在 tkinter 中将列表框变量添加到标签

Question

我在将列表框信息获取到标签没有标签相互重叠时遇到问题，我尝试使用“.configure()”和“label['text'] =”来更改标签的输出，但是旧信息保留在屏幕上

import tkinter as tk

window = tk.Tk()
window.geometry('1000x500')

lbx_info = ['short frase', 'medium sentence', 'the longest sentence in the list']
lbl_bg = ['#ff0000', '#ffff00', '#00cc00']

lbx = tk.Listbox(window, font='Arial 20', bd=10)
for e in lbx_info:
    lbx.insert(tk.END, e)
lbx.place(x=0, y=0)


def show(pos):
    name_lbl = tk.Label(window, font='Arial 16')
    name_lbl.configure(text=f'Nome: {lbx_info[pos[0]]}', bg=f'{lbl_bg[pos[0]]}')
    name_lbl.place(x=500, y=0)


lbx.bind('<<ListboxSelect>>', lambda m: show(lbx.curselection()))
window.mainloop()

有办法吗？

Answer 1

正如@BryanOakley 所指出的，每次调用该函数时，您都会创建一个新的Label。最简单的解决方法是将name_lbl = tk.Label(...) 移到函数之外。将name_lbl.place(...) 也移到函数之外也不是一个坏主意。

所以你的代码应该是这样的：

import tkinter as tk

window = tk.Tk()
window.geometry('1000x500')

lbx_info = ['short frase', 'medium sentence', 'the longest sentence in the list']
lbl_bg = ['#ff0000', '#ffff00', '#00cc00']

lbx = tk.Listbox(window, font='Arial 20', bd=10)
for e in lbx_info:
    lbx.insert(tk.END, e)
lbx.place(x=0, y=0)


name_lbl = tk.Label(window, font='Arial 16')
name_lbl.place(x=500, y=0)
def show(pos):
    name_lbl.configure(text=f'Nome: {lbx_info[pos[0]]}', bg=f'{lbl_bg[pos[0]]}')


lbx.bind('<<ListboxSelect>>', lambda m: show(lbx.curselection()))
window.mainloop()