Question

我是python2.7和Tkinter的新GUI项目。我正在尝试创建一个新的框架，具体取决于用户选择的Radiobutton，如菜单。当我点击一个radiobutton它创建一个新的框架就像我想要的，但如果我继续点击相同的radiobutton，它将创建另一个框架，另一个框架，等等似乎无法弄清楚如何检查如果Radiobutton已被标记（仅点击一次）。

希望我清楚明白，感谢你的帮助！

class Books:
    """ Books() is the main class for creating the whole interface """
    def __init__(self):
    """ Initialize the first function in class Books() """

        self.library = "library.txt"
        self.filepath = os.getcwd() + "/" + self.library

        self.window = Tk()

        self.window.title("Personal library")
        self.window.wm_iconbitmap(default="myicon.ico")

        userChoice = Frame(self.window, height = 1, bd = 1, relief = RIDGE)
        userChoice.pack(side = TOP, pady = 10, padx = 5)

        self.menuChoice = IntVar()

        btAddBooks = Radiobutton(userChoice, text = "Add a new book to the library", value = 1, variable = self.menuChoice, command = self.processChoice)
        btAddBooks.grid(row = 1, sticky = W)

        btFindBooks = Radiobutton(userChoice, text = "Print info about a book", value = 2, variable = self.menuChoice, command = self.processChoice)
        btFindBooks.grid(row = 2, sticky = W)

        btPrintBooks = Radiobutton(userChoice, text = "Print all book titles in library", value = 3, variable = self.menuChoice, command = self.processChoice)
        btPrintBooks.grid(row = 3, sticky = W


    def processChoice(self):
        """ Used to handle user choice of Radiobuttons """
        if self.menuChoice.get() == 1:
            self.processAddBooks()
        elif self.menuChoice.get() == 2:
            self.processFindBook()
        elif self.menuChoice.get() == 3:
            self.processShowBooks(self.filepath)


    def processAddBooks(self):
        """ Add a new book to the library. """
        # Create a new frame
        questions = Frame(self.window, height = 1, bd = 1, relief = SUNKEN)
        questions.pack(fill = X, pady = 10, padx = 5)

        # Do stuff with frame here...

Answer 1

好吧，如果您一次只需要打开一个帧，则可以在实例化新帧之前在前一帧上调用frame.destroy()。但是，这种方法需要在第一次选择其中一个按钮时为Tkinter初始化destroy，否则您将收到错误。为了我的目的，我刚刚用一个destroy方法创建了一个一次性类，然后使用该类的实例作为绑定到该变量的占位符，直到第一次创建Toplevel小部件。如果您希望同时打开多个框架，只是不要重复相同的选项，请尝试为每个框架使用不同的变量名称，并仅创建框架if not frame.winfo_exists() - 尽管我并非100％确定在第一次创建帧之前，这不会容易受到分配给该变量的占位符的相同问题的影响。如果需要，占位符类需要winfo_exists() return False方法。

Tkinter Radiobutton产生框架

1 个答案: