def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.search_bar = QLineEdit()
        search_bar_layout = QHBoxLayout()
        search_bar_layout.addWidget(QLabel('Custom Query:'))
        search_bar_layout.addWidget(self.search_bar)
        mongo_query_help_button = QPushButton()
        mongo_query_help_button.setText('?')
        search_bar_layout.addWidget(mongo_query_help_button)
        mongo_query_help_button.clicked.connect(self.show_mongo_query_help)

        self.since_widget = QDateTimeEdit()
        self.since_widget.setCalendarPopup(True)
        self.since_widget.setDisplayFormat('yyyy-MM-dd HH:mm')
        since_layout = QHBoxLayout()
        since_layout.addWidget(QLabel('Since:'))
        since_layout.addWidget(self.since_widget)

        self.until_widget = QDateTimeEdit()
        self.until_widget.setCalendarPopup(True)
        self.until_widget.setDisplayFormat('yyyy-MM-dd HH:mm')
        until_layout = QHBoxLayout()
        until_layout.addWidget(QLabel('Until:'))
        until_layout.addWidget(self.until_widget)

        layout = QVBoxLayout()
        layout.addLayout(since_layout)
        layout.addLayout(until_layout)
        layout.addLayout(search_bar_layout)
        self.setLayout(layout)

    def __init__(self, parent):
        QWidget.__init__(self, parent)

        self._parent = parent
        self.cp = CondaProcess(self)

        # Widgets
        self.button_get_conda_version = QPushButton('get_conda_version')
        self.button_info = QPushButton('info')
        self.button_get_envs = QPushButton('get envs')
        self.button_install = QPushButton('install')
        self.button_package_info = QPushButton('package info')
        self.button_linked = QPushButton('linked')
        self.button_pip = QPushButton('pip')
        self.button_pip_remove = QPushButton('pip-remove')

        self.widgets = [self.button_get_conda_version, self.button_info,
                        self.button_get_envs, self.button_install,
                        self.button_package_info, self.button_linked,
                        self.button_pip]

        # Layout setup
        layout_top = QHBoxLayout()
        layout_top.addWidget(self.button_get_conda_version)
        layout_top.addWidget(self.button_get_envs)
        layout_top.addWidget(self.button_info)
        layout_top.addWidget(self.button_install)
        layout_top.addWidget(self.button_package_info)

        layout_middle = QHBoxLayout()
        layout_middle.addWidget(self.button_linked)

        layout_bottom = QHBoxLayout()
        layout_bottom.addWidget(self.button_pip)
        layout_bottom.addWidget(self.button_pip_remove)

        layout = QVBoxLayout()
        layout.addLayout(layout_top)
        layout.addLayout(layout_middle)
        layout.addLayout(layout_bottom)

        self.setLayout(layout)

        # Signals
        self.cp.sig_started.connect(self.disable_widgets)
        self.cp.sig_finished.connect(self.on_finished)
        self.cp.sig_finished.connect(self.enable_widgets)

        self.button_get_conda_version.clicked.connect(
            self.cp.get_conda_version)
        self.button_get_envs.clicked.connect(self.cp.get_envs)
        self.button_info.clicked.connect(self.cp.info)
        self.button_install.clicked.connect(self.cp.install)
        self.button_package_info.clicked.connect(
            lambda: self.cp.package_info('spyder'))
        self.button_linked.clicked.connect(
            lambda: self.cp.linked(self.cp.ROOT_PREFIX))
        self.button_pip.clicked.connect(lambda: self.cp.pip(name='root'))
        self.button_pip_remove.clicked.connect(
            lambda: self.cp.pip_remove(name='root', pkgs=['grequests']))

    def __init__(self, parent):
        """
        Initialize plugin and corresponding widget.

        The part of the initialization that depends on `parent` is done in
        `self.register_plugin()`.
        """
        SpyderPluginWidget.__init__(self, parent)
        self.main = parent  # Spyder 3 compatibility

        # Create unit test widget. For compatibility with Spyder 3.x
        # here we check if the plugin has the attributes
        # 'options_button' and 'options_menu'. See issue 83
        if hasattr(self, 'options_button') and hasattr(self, 'options_menu'):
            # Works with Spyder 4.x
            self.unittestwidget = UnitTestWidget(
                self.main,
                options_button=self.options_button,
                options_menu=self.options_menu)
        else:
            # Works with Spyder 3.x
            self.unittestwidget = UnitTestWidget(self.main)

        # Add unit test widget in dockwindow
        layout = QVBoxLayout()
        layout.addWidget(self.unittestwidget)
        self.setLayout(layout)

