Add signal for notification of object position changes

(bzr r206)

2 files changed, 8 insertions, 0 deletions

diff --git a/src/sp-object.cpp b/src/sp-object.cpp
index 4a1a2e09e..fd368dd61 100644
--- a/src/sp-object.cpp
+++ b/src/sp-object.cpp
@@ -192,6 +192,7 @@ sp_object_init(SPObject *object)
     object->_collection_policy = SPObject::COLLECT_WITH_PARENT;
 
     new (&object->_delete_signal) sigc::signal<void, SPObject *>();
+    new (&object->_position_changed_signal) sigc::signal<void, SPObject *>();
     object->_successor = NULL;
 
     object->_label = NULL;
@@ -221,6 +222,7 @@ sp_object_finalize(GObject *object)
     }
 
     spobject->_delete_signal.~signal();
+    spobject->_position_changed_signal.~signal();
 }
 
 namespace {
@@ -771,6 +773,7 @@ static void sp_object_order_changed(SPObject *object, Inkscape::XML::Node *child
     g_return_if_fail(ochild != NULL);
     SPObject *prev = new_ref ? sp_object_get_child_by_repr(object, new_ref) : NULL;
     sp_object_reorder(ochild, prev);
+    ochild->_position_changed_signal.emit(ochild);
 }
 
 /**
diff --git a/src/sp-object.h b/src/sp-object.h
index 767f8b978..e853de097 100644
--- a/src/sp-object.h
+++ b/src/sp-object.h
@@ -322,6 +322,10 @@ struct SPObject : public GObject {
         return _delete_signal.connect(slot);
     }
 
+    sigc::connection connectPositionChanged(sigc::slot<void, SPObject *> slot) {
+        return _position_changed_signal.connect(slot);
+    }
+
     /** @brief Returns the object which supercedes this one (if any).
      *
      * This is mainly useful for ensuring we can correctly perform a series of moves or deletes,
@@ -442,6 +446,7 @@ struct SPObject : public GObject {
     void _requireSVGVersion(Inkscape::Version version);
 
     sigc::signal<void, SPObject *> _delete_signal;
+    sigc::signal<void, SPObject *> _position_changed_signal;
     SPObject *_successor;
     CollectionPolicy _collection_policy;
     gchar *_label;