Tkinter 更新状态（禁用）：需要重绘/刷新？

Question

我无法根据 OptionMenu 的值获取 (tk.)Label 和 (tk.)Checkbutton 的状态以直观地变为禁用和正常。

下面 OptionMenu 上的命令绑定看起来不错，但我在 updateState() 中使用 configure(state=...) 没有明显效果。我应该强制一些“刷新”或“重绘”（如果是的话，在下面的部分代码中如何？）还是我错过了其他东西？

import Tkinter
from Tkinter import Frame, LabelFrame, Label, Entry, Button, StringVar, OptionMenu, Checkbutton, IntVar, DISABLED, NORMAL

class GeneratorDialog:

  # The UI to configure the settings by the user
  def __init__(self, root, ctrl):
    self.__root = root
    self.__ctrl = ctrl

  def updateState(self, value, label, entry):
    if(value.get()==CONST.FORMAT_PDF): # test works, as the dialog below show in alternance as expected
        tkMessageBox.showinfo('Info', message="enabling checkbox")
        label.configure(state=NORMAL)
        entry.configure(state=NORMAL)
    else:            
        tkMessageBox.showinfo('Info', message="disabling the checkbox")
        label.configure(state=DISABLED)
        entry.configure(state=DISABLED)
    #self.__root.update_idletasks() # how to force "redraw" with grid() manager?


  def show(self):
    self.__root.title(CONST.APP_NAME)
    mainFrame = Frame(self.__root)
    mainFrame.grid(sticky='ew')
    outputFrame = LabelFrame(mainFrame, text='Output Settings')
    outputFrame.grid(column=0, row=1, padx=5, pady=5, sticky='ew')


    keepGeneratedScribusFilesLabel = Label(outputFrame, text='Keep Scribus Files:', width=15, anchor='e')
    keepGeneratedScribusFilesLabel.grid(column=4, row=2, padx=5, pady=5, sticky='e')
    keepGeneratedScribusFilesCheckbox = Checkbutton(outputFrame, variable=self.__ctrl.getKeepGeneratedScribusFilesCheckboxVariable(), anchor='w')
    keepGeneratedScribusFilesCheckbox.grid(column=5, row=2, padx=5, pady=5, sticky='w')

    mergeOutputLabel = Label(outputFrame, text='Merge in Single File:', width=15, anchor='w')
    mergeOutputLabel.grid(column=0, row=2, padx=5, pady=5, sticky='w')
    mergeOutputCheckbox = Checkbutton(outputFrame, variable=self.__ctrl.getMergeOutputCheckboxVariable())
    mergeOutputCheckbox.grid(column=1, row=2, padx=5, pady=5, sticky='w')  

    outputFormatLabel = Label(outputFrame, text='Output Format:', anchor='e')
    outputFormatLabel.grid(column=2, row=2, padx=5, pady=5, sticky='e')
    outputFormatListBox = OptionMenu(outputFrame, self.__ctrl.getSelectedOutputFormat(), *self.__ctrl.getOutputFormatList(),
        command=lambda l=keepGeneratedScribusFilesLabel, c=keepGeneratedScribusFilesCheckbox, v=self.__ctrl.getSelectedOutputFormat(): self.updateState(v, l, c))
    outputFormatListBox.grid(column=3, row=2, padx=5, pady=5, sticky='w')            


    # Buttons to Cancel or to Run the Generator with the given Settings
    helpButton = Button(buttonFrame, text='Help', width=10, command=self.__ctrl.helpButtonHandler)
    helpButton.grid(column=0, row=0, padx=5, pady=5, sticky='e')
    cancelButton = Button(buttonFrame, text='Cancel', width=10, command=self.__ctrl.buttonCancelHandler)
    cancelButton.grid(column=1, row=0, padx=5, pady=5, sticky='e')
    generateButton = Button(buttonFrame, text='Generate', width=10, command=self.__ctrl.buttonOkHandler)
    generateButton.grid(column=2, row=0, padx=5, pady=5, sticky='e')

    # Finally show the Generator Dialog
    mainFrame.grid()
    self.__root.grid()
    self.__root.mainloop()

完整代码在https://github.com/berteh/ScribusGenerator/blob/93a12de4be28054344533ad8fc424e37180668de/ScribusGenerator.py#L278

Answer 1

通过使用类变量 (self.X) 而不是 lambda 局部变量来解决它。

仍然不知道为什么以前的代码（在 lambda 中有局部变量）不会更新 Tk 元素的状态（也许它创建了它的副本？）...但我找到了解决方法。

感谢大家的帮助