一种解决方案是使用具有自定义样式的ttk框架，该样式使用角落的图像。

以下示例改编自我在2007年写回的tcl / tk解决方案。它使用奇怪的颜色作为焦点，并且需要白色背景，但您可以创建自己的图像来替换此解决方案中使用的图像(或编辑本例中的图像1 )

# adapted from http://wiki.tcl.tk/%0920152

import tkinter as tk

from tkinter import ttk

focusBorderImageData = '''

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zKyurOzu7JyenNze3Ly+vPz+/OkAKOUA5IEAEnwAAACuQACUAAFBAAB+AFYd

QAC0AABBAAB+AIjMAuEEABINAAAAAHMgAQAAAAAAAAAAAKjSxOIEJBIIpQAA

sRgBMO4AAJAAAHwCAHAAAAUAAJEAAHwAAP+eEP8CZ/8Aif8AAG0BDAUAAJEA

AHwAAIXYAOfxAIESAHwAAABAMQAbMBZGMAAAIEggJQMAIAAAAAAAfqgaXESI

5BdBEgB+AGgALGEAABYAAAAAAACsNwAEAAAMLwAAAH61MQBIAABCM8B+AAAU

AAAAAAAApQAAsf8Brv8AlP8AQf8Afv8AzP8A1P8AQf8AfgAArAAABAAADAAA

AACQDADjAAASAAAAAACAAADVABZBAAB+ALjMwOIEhxINUAAAANIgAOYAAIEA

AHwAAGjSAGEEABYIAAAAAEoBB+MAAIEAAHwCACABAJsAAFAAAAAAAGjJAGGL

AAFBFgB+AGmIAAAQAABHAAB+APQoAOE/ABIAAAAAAADQAADjAAASAAAAAPiF

APcrABKDAAB8ABgAGO4AAJAAqXwAAHAAAAUAAJEAAHwAAP8AAP8AAP8AAP8A

AG0pIwW3AJGSAHx8AEocI/QAAICpAHwAAAA0SABk6xaDEgB8AAD//wD//wD/

/wD//2gAAGEAABYAAAAAAAC0/AHj5AASEgAAAAA01gBkWACDTAB8AFf43PT3

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q4sA5UGpEn4AAIg02xBk/0eD/358fx/4iADk5QASEgAAAALnHABkAACDqQB8

AMyINARkZA2DgwB8fBABHL0AAEUAqQAAAIAxKOMAPxIwAAAAAIScAOPxABIS

AAAAAIIAnQwA/0IAR3cAACwAAAAAQABAAAAI/wA/CBxIsKDBgwgTKlzIsKFD

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hfrsuVfefgzJR599A+CnH4Hb9fcfgu29x6BIBgKYYH4DTojQc/5ZGGGGGhpU

IYIKghgiQRw+GKCEJxZIwXwWlthiQyl6KOCMLsJIIoY4LlQjhDf2mNCI9/Eo

5IYO2sjikX+9eGCRCzL5V5JALillY07GaOSVb1G5ookzEnlhlFx+8OOXZb6V

5Y5kcnlmckGmKaaMaZrpJZxWXjnnlmW++WGdZq5ZXQEetKmnlxPgl6eUYhJq

KKOI0imnoNbF2ScFHQJJwW99TsBAAAVYWEAAHEQAZoi1cQDqAAeEV0EACpT/

JqcACgRQAW6uNWCbYKcyyEwGDBgQwa2tTlBBAhYIQMFejC5AgQAWJNDABK3y

loEDEjCgV6/aOcYBAwp4kIF6rVkXgAEc8IQZVifCBRQHGqya23HGIpsTBgSU

OsFX/PbrVVjpYsCABA4kQCxHu11ogAQUIOAwATpBLDFQFE9sccUYS0wAxD5h

4DACFEggbAHk3jVBA/gtTIHHEADg8sswxyzzzDQDAAEECGAQsgHiTisZResN

gLIHBijwLQEYePzx0kw37fTSSjuMr7ZMzfcgYZUZi58DGsTKwbdgayt22GSP

bXbYY3MggQIaONDzAJ8R9kFlQheQQAAOWGCAARrwdt23Bn8H7vfggBMueOEG

WOBBAAkU0EB9oBGUdXIFZJBABAEEsPjmmnfO+eeeh/55BBEk0Ph/E8Q9meQq

bbDABAN00EADFRRQ++2254777rr3jrvjFTTQwQCpz7u6QRut5/oEzA/g/PPQ

Ry/99NIz//oGrZpUUEAAOw==

'''

borderImageData = '''

