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volume_app.py
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volume_app.py
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#!/usr/bin/env python3
#
# Copyright 2016 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
# git clone https://github.com/larsimmisch/pyalsaaudio.git
# cd pyalsaaudio ; python3 setup.py build ; sudo python3 setup.py install
# (See https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=613091 )
#
# TODO: Switch to https://pypi.org/project/pulsectl/
# 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 alsaaudio # See /usr/share/doc/python-alsaaudio/examples/mixertest.py
import select
# 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 VolumeApp:
def __init__(self):
self.prefix = 'V:'
self.suffix = ' '
alsa_device = 'default'
alsa_control = 'Master'
self.alsa_ctl = alsaaudio.Mixer(control=alsa_control, device=alsa_device)
self.scroll_step = 4 # Amount to change volume for each scroll event
self.build_ui()
self.gtk_update_ui()
self.start_monitor_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_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 show_menu(event, menu=menu):
menu.popup(None, None, None, None, event.button, event.time)
window = Gtk.Window(type=Gtk.WindowType.POPUP)
box = Gtk.VBox()
window.add(box)
slider = Gtk.VScale()
slider.set_size_request(0,200)
slider.set_range(0,100)
slider.set_inverted(True)
slider.set_draw_value(False)
def slider_changed(slider):
self.alsa_ctl.setvolume(int(slider.get_value()))
self.gtk_update_ui(True)
slider.connect('value-changed', slider_changed)
box.add(slider)
button = Gtk.Button.new_with_label('M')
def button_clicked(button):
if self.alsa_ctl.getmute()[0]:
self.alsa_ctl.setmute(0)
button.set_label('m')
else:
self.alsa_ctl.setmute(1)
button.set_label('M')
self.gtk_update_ui(True)
button.connect('clicked', button_clicked)
box.add(button)
self.window_visible = False
def update_window(self=self, slider=slider, button=button):
if self.window_visible:
slider.set_value(self.alsa_ctl.getvolume()[0])
if self.alsa_ctl.getmute()[0]:
button.set_label('M')
else:
button.set_label('m')
self.update_window = update_window
# Need to render the window briefly so that window.get_size() will be accurate
window.show_all()
window.hide()
def toggle_window(self=self, window=window):
if self.window_visible:
window.hide()
self.window_visible = False
else:
tray_window = self.tray.get_window()
tray_pos = tray_window.get_origin()
tray_x = tray_pos[1]
tray_y = tray_pos[2]
tray_monitor = tray_window.get_display().get_monitor_at_window(tray_window)
screen_height = tray_monitor.get_geometry().height
if tray_y < (screen_height / 2):
# Put window below tray
tray_height = self.tray.get_size()[1]
window.move(tray_x, tray_y+tray_height)
else:
# Put window above tray
window_height = window.get_size()[1]
window.move(tray_x, tray_y-window_height)
self.window_visible = True
self.update_window()
window.show_all()
def button_pressed(eventbox, event, show_menu=show_menu, toggle_window=toggle_window):
if event.type == Gdk.EventType.BUTTON_PRESS and event.button == 3:
show_menu(event)
elif event.type == Gdk.EventType.BUTTON_PRESS and event.button == 1:
toggle_window()
eventbox.connect('button-press-event', button_pressed)
def scrolled(eventbox, event):
if event.direction == Gdk.ScrollDirection.UP:
if self.alsa_ctl.getmute()[0]:
self.alsa_ctl.setmute(0)
self.alsa_ctl.setvolume(self.scroll_step)
else:
cur_vol = self.alsa_ctl.getvolume()[0]
if cur_vol > (100-self.scroll_step):
self.alsa_ctl.setvolume(100)
else:
self.alsa_ctl.setvolume(cur_vol+self.scroll_step)
elif event.direction == Gdk.ScrollDirection.DOWN:
cur_vol = self.alsa_ctl.getvolume()[0]
if cur_vol < self.scroll_step:
self.alsa_ctl.setvolume(0)
self.alsa_ctl.setmute(1)
else:
self.alsa_ctl.setvolume(cur_vol-self.scroll_step)
self.gtk_update_ui()
eventbox.connect('scroll-event', scrolled)
# Update the UI (thread-safe)
def update_ui(self, window_changed=False):
GLib.idle_add(self.gtk_update_ui, window_changed)
# Update the UI (within the GTK main thread ; not thread-safe)
def gtk_update_ui(self, window_changed=False):
if self.alsa_ctl.getmute()[0] == 1:
self.tray_label.set_text(self.prefix+'M'+self.suffix)
else:
volume = self.alsa_ctl.getvolume()[0]
self.tray_label.set_text(self.prefix+str(volume)+self.suffix)
if not window_changed:
self.update_window()
# Return false to unregister this method as a GLib idle handler
return False
def start_monitor_thread(self):
def run_in_thread(self=self):
alsa_poll = select.poll()
alsa_poll.register(*(self.alsa_ctl.polldescriptors()[0]))
while True:
# Wait for an event
# We don't get events when we make changes,
# only when other processes make changes
alsa_poll.poll()
self.alsa_ctl.handleevents()
self.update_ui()
thread = threading.Thread(target=run_in_thread)
thread.daemon = True
thread.start()
if __name__ == '__main__':
VolumeApp()
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()