From 7c05499865f975b193eef32692996a3b71571cf1 Mon Sep 17 00:00:00 2001
From: Emmanuele Bassi <ebassi@openedhand.com>
Date: Wed, 19 Mar 2008 18:33:33 +0000
Subject: [PATCH] 2008-03-19  Emmanuele Bassi  <ebassi@openedhand.com>

	* clutter/clutter-model.[ch]: Add a ::copy() virtual function
	for copying iterators.

	* clutter/clutter-list-model.c:
	(clutter_list_model_iter_copy),
	(clutter_list_model_iter_class_init): Implement the ::copy()
	function inside the ListModel iterator subclass.
---
 ChangeLog                    | 10 ++++++++++
 clutter/clutter-list-model.c | 28 ++++++++++++++++++++++++++++
 clutter/clutter-model.c      | 35 +++++++++++++++++++++++++++++++++++
 clutter/clutter-model.h      |  5 ++++-
 4 files changed, 77 insertions(+), 1 deletion(-)

diff --git a/ChangeLog b/ChangeLog
index 3fc97b952..dc49a99be 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,13 @@
+2008-03-19  Emmanuele Bassi  <ebassi@openedhand.com>
+
+	* clutter/clutter-model.[ch]: Add a ::copy() virtual function
+	for copying iterators.
+
+	* clutter/clutter-list-model.c:
+	(clutter_list_model_iter_copy),
+	(clutter_list_model_iter_class_init): Implement the ::copy()
+	function inside the ListModel iterator subclass.
+
 2008-03-19  Emmanuele Bassi  <ebassi@openedhand.com>
 
 	* clutter/clutter-group.c:
diff --git a/clutter/clutter-list-model.c b/clutter/clutter-list-model.c
index bbd4a5716..6cca26c24 100644
--- a/clutter/clutter-list-model.c
+++ b/clutter/clutter-list-model.c
@@ -418,6 +418,33 @@ clutter_list_model_iter_prev (ClutterModelIter *iter)
 
   return CLUTTER_MODEL_ITER (iter_default);
 }
+
+static ClutterModelIter *
+clutter_list_model_iter_copy (ClutterModelIter *iter)
+{
+  ClutterListModelIter *iter_default;
+  ClutterListModelIter *iter_copy;
+  ClutterModel *model;
+  guint row;
+ 
+  iter_default = CLUTTER_LIST_MODEL_ITER (iter);
+
+  model = clutter_model_iter_get_model (iter);
+  row   = clutter_model_iter_get_row (iter) - 1;
+
+  iter_copy = g_object_new (CLUTTER_TYPE_LIST_MODEL_ITER,
+                            "model", model,
+                            "row", row,
+                            NULL);
+
+  /* this is safe, because the seq_iter pointer on the passed
+   * iterator will be always be overwritten in ::next or ::prev
+   */
+  iter_copy->seq_iter = iter_default->seq_iter;
+
+  return CLUTTER_MODEL_ITER (iter_copy);
+}
+
 static void
 clutter_list_model_iter_class_init (ClutterListModelIterClass *klass)
 {
@@ -429,6 +456,7 @@ clutter_list_model_iter_class_init (ClutterListModelIterClass *klass)
   iter_class->is_last   = clutter_list_model_iter_is_last;
   iter_class->next      = clutter_list_model_iter_next;
   iter_class->prev      = clutter_list_model_iter_prev;
+  iter_class->copy      = clutter_list_model_iter_copy;
 }
 
 static void
diff --git a/clutter/clutter-model.c b/clutter/clutter-model.c
index 2bd165ddf..568e840b9 100644
--- a/clutter/clutter-model.c
+++ b/clutter/clutter-model.c
@@ -1473,6 +1473,16 @@ clutter_model_iter_prev_unimplemented (ClutterModelIter *iter)
   return NULL;
 }
 
+static ClutterModelIter *
+clutter_model_iter_copy_unimplemented (ClutterModelIter *iter)
+{
+  g_warning ("%s: Iterator of type `%s' does not implement the "
+             "ClutterModelIter::copy() virtual function",
+             G_STRLOC,
+             g_type_name (G_OBJECT_TYPE (iter)));
+  return NULL;
+}
+
 static void
 clutter_model_iter_get_property (GObject    *object,
                                  guint       prop_id,
@@ -1535,6 +1545,7 @@ clutter_model_iter_class_init (ClutterModelIterClass *klass)
   klass->prev      = clutter_model_iter_prev_unimplemented;
   klass->get_value = clutter_model_iter_get_value_unimplemented;
   klass->set_value = clutter_model_iter_set_value_unimplemented;
+  klass->copy      = clutter_model_iter_copy_unimplemented;
 
   /* Properties */
 
@@ -1989,3 +2000,27 @@ clutter_model_iter_get_row (ClutterModelIter *iter)
 
   return 0;
 }
+
+/**
+ * clutter_model_iter_copy:
+ * @iter: a #ClutterModelIter
+ *
+ * Copies the passed iterator.
+ *
+ * Return value: a copy of the iterator, or %NULL
+ *
+ * Since: 0.8
+ */
+ClutterModelIter *
+clutter_model_iter_copy (ClutterModelIter *iter)
+{
+  ClutterModelIterClass *klass;
+
+  g_return_val_if_fail (CLUTTER_IS_MODEL_ITER (iter), NULL);
+
+  klass = CLUTTER_MODEL_ITER_GET_CLASS (iter);
+  if (klass->copy)
+    return klass->copy (iter);
+
+  return NULL;
+}
diff --git a/clutter/clutter-model.h b/clutter/clutter-model.h
index f39900175..cfe128d34 100644
--- a/clutter/clutter-model.h
+++ b/clutter/clutter-model.h
@@ -325,9 +325,11 @@ struct _ClutterModelIterClass
   ClutterModelIter *(* next)      (ClutterModelIter *iter);
   ClutterModelIter *(* prev)      (ClutterModelIter *iter);
 
-  ClutterModel*     (* get_model) (ClutterModelIter *iter);
+  ClutterModel *    (* get_model) (ClutterModelIter *iter);
   guint             (* get_row)   (ClutterModelIter *iter);
 
+  ClutterModelIter *(* copy)      (ClutterModelIter *iter);
+
   /*< private >*/
   /* padding for future */
   void (*_clutter_model_iter_1) (void);
@@ -361,6 +363,7 @@ ClutterModelIter *clutter_model_iter_prev       (ClutterModelIter *iter);
 ClutterModel *    clutter_model_iter_get_model  (ClutterModelIter *iter);
 guint             clutter_model_iter_get_row    (ClutterModelIter *iter);
 
+ClutterModelIter *clutter_model_iter_copy       (ClutterModelIter *iter);
 
 G_END_DECLS