mynewtexteditor

from guizero import App, TextBox, PushButton, Box, Combo, Slider, CheckBox

app = App(title="My Text Editor")

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

# functioning for saving files
def save_file():
    with open(file_name.value, "w") as f:
        f.write(editor.value)

# create a preference new font, size and colour of the text, dark theme
def change_font():
    editor.font = font.value

def change_text_size():
    editor.text_size = size.value
    editor.resize(1, 1)
    editor.resize("fill", "fill")

def change_colour():
    editor.text_color = colour.value

def change_theme():
    if dark_mode.value == 1:
        app.bg = "black"
        app.text_color = "white"
    else:
        app.bg = None
        app.text_color = None


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

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

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

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

# create a TextBox which is not in the box and fills the rest of the GUI
editor = TextBox(app, multiline=True, height="fill", width="fill", command=change_colour)

# create a box that consist controling the text and theme
preferences_control = Box(app, layout='auto', align="bottom", width="fill")
font = Combo(preferences_control,options=["verdana","arial","times new roman"], align="left", command=change_font)
colour = Combo(preferences_control, options=["red","green","black"], align="left", command=change_colour)
size = Slider(preferences_control,start=8, end=16, align="left", command=change_text_size)
dark_mode = CheckBox(preferences_control, text="dark", align="left", command=change_theme)

app.display()