wxPython中wx.TextCtrl的值设置问题

Question

我试图将用户选择的目录传递回名为 ChooseRoot 的 wx.TextCtrl。到目前为止这还没有奏效。

我做错了什么？我尝试了不同的方法，但要么挂起，要么收到此错误消息。

回溯（最近一次调用最后一次）：
文件“F:\Indexinator3000_x64.pyw”，第 78 行，位于 OnChooseRoot
self.ChooseRoot.SetValue("Hello")
AttributeError：“MainPanel”对象没有属性“ChooseRoot”

import wx 

ID_EXIT = 110

class MainPanel(wx.Panel):
    def __init__(self, parent, id):
        wx.Panel.__init__(self, parent, id)
        self.parent = parent

        #------------- Setting up the buttons
        self.Run = wx.Button(self, label="Run")
        self.Run.Bind(wx.EVT_BUTTON, self.OnRun )
        self.ExitB = wx.Button(self, label="Exit")
        self.ExitB.Bind(wx.EVT_BUTTON, self.OnExit)

        #------------- Setting up Static text
        self.labelChooseRoot = wx.StaticText(self, label ="Root catalog: ") 
        self.labelScratchWrk = wx.StaticText(self, label ="Sratch workspace: ")
        self.labelMergeFile = wx.StaticText(self, label ="Merge file: ")

        #------------ Setting up inputtext
        self.ChooseRoot = wx.TextCtrl(self, -1, size=(210,-1))
        self.ChooseRoot.Bind(wx.EVT_LEFT_UP, self.OnChooseRoot)
        self.ScratchWrk = wx.TextCtrl(self, -1, size=(210,-1))
        self.MergeFile = wx.TextCtrl(self, -1, size=(210,-1))


        #------------- Setting up the outputbox
        self.Output = wx.TextCtrl(self, style=wx.TE_MULTILINE|wx.TE_READONLY)

        #------------- Setting up the sizer
        SizerF = wx.FlexGridSizer(3,2,5,5)
        SizerF.Add(labelChooseRoot)      #row 1, col 1
        SizerF.Add(ChooseRoot)           #row 1, col 2
        SizerF.Add(labelScratchWrk)      #row 2, col 1
        SizerF.Add(ScratchWrk)           #row 2, col 2
        SizerF.Add(labelMergeFile)       #row 3, col 1
        SizerF.Add(MergeFile)            #row 3, col 2

        SizerB = wx.BoxSizer(wx.VERTICAL)
        SizerB.Add(Run, 1, wx.ALIGN_RIGHT|wx.ALL, 5)
        SizerB.Add(ExitB, 0, wx.ALIGN_RIGHT|wx.ALL, 5)

        Sizer1 = wx.BoxSizer()
        Sizer1.Add(SizerF, 0, wx.ALIGN_RIGHT | wx.EXPAND | wx.ALL, 10)
        Sizer1.Add(SizerB, 0, wx.ALIGN_RIGHT | wx.EXPAND | wx.ALL)

        Sizer2 = wx.BoxSizer()
        Sizer2.Add(Output, 1, wx.EXPAND | wx.ALL, 5)

        SizerFinal = wx.BoxSizer(wx.VERTICAL)
        SizerFinal.Add(Sizer1, 0, wx.ALIGN_RIGHT | wx.EXPAND | wx.ALL)
        SizerFinal.Add(Sizer2, 1, wx.ALIGN_RIGHT | wx.EXPAND | wx.ALL)


        self.SetSizerAndFit(SizerFinal)

    #--- START EVENT HANDLERS

    def OnChooseRoot(self, Event=None):
        # In this case we include a "New directory" button. 
        dlg = wx.DirDialog(self, "Choose a directory:",
                          style=wx.DD_DEFAULT_STYLE
                           #| wx.DD_DIR_MUST_EXIST
                           #| wx.DD_CHANGE_DIR
                           )

        # If the user selects OK, then we process the dialog's data.
        # This is done by getting the path data from the dialog - BEFORE
        # we destroy it. 
        if dlg.ShowModal() == wx.ID_OK:
            RootPath = dlg.GetPath()
            self.ChooseRoot.SetValue(RootPath)

        # Only destroy a dialog after you're done with it.
        dlg.Destroy()

    def OnRun(self, Event=None):
        #First check if any of the boxes is empty
        pass

    def OnExit(self, Event=None):
        self.GetParent().Close()


    #--- END EVENT HANDLERS

class MainWindow(wx.Frame):
    def __init__(self, parent, id, title):
        wx.Frame.__init__(self, parent, wx.ID_ANY, title, size = (430,330),
                          style = wx.DEFAULT_FRAME_STYLE | wx.NO_FULL_REPAINT_ON_RESIZE | wx.STAY_ON_TOP)
        self.CreateStatusBar() 
        #------------- Setting up the menu
        filemenu = wx.Menu()
        filemenu.Append(ID_EXIT, "E&xit", "Exit the program")
        #------------- Creating the menu
        menubar = wx.MenuBar()
        menubar.Append(filemenu, "&File")
        self.SetMenuBar(menubar)
        #---------- Setting menu event handlers
        wx.EVT_MENU(self, ID_EXIT, self.OnExit)                    
        #--- Add MainPanel
        self.Panel = MainPanel(self, -1)

        self.SetMaxSize(self.GetSize()) #Sets the Maximum size the window can have
        self.SetMinSize(self.GetSize()) #Sets the Minimum size the window can have
        #Centre on Screen
        self.CentreOnScreen()

