13_text_editor_challenge.py

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

# function for reading files
def open_file():
    if (lbl_needSave.visible):
        answer = yesno("Warning!!!","The editor has unsaved changes; open the other file anyway?")
        if (answer):
            open_file_confirmed()
    else:
        open_file_confirmed()

def open_file_confirmed():
    with open(file_name.value, "r") as f:
        editor.value = f.read()
    # Disable the save_button
    save_button.disable()
    #save_button.hide()
    lbl_needSave.visible = False

# 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()
    #save_button.hide()
    lbl_needSave.visible = False

# A new function that closes the app
def exit_app():
    if (lbl_needSave.visible):
        answer = yesno("Warning!!!","The editor has unsaved changes; exit anyway?")
        if (answer):
            exit_app_confirmed()
    else:
        exit_app_confirmed()

def exit_app_confirmed():
    app.destroy()

def enable_save():
    save_button.enable()
    #save_button.show()
    lbl_needSave.visible = True

def change_font():
    print(editor.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")

def change_text_color():
    editor.text_color = text_col.value

def change_bg_color(col):
    editor.bg = col

def toggle_mode():
    app.bg = "black" if checkbox_mode.value == 1 else "light grey"
    app.text_color = "white" if checkbox_mode.value == 1 else "black"
    text_col.value = app.text_color

app = App(title="texteditor")

# The new MenuBar
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')]]
                      ])

# 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="10_text_file.txt", width=50, align="left")

# label that contains an asterisk, used to show wheter the save is needed or not
lbl_needSave = Text(file_controls, text="*", size=16, align="left", visible=False)

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

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

preferences_controls = Box(app, align="bottom", width="fill", border=True)
font = Combo(preferences_controls, options=["courier new", "times new roman", "verdana"], align="left", command=change_font)
size = Slider(preferences_controls,  align="left", command=change_text_size, start=10, end=60)
text_col = Combo(preferences_controls, options=["black", "blue", "green", "gray", "magenta", "white"], align="left", command=change_text_color)
checkbox_mode = CheckBox(preferences_controls, text="Dark mode", align="right", command=toggle_mode)

app.display()