PyQt 4--QThread実現インタフェースとアルゴリズムの分離--2

#!/usr/local/bin/python
#-*- coding: UTF-8 -*-
#coding : gbk

# -*- coding: utf-8 -*-
from PyQt4.QtCore import *
from PyQt4.QtGui import *
import sys
import os
import time

class Test(QDialog):
    def __init__(self,parent=None):
        super(Test,self).__init__(parent)
        self.thread=Worker()
        self.listFile=QListWidget()
        self.btnStart=QPushButton('Start')
        layout=QGridLayout(self)
        layout.addWidget(self.listFile,0,0,1,2)
        layout.addWidget(self.btnStart,1,1)
        self.connect(self.btnStart,SIGNAL('clicked()'),self.slotStart)
        #self.connect(self.btnStart,SIGNAL('clicked()'),self.thread.start())
        self.connect(self.thread,SIGNAL('output(QString)'),self.slotAdd)
    def slotAdd(self,file_inf):
        self.listFile.addItem(file_inf)
    def slotStart(self):
        #self.btnStart.setEnabled(False)
        self.thread.start()
class Worker(QThread):
    def __init__(self,parent=None):
        super(Worker,self).__init__(parent)
        self.working=True
        self.num=0
    def __del__(self):
        self.working=False
        self.wait()
    def run(self):
        #while self.working==True:
        file_str='File index {0}'.format(self.num)
        self.num+=1
        self.emit(SIGNAL('output(QString)'),file_str)
        #self.sleep(3)
app=QApplication(sys.argv)
dlg=Test()
dlg.show()
sys.exit(app.exec_())