--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dialogs/MessageBoxOnce.py	Mon Aug 08 18:09:26 2022 +0200
@@ -0,0 +1,57 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+# This file is part of Beremiz
+# Copyright (C) 2022: Edouard TISSERANT
+#
+# See COPYING file for copyrights details.
+
+
+from __future__ import absolute_import
+import wx
+
+
+# class RichMessageDialog is still not available in wxPython 3.0.2
+class  MessageBoxOnce(wx.Dialog):
+    """
+    wx.MessageBox that user can ask not to show again
+    """
+    def __init__(self, title, message, config_key):
+        self.Config = wx.ConfigBase.Get()
+        self.config_key = config_key
+        dont_show = self.Config.Read(self.config_key) == "True"
+
+        if dont_show:
+            return
+
+        wx.Dialog.__init__(self, None, title=title)
+
+        main_sizer = wx.BoxSizer(wx.VERTICAL)
+
+        message = wx.StaticText(self, label=message)
+        main_sizer.Add(message, border=20,
+            flag=wx.ALIGN_CENTER_HORIZONTAL | wx.TOP | wx.LEFT | wx.RIGHT)
+
+        self.check = wx.CheckBox(self, label=_("don't show this message again"))
+        main_sizer.Add(self.check, border=20,
+            flag=wx.LEFT | wx.RIGHT | wx.BOTTOM | wx.ALIGN_CENTER_HORIZONTAL)
+
+        buttons_sizer = wx.BoxSizer(wx.HORIZONTAL)
+
+        Button = wx.Button(self, label="OK")
+
+        self.Bind(wx.EVT_BUTTON, self.OnOKButton, Button)
+        buttons_sizer.Add(Button)
+
+        main_sizer.Add(buttons_sizer, border=20,
+                            flag=wx.LEFT | wx.RIGHT | wx.BOTTOM | wx.ALIGN_RIGHT)
+
+        self.SetSizer(main_sizer)
+        self.Fit()
+
+        self.ShowModal()
+
+    def OnOKButton(self, event):
+        if self.check.GetValue():
+            self.Config.Write(self.config_key, "True")
+        self.EndModal(wx.ID_OK)