from guizero import App, TextBox, PushButton, Box, info, Combo,Slider
from guizero import CheckBox
app = App(title="texteditor")

# 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)
    info(title="File Save",text="File " + file_name.value + " Saved")     # confirm file saved
     # Disable the save_button
    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_colour():
    editor.text_color = colour.value
def enable_save():
    save_button.show()
def open_status():  #if no filename open button disabled
    if len(file_name.value)==0:
        open_button.disable()
    else:
         open_button.enable()
# 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="text_file.txt", command=open_status,width=35, align="left")
file_name.font = "Times New Roman"
file_name.text_color = 'green'
file_name.text_size = 14
file_name.bg="white"

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

# 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)
preferences_controls.bg=(150,150,150)
font = Combo(preferences_controls, options=["courier", "helvecia", "verdana"], align="left", command=change_font)
size = Slider(preferences_controls,  align="right", start = 10, end = 40, command=change_text_size)
colour = Combo(preferences_controls, options=["black", "red", "blue","green","orange"], align="right",command=change_text_colour)

app.display()