[pybliographer] ui: Migrate warning dialog from gnome to gtk

[Germán Poo-Caamaño <gpoo src gnome org>]

commit 205e28c1e5e94350d68fe61da808b66fed4c8419
Author: Germán Poo-Caamaño <gpoo gnome org>
Date:   Sat Mar 24 17:57:11 2018 -0300

    ui: Migrate warning dialog from gnome to gtk

 Pyblio/GnomeUI/Config.py |    9 ++++-----
 Pyblio/GnomeUI/Fields.py |    6 ++----
 Pyblio/GnomeUI/Utils.py  |   11 +++++++++++
 3 files changed, 17 insertions(+), 9 deletions(-)
---
diff --git a/Pyblio/GnomeUI/Config.py b/Pyblio/GnomeUI/Config.py
index 2d8628c..24a87e9 100644
--- a/Pyblio/GnomeUI/Config.py
+++ b/Pyblio/GnomeUI/Config.py
@@ -56,7 +56,7 @@ class ConfigDialog (Utils.GladeWindow):
 ##      tooltips = gtk.Tooltips ()
 ##      tooltips.enable ()
         
-        self.warning = 0
+        self.warning = False
         self.parent = parent
         
         domains = Config.domains ()
@@ -142,10 +142,9 @@ class ConfigDialog (Utils.GladeWindow):
         
     def changed (self):
         if not self.warning:
-            self.warning = 1
-            self.parent.warning (
-                _("Some changes require to restart Pybliographic\n"
-                  "to be correctly taken into account"))
+            self.warning = True
+            Utils.warning_dialog_s(self.parent, _("Some changes require to restart Pybliographic\n"
+                                   "to be correctly taken into account"))
 
 
 class BaseConfig:
diff --git a/Pyblio/GnomeUI/Fields.py b/Pyblio/GnomeUI/Fields.py
index b8c5ec3..524794a 100644
--- a/Pyblio/GnomeUI/Fields.py
+++ b/Pyblio/GnomeUI/Fields.py
@@ -63,7 +63,7 @@ class FieldsDialog (Utils.GladeWindow):
 ##      tooltips = gtk.Tooltips ()
 ##      tooltips.enable ()
         
-        self.warning = 0
+        self.warning = False
         self.parent = parent
         self.init_page_1()
         self.init_page_2()
@@ -414,10 +414,8 @@ class FieldsDialog (Utils.GladeWindow):
         Config.set_and_save ('base/fields', result)
 
         if self.parent:
-            self.parent.warning (_("Some changes require to restart Pybliographic\n"
+            Utils.warning_dialog_s(self.parent, _("Some changes require to restart Pybliographic\n"
                                    "to be correctly taken into account"))
-        return
-
 
     def add_cb (self, * arg):
         name = string.strip (self.name.get_text ())
diff --git a/Pyblio/GnomeUI/Utils.py b/Pyblio/GnomeUI/Utils.py
index ff52231..ef83a66 100644
--- a/Pyblio/GnomeUI/Utils.py
+++ b/Pyblio/GnomeUI/Utils.py
@@ -228,3 +228,14 @@ def error_dialog_s(parent, primary, secondary=None):
         dialog.format_secondary_text(secondary)
     dialog.run()
     dialog.destroy()
+
+
+def warning_dialog_s(parent, primary, secondary=None):
+    dialog = Gtk.MessageDialog(parent,
+                               Gtk.DialogFlags.MODAL | Gtk.DialogFlags.DESTROY_WITH_PARENT,
+                               Gtk.MessageType.WARNING,
+                               Gtk.ButtonsType.CLOSE, primary)
+    if secondary:
+        dialog.format_secondary_text(secondary)
+    dialog.run()
+    dialog.destroy()