Python QtWidgets.QStackedWidget类代码示例

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

        self.data = None
        self.input_vars = ()
        self._invalidated = False

        box = gui.vBox(self.controlArea, "Domain Features")

        self.domain_model = itemmodels.VariableListModel()
        self.domain_view = QListView(
            selectionMode=QListView.SingleSelection
        )
        self.domain_view.setModel(self.domain_model)
        self.domain_view.selectionModel().selectionChanged.connect(
            self._on_selection_changed)
        box.layout().addWidget(self.domain_view)

        box = gui.hBox(self.controlArea)
        gui.button(box, self, "Reset Selected", callback=self.reset_selected)
        gui.button(box, self, "Reset All", callback=self.reset_all)

        gui.auto_commit(self.controlArea, self, "autocommit", "Apply")

        box = gui.vBox(self.mainArea, "Edit")
        self.editor_stack = QStackedWidget()

        self.editor_stack.addWidget(DiscreteVariableEditor())
        self.editor_stack.addWidget(ContinuousVariableEditor())
        self.editor_stack.addWidget(VariableEditor())

        box.layout().addWidget(self.editor_stack)

    def __init__(self):
        super().__init__()
        self.measure_scores = None
        self.update_scores = True
        self.usefulAttributes = []
        self.learners = {}
        self.labels = []
        self.out_domain_desc = None

        self.all_measures = SCORES

        self.selectedMeasures = dict([(m.name, True) for m
                                      in self.all_measures])
        # Discrete (0) or continuous (1) class mode
        self.rankMode = 0

        self.data = None

        self.discMeasures = [m for m in self.all_measures if
                             issubclass(DiscreteVariable, m.score.class_type)]
        self.contMeasures = [m for m in self.all_measures if
                             issubclass(ContinuousVariable, m.score.class_type)]

        self.score_checks = []
        self.cls_scoring_box = gui.vBox(None, "Scoring for Classification")
        self.reg_scoring_box = gui.vBox(None, "Scoring for Regression")
        boxes = [self.cls_scoring_box] * 7 + [self.reg_scoring_box] * 2
        for _score, var, box in zip(SCORES, self._score_vars, boxes):
            check = gui.checkBox(
                box, self, var, label=_score.name,
                callback=lambda val=_score: self.measuresSelectionChanged(val))
            self.score_checks.append(check)

        self.score_stack = QStackedWidget(self)
        self.score_stack.addWidget(self.cls_scoring_box)
        self.score_stack.addWidget(self.reg_scoring_box)
        self.score_stack.addWidget(QWidget())
        self.controlArea.layout().addWidget(self.score_stack)

        gui.rubber(self.controlArea)

        selMethBox = gui.vBox(
                self.controlArea, "Select Attributes", addSpace=True)

        grid = QGridLayout()
        grid.setContentsMargins(6, 0, 6, 0)
        self.selectButtons = QButtonGroup()
        self.selectButtons.buttonClicked[int].connect(self.setSelectMethod)

        def button(text, buttonid, toolTip=None):
            b = QRadioButton(text)
            self.selectButtons.addButton(b, buttonid)
            if toolTip is not None:
                b.setToolTip(toolTip)
            return b

        b1 = button(self.tr("None"), OWRank.SelectNone)
        b2 = button(self.tr("All"), OWRank.SelectAll)
        b3 = button(self.tr("Manual"), OWRank.SelectManual)
        b4 = button(self.tr("Best ranked:"), OWRank.SelectNBest)

        s = gui.spin(selMethBox, self, "nSelected", 1, 100,
                     callback=self.nSelectedChanged)

        grid.addWidget(b1, 0, 0)
        grid.addWidget(b2, 1, 0)
        grid.addWidget(b3, 2, 0)
        grid.addWidget(b4, 3, 0)
        grid.addWidget(s, 3, 1)

        self.selectButtons.button(self.selectMethod).setChecked(True)

        selMethBox.layout().addLayout(grid)

        gui.auto_commit(selMethBox, self, "auto_apply", "Send", box=False)

        # Discrete, continuous and no_class table views are stacked
        self.ranksViewStack = QStackedLayout()
        self.mainArea.layout().addLayout(self.ranksViewStack)

        self.discRanksView = QTableView()
        self.ranksViewStack.addWidget(self.discRanksView)
        self.discRanksView.setSelectionBehavior(QTableView.SelectRows)
        self.discRanksView.setSelectionMode(QTableView.MultiSelection)
        self.discRanksView.setSortingEnabled(True)

        self.discRanksLabels = ["#"] + [m.shortname for m in self.discMeasures]
        self.discRanksModel = QStandardItemModel(self)
        self.discRanksModel.setHorizontalHeaderLabels(self.discRanksLabels)

        self.discRanksProxyModel = MySortProxyModel(self)
        self.discRanksProxyModel.setSourceModel(self.discRanksModel)
        self.discRanksView.setModel(self.discRanksProxyModel)

        self.discRanksView.setColumnWidth(0, 20)
        self.discRanksView.selectionModel().selectionChanged.connect(
            self.commit
        )
        self.discRanksView.pressed.connect(self.onSelectItem)
        self.discRanksView.horizontalHeader().sectionClicked.connect(
#.........这里部分代码省略.........

