Question

我正在使用一部分代码在一个窗口中打开不同的页面，它工作正常。当我尝试从菜单（文件＆gt; New Test）打开一个窗口时，它会打开一个新窗口而不是同一个窗口。我对此感到困惑并且有几个问题。

如何在同一窗口中从菜单中打开窗口。
为什么菜单页面在Page1（NewTestWindow）中可见，如果它在MainPage中定义。
是否为菜单栏创建单独的类是正确的方法，或者最好将其插入到MainWindow类中。

    import tkinter as tk
    from tkinter import font as tkfont

class MenuBar(tk.Menu):
    def __init__(self, parent, controller):
        tk.Menu.__init__(self, controller)
        self.controller = controller

        fileMenu = tk.Menu(self, tearoff=0)
        self.add_cascade(label="File", underline=0, menu=fileMenu)
        fileMenu.add_command(label="New Test", underline=1, command=lambda: SampleApp().show_frame("NewTestWindow"))
        fileMenu.add_separator()
        fileMenu.add_command(label="Exit", underline=2, command=self.onexit)

    def onexit(self):
        quit()        

class SampleApp(tk.Tk):

    def __init__(self, *args, **kwargs):
        tk.Tk.__init__(self, *args, **kwargs)

        self.title_font = tkfont.Font(family='Helvetica', size=18, weight="bold", slant="italic")

        container = tk.Frame(self)
        container.pack(side="top", fill="both", expand=True)
        container.grid_rowconfigure(0, weight=1)
        container.grid_columnconfigure(0, weight=1)

        self.frames = {}
        for F in (MainWindow, NewTestWindow):
            page_name = F.__name__
            frame = F(parent=container, controller=self)
            self.frames[page_name] = frame
            frame.grid(row=0, column=0, sticky="nsew")

        self.show_frame("MainWindow")

    def show_frame(self, page_name):
        '''Show a frame for the given page name'''
        frame = self.frames[page_name]
        frame.tkraise()

class MainWindow(tk.Frame):

    def __init__(self, parent, controller):
        tk.Frame.__init__(self, parent)
        self.controller = controller

        self.menubar = MenuBar(self, parent)
        self.controller.config(menu=self.menubar)

        label = tk.Label(self, text="This is the main page", font=controller.title_font)
        label.pack(side="top", fill="x", pady=10)

        button1 = tk.Button(self, text="Start new test",
                            command=lambda: controller.show_frame("NewTestWindow"))
        button1.pack()

class NewTestWindow(tk.Frame):

    def __init__(self, parent, controller):
        tk.Frame.__init__(self, parent)
        self.controller = controller

        label = tk.Label(self, text="This is page 1", font=controller.title_font)
        label.grid(row=1, column=0)
        button = tk.Button(self, text="Go to the start page",
                           command=lambda: controller.show_frame("MainWindow"))
        button.grid(row=2, column=0)

if __name__ == "__main__":
    app = SampleApp()
    app.mainloop()

Answer 1

更改此内容：

command=lambda: SampleApp().show_frame("NewTestWindow")

对此：

command=lambda: self.show_frame(NewTestWindow)

从菜单打开新框架（已打开窗口中的新窗口）

1 个答案: