]> Pileus Git - ~andy/gtk/blobdiff - gtk/gtktreemodel.c
set alternative button order on the password dialog.
[~andy/gtk] / gtk / gtktreemodel.c
index 982639b3037f87ac40f48101416ef0f8f5f2ff79..d6fe4c22079d1dff1cabfbeaee3e8262dc7ad236 100644 (file)
  * Boston, MA 02111-1307, USA.
  */
 
+#include <config.h>
 #include <stdlib.h>
-#include <stdio.h>
 #include <string.h>
 #include <glib.h>
+#include <glib/gprintf.h>
 #include <gobject/gvaluecollector.h>
 #include "gtktreemodel.h"
 #include "gtktreeview.h"
 #include "gtktreeprivate.h"
-#include "gtksignal.h"
+#include "gtkmarshalers.h"
+#include "gtkintl.h"
+#include "gtkalias.h"
 
 
+#define INITIALIZE_TREE_ITER(Iter) \
+    G_STMT_START{ \
+      (Iter)->stamp = 0; \
+      (Iter)->user_data  = NULL; \
+      (Iter)->user_data2 = NULL; \
+      (Iter)->user_data3 = NULL; \
+    }G_STMT_END
+
+#define ROW_REF_DATA_STRING "gtk-tree-row-refs"
+
+enum {
+  ROW_CHANGED,
+  ROW_INSERTED,
+  ROW_HAS_CHILD_TOGGLED,
+  ROW_DELETED,
+  ROWS_REORDERED,
+  LAST_SIGNAL
+};
+
+static guint tree_model_signals[LAST_SIGNAL] = { 0 };
+
 struct _GtkTreePath
 {
   gint depth;
   gint *indices;
 };
 
-static void gtk_tree_model_base_init (gpointer g_class);
+typedef struct
+{
+  GSList *list;
+} RowRefList;
 
+static void      gtk_tree_model_base_init   (gpointer           g_class);
+
+/* custom closures */
+static void      row_inserted_marshal       (GClosure          *closure,
+                                             GValue /* out */  *return_value,
+                                             guint              n_param_value,
+                                             const GValue      *param_values,
+                                             gpointer           invocation_hint,
+                                             gpointer           marshal_data);
+static void      row_deleted_marshal        (GClosure          *closure,
+                                             GValue /* out */  *return_value,
+                                             guint              n_param_value,
+                                             const GValue      *param_values,
+                                             gpointer           invocation_hint,
+                                             gpointer           marshal_data);
+static void      rows_reordered_marshal     (GClosure          *closure,
+                                             GValue /* out */  *return_value,
+                                             guint              n_param_value,
+                                             const GValue      *param_values,
+                                             gpointer           invocation_hint,
+                                             gpointer           marshal_data);
+
+static void      gtk_tree_row_ref_inserted  (RowRefList        *refs,
+                                             GtkTreePath       *path,
+                                             GtkTreeIter       *iter);
+static void      gtk_tree_row_ref_deleted   (RowRefList        *refs,
+                                             GtkTreePath       *path);
+static void      gtk_tree_row_ref_reordered (RowRefList        *refs,
+                                             GtkTreePath       *path,
+                                             GtkTreeIter       *iter,
+                                             gint              *new_order);
 
-GtkType
+GType
 gtk_tree_model_get_type (void)
 {
-  static GtkType tree_model_type = 0;
+  static GType tree_model_type = 0;
 
   if (! tree_model_type)
     {
-      static const GTypeInfo tree_model_info =
+      const GTypeInfo tree_model_info =
       {
         sizeof (GtkTreeModelIface), /* class_size */
        gtk_tree_model_base_init,   /* base_init */
@@ -57,7 +115,10 @@ gtk_tree_model_get_type (void)
        NULL
       };
 
-      tree_model_type = g_type_register_static (G_TYPE_INTERFACE, "GtkTreeModel", &tree_model_info, 0);
+      tree_model_type =
+       g_type_register_static (G_TYPE_INTERFACE, I_("GtkTreeModel"),
+                               &tree_model_info, 0);
+
       g_type_interface_add_prerequisite (tree_model_type, G_TYPE_OBJECT);
     }
 
@@ -68,64 +129,258 @@ static void
 gtk_tree_model_base_init (gpointer g_class)
 {
   static gboolean initialized = FALSE;
+  GClosure *closure;
 
   if (! initialized)
     {
-      g_signal_newc ("range_changed",
-                    GTK_TYPE_TREE_MODEL,
-                    G_SIGNAL_RUN_LAST,
-                    G_STRUCT_OFFSET (GtkTreeModelIface, range_changed),
-                    NULL, NULL,
-                    gtk_marshal_VOID__BOXED_BOXED_BOXED_BOXED,
-                    G_TYPE_NONE, 4,
-                    GTK_TYPE_TREE_PATH,
-                    GTK_TYPE_TREE_ITER,
-                    GTK_TYPE_TREE_PATH,
-                    GTK_TYPE_TREE_ITER);
-      g_signal_newc ("inserted",
-                    GTK_TYPE_TREE_MODEL,
-                    G_SIGNAL_RUN_LAST,
-                    G_STRUCT_OFFSET (GtkTreeModelIface, inserted),
-                    NULL, NULL,
-                    gtk_marshal_VOID__BOXED_BOXED,
-                    G_TYPE_NONE, 2,
-                    GTK_TYPE_TREE_PATH,
-                    GTK_TYPE_TREE_ITER);
-      g_signal_newc ("has_child_toggled",
-                    GTK_TYPE_TREE_MODEL,
-                    G_SIGNAL_RUN_LAST,
-                    G_STRUCT_OFFSET (GtkTreeModelIface, has_child_toggled),
-                    NULL, NULL,
-                    gtk_marshal_VOID__BOXED_BOXED,
-                    G_TYPE_NONE, 2,
-                    GTK_TYPE_TREE_PATH,
-                    GTK_TYPE_TREE_ITER);
-      g_signal_newc ("deleted",
-                    GTK_TYPE_TREE_MODEL,
-                    G_SIGNAL_RUN_LAST,
-                    G_STRUCT_OFFSET (GtkTreeModelIface, deleted),
-                    NULL, NULL,
-                    gtk_marshal_VOID__BOXED,
-                    G_TYPE_NONE, 1,
-                    GTK_TYPE_TREE_PATH);
-      g_signal_newc ("reordered",
-                    GTK_TYPE_TREE_MODEL,
-                    G_SIGNAL_RUN_LAST,
-                    G_STRUCT_OFFSET (GtkTreeModelIface, reordered),
-                    NULL, NULL,
-                    gtk_marshal_VOID__BOXED_BOXED_POINTER,
-                    G_TYPE_NONE, 3,
-                    GTK_TYPE_TREE_PATH,
-                    GTK_TYPE_TREE_ITER,
-                    G_TYPE_POINTER);
+      GType row_inserted_params[2];
+      GType row_deleted_params[1];
+      GType rows_reordered_params[3];
+
+      row_inserted_params[0] = GTK_TYPE_TREE_PATH | G_SIGNAL_TYPE_STATIC_SCOPE;
+      row_inserted_params[1] = GTK_TYPE_TREE_ITER;
+
+      row_deleted_params[0] = GTK_TYPE_TREE_PATH | G_SIGNAL_TYPE_STATIC_SCOPE;
+
+      rows_reordered_params[0] = GTK_TYPE_TREE_PATH | G_SIGNAL_TYPE_STATIC_SCOPE;
+      rows_reordered_params[1] = GTK_TYPE_TREE_ITER;
+      rows_reordered_params[2] = G_TYPE_POINTER;
+
+      /**
+       * GtkTreeModel::row-changed:
+       * @tree_model: the #GtkTreeModel on which the signal is emitted
+       * @path: a #GtkTreePath identifying the changed row
+       * @iter: a valid #GtkTreeIter pointing to the changed row
+       *
+       * This signal is emitted when a row in the model has changed.
+       */
+      tree_model_signals[ROW_CHANGED] =
+        g_signal_new (I_("row_changed"),
+                      GTK_TYPE_TREE_MODEL,
+                      G_SIGNAL_RUN_LAST, 
+                      G_STRUCT_OFFSET (GtkTreeModelIface, row_changed),
+                      NULL, NULL,
+                      _gtk_marshal_VOID__BOXED_BOXED,
+                      G_TYPE_NONE, 2,
+                      GTK_TYPE_TREE_PATH | G_SIGNAL_TYPE_STATIC_SCOPE,
+                      GTK_TYPE_TREE_ITER);
+
+      /* We need to get notification about structure changes
+       * to update row references., so instead of using the
+       * standard g_signal_new() with an offset into our interface
+       * structure, we use a customs closures for the class
+       * closures (default handlers) that first update row references
+       * and then calls the function from the interface structure.
+       *
+       * The reason we don't simply update the row references from
+       * the wrapper functions (gtk_tree_model_row_inserted(), etc.)
+       * is to keep proper ordering with respect to signal handlers
+       * connected normally and after.
+       */
+
+      /**
+       * GtkTreeModel::row-inserted:
+       * @tree_model: the #GtkTreeModel on which the signal is emitted
+       * @path: a #GtkTreePath identifying the new row
+       * @iter: a valid #GtkTreeIter pointing to the new row
+       *
+       * This signal is emitted when a new row has been inserted in the model.
+       *
+       * Note that the row may still be empty at this point, since
+       * it is a common pattern to first insert an empty row, and 
+       * then fill it with the desired values.
+       */
+      closure = g_closure_new_simple (sizeof (GClosure), NULL);
+      g_closure_set_marshal (closure, row_inserted_marshal);
+      tree_model_signals[ROW_INSERTED] =
+        g_signal_newv (I_("row_inserted"),
+                       GTK_TYPE_TREE_MODEL,
+                       G_SIGNAL_RUN_FIRST,
+                       closure,
+                       NULL, NULL,
+                       _gtk_marshal_VOID__BOXED_BOXED,
+                       G_TYPE_NONE, 2,
+                       row_inserted_params);
+
+      /**
+       * GtkTreeModel::row-has-child-toggled:
+       * @tree_model: the #GtkTreeModel on which the signal is emitted
+       * @path: a #GtkTreePath identifying the row
+       * @iter: a valid #GtkTreeIter pointing to the row
+       *
+       * This signal is emitted when a row has gotten the first child row or lost
+       * its last child row.
+       */
+      tree_model_signals[ROW_HAS_CHILD_TOGGLED] =
+        g_signal_new (I_("row_has_child_toggled"),
+                      GTK_TYPE_TREE_MODEL,
+                      G_SIGNAL_RUN_LAST,
+                      G_STRUCT_OFFSET (GtkTreeModelIface, row_has_child_toggled),
+                      NULL, NULL,
+                      _gtk_marshal_VOID__BOXED_BOXED,
+                      G_TYPE_NONE, 2,
+                      GTK_TYPE_TREE_PATH | G_SIGNAL_TYPE_STATIC_SCOPE,
+                      GTK_TYPE_TREE_ITER);
+
+      /**
+       * GtkTreeModel::row-deleted:
+       * @tree_model: the #GtkTreeModel on which the signal is emitted
+       * @path: a #GtkTreePath identifying the row
+       *
+       * This signal is emitted when a row has been deleted.
+       *
+       * Note that no iterator is passed to the signal handler,
+       * since the row is already deleted.
+       *
+       * Implementations of GtkTreeModel must emit row-deleted 
+       * <emphasis>before</emphasis> removing the node from its
+       * internal data structures.  This is because models and 
+       * views which access and monitor this model might have
+       * references on the node which need to be released in the
+       * row-deleted handler.
+       */
+      closure = g_closure_new_simple (sizeof (GClosure), NULL);
+      g_closure_set_marshal (closure, row_deleted_marshal);
+      tree_model_signals[ROW_DELETED] =
+        g_signal_newv (I_("row_deleted"),
+                       GTK_TYPE_TREE_MODEL,
+                       G_SIGNAL_RUN_FIRST,
+                       closure,
+                       NULL, NULL,
+                       _gtk_marshal_VOID__BOXED,
+                       G_TYPE_NONE, 1,
+                       row_deleted_params);
+
+      /**
+       * GtkTreeModel::rows-reordered:
+       * @tree_model: the #GtkTreeModel on which the signal is emitted
+       * @path: a #GtkTreePath identifying the tree node whose children
+       *        have been reordered
+       * @iter: a valid #GtkTreeIter pointing to the node whose 
+       *
+       * This signal is emitted when the children of a node in the #GtkTreeModel
+       * have been reordered. 
+       *
+       * Note that this signal is <emphasis>not</emphasis> emitted
+       * when rows are reordered by DND, since this is implemented
+       * by removing and then reinserting the row.
+       */
+      closure = g_closure_new_simple (sizeof (GClosure), NULL);
+      g_closure_set_marshal (closure, rows_reordered_marshal);
+      tree_model_signals[ROWS_REORDERED] =
+        g_signal_newv (I_("rows_reordered"),
+                       GTK_TYPE_TREE_MODEL,
+                       G_SIGNAL_RUN_FIRST,
+                       closure,
+                       NULL, NULL,
+                       _gtk_marshal_VOID__BOXED_BOXED_POINTER,
+                       G_TYPE_NONE, 3,
+                       rows_reordered_params);
       initialized = TRUE;
     }
 }
 
