Python 中从 Tkinter 列表框中获得多项选择的问题

Question

这是我今天早些时候提出的同一个问题，你们中的一些人试图帮助我解决这个问题，但我无法让它发挥作用。我要做的就是在单击列表框时使用我所做的多项选择来填充“ichose”。

import Tkinter as tk
from Tkinter import *
global ichose

class App(tk.Frame):
    def __init__(self, master):
        tk.Frame.__init__(self,master)
        self.master=master
        self.grid()
        self.ichose = ()

        self.l = Listbox(self, height=10, selectmode=EXTENDED)
        # Selectmode can be SINGLE, BROWSE, MULTIPLE or EXTENDED. Default BROWSE
        self.l.grid(column=0, row=0, sticky=(N,W,E,S))
        self.l.bind("Double-Button-1", self.entered)

        s = Scrollbar(self, orient=VERTICAL, command=self.l.yview)
        s.grid(column=0, row=0, sticky=(N,S,E))
        self.l['yscrollcommand'] = s.set

        for i in range(1,101):
            self.l.insert('end', 'Line %d of 100' % i)


    def entered(self, event):
        self.ichose = self.selection_get()
        self.ichose = ('hello')

root=tk.Tk()
root.title('Listbox Problem')
root.geometry('200x200')
app=App(root)
root.mainloop()

print app.ichose

无论我做什么，“ichose”都会以空元组 () 的形式出现。 很明显，从未调用过“entered”函数，因为我从未见过测试字符串“hello”。

我也不知道“Do​​uble-Button-”、“”等中的各种选项是什么。在哪里可以找到每个选项的列表和说明？

如果有人可以修改我的程序以使“print ichose”正常工作，我将不胜感激。您可以从我的程序中看到，我并不真正知道自己在做什么，但很想学习。谢谢。

Answer 1

我终于找到了自己问题的答案。如果您想从列表框中捕获多个响应，这非常有用。我评论了很多。希望对您有所帮助！

import Tkinter as tk
from Tkinter import *

class App(tk.Frame):
    def __init__(self, master):
        tk.Frame.__init__(self,master)
        self.master=master
        self.grid()
        self.ichose = []

        self.l = Listbox(self, height=10, selectmode=MULTIPLE)
        # Selectmode can be SINGLE, BROWSE, MULTIPLE or EXTENDED. Default BROWSE
        self.l.grid(column=0, row=0, sticky=(N,W,E,S))

        s = Scrollbar(self, orient=VERTICAL, command=self.l.yview)
        s.grid(column=0, row=0, sticky=(N,S,E))
        self.l['yscrollcommand'] = s.set

        for i in range(1,101):
            self.l.insert('end', 'Line %d of 100' % i)

        # Create Textbox that will display selected items from list
        self.selected_list = Text(self,width=20,height=10,wrap=WORD)
        self.selected_list.grid(row=12, column=0, sticky=W)        

        # Now execute the poll() function to capture selected list items
        self.ichose = self.poll()

    def poll(self):
        items =[]
        self.ichose = []
        # Set up an automatically recurring event that repeats after 200 millisecs
        self.selected_list.after(200, self.poll)
        # curselection retrieves the selected items as a tuple of strings. These
        # strings are the list indexes ('0' to whatever) of the items selected.
        # map applies the function specified in the 1st parameter to every item
        # from the 2nd parameter and returns a list of the results. So "items"
        # is now a list of integers
        items = map(int,self.l.curselection())

        # For however many values there are in "items":
        for i in range(len(items)):
            # Use each number as an index and get from the listbox the actual
            # text strings corresponding to each index, and append each to
            # the list "ichose".
            self.ichose.append(self.l.get(items[i]))
        # Write ichose to the textbox to display it.
        self.update_list()
        return self.ichose

    def update_list(self):
        self.selected_list.delete(0.0, END)
        self.selected_list.insert(0.0, self.ichose)


root=tk.Tk()
root.title('Listbox Multi-Capture')
root.geometry('200x340')
app=App(root)
root.mainloop()

print app.ichose

Answer 2

# ----------------[ Listbox EXAMPLE ]----------------

    self.sarcCountries = (
        "Bangladesh",
        "India",
        "Pakistan",
        "Nepal",
        "Bhutan",
        "Sri Lanka",
        "Afghanistan"
    )

    self.listData = StringVar(value = self.sarcCountries)

    self.listbox = Listbox(
        master           = self,
        height           = 10,
        listvariable     = self.listData,
        selectmode       = MULTIPLE,
        selectbackground = "#BC80CC"
    )

    self.listbox.bind("<<ListboxSelect>>", self.OnListboxSelectionChanged)

    self.listbox.pack(fill = BOTH, expand = 0, padx = 10, pady = 10)
# ----------------[ Listbox EXAMPLE ]----------------


def OnListboxSelectionChanged(self, val):
    # NOTE: If your listbox's select mode is MULTIPLE, then you may use this portion of code
    selections = val.widget.curselection()

    print("---------------------------")

    if (selections != ()):
        for index in selections:
            print(self.sarcCountries[int(index)])

    print("---------------------------")