maemo.org - Talk - Control the media player with the cam focus button (multiple "gestures")

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- - Control the media player with the cam focus button (multiple "gestures") (https://talk.maemo.org/showthread.php?t=54695)

Control the media player with the cam focus button (multiple "gestures")

Here's a small Python script that monitors the cam focus button state and allows you to navigate through your music and play/pause it. Simply start it and then you can two-press to go to the next song, three-press to go to the previous song or four-press to toggle play/pause. The last press must be held until the action is carried out. This avoids accidental presses to be recognized.

Code:

# N900 focus button Media Player control

# thp 2010-05-31

#

# The last press must be held for about 1 second,

# so for a three-press, you would do short-short-long.

#

# two-press: next

# three-press: previous

# four-press: toggle pause

#



import gtk

import gobject

import dbus

import dbus.glib

import hildon



FOCUS_FILE = '/sys/devices/platform/camera_button/bus/devices/cam_focus/state'

TIMEOUT = 1000



MAFW_OBJECT = 'com.nokia.mafw.renderer.Mafw-Gst-Renderer-Plugin.gstrenderer'

MAFW_PATH = '/com/nokia/mafw/renderer/gstrenderer'

MAFW_INTF = 'com.nokia.mafw.renderer'



METHODS = [None, 'next', 'previous', 'pause']



class FocusMonitor(object):

    def __init__(self):

        self.fp = open(FOCUS_FILE, 'r')

        self.fp.read()

        self.source_id = gobject.io_add_watch(self.fp, \

                gobject.IO_PRI, \

                self.on_state_changed)

        self.timeout_id = None

        self.active = False

        self.event_count = 0

        self.session_bus = dbus.SessionBus()

        self.widget = gtk.Label()



    def on_state_changed(self, source, cb_condition):

        self.fp.seek(0, 0)

        self.active = (self.fp.read().strip() == 'active')

        if self.active:

            self.event_count += 1

            if self.timeout_id is not None:

                gobject.source_remove(self.timeout_id)

            self.timeout_id = gobject.timeout_add(TIMEOUT, self.on_timeout)

        return True



    def banner(self, message):

        hildon.hildon_banner_show_information(self.widget, '', message)



    def on_timeout(self):

        if not self.active:

            self.event_count = 0

            self.timeout_id = None

            return False



        if self.event_count > 1 and self.event_count <= len(METHODS):

            o = self.session_bus.get_object(MAFW_OBJECT, MAFW_PATH)

            i = dbus.Interface(o, MAFW_INTF)

            method_name = METHODS[self.event_count-1]

            method = getattr(i, method_name)

            try:

                method()

                self.banner(method_name)

            except Exception, e:

                if method_name == 'pause':

                    try:

                        i.play()

                        self.banner('play')

                    except:

                        pass

        self.event_count = 0

        self.timeout_id = None

        return False



FocusMonitor()

gtk.main()