# coding: utf-8 # /*########################################################################## # # Copyright (c) 2018-2019 European Synchrotron Radiation Facility # # Permission is hereby granted, free of charge, to any person obtaining a copy # of this software and associated documentation files (the "Software"), to deal # in the Software without restriction, including without limitation the rights # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell # copies of the Software, and to permit persons to whom the Software is # furnished to do so, subject to the following conditions: # # The above copyright notice and this permission notice shall be included in # all copies or substantial portions of the Software. # # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN # THE SOFTWARE. # # ###########################################################################*/ """This module provides ROI interaction for :class:`~silx.gui.plot.PlotWidget`. """ __authors__ = ["T. Vincent"] __license__ = "MIT" __date__ = "28/06/2018" import collections import enum import functools import logging import time import weakref import numpy from ....utils.weakref import WeakMethodProxy from ... import qt, icons from .. import PlotWidget from ..items import roi as roi_items from ...colors import rgba logger = logging.getLogger(__name__) class RegionOfInterestManager(qt.QObject): """Class handling ROI interaction on a PlotWidget. It supports the multiple ROIs: points, rectangles, polygons, lines, horizontal and vertical lines. See ``plotInteractiveImageROI.py`` sample code (:ref:`sample-code`). :param silx.gui.plot.PlotWidget parent: The plot widget in which to control the ROIs. """ sigRoiAdded = qt.Signal(roi_items.RegionOfInterest) """Signal emitted when a new ROI has been added. It provides the newly add :class:`RegionOfInterest` object. """ sigRoiAboutToBeRemoved = qt.Signal(roi_items.RegionOfInterest) """Signal emitted just before a ROI is removed. It provides the :class:`RegionOfInterest` object that is about to be removed. """ sigRoiChanged = qt.Signal() """Signal emitted whenever the ROIs have changed.""" sigInteractiveModeStarted = qt.Signal(object) """Signal emitted when switching to ROI drawing interactive mode. It provides the class of the ROI which will be created by the interactive mode. """ sigInteractiveModeFinished = qt.Signal() """Signal emitted when leaving and interactive ROI drawing. It provides the list of ROIs. """ _MODE_ACTIONS_PARAMS = collections.OrderedDict() # Interactive mode: (icon name, text) _MODE_ACTIONS_PARAMS[roi_items.PointROI] = 'add-shape-point', 'Add point markers' _MODE_ACTIONS_PARAMS[roi_items.RectangleROI] = 'add-shape-rectangle', 'Add rectangle ROI' _MODE_ACTIONS_PARAMS[roi_items.PolygonROI] = 'add-shape-polygon', 'Add polygon ROI' _MODE_ACTIONS_PARAMS[roi_items.LineROI] = 'add-shape-diagonal', 'Add line ROI' _MODE_ACTIONS_PARAMS[roi_items.HorizontalLineROI] = 'add-shape-horizontal', 'Add horizontal line ROI' _MODE_ACTIONS_PARAMS[roi_items.VerticalLineROI] = 'add-shape-vertical', 'Add vertical line ROI' _MODE_ACTIONS_PARAMS[roi_items.ArcROI] = 'add-shape-arc', 'Add arc ROI' def __init__(self, parent): assert isinstance(parent, PlotWidget) super(RegionOfInterestManager, self).__init__(parent) self._rois = [] # List of ROIs self._drawnROI = None # New ROI being currently drawn self._roiClass = None self._color = rgba('red') self._label = "__RegionOfInterestManager__%d" % id(self) self._eventLoop = None self._modeActions = {} parent.sigInteractiveModeChanged.connect( self._plotInteractiveModeChanged) @classmethod def getSupportedRoiClasses(cls): """Returns the default available ROI classes :rtype: List[class] """ return tuple(cls._MODE_ACTIONS_PARAMS.keys()) # Associated QActions def getInteractionModeAction(self, roiClass): """Returns the QAction corresponding to a kind of ROI The QAction allows to enable the corresponding drawing interactive mode. :param str roiClass: The ROI class which will be crated by this action. :rtype: QAction :raise ValueError: If kind is not supported """ if not issubclass(roiClass, roi_items.RegionOfInterest): raise ValueError('Unsupported ROI class %s' % roiClass) action = self._modeActions.get(roiClass, None) if action is None: # Lazy-loading if roiClass in self._MODE_ACTIONS_PARAMS: iconName, text = self._MODE_ACTIONS_PARAMS[roiClass] else: iconName = "add-shape-unknown" name = roiClass._getKind() if name is None: name = roiClass.