Tkinter中嵌入Frame的PanedWindow无法拉伸且不显示窗扇问题求解

• PanedWindow子组件未使用add()方法添加

PanedWindow为专属布局容器，仅支持通过自带的add()方法注册子控件，不能使用grid()/pack()/place()管理子组件。原代码中顶层PanedWindow容器container通过grid()添加两个页面，导致PanedWindow无法识别子组件，无法生成窗扇，自然无法实现拖拽拉伸效果。

• PanedWindow自身布局未配置拉伸属性

顶层container调用grid()方法时未添加sticky="nsew"参数，导致PanedWindow本身无法跟随主窗口缩放。

• 容器类Frame未配置行列权重

MainPage、PlottingPage等作为容器的Frame实例，未给自身的行、列设置weight参数，导致内部嵌套的PanedWindow和控件无法跟随父容器拉伸。

• 子组件重复布局冲突

代码中多处先对Frame调用grid()，后又将其添加到PanedWindow的操作，add()方法会自动接管子组件的布局控制，重复的布局声明会导致逻辑冲突，窗扇样式、拉伸逻辑均会失效。

import tkinter as tk
from tkinter import ttk
class Main(tk.Tk):
    def __init__(self, *args, **kwargs):
        tk.Tk.__init__(self, *args, **kwargs)
        tk.Tk.wm_title(self, "Program")

        self.columnconfigure(0, weight=1)
        self.rowconfigure(0, weight=1)

        container = tk.PanedWindow(self, bg='bisque',orient=tk.HORIZONTAL, relief='groove', borderwidth=2, sashwidth=3)
        # 增加sticky让PanedWindow跟随主窗口拉伸
        container.grid(row=0, column=0, sticky="nsew")

        self.frames = {}        

        main_page = MainPage(container, self)
        self.frames[0] = main_page
        # 用add方法添加子组件，不要用grid
        container.add(main_page, stretch="always")

        plotting_page = PlottingPage(container, self)
        self.frames[1] = plotting_page
        container.add(plotting_page, stretch="always")
    
class MainPage(tk.Frame):
    def __init__(self, parent, controller):
        tk.Frame.__init__(self, parent)
        # 配置当前Frame的行列权重，让内部组件可以拉伸
        self.columnconfigure(0, weight=1)
        self.rowconfigure(1, weight=3)
        self.rowconfigure(2, weight=1)

        # Paned Windows
        top_pane = tk.PanedWindow(self, orient=tk.HORIZONTAL, relief='groove', borderwidth=2, sashwidth=3)
        top_pane.grid(column=0, row=1, sticky="nsew")

        bottom_pane = tk.PanedWindow(self, orient=tk.VERTICAL, relief='groove', borderwidth=2, sashwidth=50)
        bottom_pane.grid(column=0, row=2, sticky="nsew")

        # Frames      
        top_frame = ttk.LabelFrame(self, text="Top frame")
        bottom_frame = ttk.LabelFrame(self, text="Bottom frame")

        # 去掉Frame的grid调用，由PanedWindow接管布局
        top_frame.columnconfigure(0, weight=1)
        top_frame.rowconfigure(0, weight=1)
        top_pane.add(top_frame, stretch="always")

        bottom_frame.columnconfigure(0, weight=1)
        bottom_frame.rowconfigure(0, weight=1)
        bottom_pane.add(bottom_frame, stretch="always")

        top = tk.Label(top_frame, text="top pane")
        top.grid(column=0, row=0, sticky="nsew")

        bottom = tk.Label(bottom_frame, text="bottom pane")
        bottom.grid(column=0, row=0, sticky="nsew")        

class PlottingPage(tk.Frame):
    def __init__(self, parent, controller):
        tk.Frame.__init__(self, parent)
        # 配置当前Frame的行列权重
        self.columnconfigure(0, weight=1)
        self.rowconfigure(0, weight=1)

        # Paned Windows
        right_pane = tk.PanedWindow(self, orient=tk.HORIZONTAL, relief='groove', borderwidth=2, sashwidth=3)
        right_pane.grid(column=0, row=0, sticky="nsew")

        # Frames      
        right_frame = ttk.LabelFrame(self, text="Right frame")

        right_frame.columnconfigure(0, weight=1)
        right_frame.rowconfigure(0, weight=1)
        right_pane.add(right_frame, stretch="always")

        # Widgets
        right = tk.Label(right_frame, text="right pane")
        right.grid(column=0, row=0, sticky="nsew")

def main():
    app = Main()
    app.geometry("800x600")
    app.mainloop()

if __name__ == '__main__':
    main()

内容的提问来源于stack exchange，提问作者user10575420