python tkinter listbox事件绑定

Question

我无法使用python/tkinter获取事件绑定.我只是想点击并打印位置,但每次我这样做,结果都是"-1".

这是我的代码

from Tkinter import *
import Tkinter

class make_list(Tkinter.Listbox):

    def __init__(self,master, **kw):
        frame = Frame(master)
        frame.pack()
        self.build_main_window(frame)

        kw['selectmode'] = Tkinter.SINGLE
        Tkinter.Listbox.__init__(self, master, kw)
        master.bind('<Button-1>', self.click_button)
        master.curIndex = None

    #display the clicked location
    def click_button(self, event):
        self.curIndex = self.nearest(event.x)
        print self.curIndex

    #display the window, calls the listbox
    def build_main_window(self, frame):
        self.build_listbox(frame)

    #listbox
    def build_listbox(self, frame):
        listbox = Listbox(frame)
        for item in ["one", "two", "three", "four"]:
            listbox.insert(END, item)    
        listbox.insert(END, "a list entry")
        listbox.pack()
        return

if __name__ == '__main__':
    tk = Tkinter.Tk()
    make_list(tk)
    tk.mainloop()

更新的代码 - 我摆脱了框架,但我似乎无法弄清楚为什么我在函数click_button中的第一个print语句得到-1

from Tkinter import *
import Tkinter

class make_list(Tkinter.Listbox):

    #display the clicked location
    def click_button(self, event):
        ##this block works
        w = event.widget
        index = int(w.curselection()[0])
        value = w.get(index)
        print value
        ##this doesn't
        self.curIndex = self.nearest(event.y)
        print self.curIndex
        self.curIndex = event.widget.nearest(event.y)
        print self.curIndex

    #display the window, calls the listbox
    def build_main_window(self):
        self.build_listbox()

    #listbox
    def build_listbox(self):
        listbox = Listbox()
        listbox.bind('<<ListboxSelect>>', self.click_button)
        for item in ["one", "two", "three", "four"]:
            listbox.insert(END, item)    
        listbox.insert(END, "a list entry")
        listbox.pack()
        return

if __name__ == '__main__':
    tk = Tkinter.Tk()
    start = make_list(tk)
    start.build_main_window()
    start.mainloop()

Answer 1

在答案的评论中,您要求最佳实践.最佳做法是绑定到<<ListboxSelect>>将在列表框中选择项目后立即触发.

这个答案对一个类似问题有一个例子.