Text Editor V6 Menus

### Text Editor V6 drop down menu 06/05/2022
from guizero import App, TextBox, PushButton, Box, Combo, Slider, Text, 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)

# A new function that closes the app
def exit_app():
    app.destroy()

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

def courier_font():
    editor.font = "courier"
def times_font():
    editor.font = "times new roman"
def verdana_font():
    editor.font = "verdana"


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")
    editor.show()

# function for changing text colour
def change_font_color():
    choice = font_color.value
    if choice == "Red":
        editor.text_color = "Red"
    if choice == "Green":
        editor.text_color = "Green"
    if choice == "Blue":
        editor.text_color = "Blue"
    if choice == "Reset":
        editor.text_color = None

app = App(title="texteditor")

menubar = MenuBar(app,
                  # These are the menu options
                  toplevel=["File", "Font"],
                  # The options are file and font style
                  options=[
                      [ ["open",open_file], ["save",save_file], ["exit",exit_app ] ],
                      [ ["courier",courier_font], ["times new roman",times_font], ["verdana",verdana_font ] ]
                  ])

# create a box to house the controls
file_controls = Box(app, align="top", width="fill", border=True)

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

# 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")

# create a box to house the controls at the bottom, add a font combobox and size slider
preferences_controls = Box(app, align="bottom", width="fill", border=True)

font = Combo(preferences_controls, options=["courier", "times new roman", "verdana"], align="left", command=change_font)
size = Slider(preferences_controls,  align="right", command=change_text_size, start=8, end=42, visible=True)
font_color = Combo(preferences_controls, options=["Red", "Green", "Blue", "Reset"], align="bottom", command=change_font_color)
text = Text(preferences_controls, text="Saved", visible=False)

app.display()