[pitivi] interpolator: add keyframe-moved signal

[Edward Hervey <edwardrv src gnome org>]

commit ebccc5b92984911560a58905aafb875246a7f5cf
Author: Brandon Lewis <brandon_lewis berkeley edu>
Date:   Thu May 28 13:58:48 2009 -0700

    interpolator: add keyframe-moved signal

 pitivi/timeline/track.py |   13 ++++++++++++-
 1 files changed, 12 insertions(+), 1 deletions(-)
---
diff --git a/pitivi/timeline/track.py b/pitivi/timeline/track.py
index 55e262d..13b27e2 100644
--- a/pitivi/timeline/track.py
+++ b/pitivi/timeline/track.py
@@ -98,6 +98,9 @@ class Keyframe(Signallable):
 
     value = property(getValue, setValue)
 
+    def __cmp__(self, other):
+        return cmp(self.time, other.time)
+
 class FixedKeyframe(Keyframe):
 
     def setTime(self, time):
@@ -124,6 +127,7 @@ class Interpolator(Signallable):
     __signals__ = {
         'keyframe-added' : ['keyframe'],
         'keyframe-removed' : ['keyframe'],
+        'keyframe-moved' : ['keyframe'],
     }
 
     def __init__(self, trackobject, property):
@@ -200,7 +204,14 @@ class Interpolator(Signallable):
         # FIXME: uncomment this when back-end support works
         #self._controller.unset(kf.time)
         #self._controller.set(kf.time, value)
-        pass
+        self.emit("keyframe-moved", kf)
+
+    def getKeyframes(self):
+        # FIXME: make this more efficient
+        for kf in sorted(self._keyframes):
+            yield kf
+
+    keyframes = property(getKeyframes)
 
 class TrackObject(Signallable):