gui.py

import functions
import FreeSimpleGUI as sg

label = sg.Text("Type in a To-Do")
input_box = sg.InputText(tooltip = "Enter a To-Do", key = "todo")
add_button = sg.Button("Add")
list_box = sg.Listbox(values = functions.get_todos(), key = "todos",
                      enable_events = True, size = [45, 10])
edit_button = sg.Button("Edit")

window = sg.Window("My To-Do App",
                   layout=[[label],[input_box, add_button], [list_box, edit_button]],
                   font=("Helvetica", 20))
while True:
    event, values = window.read()
    print(1, event)
    print(2, values)
    print(3, values["todos"])
    match event:
        case "Add":
            todos = functions.get_todos()
            new_todo = values["todo"] + "\n"
            todos.append(new_todo)
            functions.write_todos(todos)
            window["todos"].update(values=todos)
        case "Edit":
            todo_to_edit = values["todos"][0]
            new_todo = values["todo"]

            todos = functions.get_todos()
            index = todos.index(todo_to_edit)
            todos[index] = new_todo
            functions.write_todos(todos)
            window["todos"].update(values = todos)
        case "todos":
            window["todo"].update(value = values["todos"][0])
        case sg.WIN_CLOSED:
            break

window.close()