Question

Write a GUI-based program that allows the user to open, edit, and save text files. The GUI should include a labeled entry field for the filename and multi-line text widget for the text of the file. The user should be able to scroll through the text by manipulating a vertical scrollbar. Include command buttons labeled Open, Save, and New that allow the user to open, save and create new files. The New command should then clear the text widget and the entry widget. Python

• .txt file
• .py file
• Psuedocode AND Flowchart (use Word or PowerPoint only)

Answer 1

Importing Tkinter :

filter_none

edit

play_arrow

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import tkinter import os from tkinter import * # To get the space above for message from tkinter.messagebox import * # To get the dialog box to open when required from tkinter.filedialog import *

Adding Menu :

# 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() # To terminate 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)

With this code we will add the menu in the windows of our notepad and will add the things like copy, paste, save etc, to it.

Adding The Functionality :

def __quitApplication(self):     self.__root.destroy()     # exit() def __showAbout(self):     showinfo("Notepad", "Mrinal Verma") 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>>")

In this we have added all the functionality that is required in the notepad, you can add other functionality too in this like the font size, font color, bold, underlined, etc.

Main Code After Merging All :

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 = 300     __thisHeight = 300     __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","Mrinal Verma")     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()

To run this code, save it by the extension .py and then open cmd(command prompt) and move to the location of the file saved and then write the following

python "filename".py 

and press enter and it will run. Or can be run directly by simply double clicking your .py extension file