<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
 <class>Form1</class>
 <widget class="QDialog" name="Form1">
  <property name="geometry">
   <rect>
    <x>0</x>
    <y>0</y>
    <width>400</width>
    <height>340</height>
   </rect>
  </property>
  <property name="windowTitle">
   <string>Dialog</string>
  </property>
  <widget class="QLineEdit" name="lineEdit1">
   <property name="geometry">
    <rect>
     <x>16</x>
     <y>256</y>
     <width>273</width>
     <height>22</height>
    </rect>
   </property>
  </widget>
  <widget class="QListWidget" name="listBox1">
   <property name="geometry">
    <rect>
     <x>16</x>
     <y>16</y>
     <width>369</width>
     <height>209</height>
    </rect>
   </property>
   <item>
    <property name="text">
     <string>New Item 1</string>
    </property>
   </item>
   <item>
    <property name="text">
     <string>New Item 2</string>
    </property>
   </item>
  </widget>
  <widget class="QPushButton" name="pushButton1">
   <property name="geometry">
    <rect>
     <x>296</x>
     <y>256</y>
     <width>83</width>
     <height>26</height>
    </rect>
   </property>
   <property name="text">
    <string>X</string>
   </property>
  </widget>
 </widget>
 <tabstops>
  <tabstop>listBox1</tabstop>
  <tabstop>lineEdit1</tabstop>
  <tabstop>pushButton1</tabstop>
 </tabstops>
 <resources/>
 <connections>
  <connection>
   <sender>pushButton1</sender>
   <signal>clicked()</signal>
   <receiver>listBox1</receiver>
   <slot>clear()</slot>
   <hints>
    <hint type="sourcelabel">
     <x>333</x>
     <y>270</y>
    </hint>
    <hint type="destinationlabel">
     <x>295</x>
     <y>191</y>
    </hint>
   </hints>
  </connection>
  <connection>
   <sender>lineEdit1</sender>
   <signal>returnPressed()</signal>
   <receiver>Form1</receiver>
   <slot>AddEntry()</slot>
   <hints>
    <hint type="sourcelabel">
     <x>152</x>
     <y>266</y>
    </hint>
    <hint type="destinationlabel">
     <x>199</x>
     <y>140</y>
    </hint>
   </hints>
  </connection>
 </connections>
 <slots>
  <slot>AddEntry()</slot>
 </slots>
</ui>

#!/usr/bin/env python
# -*- coding: utf-8 -*-

import sys
from PyQt4.QtCore import *
from PyQt4.QtGui import *
from PyQt4 import uic

class TdlgMain(QDialog):
  def __init__(self,parent=None):
    QDialog.__init__(self,parent)
    uic.loadUi('form1_x.ui',self)
    self.print_count()

  def AddEntry(self):
    print 'AddEntry(%r)'%self.lineEdit1.text()

    self.listBox1.addItem(self.lineEdit1.text())   # (1)

    self.print_count()
    self.setWindowTitle(str(self.listBox1.count()))

  def print_count(self):
    print 'Count: %r'%self.listBox1.count()

if __name__ =='__main__':
  app=QApplication(sys.argv)
  dlgMain=TdlgMain()
  dlgMain.show()
  sys.exit(app.exec_())