Question

现在我知道已经存在类似的问题Python Tkinter: OptionMenu modify dropdown list width但是这对我没有帮助。

我正在尝试使OptionMenu小部件的下拉菜单的宽度响应。这意味着宽度将始终与OptionMenu的宽度匹配。如下面的代码所示，我尝试了一些东西，但它们不适用于子菜单，它将始终保持固定的宽度。有没有办法改变它？

import tkinter as tk

root = tk.Tk()

var = tk.StringVar()
var.set('First')

option = tk.OptionMenu(root, var, 'First', 'Second', 'Third')
option.configure(indicatoron = False)

option.pack(expand = True, fill = tk.X)

# Sub-menu config
submenu = option['menu']
submenu.configure(width = 50) # Can't use width
submenu.pack_configure(expand = True, fill = tk.X) # Can't use pack_configure

root.mainloop()

Answer 1

虽然无法明确设置宽度，但如果真的必须使用tkinter，那么可以添加hacky变通方法来填充这些内容。例如：

import tkinter as tk
from tkinter import font as tkFont

def resizer(event=None):
    print("Resize")
    widget = event.widget
    menu = widget['menu']

    req_width = widget.winfo_width()-10
    menu_width = menu.winfo_reqwidth()

    cur_label = menu.entrycget(0, "label")
    cur_label = cur_label.rstrip() # strip off existing whitespace

    font = tkFont.Font() # set font size/family here
    resized = False
    while not resized:
        difsize = req_width - menu_width # check how much we need to add in pixels
        tempsize = 0
        tempstr = ""
        while  tempsize < difsize:
            tempstr += " " # add spaces into a string one by one
            tempsize = font.measure(tempstr) #measure until big enough
        menu.entryconfigure(0, label=cur_label + tempstr) # reconfigure label
        widget.update_idletasks() # we have to update to get the new size
        menu_width = menu.winfo_reqwidth() # check if big enough
        cur_label = menu.entrycget(0, "label") # get the current label for if loop needs to repeat
        if menu_width >= req_width: # exit loop if big enough
            resized = True

root = tk.Tk()

var = tk.StringVar()
var.set('First')

option = tk.OptionMenu(root, var, 'First', 'Second', 'Third')
option.bind("<Configure>", resizer) # every time the button is resized then resize the menu
option.configure(indicatoron = False)

option.pack(expand = True, fill = tk.X)

root.mainloop()

这基本上只是填充第一个菜单项，直到菜单足够大。然而，tkinter报告的宽度似乎确实存在一些差异，因此我的req_width = widget.winfo_width()-10偏移靠近顶部。

然而，这并不总是完美的匹配大小，而测试我的空间似乎需要3个像素的宽度，所以它可以随时出1或2个像素。

OptionMenu修改下拉列表宽度以匹配OptionMenu宽度

1 个答案: