python GUI demo（tkinter）

想了比较久用python做一个GUI的demo，还是用tkinter做一个小demo，版本python3.7下可行，代码如下：

  1 #!/usr/bin/env python3
  2 # -*- coding: utf-8 -*-
  3 
  4 from functools import partial
  5 import os
  6 from time import sleep
  7 from tkinter import *
  8 
  9 class Application:
 10 
 11     def __init__(self,initdir = None):
 12         self.initdir = initdir
 13 
 14     def ui_process(self):
 15         root = Tk()
 16         # 设置窗口位置
 17         root.title("gui demo5 ")
 18         self.root = root
 19         #self.center_window(root, 600, 565)
 20         #root.resizable(0, 0)  # 框体大小可调性，分别表示x,y方向的可变性
 21         self.label = Label(self.root,text='Directory Lister v1.1')
 22         self.label.pack()
 23 
 24         self.cwd = StringVar(self.root)
 25         #print('==='+str(self.cwd))
 26 
 27         self.dirl = Label(self.root,fg='blue',font=('Helvetica',12,'bold'))
 28         self.dirl.pack()
 29 
 30         self.dirfm = Frame(self.root)
 31         self.dirsb = Scrollbar(self.dirfm)
 32         self.dirsb.pack(side=RIGHT,fill=Y)
 33         self.dirs = Listbox(self.dirfm,height=15,width=50,yscrollcommand=self.dirsb.set)
 34         self.dirs.bind('<Double-1>',self.setDirAndGo)
 35         self.dirsb.config(command=self.dirs.yview)
 36         self.dirs.pack(side=LEFT,fill=BOTH)
 37         self.dirfm.pack()
 38 
 39         self.dirn = Entry(self.root,width=50,textvariable=self.cwd)
 40         self.dirn.bind('<Return>',self.doLS)
 41         self.dirn.pack()
 42 
 43         self.bfm = Frame(self.root)
 44         self.clr = Button(self.bfm,text='Clear',command=self.clrDir,activeforeground='white',activebackground='blue')
 45         self.ls = Button(self.bfm,text='List Directory',command=self.doLS,activeforeground='white',activebackground='green')
 46         self.quit = Button(self.bfm,text='QUIT',command=self.root.quit,activeforeground='white',activebackground='red')
 47         self.clr.pack(side=LEFT)
 48         self.ls.pack(side=LEFT)
 49         self.quit.pack(side=LEFT)
 50         self.bfm.pack()
 51 
 52         if self.initdir:
 53             self.cwd.set(os.curdir)
 54             self.doLS()
 55 
 56         root.mainloop()
 57 
 58     def center_window(self, root, w, h):
 59         """
 60         窗口居于屏幕中央
 61         :param root: root
 62         :param w: 窗口宽度
 63         :param h: 窗口高度
 64         :return:
 65         """
 66         # 获取屏幕 宽、高
 67         ws = root.winfo_screenwidth()
 68         hs = root.winfo_screenheight()
 69 
 70         # 计算 x, y 位置
 71         x = (ws/2) - (w/2)
 72         y = (hs/2) - (h/2)
 73         root.geometry('%dx%d+%d+%d' % (w, h, x, y))
 74 
 75     def doLS(self,ev=None):
 76         error =''
 77         tdir = self.cwd.get()
 78         if not tdir:
 79             tdir = os.curdir
 80         
 81         if not os.path.exists(tdir):
 82             error = tdir + ':no such file.'
 83         elif not os.path.isdir(tdir):
 84             error = tdir + ':no a directory.'
 85 
 86         if error:
 87             self.cwd.set(error)
 88             self.root.update()
 89             sleep(2)
 90             if not (hasattr(self,'last') \
 91                 and self.last ):
 92                 self.last = os.curdir
 93             self.cwd.set(self.last)
 94             self.dirs.config(selectbackground='LightSkyBlue')
 95             self.root.update()
 96             return
 97         
 98         self.cwd.set('fetching directory contents...')
 99         self.root.update()
100         dirlist = os.listdir(tdir)
101         dirlist.sort()
102         os.chdir(tdir)
103 
104         self.dirl.config(text=os.getcwd())
105         self.dirs.delete(0,END)
106         self.dirs.insert(END,os.curdir)
107         self.dirs.insert(END,os.pardir)
108         for eachFile in dirlist:
109             self.dirs.insert(END,eachFile)
110         self.cwd.set(os.getcwd())
111         self.dirs.config(selectbackground='LightSkyBlue')
112 
113     def setDirAndGo(self,ev=None):
114         print(str(self.cwd))
115         self.last = self.cwd.get()
116         self.dirs.config(selectbackground='red')
117         check = self.dirs.get(self.dirs.curselection())
118         if not check:
119             check = os.curdir
120         self.cwd.set(check)
121         self.doLS()
122     
123     def clrDir(self,ev=None):
124         self.cwd.set('')
125         
126 
127 def main():
128     app = Application()
129     app.ui_process()
130 
131 
132 if __name__ == "__main__":
133     main()

通过demo学习了entry，button，Listbox等控件的使用，学习了StringVar的使用。