[gnome-music/wip/mschraal/backbutton: 2/2] window: Enable back mouse button to navigate backwards

[Marinus Schraal <mschraal src gnome org>]

commit e8b554ced46363978f3ef66158273efe5ddc1843
Author: theawless <thawless gmail com>
Date:   Sat Jan 14 04:03:57 2017 +0530

    window: Enable back mouse button to navigate backwards
    
    Creates the same effect as having pressed "Alt+Left" combination.
    Override button_release_event to handle mouse button 8.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=771934

 gnomemusic/window.py | 11 +++++++++++
 1 file changed, 11 insertions(+)
---
diff --git a/gnomemusic/window.py b/gnomemusic/window.py
index f0fba83..7b269f6 100644
--- a/gnomemusic/window.py
+++ b/gnomemusic/window.py
@@ -474,6 +474,17 @@ class Window(Gtk.ApplicationWindow):
             self.toolbar.searchbar.show_bar(True)
 
     @log
+    def do_button_release_event(self, event):
+        """Override default button release event
+
+        :param Gdk.EventButton event: Button event
+        """
+        __, code = event.get_button()
+        # Mouse button 8 is the navigation button
+        if code == 8:
+            self.toolbar.on_back_button_clicked()
+
+    @log
     def _notify_mode_disconnect(self, data=None):
         self.player.Stop()
         self._stack.disconnect(self._on_notify_model_id)