class OWEditDomain(widget.OWWidget):
    name = "Edit Domain"
    description = "Rename features and their values."
    icon = "icons/EditDomain.svg"
    priority = 3125

    inputs = [("Data", Orange.data.Table, "set_data")]
    outputs = [("Data", Orange.data.Table)]

    settingsHandler = settings.DomainContextHandler()

    domain_change_hints = settings.ContextSetting({})
    selected_index = settings.ContextSetting({})

    autocommit = settings.Setting(False)

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

        self.data = None
        self.input_vars = ()
        self._invalidated = False

        box = gui.vBox(self.controlArea, "Domain Features")

        self.domain_model = itemmodels.VariableListModel()
        self.domain_view = QListView(
            selectionMode=QListView.SingleSelection
        )
        self.domain_view.setModel(self.domain_model)
        self.domain_view.selectionModel().selectionChanged.connect(
            self._on_selection_changed)
        box.layout().addWidget(self.domain_view)

        box = gui.hBox(self.controlArea)
        gui.button(box, self, "Reset Selected", callback=self.reset_selected)
        gui.button(box, self, "Reset All", callback=self.reset_all)

        gui.auto_commit(self.controlArea, self, "autocommit", "Apply")

        box = gui.vBox(self.mainArea, "Edit")
        self.editor_stack = QStackedWidget()

        self.editor_stack.addWidget(DiscreteVariableEditor())
        self.editor_stack.addWidget(ContinuousVariableEditor())
        self.editor_stack.addWidget(VariableEditor())

        box.layout().addWidget(self.editor_stack)

    @check_sql_input
    def set_data(self, data):
        """Set input data set."""
        self.closeContext()
        self.clear()
        self.data = data

        if self.data is not None:
            self._initialize()
            self.openContext(self.data)
            self._restore()

        self.unconditional_commit()

    def clear(self):
        """Clear the widget state."""
        self.data = None
        self.domain_model[:] = []
        self.input_vars = []
        self.domain_change_hints = {}
        self.selected_index = -1

    def reset_selected(self):
        """Reset the currently selected variable to its original state."""
        ind = self.selected_var_index()
        if ind >= 0:
            var = self.input_vars[ind]
            desc = variable_description(var, skip_attributes=True)
            if desc in self.domain_change_hints:
                del self.domain_change_hints[desc]

            self.domain_model[ind] = var
            self.editor_stack.currentWidget().set_data(var)
            self._invalidate()

    def reset_all(self):
        """Reset all variables to their original state."""
        self.domain_change_hints = {}
        if self.data is not None:
            # To invalidate stored hints
            self.domain_model[:] = self.input_vars
            itemmodels.select_row(self.domain_view, self.selected_index)
            self._invalidate()

    def selected_var_index(self):
        """Return the selected row in 'Domain Features' view."""
        rows = self.domain_view.selectedIndexes()
        assert len(rows) <= 1
        return rows[0].row() if rows else -1

    def _initialize(self):
#.........这里部分代码省略.........

    def __setupUi(self):
        """Set up the UI.
        """
        if self.__macUnified:
            self.tab = QToolBar()

            self.addToolBar(Qt.TopToolBarArea, self.tab)
            self.setUnifiedTitleAndToolBarOnMac(True)

            # This does not seem to work
            self.setWindowFlags(self.windowFlags() & \
                                ~Qt.MacWindowToolBarButtonHint)

            self.tab.actionTriggered[QAction].connect(
                self.__macOnToolBarAction
            )

            central = QStackedWidget()

            central.setSizePolicy(QSizePolicy.Fixed, QSizePolicy.Fixed)
        else:
            self.tab = central = QTabWidget(self)

        self.stack = central

        self.setCentralWidget(central)

