import tkinter 
import os	 
from tkinter import *
from tkinter.messagebox import *
from tkinter.filedialog import *

class Notepad: 

	__root = Tk() 

	#default window width and height 
	__thisWidth = 100
	__thisHeight = 100
	__thisTextArea = Text(__root) 
	__thisMenuBar = Menu(__root) 
	__thisFileMenu = Menu(__thisMenuBar, tearoff = 0) 
	__thisEditMenu = Menu(__thisMenuBar, tearoff = 0) 
	__thisHelpMenu = Menu(__thisMenuBar, tearoff = 0) 
	
	#To add scrollbar 
	__thisScrollBar = Scrollbar(__thisTextArea)	 
	__file = None

	def __init__(self,**kwargs): 

		#Set icon 
		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() 
	
		#For left-alling 
		left = (screenWidth / 2) - (self.__thisWidth / 2) 
		
		#For right-allign 
		top = (screenHeight / 2) - (self.__thisHeight /2) 
		
		#For top and bottom 
		self.__root.geometry('%dx%d+%d+%d' % (self.__thisWidth, self.__thisHeight, left, top)) 

		#To make the textarea auto resizable 
		self.__root.grid_rowconfigure(0, weight = 1) 
		self.__root.grid_columnconfigure(0, weight = 1) 

		#Add controls
		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() 
		#exit() 

	def __showAbout(self): 
		showinfo("Notepad") 

	def __openFile(self): 
		
		self.__file = askopenfilename(defaultextension = ".txt", filetypes = [("All Files","*.*"), ("Text Documents","*.txt")]) 

		if self.__file == "": 
			
			#no file to open 
			self.__file = None
		else: 
			
			#Try to open the file 
			#set the window title 
			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: 
				
				#Try to save the file 
				file = open(self.__file,"w") 
				file.write(self.__thisTextArea.get(1.0,END)) 
				file.close() 
				
				#Change the window title 
				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): 

		#Run 
		self.__root.mainloop() 




#Main application 
notepad = Notepad(width = 1800, height = 1000) 
notepad.run() 
