#include <stdio.h>
#include <gtk/gtk.h>

static GtkTreeIter iter50;
static GtkTreePath *item50;
static GtkWidget *tree;

static void add_entries (GtkTreeStore *store, GtkTreeIter *parent)
{
    GtkTreeIter iter;
    int i;

    for (i = 0; i < 100; i++) {
        char string[ 256 ];
        gtk_tree_store_append (store, &iter, parent);
        sprintf (string, "item %d", i);
        gtk_tree_store_set (store, &iter, 0, string, -1);
        if (i == 50) {
            item50 = gtk_tree_model_get_path (GTK_TREE_MODEL (store), &iter);
            iter50 = iter;
        }
    }
}

static void button_clicked (GtkWidget *widget, gpointer data)
{
    GtkTreePath *path = item50;
    int depth = gtk_tree_path_get_depth (path);
    gint *indices = gtk_tree_path_get_indices (path);
    GtkTreePath *temp = gtk_tree_path_new ();
    int i;

    /* Workaround */
    /*
    for (i = 0; i < depth - 1; i++) {
        gtk_tree_path_append_index (temp, indices [i]);
        gtk_tree_view_collapse_row (GTK_TREE_VIEW (tree), temp);
    }
    temp = gtk_tree_path_new ();
    */

    for (i = 0; i < depth - 1; i++) {
        gtk_tree_path_append_index (temp, indices [i]);
        gtk_tree_view_expand_row (GTK_TREE_VIEW (tree), temp, FALSE);
    }
    gtk_tree_path_free (temp);

    gtk_tree_view_set_cursor (GTK_TREE_VIEW (tree), path, 0, FALSE);
}

int main (int argc, char **argv)
{
    GtkWidget *window;
    GtkWidget *scrolled;
    GtkTreeStore *store;
    GtkCellRenderer *renderer;
    GtkTreeViewColumn *column;
    GtkTreeIter iter;
    GtkWidget *button;
    GtkWidget *vbox;

    gtk_init (&argc, &argv);
    window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
    g_signal_connect (G_OBJECT (window), "destroy",
                      G_CALLBACK (gtk_main_quit), 0);
    g_signal_connect (G_OBJECT (window), "delete_event",
                      G_CALLBACK (gtk_main_quit), 0);

    vbox = gtk_vbox_new (FALSE, 0);
    button = gtk_button_new_with_label ("Scroll to item 50");
    g_signal_connect (G_OBJECT (button), "clicked",
                      G_CALLBACK (button_clicked), 0);
    gtk_box_pack_start (GTK_BOX (vbox), button, FALSE, FALSE, 0);

    scrolled = gtk_scrolled_window_new (0, 0);

    store = gtk_tree_store_new (1, G_TYPE_STRING);
    tree = gtk_tree_view_new_with_model (GTK_TREE_MODEL (store));
    gtk_tree_selection_set_mode (gtk_tree_view_get_selection (GTK_TREE_VIEW (tree)), GTK_SELECTION_MULTIPLE);
    renderer = gtk_cell_renderer_text_new ();
    column = gtk_tree_view_column_new_with_attributes
               ("Column", renderer, "text", 0, 0);
    gtk_tree_view_append_column (GTK_TREE_VIEW (tree), column);
    gtk_container_add (GTK_CONTAINER (scrolled), tree);
    gtk_container_add (GTK_CONTAINER (vbox), scrolled);
    gtk_container_add (GTK_CONTAINER (window), vbox);

    gtk_tree_store_append (store, &iter, 0);
    gtk_tree_store_set (store, &iter, 0, "oranges", -1);
    add_entries (store, &iter);
    add_entries (store, &iter50);

    gtk_tree_store_append (store, &iter, 0);
    gtk_tree_store_set (store, &iter, 0, "apples", -1);

    gtk_widget_show_all (window);
    gtk_main ();

    return 0;
}