        # General Tab
        tab = QWidget()
        self.addTab(tab, self.tr("General"),
                    toolTip=self.tr("General Options"))

        form = QFormLayout()
        tab.setSizePolicy(QSizePolicy.Fixed, QSizePolicy.Fixed)

        nodes = QWidget(self, objectName="nodes")
        nodes.setLayout(QVBoxLayout())
        nodes.layout().setContentsMargins(0, 0, 0, 0)

        cb_anim = QCheckBox(
            self.tr("Enable node animations"),
            objectName="enable-node-animations",
            toolTip=self.tr("Enable shadow and ping animations for nodes "
                            "in the workflow.")
        )
        self.bind(cb_anim, "checked", "schemeedit/enable-node-animations")
        nodes.layout().addWidget(cb_anim)

        form.addRow(self.tr("Nodes"), nodes)

        links = QWidget(self, objectName="links")
        links.setLayout(QVBoxLayout())
        links.layout().setContentsMargins(0, 0, 0, 0)

        cb_show = QCheckBox(
            self.tr("Show channel names between widgets"),
            objectName="show-channel-names",
            toolTip=self.tr("Show source and sink channel names "
                            "over the links.")
        )

        self.bind(cb_show, "checked", "schemeedit/show-channel-names")

        links.layout().addWidget(cb_show)

        form.addRow(self.tr("Links"), links)

        quickmenu = QWidget(self, objectName="quickmenu-options")
        quickmenu.setLayout(QVBoxLayout())
        quickmenu.layout().setContentsMargins(0, 0, 0, 0)

        cb1 = QCheckBox(self.tr("On double click"),
                        toolTip=self.tr("Open quick menu on a double click "
                                        "on an empty spot in the canvas"))

        cb2 = QCheckBox(self.tr("On right click"),
                        toolTip=self.tr("Open quick menu on a right click "
                                        "on an empty spot in the canvas"))

        cb3 = QCheckBox(self.tr("On space key press"),
                        toolTip=self.tr("On Space key press while the mouse"
                                        "is hovering over the canvas."))

        cb4 = QCheckBox(self.tr("On any key press"),
                        toolTip=self.tr("On any key press while the mouse"
                                        "is hovering over the canvas."))

        self.bind(cb1, "checked", "quickmenu/trigger-on-double-click")
        self.bind(cb2, "checked", "quickmenu/trigger-on-right-click")
        self.bind(cb3, "checked", "quickmenu/trigger-on-space-key")
        self.bind(cb4, "checked", "quickmenu/trigger-on-any-key")

        quickmenu.layout().addWidget(cb1)
        quickmenu.layout().addWidget(cb2)
        quickmenu.layout().addWidget(cb3)
        quickmenu.layout().addWidget(cb4)

        form.addRow(self.tr("Open quick menu on"), quickmenu)

        startup = QWidget(self, objectName="startup-group")
#.........这里部分代码省略.........

class OWRank(OWWidget):
    name = "Rank"
    description = "Rank and filter data features by their relevance."
    icon = "icons/Rank.svg"
    priority = 1102

    buttons_area_orientation = Qt.Vertical

    inputs = [("Data", Table, "setData"),
              ("Scorer", score.Scorer, "set_learner", widget.Multiple)]
    outputs = [("Reduced Data", Table, widget.Default), ("Scores", Table)]

    SelectNone, SelectAll, SelectManual, SelectNBest = range(4)

    cls_default_selected = Setting({"Gain Ratio", "Gini Decrease"})
    reg_default_selected = Setting({"Univariate Linear Regression", "RReliefF"})
    selectMethod = Setting(SelectNBest)
    nSelected = Setting(5)
    auto_apply = Setting(True)

    # Header state for discrete/continuous/no_class scores
    headerState = Setting([None, None, None])

    settings_version = 1
    settingsHandler = DomainContextHandler()
    selected_rows = ContextSetting([])

    gain = inf_gain = gini = anova = chi2 = ulr = relief = rrelief = fcbc = True
    _score_vars = ["gain", "inf_gain", "gini", "anova", "chi2", "relief",
                   "fcbc", "ulr", "rrelief"]

    class Warning(OWWidget.Warning):
        no_target_var = Msg("Data does not have a target variable")

    class Error(OWWidget.Error):
        invalid_type = Msg("Cannot handle target variable type {}")
        inadequate_learner = Msg("{}")

    def __init__(self):
        super().__init__()
        self.measure_scores = None
        self.update_scores = True
        self.usefulAttributes = []
        self.learners = {}
        self.labels = []
        self.out_domain_desc = None

        self.all_measures = SCORES

        self.selectedMeasures = dict([(m.name, True) for m
                                      in self.all_measures])
        # Discrete (0) or continuous (1) class mode
        self.rankMode = 0

        self.data = None

        self.discMeasures = [m for m in self.all_measures if
                             issubclass(DiscreteVariable, m.score.class_type)]
        self.contMeasures = [m for m in self.all_measures if
                             issubclass(ContinuousVariable, m.score.class_type)]

        self.score_checks = []
        self.cls_scoring_box = gui.vBox(None, "Scoring for Classification")
        self.reg_scoring_box = gui.vBox(None, "Scoring for Regression")
        boxes = [self.cls_scoring_box] * 7 + [self.reg_scoring_box] * 2
        for _score, var, box in zip(SCORES, self._score_vars, boxes):
            check = gui.checkBox(
                box, self, var, label=_score.name,
                callback=lambda val=_score: self.measuresSelectionChanged(val))
            self.score_checks.append(check)