        # Initialize plugin
        self.initialize_plugin()

    def _promote_widgets(self):
        graphicsView_layout = QVBoxLayout()
        self.ui.frame_graphicsView.setLayout(graphicsView_layout)
        self.ui.graphicsView = MplPlot3dCanvas(self)
        graphicsView_layout.addWidget(self.ui.graphicsView)

        return

    def create_controls(self):
        table = QTableView(self)
        self.model = PluginsModel(self.plugin_manager)
        table.setModel(self.model)
        h = table.horizontalHeader()
        h.setSectionResizeMode(QHeaderView.ResizeToContents)
        table.setHorizontalHeader(h)
        h = table.verticalHeader()
        h.setSectionResizeMode(QHeaderView.ResizeToContents)
        table.setVerticalHeader(h)
        self.table = table
        width = 80
        for i in range(3):
            width += table.columnWidth(i)

        btns = QDialogButtonBox(QDialogButtonBox.Ok | QDialogButtonBox.Cancel,
                                Qt.Horizontal)
        self.edit_btn = QPushButton("Edit")
        btns.addButton(self.edit_btn, QDialogButtonBox.ActionRole)
        self.edit_btn.clicked.connect(self.edit_plugin)
        btns.accepted.connect(self.accept)
        btns.rejected.connect(self.reject)

        vbox = QVBoxLayout()
        vbox.addWidget(table)
        vbox.addWidget(btns)
        self.setLayout(vbox)
        s = self.size()
        s.setHeight(table.rowHeight(0) * 10)
        s.setWidth(width)
        self.resize(s)

    def __init__(self, parent=None, stack=None):
        super(SchemeEditor, self).__init__(parent)
        self.parent = parent
        self.stack = stack
        self.order = []    # Uses scheme names

        # Needed for self.get_edited_color_scheme()
        self.widgets = {}
        self.scheme_name_textbox = {}
        self.last_edited_color_scheme = None
        self.last_used_scheme = None

        # Widgets
        bbox = QDialogButtonBox(QDialogButtonBox.Ok | QDialogButtonBox.Cancel)

        # Layout
        layout = QVBoxLayout()
        layout.addWidget(self.stack)
        layout.addWidget(bbox)
        self.setLayout(layout)

        # Signals
        bbox.accepted.connect(self.accept)
        bbox.accepted.connect(self.get_edited_color_scheme)
        bbox.rejected.connect(self.reject)

    def __init__(self, parent):
        super(WorkspaceWidget, self).__init__(parent)

        self._ads = AnalysisDataService.Instance()

        # layout
        self.workspacewidget = WorkspaceTreeWidget()
        layout = QVBoxLayout()
        layout.addWidget(self.workspacewidget)
        self.setLayout(layout)

        # behaviour
        self.workspacewidget.plotSpectrumClicked.connect(partial(self._do_plot_spectrum,
                                                                 errors=False, overplot=False))
        self.workspacewidget.overplotSpectrumClicked.connect(partial(self._do_plot_spectrum,
                                                                     errors=False, overplot=True))
        self.workspacewidget.plotSpectrumWithErrorsClicked.connect(partial(self._do_plot_spectrum,
                                                                           errors=True, overplot=False))
        self.workspacewidget.overplotSpectrumWithErrorsClicked.connect(partial(self._do_plot_spectrum,
                                                                               errors=True, overplot=True))
        self.workspacewidget.plotColorfillClicked.connect(self._do_plot_colorfill)
        self.workspacewidget.sampleLogsClicked.connect(self._do_sample_logs)
        self.workspacewidget.sliceViewerClicked.connect(self._do_slice_viewer)
        self.workspacewidget.showDataClicked.connect(self._do_show_data)
        self.workspacewidget.showInstrumentClicked.connect(self._do_show_instrument)
        self.workspacewidget.showAlgorithmHistoryClicked.connect(self._do_show_algorithm_history)

        self.workspacewidget.workspaceDoubleClicked.connect(self._action_double_click_workspace)

 def setup_ui(self):
     main = QHBoxLayout()
     sub = QVBoxLayout()
     for i in range(10):
         sub.addWidget(QLabel(str(i)))
     main.addLayout(sub)
     self.setLayout(main)

    def create_controls(self):
        """
        Create UI controls.
        """
        self.tabs = QTabWidget(self)

