これは私の国際宇宙ステーションのインジケーターです。カウントダウンを表示するGTKMenuItemを作成しようとしています。これは、AppIndicator3を使用するUbuntuUnityインジケーターに含まれます。このMenuItem（futpass）を毎秒更新する（つまり、カウントダウンがリアルタイムで表示される）だけでなく、システムリソースを消費しないように、メニューが選択されていないときに非アクティブのままにしておく必要があります。問題は、それを自分でリフレッシュさせることができないということです。
checkiss実行する必要があるたびに長い待機期間があるため、CPUのウェイクアップを最小限に抑えて、設定された時間にこの関数を呼び出すための適切なアプローチも知っておく必要があります。
これまでの私の（大まかな）コードは次のとおりです。
#!/usr/bin/env python
#print time.localtime( time.time() )
import json, urllib2, time, math
#indicator
from gi.repository import Gtk
from gi.repository import AppIndicator3 as appindicator
class indicator():
def __init__(self):
#create indicator
self.ind = appindicator.Indicator.new (
"issindicator",
"indicator-messages",
#"indicator-messages",
appindicator.IndicatorCategory.APPLICATION_STATUS)
self.ind.set_status (appindicator.IndicatorStatus.ACTIVE)
self.ind.set_attention_icon ("indicator-messages-new")
#dropdown menu
#now items
self.menu = Gtk.Menu()
self.curpass = Gtk.MenuItem("not refreshed")
self.curpass.connect("activate", self.checkiss)
self.menu.append(self.curpass)
self.curpassdur = Gtk.MenuItem(" ")
self.menu.append(self.curpassdur)
self.curpassrise = Gtk.MenuItem(" ")
self.menu.append(self.curpassrise)
self.curpassset = Gtk.MenuItem(" ")
self.menu.append(self.curpassset)
self.sep1 = Gtk.SeparatorMenuItem()
self.menu.append(self.sep1)
#future items
self.futpass = Gtk.MenuItem(" ")
self.menu.append(self.futpass)
self.sep2 = Gtk.SeparatorMenuItem()
self.menu.append(self.sep2)
#Options
self.aboutmenu = Gtk.MenuItem("About")
self.aboutmenu.connect("activate", self.onabout)
self.menu.append(self.aboutmenu)
self.quit = Gtk.MenuItem("Quit")
self.quit.connect("activate", self.quitnow)
self.menu.append(self.quit)
self.curpass.show()
self.sep1.show()
self.futpass.show()
self.sep2.show()
self.aboutmenu.show()
self.quit.show()
self.ind.set_menu(self.menu)
#get iss data
self.updatecache()
self.checkiss()
Gtk.main()
#define code to hide or show icon
def hideicon(self, w=None):
self.ind.set_status (appindicator.IndicatorStatus.PASSIVE)
def showicon(self, w=None):
self.ind.set_status (appindicator.IndicatorStatus.ACTIVE)
def quitnow(self, w=None):
Gtk.main_quit()
def onabout(self,widget):
widget.set_sensitive(False)
ad=Gtk.AboutDialog()
ad.set_name("aboutdialog")
ad.set_version("0.1")
ad.set_copyright('Copyrignt (c) 2013 mh00h')
ad.set_comments('Indicating ISS Zarya')
ad.set_license(''+
'This program is free software: you can redistribute it and/or modify it\n'+
'under the terms of the GNU General Public License as published by the\n'+
'Free Software Foundation, either version 3 of the License, or (at your option)\n'+
'any later version.\n\n'+
'This program is distributed in the hope that it will be useful, but\n'+
'WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY\n'+
'or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for\n'+
'more details.\n\n'+
'You should have received a copy of the GNU General Public License along with\n'+
'this program. If not, see <http://www.gnu.org/licenses/>.')
ad.set_website('https://launchpad.net/~mh00h/+archive/issindicator')
ad.set_website_label('ISSIndicator Homepage')
ad.set_authors(['mh00h'])
ad.run()
ad.destroy()
widget.set_sensitive(True)
def updatecache(self, w=None):
self.passingstatus = 'not set yet'
#get ISS data from api
self.ip = urllib2.urlopen("http://api.exip.org/?call=ip").read()
self.geoip = json.load(urllib2.urlopen("http://freegeoip.net/json/"+self.ip))
self.data = json.load(urllib2.urlopen("http://api.open-notify.org/iss/?lat="+str(self.geoip["latitude"])+"&lon="+str(self.geoip["longitude"])+"&alt=280&n=27"))
def checkiss(self, w=None):
self.n = 0
self.passingstatus = "The ISS is not overhead."
#check if cache is out of date and update if needed
if time.time() > self.data['response'][len(self.data['response'])-1]['risetime']:
self.updatecache
for k in self.data['response']:
duration = self.data['response'][self.n]['duration']
risetime = self.data['response'][self.n]['risetime']
settime = risetime + duration
#print risetime, time.time(), settime
if risetime <= time.time() <= settime:
self.showicon()
self.passingstatus = "The ISS is overhead"
self.curpass.get_child().set_text(self.passingstatus)
self.curpassdur.get_child().set_text("Duration: "+
str(time.strftime('%M:%S', time.gmtime(duration)))+" ("+
str(time.strftime('%M:%S', time.gmtime(time.time()-duration)))+" remaining)")
self.curpassdur.show()
self.curpassrise.get_child().set_text("Rise time: "+time.strftime('%H:%M:%S', time.gmtime(risetime)))
self.curpassrise.show()
self.curpassset.get_child().set_text("Set time: "+time.strftime('%H:%M:%S', time.gmtime(settime)))
self.curpassset.show()
break
else:
self.n += 1
if self.passingstatus != "The ISS is overhead":
self.curpass.get_child().set_text(self.passingstatus)
self.curpassdur.hide()
self.curpassrise.hide()
self.curpassset.hide()
#self.hideicon()
#regardless of isspass, show the next pass time
if self.n != len(self.data['response']):
self.futpass.get_child().set_text("Next Pass: "+str(time.strftime('%H:%M:%S', time.gmtime(self.data['response'][self.n]['risetime'])))+" ("+str(time.strftime('%H:%M:%S', time.gmtime(self.data['response'][self.n+1]['risetime']-time.time())))+")")
else:
self.futpass.get_child().set_text("Next Pass: "+str(time.strftime('%H:%M:%S', time.gmtime(self.data['response'][0]['risetime'])))+" ("+str(time.strftime('%H:%M:%S', time.gmtime(self.data['response'][0]['risetime']-time.time())))+")")
if __name__ == '__main__':
issindicator = indicator()