        self.score_stack = QStackedWidget(self)
        self.score_stack.addWidget(self.cls_scoring_box)
        self.score_stack.addWidget(self.reg_scoring_box)
        self.score_stack.addWidget(QWidget())
        self.controlArea.layout().addWidget(self.score_stack)

        gui.rubber(self.controlArea)

        selMethBox = gui.vBox(
                self.controlArea, "Select Attributes", addSpace=True)

        grid = QGridLayout()
        grid.setContentsMargins(6, 0, 6, 0)
        self.selectButtons = QButtonGroup()
        self.selectButtons.buttonClicked[int].connect(self.setSelectMethod)

        def button(text, buttonid, toolTip=None):
            b = QRadioButton(text)
            self.selectButtons.addButton(b, buttonid)
            if toolTip is not None:
                b.setToolTip(toolTip)
            return b

        b1 = button(self.tr("None"), OWRank.SelectNone)
        b2 = button(self.tr("All"), OWRank.SelectAll)
        b3 = button(self.tr("Manual"), OWRank.SelectManual)
        b4 = button(self.tr("Best ranked:"), OWRank.SelectNBest)

        s = gui.spin(selMethBox, self, "nSelected", 1, 100,
#.........这里部分代码省略.........

class OWFeatureConstructor(OWWidget):
    name = "Feature Constructor"
    description = "Construct new features (data columns) from a set of " \
                  "existing features in the input data set."
    icon = "icons/FeatureConstructor.svg"

    class Inputs:
        data = Input("Data", Orange.data.Table)

    class Outputs:
        data = Output("Data", Orange.data.Table)

    want_main_area = False

    settingsHandler = FeatureConstructorHandler()
    descriptors = ContextSetting([])
    currentIndex = ContextSetting(-1)

    EDITORS = [
        (ContinuousDescriptor, ContinuousFeatureEditor),
        (DiscreteDescriptor, DiscreteFeatureEditor),
        (StringDescriptor, StringFeatureEditor)
    ]

    class Error(OWWidget.Error):
        more_values_needed = Msg("Categorical feature {} needs more values.")
        invalid_expressions = Msg("Invalid expressions: {}.")

    def __init__(self):
        super().__init__()
        self.data = None
        self.editors = {}

        box = gui.vBox(self.controlArea, "Variable Definitions")

        toplayout = QHBoxLayout()
        toplayout.setContentsMargins(0, 0, 0, 0)
        box.layout().addLayout(toplayout)

        self.editorstack = QStackedWidget(
            sizePolicy=QSizePolicy(QSizePolicy.MinimumExpanding,
                                   QSizePolicy.MinimumExpanding)
        )

        for descclass, editorclass in self.EDITORS:
            editor = editorclass()
            editor.featureChanged.connect(self._on_modified)
            self.editors[descclass] = editor
            self.editorstack.addWidget(editor)

        self.editorstack.setEnabled(False)

        buttonlayout = QVBoxLayout(spacing=10)
        buttonlayout.setContentsMargins(0, 0, 0, 0)

        self.addbutton = QPushButton(
            "New", toolTip="Create a new variable",
            minimumWidth=120,
            shortcut=QKeySequence.New
        )

        def unique_name(fmt, reserved):
            candidates = (fmt.format(i) for i in count(1))
            return next(c for c in candidates if c not in reserved)

        def reserved_names():
            varnames = []
            if self.data is not None:
                varnames = [var.name for var in
                            self.data.domain.variables + self.data.domain.metas]
            varnames += [desc.name for desc in self.featuremodel]
            return set(varnames)

        def generate_newname(fmt):
            return unique_name(fmt, reserved_names())

        menu = QMenu(self.addbutton)
        cont = menu.addAction("Numeric")
        cont.triggered.connect(
            lambda: self.addFeature(
                ContinuousDescriptor(generate_newname("X{}"), "", 3))
        )
        disc = menu.addAction("Categorical")
        disc.triggered.connect(
            lambda: self.addFeature(
                DiscreteDescriptor(generate_newname("D{}"), "",
                                   ("A", "B"), -1, False))
        )
        string = menu.addAction("Text")
        string.triggered.connect(
            lambda: self.addFeature(
                StringDescriptor(generate_newname("S{}"), ""))
        )
        menu.addSeparator()
        self.duplicateaction = menu.addAction("Duplicate Selected Variable")
        self.duplicateaction.triggered.connect(self.duplicateFeature)
        self.duplicateaction.setEnabled(False)
        self.addbutton.setMenu(menu)

        self.removebutton = QPushButton(
#.........这里部分代码省略.........

