How to use the ginga.qtw.QtHelp.QtGui function in ginga

def build_gui(self, container):
        sw = QtGui.QScrollArea()

        twidget = QtHelp.VBox()
        sp = QtGui.QSizePolicy(QtGui.QSizePolicy.MinimumExpanding,
                               QtGui.QSizePolicy.Fixed)
        twidget.setSizePolicy(sp)
        vbox1 = twidget.layout()
        vbox1.setContentsMargins(4, 4, 4, 4)
        vbox1.setSpacing(2)
        sw.setWidgetResizable(True)
        sw.setWidget(twidget)

        msgFont = self.fv.getFont("sansFont", 14)
        tw = QtGui.QLabel()
        tw.setFont(msgFont)
        tw.setWordWrap(True)
        self.tw = tw

path = str(self.entry.text()).strip()
        self.browse(path)

    def save_as_cb(self):
        path = str(self.entry2.text()).strip()
        if not path.startswith('/'):
            path = os.path.join(self.curpath, path)

        image = self.fitsimage.get_image()
        self.fv.error_wrap(image.save_as_file, path)

    def __str__(self):
        return 'fbrowser'


class DragTable(QtGui.QTableWidget):
    # This class exists only to let us drag and drop files from the
    # file pane into the Ginga widget.

    def __init__(self, parent=None, plugin=None):
        super(DragTable, self).__init__(parent)
        self.setDragEnabled(True)
        self.setSelectionBehavior(QtGui.QAbstractItemView.SelectRows)
        self.plugin = plugin

    def dragEnterEvent(self, event):
        if event.mimeData().hasFormat("text/uri-list"):
            event.setDropAction(QtCore.Qt.MoveAction)
            event.accept()
        else:
            event.ignore()

return

        # only consider this a drag if user has moved a certain amount
        # away from the press position
        if ((event.pos() - self.drag_start_position).manhattanLength() <
            QApplication.startDragDistance()):
            return

        # prepare formatted possibilities on drop
        mimeData = QtCore.QMimeData()
        chname, name, path = self._dragdata
        data = "%s||%s||%s" % (chname, name, path)
        mimeData.setData("text/thumb", data)
        mimeData.setData("text/plain", path)

        drag = QtGui.QDrag(self)
        drag.setMimeData(mimeData)
        drag.setPixmap(self.pixmap())
        drag.setHotSpot(event.pos() - self.rect().topLeft())

        self.event_type = 'drag'
        #dropAction = drag.start(QtCore.Qt.CopyAction | QtCore.Qt.MoveAction)

def __init__(self, rows=1, columns=1):
        super(GridBox, self).__init__()

        w = QtGui.QWidget()
        layout = QtGui.QGridLayout()
        w.setLayout(layout)
        self.widget = w

def __init__(self, parent=None, plugin=None):
        super(DragTable, self).__init__(parent)
        self.setDragEnabled(True)
        self.setSelectionBehavior(QtGui.QAbstractItemView.SelectRows)
        self.plugin = plugin

vbox = QtGui.QVBoxLayout()
        vbox.setContentsMargins(QtCore.QMargins(2, 2, 2, 2))
        vbox.setSpacing(1)

        vbox.addWidget(w, stretch=1)

        self.readout = QtGui.QLabel("")
        vbox.addWidget(self.readout, stretch=0,
                       alignment=QtCore.Qt.AlignCenter)

        hbox = QtGui.QHBoxLayout()
        hbox.setContentsMargins(QtCore.QMargins(4, 2, 4, 2))

        wopen = QtGui.QPushButton("Open File")
        wopen.clicked.connect(self.open_file)
        wquit = QtGui.QPushButton("Quit")
        wquit.clicked.connect(self.close)

        hbox.addStretch(1)
        for w in (wopen, wquit):
            hbox.addWidget(w, stretch=0)

        hw = QtGui.QWidget()
        hw.setLayout(hbox)
        vbox.addWidget(hw, stretch=0)

        vw = QtGui.QWidget()
        self.setCentralWidget(vw)
        vw.setLayout(vbox)

        fi.configure(512, 512)

def __init__(self):
        super(StatusBar, self).__init__()

        sbar = QtGui.QStatusBar()
        self.widget = sbar

def set_tab_position(self, tabpos):
        w = self.widget
        if tabpos == 'top':
            w.setTabPosition(QtGui.QTabWidget.North)
        elif tabpos == 'bottom':
            w.setTabPosition(QtGui.QTabWidget.South)
        elif tabpos == 'left':
            w.setTabPosition(QtGui.QTabWidget.West)
        elif tabpos == 'right':
            w.setTabPosition(QtGui.QTabWidget.East)

def add_dialogs(self):
        filesel = QtGui.QFileDialog(self.w.root, directory=os.curdir)
        #filesel.setFileMode(QtGui.QFileDialog.ExistingFile)
        filesel.setViewMode(QtGui.QFileDialog.Detail)
        self.filesel = filesel

Usage:
   example1_mpl.py [fits file]
"""

import sys

from matplotlib.figure import Figure

from ginga.qtw.QtHelp import QtGui, QtCore
from ginga.mplw.ImageViewCanvasMpl import ImageViewCanvas
from ginga.mplw.FigureCanvasQt import FigureCanvas
from ginga.misc import log
from ginga.util.loader import load_data


class FitsViewer(QtGui.QMainWindow):

    def __init__(self, logger):
        super(FitsViewer, self).__init__()
        self.logger = logger

        fig = Figure()
        w = FigureCanvas(fig)

        fi = ImageViewCanvas(logger=self.logger)
        fi.enable_autocuts('on')
        fi.set_autocut_params('zscale')
        fi.enable_auto_orient(True)
        fi.enable_autozoom('on')
        #fi.set_callback('drag-drop', self.drop_file)
        fi.set_callback('none-move', self.motion)
        fi.set_bg(0.2, 0.2, 0.2)