Question

我正在尝试将NEW_FRAME的函数移动到根窗口的Frame前面，以便旧框架和其中的其他窗口小部件将落后于函数NEW_FRAME只显示其小部件。所以我搜索并发现tkinter有lift方法来实现，但我无法正确实现它，尝试将其放置在函数内的不同位置。

此链接：explanation of the lift method with an example

from tkinter import *


root = Tk()
root.geometry("1300x600")

welcome = Frame(root, bg="yellow")
welcome.pack( fill=BOTH, expand=True)

label = Label(welcome, text="welcome bro to page one")
label.grid(row=45, column=50)

b = Label(welcome, text="you can select menu bar to switch page")
b.grid(row=100, column=500)


def NEWS_Frame():
    new = Frame(root, bg="red")
    new.pack(fill=BOTH, expand=True)
    l1 = Label(new, text="Have been waiting for")
    l1.grid(row=49, column=80)

    l2 = Label(new, text="hello dude how be things")
    l2.grid(row=0, column=0)

    new.lift()  # have position it to lift the new frame to the top of Frame

# menu bar start here

MAIN_MENU = Menu(root)
root.config(menu=MAIN_MENU)


File_menu = Menu(MAIN_MENU)
MAIN_MENU.add_cascade(label="NEW PAGE", menu=File_menu, underline=0)
File_menu.add_command(label="NEWS", command=NEWS_Frame)



root.mainloop()

Answer 1

lift在Z轴上移动小部件，pack在X轴和Y轴上排列小部件。 lift无法更改使用pack

排列的窗口小部件的顺序

Answer 2

首先，您的Minimal, Complete, and Verifiable example应该仅包含最少的数量的代码，以重现特定问题。下面的代码完全重现了您遇到问题的行为，但没有更多：

import tkinter as tk


def swap():
    button2.pack()
    button2.lift()


if __name__ == '__main__':
    root = tk.Tk()
    button1 = tk.Button(root, text="Swap with button 2", command=swap)
    button2 = tk.Button(root, text="Swap with button 1")
    button1.pack()
    root.mainloop()

使用pack的解决方法：

您无法使用pack将小部件放在另一个小部件上。 pack实际上是用于在2-d中堆叠，因为它用于水平或垂直堆叠，但不用于深度维度中的堆积小部件。但是，错误的解决方法是在显示另一个时隐藏窗口小部件，根本不需要lift。

在下面的代码中，每次调用swap时，它会隐藏一个按钮，同时显示另一个按钮：

try:                        # In order to be able to import tkinter for
    import tkinter as tk    # either in python 2 or in python 3
except:
    import Tkinter as tk


def swap():
    global is_button1_lifted
    if is_button1_lifted:
        button1.pack_forget()
        button2.pack()
    else:
        button2.pack_forget()
        button1.pack()
    is_button1_lifted = not is_button1_lifted


if __name__ == '__main__':
    root = tk.Tk()
    is_button1_lifted = True
    button1 = tk.Button(root, text="Swap with button 2", command=swap)
    button2 = tk.Button(root, text="Swap with button 1", command=swap)
    swap()
    root.mainloop()

使用grid回答：

此是在OP的情况下使用lift的方式。这种方式的工作方式是两个小部件都显示在网格的相同的节点中。小部件lift方法仅用于 over 其他方法。

在下面的示例中，显示了两个按钮，而其中一个按钮（在这种情况下为button2）仅通过位于另一个按钮之前阻止另一个按钮。当lift被调用时，它只是让它的对象出现在前面：

try:                        # In order to be able to import tkinter for
    import tkinter as tk    # either in python 2 or in python 3
except:
    import Tkinter as tk


def swap():
    global is_button1_lifted
    if is_button1_lifted:
        button2.lift()
    else:
        button1.lift()
    is_button1_lifted = not is_button1_lifted


if __name__ == '__main__':
    root = tk.Tk()
    is_button1_lifted = False
    button1 = tk.Button(root, text="Swap with button 2", command=swap)
    button2 = tk.Button(root, text="Swap with button 1", command=swap)
    button1.grid(row=0, column=0)
    button2.grid(row=0, column=0)
    root.mainloop()

使用place回答：

这与grid的答案几乎相同，place只有更直接的布局控制：

try:                        # In order to be able to import tkinter for
    import tkinter as tk    # either in python 2 or in python 3
except:
    import Tkinter as tk


def swap():
    global is_button1_lifted
    if is_button1_lifted:
        button2.lift()
    else:
        button1.lift()
    is_button1_lifted = not is_button1_lifted


if __name__ == '__main__':
    root = tk.Tk()
    is_button1_lifted = False
    button1 = tk.Button(root, text="Swap with button 2", command=swap)
    button2 = tk.Button(root, text="Swap with button 1", command=swap)
    button1.place(x=23, y=87)
    button2.place(x=23, y=87)
    root.mainloop()

如何实施提升方法？

2 个答案: