t#!/usr/bin/env python3
# FutureLearn course: Programming with GUIs
# URL: https://www.futurelearn.com/courses/programming-with-guis
#
# Tested with
# Python 3.8.0 on Windows 10 (mainly)
# Python 3.7.3 on Raspbian 10.2
#
# Known bug on Raspbian with Python 3.7.3
# (works under Windows 10 with Python 3.8.0):
# Start the app, click Help/About and than exit the app.
# After closing the info box the app thinks, there is unsaved text
# in the editor.
# I have the same effect also in some other situations on Raspbian 10.2
# and not on Windows 10
# IMHO: this seems to be a problem in the underlying TK implementation.
from guizero import App, Box, Combo, MenuBar, Slider, Text, TextBox
from pathlib import Path
import os
import sys
app_name = 'Simple Text Editor'
app_version = '5'
app_verdate = '13-DEC-2019'
app_version_string = app_name + ' v' + app_version + ' (' + app_verdate + ')'
app = App(title=app_name, bg='slategray', width=800, height=600)
# remember the last folder in use, default: . - the current folder
folder = '.'
# True: no unsaved text in the editor
text_saved = True
# True: dark mode is enabled
dark_mode = False
# get the current folder ins use from the complete file path, stored in file_name_text_box.value
def get_folder():
global file_name_text_box
name = file_name_text_box.value
if name is None:
return '.'
elif len(name) == 0:
return '.'
else:
return Path(name).parent
# show some version information
def about_editor():
global app_version_string
app.info('About', app_version_string + "\nA simple Python guizero based text editor")
return
# open a file at startup of the editor
# store the file name in file_name_text_box.value
def open_file_at_startup(file_name):
global text_saved
global editor
global file_name_text_box
try:
with open(file_name, "r") as f:
editor.value = f.read()
except Exception as e:
print('Error in reading file:', e)
return
file_name_text_box.value = file_name
text_saved = True
# open a file, selected in a file selector box, in the editor and
# store the file name in file_name_text_box.value
def open_file():
global text_saved
global app
global editor
global file_name_text_box
if not text_saved:
resp = app.yesno('Warning', 'You have unsaved text in the editor - proceed?')
if not resp:
return
f = get_folder()
name = app.select_file('Open file', folder=f, filetypes=[["Text files", "*.txt"], ["Markdown files", "*.md"]], save=False)
if name is None:
text_saved = True
return
if len(name) == 0:
text_saved = True
return
try:
with open(name, "r") as f:
editor.value = f.read()
except Exception as e:
app.error('Read Error', 'Error in reading file: ' + str(e))
return
file_name_text_box.value = name
text_saved = True
# save the text in the editor the the file name, stored in file_name_text_box.value
def save_file():
global text_saved
global file_name_text_box
name = file_name_text_box.value
if name is None:
save_as_file()
return
if len(name) == 0:
save_as_file()
return
try:
with open(name, "w") as f:
f.write(editor.value)
except Exception as e:
app.error('Write Error', 'Error in reading file: ' + str(e))
return
text_saved = True
# save the text in the editor into a file, selected in a file selector box and
# store the name in file_name_text_box.value
def save_as_file():
global text_saved
global app
global file_name_text_box
f = get_folder()
name = app.select_file('Save file', folder=f, filetypes=[["Text files", "*.txt"], ["Markdown files", "*.md"]], save=True)
if name is None:
return
if len(name) == 0:
return
try:
with open(name, "w") as f:
f.write(editor.value)
except Exception as e:
app.error('Write Error', 'Error in reading file: ' + str(e))
return
file_name_text_box.value = name
text_saved = True
# remove all text from the editor and set the file name to '' in file_name_text_box.value
def new_file():
global text_saved
global app
global file_name_text_box
global editor
global char_count_text_box
if not text_saved:
resp = app.yesno('Warning', 'You have unsaved text in the editor - proceed?')
