[pitivi] track.py: add value formatValue function, with optional format func passed in constructor

[Edward Hervey <edwardrv src gnome org>]

commit 3d780458eb3e58ef7915c7f1681ac1e35ef46fde
Author: Brandon Lewis <brandon_lewis berkeley edu>
Date:   Mon Aug 17 15:37:51 2009 -0700

    track.py: add value formatValue function, with optional format func passed in constructor

 pitivi/timeline/track.py |    7 ++++++-
 1 files changed, 6 insertions(+), 1 deletions(-)
---
diff --git a/pitivi/timeline/track.py b/pitivi/timeline/track.py
index f91a265..0f855f0 100644
--- a/pitivi/timeline/track.py
+++ b/pitivi/timeline/track.py
@@ -135,7 +135,8 @@ class Interpolator(Signallable, Loggable):
         'keyframe-moved' : ['keyframe'],
     }
 
-    def __init__(self, trackobject, element, prop, minimum=None, maximum=None):
+    def __init__(self, trackobject, element, prop, minimum=None, maximum=None,
+        format=None):
         Loggable.__init__(self)
         self.debug("track:%r, element:%r, property:%r", trackobject, element, prop)
         self._keyframes = []
@@ -167,6 +168,7 @@ class Interpolator(Signallable, Loggable):
         else:
             self.end.setObjectTime(trackobject.out_point)
         self._keyframeTimeValueChanged(self.end, self.end.time, self.end.value)
+        self.format = format if format else str
 
     def attachToElementProperty(self, prop, element):
         self._element = element
@@ -283,6 +285,9 @@ class Interpolator(Signallable, Loggable):
     def valueAt(self, time):
         return self._controller.get(self._property.name, time)
 
+    def formatValue(self, value):
+        return self.format(value)
+
     keyframes = property(getKeyframes)
 
 class TrackObject(Signallable, Loggable):