    def __init__(self):
        super().__init__()
        self.data = None
        self.editors = {}

        box = gui.vBox(self.controlArea, "Variable Definitions")

        toplayout = QHBoxLayout()
        toplayout.setContentsMargins(0, 0, 0, 0)
        box.layout().addLayout(toplayout)

        self.editorstack = QStackedWidget(
            sizePolicy=QSizePolicy(QSizePolicy.MinimumExpanding,
                                   QSizePolicy.MinimumExpanding)
        )

        for descclass, editorclass in self.EDITORS:
            editor = editorclass()
            editor.featureChanged.connect(self._on_modified)
            self.editors[descclass] = editor
            self.editorstack.addWidget(editor)

        self.editorstack.setEnabled(False)

        buttonlayout = QVBoxLayout(spacing=10)
        buttonlayout.setContentsMargins(0, 0, 0, 0)

        self.addbutton = QPushButton(
            "New", toolTip="Create a new variable",
            minimumWidth=120,
            shortcut=QKeySequence.New
        )

        def unique_name(fmt, reserved):
            candidates = (fmt.format(i) for i in count(1))
            return next(c for c in candidates if c not in reserved)

        def reserved_names():
            varnames = []
            if self.data is not None:
                varnames = [var.name for var in
                            self.data.domain.variables + self.data.domain.metas]
            varnames += [desc.name for desc in self.featuremodel]
            return set(varnames)

        def generate_newname(fmt):
            return unique_name(fmt, reserved_names())

        menu = QMenu(self.addbutton)
        cont = menu.addAction("Numeric")
        cont.triggered.connect(
            lambda: self.addFeature(
                ContinuousDescriptor(generate_newname("X{}"), "", 3))
        )
        disc = menu.addAction("Categorical")
        disc.triggered.connect(
            lambda: self.addFeature(
                DiscreteDescriptor(generate_newname("D{}"), "",
                                   ("A", "B"), -1, False))
        )
        string = menu.addAction("Text")
        string.triggered.connect(
            lambda: self.addFeature(
                StringDescriptor(generate_newname("S{}"), ""))
        )
        menu.addSeparator()
        self.duplicateaction = menu.addAction("Duplicate Selected Variable")
        self.duplicateaction.triggered.connect(self.duplicateFeature)
        self.duplicateaction.setEnabled(False)
        self.addbutton.setMenu(menu)

        self.removebutton = QPushButton(
            "Remove", toolTip="Remove selected variable",
            minimumWidth=120,
            shortcut=QKeySequence.Delete
        )
        self.removebutton.clicked.connect(self.removeSelectedFeature)

        buttonlayout.addWidget(self.addbutton)
        buttonlayout.addWidget(self.removebutton)
        buttonlayout.addStretch(10)

        toplayout.addLayout(buttonlayout, 0)
        toplayout.addWidget(self.editorstack, 10)

        # Layout for the list view
        layout = QVBoxLayout(spacing=1, margin=0)
        self.featuremodel = DescriptorModel(parent=self)

        self.featureview = QListView(
            minimumWidth=200,
            sizePolicy=QSizePolicy(QSizePolicy.Minimum,
                                   QSizePolicy.MinimumExpanding)
        )

        self.featureview.setItemDelegate(FeatureItemDelegate(self))
        self.featureview.setModel(self.featuremodel)
        self.featureview.selectionModel().selectionChanged.connect(
            self._on_selectedVariableChanged
        )
#.........这里部分代码省略.........

    def __init__(self):
        super().__init__()
        self.data = None  # type: Optional[Orange.data.Table]
        #: The current selected variable index
        self.selected_index = -1
        self._invalidated = False

        mainlayout = self.mainArea.layout()
        assert isinstance(mainlayout, QVBoxLayout)
        layout = QHBoxLayout()
        mainlayout.addLayout(layout)
        box = QGroupBox("Variables")
        box.setLayout(QVBoxLayout())
        layout.addWidget(box)

        self.variables_model = VariableListModel(parent=self)
        self.variables_view = self.domain_view = QListView(
            selectionMode=QListView.SingleSelection,
            uniformItemSizes=True,
        )
        self.variables_view.setItemDelegate(VariableEditDelegate(self))
        self.variables_view.setModel(self.variables_model)
        self.variables_view.selectionModel().selectionChanged.connect(
            self._on_selection_changed
        )
        box.layout().addWidget(self.variables_view)

        box = QGroupBox("Edit", )
        box.setLayout(QVBoxLayout(margin=4))
        layout.addWidget(box)

        self.editor_stack = QStackedWidget()

        self.editor_stack.addWidget(DiscreteVariableEditor())
        self.editor_stack.addWidget(ContinuousVariableEditor())
        self.editor_stack.addWidget(TimeVariableEditor())
        self.editor_stack.addWidget(VariableEditor())

        box.layout().addWidget(self.editor_stack)

