git.maemo.org Git - gigfinder/blob - src/opt/gigfinder/locator.py

   1 import gobject
   2 import location
   3
   4 class LocationUpdater:
   5
   6     def __init__(self):
   7         self.lat = None
   8         self.long = None
   9         self.loop = gobject.MainLoop()
  10
  11         self.control = location.GPSDControl.get_default()
  12         self.control.set_properties(preferred_method=location\
  13                                             .METHOD_USER_SELECTED,
  14                                     preferred_interval=location\
  15                                             .INTERVAL_DEFAULT)
  16         self.control.connect("error-verbose", self.on_error, self.loop)
  17         self.control.connect("gpsd-stopped", self.on_stop, self.loop)
  18
  19         self.device = location.GPSDevice()
  20         self.device.connect("changed", self.on_changed, self.control)
  21
  22     def update_location(self):
  23         """ Run the loop and update lat and long """
  24         self.reset()
  25         gobject.idle_add(self.start_location, self.control)
  26         self.loop.run()
  27
  28     def on_error(self, control, error, data):
  29         """ Handle errors """
  30         print "location error: %d... quitting" % error
  31         data.quit()
  32
  33     def on_changed(self, device, data):
  34         """ Set long and lat """
  35         if not device:
  36             return
  37         if device.fix:
  38             # once fix is found and horizontal accuracy is 1km
  39             if location.GPS_DEVICE_LATLONG_SET:
  40                 if device.fix[6] <= 100000:
  41                     self.lat, self.long = device.fix[4:6]
  42                     data.stop()
  43
  44     def on_stop(self, control, data):
  45         """ Stop the location service """
  46         data.quit()
  47
  48     def start_location(self, data):
  49         """ Start the location service """
  50         data.start()
  51         return False
  52
  53     def reset(self):
  54         """ Reset coordinates """
  55         self.lat = None
  56         self.long = None
  57         self.device.reset_last_known()
  58