[gnome-nibbles/wip/vala] Add new game confirmation dialog

[Iulian Radu <iulianradu src gnome org>]

commit 93d43e5b0ec4b19dd94d298ef1e268ecbb23f4b5
Author: Iulian Radu <iulian radu67 gmail com>
Date:   Tue Aug 11 16:54:38 2015 +0300

    Add new game confirmation dialog

 data/nibbles.ui        |    2 +-
 src/gnome-nibbles.vala |   30 +++++++++++++++++++++++++++++-
 2 files changed, 30 insertions(+), 2 deletions(-)
---
diff --git a/data/nibbles.ui b/data/nibbles.ui
index f529fd0..d7ca255 100644
--- a/data/nibbles.ui
+++ b/data/nibbles.ui
@@ -9,7 +9,7 @@
                 <property name="visible">False</property>
                 <property name="use-underline">True</property>
                 <property name="label" translatable="yes">_New Game</property>
-                <property name="action-name">app.show-new-game-screen</property>
+                <property name="action-name">app.new-game</property>
             </object>
         </child>
     </object>
diff --git a/src/gnome-nibbles.vala b/src/gnome-nibbles.vala
index 2a85713..309fef9 100644
--- a/src/gnome-nibbles.vala
+++ b/src/gnome-nibbles.vala
@@ -57,6 +57,7 @@ public class Nibbles : Gtk.Application
     private const ActionEntry action_entries[] =
     {
         {"start-game", start_game_cb},
+        {"new-game", new_game_cb},
         {"scores", scores_cb},
         {"quit", quit}
     };
@@ -299,6 +300,8 @@ public class Nibbles : Gtk.Application
                 view.name_labels.hide ();
                 countdown.set_label (COUNTDOWN_TIME.to_string ());
                 game.start ();
+
+                countdown_id = 0;
                 return Source.REMOVE;
             }
             seconds--;
@@ -323,6 +326,27 @@ public class Nibbles : Gtk.Application
         start_game_with_countdown ();
     }
 
+    private void new_game_cb ()
+    {
+        var dialog = new Gtk.MessageDialog (window,
+                                            Gtk.DialogFlags.MODAL,
+                                            Gtk.MessageType.WARNING,
+                                            Gtk.ButtonsType.OK_CANCEL,
+                                            _("Are You Sure You Want to Quit?"));
+        dialog.secondary_text = _("If you start a new game, the current one will be lost.");
+
+        var button = (Gtk.Button) dialog.get_widget_for_response (Gtk.ResponseType.OK);
+        button.set_label (_("_Quit"));
+        dialog.response.connect ((response_id) => {
+            if (response_id == Gtk.ResponseType.OK)
+                show_new_game_screen_cb ();
+
+            dialog.destroy ();
+        });
+
+        dialog.show ();
+    }
+
     private void show_first_run_screen ()
     {
         main_stack.set_visible_child_name ("first_run");
@@ -340,7 +364,11 @@ public class Nibbles : Gtk.Application
             game.stop ();
 
         new_game_button.hide ();
+
+        var type = main_stack.get_transition_type ();
+        main_stack.set_transition_type (Gtk.StackTransitionType.NONE);
         main_stack.set_visible_child_name ("number_of_players");
+        main_stack.set_transition_type (type);
     }
 
     private void show_controls_screen_cb ()
@@ -377,6 +405,7 @@ public class Nibbles : Gtk.Application
     private void show_game_view ()
     {
         new_game_button.show ();
+
         main_stack.set_visible_child_name ("game_box");
     }
 
@@ -505,7 +534,6 @@ public class Nibbles : Gtk.Application
 
     public void level_completed_cb ()
     {
-        // TODO: Fix extremely big title bar
         var dialog = new Gtk.MessageDialog (window,
                                             Gtk.DialogFlags.MODAL,
                                             Gtk.MessageType.INFO,