        # Fill in tabs by setting groups
        s = QSettings(self.ui)
        self._add_groups(s)

        # Add button bar at end
        btns = QDialogButtonBox(QDialogButtonBox.Ok | QDialogButtonBox.Apply |
                                QDialogButtonBox.Cancel |
                                QDialogButtonBox.Reset,
                                QtCore.Qt.Horizontal, self)
        btns.accepted.connect(self._on_accept)
        btns.rejected.connect(self.reject)
        btns.clicked[QAbstractButton].connect(self._on_click)
        self._btns = btns
        self.apply_btn.setEnabled(False)

        vbox = QVBoxLayout()
        vbox.addWidget(self.tabs)
        vbox.addWidget(btns)

        self.setLayout(vbox)

    def __init__(self, plotted_lines, *args, **kwargs):
        super().__init__(None, *args, **kwargs)

        self.plotted_lines = plotted_lines

        layout = QVBoxLayout()
        layout.setSizeConstraint(QLayout.SetMaximumSize)
        self.setLayout(layout)

        table_model = LineListTableModel(plotted_lines)
        if table_model.rowCount() > 0:
            table_view = QTableView()

            # disabling sorting will significantly speed up theWidget
            # plot. This is because the table view must be re-built
            # every time a new set of markers is drawn on the plot
            # surface. Alternate approaches are worth examining. It
            # remains to be seen what would be the approach users
            # will favor.

            table_view.setSortingEnabled(False)
            proxy = SortModel(table_model.get_name())
            proxy.setSourceModel(table_model)
            table_view.setModel(proxy)
            table_view.setSortingEnabled(True)

            table_view.setSelectionMode(QAbstractItemView.NoSelection)
            table_view.horizontalHeader().setStretchLastSection(True)
            table_view.resizeColumnsToContents()

            layout.addWidget(table_view)

    def __init__(self, font=None, default_content=None, parent=None):
        """

        :param font: An optional font to override the default editor font
        :param default_content: str, if provided this will populate any new editor that is created
        :param parent: An optional parent widget
        """
        super(MultiPythonFileInterpreter, self).__init__(parent)

        # attributes
        self.default_content = default_content
        self.default_font = font
        self.prev_session_tabs = None
        self.whitespace_visible = False
        self.setAttribute(Qt.WA_DeleteOnClose, True)

        # widget setup
        layout = QVBoxLayout(self)
        self._tabs = CodeEditorTabWidget(self)
        layout.addWidget(self._tabs)
        self.setLayout(layout)
        layout.setContentsMargins(0, 0, 0, 0)

        # add a single editor by default
        self.append_new_editor()

        # setting defaults
        self.confirm_on_save = True

    def __init__(self, rootnode: JsonNode, settings, parent=None):
        super().__init__(parent)
        self.settings = settings
        self.rootnode = rootnode
        self.plotitems = []
        self.starttime = datetime.datetime.now()
        self.dirty = False

        # matplotlib figure
        self.fig = pylab.figure()
        self.canvas = MyCanvas(self.fig, self)
        self.canvas.setParent(self)
        self.ax1 = self.fig.add_subplot(111)
        self.ax1.grid()
        self.ax1.callbacks.connect('xlim_changed', self.plotlim_changed)
        self.ax1.callbacks.connect('ylim_changed', self.plotlim_changed)

        # navigation toolbar
        self.toolbar = NavigationToolbar(self.canvas, self)

        # layout
        layout = QVBoxLayout()
        layout.addWidget(self.toolbar)
        layout.addWidget(self.canvas)
        self.setLayout(layout)

        self.setAcceptDrops(True)

    def __init__(self, parent):
        QWidget.__init__(self, parent)

        vert_layout = QVBoxLayout()

        # Type frame
        type_layout = QHBoxLayout()
        type_label = QLabel(_("Import as"))
        type_layout.addWidget(type_label)

        self.array_btn = array_btn = QRadioButton(_("array"))
        array_btn.setEnabled(ndarray is not FakeObject)
        array_btn.setChecked(ndarray is not FakeObject)
        type_layout.addWidget(array_btn)

        list_btn = QRadioButton(_("list"))
        list_btn.setChecked(not array_btn.isChecked())
        type_layout.addWidget(list_btn)

        if pd:
            self.df_btn = df_btn = QRadioButton(_("DataFrame"))
            df_btn.setChecked(False)
            type_layout.addWidget(df_btn)

        h_spacer = QSpacerItem(40, 20,
                               QSizePolicy.Expanding, QSizePolicy.Minimum)
        type_layout.addItem(h_spacer)
        type_frame = QFrame()
        type_frame.setLayout(type_layout)

        self._table_view = PreviewTable(self)
        vert_layout.addWidget(type_frame)
        vert_layout.addWidget(self._table_view)
        self.setLayout(vert_layout)

