You need to access socket, serial ports, or other asynchronous but blocking I/O sources while running a GUI with pygtk.
The cookbook already gives example suited for Tkinker and PyQt.
Here is an attempt to do the same with pygtk based on the Tkinker and PyQt example.
Python, 342 lines
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import gtk
import gtk.glade
import sys
import threading
import Queue
import time
import random
class aJob:
"""this is a container for jobs"""
def __init__(self,id,label):
"""
instance variables:
id: a unique job id
label: a label (url to fect, file to read, whatever)
result: this will store the result (content of the file, whatever)
"""
self.id=id
self.label=label
self.result=None
class GuiPart:
""" this is the gui class, that is called in the main thread"""
def __init__(self,qIn,qOut):
"""
qIn in a Queue.Queue that store jobs to be done
qOut is a Queue.Queue that store result of completed jobs
The GuiPart is supposed to push stuff in qIn ,and regularly check
if new result are available in qOut
"""
self.qIn=qIn
self.qOut=qOut
self.jobCounter=0
self.currentJobId=None
self.xml=gtk.glade.XML("threadExample.glade")
self.timeoutHandler=gtk.timeout_add(100,self.processOutcoming)
dic={"on_quitButton_clicked":self.quitButton_clicked,
"on_goButton_clicked":self.goButton_clicked,
"on_entry1_activate":self.goButton_clicked,
"on_window1_destroy_event":self.endApplication,
"on_window1_delete_event":self.window1_delete
}
self.xml.signal_autoconnect(dic)
self.treeview1=self.xml.get_widget('treeview1')
#TreeStore column: job id, job label, status
self.treestore1=gtk.TreeStore(int,str,str)
self.treeview1.set_model(self.treestore1)
cellLabel=gtk.CellRendererText()
colLabel=gtk.TreeViewColumn('job')
colLabel.pack_start(cellLabel,True)
colLabel.add_attribute(cellLabel,'text',1)
self.treeview1.append_column(colLabel)
cellStatus=gtk.CellRendererText()
colStatus=gtk.TreeViewColumn('status')
colStatus.pack_start(cellStatus,True)
colStatus.add_attribute(cellStatus,'text',2)
self.treeview1.append_column(colStatus)
self.progressbar1=self.xml.get_widget('progressbar1')
def processOutcoming(self):
"""Handle all jobs currently in qOut, if any"""
# print "processOutcoming called"
if self.currentJobId!=None:
path=str(self.currentJobId)
treeiter=self.treestore1.get_iter(path)
self.treestore1.set_value(treeiter,2,'processing')
if self.qIn.qsize() or self.currentJobId!=None:
#self.progressbar1=self.xml.get_widget('progressbar1')
self.progressbar1.show()
self.progressbar1.pulse()
else:
self.progressbar1.hide()
while self.qOut.qsize():
try:
job=self.qOut.get(0)
# print "We have to deal with job",job.label
self.processResult(job)
except Queue.Empty:
print "qOut is empty"
pass
return gtk.TRUE
def processResult(self,job):
"""a new job has been processed, we have to display the result"""
id=job.id
path=str(id)
treeiter=self.treestore1.get_iter(path)
self.treestore1.set_value(treeiter,2,'done')
def goButton_clicked(self,widget):
label=self.xml.get_widget('entry1').get_text()
self.xml.get_widget('entry1').set_text('')
id=self.jobCounter
self.jobCounter+=1
job=aJob(id,label)
self.treestore1.append(None,[id,label,'pending'])
self.qIn.put(job)
def quitButton_clicked(self,widget):
self.endApplication()
def window1_delete(self,widget,event):
self.endApplication()
def endApplication(self):
print "time to die"
gtk.timeout_remove(self.timeoutHandler)
gtk.main_quit()
class ThreadedClient:
"""
This class launch the GuiPart and the worker thread.
"""
def __init__(self):
"""
This start the gui in a asynchronous thread. We are in the "main" thread of the application, wich will later be used by the gui as well. We spawn a new thread for the worker.
"""
gtk.threads_init()
self.qIn=Queue.Queue()
self.qOut=Queue.Queue()
self.gui=GuiPart(self.qIn,self.qOut)
self.running=True
self.incomingThread=threading.Thread(target=self.processIncoming)
#print "plop=",self.incomingThread
self.incomingThread.setDaemon(True)
self.incomingThread.start()
#print "pika=",pika
#gtk.threads_enter()
gtk.main()
self.running=False
#gtk.threads_leave()
def processIncoming(self):
"""
This is where the blocking I/O job is being done.
