[pitivi/ges: 93/287] utils: Add a togglePipeline utility function

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

commit 5031f34001af5bf22d7871e6bf2a9d1cc472daf7
Author: Thibault Saunier <thibault saunier collabora com>
Date:   Wed Dec 14 13:10:55 2011 -0300

    utils: Add a togglePipeline utility function
    
        Make use of it in the viewer

 pitivi/ui/viewer.py |   22 +++++-----------------
 pitivi/utils.py     |   17 +++++++++++++++++
 2 files changed, 22 insertions(+), 17 deletions(-)
---
diff --git a/pitivi/ui/viewer.py b/pitivi/ui/viewer.py
index 7668d0c..d6f05d8 100644
--- a/pitivi/ui/viewer.py
+++ b/pitivi/ui/viewer.py
@@ -29,7 +29,7 @@ import cairo
 
 from gettext import gettext as _
 
-from pitivi.utils import time_to_string
+from pitivi.utils import time_to_string, togglePlayback
 from pitivi.log.loggable import Loggable
 from pitivi.ui.common import SPACING, hex_to_rgb
 from pitivi.settings import GlobalSettings
@@ -488,12 +488,7 @@ class PitiviViewer(gtk.VBox, Loggable):
         self.seekRelative(0 - gst.SECOND)
 
     def _playButtonCb(self, unused_button, playing):
-        if playing:
-            self.playing = True
-            self.pipeline.set_state(gst.STATE_PLAYING)
-        else:
-            self.playing = False
-            self.pipeline.set_state(gst.STATE_PAUSED)
+        self.togglePlayback()
 
     def _forwardCb(self, unused_button):
         self.seekRelative(gst.SECOND)
@@ -520,16 +515,9 @@ class PitiviViewer(gtk.VBox, Loggable):
         self.pipeline.pause()
 
     def togglePlayback(self):
-        if self.pipeline is None:
-            return
-
-        if int(self.pipeline.get_state()[1]) == int(gst.STATE_PLAYING):
-            state = gst.STATE_PAUSED
-            self.playpause_button.setPause()
-        else:
-            self.playpause_button.setPlay()
-            state = gst.STATE_PLAYING
-        self.pipeline.set_state(state)
+        if self.pipeline:
+            state = togglePlayback(self.pipeline)
+            self.playing = (state == gst.STATE_PLAYING)
 
     def undock(self):
         if not self.undock_action:
diff --git a/pitivi/utils.py b/pitivi/utils.py
index 80223dd..9de4a1c 100644
--- a/pitivi/utils.py
+++ b/pitivi/utils.py
@@ -532,3 +532,20 @@ def show_user_manual():
             continue
     log.warning("utils", "Failed loading URIs")
     # TODO: Show an error message to the user.
+
+
+#-----------------------------------------------------------------------------#
+#                   Pipeline utils                                            #
+def togglePlayback(pipeline):
+    if int(pipeline.get_state()[1]) == int(gst.STATE_PLAYING):
+        state = gst.STATE_PAUSED
+    else:
+        state = gst.STATE_PLAYING
+
+    res = pipeline.set_state(state)
+    if res == gst.STATE_CHANGE_FAILURE:
+        gst.error("Could no set state to %s")
+        state = gst.STATE_NULL
+        pipeline.set_state(state)
+
+    return state