使用tkinter列表框从实例更改属性

Question

我是新来的，而且是tkinter的初学者。我想从类更改特定实例的属性。要选择实例，我想使用一个列表框。这是用于创建列表框的代码的简单版本。是否可以更改所选实例的flag属性（如果启用了apple，请将apple.flag更改为1）？

谢谢！

import tkinter as tk

class fruits:
    all_fruits = []
    def __init__(self,name):
        self.flag = 0
        self.name = name
        fruits.all_fruits.append(self.name)

root = tk.Tk()
#Main window
frame = tk.Frame(root)
frame.pack()
#Fruits selection
selectorlist = tk.Listbox(frame)
selectorlist.pack()

#Fruits creation
apple = fruits('apple')
pear = fruits('pear')

#List creation
for item in fruits.all_fruits:
        selectorlist.insert(tk.END, item)

#Effect on click
selectorlist.bind("<Button-1>",lambda *a: print("Flag is 1"))
root.mainloop()

Answer 1

可以进行一些更改，我试图添加尽可能多的注释来帮助解释原因。

import tkinter as tk

class fruits:
    def __init__(self, name):
        self.flag = 0
        self.name = name

def clicked(e):
    # Function that gets the selected value, then changes the flag property and prints the flag.
    selected = e.widget.get(e.widget.curselection()) # Gets the index of the current selection and retrieves it's value.
    all_fruits[selected].flag = 1
    print(selected, "changed to", all_fruits[selected].flag)

    test() # This is a function call to print the entire dictionary so changes can be seen.

def test():
    # Function to print the all_fruits dictionary.
    for k,v in all_fruits.items():
        print(k, v.flag)
    print()

root = tk.Tk()
#Main window
frame = tk.Frame(root)
frame.pack()
#Fruits selection
selectorlist = tk.Listbox(frame)
selectorlist.pack()

#Fruits creation
names = ['apple', 'pear', 'grape', 'orange', 'pineapple'] # List of fruit names.

all_fruits = {} # Define a dictionary for all fruits.
for name in names:
    # Add each name as a dictionary key with the class as its value.
    all_fruits[name] = fruits(name)

#List creation
for item in all_fruits:
    # Insert each dictionary key into the listbox
    selectorlist.insert(tk.END, item)

#Effect on click
selectorlist.bind("<<ListboxSelect>>", clicked) # Changed this to call a function

root.mainloop()

要实现添加/删除功能，最好重组类，以便有一个单独的类来管理所有结果。

我添加了一些添加/删除功能，以后可能会有所帮助：

import tkinter as tk

class fruit:
    """A Class for each fruit."""
    def __init__(self, name):
        self.flag = 0
        self.name = name

    def change(self, value):
        self.flag = value

class fruits:
    """A Class for all the fruits."""
    def __init__(self):
        self.all_fruits = {}

    def add(self, listbox, name):
        self.all_fruits[name] = fruit(name)
        listbox.insert(tk.END, name)
        print("Added", name)

    def remove(self, listbox, name):
        indx = listbox.get(0, tk.END).index(name)
        listbox.delete(indx)
        del self.all_fruits[name]
        print("Deleted", name)

    def change(self, name, value):
        self.all_fruits[name].change(value)

def clicked(e):
    # Function that gets the selected value, then changes the flag property and prints the flag.
    selected = e.widget.get(e.widget.curselection()) # Gets the index of the current selection and retrieves it's value.
    Fruits.change(selected, 1)
    print(selected, "changed to 1")

    test() # This is a function call to print the entire dictionary so changes can be seen.

def test():
    # Function to print the all_fruits dictionary.
    for k,v in Fruits.all_fruits.items():
        print(k, v.flag)
    print()

root = tk.Tk()
#Main window
frame = tk.Frame(root)
frame.pack()
#Fruits selection
selectorlist = tk.Listbox(frame)
selectorlist.pack()

#Fruits creation
names = ['apple', 'pear', 'grape', 'orange', 'pineapple', 'carrot'] # List of fruit names.

Fruits = fruits() # Creates an instance of fruits

for name in names:
    Fruits.add(selectorlist, name) # Add each name with the class's add function.

Fruits.remove(selectorlist, "carrot")

#Effect on click
selectorlist.bind("<<ListboxSelect>>", clicked) # Changed this to call a function

root.mainloop()