        ###---- SHOW THE WINDOW
        self.Show(True)

    def OnExit(self,  event):
        self.Close(True) # Close the Frame
    #--- END EVENT HANDLERS ---------------------------------



if __name__=='__main__':

    try:
        app = wx.PySimpleApp()
        frame = MainWindow(None, -1, "IndexGenerator")
        app.MainLoop()
    finally:
        del app

Answer 1

仔细阅读我在上一个问题中给您的建议。特别是：

• 使用小部件的对象属性，这样您就不会失去对它们的跟踪 (self.ChooseRoot =...)
• 使用更具描述性的小部件名称 (self.labelChooseRoot)

在 __init__ 方法（​​也称为构造函数）之外，您会失去对小部件的跟踪。您必须将它们作为属性添加到您的 MainPanel 对象中。

class MainPanel(wx.Panel):
    def __init__(self, parent, id):
        ...
        self.ChooseRoot = wx.TextCtrl(self, size=(210, -1))
        ...

    def OnChooseRoot(self, event=None):
        ...
        self.ChooseRoot.SetValue(RootPath)
        ...

我还推荐阅读一些有关 OOP 概念的文章。也许您可以从此处开始。

编辑：
你几乎已经成功了。这个想法很好，你只是忘记了一些地方。我已经更新了您的代码以符合我的“标准”，删除了一些不必要的复制/粘贴内容以及其他一些细微的调整。如果您愿意，可以使用一些比较软件并仔细比较以查看更改。

import wx 

ID_EXIT = 110

class MainPanel(wx.Panel):
    def __init__(self, parent):
        wx.Panel.__init__(self, parent)

        self.buttonRun = wx.Button(self, label="Run")
        self.buttonRun.Bind(wx.EVT_BUTTON, self.OnRun )
        self.buttonExit = wx.Button(self, label="Exit")
        self.buttonExit.Bind(wx.EVT_BUTTON, self.OnExit)

        self.labelChooseRoot = wx.StaticText(self, label ="Root catalog: ") 
        self.labelScratchWrk = wx.StaticText(self, label ="Scratch workspace: ")
        self.labelMergeFile = wx.StaticText(self, label ="Merge file: ")

        self.textChooseRoot = wx.TextCtrl(self, size=(210, -1))
        self.textChooseRoot.Bind(wx.EVT_LEFT_UP, self.OnChooseRoot)
        self.textScratchWrk = wx.TextCtrl(self, size=(210, -1))
        self.textMergeFile = wx.TextCtrl(self, size=(210, -1))
        self.textOutput = wx.TextCtrl(self, style=wx.TE_MULTILINE | wx.TE_READONLY)

        self.sizerF = wx.FlexGridSizer(3, 2, 5, 5)
        self.sizerF.Add(self.labelChooseRoot)  #row 1, col 1
        self.sizerF.Add(self.textChooseRoot)   #row 1, col 2
        self.sizerF.Add(self.labelScratchWrk)  #row 2, col 1
        self.sizerF.Add(self.textScratchWrk)   #row 2, col 2
        self.sizerF.Add(self.labelMergeFile)   #row 3, col 1
        self.sizerF.Add(self.textMergeFile)    #row 3, col 2

        self.sizerB = wx.BoxSizer(wx.VERTICAL)
        self.sizerB.Add(self.buttonRun, 1, wx.ALIGN_RIGHT|wx.ALL, 5)
        self.sizerB.Add(self.buttonExit, 0, wx.ALIGN_RIGHT|wx.ALL, 5)

        self.sizer1 = wx.BoxSizer()
        self.sizer1.Add(self.sizerF, 0, wx.ALIGN_RIGHT | wx.EXPAND | wx.ALL, 10)
        self.sizer1.Add(self.sizerB, 0, wx.ALIGN_RIGHT | wx.EXPAND | wx.ALL)

        self.sizer2 = wx.BoxSizer()
        self.sizer2.Add(self.textOutput, 1, wx.EXPAND | wx.ALL, 5)

        self.sizerFinal = wx.BoxSizer(wx.VERTICAL)
        self.sizerFinal.Add(self.sizer1, 0, wx.ALIGN_RIGHT | wx.EXPAND | wx.ALL)
        self.sizerFinal.Add(self.sizer2, 1, wx.ALIGN_RIGHT | wx.EXPAND | wx.ALL)

        self.SetSizerAndFit(self.sizerFinal)


    def OnChooseRoot(self, event):
        dlg = wx.DirDialog(self, "Choose a directory:", style=wx.DD_DEFAULT_STYLE)
        if dlg.ShowModal() == wx.ID_OK:
            root_path = dlg.GetPath()
            self.textChooseRoot.SetValue(root_path)
        dlg.Destroy()

    def OnRun(self, event):
        #First check if any of the boxes is empty
        pass

    def OnExit(self, event):
        self.GetParent().Close()


class MainWindow(wx.Frame):
    def __init__(self):
        wx.Frame.__init__(self, None, title="IndexGenerator", size=(430, 330), 
                          style=((wx.DEFAULT_FRAME_STYLE | wx.NO_FULL_REPAINT_ON_RESIZE | 
                                  wx.STAY_ON_TOP) ^ wx.RESIZE_BORDER))
        self.CreateStatusBar() 

        self.fileMenu = wx.Menu()
        self.fileMenu.Append(ID_EXIT, "E&xit", "Exit the program")
        self.menuBar = wx.MenuBar()
        self.menuBar.Append(self.fileMenu, "&File")
        self.SetMenuBar(self.menuBar)
        wx.EVT_MENU(self, ID_EXIT, self.OnExit)                    

        self.Panel = MainPanel(self)

        self.CentreOnScreen()
        self.Show()

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

if __name__ == "__main__":
    app = wx.App(False)
    frame = MainWindow()
    app.MainLoop()