+static void
+row_inserted_marshal (GClosure          *closure,
+                      GValue /* out */  *return_value,
+                      guint              n_param_values,
+                      const GValue      *param_values,
+                      gpointer           invocation_hint,
+                      gpointer           marshal_data)
+{
+  GtkTreeModelIface *iface;
+
+  void (* row_inserted_callback) (GtkTreeModel *tree_model,
+                                  GtkTreePath *path,
+                                  GtkTreeIter *iter) = NULL;
+            
+  GObject *model = g_value_get_object (param_values + 0);
+  GtkTreePath *path = (GtkTreePath *)g_value_get_boxed (param_values + 1);
+  GtkTreeIter *iter = (GtkTreeIter *)g_value_get_boxed (param_values + 2);
+
+  /* first, we need to update internal row references */
+  gtk_tree_row_ref_inserted ((RowRefList *)g_object_get_data (model, ROW_REF_DATA_STRING),
+                             path, iter);
+                               
+  /* fetch the interface ->row_inserted implementation */
+  iface = GTK_TREE_MODEL_GET_IFACE (model);
+  row_inserted_callback = G_STRUCT_MEMBER (gpointer, iface,
+                              G_STRUCT_OFFSET (GtkTreeModelIface,
+                                               row_inserted));
+
+  /* Call that default signal handler, it if has been set */                                                         
+  if (row_inserted_callback)
+    row_inserted_callback (GTK_TREE_MODEL (model), path, iter);
+}
+
+static void
+row_deleted_marshal (GClosure          *closure,
+                     GValue /* out */  *return_value,
+                     guint              n_param_values,
+                     const GValue      *param_values,
+                     gpointer           invocation_hint,
+                     gpointer           marshal_data)
+{
+  GtkTreeModelIface *iface;
+  void (* row_deleted_callback) (GtkTreeModel *tree_model,
+                                 GtkTreePath  *path) = NULL;                                 
+  GObject *model = g_value_get_object (param_values + 0);
+  GtkTreePath *path = (GtkTreePath *)g_value_get_boxed (param_values + 1);
+
+  /* first, we need to update internal row references */
+  gtk_tree_row_ref_deleted ((RowRefList *)g_object_get_data (model, ROW_REF_DATA_STRING),
+                            path);
+
+  /* fetch the interface ->row_deleted implementation */
+  iface = GTK_TREE_MODEL_GET_IFACE (model);
+  row_deleted_callback = G_STRUCT_MEMBER (gpointer, iface,
+                              G_STRUCT_OFFSET (GtkTreeModelIface,
+                                               row_deleted));
+                              
+  /* Call that default signal handler, it if has been set */
+  if (row_deleted_callback)
+    row_deleted_callback (GTK_TREE_MODEL (model), path);
+}
+
+static void
+rows_reordered_marshal (GClosure          *closure,
+                        GValue /* out */  *return_value,
+                        guint              n_param_values,
+                        const GValue      *param_values,
+                        gpointer           invocation_hint,
+                        gpointer           marshal_data)
+{
+  GtkTreeModelIface *iface;
+  void (* rows_reordered_callback) (GtkTreeModel *tree_model,
+                                    GtkTreePath  *path,
+                                    GtkTreeIter  *iter,
+                                    gint         *new_order);
+            
+  GObject *model = g_value_get_object (param_values + 0);
+  GtkTreePath *path = (GtkTreePath *)g_value_get_boxed (param_values + 1);
+  GtkTreeIter *iter = (GtkTreeIter *)g_value_get_boxed (param_values + 2);
+  gint *new_order = (gint *)g_value_get_pointer (param_values + 3);
+  
+  /* first, we need to update internal row references */
+  gtk_tree_row_ref_reordered ((RowRefList *)g_object_get_data (model, ROW_REF_DATA_STRING),
+                              path, iter, new_order);
+
+  /* fetch the interface ->rows_reordered implementation */
+  iface = GTK_TREE_MODEL_GET_IFACE (model);
+  rows_reordered_callback = G_STRUCT_MEMBER (gpointer, iface,
+                              G_STRUCT_OFFSET (GtkTreeModelIface,
+                                               rows_reordered));
+
+  /* Call that default signal handler, it if has been set */
+  if (rows_reordered_callback)
+    rows_reordered_callback (GTK_TREE_MODEL (model), path, iter, new_order);
+}
+
 /**
  * gtk_tree_path_new:
  *
- * Creates a new #GtkTreePath.
+ * Creates a new #GtkTreePath.  This structure refers to a row.
  *
  * Return value: A newly created #GtkTreePath.
  **/
@@ -134,7 +389,7 @@ GtkTreePath *
 gtk_tree_path_new (void)
 {
   GtkTreePath *retval;
-  retval = (GtkTreePath *) g_new (GtkTreePath, 1);
+  retval = g_slice_new (GtkTreePath);
   retval->depth = 0;
   retval->indices = NULL;
 
@@ -145,39 +400,88 @@ gtk_tree_path_new (void)
  * gtk_tree_path_new_from_string:
  * @path: The string representation of a path.
  *
- * Creates a new #GtkTreePath initialized to @path.  @path is expected
- * to be a colon separated list of numbers.  For example, the string
- * "10:4:0" would create a path of depth 3 pointing to the 11th child
- * of the root node, the 5th child of that 11th child, and the 1st
- * child of that 5th child.
+ * Creates a new #GtkTreePath initialized to @path.  @path is expected to be a
+ * colon separated list of numbers.  For example, the string "10:4:0" would
+ * create a path of depth 3 pointing to the 11th child of the root node, the 5th
+ * child of that 11th child, and the 1st child of that 5th child.  If an invalid
+ * path string is passed in, %NULL is returned.
  *
- * Return value: A newly created #GtkTreePath.
+ * Return value: A newly-created #GtkTreePath, or %NULL
  **/
 GtkTreePath *
-gtk_tree_path_new_from_string (gchar *path)
+gtk_tree_path_new_from_string (const gchar *path)
 {
   GtkTreePath *retval;
+  const gchar *orig_path = path;
   gchar *ptr;
   gint i;
 
-  g_return_val_if_fail (path != NULL, gtk_tree_path_new ());
+  g_return_val_if_fail (path != NULL, NULL);
+  g_return_val_if_fail (*path != '\000', NULL);
 
   retval = gtk_tree_path_new ();
 
   while (1)
     {
       i = strtol (path, &ptr, 10);
+      if (i < 0)
+       {
+         g_warning (G_STRLOC ": Negative numbers in path %s passed to gtk_tree_path_new_from_string", orig_path);
+         gtk_tree_path_free (retval);
+         return NULL;
+       }
+
       gtk_tree_path_append_index (retval, i);
 
       if (*ptr == '\000')
        break;
-      /* FIXME: should we error out if this is not a ':', or should we be tolerant? */
+      if (ptr == path || *ptr != ':')
+       {
+         g_warning (G_STRLOC ": Invalid path %s passed to gtk_tree_path_new_from_string", orig_path);
+         gtk_tree_path_free (retval);
+         return NULL;
+       }
       path = ptr + 1;
     }
 
   return retval;
 }
 
+/**
+ * gtk_tree_path_new_from_indices:
+ * @first_index: first integer
+ * @varargs: list of integers terminated by -1
+ *
+ * Creates a new path with @first_index and @varargs as indices.
+ *
+ * Return value: A newly created #GtkTreePath.
+ *
+ * Since: 2.2
+ **/
+GtkTreePath *
+gtk_tree_path_new_from_indices (gint first_index,
+                               ...)
+{
+  int arg;
+  va_list args;
+  GtkTreePath *path;
+
+  path = gtk_tree_path_new ();
+
+  va_start (args, first_index);
+  arg = first_index;
+
+  while (arg != -1)
+    {
+      gtk_tree_path_append_index (path, arg);
+      arg = va_arg (args, gint);
+    }
+
+  va_end (args);
+
+  return path;
+}
+
 /**
  * gtk_tree_path_to_string:
  * @path: A #GtkTreePath
@@ -185,25 +489,29 @@ gtk_tree_path_new_from_string (gchar *path)
  * Generates a string representation of the path.  This string is a ':'
  * separated list of numbers.  For example, "4:10:0:3" would be an acceptable return value for this string.
  *
- * Return value: A newly allocated string.  Must be freed with #g_free.
+ * Return value: A newly-allocated string.  Must be freed with g_free().
  **/
 gchar *
 gtk_tree_path_to_string (GtkTreePath *path)
 {
-  gchar *retval, *ptr;
-  gint i;
+  gchar *retval, *ptr, *end;
+  gint i, n;
+
+  g_return_val_if_fail (path != NULL, NULL);
 
   if (path->depth == 0)
     return NULL;
 
