[iagno] Add transitions

[Michael Catanzaro <mcatanzaro src gnome org>]

commit 1320c40ade03711bbad6bede4d13b500902e70b7
Author: Arnaud Bonatti <arnaud bonatti gmail com>
Date:   Wed Sep 24 23:30:12 2014 +0200

    Add transitions
    
    https://bugzilla.gnome.org/show_bug.cgi?id=664976

 data/iagno.ui  |    1 +
 src/iagno.vala |    3 +++
 2 files changed, 4 insertions(+), 0 deletions(-)
---
diff --git a/data/iagno.ui b/data/iagno.ui
index 075c10f..01f0b41 100644
--- a/data/iagno.ui
+++ b/data/iagno.ui
@@ -57,6 +57,7 @@
       <object class="GtkStack" id="main_stack">
         <property name="visible">True</property>
         <property name="homogeneous">True</property>
+        <property name="transition-duration">800</property>
         <child>
           <object class="GtkBox" id="start-box">
             <property name="orientation">vertical</property>
diff --git a/src/iagno.vala b/src/iagno.vala
index 1a86404..b81e752 100644
--- a/src/iagno.vala
+++ b/src/iagno.vala
@@ -293,12 +293,14 @@ public class Iagno : Gtk.Application
 
     private void start_game_cb ()
     {
+        main_stack.set_transition_type (Gtk.StackTransitionType.SLIDE_DOWN);
         back_button.visible = false;
         start_game ();
     }
 
     private void back_cb ()
     {
+        main_stack.set_transition_type (Gtk.StackTransitionType.SLIDE_RIGHT);
         show_game_board ();
         back_action.set_enabled (false);
 
@@ -326,6 +328,7 @@ public class Iagno : Gtk.Application
 
     private void new_game_cb ()
     {
+        main_stack.set_transition_type (Gtk.StackTransitionType.SLIDE_LEFT);
         show_new_game_screen ();
         headerbar.set_subtitle (null);
         back_button.visible = true;