R0lGODlhQABAAPcAAHx+fMTCxKSipOTi5JSSlNTS1LSytPTy9IyKjMzKzKyq

rOzq7JyanNza3Ly6vPz6/ISChMTGxKSmpOTm5JSWlNTW1LS2tPT29IyOjMzO

zKyurOzu7JyenNze3Ly+vPz+/OkAKOUA5IEAEnwAAACuQACUAAFBAAB+AFYd

QAC0AABBAAB+AIjMAuEEABINAAAAAHMgAQAAAAAAAAAAAKjSxOIEJBIIpQAA

sRgBMO4AAJAAAHwCAHAAAAUAAJEAAHwAAP+eEP8CZ/8Aif8AAG0BDAUAAJEA

AHwAAIXYAOfxAIESAHwAAABAMQAbMBZGMAAAIEggJQMAIAAAAAAAfqgaXESI

5BdBEgB+AGgALGEAABYAAAAAAACsNwAEAAAMLwAAAH61MQBIAABCM8B+AAAU

AAAAAAAApQAAsf8Brv8AlP8AQf8Afv8AzP8A1P8AQf8AfgAArAAABAAADAAA

AACQDADjAAASAAAAAACAAADVABZBAAB+ALjMwOIEhxINUAAAANIgAOYAAIEA

AHwAAGjSAGEEABYIAAAAAEoBB+MAAIEAAHwCACABAJsAAFAAAAAAAGjJAGGL

AAFBFgB+AGmIAAAQAABHAAB+APQoAOE/ABIAAAAAAADQAADjAAASAAAAAPiF

APcrABKDAAB8ABgAGO4AAJAAqXwAAHAAAAUAAJEAAHwAAP8AAP8AAP8AAP8A

AG0pIwW3AJGSAHx8AEocI/QAAICpAHwAAAA0SABk6xaDEgB8AAD//wD//wD/

/wD//2gAAGEAABYAAAAAAAC0/AHj5AASEgAAAAA01gBkWACDTAB8AFf43PT3

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q4sA5UGpEn4AAIg02xBk/0eD/358fx/4iADk5QASEgAAAALnHABkAACDqQB8

AMyINARkZA2DgwB8fBABHL0AAEUAqQAAAIAxKOMAPxIwAAAAAIScAOPxABIS

AAAAAIIAnQwA/0IAR3cAACwAAAAAQABAAAAI/wA/CBxIsKDBgwgTKlzIsKFD

gxceNnxAsaLFixgzUrzAsWPFCw8kDgy5EeQDkBxPolypsmXKlx1hXnS48UEH

CwooMCDAgIJOCjx99gz6k+jQnkWR9lRgYYDJkAk/DlAgIMICkVgHLoggQIPT

ighVJqBQIKvZghkoZDgA8uDJAwk4bDhLd+ABBmvbjnzbgMKBuoA/bKDQgC1F

gW8XKMgQOHABBQsMI76wIIOExo0FZIhM8sKGCQYCYA4cwcCEDSYPLOgg4Oro

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4s/PUgiQYcCG4BkC5P/ObpaBhwreq18nb3Z79+8Dwo9nL9I8evjWsdOX6D59

fPH71Xeef/kFyB93/sln4EP2Ebjegg31B5+CEDLUIH4PVqiQhOABqKFCF6qn

34cHcfjffCQaFOJtGaZYkIkUuljQigXK+CKCE3po40A0trgjjDru+EGPI/6I

Y4co7kikkAMBmaSNSzL5gZNSDjkghkXaaGIBHjwpY4gThJeljFt2WSWYMQpZ

5pguUnClehS4tuMEDARQgH8FBMBBBExGwIGdAxywXAUBKHCZkAIoEEAFp33W

QGl47ZgBAwZEwKigE1SQgAUCUDCXiwtQIIAFCTQwgaCrZeCABAzIleIGHDD/

oIAHGUznmXABGMABT4xpmBYBHGgAKGq1ZbppThgAG8EEAW61KwYMSOBAApdy

pNp/BkhAAQLcEqCTt+ACJW645I5rLrgEeOsTBtwiQIEElRZg61sTNBBethSw

CwEA/Pbr778ABywwABBAgAAG7xpAq6mGUUTdAPZ6YIACsRKAAbvtZqzxxhxn

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J4744oZzXUEDHQxwN7F5G7QRdXxPoPkAnHfu+eeghw665n1vIKhJBQUEADs=

'''

root = tk.Tk()

style = ttk.Style()

borderImage = tk.PhotoImage("borderImage", data=borderImageData)

focusBorderImage = tk.PhotoImage("focusBorderImage", data=focusBorderImageData)

style.element_create("RoundedFrame",

"image", borderImage,

("focus", focusBorderImage),

border=16, sticky="nsew")

style.layout("RoundedFrame",

[("RoundedFrame", {"sticky": "nsew"})])

frame1 = ttk.Frame(style="RoundedFrame", padding=10)

text1 = tk.Text(frame1, borderwidth=0, highlightthickness=0, wrap="word",

width=40, height=4)

text1.pack(fill="both", expand=True)

text1.bind("", lambda event: frame1.state(["focus"]))

text1.bind("", lambda event: frame1.state(["!focus"]))

text1.insert("end", "This widget has the focus")

frame2 = ttk.Frame(style="RoundedFrame", padding=10)

text2 = tk.Text(frame2, borderwidth=0, highlightthickness=0, wrap="word",

width=40, height=4)

text2.pack(fill="both", expand=True)

text2.bind("", lambda event: frame2.state(["focus"]))

text2.bind("", lambda event: frame2.state(["!focus"]))

text2.insert("end", "This widget does not have the focus")

root.configure(background="white")

frame1.pack(side="top", fill="both", expand=True, padx=20, pady=20)

frame2.pack(side="top", fill="both", expand=True, padx=20, pady=20)

frame1.focus_set()

root.mainloop()

1图像数据是base64编码的gif。 如果解码数据并将其保存为.gif文件，则可以对其进行编辑以使用所需的任何颜色。