-  ptr = retval = (gchar *) g_new0 (char *, path->depth*8);
-  sprintf (retval, "%d", path->indices[0]);
-  while (*ptr != '\000')
+  n = path->depth * 12;
+  ptr = retval = g_new0 (gchar, n);
+  end = ptr + n;
+  g_snprintf (retval, end - ptr, "%d", path->indices[0]);
+  while (*ptr != '\000') 
     ptr++;
 
   for (i = 1; i < path->depth; i++)
     {
-      sprintf (ptr, ":%d", path->indices[i]);
+      g_snprintf (ptr, end - ptr, ":%d", path->indices[i]);
       while (*ptr != '\000')
        ptr++;
     }
@@ -212,15 +520,14 @@ gtk_tree_path_to_string (GtkTreePath *path)
 }
 
 /**
- * gtk_tree_path_new_root:
+ * gtk_tree_path_new_first:
  *
- * Creates a new root #GtkTreePath.  The string representation of this path is
- * "0"
+ * Creates a new #GtkTreePath.  The string representation of this path is "0"
  *
  * Return value: A new #GtkTreePath.
  **/
 GtkTreePath *
-gtk_tree_path_new_root (void)
+gtk_tree_path_new_first (void)
 {
   GtkTreePath *retval;
 
@@ -233,7 +540,7 @@ gtk_tree_path_new_root (void)
 /**
  * gtk_tree_path_append_index:
  * @path: A #GtkTreePath.
- * @index: The index.
+ * @index_: The index.
  *
  * Appends a new index to a path.  As a result, the depth of the path is
  * increased.
@@ -253,7 +560,7 @@ gtk_tree_path_append_index (GtkTreePath *path,
 /**
  * gtk_tree_path_prepend_index:
  * @path: A #GtkTreePath.
- * @index: The index.
+ * @index_: The index.
  *
  * Prepends a new index to a path.  As a result, the depth of the path is
  * increased.
@@ -262,7 +569,11 @@ void
 gtk_tree_path_prepend_index (GtkTreePath *path,
                             gint       index)
 {
-  gint *new_indices = g_new (gint, ++path->depth);
+  gint *new_indices;
+
+  (path->depth)++;
+  new_indices = g_new (gint, path->depth);
+
   if (path->indices == NULL)
     {
       path->indices = new_indices;
@@ -296,9 +607,9 @@ gtk_tree_path_get_depth (GtkTreePath *path)
  * @path: A #GtkTreePath.
  *
  * Returns the current indices of @path.  This is an array of integers, each
- * representing a node in a tree.
+ * representing a node in a tree.  This value should not be freed.
  *
- * Return value: The current indices, or NULL.
+ * Return value: The current indices, or %NULL.
  **/
 gint *
 gtk_tree_path_get_indices (GtkTreePath *path)
@@ -317,10 +628,11 @@ gtk_tree_path_get_indices (GtkTreePath *path)
 void
 gtk_tree_path_free (GtkTreePath *path)
 {
-  g_return_if_fail (path != NULL);
+  if (!path)
+    return;
 
   g_free (path->indices);
-  g_free (path);
+  g_slice_free (GtkTreePath, path);
 }
 
 /**
@@ -332,26 +644,39 @@ gtk_tree_path_free (GtkTreePath *path)
  * Return value: A new #GtkTreePath.
  **/
 GtkTreePath *
-gtk_tree_path_copy (GtkTreePath *path)
+gtk_tree_path_copy (const GtkTreePath *path)
 {
   GtkTreePath *retval;
 
   g_return_val_if_fail (path != NULL, NULL);
 
-  retval = g_new (GtkTreePath, 1);
+  retval = g_slice_new (GtkTreePath);
   retval->depth = path->depth;
   retval->indices = g_new (gint, path->depth);
   memcpy (retval->indices, path->indices, path->depth * sizeof (gint));
   return retval;
 }
 
+GType
+gtk_tree_path_get_type (void)
+{
+  static GType our_type = 0;
+  
+  if (our_type == 0)
+    our_type = g_boxed_type_register_static (I_("GtkTreePath"),
+                                            (GBoxedCopyFunc) gtk_tree_path_copy,
+                                            (GBoxedFreeFunc) gtk_tree_path_free);
+
+  return our_type;
+}
+
 /**
  * gtk_tree_path_compare:
  * @a: A #GtkTreePath.
  * @b: A #GtkTreePath to compare with.
  *
- * Compares two paths.  If @a appears before @b in a tree, then 1, is returned.
- * If @b appears before @a, then -1 is returned.  If the two nodes are equal,
+ * Compares two paths.  If @a appears before @b in a tree, then -1 is returned.
+ * If @b appears before @a, then 1 is returned.  If the two nodes are equal,
  * then 0 is returned.
  *
  * Return value: The relative positions of @a and @b
@@ -371,12 +696,12 @@ gtk_tree_path_compare (const GtkTreePath *a,
     {
       if (a->indices[p] == b->indices[q])
        continue;
-      return (a->indices[p] < b->indices[q]?1:-1);
+      return (a->indices[p] < b->indices[q]?-1:1);
     }
   while (++p < a->depth && ++q < b->depth);
   if (a->depth == b->depth)
     return 0;
-  return (a->depth < b->depth?1:-1);
+  return (a->depth < b->depth?-1:1);
 }
 
 /**
@@ -384,7 +709,7 @@ gtk_tree_path_compare (const GtkTreePath *a,
  * @path: a #GtkTreePath
  * @descendant: another #GtkTreePath
  *
- *
+ * Returns %TRUE if @descendant is a descendant of @path.
  *
  * Return value: %TRUE if @descendant is contained inside @path
  **/
@@ -417,7 +742,7 @@ gtk_tree_path_is_ancestor (GtkTreePath *path,
  * @path: a #GtkTreePath
  * @ancestor: another #GtkTreePath
  *
- *
+ * Returns %TRUE if @path is a descendant of @ancestor.
  *
  * Return value: %TRUE if @ancestor contains @path somewhere below it
  **/
@@ -465,15 +790,19 @@ gtk_tree_path_next (GtkTreePath *path)
  * gtk_tree_path_prev:
  * @path: A #GtkTreePath.
  *
- * Moves the @path to point to the previous node at the current depth, if it exists.
+ * Moves the @path to point to the previous node at the current depth, 
+ * if it exists.
  *
- * Return value: TRUE if @path has a previous node, and the move was made.
+ * Return value: %TRUE if @path has a previous node, and the move was made.
  **/
 gboolean
 gtk_tree_path_prev (GtkTreePath *path)
 {
   g_return_val_if_fail (path != NULL, FALSE);
 
+  if (path->depth == 0)
+    return FALSE;
+
   if (path->indices[path->depth - 1] == 0)
     return FALSE;
 
@@ -486,16 +815,16 @@ gtk_tree_path_prev (GtkTreePath *path)
  * gtk_tree_path_up:
  * @path: A #GtkTreePath.
  *
- * Moves the @path to point to it's parent node, if it has a parent.
+ * Moves the @path to point to its parent node, if it has a parent.
  *
- * Return value: TRUE if @path has a parent, and the move was made.
+ * Return value: %TRUE if @path has a parent, and the move was made.
  **/
 gboolean
 gtk_tree_path_up (GtkTreePath *path)
 {
   g_return_val_if_fail (path != NULL, FALSE);
 
-  if (path->depth == 1)
+  if (path->depth == 0)
     return FALSE;
 
   path->depth--;
@@ -523,10 +852,10 @@ gtk_tree_path_down (GtkTreePath *path)
  *
  * Creates a dynamically allocated tree iterator as a copy of @iter.  This
  * function is not intended for use in applications, because you can just copy
- * the structs by value (GtkTreeIter new_iter = iter;).  You
+ * the structs by value (<literal>GtkTreeIter new_iter = iter;</literal>).  You
  * must free this iter with gtk_tree_iter_free ().
  *
- * Return value: a newly allocated copy of @iter.
+ * Return value: a newly-allocated copy of @iter.
  **/
 GtkTreeIter *
 gtk_tree_iter_copy (GtkTreeIter *iter)
@@ -535,7 +864,7 @@ gtk_tree_iter_copy (GtkTreeIter *iter)
 
   g_return_val_if_fail (iter != NULL, NULL);
 
-  retval = g_new (GtkTreeIter, 1);
+  retval = g_slice_new (GtkTreeIter);
   *retval = *iter;
 
   return retval;
@@ -545,7 +874,7 @@ gtk_tree_iter_copy (GtkTreeIter *iter)
  * gtk_tree_iter_free:
  * @iter: A dynamically allocated tree iterator.
  *
- * Free an iterator that has been allocated on the heap.  This function is
+ * Frees an iterator that has been allocated on the heap.  This function is
  * mainly used for language bindings.
  **/
 void
@@ -553,7 +882,20 @@ gtk_tree_iter_free (GtkTreeIter *iter)
 {
   g_return_if_fail (iter != NULL);
 
-  g_free (iter);
+  g_slice_free (GtkTreeIter, iter);
+}
+
+GType
+gtk_tree_iter_get_type (void)
+{
+  static GType our_type = 0;
+  
+  if (our_type == 0)
+    our_type = g_boxed_type_register_static (I_("GtkTreeIter"),
+                                            (GBoxedCopyFunc) gtk_tree_iter_copy,
+                                            (GBoxedFreeFunc) gtk_tree_iter_free);
+
+  return our_type;
 }
 
 /**
@@ -561,19 +903,21 @@ gtk_tree_iter_free (GtkTreeIter *iter)
  * @tree_model: A #GtkTreeModel.
  *
  * Returns a set of flags supported by this interface.  The flags are a bitwise
- * combination of #GtkTreeModelFlags.  It is expected that the flags supported
- * do not change for an interface.
+ * combination of #GtkTreeModelFlags.  The flags supported should not change
+ * during the lifecycle of the @tree_model.
  *
  * Return value: The flags supported by this interface.
  **/
 GtkTreeModelFlags
 gtk_tree_model_get_flags (GtkTreeModel *tree_model)
 {
-  g_return_val_if_fail (tree_model != NULL, 0);
+  GtkTreeModelIface *iface;
+
   g_return_val_if_fail (GTK_IS_TREE_MODEL (tree_model), 0);
 
-  if (GTK_TREE_MODEL_GET_IFACE (tree_model)->get_flags)
-    return (GTK_TREE_MODEL_GET_IFACE (tree_model)->get_flags) (tree_model);
+  iface = GTK_TREE_MODEL_GET_IFACE (tree_model);
+  if (iface->get_flags)
+    return (* iface->get_flags) (tree_model);
 
   return 0;
 }
@@ -582,24 +926,26 @@ gtk_tree_model_get_flags (GtkTreeModel *tree_model)
  * gtk_tree_model_get_n_columns:
  * @tree_model: A #GtkTreeModel.
  *
- * Returns the number of columns supported by the #tree_model
+ * Returns the number of columns supported by @tree_model.
  *
  * Return value: The number of columns.
  **/
 gint
 gtk_tree_model_get_n_columns (GtkTreeModel *tree_model)
 {
-  g_return_val_if_fail (tree_model != NULL, 0);
+  GtkTreeModelIface *iface;
   g_return_val_if_fail (GTK_IS_TREE_MODEL (tree_model), 0);
-  g_return_val_if_fail (GTK_TREE_MODEL_GET_IFACE (tree_model)->get_n_columns != NULL, 0);
 
