from Tkinter import *

class ScrolledList:

    default = "(None)"

    def __init__(self, master, **options):

        # Create top frame, with scrollbar and listbox

        self.master = master

        self.frame = frame = Frame(master)

        self.frame.pack(fill="both", expand=1)

        self.vbar = vbar = Scrollbar(frame, name="vbar")

        self.vbar.pack(side="right", fill="y")

        self.listbox = listbox = Listbox(frame, exportselection=0,

            background="white")

        if options:

            listbox.configure(options)

        listbox.pack(expand=1, fill="both")

        # Tie listbox and scrollbar together

        vbar["command"] = listbox.yview

        listbox["yscrollcommand"] = vbar.set

        # Bind events to the list box

        listbox.bind("<ButtonRelease-1>", self.click_event)

        listbox.bind("<Double-ButtonRelease-1>", self.double_click_event)

        listbox.bind("<ButtonPress-3>", self.popup_event)

        listbox.bind("<Key-Up>", self.up_event)

        listbox.bind("<Key-Down>", self.down_event)

        # Mark as empty

        self.clear()

    def close(self):

        self.frame.destroy()

    def clear(self):

        self.listbox.delete(0, "end")

        self.empty = 1

        self.listbox.insert("end", self.default)

    def append(self, item):

        if self.empty:

            self.listbox.delete(0, "end")

            self.empty = 0

        self.listbox.insert("end", str(item))

    def get(self, index):

        return self.listbox.get(index)

    def click_event(self, event):

        self.listbox.activate("@%d,%d" % (event.x, event.y))

        index = self.listbox.index("active")

        self.select(index)

        self.on_select(index)

        return "break"

    def double_click_event(self, event):

        index = self.listbox.index("active")

        self.select(index)

        self.on_double(index)

        return "break"

    menu = None

    def popup_event(self, event):

        if not self.menu:

            self.make_menu()

        menu = self.menu

        self.listbox.activate("@%d,%d" % (event.x, event.y))

        index = self.listbox.index("active")

        self.select(index)

        menu.tk_popup(event.x_root, event.y_root)

    def make_menu(self):

        menu = Menu(self.listbox, tearoff=0)

        self.menu = menu

        self.fill_menu()

    def up_event(self, event):

        index = self.listbox.index("active")

        if self.listbox.selection_includes(index):

            index = index - 1

        else:

            index = self.listbox.size() - 1

        if index < 0:

            self.listbox.bell()

        else:

            self.select(index)

            self.on_select(index)

        return "break"

    def down_event(self, event):

        index = self.listbox.index("active")

        if self.listbox.selection_includes(index):

            index = index + 1

        else:

            index = 0

        if index >= self.listbox.size():

            self.listbox.bell()

        else:

            self.select(index)

            self.on_select(index)

        return "break"

    def select(self, index):

        self.listbox.focus_set()

        self.listbox.activate(index)

        self.listbox.selection_clear(0, "end")

        self.listbox.selection_set(index)

        self.listbox.see(index)

    # Methods to override for specific actions

    def fill_menu(self):

        pass

    def on_select(self, index):

        pass

    def on_double(self, index):

        pass

def test():

    root = Tk()

    root.protocol("WM_DELETE_WINDOW", root.destroy)

    class MyScrolledList(ScrolledList):

        def fill_menu(self): self.menu.add_command(label="pass")

        def on_select(self, index): print "select", self.get(index)

        def on_double(self, index): print "double", self.get(index)

    s = MyScrolledList(root)

    for i in range(30):

        s.append("item %02d" % i)

    return root

def main():

    root = test()

    root.mainloop()

if __name__ == '__main__':

    main()