        bbox = QDialogButtonBox()
        bbox.setStyleSheet(
            "button-layout: {:d};".format(QDialogButtonBox.MacLayout))
        bapply = QPushButton(
            "Apply",
            objectName="button-apply",
            toolTip="Apply changes and commit data on output.",
            default=True,
            autoDefault=False
        )
        bapply.clicked.connect(self.commit)
        breset = QPushButton(
            "Reset Selected",
            objectName="button-reset",
            toolTip="Rest selected variable to its input state.",
            autoDefault=False
        )
        breset.clicked.connect(self.reset_selected)
        breset_all = QPushButton(
            "Reset All",
            objectName="button-reset-all",
            toolTip="Reset all variables to their input state.",
            autoDefault=False
        )
        breset_all.clicked.connect(self.reset_all)

        bbox.addButton(bapply, QDialogButtonBox.AcceptRole)
        bbox.addButton(breset, QDialogButtonBox.ResetRole)
        bbox.addButton(breset_all, QDialogButtonBox.ResetRole)

        mainlayout.addWidget(bbox)
        self.variables_view.setFocus(Qt.NoFocusReason)  # initial focus

class OWEditDomain(widget.OWWidget):
    name = "Edit Domain"
    description = "Rename variables, edit categories and variable annotations."
    icon = "icons/EditDomain.svg"
    priority = 3125
    keywords = []

    class Inputs:
        data = Input("Data", Orange.data.Table)

    class Outputs:
        data = Output("Data", Orange.data.Table)

    class Error(widget.OWWidget.Error):
        duplicate_var_name = widget.Msg("A variable name is duplicated.")

    settingsHandler = settings.DomainContextHandler()
    settings_version = 2

    _domain_change_store = settings.ContextSetting({})
    _selected_item = settings.ContextSetting(None)  # type: Optional[str]

    want_control_area = False

    def __init__(self):
        super().__init__()
        self.data = None  # type: Optional[Orange.data.Table]
        #: The current selected variable index
        self.selected_index = -1
        self._invalidated = False

        mainlayout = self.mainArea.layout()
        assert isinstance(mainlayout, QVBoxLayout)
        layout = QHBoxLayout()
        mainlayout.addLayout(layout)
        box = QGroupBox("Variables")
        box.setLayout(QVBoxLayout())
        layout.addWidget(box)

        self.variables_model = VariableListModel(parent=self)
        self.variables_view = self.domain_view = QListView(
            selectionMode=QListView.SingleSelection,
            uniformItemSizes=True,
        )
        self.variables_view.setItemDelegate(VariableEditDelegate(self))
        self.variables_view.setModel(self.variables_model)
        self.variables_view.selectionModel().selectionChanged.connect(
            self._on_selection_changed
        )
        box.layout().addWidget(self.variables_view)

        box = QGroupBox("Edit", )
        box.setLayout(QVBoxLayout(margin=4))
        layout.addWidget(box)

        self.editor_stack = QStackedWidget()

        self.editor_stack.addWidget(DiscreteVariableEditor())
        self.editor_stack.addWidget(ContinuousVariableEditor())
        self.editor_stack.addWidget(TimeVariableEditor())
        self.editor_stack.addWidget(VariableEditor())

        box.layout().addWidget(self.editor_stack)

        bbox = QDialogButtonBox()
        bbox.setStyleSheet(
            "button-layout: {:d};".format(QDialogButtonBox.MacLayout))
        bapply = QPushButton(
            "Apply",
            objectName="button-apply",
            toolTip="Apply changes and commit data on output.",
            default=True,
            autoDefault=False
        )
        bapply.clicked.connect(self.commit)
        breset = QPushButton(
            "Reset Selected",
            objectName="button-reset",
            toolTip="Rest selected variable to its input state.",
            autoDefault=False
        )
        breset.clicked.connect(self.reset_selected)
        breset_all = QPushButton(
            "Reset All",
            objectName="button-reset-all",
            toolTip="Reset all variables to their input state.",
            autoDefault=False
        )
        breset_all.clicked.connect(self.reset_all)

        bbox.addButton(bapply, QDialogButtonBox.AcceptRole)
        bbox.addButton(breset, QDialogButtonBox.ResetRole)
        bbox.addButton(breset_all, QDialogButtonBox.ResetRole)

        mainlayout.addWidget(bbox)
        self.variables_view.setFocus(Qt.NoFocusReason)  # initial focus

    @Inputs.data
    def set_data(self, data):
        """Set input dataset."""
#.........这里部分代码省略.........

class OWImportImages(widget.OWWidget):
    name = "Import Images"
    description = "Import images from a directory(s)"
    icon = "icons/ImportImages.svg"
    priority = 110

    outputs = [("Data", Orange.data.Table)]