-  return (* GTK_TREE_MODEL_GET_IFACE (tree_model)->get_n_columns) (tree_model);
+  iface = GTK_TREE_MODEL_GET_IFACE (tree_model);
+  g_return_val_if_fail (iface->get_n_columns != NULL, 0);
+
+  return (* iface->get_n_columns) (tree_model);
 }
 
 /**
  * gtk_tree_model_get_column_type:
  * @tree_model: A #GtkTreeModel.
- * @index: The column index.
+ * @index_: The column index.
  *
  * Returns the type of the column.
  *
@@ -609,12 +955,15 @@ GType
 gtk_tree_model_get_column_type (GtkTreeModel *tree_model,
                                gint          index)
 {
-  g_return_val_if_fail (tree_model != NULL, G_TYPE_INVALID);
+  GtkTreeModelIface *iface;
+
   g_return_val_if_fail (GTK_IS_TREE_MODEL (tree_model), G_TYPE_INVALID);
-  g_return_val_if_fail (GTK_TREE_MODEL_GET_IFACE (tree_model)->get_column_type != NULL, G_TYPE_INVALID);
+
+  iface = GTK_TREE_MODEL_GET_IFACE (tree_model);
+  g_return_val_if_fail (iface->get_column_type != NULL, G_TYPE_INVALID);
   g_return_val_if_fail (index >= 0, G_TYPE_INVALID);
 
-  return (* GTK_TREE_MODEL_GET_IFACE (tree_model)->get_column_type) (tree_model, index);
+  return (* iface->get_column_type) (tree_model, index);
 }
 
 /**
@@ -623,72 +972,118 @@ gtk_tree_model_get_column_type (GtkTreeModel *tree_model,
  * @iter: The uninitialized #GtkTreeIter.
  * @path: The #GtkTreePath.
  *
- * Sets @iter to a valid iterator pointing to @path.  If the model does not
- * provide an implementation of this function, it is implemented in terms of
- * @gtk_tree_model_iter_nth_child.
+ * Sets @iter to a valid iterator pointing to @path.
  *
- * Return value: TRUE, if @iter was set.
+ * Return value: %TRUE, if @iter was set.
  **/
 gboolean
 gtk_tree_model_get_iter (GtkTreeModel *tree_model,
                         GtkTreeIter  *iter,
                         GtkTreePath  *path)
 {
-  GtkTreeIter parent;
-  gint *indices;
-  gint depth, i;
+  GtkTreeModelIface *iface;
 
-  g_return_val_if_fail (tree_model != NULL, FALSE);
+  g_return_val_if_fail (GTK_IS_TREE_MODEL (tree_model), FALSE);
   g_return_val_if_fail (iter != NULL, FALSE);
   g_return_val_if_fail (path != NULL, FALSE);
-  g_return_val_if_fail (GTK_IS_TREE_MODEL (tree_model), FALSE);
 
-  if (GTK_TREE_MODEL_GET_IFACE (tree_model)->get_iter != NULL)
-    return (* GTK_TREE_MODEL_GET_IFACE (tree_model)->get_iter) (tree_model, iter, path);
+  iface = GTK_TREE_MODEL_GET_IFACE (tree_model);
+  g_return_val_if_fail (iface->get_iter != NULL, FALSE);
+  g_return_val_if_fail (path->depth > 0, FALSE);
 
-  indices = gtk_tree_path_get_indices (path);
-  depth = gtk_tree_path_get_depth (path);
+  INITIALIZE_TREE_ITER (iter);
 
-  g_return_val_if_fail (depth > 0, FALSE);
+  return (* iface->get_iter) (tree_model, iter, path);
+}
 
-  if (! gtk_tree_model_iter_nth_child (tree_model, iter, NULL, indices[0]))
-    return FALSE;
+/**
+ * gtk_tree_model_get_iter_from_string:
+ * @tree_model: A #GtkTreeModel.
+ * @iter: An uninitialized #GtkTreeIter.
+ * @path_string: A string representation of a #GtkTreePath.
+ *
+ * Sets @iter to a valid iterator pointing to @path_string, if it
+ * exists. Otherwise, @iter is left invalid and %FALSE is returned.
+ *
+ * Return value: %TRUE, if @iter was set.
+ **/
+gboolean
+gtk_tree_model_get_iter_from_string (GtkTreeModel *tree_model,
+                                    GtkTreeIter  *iter,
+                                    const gchar  *path_string)
+{
+  gboolean retval;
+  GtkTreePath *path;
 
-  for (i = 1; i < depth; i++)
-    {
-      parent = *iter;
-      if (! gtk_tree_model_iter_nth_child (tree_model, iter, &parent, indices[i]))
-       return FALSE;
-    }
+  g_return_val_if_fail (GTK_IS_TREE_MODEL (tree_model), FALSE);
+  g_return_val_if_fail (iter != NULL, FALSE);
+  g_return_val_if_fail (path_string != NULL, FALSE);
+  
+  path = gtk_tree_path_new_from_string (path_string);
+  
+  g_return_val_if_fail (path != NULL, FALSE);
 
-  return TRUE;
+  retval = gtk_tree_model_get_iter (tree_model, iter, path);
+  gtk_tree_path_free (path);
+  
+  return retval;
 }
 
 /**
- * gtk_tree_model_get_first:
- * @tree_model: a #GtkTreeModel
- * @iter: iterator to initialize
+ * gtk_tree_model_get_string_from_iter:
+ * @tree_model: A #GtkTreeModel.
+ * @iter: An #GtkTreeIter.
+ *
+ * Generates a string representation of the iter. This string is a ':'
+ * separated list of numbers. For example, "4:10:0:3" would be an
+ * acceptable return value for this string.
  *
- * Initialized @iter with the first iterator in the tree (the one at the
- * root path) and returns %TRUE, or returns %FALSE if there are no
- * iterable locations in the model (i.e. the tree is empty).
+ * Return value: A newly-allocated string. Must be freed with g_free().
  *
- * Return value: %TRUE if @iter was initialized
+ * Since: 2.2
+ **/
+gchar *
+gtk_tree_model_get_string_from_iter (GtkTreeModel *tree_model,
+                                     GtkTreeIter  *iter)
+{
+  GtkTreePath *path;
+  gchar *ret;
+
+  g_return_val_if_fail (GTK_IS_TREE_MODEL (tree_model), NULL);
+  g_return_val_if_fail (iter != NULL, NULL);
+
+  path = gtk_tree_model_get_path (tree_model, iter);
+
+  g_return_val_if_fail (path != NULL, NULL);
+
+  ret = gtk_tree_path_to_string (path);
+  gtk_tree_path_free (path);
+
+  return ret;
+}
+
+/**
+ * gtk_tree_model_get_iter_first:
+ * @tree_model: A #GtkTreeModel.
+ * @iter: The uninitialized #GtkTreeIter.
+ * 
+ * Initializes @iter with the first iterator in the tree (the one at the path
+ * "0") and returns %TRUE.  Returns %FALSE if the tree is empty.
+ * 
+ * Return value: %TRUE, if @iter was set.
  **/
 gboolean
-gtk_tree_model_get_first (GtkTreeModel *tree_model,
-                          GtkTreeIter  *iter)
+gtk_tree_model_get_iter_first (GtkTreeModel *tree_model,
+                              GtkTreeIter  *iter)
 {
-  gboolean retval;
   GtkTreePath *path;
+  gboolean retval;
 
   g_return_val_if_fail (GTK_IS_TREE_MODEL (tree_model), FALSE);
   g_return_val_if_fail (iter != NULL, FALSE);
 
-  path = gtk_tree_path_new_root ();
-
+  path = gtk_tree_path_new_first ();
   retval = gtk_tree_model_get_iter (tree_model, iter, path);
-
   gtk_tree_path_free (path);
 
   return retval;
@@ -699,21 +1094,24 @@ gtk_tree_model_get_first (GtkTreeModel *tree_model,
  * @tree_model: A #GtkTreeModel.
  * @iter: The #GtkTreeIter.
  *
- * Returns a newly created #GtkTreePath referenced by @iter.  This path should
- * be freed with #gtk_tree_path_free.
+ * Returns a newly-created #GtkTreePath referenced by @iter.  This path should
+ * be freed with gtk_tree_path_free().
  *
- * Return value: a newly created #GtkTreePath.
+ * Return value: a newly-created #GtkTreePath.
  **/
 GtkTreePath *
 gtk_tree_model_get_path (GtkTreeModel *tree_model,
                         GtkTreeIter  *iter)
 {
-  g_return_val_if_fail (tree_model != NULL, NULL);
-  g_return_val_if_fail (iter != NULL, NULL);
+  GtkTreeModelIface *iface;
+
   g_return_val_if_fail (GTK_IS_TREE_MODEL (tree_model), NULL);
-  g_return_val_if_fail (GTK_TREE_MODEL_GET_IFACE (tree_model)->get_path != NULL, NULL);
+  g_return_val_if_fail (iter != NULL, NULL);
+
+  iface = GTK_TREE_MODEL_GET_IFACE (tree_model);
+  g_return_val_if_fail (iface->get_path != NULL, NULL);
 
-  return (* GTK_TREE_MODEL_GET_IFACE (tree_model)->get_path) (tree_model, iter);
+  return (* iface->get_path) (tree_model, iter);
 }
 
 /**
@@ -723,8 +1121,8 @@ gtk_tree_model_get_path (GtkTreeModel *tree_model,
  * @column: The column to lookup the value at.
  * @value: An empty #GValue to set.
  *
- * Sets initializes and sets @value to that at @column.  When done with value,
- * #g_value_unset needs to be called on it.
+ * Sets initializes and sets @value to that at @column.  When done with @value,
+ * g_value_unset() needs to be called to free any allocated memory.
  **/
 void
 gtk_tree_model_get_value (GtkTreeModel *tree_model,
@@ -732,13 +1130,16 @@ gtk_tree_model_get_value (GtkTreeModel *tree_model,
                          gint          column,
                          GValue       *value)
 {
-  g_return_if_fail (tree_model != NULL);
-  g_return_if_fail (iter != NULL);
+  GtkTreeModelIface *iface;
+
   g_return_if_fail (GTK_IS_TREE_MODEL (tree_model));
+  g_return_if_fail (iter != NULL);
   g_return_if_fail (value != NULL);
-  g_return_if_fail (GTK_TREE_MODEL_GET_IFACE (tree_model)->get_value != NULL);
 