__name__ text = 'Add %s' % name action = qt.QAction(self) action.setIcon(icons.getQIcon(iconName)) action.setText(text) action.setCheckable(True) action.setChecked(self.getCurrentInteractionModeRoiClass() is roiClass) action.setToolTip(text) action.triggered[bool].connect(functools.partial( WeakMethodProxy(self._modeActionTriggered), roiClass=roiClass)) self._modeActions[roiClass] = action return action def _modeActionTriggered(self, checked, roiClass): """Handle mode actions being checked by the user :param bool checked: :param str kind: Corresponding shape kind """ if checked: self.start(roiClass) else: # Keep action checked action = self.sender() action.setChecked(True) def _updateModeActions(self): """Check/Uncheck action corresponding to current mode""" for roiClass, action in self._modeActions.items(): action.setChecked(roiClass == self.getCurrentInteractionModeRoiClass()) # PlotWidget eventFilter and listeners def _plotInteractiveModeChanged(self, source): """Handle change of interactive mode in the plot""" if source is not self: self.__roiInteractiveModeEnded() else: # Check the corresponding action self._updateModeActions() # Handle ROI interaction def _handleInteraction(self, event): """Handle mouse interaction for ROI addition""" roiClass = self.getCurrentInteractionModeRoiClass() if roiClass is None: return # Should not happen kind = roiClass.getFirstInteractionShape() if kind == 'point': if event['event'] == 'mouseClicked' and event['button'] == 'left': points = numpy.array([(event['x'], event['y'])], dtype=numpy.float64) self.createRoi(roiClass, points=points) else: # other shapes if (event['event'] in ('drawingProgress', 'drawingFinished') and event['parameters']['label'] == self._label): points = numpy.array((event['xdata'], event['ydata']), dtype=numpy.float64).T if self._drawnROI is None: # Create new ROI self._drawnROI = self.createRoi(roiClass, points=points) else: self._drawnROI.setFirstShapePoints(points) if event['event'] == 'drawingFinished': if kind == 'polygon' and len(points) > 1: self._drawnROI.setFirstShapePoints(points[:-1]) self._drawnROI = None # Stop drawing # RegionOfInterest API def getRois(self): """Returns the list of ROIs. It returns an empty tuple if there is currently no ROI. :return: Tuple of arrays of objects describing the ROIs :rtype: List[RegionOfInterest] """ return tuple(self._rois) def clear(self): """Reset current ROIs :return: True if ROIs were reset. :rtype: bool """ if self.getRois(): # Something to reset for roi in self._rois: roi.sigRegionChanged.disconnect( self._regionOfInterestChanged) roi.setParent(None) self._rois = [] self._roisUpdated() return True else: return False def _regionOfInterestChanged(self): """Handle ROI object changed""" self.sigRoiChanged.emit() def createRoi(self, roiClass, points, label='', index=None): """Create a new ROI and add it to list of ROIs. :param class roiClass: The class of the ROI to create :param numpy.ndarray points: The first shape used to create the ROI :param str label: The label to display along with the ROI. :param int index: The position where to insert the ROI. By default it is appended to the end of the list. :return: The created ROI object :rtype: roi_items.RegionOfInterest :raise RuntimeError: When ROI cannot be added because the maximum number of ROIs has been reached. """ roi = roiClass(parent=None) roi.setLabel(str(label)) roi.setFirstShapePoints(points) self.addRoi(roi, index) return roi def addRoi(self, roi, index=None, useManagerColor=True): """Add the ROI to the list of ROIs. :param roi_items.RegionOfInterest roi: The