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         self.fix_count = 0
  11
  12         self.control = location.GPSDControl.get_default()
  13         self.control.set_properties(preferred_method=location\
  14                                             .METHOD_USER_SELECTED,
  15                                     preferred_interval=location\
  16                                             .INTERVAL_DEFAULT)
  17         self.control.connect("error-verbose", self.on_error, self.loop)
  18         self.control.connect("gpsd-stopped", self.on_stop, self.loop)
  19
  20         self.device = location.GPSDevice()
  21         self.device.connect("changed", self.on_changed, self.control)
  22
  23     def update_location(self):
  24         """ Run the loop and update lat and long """
  25         self.reset()
  26         gobject.idle_add(self.start_location, self.control)
  27         self.loop.run()
  28
  29     def on_error(self, control, error, data):
  30         """ Handle errors """
  31         print "location error: %d... quitting" % error
  32         data.quit()
  33
  34     def on_changed(self, device, data):
  35         """ Set long and lat """
  36         if not device:
  37             return
  38         if device.fix:
  39             # once fix is found and long, lat available set long lat
  40             if device.fix[1] & location.GPS_DEVICE_LATLONG_SET:
  41                 # wait for a second fix before exiting
  42                 self.fix_count += 1
  43                 if self.fix_count > 1:
  44                     self.lat, self.long = device.fix[4:6]
  45                     data.stop()
  46
  47     def on_stop(self, control, data):
  48         """ Stop the location service """
  49         print "quitting"
  50         data.quit()
  51
  52     def start_location(self, data):
  53         """ Start the location service """
  54         self.fix_count = 0
  55         data.start()
  56         return False
  57
  58     def reset(self):
  59         """ Reset coordinates """
  60         self.lat = None
  61         self.long = None
  62         self.device.reset_last_known()
  63