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

def build_info(captions, orientation='vertical'):
    # numrows = len(captions)
    numcols = reduce(lambda acc, tup: max(acc, len(tup)), captions, 0)
    if (numcols % 2) != 0:
        raise ValueError("Column spec is not an even number")
    numcols = int(numcols // 2)

    widget = QtGui.QWidget()
    table = QtGui.QGridLayout()
    widget.setLayout(table)
    table.setVerticalSpacing(2)
    table.setHorizontalSpacing(4)
    table.setContentsMargins(2, 2, 2, 2)

    wb = Bunch.Bunch()
    row = 0
    for tup in captions:
        col = 0
        while col < numcols:
            idx = col * 2
            if idx < len(tup):
                title, wtype = tup[idx:idx + 2]
                if not title.endswith(':'):
                    name = name_mangle(title)

hbox.addWidget(btn1)

        btn2 = QtGui.QRadioButton("Edit")
        btn2.setChecked(mode == 'edit')
        btn2.toggled.connect(lambda val: self.set_mode_cb('edit', val))
        btn2.setToolTip("Choose this to edit things on the canvas")
        hbox.addWidget(btn2)

        btn3 = QtGui.QRadioButton("Pick")
        btn3.setChecked(mode == 'pick')
        btn3.toggled.connect(lambda val: self.set_mode_cb('pick', val))
        btn3.setToolTip("Choose this to pick things on the canvas")
        hbox.addWidget(btn3)

        hbox.addWidget(QtGui.QLabel(''), stretch=1)
        hw = QtGui.QWidget()
        hw.setLayout(hbox)
        vbox.addWidget(hw, stretch=0)

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

self.w.mnb.subWindowActivated.connect(self.page_switch_mdi_cb)
            self.w.mnb.set_mode('tabs')
        else:
            self.w.mnb.currentChanged.connect(self.page_switch_cb)

        # readout
        if self.settings.get('share_readout', True):
            self.readout = self.build_readout()
            self.add_callback('field-info', self.readout_cb, self.readout, None)
            rw = self.readout.get_widget()
            # one level deeper to the native widget in gw.Readout
            rw = rw.get_widget()
            self.w.vbox.addWidget(rw, stretch=0)

        # bottom buttons
        plw = QtGui.QWidget()
        hbox = QtGui.QHBoxLayout()
        hbox.setContentsMargins(0, 0, 0, 0)
        hbox.setSpacing(2)
        plw.setLayout(hbox)

        cbox1 = QtHelp.ComboBox()
        self.w.channel = cbox1
        cbox1.setToolTip("Select a channel")
        cbox1.activated.connect(self.channel_select_cb)
        hbox.addWidget(cbox1, stretch=0)

        opmenu = QtGui.QMenu()
        self.w.operation = opmenu
        btn = QtGui.QPushButton("Operation")
        btn.clicked.connect(self.invoke_op_cb)
        btn.setToolTip("Invoke operation")

if parent is not None:
            parent = parent.get_widget()
        self.widget = QtGui.QDialog(parent)
        self.widget.setModal(modal)

        vbox = QtGui.QVBoxLayout()
        vbox.setContentsMargins(0, 0, 0, 0)
        self.widget.setLayout(vbox)

        TopLevelMixin.__init__(self, title=title)

        self.content = VBox()
        vbox.addWidget(self.content.get_widget(), stretch=1)

        if len(buttons) > 0:
            hbox_w = QtGui.QWidget()
            hbox = QtGui.QHBoxLayout()
            hbox_w.setLayout(hbox)

            for name, val in buttons:
                btn = QtGui.QPushButton(name)

                def cb(val):
                    return lambda: self._cb_redirect(val)

                btn.clicked.connect(cb(val))
                hbox.addWidget(btn, stretch=0)

            vbox.addWidget(hbox_w, stretch=0)
            # self.widget.closeEvent = lambda event: self.delete()

        self.enable_callback('activated')

def _create_info_window(self):
        sw = QtGui.QScrollArea()

        widget = QtGui.QWidget()
        vbox = QtGui.QVBoxLayout()
        vbox.setContentsMargins(2, 2, 2, 2)
        widget.setLayout(vbox)
        
        captions = (('Name', 'label'), ('Object', 'label'),
                    ('X', 'label'), ('Y', 'label'), ('Value', 'label'),
                    ('RA', 'label'), ('DEC', 'label'),
                    ('Equinox', 'label'), ('Dimensions', 'label'),
                    #('Slices', 'label', 'MultiDim', 'button'),
                    ('Min', 'label'), ('Max', 'label'),
                    ('Zoom', 'label'), 
                    ('Cut Low', 'xlabel', '@Cut Low', 'entry'),
                    ('Cut High', 'xlabel', '@Cut High', 'entry'),
                    ('Auto Levels', 'button', 'Cut Levels', 'button'), 
                    ('Cut New', 'label'), ('Zoom New', 'label'), 
                    ('Preferences', 'button'),

