这是我的国际空间站指示器。我正在尝试创建一个显示倒计时的 GTK MenuItem。这将在使用 AppIndicator3 的 Ubuntu Unity 指示器中。我希望此 MenuItem ( futpass) 每秒刷新一次（即，倒计时实时出现），但也希望它在未选择菜单时保持不活动状态，以免消耗系统资源。问题是，我不能让它自己刷新。
因为每次checkiss需要运行之间都有很长的等待时间，所以我还需要知道在设定的时间以最少的 CPU 唤醒来调用此函数的正确方法。
到目前为止，这是我的（粗略）代码：
#!/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()