[gnome-chess] Add a warning dialog when using Resign

[Michael Catanzaro <mcatanzaro src gnome org>]

commit 45cf7b0bf55d479efeea2d8f4cd2e3ddf10e342b
Author: Michael Catanzaro <mcatanzaro gnome org>
Date:   Mon Apr 7 20:11:29 2014 -0500

    Add a warning dialog when using Resign
    
    https://bugzilla.gnome.org/show_bug.cgi?id=727788

 src/gnome-chess.vala |   32 +++++++++++++++++++++++++++++---
 1 files changed, 29 insertions(+), 3 deletions(-)
---
diff --git a/src/gnome-chess.vala b/src/gnome-chess.vala
index dd0e515..e4f3992 100644
--- a/src/gnome-chess.vala
+++ b/src/gnome-chess.vala
@@ -1322,10 +1322,36 @@ public class Application : Gtk.Application
 
     public void resign_cb ()
     {
-        if (human_player != null)
-            human_player.resign ();
+        /* Manually since we don't want to show the pause overlay */
+        if (game.clock != null)
+            game.clock.pause ();
+
+        var dialog = new Gtk.MessageDialog (window,
+                                            Gtk.DialogFlags.MODAL,
+                                            Gtk.MessageType.QUESTION,
+                                            Gtk.ButtonsType.NONE,
+                                            _("Are you sure you want to resign?"));
+        dialog.format_secondary_text (
+            _("This makes sense if you plan to save the game as a record of your loss."));
+        dialog.add_buttons (_("_Keep Playing"), Gtk.ResponseType.REJECT,
+                            _("_Resign"), Gtk.ResponseType.ACCEPT,
+                            null);
+
+        var response = dialog.run ();
+        dialog.destroy ();
+
+        if (response == Gtk.ResponseType.ACCEPT)
+        {
+            if (human_player != null)
+                human_player.resign ();
+            else
+                game.current_player.resign ();
+        }
         else
-            game.current_player.resign ();
+        {
+            if (game.clock != null)
+                game.clock.unpause ();
+        }
     }
 
     public void claim_draw_cb ()