text: # Copyright (C) 2002-2021 S[&]T, The Netherlands.
  # All rights reserved.
  #
  # Redistribution and use in source and binary forms, with or without
  # modification, are permitted provided that the following conditions are met:
  #
  # 1. Redistributions of source code must retain the above copyright notice,
  # this list of conditions and the following disclaimer.
  #
  # 2. Redistributions in binary form must reproduce the above copyright
  # notice, this list of conditions and the following disclaimer in the
  # documentation and/or other materials provided with the distribution.
  #
  # 3. Neither the name of the copyright holder nor the names of its
  # contributors may be used to endorse or promote products derived from
  # this software without specific prior written permission.
  #
  # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  # AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  # IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  # ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
  # LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  # CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  # SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  # INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  # CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  # ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  # POSSIBILITY OF SUCH DAMAGE.
  
  import wx
  
  
  class FloatValidator(wx.Validator):
  
      def __init__(self):
          super(FloatValidator, self).__init__()
          self.Bind(wx.EVT_CHAR, self.OnChar)
          self.floatchars = '0123456789-+.eE'
  
      def Clone(self):
          return FloatValidator()
  
      def OnChar(self, event):
          key = event.KeyCode
          if key < wx.WXK_SPACE or key == wx.WXK_DELETE or key > 255:
              event.Skip()
              return
  
          if chr(key) in self.floatchars:
              event.Skip()
              return
  
          if not wx.Validator_IsSilent():
              wx.Bell()
  
          return
  
  
  class DigitValidator(wx.Validator):
  
      def __init__(self):
          super(DigitValidator, self).__init__()
          self.Bind(wx.EVT_CHAR, self.OnChar)
          self.digits = '0123456789'
  
      def Clone(self):
          return DigitValidator()
  
      def OnChar(self, event):
          key = event.KeyCode
          if key < wx.WXK_SPACE or key == wx.WXK_DELETE or key > 255:
              event.Skip()
              return
  
          if chr(key) in self.digits:
              event.Skip()
              return
  
          if not wx.Validator_IsSilent():
              wx.Bell()
  
          return
  