ROI to add :param int index: The position where to insert the ROI, By default it is appended to the end of the list of ROIs :raise RuntimeError: When ROI cannot be added because the maximum number of ROIs has been reached. """ plot = self.parent() if plot is None: raise RuntimeError( 'Cannot add ROI: PlotWidget no more available') roi.setParent(self) if useManagerColor: roi.setColor(self.getColor()) roi.sigRegionChanged.connect(self._regionOfInterestChanged) if index is None: self._rois.append(roi) else: self._rois.insert(index, roi) self.sigRoiAdded.emit(roi) self._roisUpdated() def removeRoi(self, roi): """Remove a ROI from the list of ROIs. :param roi_items.RegionOfInterest roi: The ROI to remove :raise ValueError: When ROI does not belong to this object """ if not (isinstance(roi, roi_items.RegionOfInterest) and roi.parent() is self and roi in self._rois): raise ValueError( 'RegionOfInterest does not belong to this instance') self.sigRoiAboutToBeRemoved.emit(roi) self._rois.remove(roi) roi.sigRegionChanged.disconnect(self._regionOfInterestChanged) roi.setParent(None) self._roisUpdated() def _roisUpdated(self): """Handle update of the ROI list""" self.sigRoiChanged.emit() # RegionOfInterest parameters def getColor(self): """Return the default color of created ROIs :rtype: QColor """ return qt.QColor.fromRgbF(*self._color) def setColor(self, color): """Set the default color to use when creating ROIs. Existing ROIs are not affected. :param color: The color to use for displaying ROIs as either a color name, a QColor, a list of uint8 or float in [0, 1]. """ self._color = rgba(color) # Control ROI def getCurrentInteractionModeRoiClass(self): """Returns the current ROI class used by the interactive drawing mode. Returns None if the ROI manager is not in an interactive mode. :rtype: Union[class,None] """ return self._roiClass def isStarted(self): """Returns True if an interactive ROI drawing mode is active. :rtype: bool """ return self._roiClass is not None def start(self, roiClass): """Start an interactive ROI drawing mode. :param class roiClass: The ROI class to create. It have to inherite from `roi_items.RegionOfInterest`. :return: True if interactive ROI drawing was started, False otherwise :rtype: bool :raise ValueError: If roiClass is not supported """ self.stop() if not issubclass(roiClass, roi_items.RegionOfInterest): raise ValueError('Unsupported ROI class %s' % roiClass) plot = self.parent() if plot is None: return False self._roiClass = roiClass firstInteractionShapeKind = roiClass.getFirstInteractionShape() if firstInteractionShapeKind == 'point': plot.setInteractiveMode(mode='select', source=self) else: if roiClass.showFirstInteractionShape(): color = rgba(self.getColor()) else: color = None plot.setInteractiveMode(mode='select-draw', source=self, shape=firstInteractionShapeKind, color=color, label=self._label) plot.sigPlotSignal.connect(self._handleInteraction) self.sigInteractiveModeStarted.emit(roiClass) return True def __roiInteractiveModeEnded(self): """Handle end of ROI draw interactive mode""" if self.isStarted(): self._roiClass = None if self._drawnROI is not None: # Cancel ROI create self.removeRoi(self._drawnROI) self._drawnROI = None plot = self.parent() if plot is not None: plot.sigPlotSignal.disconnect(self._handleInteraction) self._updateModeActions() self.sigInteractiveModeFinished.emit() def stop(self): """Stop interactive ROI drawing mode. :return: True if an interactive ROI drawing mode was actually stopped :rtype: bool """ if not self.isStarted(): return False plot = self.parent() if plot is not None: # This leads to call __roiInteractiveModeEnded through # interactive mode changed signal plot.setInteractiveMode(mode='zoom', source=None) else: # Fallback self.