"在 for 循环中创建的组合框中的 python tkinter 参考"

Question

到目前为止，我的代码，我想根据组合框和选择导入图像。 我需要参考 self.box。 例如 self.box1、self.box2 等，或者如果可能的话，以某种方式从循环中附加它们

from Tkinter import *
import ttk


class Application(Frame):
    def __init__(self, master):
        Frame.__init__(self, master, relief="sunken", border=1)
        self.master = master
        self.grid()
        self.create_widgets()

    def create_widgets(self):
        for i in range(9):
            self.box = ttk.Combobox(self, state="readonly")
            self.box["values"] = ("apple", "bannana", "cherry", "raspberry", "blueberry", "lemon", "tomato", "potato",
                                  "None")
            self.box.grid(row=1+i, column=2, pady=1, padx=1, sticky=E+W+N+S)
            self.box.current(i)
            self.box.bind("<<ComboboxSelected>>", self.change_icon)
            print self.box["values"][i]


    def change_icon(self, event):
        self.var_Selected = self.box.current()
        print "The user selected value now is:"
        print self.var_Selected

root = Tk()
root.title("Random title")
root.geometry("500x250")
app = Application(root)
root.mainloop()

Answer 1

您可以让您的应用程序保留一个dict对象（或列表，但是实现高度依赖于索引），将框存储在dict中，并以i为键：

class Application(Frame):
    def __init__(self, master):
        Frame.__init__(self, master, relief="sunken", border=1)
        # Various initialization code here
        self.box_dict = {}

    def create_widgets(self):
        for i in range(9):
            box = ttk.Combobox(self, state="readonly")
            # Do various things with your box object here
            self.box_dict[i] = box
            # Only complication is registering the callback
            box.bind("<<ComboboxSelected>>",
                         lambda event, i=i: self.change_icon(event, i))


    def change_icon(self, event, i):
        self.var_Selected = self.box_dict[i].current()
        print "The user selected value now is:"
        print self.var_Selected

然后通过self.box_dict[0]等访问盒子。

编辑我对bind和change_icon方法进行了更新，以使每个框在触发事件时将其索引号发送到change_icon 。 Edit2将实现更改为使用dict而不是list ，这似乎更可靠。

Answer 2

对于那些寻找更明确的解决方案的人来说，这里有一个完全有效的解决方案（Python 3.0+）......记住孩子们，索引从 0 开始。

from tkinter import *
from tkinter import ttk

class Application(Frame):
    def __init__(self, master):
        Frame.__init__(self, master, relief="sunken", border=1)
        self.master = master
        self.grid()

        self.box_dict = {}

        def create_widgets():
            for i in range(9):
                box = ttk.Combobox(self, state="readonly")
                box["values"] = (
                                 "None",
                                 "Apple",
                                 "Bannana",
                                 "Cherry",
                                 "Raspberry",
                                 "Blueberry",
                                 "Lemon",
                                 "Tomato",
                                 "Potato"
                                 )
                box.grid(row=1 + i, column=2, pady=1, padx=1, sticky=E + W + N + S)
                box.current(0)
                self.box_dict[i] = box
                box.bind("<<ComboboxSelected>>",
                         lambda event, i=i: change_icon(event, i))
                print(f"Option {i} is:",box["values"][i])

        def change_icon(event, i):
            var_Selected = self.box_dict[i].current()
            print(f"The user selected of box {i} is:", var_Selected)

        create_widgets()


root = Tk()
root.title("Random title")
root.geometry("500x250")
app = Application(root)
root.mainloop()