[PyQt] Have to close dialog boxes twice

[Thorsten Kampe]

Hi,

I've created a simple application with exit, help and about actions 
that are available via menu and via toolbars. This application works 
fine.

Now I tried to separate the layout from the code logic by using Qt 
Designer and generating and importing an Ui file. This works fine, 
too. Except that with the modified version I have to click twice on 
the close or Ok button to close the dialog boxes and I have no idea 
why. Can anyone give a clueless person a clue?

## The code
#! /usr/bin/env python

import sys
from PyQt4 import QtGui, \
                  QtCore
import ui_my_application

class MainWindow(QtGui.QMainWindow, ui_my_application.Ui_MainWindow):
    def __init__(self):
        QtGui.QMainWindow.__init__(self)
        self.setupUi(self)

        # set status bar
        self.statusBar().showMessage(self.tr('Ready'))

        # read settings
        settings = QtCore.QSettings()
        self.restoreGeometry(settings.value('Geometry').toByteArray())

    def on_action_About_triggered(self):
        QtGui.QMessageBox.about(self, self.tr('About Application'),
                                      self.tr('My Application does something\n'
                                              'This software comes without warranty, liability or support!'))

    def on_actionE_xit_triggered(self):
        settings = QtCore.QSettings()
        settings.setValue('Geometry', QtCore.QVariant(self.saveGeometry()))
        self.close()

    def on_action_Help_triggered(self):
        helpDialog = QtGui.QDialog(self)

        browser = QtGui.QTextBrowser()
        browser.append(self.tr('Help'))

        layout = QtGui.QVBoxLayout()
        layout.addWidget(browser)

        helpDialog.setLayout(layout)
        helpDialog.setWindowTitle(self.tr('Help'))
        helpDialog.show()

app     = QtGui.QApplication(sys.argv)

# Internationalization
qtTranslator  = QtCore.QTranslator()
qtTranslator.load(':/qt.qm')
app.installTranslator(qtTranslator)

appTranslator = QtCore.QTranslator()
appTranslator.load(':/my_application.qm')
app.installTranslator(appTranslator)
#

app.setOrganizationName('Trolltech')
app.setApplicationName('My Application')

mainWin = MainWindow()
mainWin.show()
app.exec_()
## End of code