__roiInteractiveModeEnded() return True def exec_(self, roiClass): """Block until :meth:`quit` is called. :param class kind: The class of the ROI which have to be created. See `silx.gui.plot.items.roi`. :return: The list of ROIs :rtype: tuple """ self.start(roiClass) plot = self.parent() plot.show() plot.raise_() self._eventLoop = qt.QEventLoop() self._eventLoop.exec_() self._eventLoop = None self.stop() rois = self.getRois() self.clear() return rois def quit(self): """Stop a blocking :meth:`exec_` and call :meth:`stop`""" if self._eventLoop is not None: self._eventLoop.quit() self._eventLoop = None self.stop() class InteractiveRegionOfInterestManager(RegionOfInterestManager): """RegionOfInterestManager with features for use from interpreter. It is meant to be used through the :meth:`exec_`. It provides some messages to display in a status bar and different modes to end blocking calls to :meth:`exec_`. :param parent: See QObject """ sigMessageChanged = qt.Signal(str) """Signal emitted when a new message should be displayed to the user It provides the message as a str. """ def __init__(self, parent): super(InteractiveRegionOfInterestManager, self).__init__(parent) self._maxROI = None self.__timeoutEndTime = None self.__message = '' self.__validationMode = self.ValidationMode.ENTER self.__execClass = None self.sigRoiAdded.connect(self.__added) self.sigRoiAboutToBeRemoved.connect(self.__aboutToBeRemoved) self.sigInteractiveModeStarted.connect(self.__started) self.sigInteractiveModeFinished.connect(self.__finished) # Max ROI def getMaxRois(self): """Returns the maximum number of ROIs or None if no limit. :rtype: Union[int,None] """ return self._maxROI def setMaxRois(self, max_): """Set the maximum number of ROIs. :param Union[int,None] max_: The max limit or None for no limit. :raise ValueError: If there is more ROIs than max value """ if max_ is not None: max_ = int(max_) if max_ <= 0: raise ValueError('Max limit must be strictly positive') if len(self.getRois()) > max_: raise ValueError( 'Cannot set max limit: Already too many ROIs') self._maxROI = max_ def isMaxRois(self): """Returns True if the maximum number of ROIs is reached. :rtype: bool """ max_ = self.getMaxRois() return max_ is not None and len(self.getRois()) >= max_ # Validation mode @enum.unique class ValidationMode(enum.Enum): """Mode of validation to leave blocking :meth:`exec_`""" AUTO = 'auto' """Automatically ends the interactive mode once the user terminates the last ROI shape.""" ENTER = 'enter' """Ends the interactive mode when the *Enter* key is pressed.""" AUTO_ENTER = 'auto_enter' """Ends the interactive mode when reaching max ROIs or when the *Enter* key is pressed. """ NONE = 'none' """Do not provide the user a way to end the interactive mode. The end of :meth:`exec_` is done through :meth:`quit` or timeout. """ def getValidationMode(self): """Returns the interactive mode validation in use. :rtype: ValidationMode """ return self.__validationMode def setValidationMode(self, mode): """Set the way to perform interactive mode validation. See :class:`ValidationMode` enumeration for the supported validation modes. :param ValidationMode mode: The interactive mode validation to use. """ assert isinstance(mode, self.ValidationMode) if mode != self.__validationMode: self.__validationMode = mode if self.isExec(): if (self.isMaxRois() and self.getValidationMode() in (self.ValidationMode.AUTO, self.ValidationMode.AUTO_ENTER)): self.quit() self.__updateMessage() def eventFilter(self, obj, event): if event.type() == qt.QEvent.Hide: self.quit() if event.type() == qt.QEvent.KeyPress: key = event.key() if (key in (qt.Qt.Key_Return, qt.Qt.Key_Enter) and self.getValidationMode() in ( self.ValidationMode.ENTER, self.ValidationMode.AUTO_ENTER)): # Stop on return key pressed self.quit() return True # Stop further handling of this keys if (key in (qt.Qt.Key_Delete, qt.Qt.Key_Backspace) or ( key == qt.Qt.Key_Z and event.modifiers() & qt.Qt.ControlModifier)): rois = self.getRois() if rois: # Something to undo self.removeRoi(rois[-1]) # Stop further handling of keys if something was undone return True return super(InteractiveRegionOfInterestManager, self).eventFilter(obj, event) # Message API def getMessage(self): """Returns the current status message. This message is meant to be displayed in a status bar. :rtype: str """ if self.