class OutputPreviewWidget(QWidget):
    """
    A .py preview widget that appears as a drawer on the side of the main
    import widget.
    """

    def __init__(self, parent=None):
        super(OutputPreviewWidget, self).__init__(parent=parent)
        self.setWindowFlags(Qt.Sheet)
        self.text_editor = QPlainTextEdit()
        self.close_button = QPushButton('Close')
        self.layout = QVBoxLayout()
        self.layout.addWidget(self.text_editor)
        self.layout.addWidget(self.close_button)
        self.setLayout(self.layout)
        self.close_button.clicked.connect(self.hide)
        self.resize(400, 500)
        font = QFont('Courier')
        self.text_editor.setFont(font)
        self.text_editor.setReadOnly(True)

    def set_text(self, text):
        """
        Set the text in the loader preview widget. This will display the text that
        will be saved to the output loader python file.

        Parameters
        ----------
        text: str
            Text that will be saved to the final loader file
        """

        self.text_editor.setPlainText(text)

    def __init__(self, parent=None):
        """Initialization."""
        SpyderPluginWidget.__init__(self, parent)

        self.explorer = ProjectExplorerWidget(
                            self,
                            name_filters=self.get_option('name_filters'),
                            show_all=self.get_option('show_all'),
                            show_hscrollbar=self.get_option('show_hscrollbar'),
                            options_button=self.options_button)

        layout = QVBoxLayout()
        layout.addWidget(self.explorer)
        self.setLayout(layout)

        self.recent_projects = self.get_option('recent_projects', default=[])
        self.current_active_project = None
        self.latest_project = None

        self.editor = None
        self.workingdirectory = None

        # Initialize plugin
        self.initialize_plugin()
        self.explorer.setup_project(self.get_active_project_path())

    def __init__(self, parent, plugin, tabs, data, icon):
        QDialog.__init__(self, parent)

        # Variables
        self.plugins_tabs = []
        self.plugins_data = []
        self.plugins_instances = []
        self.add_plugin(plugin, tabs, data, icon)
        self.plugin = None                # Last plugin with focus
        self.mode = self.FILE_MODE        # By default start in this mode
        self.initial_cursors = None       # {fullpath: QCursor}
        self.initial_path = None          # Fullpath of initial active editor
        self.initial_widget = None        # Initial active editor
        self.line_number = None           # Selected line number in filer
        self.is_visible = False           # Is the switcher visible?

        help_text = _("Press <b>Enter</b> to switch files or <b>Esc</b> to "
                      "cancel.<br><br>Type to filter filenames.<br><br>"
                      "Use <b>:number</b> to go to a line, e.g. "
                      "<b><code>main:42</code></b><br>"
                      "Use <b>@symbol_text</b> to go to a symbol, e.g. "
                      "<b><code>@init</code></b>"
                      "<br><br> Press <b>Ctrl+W</b> to close current tab.<br>")

        # Either allow searching for a line number or a symbol but not both
        regex = QRegExp("([A-Za-z0-9_]{0,100}@[A-Za-z0-9_]{0,100})|" +
                        "([A-Za-z0-9_]{0,100}:{0,1}[0-9]{0,100})")

        # Widgets
        self.edit = FilesFilterLine(self)
        self.help = HelperToolButton()
        self.list = QListWidget(self)
        self.filter = KeyPressFilter()
        regex_validator = QRegExpValidator(regex, self.edit)

        # Widgets setup
        self.setWindowFlags(Qt.Popup | Qt.FramelessWindowHint)
        self.setWindowOpacity(0.95)
        self.edit.installEventFilter(self.filter)
        self.edit.setValidator(regex_validator)
        self.help.setToolTip(help_text)
        self.list.setItemDelegate(HTMLDelegate(self))

        # Layout
        edit_layout = QHBoxLayout()
        edit_layout.addWidget(self.edit)
        edit_layout.addWidget(self.help)
        layout = QVBoxLayout()
        layout.addLayout(edit_layout)
        layout.addWidget(self.list)
        self.setLayout(layout)

        # Signals
        self.rejected.connect(self.restore_initial_state)
        self.filter.sig_up_key_pressed.connect(self.previous_row)
        self.filter.sig_down_key_pressed.connect(self.next_row)
        self.edit.returnPressed.connect(self.accept)
        self.edit.textChanged.connect(self.setup)
        self.list.itemSelectionChanged.connect(self.item_selection_changed)
        self.list.clicked.connect(self.edit.setFocus)

def create_window():
    # Create app and widgets
    app = QApplication(sys.argv)
    win = QMainWindow()
    main_area = QWidget()
    button_area = QWidget()
    scroll_area = QScrollArea()
    button = QPushButton("Start Video")
    btn_grab = QPushButton("Grab Frame")

