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robrene

Member

Registered: 2009-04-16

Posts: 168

(solved) [python] Update status-icon

Hey all, I wrote a little python app to scartch an itch I had, namely having an icon somewhere that uses my gtk icon theme and that allows me to change the volume. I managed to do this, but now I want to add one more (important) piece of functionality. As of now, I call update_status_icon() whenever some sort of event is triggered in my application that changes the volume, so that the icon is set according to the current volume level. However, I would like it to also change the icon if I change the volume using the volume buttons on my laptop or using alsamixer directly. How can I make my application 'watch' over the current volume and update the icon when it changes?

Here is my sourcecode:

#!/usr/bin/env python
# -*- coding: utf-8 -*-

import alsaaudio as alsa
import gtk
import threading


######################
## VOLUME FUNCTIONS ##
######################

def get_master_volume():

    return alsa.Mixer("Master").getvolume()[0]

def is_master_mute():

    if alsa.Mixer("Master").getmute()[0] == 1:
        return True
    return False


def set_master_volume(value):

    if value > 100:
        value = 100
    elif value < 0:
        value = 0
    alsa.Mixer("Master").setvolume(value)

def toggle_master_mute():

    if is_master_mute():
        alsa.Mixer("Master").setmute(0)
    else:
        alsa.Mixer("Master").setmute(1)


################
## GTK APPLET ##
################

class VolumeApp:

    def __init__(self):

        self.statusicon = gtk.StatusIcon()

        self.statusicon.connect("button_press_event", self.cb_button)
        self.statusicon.connect("scroll_event",       self.cb_scroll)

        self.updater = threading.Timer(0.1, self.update).start()

        self.update()

    def cb_button(self, param, data=None):

        toggle_master_mute()
        self.update()

    def cb_scroll(self, param, data=None):

        if data.direction == gtk.gdk.SCROLL_UP:
            set_master_volume(get_master_volume() + 4)
        elif data.direction == gtk.gdk.SCROLL_DOWN:
            set_master_volume(get_master_volume() - 4)

        self.update()

    def get_icon_name(self):

        if is_master_mute() == True:
            return "audio-volume-muted"

        value = get_master_volume()
        if 66 < value <= 100:
            return "audio-volume-high"
        if 33 < value <= 66:
            return "audio-volume-medium"
        if 0 < value <= 33:
            return "audio-volume-low"
        if value == 0:
            return "audio-volume-muted"

        return "error"

    def update(self):

        self.statusicon.set_from_icon_name(self.get_icon_name())
        self.statusicon.set_tooltip(str(get_master_volume()))

    def main(self):

        self.statusicon.set_visible(True)
        gtk.main()


##################
## MAIN PROGRAM ##
##################

if __name__ == "__main__":

    app = VolumeApp()
    app.main()

Last edited by robrene (2010-01-17 18:54:30)

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robrene

Member

Registered: 2009-04-16

Posts: 168

Re: (solved) [python] Update status-icon

Update:

I am now trying to get the application to run update() at a specified interval through a seperate thread. However, I'm not familiar with python threads. Could someone please tell me why this isn't working? I posted the edited source code in my original post

Last edited by robrene (2010-01-17 15:50:31)

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Eratosthenes

Member

Registered: 2009-11-02

Posts: 19

Re: (solved) [python] Update status-icon

Update:

I am now trying to get the application to run update() at a specified interval through a seperate thread. However, I'm not familiar with python threads. Could someone please tell me why this isn't working? I posted the edited source code in my original post

I think you need one of these:

gobject.threads_init()

also take a look at the section of the gtk faq on threads http://faq.pygtk.org/index.py?req=show& … 20.001.htp

robrene

Member

Registered: 2009-04-16

Posts: 168

Re: (solved) [python] Update status-icon

That one silly line of code solved everything! Thanks! I've been looking for a solution for this problem all day now.

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