__timeoutEndTime is None: return self.__message else: remaining = self.__timeoutEndTime - time.time() return self.__message + (' - %d seconds remaining' % max(1, int(remaining))) # Listen to ROI updates def __added(self, *args, **kwargs): """Handle new ROI added""" max_ = self.getMaxRois() if max_ is not None: # When reaching max number of ROIs, redo last one while len(self.getRois()) > max_: self.removeRoi(self.getRois()[-2]) self.__updateMessage() if (self.isMaxRois() and self.getValidationMode() in (self.ValidationMode.AUTO, self.ValidationMode.AUTO_ENTER)): self.quit() def __aboutToBeRemoved(self, *args, **kwargs): """Handle removal of a ROI""" # RegionOfInterest not removed yet self.__updateMessage(nbrois=len(self.getRois()) - 1) def __started(self, roiKind): """Handle interactive mode started""" self.__updateMessage() def __finished(self): """Handle interactive mode finished""" self.__updateMessage() def __updateMessage(self, nbrois=None): """Update message""" if not self.isExec(): message = 'Done' elif not self.isStarted(): message = 'Use %s ROI edition mode' % self.__execClass else: if nbrois is None: nbrois = len(self.getRois()) kind = self.__execClass._getKind() max_ = self.getMaxRois() if max_ is None: message = 'Select %ss (%d selected)' % (kind, nbrois) elif max_ <= 1: message = 'Select a %s' % kind else: message = 'Select %d/%d %ss' % (nbrois, max_, kind) if (self.getValidationMode() == self.ValidationMode.ENTER and self.isMaxRois()): message += ' - Press Enter to confirm' if message != self.__message: self.__message = message # Use getMessage to add timeout message self.sigMessageChanged.emit(self.getMessage()) # Handle blocking call def __timeoutUpdate(self): """Handle update of timeout""" if (self.__timeoutEndTime is not None and (self.__timeoutEndTime - time.time()) > 0): self.sigMessageChanged.emit(self.getMessage()) else: # Stop interactive mode and message timer timer = self.sender() if timer is not None: timer.stop() self.__timeoutEndTime = None self.quit() def isExec(self): """Returns True if :meth:`exec_` is currently running. :rtype: bool""" return self.__execClass is not None def exec_(self, roiClass, timeout=0): """Block until ROI selection is done or timeout is elapsed. :meth:`quit` also ends this blocking call. :param class roiClass: The class of the ROI which have to be created. See `silx.gui.plot.items.roi`. :param int timeout: Maximum duration in seconds to block. Default: No timeout :return: The list of ROIs :rtype: List[RegionOfInterest] """ plot = self.parent() if plot is None: return self.__execClass = roiClass plot.installEventFilter(self) if timeout > 0: self.__timeoutEndTime = time.time() + timeout timer = qt.QTimer(self) timer.timeout.connect(self.__timeoutUpdate) timer.start(1000) rois = super(InteractiveRegionOfInterestManager, self).exec_(roiClass) timer.stop() self.__timeoutEndTime = None else: rois = super(InteractiveRegionOfInterestManager, self).exec_(roiClass) plot.removeEventFilter(self) self.__execClass = None self.__updateMessage() return rois class _DeleteRegionOfInterestToolButton(qt.QToolButton): """Tool button deleting a ROI object :param parent: See QWidget :param RegionOfInterest roi: The ROI to delete """ def __init__(self, parent, roi): super(_DeleteRegionOfInterestToolButton, self).__init__(parent) self.setIcon(icons.getQIcon('remove')) self.setToolTip("Remove this ROI") self.__roiRef = roi if roi is None else weakref.ref(roi) self.clicked.connect(self.__clicked) def __clicked(self, checked): """Handle button clicked""" roi = None if self.__roiRef is None else self.__roiRef() if roi is not None: manager = roi.parent() if manager is not None: manager.removeRoi(roi) self.__roiRef = None class RegionOfInterestTableWidget(qt.QTableWidget): """Widget displaying the ROIs of a :class:`RegionOfInterestManager`""" def __init__(self, parent=None): super(RegionOfInterestTableWidget, self).