"""
while self.running:
while self.qIn.qsize():
# print "There are stuff in qIn"
try:
job=self.qIn.get(0)
self.gui.currentJobId=job.id
# print "Let s process job",job.label
time.sleep(random.random()*6)
job.result='we would store the resutl here'
self.gui.currentJobId=None
self.qOut.put(job)
except Queue.Empty:
pass
time.sleep(2)
def endApplication(self):
self.running=False
plop=ThreadedClient()
#######################
here comes the glade file:
#######################
<?xml version="1.0" standalone="no"?> <!--*- mode: xml -*-->
<!DOCTYPE glade-interface SYSTEM "http://glade.gnome.org/glade-2.0.dtd">
<glade-interface>
<widget class="GtkWindow" id="window1">
<property name="visible">True</property>
<property name="title" translatable="yes">window1</property>
<property name="type">GTK_WINDOW_TOPLEVEL</property>
<property name="window_position">GTK_WIN_POS_NONE</property>
<property name="modal">False</property>
<property name="default_width">250</property>
<property name="default_height">300</property>
<property name="resizable">True</property>
<property name="destroy_with_parent">False</property>
<property name="decorated">True</property>
<property name="skip_taskbar_hint">False</property>
<property name="skip_pager_hint">False</property>
<property name="type_hint">GDK_WINDOW_TYPE_HINT_NORMAL</property>
<property name="gravity">GDK_GRAVITY_NORTH_WEST</property>
<signal name="destroy_event" handler="on_window1_destroy_event" last_modification_time="Sun, 10 Apr 2005 09:05:18 GMT"/>
<signal name="delete_event" handler="on_window1_delete_event" last_modification_time="Sun, 10 Apr 2005 11:53:19 GMT"/>
<child>
<widget class="GtkVBox" id="vbox1">
<property name="visible">True</property>
<property name="homogeneous">False</property>
<property name="spacing">0</property>
<child>
<widget class="GtkHBox" id="hbox1">
<property name="visible">True</property>
<property name="homogeneous">False</property>
<property name="spacing">0</property>
<child>
<widget class="GtkButton" id="goButton">
<property name="visible">True</property>
<property name="can_focus">True</property>
<property name="label" translatable="yes">go</property>
<property name="use_underline">True</property>
<property name="relief">GTK_RELIEF_NORMAL</property>
<property name="focus_on_click">True</property>
<signal name="clicked" handler="on_goButton_clicked" last_modification_time="Sun, 10 Apr 2005 09:09:28 GMT"/>
</widget>
<packing>
<property name="padding">0</property>
<property name="expand">False</property>
<property name="fill">False</property>
<property name="pack_type">GTK_PACK_END</property>
</packing>
</child>
<child>
<widget class="GtkEntry" id="entry1">
<property name="visible">True</property>
<property name="can_focus">True</property>
<property name="editable">True</property>
<property name="visibility">True</property>
<property name="max_length">0</property>
<property name="text" translatable="yes"></property>
<property name="has_frame">True</property>
<property name="invisible_char" translatable="yes">*</property>
<property name="activates_default">False</property>
<signal name="activate" handler="on_entry1_activate" last_modification_time="Sun, 10 Apr 2005 14:27:45 GMT"/>
</widget>
<packing>
<property name="padding">0</property>
<property name="expand">True</property>
<property name="fill">True</property>
<property name="pack_type">GTK_PACK_END</property>
</packing>
</child>
</widget>
<packing>
<property name="padding">0</property>
<property name="expand">True</property>
<property name="fill">True</property>
</packing>
</child>
<child>
<widget class="GtkScrolledWindow" id="scrolledwindow1">
<property name="visible">True</property>
<property name="can_focus">True</property>
<property name="hscrollbar_policy">GTK_POLICY_ALWAYS</property>
<property name="vscrollbar_policy">GTK_POLICY_ALWAYS</property>
<property name="shadow_type">GTK_SHADOW_NONE</property>
<property name="window_placement">GTK_CORNER_TOP_LEFT</property>
<child>
<widget class="GtkTreeView" id="treeview1">
<property name="visible">True</property>
<property name="can_focus">True</property>
<property name="headers_visible">True</property>
<property name="rules_hint">False</property>
<property name="reorderable">False</property>
<property name="enable_search">True</property>
</widget>
</child>
</widget>
<packing>
<property name="padding">0</property>
<property name="expand">True</property>
<property name="fill">True</property>
</packing>
</child>
<child>
<widget class="GtkHBox" id="hbox2">
<property name="visible">True</property>
<property name="homogeneous">False</property>
<property name="spacing">0</property>
<child>
<widget class="GtkProgressBar" id="progressbar1">
<property name="visible">True</property>
<property name="orientation">GTK_PROGRESS_LEFT_TO_RIGHT</property>
<property name="fraction">0</property>
<property name="pulse_step">0.1</property>
</widget>
<packing>
<property name="padding">0</property>
<property name="expand">True</property>
<property name="fill">True</property>
</packing>
</child>
<child>
<widget class="GtkButton" id="quitButton">
<property name="visible">True</property>
<property name="can_focus">True</property>
<property name="label">gtk-quit</property>
<property name="use_stock">True</property>
<property name="relief">GTK_RELIEF_NORMAL</property>
<property name="focus_on_click">True</property>
<signal name="clicked" handler="on_quitButton_clicked" last_modification_time="Sun, 10 Apr 2005 09:10:40 GMT"/>
</widget>
<packing>
<property name="padding">0</property>
<property name="expand">False</property>
<property name="fill">False</property>
<property name="pack_type">GTK_PACK_END</property>
</packing>
</child>
</widget>
<packing>
<property name="padding">0</property>
<property name="expand">False</property>
<property name="fill">True</property>
</packing>
</child>
</widget>
</child>
</widget>
</glade-interface>
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Things would be more effecive with a pool of threads, but the main point was to avoid graphical freezing, not to improve effectiveness.
I m not really sure if playing with currentJobId without any locking mechanism is safe, but it looks like it is as there is only one worker thread anyway.
Tags: threads
