通过QDockWidget

# dock window project        self.projectdock = QtWidgets.QDockWidget(self.tr("Project"), self)        self.projectdock.setFeatures(QtWidgets.QDockWidget.DockWidgetMovable |                                     QtWidgets.QDockWidget.DockWidgetClosable |                                     QtWidgets.QDockWidget.DockWidgetFloatable)        self.projectdock.setAllowedAreas(            QtCore.Qt.LeftDockWidgetArea | QtCore.Qt.RightDockWidgetArea)        self.projModel = QtWidgets.QFileSystemModel()        self.projTree = QtWidgets.QTreeView()        self.projTree.setContextMenuPolicy(QtCore.Qt.CustomContextMenu)        self.projTree.customContextMenuRequested.connect(            self.projTree_contextmenu_handler)        self.projTree.setModel(self.projModel)        self.projTree.setColumnHidden(1, True)        self.projTree.setColumnHidden(2, True)        self.projTree.setColumnHidden(3, True)        self.projTree.setHeaderHidden(True)        # bind double click handler        self.projTree.doubleClicked.connect(            self.__tree_double_clicked_handler)        self.projectdock.setWidget(self.projTree)        self.projectdock.closeEvent = self.__projectdock_closeEvent_handler        self.addDockWidget(QtCore.Qt.LeftDockWidgetArea, self.projectdock)