__init__(parent) self._roiManagerRef = None self.setColumnCount(5) self.setHorizontalHeaderLabels( ['Label', 'Edit', 'Kind', 'Coordinates', '']) horizontalHeader = self.horizontalHeader() horizontalHeader.setDefaultAlignment(qt.Qt.AlignLeft) if hasattr(horizontalHeader, 'setResizeMode'): # Qt 4 setSectionResizeMode = horizontalHeader.setResizeMode else: # Qt5 setSectionResizeMode = horizontalHeader.setSectionResizeMode setSectionResizeMode(0, qt.QHeaderView.Interactive) setSectionResizeMode(1, qt.QHeaderView.ResizeToContents) setSectionResizeMode(2, qt.QHeaderView.ResizeToContents) setSectionResizeMode(3, qt.QHeaderView.Stretch) setSectionResizeMode(4, qt.QHeaderView.ResizeToContents) verticalHeader = self.verticalHeader() verticalHeader.setVisible(False) self.setSelectionMode(qt.QAbstractItemView.NoSelection) self.setFocusPolicy(qt.Qt.NoFocus) self.itemChanged.connect(self.__itemChanged) def __itemChanged(self, item): """Handle item updates""" column = item.column() index = item.data(qt.Qt.UserRole) if index is not None: manager = self.getRegionOfInterestManager() roi = manager.getRois()[index] else: roi = None if column == 0: roi.setLabel(item.text()) elif column == 1: roi.setEditable( item.checkState() == qt.Qt.Checked) elif column in (2, 3, 4): pass # TODO else: logger.error('Unhandled column %d', column) def setRegionOfInterestManager(self, manager): """Set the :class:`RegionOfInterestManager` object to sync with :param RegionOfInterestManager manager: """ assert manager is None or isinstance(manager, RegionOfInterestManager) previousManager = self.getRegionOfInterestManager() if previousManager is not None: previousManager.sigRoiChanged.disconnect(self._sync) self.setRowCount(0) self._roiManagerRef = weakref.ref(manager) self._sync() if manager is not None: manager.sigRoiChanged.connect(self._sync) def _getReadableRoiDescription(self, roi): """Returns modelisation of a ROI as a readable sequence of values. :rtype: str """ text = str(roi) try: # Extract the params from syntax "CLASSNAME(PARAMS)" elements = text.split("(", 1) if len(elements) != 2: return text result = elements[1] result = result.strip() if not result.endswith(")"): return text result = result[0:-1] # Capitalize each words result = result.title() return result except Exception: logger.debug("Backtrace", exc_info=True) return text def _sync(self): """Update widget content according to ROI manger""" manager = self.getRegionOfInterestManager() if manager is None: self.setRowCount(0) return rois = manager.getRois() self.setRowCount(len(rois)) for index, roi in enumerate(rois): baseFlags = qt.Qt.ItemIsSelectable | qt.Qt.ItemIsEnabled # Label label = roi.getLabel() item = qt.QTableWidgetItem(label) item.setFlags(baseFlags | qt.Qt.ItemIsEditable) item.setData(qt.Qt.UserRole, index) self.setItem(index, 0, item) # Editable item = qt.QTableWidgetItem() item.setFlags(baseFlags | qt.Qt.ItemIsUserCheckable) item.setData(qt.Qt.UserRole, index) item.setCheckState( qt.Qt.Checked if roi.isEditable() else qt.Qt.Unchecked) self.setItem(index, 1, item) item.setTextAlignment(qt.Qt.AlignCenter) item.setText(None) # Kind label = roi._getKind() if label is None: # Default value if kind is not overrided label = roi.__class__.__name__ item = qt.QTableWidgetItem(label.capitalize()) item.setFlags(baseFlags) self.setItem(index, 2, item) item = qt.QTableWidgetItem() item.setFlags(baseFlags) # Coordinates text = self._getReadableRoiDescription(roi) item.setText(text) self.setItem(index, 3, item) # Delete delBtn = _DeleteRegionOfInterestToolButton(None, roi) widget = qt.QWidget(self) layout = qt.QHBoxLayout() layout.setContentsMargins(2, 2, 2, 2) layout.setSpacing(0) widget.setLayout(layout) layout.addStretch(1) layout.addWidget(delBtn) layout.addStretch(1) self.setCellWidget(index, 4, widget) def getRegionOfInterestManager(self): """Returns the :class:`RegionOfInterestManager` this widget supervise. It returns None if not sync with an :class:`RegionOfInterestManager`. :rtype: RegionOfInterestManager """ return None if self._roiManagerRef is None else self._roiManagerRef()