python 实现GUI(图形用户界面)编程详解

#!/usr/bin/python
# -*- coding: UTF-8 -*-

import Tkinter
top = Tkinter.Tk()
# 进入消息循环
top.mainloop()

#!/usr/bin/env python

import os
from time import sleep
from Tkinter import *

class DirList(object):
  def __init__(self, initdir=None):
    self.top = Tk()
    self.label = Label(self.top,
      text='Directory Lister v1.2')
    self.label.pack()

    self.cwd=StringVar(self.top)

    self.dirl = Label(self.top, fg='blue',
      font=('Helvetica', 12, 'bold'))
    self.dirl.pack()

    self.dirfm = Frame(self.top)
    self.dirsb = Scrollbar(self.dirfm)
    self.dirsb.pack(side=RIGHT, fill=Y)
    self.dirs = Listbox(self.dirfm, height=15,
      width=50, yscrollcommand=self.dirsb.set)
    self.dirs.bind('<Double-1>', self.setdirandgo)
    self.dirsb.config(command=self.dirs.yview)
    self.dirs.pack(side=LEFT, fill=BOTH)
    self.dirfm.pack()

    self.dirn = Entry(self.top, width=50,
      textvariable=self.cwd)
    self.dirn.bind('<Return>', self.dols)
    self.dirn.pack()

    self.bfm = Frame(self.top)
    self.clr = Button(self.bfm, text='Clear',
      command=self.clrdir,
      activeforeground='white',
      activebackground='blue')
    self.ls = Button(self.bfm,
      text='List Directory',
      command=self.dols,
      activeforeground='white',
      activebackground='green')
    self.quit = Button(self.bfm, text='Quit',
      command=self.top.quit,
      activeforeground='white',
      activebackground='red')
    self.clr.pack(side=LEFT)
    self.ls.pack(side=LEFT)
    self.quit.pack(side=LEFT)
    self.bfm.pack()

    if initdir:
      self.cwd.set(os.curdir)
      self.dols()

  def clrdir(self, ev=None):
    self.cwd.set('')

  def setdirandgo(self, ev=None):
    self.last = self.cwd.get()
    self.dirs.config(selectbackground='red')
    check = self.dirs.get(self.dirs.curselection())
    if not check:
      check = os.curdir
    self.cwd.set(check)
    self.dols()

  def dols(self, ev=None):
    error = ''
    tdir = self.cwd.get()
    if not tdir:
      tdir = os.curdir

    if not os.path.exists(tdir):
      error = tdir + ': no such file'
    elif not os.path.isdir(tdir):
      error = tdir + ': not a directory'

    if error:
      self.cwd.set(error)
      self.top.update()
      sleep(2)
      if not (hasattr(self, 'last') \
        and self.last):
          self.last = os.curdir
      self.cwd.set(self.last)
      self.dirs.config(
        selectbackground='LightSkyBlue')
      self.top.update()
      return

    self.cwd.set(
      'FETCHING DIRECTORY CONTENTS...')
    self.top.update()
    dirlist = os.listdir(tdir)
    dirlist.sort()
    os.chdir(tdir)
    self.dirl.config(text=os.getcwd())
    self.dirs.delete(0, END)
    self.dirs.insert(END, os.curdir)
    self.dirs.insert(END, os.pardir)
    for eachFile in dirlist:
      self.dirs.insert(END, eachFile)
    self.cwd.set(os.curdir)
    self.dirs.config(
      selectbackground='LightSkyBlue')

def main():
  d = DirList(os.curdir)
  mainloop()

if __name__ == '__main__':
  main()