Tkinter Canvas矩形的disabledwidth参数为何无法生效？

我希望Canvas中的矩形处于disabled状态时，其轮廓宽度能变大，因此设置了disabledwidth=4参数。但切换至disabled状态后，轮廓宽度仍为1而非4。而当鼠标移至矩形上切换为active状态时，activewidth=4能正常生效，轮廓宽度变为4。

复现代码：

import tkinter as tk
def disabled():
    canvas.itemconfig(rect, state="disabled")
def normal():
    canvas.itemconfig(rect, state="normal")
root    = tk.Tk()
canvas  = tk.Canvas(root, height=250, width=250)
button1 = tk.Button(root, text="change rectangle to state disabled", command=disabled)
button2 = tk.Button(root, text="change rectangle to state normal"  , command=normal  )
rect = canvas.create_rectangle(40, 40, 180, 180,
                fill           = "red",
                activefill     = "green2",
                activeoutline  = "green3",
                activewidth    = 4,
                disabledfill   = "grey",
                disabledoutline= "grey2",
                disabledwidth  = 4
                )
canvas.grid()
button1.grid()
button2.grid()
root.mainloop()

Tkinter的Canvas组件中，disabledwidth是未被官方实现的参数，即使设置了也不会生效——Canvas仅支持width（默认宽度）和activewidth（鼠标悬停时的宽度）这两个与轮廓宽度相关的状态参数。

要实现disabled状态下轮廓变宽的效果，需要在切换状态时手动修改width参数：

修改后的代码 #

import tkinter as tk

# 存储矩形初始轮廓宽度
INITIAL_WIDTH = 1

def set_disabled():
    # 切换为disabled状态时，同时设置轮廓宽度为4
    canvas.itemconfig(rect, state="disabled", width=4)

def set_normal():
    # 切回normal状态时，恢复初始轮廓宽度
    canvas.itemconfig(rect, state="normal", width=INITIAL_WIDTH)

root = tk.Tk()
canvas = tk.Canvas(root, height=250, width=250)
button1 = tk.Button(root, text="切换矩形为disabled状态", command=set_disabled)
button2 = tk.Button(root, text="切换矩形为normal状态", command=set_normal)

rect = canvas.create_rectangle(40, 40, 180, 180,
                fill="red",
                activefill="green2",
                activeoutline="green3",
                activewidth=4,
                disabledfill="grey",
                disabledoutline="grey2",
                width=INITIAL_WIDTH  # 显式设置初始宽度
                )

canvas.grid()
button1.grid()
button2.grid()
root.mainloop()

说明 #

• 切换至disabled状态时，手动将width设为4，实现轮廓变宽的效果；切回normal状态时，恢复初始宽度。
• activewidth依然正常工作：鼠标悬停在矩形上时，会自动覆盖当前的width值为4，移开后恢复对应状态的宽度（disabled时为4，normal时为1）。

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