text_editor3

from guizero import *

app = App(title="texteditor")
# function for reading files
def open_file():
    with open(file_name.value, "r") as f:
        editor.value = f.read()

# function for writing files
def save_file():
    # Disable the save_button
    save_button.hide()
    with open(file_name.value, "w") as f:
        f.write(editor.value)


def enable_save():
	save_button.show()


def change_font():
    editor.font = font.value

def change_text_size():
    editor.text_size = size.value
    # resize the widget because if the text is made bigger, this might affect the size of the TextBox so guizero needs to know how to maintain the intended layout
    editor.resize(1, 1)
    editor.resize("fill", "fill")

def change_color ():
    editor.text_color = font_c.value

# A new function that closes the app
def exit_app():
    if save_button.visible==True:
        app.info("Warning!", "You have not saved the changes")
    else:
        app.destroy()

def undo():
    app.info("Information", "This function has not been implemented yet!")

def copy():
    app.info("Information", "This function has not been implemented yet!")

def cut():
    app.info("Information", "This function has not been implemented yet!")

def paste():
    app.info("Information", "This function has not been implemented yet!")

def find():
    app.info("Information", "This function has not been implemented yet!")

def replace():
    app.info("Information", "This function has not been implemented yet!")


def help_function():
    app.info("Information", "This function has not been implemented yet!")

def about():
    app.info("Information", "This function has not been implemented yet!")

def make_dark_mode ():
    if chk_dark.value == 1:
        app.bg="black"
        app.text_color = "white"
    else:
        app.bg="white"
        app.text_color = "black"
# new Box for font, size and color

menubar = MenuBar(app,
                  toplevel=["File","Edit","Format","Help"],
                  options=[[["open",open_file],["save",save_file],["exit",exit_app]],
                           [["Undo",undo],["Copy",copy], ["Cut",cut], ["Paste",paste], ["Find",find],["Replace",replace]],
                           [["Font",change_font]],
                           [["Help",help_function], ["About", about]]])

preferences_controls = Box(app, width="fill", border=True)

font = Combo(preferences_controls, options=["Courier", "Times new roman", "Verdana", "Calibri", "Tahoma"], align="left", command=change_font)
size = Slider(preferences_controls,  align="left", command=change_text_size, start=10, end=18)
font_c = Combo(preferences_controls, options=["Red", "Green", "Blue", "White", "Black", "Gray"], align="left", command=change_color)

# box to house the controls, we want the box to span the entire width of the app
file_controls = Box(app, align="bottom", width="fill")

# TextBox for the file name
file_name = TextBox(file_controls, text="text_file.txt", width=50, align="left")

# save button which uses the save_file function
save_button = PushButton(file_controls, text="Save", command=save_file, align="right", visible=False)

# open button which uses the open_file function
open_button = PushButton(file_controls, text="Open", command=open_file,  align="right")


# text
editor = TextBox(app, multiline=True, height="fill", width="fill", command=enable_save)

box_dark=Box(app)
chk_dark = CheckBox (box_dark, text="Dark Mode", command=make_dark_mode)

app.display()