[gnome-music/wip/mschraal/player-factor-out-gstreamer] Move duration calc to smoothscale

[Marinus Schraal <mschraal src gnome org>]

commit 768471022c801ba8c81fe0c2b09da35149946f8c
Author: Marinus Schraal <mschraal gnome org>
Date:   Sun Feb 18 16:31:24 2018 +0100

    Move duration calc to smoothscale

 gnomemusic/player.py              | 5 -----
 gnomemusic/widgets/smoothscale.py | 9 +++++++++
 2 files changed, 9 insertions(+), 5 deletions(-)
---
diff --git a/gnomemusic/player.py b/gnomemusic/player.py
index 23f7f11..d040897 100644
--- a/gnomemusic/player.py
+++ b/gnomemusic/player.py
@@ -369,7 +369,6 @@ class Player(GObject.GObject):
 
     @log
     def load(self, media):
-        self._set_duration(media.get_duration())
         self._total_time_label.set_label(
             utils.seconds_to_string(media.get_duration()))
 
@@ -679,10 +678,6 @@ class Player(GObject.GObject):
     def _on_prev_button_clicked(self, button):
         self.play_previous()
 
-    @log
-    def _set_duration(self, duration):
-        self._progress_scale.set_range(0.0, duration * 60)
-
     @log
     def _sync_repeat_image(self):
         icon = None
diff --git a/gnomemusic/widgets/smoothscale.py b/gnomemusic/widgets/smoothscale.py
index 0bb1093..ef59461 100644
--- a/gnomemusic/widgets/smoothscale.py
+++ b/gnomemusic/widgets/smoothscale.py
@@ -74,6 +74,7 @@ class SmoothScale(Gtk.Scale):
         self._player = player
 
         self._player.connect('notify::state', self._on_state_change)
+        self._player.connect('notify::duration', self._on_duration_changed)
 
     @log
     def _on_state_change(self, klass, arguments):
@@ -94,6 +95,13 @@ class SmoothScale(Gtk.Scale):
 
         return True
 
+    @log
+    def _on_duration_changed(self, klass, arguments):
+        duration = self._player.duration
+
+        if duration is not None:
+            self.set_range(0.0, duration * 60)
+
     def _on_progress_scale_seek_finish(self, value):
         """Prevent stutters when seeking with infinitesimal amounts"""
         self._seek_timeout = None
@@ -142,6 +150,7 @@ class SmoothScale(Gtk.Scale):
         return False
 
     def _on_progress_scale_draw(self, cr, data):
+        self._on_duration_changed(None, None)
         self._update_timeout()
         self.disconnect(self._ps_draw)
         return False