new utility function which returns the neighbor of a container's active

2007-05-27  Michael Natterer  <mitch@gimp.org>

	* app/core/gimp-utils.[ch] (gimp_container_get_neighbor_of_active):
	new utility function which returns the neighbor of a container's
	active item.

	* app/widgets/gimpcontainerview-utils.[ch]
	(gimp_container_view_remove_active): remove a container view's
	active item, using above function to select its neighbor.

	* app/actions/data-commands.c
	* app/actions/buffers-commands.c
	* app/actions/documents-commands.c
	* app/actions/templates-commands.c: use above functions to select
	reasonable items when deleting from a list (instead of always
	jumping to the first item).



svn path=/trunk/; revision=22632

app/core/gimp-utils.c

@@ -52,6 +52,8 @@
 
 #include "gimp.h"
 #include "gimp-utils.h"
+#include "gimpcontainer.h"
+#include "gimpcontext.h"
 #include "gimpparamspecs.h"
 
 
@@ -508,3 +510,32 @@ gimp_get_temp_filename (Gimp        *gimp,
 
   return filename;
 }
+
+GimpObject *
+gimp_container_get_neighbor_of_active (GimpContainer *container,
+                                       GimpContext   *context,
+                                       GimpObject    *active)
+{
+  g_return_val_if_fail (GIMP_IS_CONTAINER (container), NULL);
+  g_return_val_if_fail (GIMP_IS_CONTEXT (context), NULL);
+  g_return_val_if_fail (GIMP_IS_OBJECT (active), NULL);
+
+  if (active == gimp_context_get_by_type (context, container->children_type))
+    {
+      gint index = gimp_container_get_child_index (container, active);
+
+      if (index != -1)
+        {
+          GimpObject *new;
+
+          new = gimp_container_get_child_by_index (container, index + 1);
+
+          if (! new && index > 0)
+            new = gimp_container_get_child_by_index (container, index - 1);
+
+          return new;
+        }
+    }
+
+  return NULL;
+}