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time_app.py
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time_app.py
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#!/usr/bin/env python3
#
# Copyright 2014 Paul Donohue <[email protected]>
#
# This program is free software: you can redistribute it and/or modify it under the terms of the GNU
# General Public License as published by the Free Software Foundation, either version 3 of the
# License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
# even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License along with this program. If
# not, see <http://www.gnu.org/licenses/>.
#
#
# Prerequisites:
# Install GtkTrayIcon (from the gtktrayicon/ subdirectory)
# sudo apt-get install --no-install-recommends libgirepository1.0-dev gobject-introspection \
# gir1.2-gtk-3.0
#
# Use `None` for a transparent background.
# In Ubuntu 18.04 (trayer 1.1.7, gtk 3.22.30), transparency worked fine. However, in Ubuntu 20.04
# (trayer 1.1.8, gtk 3.24.20), transparency does not work. Specifically, the visual area of the
# icon is never cleared, so at startup any existing icon that was moved to make space for the new
# icon will remain visible in the new icon's background, and any updates to the icon text will draw
# over the previous text. I'm not sure what is causing it, but a simple fix is to set a background
# color instead of using a transparent background.
#background_color = None
background_color = '#9A9A9A'
import gi
gi.require_version('Gtkti', '3.0')
from gi.repository import Gtkti, Gtk, Gdk, GLib
import signal, sys, os
import threading
import datetime
# In Python 2, threading.Event().wait() wakes up frequently and burns a lot of CPU.
# This does not happen in Python 3, so I'm simply using Python 3 instead of Python 2 for this app.
# See: http://stackoverflow.com/questions/29082268/python-time-sleep-vs-event-wait
# I don't know if there are any work-arounds for this issue in Python 2.
# WARNING: Variable scope for Python inline functions and lambdas does not work like other
# languages! To ensure that definition-scope variables are passed into the function/lambda's scope
# as expected, explicitly add 'var=var' (optional/defaulted) parameters to the end of the function/
# lambda's parameter list.
class TimeApp:
def __init__(self):
self.show_date = True
self.prefix = ''
#self.date_format = '%x ' # Locale-appropriate date format
self.date_format = '%Y.%m.%d '
self.time_format = '%H:%M'
self.show_seconds = False
self.seconds_format = ':%S'
self.suffix = ' '
self.time_fudge = datetime.timedelta(seconds=.25)
self.build_ui()
self.gtk_update_ui()
self.start_update_thread()
def build_ui(self):
self.tray = tray = Gtkti.TrayIcon()
eventbox = Gtk.EventBox()
if background_color:
css = Gtk.CssProvider()
css.load_from_data(('* { background-color: '+background_color+'; }').encode())
Gtk.StyleContext.add_provider_for_screen(Gdk.Screen.get_default(), css, Gtk.STYLE_PROVIDER_PRIORITY_APPLICATION)
tray.add(eventbox)
self.tray_label = tray_label = Gtk.Label(label=self.prefix+self.suffix)
eventbox.add(tray_label)
tray.show_all()
menu = Gtk.Menu()
item_show_date = Gtk.CheckMenuItem(label='Show Date')
item_show_date.set_active(self.show_date)
def toggle_date(item_show_date, self=self):
self.show_date = item_show_date.get_active()
self.gtk_update_ui()
item_show_date.connect('toggled', toggle_date)
menu.append(item_show_date)
item_show_seconds = Gtk.CheckMenuItem(label='Show Seconds')
item_show_seconds.set_active(self.show_seconds)
self.toggle_seconds_event = threading.Event()
def toggle_seconds(item_show_seconds, self=self):
self.show_seconds = item_show_seconds.get_active()
# Wake the update thread, which will update the UI, then sleep again
self.toggle_seconds_event.set()
item_show_seconds.connect('toggled', toggle_seconds)
menu.append(item_show_seconds)
item_quit = Gtk.MenuItem(label='Quit')
def quit(menu_item):
if sys.version_info < (3, 0):
os.kill(os.getpid(), signal.SIGINT)
else:
Gtk.main_quit()
item_quit.connect('activate', quit)
menu.append(item_quit)
menu.show_all()
def button_pressed(eventbox, event, menu=menu):
if event.type == Gdk.EventType.BUTTON_PRESS and event.button == 3:
menu.popup(None, None, None, None, event.button, event.time)
eventbox.connect('button-press-event', button_pressed)
# Update the UI (thread-safe)
def update_ui(self):
GLib.idle_add(self.gtk_update_ui)
# Update the UI (within the GTK main thread ; not thread-safe)
def gtk_update_ui(self):
fmt = self.prefix
if self.show_date: fmt += self.date_format
fmt += self.time_format
if self.show_seconds: fmt += self.seconds_format
fmt += self.suffix
# Update events should fire as close as possible to the second or minute boundary, but if they
# fire early, the previous time will incorrectly be displayed until the next update. Fudge the
# time to make sure the display is incremented even if the event fires slightly early.
now = datetime.datetime.now() + self.time_fudge
self.tray_label.set_text(now.strftime(fmt))
# Return false to unregister this method as a GLib idle handler
return False
def start_update_thread(self):
def run_in_thread(self=self):
while True:
fired_update = datetime.datetime.utcnow()
self.update_ui()
now = datetime.datetime.utcnow()
if self.show_seconds:
time_to_next_update = 1 - now.microsecond/1000000.0
if (1000000.0 - fired_update.microsecond) < self.time_fudge.microseconds:
time_to_next_update += 1
else:
time_to_next_update = 60 - now.second - now.microsecond/1000000.0
if time_to_next_update < 1 and (1000000.0 - fired_update.microsecond) < self.time_fudge.microseconds:
time_to_next_update += 60
self.toggle_seconds_event.wait(time_to_next_update) ; self.toggle_seconds_event.clear()
thread = threading.Thread(target=run_in_thread)
thread.daemon = True
thread.start()
if __name__ == '__main__':
TimeApp()
def on_sigint(_signum, _frame):
Gtk.main_quit()
signal.signal(signal.SIGINT, on_sigint)
# If the main thread is running C code (such as Gtk.main()), then Python signal handlers will not
# run until that C code returns. To work around this, run the C code in a separate thread, then
# sleep the main thread. Unfortunately, threading.Thread().join() and threading.Event().wait() in
# Python 2.X (but not 3.X) also block signal handlers (see http://bugs.python.org/issue1167930).
# To work around this, sleep the main thread using signal.pause(), and wake it from the 'Quit'
# menu item above using `os.kill(os.getpid(), signal.SIGINT)`.
thread = threading.Thread(target=Gtk.main)
thread.start()
if sys.version_info < (3, 0):
signal.pause()
thread.join()