    #: list of recent paths
    recent_paths = settings.Setting([])  # type: List[RecentPath]

    want_main_area = False
    resizing_enabled = False

    Modality = Qt.ApplicationModal
    # Modality = Qt.WindowModal

    MaxRecentItems = 20

    def __init__(self):
        super().__init__()
        #: widget's runtime state
        self.__state = State.NoState
        self.data = None
        self._n_image_categories = 0
        self._n_image_data = 0
        self._n_skipped = 0

        self.__invalidated = False
        self.__pendingTask = None

        vbox = gui.vBox(self.controlArea)
        hbox = gui.hBox(vbox)
        self.recent_cb = QComboBox(
            sizeAdjustPolicy=QComboBox.AdjustToMinimumContentsLengthWithIcon,
            minimumContentsLength=16,
            acceptDrops=True
        )
        self.recent_cb.installEventFilter(self)
        self.recent_cb.activated[int].connect(self.__onRecentActivated)
        icons = standard_icons(self)

        browseaction = QAction(
            "Open/Load Images", self,
            iconText="\N{HORIZONTAL ELLIPSIS}",
            icon=icons.dir_open_icon,
            toolTip="Select a directory from which to load the images"
        )
        browseaction.triggered.connect(self.__runOpenDialog)
        reloadaction = QAction(
            "Reload", self,
            icon=icons.reload_icon,
            toolTip="Reload current image set"
        )
        reloadaction.triggered.connect(self.reload)
        self.__actions = namespace(
            browse=browseaction,
            reload=reloadaction,
        )

        browsebutton = QPushButton(
            browseaction.iconText(),
            icon=browseaction.icon(),
            toolTip=browseaction.toolTip(),
            clicked=browseaction.trigger
        )
        reloadbutton = QPushButton(
            reloadaction.iconText(),
            icon=reloadaction.icon(),
            clicked=reloadaction.trigger,
            default=True,
        )

        hbox.layout().addWidget(self.recent_cb)
        hbox.layout().addWidget(browsebutton)
        hbox.layout().addWidget(reloadbutton)

        self.addActions([browseaction, reloadaction])

        reloadaction.changed.connect(
            lambda: reloadbutton.setEnabled(reloadaction.isEnabled())
        )
        box = gui.vBox(vbox, "Info")
        self.infostack = QStackedWidget()

        self.info_area = QLabel(
            text="No image set selected",
            wordWrap=True
        )
        self.progress_widget = QProgressBar(
            minimum=0, maximum=0
        )
        self.cancel_button = QPushButton(
            "Cancel", icon=icons.cancel_icon,
        )
        self.cancel_button.clicked.connect(self.cancel)

        w = QWidget()
        vlayout = QVBoxLayout()
        vlayout.setContentsMargins(0, 0, 0, 0)
#.........这里部分代码省略.........

    def __init__(self):
        super().__init__()
        #: widget's runtime state
        self.__state = State.NoState
        self.data = None
        self._n_image_categories = 0
        self._n_image_data = 0
        self._n_skipped = 0

        self.__invalidated = False
        self.__pendingTask = None

        vbox = gui.vBox(self.controlArea)
        hbox = gui.hBox(vbox)
        self.recent_cb = QComboBox(
            sizeAdjustPolicy=QComboBox.AdjustToMinimumContentsLengthWithIcon,
            minimumContentsLength=16,
            acceptDrops=True
        )
        self.recent_cb.installEventFilter(self)
        self.recent_cb.activated[int].connect(self.__onRecentActivated)
        icons = standard_icons(self)

        browseaction = QAction(
            "Open/Load Images", self,
            iconText="\N{HORIZONTAL ELLIPSIS}",
            icon=icons.dir_open_icon,
            toolTip="Select a directory from which to load the images"
        )
        browseaction.triggered.connect(self.__runOpenDialog)
        reloadaction = QAction(
            "Reload", self,
            icon=icons.reload_icon,
            toolTip="Reload current image set"
        )
        reloadaction.triggered.connect(self.reload)
        self.__actions = namespace(
            browse=browseaction,
            reload=reloadaction,
        )

        browsebutton = QPushButton(
            browseaction.iconText(),
            icon=browseaction.icon(),
            toolTip=browseaction.toolTip(),
            clicked=browseaction.trigger
        )
        reloadbutton = QPushButton(
            reloadaction.iconText(),
            icon=reloadaction.icon(),
            clicked=reloadaction.trigger,
            default=True,
        )

        hbox.layout().addWidget(self.recent_cb)
        hbox.layout().addWidget(browsebutton)
        hbox.layout().addWidget(reloadbutton)

        self.addActions([browseaction, reloadaction])

        reloadaction.changed.connect(
            lambda: reloadbutton.setEnabled(reloadaction.isEnabled())
        )
        box = gui.vBox(vbox, "Info")
        self.infostack = QStackedWidget()

