Tkinter画布未填充根窗口

Question

下面的代码创建了一个画布，里面有一个框架。我使用这个画布是为了添加一个垂直的滚动条，滚动条会根据需要出现。我给不同的部分上了颜色 - 根部分是蓝色；窗口是绿色；画布是红色；框架是青色。从这些颜色可以看出，窗口完全填满了根部分（看不到蓝色）。但是，画布只在垂直方向上填满了窗口（在窗口扩展时，右边可以看到绿色），而框架只在水平方向上填满了画布（在青色下面可以看到红色）。我看不出是什么导致了这个问题。框架是绑定在画布上的，而画布设置了sticky='nsew'，所以应该填满窗口。

import Tkinter as tk
import tkFileDialog

class AutoScrollbar(tk.Scrollbar):
    # a scrollbar that hides itself if it's not needed.  only
    # works if you use the grid geometry manager.
    def set(self, lo, hi):
        if float(lo) <= 0.0 and float(hi) >= 1.0:
            # grid_remove is currently missing from Tkinter!
            self.tk.call("grid", "remove", self)
        else:
            self.grid()
        tk.Scrollbar.set(self, lo, hi)
    def pack(self, **kw):
        raise TclError, "cannot use pack with this widget"
    def place(self, **kw):
        raise TclError, "cannot use place with this widget"

class Window(tk.Frame):
  def UserInput(self,status,name):
    row = self.row
    optionLabel = tk.Label(self.frame)
    optionLabel["text"] = name
    optionLabel.grid(row=row, column=0, sticky='w')
    var = tk.StringVar(root)
    var.set(status)
    w = tk.Entry(self.frame, textvariable= var)
    w.grid(row=row, column=1, sticky='ew')
    self.grid_columnconfigure(1,weight=1)
    self.row += 1
    return w

  def on_canvas_resize(self,event):
    padding = 8
    width = self.canvas.winfo_width() - padding
    self.canvas.itemconfigure("frame", width=width)

  def OnFrameConfigure(self, event):
    self.canvas.configure(scrollregion=self.canvas.bbox("all"))

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

    self.grid_rowconfigure(0, weight=1)
    self.grid_columnconfigure(0,weight=1)

    self.vscrollbar = AutoScrollbar(self,orient = tk.VERTICAL)
    self.vscrollbar.grid(row = 0,column = 3, sticky = 'ns')

    self.canvas = tk.Canvas(self, yscrollcommand = self.vscrollbar.set,bg='red')
    self.canvas.grid(row=0, column=0, sticky='nsew')
    self.canvas.grid_rowconfigure(0, weight = 1)
    self.canvas.grid_columnconfigure(0, weight = 1)

    self.frame = tk.Frame(self.canvas, bg='cyan')
    self.frame.bind("<Configure>", self.OnFrameConfigure)

    self.frame.grid_rowconfigure(0, weight=1)
    self.frame.grid_columnconfigure(0,weight=1)
    self.frame.grid_columnconfigure(1,weight=3)

    self.vscrollbar.config(command=self.canvas.yview) 

    self.canvas.create_window(0, 0, anchor = tk.NW, window= self.frame, tags =["frame"])
    self.canvas.bind("<Configure>", self.on_canvas_resize)

    self.row = 0

    for i in range(10):
      self.Number = self.UserInput("1", "number")

if __name__ == "__main__":
  root = tk.Tk()
  root.configure(background='blue')  
  root.grid_columnconfigure(0, weight=1)
  root.grid_rowconfigure(0,weight=1)  
  window = Window(root)
  window.configure(background='green')
  window.grid(row=0,column=0,sticky='nsew')
  root.mainloop()

tkinter 界面设计画布滚动条颜色管理窗口布局 sticky

Tkinter画布未填充根窗口

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