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

def open_file():
    with open(file_name.value, "r") as f:
        editor.value = f.read()

def save_file():
    with open(file_name.value, "w") as f:
        f.write(editor.value)
    save_button.hide()

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_text_color():
    editor.text_color = color.value

def enable_save():
    save_button.show()

def exit_app():
    app.destroy()

def change_bg_color(col):
    editor.bg = col

app = App(title="Text Editor 2")

menubar = MenuBar(app,
                  toplevel=["File", "Background color"],
                  options=[
                      [["open",open_file], ["save",save_file], ["exit",exit_app]],
                      [["red",lambda: change_bg_color('red')], ["blue",lambda: change_bg_color('blue')], ["cyan",lambda: change_bg_color('cyan')], ["magenta",lambda: change_bg_color('magenta')], ["light green",lambda: change_bg_color('light green')]]
                      ])

file_controls = Box(app, align="top", width="fill")
file_name = TextBox(file_controls, text="text_file.txt", width=50, align="left")
save_button = PushButton(file_controls, text="Save", command=save_file,  align="right")
open_button = PushButton(file_controls, text="Open", command=open_file,  align="right")

preferences_controls = Box(app, width="fill", border=True)
font = Combo(preferences_controls, options=["courier", "times new roman", "verdana"], align="left", command=change_font)
size = Slider(preferences_controls,  align="left", start = 8, end = 42, command=change_text_size)
color = Combo(preferences_controls, options=["black", "red", "cyan", "blue", "green", "magenta", "orange"], command=change_text_color)
editor = TextBox(app, multiline=True, height="fill", width="fill", command=enable_save)

app.display()