Python四步設置與進度條

Question

我在下面的代碼有問題。當我運行它時，進度條會脈衝大約10秒鐘，然後繼續下載並顯示進度，但完成後它將不會移動到剛剛鎖定的下一步。

import sys 
import time 
import pygtk 
import gtk 
import gobject 
import threading 
import urllib 
import urlparse 

class WorkerThread(threading.Thread): 

    def __init__ (self, function, parent, arg = None): 
     threading.Thread.__init__(self) 
     self.function = function 
     self.parent = parent 
     self.arg = arg 
     self.parent.still_working = True 

    def run(self): # when does "run" get executed? 
     self.parent.still_working = True  
     if self.arg == None: 
      self.function() 
     else: 
      self.function(self.arg) 

     self.parent.still_working = False  

    def stop(self): 
     self = None 

class MainWindow: 
    def __init__(self): 
     gtk.gdk.threads_init() 
     self.wTree = gtk.Builder() 
     self.wTree.add_from_file("gui.glade") 
     self.mainWindows() 

    def mainWindows(self): 
     self.mainWindow = self.wTree.get_object("frmMain") 

     dic = { 
      "on_btnNext_clicked" : self.mainWindowNext, 
     } 
     self.wTree.connect_signals(dic) 

     self.mainWindow.show() 
     self.installerStep = 0 # 0 = none, 1 = preinstall, 2 = download, 3 = install info, 4 = install 
     #gtk.main() 
     self.mainWindowNext() 

    def pulse(self): 
     self.wTree.get_object("progress").pulse() 

     if self.still_working == False: 
      self.mainWindowNext() 

     return self.still_working 

    def preinstallStep(self): 
     self.wTree.get_object("progress").set_fraction(0) 
     self.wTree.get_object("btnNext").set_sensitive(0) 
     self.wTree.get_object("notebook1").set_current_page(0) 
     self.installerStep = 1 
     WT = WorkerThread(self.heavyWork, self) #Would do a heavy function here like setup some thing 
     WT.start() 

     gobject.timeout_add(75, self.pulse) 

    def downloadStep(self): 
     self.wTree.get_object("progress").set_fraction(0) 
     self.wTree.get_object("btnNext").set_sensitive(0) 
     self.wTree.get_object("notebook1").set_current_page(0) 
     self.installerStep = 2 
     urllib.urlretrieve('http://mozilla.mirrors.evolva.ro//firefox/releases/3.6.3/win32/en-US/Firefox%20Setup%203.6.3.exe', '/tmp/firefox.exe', self.updateHook) 

     self.mainWindowNext() 

    def updateHook(self, blocks, blockSize, totalSize): 
     percentage = float (blocks * blockSize)/totalSize 
     if percentage > 1: 
      percentage = 1 

     self.wTree.get_object("progress").set_fraction(percentage) 

     while gtk.events_pending(): 
      gtk.main_iteration() 

    def installInfoStep(self): 
     self.wTree.get_object("btnNext").set_sensitive(1) 
     self.wTree.get_object("notebook1").set_current_page(1) 
     self.installerStep = 3 

    def installStep(self): 
     self.wTree.get_object("progress").set_fraction(0) 
     self.wTree.get_object("btnNext").set_sensitive(0) 
     self.wTree.get_object("notebook1").set_current_page(0) 
     self.installerStep = 4 

     WT = WorkerThread(self.heavyWork, self) #Would do a heavy function here like setup some thing 
     WT.start() 

     gobject.timeout_add(75, self.pulse) 

    def mainWindowNext(self, widget = None): 
     if self.installerStep == 0: 
      self.preinstallStep() 
     elif self.installerStep == 1: 
      self.downloadStep() 
     elif self.installerStep == 2: 
      self.installInfoStep() 
     elif self.installerStep == 3: 
      self.installStep() 
     elif self.installerStep == 4: 
      sys.exit(0) 

    def heavyWork(self): 
     time.sleep(10) 

if __name__ == '__main__': 
    MainWindow() 
    gtk.main() 

我有一種感覺，它的東西用做：

while gtk.events_pending(): 
    gtk.main_iteration() 

是否有這樣做的更好的辦法？

Answer 1

永遠不要做：

while gtk.events_pending(): 
    gtk.main_iteration() 

除非你真的知道自己在做什麼。使用塊=假和一些延誤

def refresh_gui(delay=0.0001, wait=0.0001): 
    """Use up all the events waiting to be run 

    :param delay: Time to wait before using events 
    :param wait: Time to wait between iterations of events 

    This function will block until all pending events are emitted. This is 
    useful in testing to ensure signals and other asynchronous functionality 
    is required to take place. 

    (c) PyGTKHelpers Authors 2005-2010 
    """ 
    time.sleep(delay) 
    while gtk.events_pending(): 
     gtk.main_iteration_do(block=False) 
     time.sleep(wait) 

：如果你真的這樣做，這樣做like this。

如果你想使用線程，我個人不會建議像這樣的子類（沒有意義），相反，我會建議一個方法like this它有一個更新進度條的例子。