[pitivi] timeline: Clarify what's being used in _scrollEventCb

[Jean-François Fortin Tam <jfft src gnome org>]

commit 34d172eb80891ca7bc7ccd0a564fa2de359b540c
Author: Alexandru Băluț <alexandru balut gmail com>
Date:   Wed Oct 1 20:24:34 2014 +0200

    timeline: Clarify what's being used in _scrollEventCb

 pitivi/timeline/timeline.py |   14 +++++++-------
 1 files changed, 7 insertions(+), 7 deletions(-)
---
diff --git a/pitivi/timeline/timeline.py b/pitivi/timeline/timeline.py
index 0fa5875..79ffd7c 100644
--- a/pitivi/timeline/timeline.py
+++ b/pitivi/timeline/timeline.py
@@ -1382,22 +1382,22 @@ class TimelineContainer(Gtk.Grid, Zoomable, Loggable):
         self._setBestZoomRatio(allow_zoom_in=True)
 
     def _scrollEventCb(self, unused_embed, event):
-        deltas = event.get_scroll_deltas()
+        unused_res, delta_x, delta_y = event.get_scroll_deltas()
         if event.state & Gdk.ModifierType.CONTROL_MASK:
-            if deltas[2] < 0:
+            if delta_y < 0:
                 Zoomable.zoomIn()
-            elif deltas[2] > 0:
+            elif delta_y > 0:
                 Zoomable.zoomOut()
             self._scrollToPlayhead()
         elif event.state & Gdk.ModifierType.SHIFT_MASK:
-            if deltas[2] > 0:
+            if delta_y > 0:
                 self.scroll_down()
-            elif deltas[2] < 0:
+            elif delta_y < 0:
                 self.scroll_up()
         else:
-            if deltas[2] > 0:
+            if delta_y > 0:
                 self.scroll_right()
-            elif deltas[2] < 0:
+            elif delta_y < 0:
                 self.scroll_left()
         self.scrolled += 1