-  (* GTK_TREE_MODEL_GET_IFACE (tree_model)->get_value) (tree_model, iter, column, value);
+  iface = GTK_TREE_MODEL_GET_IFACE (tree_model);
+  g_return_if_fail (iface->get_value != NULL);
+
+  (* iface->get_value) (tree_model, iter, column, value);
 }
 
 /**
@@ -747,45 +1148,56 @@ gtk_tree_model_get_value (GtkTreeModel *tree_model,
  * @iter: The #GtkTreeIter.
  *
  * Sets @iter to point to the node following it at the current level.  If there
- * is no next @iter, FALSE is returned and @iter is set to be invalid.
+ * is no next @iter, %FALSE is returned and @iter is set to be invalid.
  *
- * Return value: TRUE if @iter has been changed to the next node.
+ * Return value: %TRUE if @iter has been changed to the next node.
  **/
 gboolean
 gtk_tree_model_iter_next (GtkTreeModel  *tree_model,
                          GtkTreeIter   *iter)
 {
-  g_return_val_if_fail (tree_model != NULL, FALSE);
+  GtkTreeModelIface *iface;
+
   g_return_val_if_fail (GTK_IS_TREE_MODEL (tree_model), FALSE);
   g_return_val_if_fail (iter != NULL, FALSE);
-  g_return_val_if_fail (GTK_TREE_MODEL_GET_IFACE (tree_model)->iter_next != NULL, FALSE);
 
-  return (* GTK_TREE_MODEL_GET_IFACE (tree_model)->iter_next) (tree_model, iter);
+  iface = GTK_TREE_MODEL_GET_IFACE (tree_model);
+  g_return_val_if_fail (iface->iter_next != NULL, FALSE);
+
+  return (* iface->iter_next) (tree_model, iter);
 }
 
 /**
  * gtk_tree_model_iter_children:
  * @tree_model: A #GtkTreeModel.
  * @iter: The new #GtkTreeIter to be set to the child.
- * @parent: The #GtkTreeIter.
+ * @parent: The #GtkTreeIter, or %NULL
  *
- * Sets @iter to point to the first child of @parent.  If @parent has no children,
- * FALSE is returned and @iter is set to be invalid.  @parent will remain a valid
- * node after this function has been called.
+ * Sets @iter to point to the first child of @parent.  If @parent has no 
+ * children, %FALSE is returned and @iter is set to be invalid.  @parent 
+ * will remain a valid node after this function has been called.
  *
- * Return value: TRUE, if @child has been set to the first child.
+ * If @parent is %NULL returns the first node, equivalent to
+ * <literal>gtk_tree_model_get_iter_first (tree_model, iter);</literal>
+ *
+ * Return value: %TRUE, if @child has been set to the first child.
  **/
 gboolean
 gtk_tree_model_iter_children (GtkTreeModel *tree_model,
                              GtkTreeIter  *iter,
                              GtkTreeIter  *parent)
 {
-  g_return_val_if_fail (tree_model != NULL, FALSE);
+  GtkTreeModelIface *iface;
+
   g_return_val_if_fail (GTK_IS_TREE_MODEL (tree_model), FALSE);
   g_return_val_if_fail (iter != NULL, FALSE);
-  g_return_val_if_fail (GTK_TREE_MODEL_GET_IFACE (tree_model)->iter_children != NULL, FALSE);
 
-  return (* GTK_TREE_MODEL_GET_IFACE (tree_model)->iter_children) (tree_model, iter, parent);
+  iface = GTK_TREE_MODEL_GET_IFACE (tree_model);
+  g_return_val_if_fail (iface->iter_children != NULL, FALSE);
+
+  INITIALIZE_TREE_ITER (iter);
+
+  return (* iface->iter_children) (tree_model, iter, parent);
 }
 
 /**
@@ -793,29 +1205,32 @@ gtk_tree_model_iter_children (GtkTreeModel *tree_model,
  * @tree_model: A #GtkTreeModel.
  * @iter: The #GtkTreeIter to test for children.
  *
- * Returns TRUE if @iter has children, FALSE otherwise.
+ * Returns %TRUE if @iter has children, %FALSE otherwise.
  *
- * Return value: TRUE if @iter has children.
+ * Return value: %TRUE if @iter has children.
  **/
 gboolean
 gtk_tree_model_iter_has_child (GtkTreeModel *tree_model,
                               GtkTreeIter  *iter)
 {
-  g_return_val_if_fail (tree_model != NULL, FALSE);
+  GtkTreeModelIface *iface;
+
   g_return_val_if_fail (GTK_IS_TREE_MODEL (tree_model), FALSE);
   g_return_val_if_fail (iter != NULL, FALSE);
-  g_return_val_if_fail (GTK_TREE_MODEL_GET_IFACE (tree_model)->iter_has_child != NULL, FALSE);
 
-  return (* GTK_TREE_MODEL_GET_IFACE (tree_model)->iter_has_child) (tree_model, iter);
+  iface = GTK_TREE_MODEL_GET_IFACE (tree_model);
+  g_return_val_if_fail (iface->iter_has_child != NULL, FALSE);
+
+  return (* iface->iter_has_child) (tree_model, iter);
 }
 
 /**
  * gtk_tree_model_iter_n_children:
  * @tree_model: A #GtkTreeModel.
- * @iter: The #GtkTreeIter, or NULL.
+ * @iter: The #GtkTreeIter, or %NULL.
  *
- * Returns the number of children that @iter has.  If @iter is NULL, then the
- * number of toplevel nodes is returned.
+ * Returns the number of children that @iter has.  As a special case, if @iter
+ * is %NULL, then the number of toplevel nodes is returned.
  *
  * Return value: The number of children of @iter.
  **/
@@ -823,27 +1238,30 @@ gint
 gtk_tree_model_iter_n_children (GtkTreeModel *tree_model,
                                GtkTreeIter  *iter)
 {
-  g_return_val_if_fail (tree_model != NULL, 0);
+  GtkTreeModelIface *iface;
+
   g_return_val_if_fail (GTK_IS_TREE_MODEL (tree_model), 0);
-  g_return_val_if_fail (GTK_TREE_MODEL_GET_IFACE (tree_model)->iter_n_children != NULL, 0);
 
-  return (* GTK_TREE_MODEL_GET_IFACE (tree_model)->iter_n_children) (tree_model, iter);
+  iface = GTK_TREE_MODEL_GET_IFACE (tree_model);
+  g_return_val_if_fail (iface->iter_n_children != NULL, 0);
+
+  return (* iface->iter_n_children) (tree_model, iter);
 }
 
 /**
  * gtk_tree_model_iter_nth_child:
  * @tree_model: A #GtkTreeModel.
  * @iter: The #GtkTreeIter to set to the nth child.
- * @parent: The #GtkTreeIter to get the child from, or NULL.
+ * @parent: The #GtkTreeIter to get the child from, or %NULL.
  * @n: Then index of the desired child.
  *
  * Sets @iter to be the child of @parent, using the given index.  The first
- * index is 0.  If the index is too big, or @parent has no children, @iter is
- * set to an invalid iterator and FALSE is returned.  @parent will remain a
- * valid node after this function has been called.  If @parent is NULL, then the
- * root node is assumed.
+ * index is 0.  If @n is too big, or @parent has no children, @iter is set
+ * to an invalid iterator and %FALSE is returned.  @parent will remain a valid
+ * node after this function has been called.  As a special case, if @parent is
+ * %NULL, then the @n<!-- -->th root node is set.
  *
- * Return value: TRUE, if @parent has an nth child.
+ * Return value: %TRUE, if @parent has an @n<!-- -->th child.
  **/
 gboolean
 gtk_tree_model_iter_nth_child (GtkTreeModel *tree_model,
@@ -851,13 +1269,18 @@ gtk_tree_model_iter_nth_child (GtkTreeModel *tree_model,
                               GtkTreeIter  *parent,
                               gint          n)
 {
-  g_return_val_if_fail (tree_model != NULL, FALSE);
+  GtkTreeModelIface *iface;
+
   g_return_val_if_fail (GTK_IS_TREE_MODEL (tree_model), FALSE);
   g_return_val_if_fail (iter != NULL, FALSE);
   g_return_val_if_fail (n >= 0, FALSE);
-  g_return_val_if_fail (GTK_TREE_MODEL_GET_IFACE (tree_model)->iter_nth_child != NULL, FALSE);
 
-  return (* GTK_TREE_MODEL_GET_IFACE (tree_model)->iter_nth_child) (tree_model, iter, parent, n);
+  iface = GTK_TREE_MODEL_GET_IFACE (tree_model);
+  g_return_val_if_fail (iface->iter_nth_child != NULL, FALSE);
+
+  INITIALIZE_TREE_ITER (iter);
+
+  return (* iface->iter_nth_child) (tree_model, iter, parent, n);
 }
 
 /**
@@ -867,24 +1290,29 @@ gtk_tree_model_iter_nth_child (GtkTreeModel *tree_model,
  * @child: The #GtkTreeIter.
  *
  * Sets @iter to be the parent of @child.  If @child is at the toplevel, and
- * doesn't have a parent, then @iter is set to an invalid iterator and FALSE
+ * doesn't have a parent, then @iter is set to an invalid iterator and %FALSE
  * is returned.  @child will remain a valid node after this function has been
  * called.
  *
- * Return value: TRUE, if @iter is set to the parent of @child.
+ * Return value: %TRUE, if @iter is set to the parent of @child.
  **/
 gboolean
 gtk_tree_model_iter_parent (GtkTreeModel *tree_model,
                            GtkTreeIter  *iter,
                            GtkTreeIter  *child)
 {
-  g_return_val_if_fail (tree_model != NULL, FALSE);
+  GtkTreeModelIface *iface;
+
   g_return_val_if_fail (GTK_IS_TREE_MODEL (tree_model), FALSE);
   g_return_val_if_fail (iter != NULL, FALSE);
   g_return_val_if_fail (child != NULL, FALSE);
-  g_return_val_if_fail (GTK_TREE_MODEL_GET_IFACE (tree_model)->iter_parent != NULL, FALSE);
+  
+  iface = GTK_TREE_MODEL_GET_IFACE (tree_model);
+  g_return_val_if_fail (iface->iter_parent != NULL, FALSE);
 
-  return (* GTK_TREE_MODEL_GET_IFACE (tree_model)->iter_parent) (tree_model, iter, child);
+  INITIALIZE_TREE_ITER (iter);
+
+  return (* iface->iter_parent) (tree_model, iter, child);
 }
 
 /**
@@ -896,21 +1324,26 @@ gtk_tree_model_iter_parent (GtkTreeModel *tree_model,
  * implement.  To be more specific, models may ignore this call as it exists
  * primarily for performance reasons.
  * 
- * This function is primarily meant as a way for views to let caching model know
- * when nodes are being displayed (and hence, whether or not to cache that
+ * This function is primarily meant as a way for views to let caching model 
+ * know when nodes are being displayed (and hence, whether or not to cache that
  * node.)  For example, a file-system based model would not want to keep the
- * entire file-heirarchy in memory, just the sections that are currently being
+ * entire file-hierarchy in memory, just the sections that are currently being
  * displayed by every current view.
+ *
+ * A model should be expected to be able to get an iter independent of its
+ * reffed state.
  **/
 void
 gtk_tree_model_ref_node (GtkTreeModel *tree_model,
                         GtkTreeIter  *iter)
 {
-  g_return_if_fail (tree_model != NULL);
+  GtkTreeModelIface *iface;
+
   g_return_if_fail (GTK_IS_TREE_MODEL (tree_model));
 
