How To Create A Text Editor Such as Notepad with Python

How To Create A Text Editor Such as Notepad with Python

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 = 500

    __thisHeight = 500

    __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

        # Set window size (the default is 300x300)

        try:

            self.__thisWidth = kwargs['width']

        except KeyError:

            pass

        try:

            self.__thisHeight = kwargs['height']

        except KeyError:

            pass

        # Set 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.__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("Notepad", "This is a simple Notepad editor created with Python with Tkinter. This editor can create new file, edit file ,cut,copy and paste features will be available ")

    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()

notepad = Notepad(width=800,height=500)

notepad.run()