[billreminder] a simple function to avoid modality, but keep one window per instance

[Toms Baugis <tbaugis src gnome org>]

commit a762a7b1b76836a6e919fe39e6b2bb26f66761a8
Author: Toms Bauģis <toms baugis gmail com>
Date:   Sun Nov 29 13:15:51 2009 +0000

    a simple function to avoid modality, but keep one window per instance

 src/lib/dialogs.py |   34 ++++++++++++++++++++++++----------
 1 files changed, 24 insertions(+), 10 deletions(-)
---
diff --git a/src/lib/dialogs.py b/src/lib/dialogs.py
index 5e21e8b..ca701c1 100644
--- a/src/lib/dialogs.py
+++ b/src/lib/dialogs.py
@@ -24,19 +24,33 @@ from gui.prefdialog import PrefDialog
 from gui.categoriesdialog import CategoriesDialog
 from lib import i18n
 
-def about_dialog(parent=None):
-    about = AboutDialog()
-    ret = about.run()
-    about.destroy()
 
-    return ret
+class OneWindow(object):
+    def __init__(self, dialog_class):
+        self.dialog = None
+        self.dialog_class = dialog_class
+    
+    def on_dialog_destroy(self):
+        self.dialog = None
 
-def preferences_dialog(parent=None):
-    pref = PrefDialog(parent=parent)
-    ret = pref.run()
-    pref.destroy()
+    def show(self, parent = None):
+        if self.dialog:
+            self.dialog.present()
+        else:
+            if parent:
+                self.dialog = self.dialog_class(parent)
+            else:
+                self.dialog = self.dialog_class()
+            self.dialog.connect("destroy", lambda *args: self.on_dialog_destroy())
 
-    return ret
+about = OneWindow(AboutDialog)
+prefs = OneWindow(PrefDialog)
+
+def about_dialog(parent=None):
+    about.show(parent)
+
+def preferences_dialog(parent=None):
+    prefs.show(parent)
 
 def categories_dialog(parent=None):
     categories = CategoriesDialog(parent=parent)