Notepad

import tkinter

import os

from tkinter import *

from tkinter.messagebox import *

from tkinter.filedialog import *

class Notepad:

__root = Tk()

__thisWidth = 300

__thisHeight = 300

__thisTextArea = Text(__root)

__thisMenuBar = Menu(__root)

__thisFileMenu = Menu(__thisMenuBar, tearoff=0)

__thisEditMenu = Menu(__thisMenuBar, tearoff=0)

__thisHelpMenu = Menu(__thisMenuBar, tearoff=0)

__thisScrollBar = Scrollbar(__thisTextArea)

__file = None

def __init__(self,**kwargs):

try:

self.__root.wm_iconbitmap("Notepad.ico")

except:

pass

try:

self.__thisWidth = kwargs['width']

except KeyError:

pass

try:

self.__thisHeight = kwargs['height']

except KeyError:

pass

self.__root.title("Untitled - Notepad")

screenWidth = self.__root.winfo_screenwidth()

screenHeight = self.__root.winfo_screenheight()

left = (screenWidth / 2) - (self.__thisWidth / 2)

top = (screenHeight / 2) - (self.__thisHeight /2)

self.__root.geometry('%dx%d+%d+%d' % (self.__thisWidth,

self.__thisHeight,

left, top))

self.__root.grid_rowconfigure(0, weight=1)

self.__root.grid_columnconfigure(0, weight=1)

self.__thisTextArea.grid(sticky = N + E + S + W)

self.__thisFileMenu.add_command(label="New",

command=self.__newFile)

self.__thisFileMenu.add_command(label="Open",

command=self.__openFile)

self.__thisFileMenu.add_command(label="Save",

command=self.__saveFile)

self.__thisFileMenu.add_separator()

self.__thisFileMenu.add_command(label="Exit",

command=self.__quitApplication)

self.__thisMenuBar.add_cascade(label="File",

menu=self.__thisFileMenu)

self.__thisEditMenu.add_command(label="Cut",

command=self.__cut)

self.__thisEditMenu.add_command(label="Copy",

command=self.__copy)

self.__thisEditMenu.add_command(label="Paste",

command=self.__paste)

self.__thisMenuBar.add_cascade(label="Edit",

menu=self.__thisEditMenu)

self.__thisHelpMenu.add_command(label="About Notepad",

command=self.__showAbout)

self.__thisMenuBar.add_cascade(label="Help",

menu=self.__thisHelpMenu)

self.__root.config(menu=self.__thisMenuBar)

self.__thisScrollBar.pack(side=RIGHT,fill=Y)

self.__thisScrollBar.config(command=self.__thisTextArea.yview)

self.__thisTextArea.config(yscrollcommand=self.__thisScrollBar.set)

def __quitApplication(self):

self.__root.destroy()

def __showAbout(self):

showinfo("Notepad","Mrinal Verma")

def __openFile(self):

self.__file = askopenfilename(defaultextension=".txt",

filetypes=[("All Files","*.*"),

("Text Documents","*.txt")])

if self.__file == "":

self.__file = None

else:

self.__root.title(os.path.basename(self.__file) + " - Notepad")

self.__thisTextArea.delete(1.0,END)

file = open(self.__file,"r")

self.__thisTextArea.insert(1.0,file.read())

file.close()

def __newFile(self):

self.__root.title("Untitled - Notepad")

self.__file = None

self.__thisTextArea.delete(1.0,END)

def __saveFile(self):

if self.__file == None:

self.__file = asksaveasfilename(initialfile='Untitled.txt',

defaultextension=".txt",

filetypes=[("All Files","*.*"),

("Text Documents","*.txt")])

if self.__file == "":

self.__file = None

else:

file = open(self.__file,"w")

file.write(self.__thisTextArea.get(1.0,END))

file.close()

self.__root.title(os.path.basename(self.__file) + " - Notepad")

else:

file = open(self.__file,"w")

file.write(self.__thisTextArea.get(1.0,END))

file.close()

def __cut(self):

self.__thisTextArea.event_generate("<<Cut>>")

def __copy(self):

self.__thisTextArea.event_generate("<<Copy>>")

def __paste(self):

self.__thisTextArea.event_generate("<<Paste>>")

def run(self):

self.__root.mainloop()

notepad = Notepad(width=600,height=400)

notepad.run()