#Import os library
import os
#import everything from tkinter
from tkinter import *
#To get the space above the message
from tkinter.messagebox import *
#To get the dialog box to open when required
from tkinter.filedialog import *
class Notepad:
   # Set up the root widget
   __root = Tk()
   __thisWidth = 500
   __thisHeight = 700
   __thisTextArea = Text(__root)
   __thisMenuBar = Menu(__root)
   __thisFileMenu = Menu(__thisMenuBar, tearoff=0)
   __thisEditMenu = Menu(__thisMenuBar, tearoff=0)
   __thisHelpMenu = Menu(__thisMenuBar, tearoff=0)
   __thisCommandMenu = Menu(__thisMenuBar, tearoff=0)
   # To add scrollbar
   __thisScrollBar = Scrollbar(__thisTextArea)
   __file = None
   def __init__(self,**kwargs):
      # icon
      try:
         self.__root.wm_iconbitmap("Notepad.ico")
      except:
         pass
   # Set window size as mentioned above (the default is 300x300)
  
      self.__thisWidth = kwargs['width']
      pass
   try:
      self.__thisHeight = kwargs['height']
    
      pass
      # the window text
      self.__root.title("Untitled-Notepad")
      # Center the window
      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 (widget)
      self.__thisTextArea.grid(sticky = N + E + S + W)
      # To open new file
      self.__thisFileMenu.add_command(label="New",
   command=self.__newFile)
      # To open a already existing file
      self.__thisFileMenu.add_command(label="Open",
   command=self.__openFile)
      # To save current file
      self.__thisFileMenu.add_command(label="Save",
   command=self.__saveFile)
      # To create a line in the dialog
      self.__thisFileMenu.add_separator()
      self.__thisFileMenu.add_command(label="Exit",
   command=self.__quitApplication)
      self.__thisMenuBar.add_cascade(label="File", menu=self.__thisFileMenu)
      # To give a feature of cut
      self.__thisEditMenu.add_command(label="Cut",
   command=self.__cut)
      # to give a feature of copy
      self.__thisEditMenu.add_command(label="Copy",
   command=self.__copy)
      # To give a feature of paste
      self.__thisEditMenu.add_command(label="Paste",
   command=self.__paste)
      # To give a feature of editing
      self.__thisMenuBar.add_cascade(label="Edit", menu=self.__thisEditMenu)
      # To create a feature of description of the notepad
      self.__thisHelpMenu.add_command(label="About Notepad",
   command=self.__showAbout)
      self.__thisCommandMenu.add_command(label = "About Commands", command=self.__showCommand)
      self.__thisMenuBar.add_cascade(label="Commands", menu=self.__thisCommandMenu)
      self.__thisMenuBar.add_cascade(label="Help", menu=self.__thisHelpMenu)
      self.__root.config(menu=self.__thisMenuBar)
      self.__thisScrollBar.pack(side=RIGHT,fill=Y)
      # Scrollbar will adjust automatically according to the content
      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("About Notepad","Simple text editor like notepad using Python")
   def __showCommand(self):
      showinfo("Notepad", "Just Another TextPad \n Copyright \n with BSD license you can use it'")
   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:
         # Save as new file
         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 main application
      self.__root.mainloop()
# Run main application
notepad = Notepad(width=600,height=400)
notepad.run()