-  if (GTK_TREE_MODEL_GET_IFACE (tree_model)->ref_node)
-    (* GTK_TREE_MODEL_GET_IFACE (tree_model)->ref_node) (tree_model, iter);
+  iface = GTK_TREE_MODEL_GET_IFACE (tree_model);
+  if (iface->ref_node)
+    (* iface->ref_node) (tree_model, iter);
 }
 
 /**
@@ -922,18 +1355,21 @@ gtk_tree_model_ref_node (GtkTreeModel *tree_model,
  * implement.  To be more specific, models may ignore this call as it exists
  * primarily for performance reasons.
  *
- * For more information on what this means, please see #gtk_tree_model_ref_node.
+ * For more information on what this means, see gtk_tree_model_ref_node().
  * Please note that nodes that are deleted are not unreffed.
  **/
 void
 gtk_tree_model_unref_node (GtkTreeModel *tree_model,
                           GtkTreeIter  *iter)
 {
-  g_return_if_fail (tree_model != NULL);
+  GtkTreeModelIface *iface;
+
   g_return_if_fail (GTK_IS_TREE_MODEL (tree_model));
+  g_return_if_fail (iter != NULL);
 
-  if (GTK_TREE_MODEL_GET_IFACE (tree_model)->unref_node)
-    (* GTK_TREE_MODEL_GET_IFACE (tree_model)->unref_node) (tree_model, iter);
+  iface = GTK_TREE_MODEL_GET_IFACE (tree_model);
+  if (iface->unref_node)
+    (* iface->unref_node) (tree_model, iter);
 }
 
 /**
@@ -947,8 +1383,9 @@ gtk_tree_model_unref_node (GtkTreeModel *tree_model,
  * each column number followed by a place to store the value being
  * retrieved.  The list is terminated by a -1. For example, to get a
  * value from column 0 with type %G_TYPE_STRING, you would
- * write: gtk_tree_model_set (model, iter, 0, &place_string_here, -1),
- * where place_string_here is a gchar* to be filled with the string.
+ * write: <literal>gtk_tree_model_get (model, iter, 0, &amp;place_string_here, -1)</literal>,
+ * where <literal>place_string_here</literal> is a <type>gchar*</type> to be 
+ * filled with the string.
  * If appropriate, the returned values have to be freed or unreferenced.
  *
  **/
@@ -960,6 +1397,7 @@ gtk_tree_model_get (GtkTreeModel *tree_model,
   va_list var_args;
 
   g_return_if_fail (GTK_IS_TREE_MODEL (tree_model));
+  g_return_if_fail (iter != NULL);
 
   va_start (var_args, iter);
   gtk_tree_model_get_valist (tree_model, iter, var_args);
@@ -970,11 +1408,10 @@ gtk_tree_model_get (GtkTreeModel *tree_model,
  * gtk_tree_model_get_valist:
  * @tree_model: a #GtkTreeModel
  * @iter: a row in @tree_model
- * @var_args: va_list of column/return location pairs
- *
- * See gtk_tree_model_get(), this version takes a va_list for
- * language bindings to use.
+ * @var_args: <type>va_list</type> of column/return location pairs
  *
+ * See gtk_tree_model_get(), this version takes a <type>va_list</type> 
+ * for language bindings to use.
  **/
 void
 gtk_tree_model_get_valist (GtkTreeModel *tree_model,
@@ -984,6 +1421,7 @@ gtk_tree_model_get_valist (GtkTreeModel *tree_model,
   gint column;
 
   g_return_if_fail (GTK_IS_TREE_MODEL (tree_model));
+  g_return_if_fail (iter != NULL);
 
   column = va_arg (var_args, gint);
 
@@ -1018,73 +1456,173 @@ gtk_tree_model_get_valist (GtkTreeModel *tree_model,
     }
 }
 
+/**
+ * gtk_tree_model_row_changed:
+ * @tree_model: A #GtkTreeModel
+ * @path: A #GtkTreePath pointing to the changed row
+ * @iter: A valid #GtkTreeIter pointing to the changed row
+ * 
+ * Emits the "row_changed" signal on @tree_model.
+ **/
 void
-gtk_tree_model_range_changed (GtkTreeModel *tree_model,
-                             GtkTreePath  *start_path,
-                             GtkTreeIter  *start_iter,
-                             GtkTreePath  *end_path,
-                             GtkTreeIter  *end_iter)
+gtk_tree_model_row_changed (GtkTreeModel *tree_model,
+                           GtkTreePath  *path,
+                           GtkTreeIter  *iter)
 {
-  g_return_if_fail (tree_model != NULL);
   g_return_if_fail (GTK_IS_TREE_MODEL (tree_model));
-  g_return_if_fail (start_path != NULL);
-  g_return_if_fail (start_iter != NULL);
-  g_return_if_fail (end_path != NULL);
-  g_return_if_fail (end_iter != NULL);
+  g_return_if_fail (path != NULL);
+  g_return_if_fail (iter != NULL);
 
-  g_signal_emit_by_name (tree_model, "range_changed",
-                        start_path, start_iter,
-                        end_path, end_iter);
+  g_signal_emit (tree_model, tree_model_signals[ROW_CHANGED], 0, path, iter);
 }
 
+/**
+ * gtk_tree_model_row_inserted:
+ * @tree_model: A #GtkTreeModel
+ * @path: A #GtkTreePath pointing to the inserted row
+ * @iter: A valid #GtkTreeIter pointing to the inserted row
+ * 
+ * Emits the "row_inserted" signal on @tree_model
+ **/
 void
-gtk_tree_model_inserted (GtkTreeModel *tree_model,
-                        GtkTreePath  *path,
-                        GtkTreeIter  *iter)
+gtk_tree_model_row_inserted (GtkTreeModel *tree_model,
+                            GtkTreePath  *path,
+                            GtkTreeIter  *iter)
 {
-  g_return_if_fail (tree_model != NULL);
   g_return_if_fail (GTK_IS_TREE_MODEL (tree_model));
   g_return_if_fail (path != NULL);
   g_return_if_fail (iter != NULL);
 
-  g_signal_emit_by_name (tree_model, "inserted", path, iter);
+  g_signal_emit (tree_model, tree_model_signals[ROW_INSERTED], 0, path, iter);
 }
 
+/**
+ * gtk_tree_model_row_has_child_toggled:
+ * @tree_model: A #GtkTreeModel
+ * @path: A #GtkTreePath pointing to the changed row
+ * @iter: A valid #GtkTreeIter pointing to the changed row
+ * 
+ * Emits the "row_has_child_toggled" signal on @tree_model.  This should be
+ * called by models after the child state of a node changes.
+ **/
 void
-gtk_tree_model_has_child_toggled (GtkTreeModel *tree_model,
-                                 GtkTreePath  *path,
-                                 GtkTreeIter  *iter)
+gtk_tree_model_row_has_child_toggled (GtkTreeModel *tree_model,
+                                     GtkTreePath  *path,
+                                     GtkTreeIter  *iter)
 {
-  g_return_if_fail (tree_model != NULL);
   g_return_if_fail (GTK_IS_TREE_MODEL (tree_model));
   g_return_if_fail (path != NULL);
   g_return_if_fail (iter != NULL);
 
-  g_signal_emit_by_name (tree_model, "has_child_toggled", path, iter);
+  g_signal_emit (tree_model, tree_model_signals[ROW_HAS_CHILD_TOGGLED], 0, path, iter);
 }
 
+/**
+ * gtk_tree_model_row_deleted:
+ * @tree_model: A #GtkTreeModel
+ * @path: A #GtkTreePath pointing to the previous location of the deleted row.
+ * 
+ * Emits the "row_deleted" signal on @tree_model.  This should be called by
+ * models after a row has been removed.  The location pointed to by @path 
+ * should be the location that the row previously was at.  It may not be a 
+ * valid location anymore.
+ **/
 void
-gtk_tree_model_deleted (GtkTreeModel *tree_model,
-                       GtkTreePath  *path)
+gtk_tree_model_row_deleted (GtkTreeModel *tree_model,
+                           GtkTreePath  *path)
 {
-  g_return_if_fail (tree_model != NULL);
   g_return_if_fail (GTK_IS_TREE_MODEL (tree_model));
   g_return_if_fail (path != NULL);
 
-  g_signal_emit_by_name (tree_model, "deleted", path);
+  g_signal_emit (tree_model, tree_model_signals[ROW_DELETED], 0, path);
 }
 
+/**
+ * gtk_tree_model_rows_reordered:
+ * @tree_model: A #GtkTreeModel
+ * @path: A #GtkTreePath pointing to the tree node whose children have been 
+ *      reordered
+ * @iter: A valid #GtkTreeIter pointing to the node whose children have been 
+ *      reordered, or %NULL if the depth of @path is 0.
+ * @new_order: an array of integers mapping the current position of each child
+ *      to its old position before the re-ordering,
+ *      i.e. @new_order<literal>[newpos] = oldpos</literal>.
+ * 
+ * Emits the "rows_reordered" signal on @tree_model.  This should be called by
+ * models when their rows have been reordered.  
+ **/
 void
-gtk_tree_model_reordered (GtkTreeModel *tree_model,
-                         GtkTreePath  *path,
-                         GtkTreeIter  *iter,
-                         gint         *new_order)
+gtk_tree_model_rows_reordered (GtkTreeModel *tree_model,
+                              GtkTreePath  *path,
+                              GtkTreeIter  *iter,
+                              gint         *new_order)
 {
-  g_return_if_fail (tree_model != NULL);
   g_return_if_fail (GTK_IS_TREE_MODEL (tree_model));
   g_return_if_fail (new_order != NULL);
 