# Add matplotlib buttons
        hbox = QtGui.QHBoxLayout()
        hbox.setContentsMargins(QtCore.QMargins(4, 2, 4, 2))

        wgetimg = QtGui.QPushButton("Get Data")
        wgetimg.clicked.connect(self.get_image)
        wgetrgb = QtGui.QPushButton("Get RGB")
        wgetrgb.clicked.connect(self.get_rgb_image)
        #wquit = QtGui.QPushButton("Quit")
        #wquit.clicked.connect(self.close)

        hbox.addStretch(1)
        for w in (wgetimg, wgetrgb):
            hbox.addWidget(w, stretch=0)

        hw = QtGui.QWidget()
        hw.setLayout(hbox)
        layout.addWidget(hw, stretch=0)
        vbox2.setLayout(layout)

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

        w = QtGui.QWidget()
        layout = QtGui.QHBoxLayout()
        layout.addWidget(vbox1, stretch=1.0)
        layout.addWidget(vbox2, stretch=1.0)
        w.setLayout(layout)

        vbox.addWidget(w, stretch=1)

tg.configure(200, 200)
        tg.enable_autozoom('on')
        tg.set_autocut_params('zscale')
        tg.enable_autocuts('override')
        tg.enable_auto_orient(True)
        tg.defer_redraw = False
        tg.set_bg(0.7, 0.7, 0.7)
        self.thumb_generator = tg

        sw = MyScrollArea()
        sw.setWidgetResizable(True)
        #sw.setEnabled(True)
        sw.thumbs_cb = self.thumbpane_resized_cb

        # Create thumbnails pane
        widget = QtGui.QWidget()
        vbox = QtGui.QGridLayout()
        vbox.setContentsMargins(4, 4, 4, 4)
        vbox.setSpacing(14)
        widget.setLayout(vbox)
        self.w.thumbs = vbox
        self.w.thumbs_w = widget
        #widget.show()
        sw.setWidget(widget)
        self.w.thumbs_scroll = sw
        #self.w.thumbs_scroll.connect("size_allocate", self.thumbpane_resized_cb)

        # TODO: should this even have it's own scrolled window?
        cw = container.get_widget()
        cw.addWidget(sw, stretch=1)
        sw.show()

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

        hbox.addStretch(1)
        for w in (wopen, wdrawtype, wdrawcolor, wfill,
                  QtGui.QLabel('Alpha:'), walpha, wclear, 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)

def __init__(self, title=''):
        super(Expander, self).__init__()

        # Qt doesn't seem to like it (segfault) if we actually construct
        # these icons in the class variable declarations
        if Expander.r_arrow is None:
            Expander.r_arrow = QtHelp.get_icon(
                os.path.join(icondir, 'triangle-right-48.png'), size=(12, 12))
        if Expander.d_arrow is None:
            Expander.d_arrow = QtHelp.get_icon(
                os.path.join(icondir, 'triangle-down-48.png'), size=(12, 12))

        self.widget = QtGui.QWidget()
        vbox = QtGui.QVBoxLayout()
        vbox.setContentsMargins(0, 0, 0, 0)
        vbox.setSpacing(0)
        self.layout = vbox

        self.toggle = QtGui.QPushButton(Expander.r_arrow, title)
        self.toggle.setStyleSheet(Expander.widget_style)
        # self.toggle.setCheckable(True)
        self.toggle.clicked.connect(self._toggle_widget)

        vbox.addWidget(self.toggle, stretch=0)
        self.widget.setLayout(vbox)

fi.ui_set_active(True)
        self.fitsimage = fi

        fi.show_color_bar(True)

        # enable various key and mouse controlled actions
        bd = fi.get_bindings()
        bd.enable_all(True)

        self.cp_tag = 'compass'

        # pack widget into layout
        gingaw = fi.get_widget()
        gingaw.resize(wd, ht)

        vbox1 = QtGui.QWidget()
        layout = QtGui.QVBoxLayout()
        layout.addWidget(gingaw, stretch=1)

        self.cm = cmap.get_cmap('gray')
        self.im = imap.get_imap('ramp')

        # color map selection widget
        wcmap = QtGui.QComboBox()
        for name in self.cmaps:
            wcmap.addItem(name)
        index = self.cmaps.index('gray')
        wcmap.setCurrentIndex(index)
        wcmap.activated.connect(self.set_cmap_cb)
        self.wcmap = wcmap

        # intensity map selection widget