if not resp:
return
file_name_text_box.value = ''
editor.value = ''
char_count_text_box.value = '0'
text_saved = True
# close the editor app
def exit_app():
global text_saved
global app
if not text_saved:
resp = app.yesno('Warning', 'You have unsaved text in the editor - proceed?')
if not resp:
return
app.destroy()
def change_font():
global editor
global font
editor.font = font.value
def change_text_color():
global editor
global text_color
editor.text_color = text_color.value
def change_text_size():
global editor
global size
editor.text_size = size.value
editor.resize(1, 1)
editor.resize("fill", "fill")
# get number of characters in the editor
# observation: even if editor.value is '' the len(editor.value) is 1
def get_number_of_text_chars():
global editor
chars = len(editor.value)
if chars > 0:
return chars -1
else:
return 0
# wil be called by any change in the editor's text area
def count_text_chars():
global text_saved
global char_count_text_box
char_count_text_box.value = get_number_of_text_chars()
text_saved = False
def toggle_status_line():
global status_box
if status_box.visible:
status_box.visible = False
else:
status_box.visible = True
def toggle_char_count():
global char_count_box
if char_count_box.visible:
char_count_box.visible = False
else:
char_count_box.visible = True
def toggle_preferences_controls():
global preferences_controls
if preferences_controls.visible:
preferences_controls.visible = False
else:
preferences_controls.visible = True
def toggle_dark_mode():
global dark_mode
global editor
global text_color
if dark_mode:
dark_mode = False
editor.bg = 'white'
editor.text_color = text_color.value
text_color.visible = True
else:
dark_mode = True
editor.bg = '#0f0f0f'
editor.text_color = 'white'
text_color.visible = False
# same handling as if clicked o 'File/Exit'
app.when_closed = exit_app
# create the app's menu bar and the related menu items
menubar = MenuBar(app,
# menu bar
toplevel=["File", "Options", "Help"],
# menu items
options=[
# File
[
# items in File
["New", new_file],
["Open...", open_file],
["Save", save_file],
["Save as...", save_as_file],
["Exit", exit_app]
],
# Options
[
# items in Options
["Toggle status line", toggle_status_line],
["Toggle char count", toggle_char_count],
["Toggle preferences", toggle_preferences_controls],
["Toggle dark mode", toggle_dark_mode]
],
# Help
[
# items in Help
["About", about_editor]
]
])
# create the status line, copntains: file name and character count
status_box = Box(app, width='fill', border=True)
file_name_label = Text(status_box, text='File: ', align="left")
file_name_text_box = TextBox(status_box, text='', width='fill', align="left", enabled=False)
file_name_text_box.bg = 'white'
char_count_box = Box(status_box, width='fill', border=True)
char_count_text_box = TextBox(char_count_box, text='', width='20', align="right", enabled=False)
char_count_label = Text(char_count_box, text='Chars: ', align="right")
char_count_text_box.value = '0'
text_saved = True
# create the preferences line
preferences_controls = Box(app, align="top", width="fill", border=True)
font = Combo(preferences_controls, options=["Courier", "Times New Roman", "Verdana"], align="left", selected='Courier', command=change_font)
size = Slider(preferences_controls, align="left", command=change_text_size, start=10, end=18)
size.value = 10
text_color = Combo(preferences_controls, options=['black', 'blue', 'red', 'magenta'], align="left", selected='black', command=change_text_color)
# create the editor
editor = TextBox(app, multiline=True, height="fill", width="fill", text='', scrollbar=True)
editor.bg = 'white'
editor.font = font.value
editor.text_size = size.value
editor.text_color = text_color.value
editor.update_command(count_text_chars)
editor.focus()
if len(sys.argv) > 1:
# argument available, assumption: this is the name of an existing file
# read file into editor before displaying the GUI
open_file_at_startup(os.path.realpath(sys.argv[1]))
app.display()
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