-  g_signal_emit_by_name (tree_model, "reordered", path, iter, new_order);
+  g_signal_emit (tree_model, tree_model_signals[ROWS_REORDERED], 0, path, iter, new_order);
+}
+
+
+static gboolean
+gtk_tree_model_foreach_helper (GtkTreeModel            *model,
+                              GtkTreeIter             *iter,
+                              GtkTreePath             *path,
+                              GtkTreeModelForeachFunc  func,
+                              gpointer                 user_data)
+{
+  do
+    {
+      GtkTreeIter child;
+
+      if ((* func) (model, path, iter, user_data))
+       return TRUE;
+
+      if (gtk_tree_model_iter_children (model, &child, iter))
+       {
+         gtk_tree_path_down (path);
+         if (gtk_tree_model_foreach_helper (model, &child, path, func, user_data))
+           return TRUE;
+         gtk_tree_path_up (path);
+       }
+
+      gtk_tree_path_next (path);
+    }
+  while (gtk_tree_model_iter_next (model, iter));
+
+  return FALSE;
+}
+
+/**
+ * gtk_tree_model_foreach:
+ * @model: A #GtkTreeModel
+ * @func: A function to be called on each row
+ * @user_data: User data to passed to func.
+ * 
+ * Calls func on each node in model in a depth-first fashion.  
+ * If @func returns %TRUE, then the tree ceases to be walked, and 
+ * gtk_tree_model_foreach() returns.
+ **/
+void
+gtk_tree_model_foreach (GtkTreeModel            *model,
+                       GtkTreeModelForeachFunc  func,
+                       gpointer                 user_data)
+{
+  GtkTreePath *path;
+  GtkTreeIter iter;
+
+  g_return_if_fail (GTK_IS_TREE_MODEL (model));
+  g_return_if_fail (func != NULL);
+
+  path = gtk_tree_path_new_first ();
+  if (gtk_tree_model_get_iter (model, &iter, path) == FALSE)
+    {
+      gtk_tree_path_free (path);
+      return;
+    }
+
+  gtk_tree_model_foreach_helper (model, &iter, path, func, user_data);
+  gtk_tree_path_free (path);
 }
 
 
@@ -1092,7 +1630,24 @@ gtk_tree_model_reordered (GtkTreeModel *tree_model,
  * GtkTreeRowReference
  */
 
-#define ROW_REF_DATA_STRING "gtk-tree-row-refs"
+static void gtk_tree_row_reference_unref_path (GtkTreePath  *path,
+                                              GtkTreeModel *model,
+                                              gint          depth);
+
+
+GType
+gtk_tree_row_reference_get_type (void)
+{
+  static GType our_type = 0;
+  
+  if (our_type == 0)
+    our_type = g_boxed_type_register_static (I_("GtkTreeRowReference"),
+                                            (GBoxedCopyFunc) gtk_tree_row_reference_copy,
+                                            (GBoxedFreeFunc) gtk_tree_row_reference_free);
+
+  return our_type;
+}
+
 
 struct _GtkTreeRowReference
 {
@@ -1101,11 +1656,6 @@ struct _GtkTreeRowReference
   GtkTreePath *path;
 };
 
-typedef struct
-{
-  GSList *list;
-} RowRefList;
-
 
 static void
 release_row_references (gpointer data)
@@ -1132,13 +1682,10 @@ release_row_references (gpointer data)
 }
 
 static void
-gtk_tree_row_ref_inserted_callback (GObject     *object,
-                                   GtkTreePath *path,
-                                   GtkTreeIter *iter,
-                                   gpointer     data)
+gtk_tree_row_ref_inserted (RowRefList  *refs,
+                          GtkTreePath *path,
+                          GtkTreeIter *iter)
 {
-  RowRefList *refs = g_object_get_data (data, ROW_REF_DATA_STRING);
-
   GSList *tmp_list;
 
   if (refs == NULL)
@@ -1159,35 +1706,37 @@ gtk_tree_row_ref_inserted_callback (GObject     *object,
     {
       GtkTreeRowReference *reference = tmp_list->data;
 
-      if (reference->path)
+      if (reference->path == NULL)
+       goto done;
+
+      if (reference->path->depth >= path->depth)
        {
-         gint depth = gtk_tree_path_get_depth (path);
-         gint ref_depth = gtk_tree_path_get_depth (reference->path);
+         gint i;
+         gboolean ancestor = TRUE;
 
-         if (ref_depth >= depth)
+         for (i = 0; i < path->depth - 1; i ++)
            {
-             gint *indices = gtk_tree_path_get_indices (path);
-             gint *ref_indices = gtk_tree_path_get_indices (reference->path);
-             gint i;
-
-             /* This is the depth that might affect us. */
-             i = depth - 1;
-
-             if (indices[i] <= ref_indices[i])
-               ref_indices[i] += 1;
+             if (path->indices[i] != reference->path->indices[i])
+               {
+                 ancestor = FALSE;
+                 break;
+               }
            }
-       }
+         if (ancestor == FALSE)
+           goto done;
 
+         if (path->indices[path->depth-1] <= reference->path->indices[path->depth-1])
+           reference->path->indices[path->depth-1] += 1;
+       }
+    done:
       tmp_list = g_slist_next (tmp_list);
     }
 }
 
 static void
-gtk_tree_row_ref_deleted_callback (GObject     *object,
-                                  GtkTreePath *path,
-                                  gpointer     data)
+gtk_tree_row_ref_deleted (RowRefList  *refs,
+                         GtkTreePath *path)
 {
-  RowRefList *refs = g_object_get_data (data, ROW_REF_DATA_STRING);
   GSList *tmp_list;
 
   if (refs == NULL)
@@ -1198,10 +1747,6 @@ gtk_tree_row_ref_deleted_callback (GObject     *object,
    * deletion with the old path of the just-deleted row. Which means
    * that the deleted path is the same now-defunct "coordinate system"
    * as the path saved in the reference, which is what we want to fix.
-   *
-   * Note that this is different from the situation in "inserted," so
-   * while you might think you can cut-and-paste between these
-   * functions, it's not going to work. ;-)
    */
 
   tmp_list = refs->list;
@@ -1212,43 +1757,47 @@ gtk_tree_row_ref_deleted_callback (GObject     *object,
 
       if (reference->path)
        {
-         gint depth = gtk_tree_path_get_depth (path);
-         gint ref_depth = gtk_tree_path_get_depth (reference->path);
+         gint i;
 
-         if (ref_depth >= depth)
+         if (path->depth > reference->path->depth)
+           goto next;
+         for (i = 0; i < path->depth - 1; i++)
            {
-             /* Need to adjust path upward */
-             gint *indices = gtk_tree_path_get_indices (path);
-             gint *ref_indices = gtk_tree_path_get_indices (reference->path);
-             gint i;
-
-             i = depth - 1;
-             if (indices[i] < ref_indices[i])
-               ref_indices[i] -= 1;
-             else if (indices[i] == ref_indices[i])
-               {
-                 /* the referenced node itself, or its parent, was
-                  * deleted, mark invalid
-                  */
-
-                 gtk_tree_path_free (reference->path);
-                 reference->path = NULL;
-               }
+             if (path->indices[i] != reference->path->indices[i])
+               goto next;
            }
 
+         /* We know it affects us. */
+         if (path->indices[i] == reference->path->indices[i])
+           {
+             if (reference->path->depth > path->depth)
+               /* some parent was deleted, trying to unref any node
+                * between the deleted parent and the node the reference
+                * is pointing to is bad, as those nodes are already gone.
+                */
+               gtk_tree_row_reference_unref_path (reference->path, reference->model, path->depth - 1);
+             else
+               gtk_tree_row_reference_unref_path (reference->path, reference->model, reference->path->depth - 1);
+             gtk_tree_path_free (reference->path);
+             reference->path = NULL;
+           }
+         else if (path->indices[i] < reference->path->indices[i])
+           {
+             reference->path->indices[path->depth-1]-=1;
+           }
        }
+
+next:
       tmp_list = g_slist_next (tmp_list);
     }
 }
 
 static void
-gtk_tree_row_ref_reordered_callback (GObject     *object,
-                                    GtkTreePath *path,
-                                    GtkTreeIter *iter,
-                                    gint        *new_order,
-                                    gpointer     data)
+gtk_tree_row_ref_reordered (RowRefList  *refs,
+                           GtkTreePath *path,
+                           GtkTreeIter *iter,
+                           gint        *new_order)
 {
-  RowRefList *refs = g_object_get_data (data, ROW_REF_DATA_STRING);
   GSList *tmp_list;
   gint length;
 
@@ -1282,7 +1831,7 @@ gtk_tree_row_ref_reordered_callback (GObject     *object,
                  if (new_order[i] == indices[depth])
                    {
                      indices[depth] = i;
-                     return;
+                     break;
                    }
                }
            }
@@ -1290,68 +1839,96 @@ gtk_tree_row_ref_reordered_callback (GObject     *object,
 
       tmp_list = g_slist_next (tmp_list);
     }
-  
 }
-     
+
+/* We do this recursively so that we can unref children nodes before their parent */
 static void
-connect_ref_callbacks (GtkTreeModel *model)
-{
-  g_signal_connect_data (G_OBJECT (model),
-                         "inserted",
-                         (GCallback) gtk_tree_row_ref_inserted_callback,
-                         model,
-                         NULL,
-                         FALSE,
-                         FALSE);
-
-  g_signal_connect_data (G_OBJECT (model),
-                         "deleted",
-                         (GCallback) gtk_tree_row_ref_deleted_callback,
-                        model,
-                         NULL,
-                         FALSE,
-                         FALSE);
-
-  g_signal_connect_data (G_OBJECT (model),
-                         "reordered",
-                         (GCallback) gtk_tree_row_ref_reordered_callback,
-                        model,
-                         NULL,
-                         FALSE,
-                         FALSE);
+gtk_tree_row_reference_unref_path_helper (GtkTreePath  *path,
+                                         GtkTreeModel *model,
+                                         GtkTreeIter  *parent_iter,
+                                         gint          depth,
+                                         gint          current_depth)
+{
+  GtkTreeIter iter;
+
+  if (depth == current_depth)
+    return;
+
+  gtk_tree_model_iter_nth_child (model, &iter, parent_iter, path->indices[current_depth]);
+  gtk_tree_row_reference_unref_path_helper (path, model, &iter, depth, current_depth + 1);
+  gtk_tree_model_unref_node (model, &iter);
 }
 
 static void
-disconnect_ref_callbacks (GtkTreeModel *model)
-{
-  g_signal_handlers_disconnect_matched (G_OBJECT (model),
-                                        G_SIGNAL_MATCH_FUNC,
-                                        0, 0, NULL,
-                                       gtk_tree_row_ref_inserted_callback,
-                                       NULL);
-  g_signal_handlers_disconnect_matched (G_OBJECT (model),
-                                        G_SIGNAL_MATCH_FUNC,
-                                        0, 0, NULL,
-                                       gtk_tree_row_ref_deleted_callback,
-                                       NULL);
-  g_signal_handlers_disconnect_matched (G_OBJECT (model),
-                                        G_SIGNAL_MATCH_FUNC,
-                                        0, 0, NULL,
-                                       gtk_tree_row_ref_reordered_callback,
-                                       NULL);
+gtk_tree_row_reference_unref_path (GtkTreePath  *path,
+                                  GtkTreeModel *model,
+                                  gint          depth)
+{
+  GtkTreeIter iter;
+
+  if (depth <= 0)
+    return;
+  
+  gtk_tree_model_iter_nth_child (model, &iter, NULL, path->indices[0]);
+  gtk_tree_row_reference_unref_path_helper (path, model, &iter, depth, 1);
+  gtk_tree_model_unref_node (model, &iter);
 }
 
