Python/wxPython:如何重置wx.选择为默认值

Question

我正在处理多个wx。在wxPython中选择控件，我需要一个重置按钮来恢复默认选项"——选择——"，当点击。我无法做到这一点，我最接近的是重置为空选项，这不是我想要的。当重置按钮被按下时，我希望默认选项"——选择——"出现。请看下面的代码

data.py

import wx
class MyFrame1 ( wx.Frame ):
    def __init__( self, parent ):
        wx.Frame.__init__ ( self, parent, id = wx.ID_ANY, title = wx.EmptyString, pos = wx.DefaultPosition, size = wx.Size( 250,300 ), style = wx.CAPTION|wx.CLOSE_BOX|wx.MINIMIZE_BOX|wx.SYSTEM_MENU|wx.TAB_TRAVERSAL )
        self.SetSizeHintsSz( wx.DefaultSize, wx.DefaultSize )
        DataBox = wx.BoxSizer( wx.HORIZONTAL )
        gSizer2 = wx.GridSizer( 0, 2, 0, 0 )
        self.Color_Label = wx.StaticText( self, wx.ID_ANY, u"Color:", wx.DefaultPosition, wx.DefaultSize, 0 )
        self.Color_Label.Wrap( -1 )
        self.Color_Label.SetFont( wx.Font( 13, 70, 90, 90, False, wx.EmptyString ) )
        gSizer2.Add( self.Color_Label, 0, wx.ALL, 5 )
        Color_optionsChoices = [ u"-- Select --", u"Red", u"Green", u"Pink", u"Blue", u"Yellow", u"White", u"Brown" ]
        self.Color_options = wx.Choice( self, wx.ID_ANY, wx.DefaultPosition, wx.DefaultSize, Color_optionsChoices, 0 )
        self.Color_options.SetSelection( 0 )
        gSizer2.Add( self.Color_options, 0, wx.ALL, 5 )
        self.Age = wx.StaticText( self, wx.ID_ANY, u"Age:", wx.DefaultPosition, wx.DefaultSize, 0 )
        self.Age.Wrap( -1 )
        self.Age.SetFont( wx.Font( 13, 70, 90, 90, False, wx.EmptyString ) )
        gSizer2.Add( self.Age, 0, wx.ALL, 5 )
        Age_optionsChoices = [ u"-- Select --", u"15", u"16", u"17", u"18", u"19", u"20", u"21", u"22", u"23", u"24", u"25", wx.EmptyString ]
        self.Age_options = wx.Choice( self, wx.ID_ANY, wx.DefaultPosition, wx.DefaultSize, Age_optionsChoices, 0 )
        self.Age_options.SetSelection( 0 )
        gSizer2.Add( self.Age_options, 0, wx.ALL, 5 )
        self.Country = wx.StaticText( self, wx.ID_ANY, u"Country:", wx.DefaultPosition, wx.DefaultSize, 0 )
        self.Country.Wrap( -1 )
        self.Country.SetFont( wx.Font( 13, 70, 90, 90, False, wx.EmptyString ) )
        gSizer2.Add( self.Country, 0, wx.ALL, 5 )
        Country_optionsChoices = [ u"-- Select --", u"Mexico", u"Peru", u"India", u"USA", u"UK", u"Greece", u"Agentina", u"Greece", u"Brazil", u"Egypt" ]
        self.Country_options = wx.Choice( self, wx.ID_ANY, wx.DefaultPosition, wx.DefaultSize, Country_optionsChoices, 0 )
        self.Country_options.SetSelection( 0 )
        gSizer2.Add( self.Country_options, 0, wx.ALL, 5 )
        self.Reset_button = wx.Button( self, wx.ID_ANY, u"Reset", wx.DefaultPosition, wx.DefaultSize, 0 )
        gSizer2.Add( self.Reset_button, 0, wx.ALL, 5 )
        self.Exit_button = wx.Button( self, wx.ID_ANY, u"Exit", wx.DefaultPosition, wx.DefaultSize, 0 )
        gSizer2.Add( self.Exit_button, 0, wx.ALL, 5 )

        DataBox.Add( gSizer2, 1, wx.EXPAND|wx.ALIGN_CENTER_VERTICAL, 5 )

        self.SetSizer( DataBox )
        self.Layout()
        self.Centre( wx.BOTH )
        # Connect Events
        self.Reset_button.Bind( wx.EVT_BUTTON, self.OnResetButton )
        self.Exit_button.Bind( wx.EVT_BUTTON, self.OnExitButton )


    def OnResetButton( self, event ):
#       val = '-- Select --'  # NOT WORKING
        val = ' '  # THIS WORKS, BUT RESETS TO EMPTY CHOICE
        self.Color_options.SetLabel(val)
        self.Age_options.SetLabel(val)
        self.Country_options.SetLabel(val)

    def OnExitButton( self, event ):
        self.Close()



app = wx.App(0)
MyFrame1(None).Show()
app.MainLoop()

感谢您的宝贵时间。

Answer 1

请将您的源代码缩减为最小的可运行示例(如下所述)。

答案:我很惊讶wx.Choice.SetLabel(' ')做了一些有用的事情。你要做的是:

    self.Color_Options.SetStringSelection(val)

(参见wxWidgets文档中的wxChoice/wxItemContainer)。

备注: u'--Select--'在Python中不是'--Select--'。事实上，如果源编码设置为UTF-8, wxPython将不会报错，并且可以理解用UTF-8编码的str和u''。

最小可运行示例:一如既往地重要:使您的示例尽可能小，将告诉您哪些部分与您的问题相关，哪些不相关。在很多情况下，通过编写最小的例子，我经常自己找到答案。

最小化你的例子:

import wx
class MyFrame1(wx.Frame):
    def __init__(self, *args, **kwds):
        wx.Frame.__init__(self, *args, **kwds)
        pnl = wx.Panel(self, wx.ID_ANY)
        szmain = wx.BoxSizer(wx.VERTICAL)
        color_choices = [u"-- Select --", u"Red", u"Green", u"Pink", u"Blue", u"Yellow", u"White", u"Brown"]
        self.color_options = wx.Choice(pnl, wx.ID_ANY, choices=color_choices)
        self.color_options.SetSelection(0)
        self.reset_button = wx.Button(pnl, wx.ID_ANY, u"Reset")
        szmain.Add(self.color_options, 0, wx.ALL|wx.EXPAND, 4)
        szmain.Add(self.reset_button, 0, wx.ALL|wx.EXPAND, 4)
        pnl.SetSizer(szmain)
        self.reset_button.Bind( wx.EVT_BUTTON, self.OnResetButton )
    def OnResetButton(self, event):
        val = '-- Select --'  # NOT WORKING
        #  val = ' '  # THIS WORKS, BUT RESETS TO EMPTY CHOICE
        self.color_options.SetLabel(val)
app = wx.App(0)
MyFrame1(None).Show()
app.MainLoop()