How to use the fabio.app._qt function in fabio

splitter3.addWidget(queuegroupBox)

        loggroupBox = qt.QGroupBox(tab2)
        loggroupBox.setTitle("Log View:")

        logbox = qt.QHBoxLayout()
        self.log = qt.QPlainTextEdit()
        logbox.addWidget(self.log)

        loggroupBox.setLayout(logbox)
        splitter3.addWidget(loggroupBox)
        splitter3.setStretchFactor(1, 1)

        rightsidevbox.addWidget(splitter3)

        self.progressBar = qt.QProgressBar(tab2)
        self.progressBar.setProperty("value", 0)
        rightsidevbox.addWidget(self.progressBar)

        left2 = qt.QWidget()
        right2 = qt.QWidget()
        left2.setLayout(imagelistvbox)
        right2.setLayout(rightsidevbox)
        splitter2 = qt.QSplitter(qt.Qt.Horizontal)
        splitter2.addWidget(left2)
        splitter2.addWidget(right2)
        splitter2.setStretchFactor(1, 2)

        Bighbox2 = qt.QHBoxLayout()
        Bighbox2.addWidget(splitter2)

        tab2.setLayout(Bighbox2)

def __init__(self, parent=None):
        qt.QDialog.__init__(self, parent)
        self.resize(407, 250)
        self.setWindowTitle('Downsampling')
        buttonBox = qt.QDialogButtonBox(self)
        buttonBox.setGeometry(qt.QRect(45, 200, 341, 32))
        buttonBox.setOrientation(qt.Qt.Horizontal)
        buttonBox.setStandardButtons(qt.QDialogButtonBox.Cancel | qt.QDialogButtonBox.Ok)

        label = qt.QLabel(self)
        label.setGeometry(qt.QRect(38, 63, 181, 16))
        label.setText("Number of files to sum up:")

        self.lineEdit = qt.QLineEdit(self)
        self.lineEdit.setGeometry(qt.QRect(220, 58, 113, 25))

        label2 = qt.QLabel(self)
        label2.setGeometry(qt.QRect(90, 100, 131, 20))
        label2.setText("Starting Phi angle:")

        self.lineEdit2 = qt.QLineEdit(self)
        self.lineEdit2.setGeometry(qt.QRect(220, 95, 113, 25))

        label3 = qt.QLabel(self)
        label3.setGeometry(qt.QRect(151, 133, 101, 16))
        label3.setText("Phi step:")

label_2.setGeometry(qt.QRect(66, 76, 91, 16))
        label_2.setText("Dimention 2:")
        self.lineEdit = qt.QLineEdit(self)
        self.lineEdit.setGeometry(qt.QRect(185, 40, 91, 25))
        self.lineEdit_2 = qt.QLineEdit(self)
        self.lineEdit_2.setGeometry(qt.QRect(185, 70, 91, 25))
        label_5 = qt.QLabel(self)
        label_5.setGeometry(qt.QRect(105, 106, 51, 16))
        label_5.setText("Offset:")
        self.lineEdit_3 = qt.QLineEdit(self)
        self.lineEdit_3.setGeometry(qt.QRect(184, 100, 91, 25))
        self.lineEdit_3.setText('0')
        label_3 = qt.QLabel(groupBox)
        label_3.setGeometry(qt.QRect(70, 130, 91, 16))
        label_3.setText("ByteCode:")
        self.comboBox = qt.QComboBox(groupBox)
        self.comboBox.setGeometry(qt.QRect(173, 123, 91, 25))
        bytecodes = ["int8", "int16", "int32", "int64",
                     "uint8", "uint16", "uint32", "uint64",
                     "float32", "float64"]
        for bytecode in bytecodes:
            self.comboBox.addItem(bytecode)
        self.comboBox.setCurrentIndex(2)
        label_4 = qt.QLabel(self)
        label_4.setGeometry(qt.QRect(98, 170, 61, 16))
        label_4.setText("Endian:")
        self.comboBox_2 = qt.QComboBox(self)
        self.comboBox_2.setGeometry(qt.QRect(182, 166, 91, 25))
        self.comboBox_2.addItem("Short")
        self.comboBox_2.addItem("Long")

        buttonBox.rejected.connect(self.cancel)

def exec_(self):
        if qt.QDialog.exec_(self) == qt.QDialog.Accepted:
            if str(self.lineEdit.text()) != '':
                return str(self.lineEdit.text())
            else:
                message = "All informations are mandatory, please fill the blanks"
                qt.QMessageBox.warning(self, 'Warning', message)
        else:
            return self.counter_format

self.imagelistWidget = qt.QListWidget(tab2)
        import_view_button = qt.QPushButton('Export image to View Mode', tab2)
        import_view_button.clicked.connect(self.batch_to_view)

        imagelistvbox.addWidget(imagelistlabel)
        imagelistvbox.addWidget(self.imagelistWidget)
        imagelistvbox.addWidget(import_view_button)

        rightsidevbox = qt.QVBoxLayout()

        optiongroupBox = qt.QGroupBox(tab2)
        optiongroupBox.setTitle("File Modes:")

        optionbox = qt.QVBoxLayout()

        self.butttonGroup = qt.QButtonGroup()

        self.filecheckBox = qt.QCheckBox()
        self.filecheckBox.setText("Sequential access (for large data series)")
        self.filecheckBox.stateChanged.connect(self.sequential_option)
        self.butttonGroup.addButton(self.filecheckBox)

        self.filecheckBox2 = qt.QCheckBox()
        self.filecheckBox2.setText("Direct access (all images are store in memory simultaneously)")
        self.filecheckBox2.setChecked(True)
        self.butttonGroup.addButton(self.filecheckBox2)

        self.butttonGroup.setExclusive(True)

        optionbox.addWidget(self.filecheckBox)
        optionbox.addWidget(self.filecheckBox2)

def main():
    parser = ArgumentParser(prog="fabio_viewer", usage="fabio_viewer img1 img2... imgn",
                            description=__doc__,
                            epilog="Based on FabIO version %s" % fabio.version)
    parser.add_argument("images", nargs="*")
    parser.add_argument("-V", "--version", action='version', version=__version__, help="Print version & quit")
    args = parser.parse_args()
    qt.QApplication.setStyle(qt.QStyleFactory.create("Cleanlooks"))
    app = qt.QApplication([])
    form = AppForm()
    if args.images:
        form.open_data_series(args.images)
    form.show()
    return app.exec_()

def create_action(self, text, slot=None, shortcut=None, icon=None, tip=None, checkable=False, signal="triggered"):
        action = qt.QAction(text, self)
        if icon is not None:
            action.setIcon(qt.QIcon(":/%s.png" % icon))
        if shortcut is not None:
            action.setShortcut(shortcut)
        if tip is not None:
            action.setToolTip(tip)
            action.setStatusTip(tip)
        if slot is not None:
            getattr(action, signal).connect(slot)

        if checkable:
            action.setCheckable(True)
        return action

def _getSaveFileNameAndFilter(self, parent=None, caption='', directory='',
                                  filter=''):
        dialog = qt.QFileDialog(parent, caption=caption, directory=directory)
        dialog.setAcceptMode(qt.QFileDialog.AcceptSave)
        dialog.setNameFilter(filter)
        result = dialog.exec_()
        if not result:
            return "", ""
        return dialog.selectedFiles()[0], dialog.selectedNameFilter()