    # Create layouts
    vbox = QVBoxLayout()
    hbox = QHBoxLayout()

    # Fill Layouts
    vbox.addWidget(scroll_area)
    vbox.addWidget(button_area)
    hbox.addStretch()
    hbox.addWidget(button)
    hbox.addWidget(btn_grab)

    # Assign layouts to widgets
    main_area.setLayout(vbox)
    button_area.setLayout(hbox)
    scroll_area.setLayout(QVBoxLayout())

    # Attach some child widgets directly
    win.setCentralWidget(main_area)

    return app, win, button, btn_grab, scroll_area

    def __init__(self, parent, model):
        super(AlgorithmMonitorDialog, self).__init__(parent)
        self.tree = QTreeWidget(self)
        self.tree.setColumnCount(3)
        self.tree.setSelectionMode(QTreeWidget.NoSelection)
        self.tree.setColumnWidth(0, 220)
        self.tree.setHeaderLabels(['Algorithm', 'Progress', ''])
        header = self.tree.header()
        header.setSectionResizeMode(1, QHeaderView.Stretch)
        header.setSectionResizeMode(2, QHeaderView.Fixed)
        header.setStretchLastSection(False)

        button_layout = QHBoxLayout()
        self.close_button = QPushButton('Close')
        button_layout.addStretch()
        button_layout.addWidget(self.close_button)

        layout = QVBoxLayout()
        layout.addWidget(self.tree)
        layout.addLayout(button_layout)
        self.setLayout(layout)

        self.setWindowTitle('Mantid - Algorithm progress')
        self.setWindowIcon(QIcon(":/MantidPlot_Icon_32offset.png"))
        self.resize(500, 300)

        self.presenter = AlgorithmProgressDialogPresenter(self, model)
        self.presenter.update_gui()

    def __init__(self, parent=None):
        QDialog.__init__(self, parent)

        self.main = parent

        # Widgets
        self.pages_widget = QStackedWidget()
        self.pages_widget.setMinimumWidth(600)
        self.contents_widget = QListWidget()
        self.button_reset = QPushButton(_('Reset to defaults'))

        bbox = QDialogButtonBox(QDialogButtonBox.Ok | QDialogButtonBox.Apply |
                                QDialogButtonBox.Cancel)
        self.apply_btn = bbox.button(QDialogButtonBox.Apply)

        # Widgets setup
        # Destroying the C++ object right after closing the dialog box,
        # otherwise it may be garbage-collected in another QThread
        # (e.g. the editor's analysis thread in Spyder), thus leading to
        # a segmentation fault on UNIX or an application crash on Windows
        self.setAttribute(Qt.WA_DeleteOnClose)
        self.setWindowTitle(_('Preferences'))
        self.setWindowIcon(ima.icon('configure'))
        self.contents_widget.setMovement(QListView.Static)
        self.contents_widget.setSpacing(1)
        self.contents_widget.setCurrentRow(0)
        self.contents_widget.setMinimumWidth(220)
        self.contents_widget.setMinimumHeight(400)

        # Layout
        hsplitter = QSplitter()
        hsplitter.addWidget(self.contents_widget)
        hsplitter.addWidget(self.pages_widget)
        hsplitter.setStretchFactor(0, 1)
        hsplitter.setStretchFactor(1, 2)

        btnlayout = QHBoxLayout()
        btnlayout.addWidget(self.button_reset)
        btnlayout.addStretch(1)
        btnlayout.addWidget(bbox)

        vlayout = QVBoxLayout()
        vlayout.addWidget(hsplitter)
        vlayout.addLayout(btnlayout)

        self.setLayout(vlayout)

        # Signals and slots
        if self.main:
            self.button_reset.clicked.connect(self.main.reset_spyder)
        self.pages_widget.currentChanged.connect(self.current_page_changed)
        self.contents_widget.currentRowChanged.connect(
                                             self.pages_widget.setCurrentIndex)
        bbox.accepted.connect(self.accept)
        bbox.rejected.connect(self.reject)
        bbox.clicked.connect(self.button_clicked)

        # Ensures that the config is present on spyder first run
        CONF.set('main', 'interface_language', load_lang_conf())

 def __init__(self, editor_stack):
     """Main Window Mock constructor."""
     QWidget.__init__(self, None)
     self.plugin_focus_changed = Mock()
     self.editor = EditorMock(editor_stack)
     layout = QVBoxLayout()
     layout.addWidget(self.editor)
     self.setLayout(layout)