+/**
+ * gtk_tree_row_reference_new:
+ * @model: A #GtkTreeModel
+ * @path: A valid #GtkTreePath to monitor
+ * 
+ * Creates a row reference based on @path.  This reference will keep pointing 
+ * to the node pointed to by @path, so long as it exists.  It listens to all
+ * signals emitted by @model, and updates its path appropriately.  If @path
+ * isn't a valid path in @model, then %NULL is returned.
+ * 
+ * Return value: A newly allocated #GtkTreeRowReference, or %NULL
+ **/
 GtkTreeRowReference *
 gtk_tree_row_reference_new (GtkTreeModel *model,
                             GtkTreePath  *path)
 {
-  g_return_val_if_fail (model != NULL, NULL);
   g_return_val_if_fail (GTK_IS_TREE_MODEL (model), NULL);
   g_return_val_if_fail (path != NULL, NULL);
 
+  /* We use the model itself as the proxy object; and call
+   * gtk_tree_row_reference_inserted(), etc, in the
+   * class closure (default handler) marshalers for the signal.
+   */  
   return gtk_tree_row_reference_new_proxy (G_OBJECT (model), model, path);
 }
 
+/**
+ * gtk_tree_row_reference_new_proxy:
+ * @proxy: A proxy #GObject
+ * @model: A #GtkTreeModel
+ * @path: A valid #GtkTreePath to monitor
+ * 
+ * You do not need to use this function.  Creates a row reference based on
+ * @path.  This reference will keep pointing to the node pointed to by @path, 
+ * so long as it exists.  If @path isn't a valid path in @model, then %NULL is
+ * returned.  However, unlike references created with
+ * gtk_tree_row_reference_new(), it does not listen to the model for changes.
+ * The creator of the row reference must do this explicitly using
+ * gtk_tree_row_reference_inserted(), gtk_tree_row_reference_deleted(),
+ * gtk_tree_row_reference_reordered().
+ * 
+ * These functions must be called exactly once per proxy when the
+ * corresponding signal on the model is emitted. This single call
+ * updates all row references for that proxy. Since built-in GTK+
+ * objects like #GtkTreeView already use this mechanism internally,
+ * using them as the proxy object will produce unpredictable results.
+ * Further more, passing the same object as @model and @proxy
+ * doesn't work for reasons of internal implementation.
+ *
+ * This type of row reference is primarily meant by structures that need to
+ * carefully monitor exactly when a row reference updates itself, and is not
+ * generally needed by most applications.
+ *
+ * Return value: A newly allocated #GtkTreeRowReference, or %NULL
+ **/
 GtkTreeRowReference *
 gtk_tree_row_reference_new_proxy (GObject      *proxy,
                                  GtkTreeModel *model,
@@ -1359,13 +1936,35 @@ gtk_tree_row_reference_new_proxy (GObject      *proxy,
 {
   GtkTreeRowReference *reference;
   RowRefList *refs;
+  GtkTreeIter parent_iter;
+  gint i;
 
   g_return_val_if_fail (G_IS_OBJECT (proxy), NULL);
   g_return_val_if_fail (GTK_IS_TREE_MODEL (model), NULL);
   g_return_val_if_fail (path != NULL, NULL);
+  g_return_val_if_fail (path->depth > 0, NULL);
 
+  /* check that the path is valid */
+  if (gtk_tree_model_get_iter (model, &parent_iter, path) == FALSE)
+    return NULL;
+
+  /* Now we want to ref every node */
+  gtk_tree_model_iter_nth_child (model, &parent_iter, NULL, path->indices[0]);
+  gtk_tree_model_ref_node (model, &parent_iter);
+
+  for (i = 1; i < path->depth; i++)
+    {
+      GtkTreeIter iter;
+      gtk_tree_model_iter_nth_child (model, &iter, &parent_iter, path->indices[i]);
+      gtk_tree_model_ref_node (model, &iter);
+      parent_iter = iter;
+    }
+
+  /* Make the row reference */
   reference = g_new (GtkTreeRowReference, 1);
 
+  g_object_ref (proxy);
+  g_object_ref (model);
   reference->proxy = proxy;
   reference->model = model;
   reference->path = gtk_tree_path_copy (path);
@@ -1377,11 +1976,8 @@ gtk_tree_row_reference_new_proxy (GObject      *proxy,
       refs = g_new (RowRefList, 1);
       refs->list = NULL;
 
-      if (G_OBJECT (model) == proxy)
-       connect_ref_callbacks (model);
-
       g_object_set_data_full (G_OBJECT (proxy),
-                             ROW_REF_DATA_STRING,
+                             I_(ROW_REF_DATA_STRING),
                               refs, release_row_references);
     }
 
@@ -1390,6 +1986,15 @@ gtk_tree_row_reference_new_proxy (GObject      *proxy,
   return reference;
 }
 
+/**
+ * gtk_tree_row_reference_get_path:
+ * @reference: A #GtkTreeRowReference
+ * 
+ * Returns a path that the row reference currently points to, or %NULL if the
+ * path pointed to is no longer valid.
+ * 
+ * Return value: A current path, or %NULL.
+ **/
 GtkTreePath *
 gtk_tree_row_reference_get_path (GtkTreeRowReference *reference)
 {
@@ -1404,59 +2009,147 @@ gtk_tree_row_reference_get_path (GtkTreeRowReference *reference)
   return gtk_tree_path_copy (reference->path);
 }
 
+/**
+ * gtk_tree_row_reference_get_model:
+ * @reference: A #GtkTreeRowReference
+ *
+ * Returns the model that the row reference is monitoring.
+ *
+ * Return value: the model
+ *
+ * Since: 2.8
+ */
+GtkTreeModel *
+gtk_tree_row_reference_get_model (GtkTreeRowReference *reference)
+{
+  g_return_val_if_fail (reference != NULL, NULL);
+
+  return reference->model;
+}
+
+/**
+ * gtk_tree_row_reference_valid:
+ * @reference: A #GtkTreeRowReference, or %NULL
+ * 
+ * Returns %TRUE if the @reference is non-%NULL and refers to a current valid
+ * path.
+ * 
+ * Return value: %TRUE if @reference points to a valid path.
+ **/
+gboolean
+gtk_tree_row_reference_valid (GtkTreeRowReference *reference)
+{
+  if (reference == NULL || reference->path == NULL)
+    return FALSE;
+
+  return TRUE;
+}
+
+
+/**
+ * gtk_tree_row_reference_copy:
+ * @reference: a #GtkTreeRowReference
+ * 
+ * Copies a #GtkTreeRowReference.
+ * 
+ * Return value: a copy of @reference.
+ *
+ * Since: 2.2
+ **/
+GtkTreeRowReference *
+gtk_tree_row_reference_copy (GtkTreeRowReference *reference)
+{
+  return gtk_tree_row_reference_new_proxy (reference->proxy,
+                                          reference->model,
+                                          reference->path);
+}
+
+/**
+ * gtk_tree_row_reference_free:
+ * @reference: A #GtkTreeRowReference, or %NULL
+ * 
+ * Free's @reference. @reference may be %NULL.
+ **/
 void
 gtk_tree_row_reference_free (GtkTreeRowReference *reference)
 {
   RowRefList *refs;
 
-  g_return_if_fail (reference != NULL);
+  if (reference == NULL)
+    return;
+
+  refs = g_object_get_data (G_OBJECT (reference->proxy), ROW_REF_DATA_STRING);
 
-  if (reference->proxy)
+  if (refs == NULL)
     {
-      refs = g_object_get_data (G_OBJECT (reference->proxy), ROW_REF_DATA_STRING);
-
-      if (refs == NULL)
-        {
-          g_warning (G_STRLOC": bad row reference, proxy has no outstanding row references");
-          return;
-        }
-
-      refs->list = g_slist_remove (refs->list, reference);
-
-      if (refs->list == NULL)
-        {
-          disconnect_ref_callbacks (reference->model);
-          g_object_set_data (G_OBJECT (reference->proxy),
-                             ROW_REF_DATA_STRING,
-                             NULL);
-        }
+      g_warning (G_STRLOC": bad row reference, proxy has no outstanding row references");
+      return;
+    }
+
+  refs->list = g_slist_remove (refs->list, reference);
+
+  if (refs->list == NULL)
+    {
+      g_object_set_data (G_OBJECT (reference->proxy),
+                        I_(ROW_REF_DATA_STRING),
+                        NULL);
     }
 
   if (reference->path)
-    gtk_tree_path_free (reference->path);
+    {
+      gtk_tree_row_reference_unref_path (reference->path, reference->model, reference->path->depth);
+      gtk_tree_path_free (reference->path);
+    }
 
+  g_object_unref (reference->proxy);
+  g_object_unref (reference->model);
   g_free (reference);
 }
 
+/**
+ * gtk_tree_row_reference_inserted:
+ * @proxy: A #GObject
+ * @path: The row position that was inserted
+ * 
+ * Lets a set of row reference created by gtk_tree_row_reference_new_proxy()
+ * know that the model emitted the "row_inserted" signal.
+ **/
 void
 gtk_tree_row_reference_inserted (GObject     *proxy,
                                 GtkTreePath *path)
 {
   g_return_if_fail (G_IS_OBJECT (proxy));
 
-  gtk_tree_row_ref_inserted_callback (NULL, path, NULL, proxy);
-  
+  gtk_tree_row_ref_inserted ((RowRefList *)g_object_get_data (proxy, ROW_REF_DATA_STRING), path, NULL);
 }
 
+/**
+ * gtk_tree_row_reference_deleted:
+ * @proxy: A #GObject
+ * @path: The path position that was deleted
+ * 
+ * Lets a set of row reference created by gtk_tree_row_reference_new_proxy()
+ * know that the model emitted the "row_deleted" signal.
+ **/
 void
 gtk_tree_row_reference_deleted (GObject     *proxy,
                                GtkTreePath *path)
 {
   g_return_if_fail (G_IS_OBJECT (proxy));
 
-  gtk_tree_row_ref_deleted_callback (NULL, path, proxy);
+  gtk_tree_row_ref_deleted ((RowRefList *)g_object_get_data (proxy, ROW_REF_DATA_STRING), path);
 }
 
+/**
+ * gtk_tree_row_reference_reordered:
+ * @proxy: A #GObject
+ * @path: The parent path of the reordered signal
+ * @iter: The iter pointing to the parent of the reordered
+ * @new_order: The new order of rows
+ * 
+ * Lets a set of row reference created by gtk_tree_row_reference_new_proxy()
+ * know that the model emitted the "rows_reordered" signal.
+ **/
 void
 gtk_tree_row_reference_reordered (GObject     *proxy,
                                  GtkTreePath *path,
@@ -1465,6 +2158,8 @@ gtk_tree_row_reference_reordered (GObject     *proxy,
 {
   g_return_if_fail (G_IS_OBJECT (proxy));
 
-  gtk_tree_row_ref_reordered_callback (NULL, path, iter, new_order, proxy);
+  gtk_tree_row_ref_reordered ((RowRefList *)g_object_get_data (proxy, ROW_REF_DATA_STRING), path, iter, new_order);
 }
-  
+
+#define __GTK_TREE_MODEL_C__
+#include "gtkaliasdef.c"