text editor inc darkmode

from guizero import*

app = App(title="texteditor")

font_tools = Window(app, visible = False)
align_window = Window(app, visible = False)


# A new function that closes the app
def exit_app():
    app.info("Alert!", "Have you saved your work")
    app.destroy()

# save as function
def save_as():
    name = app.question("Save as...", "What would you like to call your file?")
    # If cancel is pressed, None is returned
    # so check a name of file was entered
    if name is not None:
        file_name.value = name
    with open(file_name.value, "w") as f:
        f.write(editor.value)

# 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)
    #disable the save button
        save_button.disable()

# enabling buttons
def enable_save():
	save_button.enable()
	save_as_button.enable()

#change font function
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")

#change colour function
def change_color(value):
   editor.text_color = lb_color.value

#controls visable/invisable
def controls_visible_toggle():
    if controls_ckb.value == True:
        file_controls.show()
    else:
        file_controls.hide()

def show():
    file_controls.visible = True

#show new font options in menu bar
def show_font_tools():
    change_font.value = font.value
    size.value = size.value
    change_color.value = lb_color.value
    font_tools.show(wait = True)

def change_alignment():
    if bgp_alignment.value == "right":
        right = Text(app, editor, align = "right")
    elif bgp_alignment.value == "left":
        text.align = "left"
    elif bgp_alignment.value == "top":
        editor.align = "top"
    elif bgp_alignment.value == "bottom":
        editor.align = "bottom"

    align_window.hide()
    save_as_button.enable()

def show_align_window():
    align_window.show(wait = True)

def darkmode():
    editor.darkmode = darkmode_button.value
    editor.bg = "black"
    editor.text_color = "white"
    editor.tk.config(insertbackground = "White")

def lightmode():
    editor.lightmode = lightmode_button.value
    editor.tk.config(insertbackground = "black")
    editor.bg = "white"
    editor.text_color = "black"




def clear_text():
    editor.value = ""


def commit_tools_window():
    editor.change_font = font.value
    editor.change_text_size = size.value
    editor.change_color = lb_color.value
    editor.resize(1, 1)
    editor.resize("fill", "fill")
    save_button.enable()
    font_tools.hide()


def get_help():
    app.info("Help!", "PLease use this link: https://lawsie.github.io/guizero/ ")

# The new MenuBar
menubar = MenuBar(app,
                  toplevel=["File", "Edit", "Show", "Help"],
                  options=[
                      [["Open",open_file],
                       ["Save",save_file],
                       ["Save as", save_as],
                       ["Exit",exit_app]],
                      [["Format", show_font_tools],
                       ["Align", show_align_window]],
                      [["Show",show],
                       ["dark", darkmode],
                       ["light", lightmode]],
                      [["Help", get_help]]
                      ])


file_controls = Box(app, align="top", width="fill", border=True)
file_name = TextBox(file_controls, text="text_file.txt", width = 25, align="left")
#preferences_controls = Box(app, align="top", height = 50, width = "fill", border=True)
#controls visable toggle
controls_ckb = CheckBox(file_controls, text="Show controls", align = "right", command = controls_visible_toggle)

save_button = PushButton(file_controls, text="Save", command = save_file, align="right")
open_button = PushButton(file_controls, text="Open", command = open_file, align="right")
save_as_button  = PushButton(file_controls, text="Save as", command = save_as, align="right")
change_align_button = PushButton(align_window, text = "change alignment", command = change_alignment)
editor = TextBox(app, multiline = True, height = "fill", width = "fill", command = enable_save)
darkmode_button = PushButton(app, text = "Darkmode", command = darkmode, align="right")
lightmode_button = PushButton(app, text ="lightmode", command = lightmode, align="right")


#font drop-down
fontchosen = TextBox (font_tools, text = "Choose Font", width = 20, align = "top")
font = Combo(font_tools, options=["courier", "times new roman", "verdana", "comic sans", "calibra", "Arial Black" ], width = 25, align="left", command = change_font)

#slider to control font size
size = Slider(font_tools,  align="left", command=change_text_size, start=8, end=22)

#change colour listbox
lb_color = ListBox(
    font_tools,
    items = ["red", "green", "blue", "yellow", "purple", "turquoise", "pink", "orange", "black", "brown", "cyan"],
    selected = "black",
    align = "right",
    command = change_color,
    scrollbar = True)

#alignment tab
message1 = Text(align_window, text = "Which alignment would you like?")
bgp_alignment = ButtonGroup(align_window, options =["Top", "Bottom", "Left", "Right"], selected="none")

clear_button = PushButton(file_controls, text = "Clear Text",  align="left", command = clear_text, enabled = True)
tools_btn_done = PushButton(font_tools, align = "bottom", text="Done", command = commit_tools_window)
save_button.disable()

app.display()