // Get an iterator on the child model, instead of the sort model.
  gtk_tree_model_sort_convert_iter_to_child_iter (GTK_TREE_MODEL_SORT (sort_model),
                                                  &child_iter,
                                                  &sort_iter);

  // Get the child model and change the value of the row. In this
  // example, the child model is a GtkListStore. It could be any other
  // type of model, though.
  child_model = gtk_tree_model_sort_get_model (GTK_TREE_MODEL_SORT (sort_model));
  gtk_list_store_set (GTK_LIST_STORE (child_model), &child_iter,
                      COLUMN_1, &modified_data,
                      -1);
  g_free (modified_data);
}

gtk_tree_model_sort_new_with_model ()

GtkTreeModel *
gtk_tree_model_sort_new_with_model (GtkTreeModel *child_model);

Creates a new GtkTreeModelSort, with child_model as the child model.

[constructor]

gtk_tree_model_sort_get_model ()

GtkTreeModel *
gtk_tree_model_sort_get_model (GtkTreeModelSort *tree_model);

Returns the model the GtkTreeModelSort is sorting.

gtk_tree_model_sort_convert_child_path_to_path ()

GtkTreePath *
gtk_tree_model_sort_convert_child_path_to_path
                               (GtkTreeModelSort *tree_model_sort,
                                GtkTreePath *child_path);

Converts child_path to a path relative to tree_model_sort . That is, child_path points to a path in the child model. The returned path will point to the same row in the sorted model. If child_path isn’t a valid path on the child model, then NULL is returned.

gtk_tree_model_sort_convert_child_iter_to_iter ()

gboolean
gtk_tree_model_sort_convert_child_iter_to_iter
                               (GtkTreeModelSort *tree_model_sort,
                                GtkTreeIter *sort_iter,
                                GtkTreeIter *child_iter);

Sets sort_iter to point to the row in tree_model_sort that corresponds to the row pointed at by child_iter . If sort_iter was not set, FALSE is returned. Note: a boolean is only returned since 2.14.

gtk_tree_model_sort_convert_path_to_child_path ()

GtkTreePath *
gtk_tree_model_sort_convert_path_to_child_path
                               (GtkTreeModelSort *tree_model_sort,
                                GtkTreePath *sorted_path);

Converts sorted_path to a path on the child model of tree_model_sort . That is, sorted_path points to a location in tree_model_sort . The returned path will point to the same location in the model not being sorted. If sorted_path does not point to a location in the child model, NULL is returned.

gtk_tree_model_sort_convert_iter_to_child_iter ()

void
gtk_tree_model_sort_convert_iter_to_child_iter
                               (GtkTreeModelSort *tree_model_sort,
                                GtkTreeIter *child_iter,
                                GtkTreeIter *sorted_iter);

Sets child_iter to point to the row pointed to by sorted_iter .

gtk_tree_model_sort_reset_default_sort_func ()

void
gtk_tree_model_sort_reset_default_sort_func
                               (GtkTreeModelSort *tree_model_sort);

This resets the default sort function to be in the “unsorted” state. That is, it is in the same order as the child model. It will re-sort the model to be in the same order as the child model only if the GtkTreeModelSort is in “unsorted” state.

gtk_tree_model_sort_clear_cache ()

void
gtk_tree_model_sort_clear_cache (GtkTreeModelSort *tree_model_sort);

This function should almost never be called. It clears the tree_model_sort of any cached iterators that haven’t been reffed with gtk_tree_model_ref_node(). This might be useful if the child model being sorted is static (and doesn’t change often) and there has been a lot of unreffed access to nodes. As a side effect of this function, all unreffed iters will be invalid.

gtk_tree_model_sort_iter_is_valid ()

gboolean
gtk_tree_model_sort_iter_is_valid (GtkTreeModelSort *tree_model_sort,
                                   GtkTreeIter *iter);

Checks if the given iter is a valid iter for this GtkTreeModelSort.

Since: 2.2

struct GtkTreeModelSort

struct GtkTreeModelSort;

The “model” property

  “model”                    GtkTreeModel *

The model for the TreeModelSort to sort.

Owner: GtkTreeModelSort

Flags: Read / Write / Construct Only