[pitivi] utils/widgets: Fill sliders with color to indicate the default values

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

commit d9f5364873ae4933e3d3d0dad779f5d79f0fa88c
Author: Jean-François Fortin Tam <nekohayo gmail com>
Date:   Tue Jul 23 21:10:56 2013 -0400

    utils/widgets: Fill sliders with color to indicate the default values
    
    This provides a visual indication of which numeric values the user has changed.

 pitivi/utils/widgets.py |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)
---
diff --git a/pitivi/utils/widgets.py b/pitivi/utils/widgets.py
index dcab7db..d1a9438 100644
--- a/pitivi/utils/widgets.py
+++ b/pitivi/utils/widgets.py
@@ -224,6 +224,12 @@ class NumericWidget(Gtk.HBox, DynamicWidget):
             self.pack_start(self.slider, fill=True, expand=True, padding=0)
             self.slider.show()
             self.slider.props.draw_value = False
+            # Abuse GTK3's progressbar "fill level" feature to provide
+            # a visual indication of the default value on property sliders.
+            if default is not None:
+                self.slider.set_restrict_to_fill_level(False)
+                self.slider.set_fill_level(float(default))
+                self.slider.set_show_fill_level(True)
 
         if upper is None:
             upper = GObject.G_MAXDOUBLE