wxPython/demo/Validator.py

   1
   2 import  string
   3 import  wx
   4
   5 #----------------------------------------------------------------------
   6
   7 ALPHA_ONLY = 1
   8 DIGIT_ONLY = 2
   9
  10 class MyValidator(wx.PyValidator):
  11     def __init__(self, flag=None, pyVar=None):
  12         wx.PyValidator.__init__(self)
  13         self.flag = flag
  14         self.Bind(wx.EVT_CHAR, self.OnChar)
  15
  16     def Clone(self):
  17         return MyValidator(self.flag)
  18
  19     def Validate(self, win):
  20         tc = self.GetWindow()
  21         val = tc.GetValue()
  22
  23         if self.flag == ALPHA_ONLY:
  24             for x in val:
  25                 if x not in string.letters:
  26                     return False
  27
  28         elif self.flag == DIGIT_ONLY:
  29             for x in val:
  30                 if x not in string.digits:
  31                     return False
  32
  33         return True
  34
  35
  36     def OnChar(self, event):
  37         key = event.KeyCode()
  38
  39         if key < wx.WXK_SPACE or key == wx.WXK_DELETE or key > 255:
  40             event.Skip()
  41             return
  42
  43         if self.flag == ALPHA_ONLY and chr(key) in string.letters:
  44             event.Skip()
  45             return
  46
  47         if self.flag == DIGIT_ONLY and chr(key) in string.digits:
  48             event.Skip()
  49             return
  50
  51         if not wx.Validator_IsSilent():
  52             wx.Bell()
  53
  54         # Returning without calling even.Skip eats the event before it
  55         # gets to the text control
  56         return
  57
  58 #----------------------------------------------------------------------
  59
  60 class TestValidatorPanel(wx.Panel):
  61     def __init__(self, parent):
  62         wx.Panel.__init__(self, parent, -1)
  63         self.SetAutoLayout(True)
  64         VSPACE = 10
  65
  66         fgs = wx.FlexGridSizer(0, 2)
  67
  68         fgs.Add((1,1))
  69         fgs.Add(wx.StaticText(self, -1, "These controls have validators that limit\n"
  70                              "the type of characters that can be entered."))
  71
  72         fgs.Add((1,VSPACE)); fgs.Add((1,VSPACE))
  73
  74         label = wx.StaticText(self, -1, "Alpha Only: ")
  75         fgs.Add(label, 0, wx.ALIGN_RIGHT|wx.CENTER)
  76
  77         fgs.Add(wx.TextCtrl(self, -1, "", validator = MyValidator(ALPHA_ONLY)))
  78
  79         fgs.Add((1,VSPACE)); fgs.Add((1,VSPACE))
  80
  81         label = wx.StaticText(self, -1, "Digits Only: ")
  82         fgs.Add(label, 0, wx.ALIGN_RIGHT|wx.CENTER)
  83         fgs.Add(wx.TextCtrl(self, -1, "", validator = MyValidator(DIGIT_ONLY)))
  84
  85         fgs.Add((1,VSPACE)); fgs.Add((1,VSPACE))
  86         fgs.Add((1,VSPACE)); fgs.Add((1,VSPACE))
  87         fgs.Add((0,0))
  88         b = wx.Button(self, -1, "Test Dialog Validation")
  89         self.Bind(wx.EVT_BUTTON, self.OnDoDialog, b)
  90         fgs.Add(b)
  91
  92         border = wx.BoxSizer()
  93         border.Add(fgs, 1, wx.GROW|wx.ALL, 25)
  94         self.SetSizer(border)
  95         self.Layout()
  96
  97     def OnDoDialog(self, evt):
  98         dlg = TestValidateDialog(self)
  99         dlg.ShowModal()
 100         dlg.Destroy()
 101
 102
 103 #----------------------------------------------------------------------
 104
 105 class TextObjectValidator(wx.PyValidator):
 106      """ This validator is used to ensure that the user has entered something
 107          into the text object editor dialog's text field.
 108      """
 109      def __init__(self):
 110          """ Standard constructor.
 111          """
 112          wx.PyValidator.__init__(self)
 113
 114
 115
 116      def Clone(self):
 117          """ Standard cloner.
 118
 119              Note that every validator must implement the Clone() method.
 120          """
 121          return TextObjectValidator()
 122
 123
 124      def Validate(self, win):
 125          """ Validate the contents of the given text control.
