wx.TextCtrl 和 wx.Validator

Question

我需要用 wx.Textvalidator 来验证文本框的内容。谁能帮我一下？

我该怎么用 wx.FILTER_ALPHA 来配合验证器，如果用户输入错误，我该怎么给他们提示信息呢？

我需要在点击保存按钮时验证所有的输入内容。

有没有人能给我一个示例代码呢？

Answer 1

我在自己的代码里没法让示例代码正常工作（我没有使用对话框，而是在一个面板里用了一个文本框），尽管在演示中它是可以正常运行的（真是让人费解）。

最后我用了另一个网站上的一段代码，觉得有必要在这里记录一下：

self.tc.GetValidator().Validate(self.tc)

这是我唯一能让自定义验证器代码被调用的方法。调用 self.tc.Validate() 完全没用，self.Validate() 也不行，传递窗口作为参数也没有效果。

参考链接： 链接文本

Answer 2

有很多方法可以做到这一点。wxPython的示例演示了如何只允许输入数字或字母。下面是一个基于这个示例的例子：

import wx
import string

########################################################################
class CharValidator(wx.PyValidator):
    ''' Validates data as it is entered into the text controls. '''

    #----------------------------------------------------------------------
    def __init__(self, flag):
        wx.PyValidator.__init__(self)
        self.flag = flag
        self.Bind(wx.EVT_CHAR, self.OnChar)

    #----------------------------------------------------------------------
    def Clone(self):
        '''Required Validator method'''
        return CharValidator(self.flag)

    #----------------------------------------------------------------------
    def Validate(self, win):
        return True

    #----------------------------------------------------------------------
    def TransferToWindow(self):
        return True

    #----------------------------------------------------------------------
    def TransferFromWindow(self):
        return True

    #----------------------------------------------------------------------
    def OnChar(self, event):
        keycode = int(event.GetKeyCode())
        if keycode < 256:
            #print keycode
            key = chr(keycode)
            #print key
            if self.flag == 'no-alpha' and key in string.letters:
                return
            if self.flag == 'no-digit' and key in string.digits:
                return
        event.Skip()

########################################################################
class ValidationDemo(wx.Frame):
    """"""

    #----------------------------------------------------------------------
    def __init__(self):
        """Constructor"""
        wx.Frame.__init__(self, None, wx.ID_ANY, 
                          "Text Validation Tutorial")

        panel = wx.Panel(self)
        textOne = wx.TextCtrl(panel, validator=CharValidator('no-alpha'))
        textTwo = wx.TextCtrl(panel, validator=CharValidator('no-digit'))

        sizer = wx.BoxSizer(wx.VERTICAL)
        sizer.Add(textOne, 0, wx.ALL, 5)
        sizer.Add(textTwo, 0, wx.ALL, 5)
        panel.SetSizer(sizer)

# Run the program
if __name__ == "__main__":
    app = wx.App(False)
    frame = ValidationDemo()
    frame.Show()
    app.MainLoop()

另一种方法是使用带有掩码的控件，这个可以通过wx.lib.masked来实现。wxPython的示例中也有相关的例子。

Answer 3

这是wxWidgets的一个功能，但在wxPython中并没有实现。

http://www.wxpython.org/docs/api/wx.TextValidator-class.html - 找不到这个链接

而在这里：

http://docs.wxwidgets.org/trunk/classwx_text_validator.html http://docs.wxwidgets.org/stable/wx_wxtextvalidator.html

在wxPython的演示中，有关于验证器的示例：

import wx

class TextObjectValidator(wx.PyValidator):
     """ This validator is used to ensure that the user has entered something
         into the text object editor dialog's text field.
     """
     def __init__(self):
         """ Standard constructor.
         """
         wx.PyValidator.__init__(self)



     def Clone(self):
         """ Standard cloner.

             Note that every validator must implement the Clone() method.
         """
         return TextObjectValidator()


     def Validate(self, win):
         """ Validate the contents of the given text control.
         """
         textCtrl = self.GetWindow()
         text = textCtrl.GetValue()

         if len(text) == 0:
             wx.MessageBox("A text object must contain some text!", "Error")
             textCtrl.SetBackgroundColour("pink")
             textCtrl.SetFocus()
             textCtrl.Refresh()
             return False
         else:
             textCtrl.SetBackgroundColour(
                 wx.SystemSettings_GetColour(wx.SYS_COLOUR_WINDOW))
             textCtrl.Refresh()
             return True


     def TransferToWindow(self):
         """ Transfer data from validator to window.

             The default implementation returns False, indicating that an error
             occurred.  We simply return True, as we don't do any data transfer.
         """
         return True # Prevent wxDialog from complaining.


     def TransferFromWindow(self):
         """ Transfer data from window to validator.

             The default implementation returns False, indicating that an error
             occurred.  We simply return True, as we don't do any data transfer.
         """
         return True # Prevent wxDialog from complaining.

#----------------------------------------------------------------------

class TestValidateDialog(wx.Dialog):
    def __init__(self, parent):
        wx.Dialog.__init__(self, parent, -1, "Validated Dialog")

        self.SetAutoLayout(True)
        VSPACE = 10

        fgs = wx.FlexGridSizer(0, 2)

        fgs.Add((1,1));
        fgs.Add(wx.StaticText(self, -1,
                             "These controls must have text entered into them.  Each\n"
                             "one has a validator that is checked when the Okay\n"
                             "button is clicked."))

        fgs.Add((1,VSPACE)); fgs.Add((1,VSPACE))

        label = wx.StaticText(self, -1, "First: ")
        fgs.Add(label, 0, wx.ALIGN_RIGHT|wx.CENTER)

        fgs.Add(wx.TextCtrl(self, -1, "", validator = TextObjectValidator()))

        fgs.Add((1,VSPACE)); fgs.Add((1,VSPACE))

        label = wx.StaticText(self, -1, "Second: ")
        fgs.Add(label, 0, wx.ALIGN_RIGHT|wx.CENTER)
        fgs.Add(wx.TextCtrl(self, -1, "", validator = TextObjectValidator()))


        buttons = wx.StdDialogButtonSizer() #wx.BoxSizer(wx.HORIZONTAL)
        b = wx.Button(self, wx.ID_OK, "OK")
        b.SetDefault()
        buttons.AddButton(b)
        buttons.AddButton(wx.Button(self, wx.ID_CANCEL, "Cancel"))
        buttons.Realize()

        border = wx.BoxSizer(wx.VERTICAL)
        border.Add(fgs, 1, wx.GROW|wx.ALL, 25)
        border.Add(buttons)
        self.SetSizer(border)
        border.Fit(self)
        self.Layout()



app = wx.App(redirect=False)
f = wx.Frame(parent=None)
f.Show()
dlg = TestValidateDialog(f)
dlg.ShowModal()
dlg.Destroy()

app.MainLoop()