from tkinter import *
window = Tk()
ia_answers= "test\n"
input_frame = LabelFrame(window, text="User :", borderwidth=4)
input_frame.pack(fill=BOTH, side=BOTTOM)
input_user = StringVar()
input_field = Entry(input_frame, text=input_user)
input_field.pack(fill=BOTH, side=BOTTOM)
def onFrameConfigure(canvas):
'''Reset the scroll region to encompass the inner frame'''
canvas.configure(scrollregion=canvas.bbox("all"))
canvas = Canvas(window, borderwidth=0, background="white")
ia_frame = LabelFrame(canvas, text="Discussion",borderwidth = 15, height = 100, width = 100)
ia_frame.pack(fill=BOTH, side=TOP)
scroll = Scrollbar(window, orient="vertical", command=canvas.yview)
canvas.configure(yscrollcommand=scroll.set)
scroll.pack(side=RIGHT, fill=Y)
canvas.pack(fill=BOTH, expand=True)
canvas.create_window((4,4), window=ia_frame, anchor="nw")
ia_frame.bind("<Configure>", lambda event, canvas=canvas:onFrameConfigure(canvas))
user_says = StringVar()
user_text = Label(ia_frame, textvariable=user_says, anchor = NE, justify = RIGHT, bg="white")
user_text.pack(fill=X)
ia_says = StringVar()
ia_text = Label(ia_frame, textvariable=ia_says, anchor = NW, justify = LEFT, bg="white")
ia_text.pack(fill=X)
user_texts = []
ia_texts = []
user_says_list = []
ia_says_list = []
def Enter_pressed(event):
"""Took the current string in the Entry field."""
input_get = input_field.get()
input_user.set("")
user_says1 = StringVar()
user_says1.set(input_get + "\n")
user_text1 = Label(ia_frame, textvariable=user_says1, anchor = NE, justify = RIGHT, bg="white")
user_text1.pack(fill=X)
user_texts.append(user_text1)
user_says_list.append(user_says1)
ia_says1 = StringVar()
ia_says1.set(ia_answers)
ia_text1 = Label(ia_frame, textvariable=ia_says1, anchor = NW, justify = LEFT, bg="white")
ia_text1.pack(fill=X)
ia_texts.append(ia_text1)
ia_says_list.append(ia_says1)
input_field.bind("<Return>", Enter_pressed)
window.mainloop()
嗨，我尝试用tkinter构建一个GUI，但是有两个问题，LabelFrame / Canvas不能完全填满窗口，并且我无法使滚动条自动向下滚动。您能帮我吗，非常感谢。伊兰·罗斯勒（Ilan Rossler）。
由于内部框架是由画布管理的，因此您需要手动控制内部框架的宽度。您可以更改绑定到<Configure>画布事件的宽度（即：当画布更改大小时，必须更改框架的大小）。
您将需要能够在画布上引用窗口对象，这意味着您需要保存ID或为其添加标签。
这是为其提供标签的示例：
canvas.create_window((4,4), window=ia_frame, anchor="nw", tags=("innerFrame",))
以下是当画布更改大小时如何更改宽度的方法：
def onCanvasConfigure(event):
canvas = event.widget
canvas.itemconfigure("innerFrame", width=canvas.winfo_width() - 8)
canvas.bind("<Configure>", onCanvasConfigure)
要向下滚动，请yview像滚动条一样调用命令。您需要在窗口有机会刷新后进行此操作。
例如，将其添加为以下内容的最后一行Enter_pressed：
def Enter_pressed(event):
...
canvas.after_idle(canvas.yview_moveto, 1.0)
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