I'm trying to run a simple 'for' loop to execute some external programs
(ripping tracks with cdparanoia/lame, but I've stripped the problem down
to bare essentials that demonstrate the problem).
Each loop should update a gui label with the current loop number. The
setText statement is within the 'for' loop, but the gui doesn't get
updated until the loop is either completed or several iterations into
the complete loop. The loop works, but the updates to the label do not.
The Gui was created with QTDesigner, and I'm using python 2.6.4 on
Ubuntu 9.10.
The statements that are crucial follow below, and I've attached the two
py files if you care to see the full code.
Any suggestions for getting the label.setText statements to update the
gui with each loop iteration, would be appreciated.
TIA,
Dan Cherry
def runloop(self):
self.ui.label.setText('Begin Loop') ## <--doesn't update before
loop
for i in range(1,6):
self.ui.label.setText('loop %s' % i) ## <--doesn't update
for each loop - but does update after the loop completes
rval = self.loop(i)
def loop(self, loop_no):
time.sleep(3)
print loop_no ## <--the print statements display properly as
the loop progresses
return
# -*- coding: utf-8 -*-
# Form implementation generated from reading ui file 'settext.ui'
#
# Created: Mon Feb 15 11:01:26 2010
# by: PyQt4 UI code generator 4.6
#
# WARNING! All changes made in this file will be lost!
from PyQt4 import QtCore, QtGui
class Ui_SetTextTest(object):
def setupUi(self, SetTextTest):
SetTextTest.setObjectName("SetTextTest")
SetTextTest.resize(383, 247)
self.centralwidget = QtGui.QWidget(SetTextTest)
self.centralwidget.setObjectName("centralwidget")
self.pushButton_Loop = QtGui.QPushButton(self.centralwidget)
self.pushButton_Loop.setGeometry(QtCore.QRect(100, 30, 115, 30))
self.pushButton_Loop.setObjectName("pushButton_Loop")
self.label = QtGui.QLabel(self.centralwidget)
self.label.setGeometry(QtCore.QRect(110, 140, 221, 21))
self.label.setObjectName("label")
SetTextTest.setCentralWidget(self.centralwidget)
self.menubar = QtGui.QMenuBar(SetTextTest)
self.menubar.setGeometry(QtCore.QRect(0, 0, 383, 27))
self.menubar.setObjectName("menubar")
SetTextTest.setMenuBar(self.menubar)
self.statusbar = QtGui.QStatusBar(SetTextTest)
self.statusbar.setObjectName("statusbar")
SetTextTest.setStatusBar(self.statusbar)
self.retranslateUi(SetTextTest)
QtCore.QMetaObject.connectSlotsByName(SetTextTest)
def retranslateUi(self, SetTextTest):
SetTextTest.setWindowTitle(QtGui.QApplication.translate("SetTextTest", "MainWindow", None, QtGui.QApplication.UnicodeUTF8))
self.pushButton_Loop.setText(QtGui.QApplication.translate("SetTextTest", "Start Loop", None, QtGui.QApplication.UnicodeUTF8))
self.label.setText(QtGui.QApplication.translate("SetTextTest", "Ready", None, QtGui.QApplication.UnicodeUTF8))
#!/usr/bin/env python
# -*- coding: utf-8 -*-
import sys, time
from PyQt4 import QtCore, QtGui
from settextgui import Ui_SetTextTest
class StartQT4(QtGui.QMainWindow):
def __init__(self, parent=None):
QtGui.QWidget.__init__(self, parent)
self.ui = Ui_SetTextTest()
self.ui.setupUi(self)
QtCore.QObject.connect(self.ui.pushButton_Loop,QtCore.SIGNAL("clicked()"), self.runloop)
def runloop(self):
self.ui.label.setText('Begin Loop') ## <--doesn't update before loop
for i in range(1,6):
self.ui.label.setText('loop %s' % i) ## <--doesn't update for each loop
rval = self.loop(i)
def loop(self, loop_no):
time.sleep(3)
print loop_no
return
if __name__ == "__main__":
app = QtGui.QApplication(sys.argv)
myapp = StartQT4()
myapp.show()
sys.exit(app.exec_())
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