wxPython 验证器无法按预期工作

Question

我在wxPython中写了一个对话框，里面有两个下拉框，并且我给它们加了一个自定义的验证器，目的是确保如果输入了值，那这个值必须是数字字符串。问题是，这些验证器没有被调用。我哪里做错了呢？

    import wx

    # my custom validator class

    class NumericObjectValidator(wx.Validator):
       def __init__(self):
          wx.Validator.__init__(self)

       def Clone(self):
          return NumericObjectValidator()

       # Why isn't this method being called when the user types in the CB field?
       def Validate(self, win):
          cbCtrl = self.GetWindow()
          text = cbCtrl.GetValue()
          print 'control value=',text
          return True

    class SizeDialog(wx.Dialog):
       def __init__(self, parent):
          wx.Dialog.__init__(self, parent, -1, 'Select Size', size=(200,135))

          panel = wx.Panel(self, -1, size=self.GetClientSize())

          sizes = map(str, range(3,21))
          wx.StaticText(panel, -1, 'Rows:', pos=(10, 15))
          self.rows = wx.ComboBox(panel, -1, value='8', choices=sizes,
             style=wx.CB_DROPDOWN, pos=(80,15), validator=NumericObjectValidator())

          wx.StaticText(panel, -1, 'Columns:', pos=(10,40))
          self.cols = wx.ComboBox(panel, -1, choices=sizes, style=wx.CB_DROPDOWN,
             pos=(80,40), value='8', validator=NumericObjectValidator())

          cancel = wx.Button(panel,wx.ID_CANCEL,'Cancel', pos=(20,75))
          wx.Button(panel,wx.ID_OK,'OK', pos=(100,75)).SetDefault()

       def TransferToWindow(self):
          return True

       def TransferFromWindow(self):
          return True

       def get_size(self):
          r = int(self.rows.GetValue())
          c = int(self.cols.GetValue())
          return (c,r)

    if __name__ == "__main__":
       app = wx.App(0)
       dlg = SizeDialog(None)
       dlg.ShowModal()
       dlg.Destroy()

Answer 1

1. 用 PyValidator 代替 Validator
2. 你的 ComboBox 和 Button 的父级应该是 Dialog，而不是 Panel

下面这个版本的代码应该能正常工作：

    import wx

    # my custom validator class

    class NumericObjectValidator(wx.PyValidator):

        def __init__(self):
            wx.PyValidator.__init__(self)

        def Clone(self):
            return NumericObjectValidator()

        # Why isn't this method being called when the user types in the CB
        # field?
        def Validate(self, win):
            cbCtrl = self.GetWindow()
            text = cbCtrl.GetValue()
            print 'control value=', text
            return True

        def TransferToWindow(self):
            return True

        def TransferFromWindow(self):
            return True

    class SizeDialog(wx.Dialog):

        def __init__(self, parent):
            wx.Dialog.__init__(
                self, parent, -1, 'Select Size', size=(200, 135))

            sizes = map(str, range(3, 21))
            wx.StaticText(self, -1, 'Rows:', pos=(10, 15))
            self.rows = wx.ComboBox(self, -1, value='8', choices=sizes,
                                    style=wx.CB_DROPDOWN, pos=(80, 15), validator=NumericObjectValidator())

            wx.StaticText(self, -1, 'Columns:', pos=(10, 40))
            self.cols = wx.ComboBox(
                self, -1, choices=sizes, style=wx.CB_DROPDOWN,
                pos=(80, 40), value='8', validator=NumericObjectValidator())

            cancel = wx.Button(self, wx.ID_CANCEL, 'Cancel', pos=(20, 75))
            wx.Button(self, wx.ID_OK, 'OK', pos=(100, 75)).SetDefault()

        def get_size(self):
            r = int(self.rows.GetValue())
            c = int(self.cols.GetValue())
            return (c, r)

    if __name__ == "__main__":
        app = wx.App(0)
        dlg = SizeDialog(None)
        dlg.ShowModal()
        dlg.Destroy()

Answer 2

我也不知道为什么，但是复制这个 wxPython示例 是没问题的。

import wx
import string

# my custom validator class

class NumericObjectValidator(wx.PyValidator):
    def __init__(self):
        wx.PyValidator.__init__(self)
        self.Bind(wx.EVT_CHAR, self.OnChar)

    def Clone(self):
        return NumericObjectValidator()

    def Validate(self, win):
        tc = self.GetWindow()
        val = tc.GetValue()

        for x in val:
            if x not in string.digits:
                return False

        return True


    def OnChar(self, event):
        key = event.GetKeyCode()

        if key < wx.WXK_SPACE or key == wx.WXK_DELETE or key > 255:
            event.Skip()
            return

        if chr(key) in string.digits:
            event.Skip()

        return


class SizeDialog(wx.Dialog):
   def __init__(self, parent):
      wx.Dialog.__init__(self, parent, -1, 'Select Size', size=(200,135))

      panel = wx.Panel(self, -1, size=self.GetClientSize())

      sizes = map(str, range(3,21))
      wx.StaticText(panel, -1, 'Rows:', pos=(10, 15))
      self.rows = wx.ComboBox(panel, -1, value='8', choices=sizes,
         style=wx.CB_DROPDOWN, pos=(80,15), validator=NumericObjectValidator())

      wx.StaticText(panel, -1, 'Columns:', pos=(10,40))
      self.cols = wx.ComboBox(panel, -1, style=wx.CB_DROPDOWN, validator=NumericObjectValidator())

      cancel = wx.Button(panel,wx.ID_CANCEL,'Cancel', pos=(20,75))
      wx.Button(panel,wx.ID_OK,'OK', pos=(100,75)).SetDefault()

   def TransferToWindow(self):
      return True

   def TransferFromWindow(self):
      return True

   def get_size(self):
      r = int(self.rows.GetValue())
      c = int(self.cols.GetValue())
      return (c,r)

if __name__ == "__main__":
   app = wx.App(0)
   dlg = SizeDialog(None)
   dlg.ShowModal()
   dlg.Destroy()

Answer 3

这是wxWidgets中的一个小问题。如果父窗口不是wx.Dialog的子类，你就需要手动调用“TransferDataToWindow”和“TransferDataFromWindow”这两个方法来进行数据传输。在这里，你使用wx.Panel作为下拉框的父窗口，所以数据传输不会自动进行。