 126          """
 127          textCtrl = self.GetWindow()
 128          text = textCtrl.GetValue()
 129
 130          if len(text) == 0:
 131              wx.MessageBox("A text object must contain some text!", "Error")
 132              textCtrl.SetBackgroundColour("pink")
 133              textCtrl.SetFocus()
 134              textCtrl.Refresh()
 135              return False
 136          else:
 137              textCtrl.SetBackgroundColour(
 138                  wx.SystemSettings_GetColour(wx.SYS_COLOUR_WINDOW))
 139              textCtrl.Refresh()
 140              return True
 141
 142
 143      def TransferToWindow(self):
 144          """ Transfer data from validator to window.
 145
 146              The default implementation returns False, indicating that an error
 147              occurred.  We simply return True, as we don't do any data transfer.
 148          """
 149          return True # Prevent wxDialog from complaining.
 150
 151
 152      def TransferFromWindow(self):
 153          """ Transfer data from window to validator.
 154
 155              The default implementation returns False, indicating that an error
 156              occurred.  We simply return True, as we don't do any data transfer.
 157          """
 158          return True # Prevent wxDialog from complaining.
 159
 160 #----------------------------------------------------------------------
 161
 162 class TestValidateDialog(wx.Dialog):
 163     def __init__(self, parent):
 164         wx.Dialog.__init__(self, parent, -1, "Validated Dialog")
 165
 166         self.SetAutoLayout(True)
 167         VSPACE = 10
 168
 169         fgs = wx.FlexGridSizer(0, 2)
 170
 171         fgs.Add((1,1));
 172         fgs.Add(wx.StaticText(self, -1,
 173                              "These controls must have text entered into them.  Each\n"
 174                              "one has a validator that is checked when the Okay\n"
 175                              "button is clicked."))
 176
 177         fgs.Add((1,VSPACE)); fgs.Add((1,VSPACE))
 178
 179         label = wx.StaticText(self, -1, "First: ")
 180         fgs.Add(label, 0, wx.ALIGN_RIGHT|wx.CENTER)
 181
 182         fgs.Add(wx.TextCtrl(self, -1, "", validator = TextObjectValidator()))
 183
 184         fgs.Add((1,VSPACE)); fgs.Add((1,VSPACE))
 185
 186         label = wx.StaticText(self, -1, "Second: ")
 187         fgs.Add(label, 0, wx.ALIGN_RIGHT|wx.CENTER)
 188         fgs.Add(wx.TextCtrl(self, -1, "", validator = TextObjectValidator()))
 189
 190
 191         buttons = wx.BoxSizer(wx.HORIZONTAL)
 192         b = wx.Button(self, wx.ID_OK, "Okay")
 193         b.SetDefault()
 194         buttons.Add(b, 0, wx.ALL, 10)
 195         buttons.Add(wx.Button(self, wx.ID_CANCEL, "Cancel"), 0, wx.ALL, 10)
 196
 197         border = wx.BoxSizer(wx.VERTICAL)
 198         border.Add(fgs, 1, wx.GROW|wx.ALL, 25)
 199         border.Add(buttons)
 200         self.SetSizer(border)
 201         border.Fit(self)
 202         self.Layout()
 203
 204
 205 #----------------------------------------------------------------------
 206
 207 def runTest(frame, nb, log):
 208     win = TestValidatorPanel(nb)
 209     return win
 210
 211 #----------------------------------------------------------------------
 212
 213
 214
 215 overview = """\
 216 <html>
 217 <body>
 218 wx.Validator is the base class for a family of validator classes that mediate
 219 between a class of control, and application data.
 220
 221 <p>A validator has three major roles:
 222
 223 <p><ol>
 224 <li>to transfer data from a C++ variable or own storage to and from a control;
 225 <li>to validate data in a control, and show an appropriate error message;
 226 <li>to filter events (such as keystrokes), thereby changing the behaviour of the associated control.
 227 </ol>
 228 <p>Validators can be plugged into controls dynamically.
 229 </body>
 230 </html>
 231 """
 232
 233
 234
 235 if __name__ == '__main__':
 236     import sys,os
 237     import run
 238     run.main(['', os.path.basename(sys.argv[0])] + sys.argv[1:])
 239