def rbutton_down(event):    iid = list_view.identify_row(event.y)    if iid:        if iid not in list_view.selection():            list_view.selection_set(iid)            list_view.focus(iid)        path, selections = selected_files()        if path:            menu = Menu(list_view, tearoff=False)            menu.add_command(label='Open', command=open_current)            if len(list(selections))==1:                menu.add_command(label='Rename', command=rename_current)            menu.add_command(label='Delete', command=delete_current)            menu.post(event.x_root, event.y_root)

def rename_current():    path, selections = selected_files()    if path:        for fn in selections:            # 構(gòu)建頂層窗口作為對(duì)話框            rename_dlg = Toplevel(takefocus=True)            # 指定窗口標(biāo)題            rename_dlg.title('Rename')            # 禁止窗口尺寸調(diào)整            rename_dlg.resizable(width=False, height=False)            # 構(gòu)建Frame對(duì)象以容納Label和Entry對(duì)象            # 使用Frame可以分別調(diào)整Label/Entry區(qū)域和下面的按鈕區(qū)域            fn_frame = Frame(rename_dlg)            fn_frame.grid(row=0,column=0)            Label(fn_frame, text='File Name:').grid(row=0, column=0)            fn_var = StringVar()            fn_var.set(fn)            fn_entry = Entry(fn_frame, textvariable=fn_var)            fn_entry.grid(row=0, column=1)            # 構(gòu)建Frame對(duì)象以容納OK和Cancel按鈕            btn_frame = Frame(rename_dlg)            btn_frame.grid(row=1, column=0, sticky='e')            # 通過labmda表達(dá)式傳遞構(gòu)建按鈕控件時(shí)的對(duì)話框控件，路徑和文件名信息            # 修改后的文件名要在按下【OK】按鈕是通過fn_var.get獲取。            ok_btn = Button(btn_frame, text='OK',                            command=(lambda w=rename_dlg,p=path,s=fn: rename_ok(w,p,s,fn_var.get())))            ok_btn.grid(row=0, column=0)            # 取消按鈕直接銷毀窗口對(duì)象            cancel_btn=Button(btn_frame, text='Cancel', command=rename_dlg.destroy)            cancel_btn.grid(row=0, column=1)            # 限定rename_dlg接收鼠標(biāo)和鍵盤事件，這是實(shí)現(xiàn)模態(tài)對(duì)話框的關(guān)鍵。            rename_dlg.grab_set()            # 使對(duì)話框相對(duì)于root窗口居中            center_window(rename_dlg, root)            # 啟動(dòng)對(duì)話框主循環(huán)            rename_dlg.mainloop()            # 銷毀對(duì)話框窗口            rename_dlg.destroy()            # 更新文件列表            select_node(None)

def center_window(wnd, ref):    wnd.update()    width = wnd.winfo_width()    height = wnd.winfo_height()    if ref:        ref_width = ref.winfo_width()        ref_height = ref.winfo_height()        x = ref.winfo_x()        y = ref.winfo_y()        size = '%dx%d+%d+%d' % (width, height, x + (ref_width - width) / 2, y+(ref_height - height) / 2)    else:        s_width = wnd.winfo_screenwidth()        s_height = wnd.winfo_screenheight()        size = '%dx%d+%d+%d' % (width, height, (s_width - width) / 2, (s_height - height) / 2)    wnd.geometry(size)