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python - 当列表框中没有突出显示任何内容时，需要一种方法使 Tkinter 中的按钮变为禁用

问题描述

我正在编写的代码的目的是让它能够从数组和相应的列表框中删除项目。我希望能够在列表框中没有突出显示任何项目时禁用删除项目的按钮（因为否则当您尝试按下按钮并且没有选择任何内容时它会返回错误，错误如下所示。）

>>> Exception in Tkinter callback
  Traceback (most recent call last):
  File "G:\2Boys_stuff\lib\tkinter\__init__.py", line 1705, in __call__
    return self.func(*args)
  File "H:/The Quiet Apocalypse/Tests/test_13.py", line 14, in remove
    LB = int(lb[0])
IndexError: tuple index out of range

我正在使用的代码如下：

from tkinter import *
import tkinter.messagebox as box

global listbox
TF = True

inventorylist1 = [("Item1","1.0"),("Item2","0.25"),("Item3","0.25")]

def remove():
    global TF
    global listbox

    lb = listbox.curselection()
    LB = int(lb[0])


    del inventorylist1[LB]
    TF = False

    I(TF)

def IR():
    global windowir
    global listbox

    windowir = Tk()
    windowir.title( "IR" )
    windowir.resizable( 0, 0 )

    listframe = Frame( windowir )
    listbox = Listbox( listframe )

    for i in range(len(inventorylist1)):
        e = i+1
        listbox.insert(e, inventorylist1[i])

    Label_ir = Label( listframe, relief = "groove" )
    Label_ir.pack( side = TOP )


    btn_ir_1 = Button( listframe, text = "Remove", command = remove )
    btn_ir_1.pack(side = BOTTOM )

    listbox.pack(side = BOTTOM)
    listframe.pack(padx = 20, pady = 20)

    Label_ir.configure( text = "You are carrying: " )

    windowir.mainloop

def I(Tf):
    global windowir

    if Tf == True:
        windowi = Tk()
        windowi.title( "I" )
        windowi.resizable( 0, 0 )
        IR()
    else:
        windowir.destroy()
        IR()


I(TF)

标签： pythontkinter

解决方案

只需将try and except错误添加并显示为弹出窗口即可

def remove():
    global TF
    global listbox
    try:
       lb = listbox.curselection()
       LB = int(lb[0])


       del inventorylist1[LB]
       TF = False

       I(TF)
    except:
       popup = Tk()
       popup.wm_title("!")
       label = Label(popup, text=" ERROR")
       label.pack(side="top", fill="x", pady=10)
       B1 = Button(popup, text="Okay", command = popup.destroy)
       B1.pack()
       popup.mainloop()

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