Implement the transition between zoom view.

sugar/graphics/animator.py

@@ -39,6 +39,10 @@ class Animator(gobject.GObject):
     def add(self, animation):
         self._animations.append(animation)
 
+    def remove_all(self):
+        self.stop()
+        self._animations = []
+
     def start(self):
         if self._timeout_sid:
             self.stop()
@@ -51,7 +55,7 @@ class Animator(gobject.GObject):
         if self._timeout_sid:
             gobject.source_remove(self._timeout_sid)
             self._timeout_sid = 0
-        self.emit('completed')
+            self.emit('completed')
 
     def _next_frame_cb(self):
         current_time = min(self._time, time.time() - self._start_time)