        self.info_area = QLabel(
            text="No image set selected",
            wordWrap=True
        )
        self.progress_widget = QProgressBar(
            minimum=0, maximum=0
        )
        self.cancel_button = QPushButton(
            "Cancel", icon=icons.cancel_icon,
        )
        self.cancel_button.clicked.connect(self.cancel)

        w = QWidget()
        vlayout = QVBoxLayout()
        vlayout.setContentsMargins(0, 0, 0, 0)
        hlayout = QHBoxLayout()
        hlayout.setContentsMargins(0, 0, 0, 0)

        hlayout.addWidget(self.progress_widget)
        hlayout.addWidget(self.cancel_button)
        vlayout.addLayout(hlayout)

        self.pathlabel = TextLabel()
        self.pathlabel.setTextElideMode(Qt.ElideMiddle)
        self.pathlabel.setAttribute(Qt.WA_MacSmallSize)

        vlayout.addWidget(self.pathlabel)
        w.setLayout(vlayout)

        self.infostack.addWidget(self.info_area)
        self.infostack.addWidget(w)

        box.layout().addWidget(self.infostack)

#.........这里部分代码省略.........

    def __setupUi(self):
        """Set up the UI.
        """
        if self.__macUnified:
            self.tab = QToolBar(
                floatable=False, movable=False, allowedAreas=Qt.TopToolBarArea,
            )
            self.addToolBar(Qt.TopToolBarArea, self.tab)
            self.setUnifiedTitleAndToolBarOnMac(True)

            # This does not seem to work
            self.setWindowFlags(self.windowFlags() & \
                                ~Qt.MacWindowToolBarButtonHint)

            self.tab.actionTriggered[QAction].connect(
                self.__macOnToolBarAction
            )

            central = QStackedWidget()

            central.setSizePolicy(QSizePolicy.Fixed, QSizePolicy.Fixed)
        else:
            self.tab = central = QTabWidget(self)

        # Add a close button to the bottom of the dialog
        # (to satisfy GNOME 3 which shows the dialog  without a title bar).
        container = container_widget_helper()
        container.layout().addWidget(central)
        buttonbox = QDialogButtonBox(QDialogButtonBox.Close)
        buttonbox.rejected.connect(self.close)
        container.layout().addWidget(buttonbox)

        self.setCentralWidget(container)

        self.stack = central

        # General Tab
        tab = QWidget()
        self.addTab(tab, self.tr("General"),
                    toolTip=self.tr("General Options"))

        form = QFormLayout()
        tab.setSizePolicy(QSizePolicy.Fixed, QSizePolicy.Fixed)

        nodes = QWidget(self, objectName="nodes")
        nodes.setLayout(QVBoxLayout())
        nodes.layout().setContentsMargins(0, 0, 0, 0)

        cb_anim = QCheckBox(
            self.tr("Enable node animations"),
            objectName="enable-node-animations",
            toolTip=self.tr("Enable shadow and ping animations for nodes "
                            "in the workflow.")
        )
        self.bind(cb_anim, "checked", "schemeedit/enable-node-animations")
        nodes.layout().addWidget(cb_anim)

        form.addRow(self.tr("Nodes"), nodes)

        links = QWidget(self, objectName="links")
        links.setLayout(QVBoxLayout())
        links.layout().setContentsMargins(0, 0, 0, 0)

        cb_show = QCheckBox(
            self.tr("Show channel names between widgets"),
            objectName="show-channel-names",
            toolTip=self.tr("Show source and sink channel names "
                            "over the links.")
        )

        self.bind(cb_show, "checked", "schemeedit/show-channel-names")

        links.layout().addWidget(cb_show)

        form.addRow(self.tr("Links"), links)

        quickmenu = QWidget(self, objectName="quickmenu-options")
        quickmenu.setLayout(QVBoxLayout())
        quickmenu.layout().setContentsMargins(0, 0, 0, 0)

        cb1 = QCheckBox(self.tr("On double click"),
                        toolTip=self.tr("Open quick menu on a double click "
                                        "on an empty spot in the canvas"))

        cb2 = QCheckBox(self.tr("On right click"),
                        toolTip=self.tr("Open quick menu on a right click "
                                        "on an empty spot in the canvas"))

        cb3 = QCheckBox(self.tr("On space key press"),
                        toolTip=self.tr("On Space key press while the mouse"
                                        "is hovering over the canvas."))

        cb4 = QCheckBox(self.tr("On any key press"),
                        toolTip=self.tr("On any key press while the mouse"
                                        "is hovering over the canvas."))

        self.bind(cb1, "checked", "quickmenu/trigger-on-double-click")
        self.bind(cb2, "checked", "quickmenu/trigger-on-right-click")
        self.bind(cb3, "checked", "quickmenu/trigger-on-space-key")
        self.bind(cb4, "checked", "quickmenu/trigger-on-any-key")
#.........这里部分代码省略.........