Texteditor-GUI-text_preferences

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

app = App(title="text editor")

# 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():
    with open(file_name.value, "w") as f:
        f.write(editor.value)

# function for changing font style
def change_font():
    editor.font = font.value

#function for changing text size
def change_text_size():
    editor.text_size = size.value
    #reset box size to adjust to new text size
    editor.resize(1,1)
    editor.resize("fill", "fill")

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

# 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", border = True)

#Create a new box to house text preferences
text_preferences = Box(app, align = "top", width = "fill", border = True)
font = Combo(text_preferences, align = "left", options = ["courier", "helvetica", "times new roman", "verdana"], command = change_font)
size = Slider(text_preferences, align = "left", command = change_text_size, start = 10, end = 24)
colour = Combo(text_preferences, align = "left", command = change_color, options = ["black", "red", "blue", "green"])

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

# 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",  align="right", command = save_file)

# 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")

app.display()