[gegl] gegl-binary: refresh mrg scroll api

[Øyvind Kolås <ok src gnome org>]

commit e35a848e9e865b5346105f410e1e74ea795bf4ea
Author: Øyvind Kolås <pippin gimp org>
Date:   Wed Mar 9 21:45:00 2016 +0100

    gegl-binary: refresh mrg scroll api

 bin/ui.c |   18 ++++++++++++------
 1 files changed, 12 insertions(+), 6 deletions(-)
---
diff --git a/bin/ui.c b/bin/ui.c
index 42437db..874e0c6 100644
--- a/bin/ui.c
+++ b/bin/ui.c
@@ -1093,8 +1093,7 @@ static void gegl_ui (Mrg *mrg, void *data)
   mrg_add_binding (mrg, "f", NULL, NULL,         toggle_fullscreen_cb, o);
   mrg_add_binding (mrg, "F11", NULL, NULL,       toggle_fullscreen_cb, o);
   mrg_add_binding (mrg, "tab", NULL, NULL,       toggle_show_controls_cb, o);
-  mrg_add_binding (mrg, "s", NULL, NULL,       toggle_slideshow_cb, o);
-
+  mrg_add_binding (mrg, "s", NULL, NULL,         toggle_slideshow_cb, o);
   mrg_add_binding (mrg, ",", NULL, NULL,         preview_less_cb, o);
   mrg_add_binding (mrg, ".", NULL, NULL,         preview_more_cb, o);
 }
@@ -1739,10 +1738,17 @@ static void zoom_out_cb (MrgEvent *event, void *data1, void *data2)
 
 static void scroll_cb (MrgEvent *event, void *data1, void *data2)
 {
-  if (event->scroll_direction)
-    zoom_at (data1, event->device_x, event->device_y, 1.0/1.05);
-  else 
-    zoom_at (data1, event->device_x, event->device_y, 1.05);
+  switch (event->scroll_direction)
+  {
+     case MRG_SCROLL_DIRECTION_DOWN:
+       zoom_at (data1, event->device_x, event->device_y, 1.0/1.05);
+       break;
+     case MRG_SCROLL_DIRECTION_UP:
+       zoom_at (data1, event->device_x, event->device_y, 1.05);
+       break;
+     default:
+       break;
+  }
 }
 
 static void toggle_actions_cb (MrgEvent *event, void *data1, void *data2)