画布中的框架不会扩展以适合画布

Question

我不确定为什么这不起作用。我一定是遗漏了一些东西，因为我可以使单个框架展开以适合画布，但我无法使框架内的框架展开以适合画布。

我已经为此奋斗了好几个小时，我觉得它很明显。

我希望 NoteFrame 内的标签扩展以填充框架，而 NoteFrame 扩展以填充画布。

这是重现行为代码的最少代码：

import tkinter as tk


class NoteFrame(tk.Frame):
    def __init__(self, container):
        super().__init__(container)
        self.config(background='white')
        for i in range(20):
            tk.Label(self, text='test').grid(row=i, column=0, sticky='nsew')


class GCMain(tk.Tk):
    def __init__(self):
        super().__init__()
        self.columnconfigure(0, weight=1)
        self.rowconfigure(0, weight=1)

        self.main_canvas = tk.Canvas(self, background="bisque")
        self.main_canvas.columnconfigure(0, weight=1)
        self.main_canvas.rowconfigure(0, weight=1)
        self.frame_n_canvas = tk.Frame(self.main_canvas)
        self.frame_n_canvas.grid(row=0, column=0, sticky='nsew') # tried with and without this
        self.frame_n_canvas.columnconfigure(0, weight=1)
        self.main_canvas.config(scrollregion=self.main_canvas.bbox("all"), highlightthickness=0)
        scrollbar = tk.Scrollbar(self, orient='vertical')
        scrollbar.grid(row=0, column=1, sticky='nsw')
        scrollbar.config(command=self.main_canvas.yview)
        self.main_canvas.config(yscrollcommand=scrollbar.set)
        self.main_canvas.grid(row=0, column=0, sticky='nsew')
        self.main_canvas.create_window(0, 0, window=self.frame_n_canvas, anchor='nw')
        self.main_canvas.bind("<Configure>", self.update_scrollregion)

        nf = NoteFrame(self.frame_n_canvas)
        nf.grid(row=0, column=0, sticky='nsew') # tried with and without this

    def on_resize(self, event):
        w, h = event.width, event.height
        self.main_canvas.configure(width=w, height=h)
        self.frame_n_canvas(width=w, height=h) # tried with and without this

    def update_scrollregion(self, event):
        self.main_canvas.configure(scrollregion=self.main_canvas.bbox("all"))


if __name__ == '__main__':
    GCMain().mainloop()

Answer 1

评论：动态解决方案

1. 允许您的Label 成为sticky='ew' 使用.grid_columnconfigure(0, weight=1)。

   class NoteFrame(tk.Frame):
       def __init__(self, container):
           super().__init__(container)
           self.grid_columnconfigure(0, weight=1)
   

2. 您需要Canvas(..., window= 对象的iid 项。
   否 需要参数width=200, height=200！

   self.main_canvas.fram_n_canvas_iid =\
           self.main_canvas.create_window(0, 0, window=self.frame_n_canvas, anchor='nw')
   

3. 如已知的那样绑定到"<Configure>。

   self.main_canvas.bind("<Configure>", self.canvas_configure)
   

4. 调整 .frame_n_canvas width 与 .main_canvas width 同步。

   def canvas_configure(self, event):
       canvas = event.widget
       canvas.itemconfigure(canvas.fram_n_canvas_iid, width=canvas.winfo_width())
   

---

问题：画布中的框架无法展开以适合画布

如果在 Canvas 中与 .create_window(... 一起放置，小部件（此处为您的 Frame self.frame_n_canvas）将失去expand 的功能。

这个，.grid(...，没用，因为您稍后将相同的Frame 与.create_window(... 放在一起：

self.frame_n_canvas.grid(row=0, column=0, sticky='nsew') # tried with and without this
...
self.main_canvas.create_window(0, 0, window=self.frame_n_canvas, anchor='nw')

要为您的NoteFrame 提供扩展空间，请使用参数width=200, height=200。

self.main_canvas.create_window(0, 0, window=self.frame_n_canvas, anchor='nw',
                               width=200, height=200)

要让您的Label 成为sticky='ew'，您必须执行.grid_columnconfigure(...：

class NoteFrame(tk.Frame):
    def __init__(self, container):
        super().__init__(container)
        self.grid_columnconfigure(0, weight=1)

结果：